1pub mod display_map;
   2mod element;
   3pub mod items;
   4pub mod movement;
   5mod multi_buffer;
   6
   7#[cfg(test)]
   8mod test;
   9
  10use aho_corasick::AhoCorasick;
  11use anyhow::Result;
  12use clock::ReplicaId;
  13use collections::{BTreeMap, Bound, HashMap, HashSet};
  14pub use display_map::DisplayPoint;
  15use display_map::*;
  16pub use element::*;
  17use fuzzy::{StringMatch, StringMatchCandidate};
  18use gpui::{
  19    action,
  20    color::Color,
  21    elements::*,
  22    executor,
  23    fonts::{self, HighlightStyle, TextStyle},
  24    geometry::vector::{vec2f, Vector2F},
  25    keymap::Binding,
  26    platform::CursorStyle,
  27    text_layout, AppContext, AsyncAppContext, ClipboardItem, Element, ElementBox, Entity,
  28    ModelHandle, MutableAppContext, RenderContext, Task, View, ViewContext, ViewHandle,
  29    WeakViewHandle,
  30};
  31use items::{BufferItemHandle, MultiBufferItemHandle};
  32use itertools::Itertools as _;
  33pub use language::{char_kind, CharKind};
  34use language::{
  35    BracketPair, Buffer, CodeAction, CodeLabel, Completion, Diagnostic, DiagnosticSeverity,
  36    Language, OffsetRangeExt, Point, Selection, SelectionGoal, TransactionId,
  37};
  38use multi_buffer::MultiBufferChunks;
  39pub use multi_buffer::{
  40    Anchor, AnchorRangeExt, ExcerptId, MultiBuffer, MultiBufferSnapshot, ToOffset, ToPoint,
  41};
  42use ordered_float::OrderedFloat;
  43use postage::watch;
  44use project::{Project, ProjectTransaction};
  45use serde::{Deserialize, Serialize};
  46use smallvec::SmallVec;
  47use smol::Timer;
  48use snippet::Snippet;
  49use std::{
  50    any::TypeId,
  51    cmp::{self, Ordering, Reverse},
  52    iter::{self, FromIterator},
  53    mem,
  54    ops::{Deref, DerefMut, Range, RangeInclusive, Sub},
  55    sync::Arc,
  56    time::{Duration, Instant},
  57};
  58pub use sum_tree::Bias;
  59use text::rope::TextDimension;
  60use theme::DiagnosticStyle;
  61use util::{post_inc, ResultExt, TryFutureExt};
  62use workspace::{settings, ItemNavHistory, PathOpener, Settings, Workspace};
  63
  64const CURSOR_BLINK_INTERVAL: Duration = Duration::from_millis(500);
  65const MAX_LINE_LEN: usize = 1024;
  66const MIN_NAVIGATION_HISTORY_ROW_DELTA: i64 = 10;
  67
  68action!(Cancel);
  69action!(Backspace);
  70action!(Delete);
  71action!(Input, String);
  72action!(Newline);
  73action!(Tab);
  74action!(Outdent);
  75action!(DeleteLine);
  76action!(DeleteToPreviousWordBoundary);
  77action!(DeleteToNextWordBoundary);
  78action!(DeleteToBeginningOfLine);
  79action!(DeleteToEndOfLine);
  80action!(CutToEndOfLine);
  81action!(DuplicateLine);
  82action!(MoveLineUp);
  83action!(MoveLineDown);
  84action!(Cut);
  85action!(Copy);
  86action!(Paste);
  87action!(Undo);
  88action!(Redo);
  89action!(MoveUp);
  90action!(MoveDown);
  91action!(MoveLeft);
  92action!(MoveRight);
  93action!(MoveToPreviousWordBoundary);
  94action!(MoveToNextWordBoundary);
  95action!(MoveToBeginningOfLine);
  96action!(MoveToEndOfLine);
  97action!(MoveToBeginning);
  98action!(MoveToEnd);
  99action!(SelectUp);
 100action!(SelectDown);
 101action!(SelectLeft);
 102action!(SelectRight);
 103action!(SelectToPreviousWordBoundary);
 104action!(SelectToNextWordBoundary);
 105action!(SelectToBeginningOfLine, bool);
 106action!(SelectToEndOfLine, bool);
 107action!(SelectToBeginning);
 108action!(SelectToEnd);
 109action!(SelectAll);
 110action!(SelectLine);
 111action!(SplitSelectionIntoLines);
 112action!(AddSelectionAbove);
 113action!(AddSelectionBelow);
 114action!(SelectNext, bool);
 115action!(ToggleComments);
 116action!(SelectLargerSyntaxNode);
 117action!(SelectSmallerSyntaxNode);
 118action!(MoveToEnclosingBracket);
 119action!(ShowNextDiagnostic);
 120action!(GoToDefinition);
 121action!(FindAllReferences);
 122action!(Rename);
 123action!(ConfirmRename);
 124action!(PageUp);
 125action!(PageDown);
 126action!(Fold);
 127action!(Unfold);
 128action!(FoldSelectedRanges);
 129action!(Scroll, Vector2F);
 130action!(Select, SelectPhase);
 131action!(ShowCompletions);
 132action!(ToggleCodeActions, bool);
 133action!(ConfirmCompletion, Option<usize>);
 134action!(ConfirmCodeAction, Option<usize>);
 135action!(OpenExcerpts);
 136
 137enum DocumentHighlightRead {}
 138enum DocumentHighlightWrite {}
 139
 140pub fn init(cx: &mut MutableAppContext, path_openers: &mut Vec<Box<dyn PathOpener>>) {
 141    path_openers.push(Box::new(items::BufferOpener));
 142    cx.add_bindings(vec![
 143        Binding::new("escape", Cancel, Some("Editor")),
 144        Binding::new("backspace", Backspace, Some("Editor")),
 145        Binding::new("ctrl-h", Backspace, Some("Editor")),
 146        Binding::new("delete", Delete, Some("Editor")),
 147        Binding::new("ctrl-d", Delete, Some("Editor")),
 148        Binding::new("enter", Newline, Some("Editor && mode == full")),
 149        Binding::new(
 150            "alt-enter",
 151            Input("\n".into()),
 152            Some("Editor && mode == auto_height"),
 153        ),
 154        Binding::new(
 155            "enter",
 156            ConfirmCompletion(None),
 157            Some("Editor && showing_completions"),
 158        ),
 159        Binding::new(
 160            "enter",
 161            ConfirmCodeAction(None),
 162            Some("Editor && showing_code_actions"),
 163        ),
 164        Binding::new("enter", ConfirmRename, Some("Editor && renaming")),
 165        Binding::new("tab", Tab, Some("Editor")),
 166        Binding::new(
 167            "tab",
 168            ConfirmCompletion(None),
 169            Some("Editor && showing_completions"),
 170        ),
 171        Binding::new("shift-tab", Outdent, Some("Editor")),
 172        Binding::new("ctrl-shift-K", DeleteLine, Some("Editor")),
 173        Binding::new(
 174            "alt-backspace",
 175            DeleteToPreviousWordBoundary,
 176            Some("Editor"),
 177        ),
 178        Binding::new("alt-h", DeleteToPreviousWordBoundary, Some("Editor")),
 179        Binding::new("alt-delete", DeleteToNextWordBoundary, Some("Editor")),
 180        Binding::new("alt-d", DeleteToNextWordBoundary, Some("Editor")),
 181        Binding::new("cmd-backspace", DeleteToBeginningOfLine, Some("Editor")),
 182        Binding::new("cmd-delete", DeleteToEndOfLine, Some("Editor")),
 183        Binding::new("ctrl-k", CutToEndOfLine, Some("Editor")),
 184        Binding::new("cmd-shift-D", DuplicateLine, Some("Editor")),
 185        Binding::new("ctrl-cmd-up", MoveLineUp, Some("Editor")),
 186        Binding::new("ctrl-cmd-down", MoveLineDown, Some("Editor")),
 187        Binding::new("cmd-x", Cut, Some("Editor")),
 188        Binding::new("cmd-c", Copy, Some("Editor")),
 189        Binding::new("cmd-v", Paste, Some("Editor")),
 190        Binding::new("cmd-z", Undo, Some("Editor")),
 191        Binding::new("cmd-shift-Z", Redo, Some("Editor")),
 192        Binding::new("up", MoveUp, Some("Editor")),
 193        Binding::new("down", MoveDown, Some("Editor")),
 194        Binding::new("left", MoveLeft, Some("Editor")),
 195        Binding::new("right", MoveRight, Some("Editor")),
 196        Binding::new("ctrl-p", MoveUp, Some("Editor")),
 197        Binding::new("ctrl-n", MoveDown, Some("Editor")),
 198        Binding::new("ctrl-b", MoveLeft, Some("Editor")),
 199        Binding::new("ctrl-f", MoveRight, Some("Editor")),
 200        Binding::new("alt-left", MoveToPreviousWordBoundary, Some("Editor")),
 201        Binding::new("alt-b", MoveToPreviousWordBoundary, Some("Editor")),
 202        Binding::new("alt-right", MoveToNextWordBoundary, Some("Editor")),
 203        Binding::new("alt-f", MoveToNextWordBoundary, Some("Editor")),
 204        Binding::new("cmd-left", MoveToBeginningOfLine, Some("Editor")),
 205        Binding::new("ctrl-a", MoveToBeginningOfLine, Some("Editor")),
 206        Binding::new("cmd-right", MoveToEndOfLine, Some("Editor")),
 207        Binding::new("ctrl-e", MoveToEndOfLine, Some("Editor")),
 208        Binding::new("cmd-up", MoveToBeginning, Some("Editor")),
 209        Binding::new("cmd-down", MoveToEnd, Some("Editor")),
 210        Binding::new("shift-up", SelectUp, Some("Editor")),
 211        Binding::new("ctrl-shift-P", SelectUp, Some("Editor")),
 212        Binding::new("shift-down", SelectDown, Some("Editor")),
 213        Binding::new("ctrl-shift-N", SelectDown, Some("Editor")),
 214        Binding::new("shift-left", SelectLeft, Some("Editor")),
 215        Binding::new("ctrl-shift-B", SelectLeft, Some("Editor")),
 216        Binding::new("shift-right", SelectRight, Some("Editor")),
 217        Binding::new("ctrl-shift-F", SelectRight, Some("Editor")),
 218        Binding::new(
 219            "alt-shift-left",
 220            SelectToPreviousWordBoundary,
 221            Some("Editor"),
 222        ),
 223        Binding::new("alt-shift-B", SelectToPreviousWordBoundary, Some("Editor")),
 224        Binding::new("alt-shift-right", SelectToNextWordBoundary, Some("Editor")),
 225        Binding::new("alt-shift-F", SelectToNextWordBoundary, Some("Editor")),
 226        Binding::new(
 227            "cmd-shift-left",
 228            SelectToBeginningOfLine(true),
 229            Some("Editor"),
 230        ),
 231        Binding::new(
 232            "ctrl-shift-A",
 233            SelectToBeginningOfLine(true),
 234            Some("Editor"),
 235        ),
 236        Binding::new("cmd-shift-right", SelectToEndOfLine(true), Some("Editor")),
 237        Binding::new("ctrl-shift-E", SelectToEndOfLine(true), Some("Editor")),
 238        Binding::new("cmd-shift-up", SelectToBeginning, Some("Editor")),
 239        Binding::new("cmd-shift-down", SelectToEnd, Some("Editor")),
 240        Binding::new("cmd-a", SelectAll, Some("Editor")),
 241        Binding::new("cmd-l", SelectLine, Some("Editor")),
 242        Binding::new("cmd-shift-L", SplitSelectionIntoLines, Some("Editor")),
 243        Binding::new("cmd-alt-up", AddSelectionAbove, Some("Editor")),
 244        Binding::new("cmd-ctrl-p", AddSelectionAbove, Some("Editor")),
 245        Binding::new("cmd-alt-down", AddSelectionBelow, Some("Editor")),
 246        Binding::new("cmd-ctrl-n", AddSelectionBelow, Some("Editor")),
 247        Binding::new("cmd-d", SelectNext(false), Some("Editor")),
 248        Binding::new("cmd-k cmd-d", SelectNext(true), Some("Editor")),
 249        Binding::new("cmd-/", ToggleComments, Some("Editor")),
 250        Binding::new("alt-up", SelectLargerSyntaxNode, Some("Editor")),
 251        Binding::new("ctrl-w", SelectLargerSyntaxNode, Some("Editor")),
 252        Binding::new("alt-down", SelectSmallerSyntaxNode, Some("Editor")),
 253        Binding::new("ctrl-shift-W", SelectSmallerSyntaxNode, Some("Editor")),
 254        Binding::new("f8", ShowNextDiagnostic, Some("Editor")),
 255        Binding::new("f2", Rename, Some("Editor")),
 256        Binding::new("f12", GoToDefinition, Some("Editor")),
 257        Binding::new("alt-shift-f12", FindAllReferences, Some("Editor")),
 258        Binding::new("ctrl-m", MoveToEnclosingBracket, Some("Editor")),
 259        Binding::new("pageup", PageUp, Some("Editor")),
 260        Binding::new("pagedown", PageDown, Some("Editor")),
 261        Binding::new("alt-cmd-[", Fold, Some("Editor")),
 262        Binding::new("alt-cmd-]", Unfold, Some("Editor")),
 263        Binding::new("alt-cmd-f", FoldSelectedRanges, Some("Editor")),
 264        Binding::new("ctrl-space", ShowCompletions, Some("Editor")),
 265        Binding::new("cmd-.", ToggleCodeActions(false), Some("Editor")),
 266        Binding::new("alt-enter", OpenExcerpts, Some("Editor")),
 267    ]);
 268
 269    cx.add_action(Editor::open_new);
 270    cx.add_action(|this: &mut Editor, action: &Scroll, cx| this.set_scroll_position(action.0, cx));
 271    cx.add_action(Editor::select);
 272    cx.add_action(Editor::cancel);
 273    cx.add_action(Editor::handle_input);
 274    cx.add_action(Editor::newline);
 275    cx.add_action(Editor::backspace);
 276    cx.add_action(Editor::delete);
 277    cx.add_action(Editor::tab);
 278    cx.add_action(Editor::outdent);
 279    cx.add_action(Editor::delete_line);
 280    cx.add_action(Editor::delete_to_previous_word_boundary);
 281    cx.add_action(Editor::delete_to_next_word_boundary);
 282    cx.add_action(Editor::delete_to_beginning_of_line);
 283    cx.add_action(Editor::delete_to_end_of_line);
 284    cx.add_action(Editor::cut_to_end_of_line);
 285    cx.add_action(Editor::duplicate_line);
 286    cx.add_action(Editor::move_line_up);
 287    cx.add_action(Editor::move_line_down);
 288    cx.add_action(Editor::cut);
 289    cx.add_action(Editor::copy);
 290    cx.add_action(Editor::paste);
 291    cx.add_action(Editor::undo);
 292    cx.add_action(Editor::redo);
 293    cx.add_action(Editor::move_up);
 294    cx.add_action(Editor::move_down);
 295    cx.add_action(Editor::move_left);
 296    cx.add_action(Editor::move_right);
 297    cx.add_action(Editor::move_to_previous_word_boundary);
 298    cx.add_action(Editor::move_to_next_word_boundary);
 299    cx.add_action(Editor::move_to_beginning_of_line);
 300    cx.add_action(Editor::move_to_end_of_line);
 301    cx.add_action(Editor::move_to_beginning);
 302    cx.add_action(Editor::move_to_end);
 303    cx.add_action(Editor::select_up);
 304    cx.add_action(Editor::select_down);
 305    cx.add_action(Editor::select_left);
 306    cx.add_action(Editor::select_right);
 307    cx.add_action(Editor::select_to_previous_word_boundary);
 308    cx.add_action(Editor::select_to_next_word_boundary);
 309    cx.add_action(Editor::select_to_beginning_of_line);
 310    cx.add_action(Editor::select_to_end_of_line);
 311    cx.add_action(Editor::select_to_beginning);
 312    cx.add_action(Editor::select_to_end);
 313    cx.add_action(Editor::select_all);
 314    cx.add_action(Editor::select_line);
 315    cx.add_action(Editor::split_selection_into_lines);
 316    cx.add_action(Editor::add_selection_above);
 317    cx.add_action(Editor::add_selection_below);
 318    cx.add_action(Editor::select_next);
 319    cx.add_action(Editor::toggle_comments);
 320    cx.add_action(Editor::select_larger_syntax_node);
 321    cx.add_action(Editor::select_smaller_syntax_node);
 322    cx.add_action(Editor::move_to_enclosing_bracket);
 323    cx.add_action(Editor::show_next_diagnostic);
 324    cx.add_action(Editor::go_to_definition);
 325    cx.add_action(Editor::page_up);
 326    cx.add_action(Editor::page_down);
 327    cx.add_action(Editor::fold);
 328    cx.add_action(Editor::unfold);
 329    cx.add_action(Editor::fold_selected_ranges);
 330    cx.add_action(Editor::show_completions);
 331    cx.add_action(Editor::toggle_code_actions);
 332    cx.add_action(Editor::open_excerpts);
 333    cx.add_async_action(Editor::confirm_completion);
 334    cx.add_async_action(Editor::confirm_code_action);
 335    cx.add_async_action(Editor::rename);
 336    cx.add_async_action(Editor::confirm_rename);
 337    cx.add_async_action(Editor::find_all_references);
 338}
 339
 340trait SelectionExt {
 341    fn offset_range(&self, buffer: &MultiBufferSnapshot) -> Range<usize>;
 342    fn point_range(&self, buffer: &MultiBufferSnapshot) -> Range<Point>;
 343    fn display_range(&self, map: &DisplaySnapshot) -> Range<DisplayPoint>;
 344    fn spanned_rows(&self, include_end_if_at_line_start: bool, map: &DisplaySnapshot)
 345        -> Range<u32>;
 346}
 347
 348trait InvalidationRegion {
 349    fn ranges(&self) -> &[Range<Anchor>];
 350}
 351
 352#[derive(Clone, Debug)]
 353pub enum SelectPhase {
 354    Begin {
 355        position: DisplayPoint,
 356        add: bool,
 357        click_count: usize,
 358    },
 359    BeginColumnar {
 360        position: DisplayPoint,
 361        overshoot: u32,
 362    },
 363    Extend {
 364        position: DisplayPoint,
 365        click_count: usize,
 366    },
 367    Update {
 368        position: DisplayPoint,
 369        overshoot: u32,
 370        scroll_position: Vector2F,
 371    },
 372    End,
 373}
 374
 375#[derive(Clone, Debug)]
 376pub enum SelectMode {
 377    Character,
 378    Word(Range<Anchor>),
 379    Line(Range<Anchor>),
 380    All,
 381}
 382
 383#[derive(PartialEq, Eq)]
 384pub enum Autoscroll {
 385    Fit,
 386    Center,
 387    Newest,
 388}
 389
 390#[derive(Copy, Clone, PartialEq, Eq)]
 391pub enum EditorMode {
 392    SingleLine,
 393    AutoHeight { max_lines: usize },
 394    Full,
 395}
 396
 397#[derive(Clone)]
 398pub enum SoftWrap {
 399    None,
 400    EditorWidth,
 401    Column(u32),
 402}
 403
 404#[derive(Clone)]
 405pub struct EditorStyle {
 406    pub text: TextStyle,
 407    pub placeholder_text: Option<TextStyle>,
 408    pub theme: theme::Editor,
 409}
 410
 411type CompletionId = usize;
 412
 413pub type GetFieldEditorTheme = fn(&theme::Theme) -> theme::FieldEditor;
 414
 415type OverrideTextStyle = dyn Fn(&EditorStyle) -> Option<HighlightStyle>;
 416
 417pub struct Editor {
 418    handle: WeakViewHandle<Self>,
 419    buffer: ModelHandle<MultiBuffer>,
 420    display_map: ModelHandle<DisplayMap>,
 421    next_selection_id: usize,
 422    selections: Arc<[Selection<Anchor>]>,
 423    pending_selection: Option<PendingSelection>,
 424    columnar_selection_tail: Option<Anchor>,
 425    add_selections_state: Option<AddSelectionsState>,
 426    select_next_state: Option<SelectNextState>,
 427    selection_history:
 428        HashMap<TransactionId, (Arc<[Selection<Anchor>]>, Option<Arc<[Selection<Anchor>]>>)>,
 429    autoclose_stack: InvalidationStack<BracketPairState>,
 430    snippet_stack: InvalidationStack<SnippetState>,
 431    select_larger_syntax_node_stack: Vec<Box<[Selection<usize>]>>,
 432    active_diagnostics: Option<ActiveDiagnosticGroup>,
 433    scroll_position: Vector2F,
 434    scroll_top_anchor: Option<Anchor>,
 435    autoscroll_request: Option<Autoscroll>,
 436    settings: watch::Receiver<Settings>,
 437    soft_wrap_mode_override: Option<settings::SoftWrap>,
 438    get_field_editor_theme: Option<GetFieldEditorTheme>,
 439    override_text_style: Option<Box<OverrideTextStyle>>,
 440    project: Option<ModelHandle<Project>>,
 441    focused: bool,
 442    show_local_cursors: bool,
 443    show_local_selections: bool,
 444    blink_epoch: usize,
 445    blinking_paused: bool,
 446    mode: EditorMode,
 447    vertical_scroll_margin: f32,
 448    placeholder_text: Option<Arc<str>>,
 449    highlighted_rows: Option<Range<u32>>,
 450    background_highlights: BTreeMap<TypeId, (Color, Vec<Range<Anchor>>)>,
 451    nav_history: Option<ItemNavHistory>,
 452    context_menu: Option<ContextMenu>,
 453    completion_tasks: Vec<(CompletionId, Task<Option<()>>)>,
 454    next_completion_id: CompletionId,
 455    available_code_actions: Option<(ModelHandle<Buffer>, Arc<[CodeAction]>)>,
 456    code_actions_task: Option<Task<()>>,
 457    document_highlights_task: Option<Task<()>>,
 458    pending_rename: Option<RenameState>,
 459    searchable: bool,
 460    cursor_shape: CursorShape,
 461}
 462
 463pub struct EditorSnapshot {
 464    pub mode: EditorMode,
 465    pub display_snapshot: DisplaySnapshot,
 466    pub placeholder_text: Option<Arc<str>>,
 467    is_focused: bool,
 468    scroll_position: Vector2F,
 469    scroll_top_anchor: Option<Anchor>,
 470}
 471
 472#[derive(Clone)]
 473pub struct PendingSelection {
 474    selection: Selection<Anchor>,
 475    mode: SelectMode,
 476}
 477
 478struct AddSelectionsState {
 479    above: bool,
 480    stack: Vec<usize>,
 481}
 482
 483struct SelectNextState {
 484    query: AhoCorasick,
 485    wordwise: bool,
 486    done: bool,
 487}
 488
 489struct BracketPairState {
 490    ranges: Vec<Range<Anchor>>,
 491    pair: BracketPair,
 492}
 493
 494struct SnippetState {
 495    ranges: Vec<Vec<Range<Anchor>>>,
 496    active_index: usize,
 497}
 498
 499pub struct RenameState {
 500    pub range: Range<Anchor>,
 501    pub old_name: String,
 502    pub editor: ViewHandle<Editor>,
 503    block_id: BlockId,
 504}
 505
 506struct InvalidationStack<T>(Vec<T>);
 507
 508enum ContextMenu {
 509    Completions(CompletionsMenu),
 510    CodeActions(CodeActionsMenu),
 511}
 512
 513impl ContextMenu {
 514    fn select_prev(&mut self, cx: &mut ViewContext<Editor>) -> bool {
 515        if self.visible() {
 516            match self {
 517                ContextMenu::Completions(menu) => menu.select_prev(cx),
 518                ContextMenu::CodeActions(menu) => menu.select_prev(cx),
 519            }
 520            true
 521        } else {
 522            false
 523        }
 524    }
 525
 526    fn select_next(&mut self, cx: &mut ViewContext<Editor>) -> bool {
 527        if self.visible() {
 528            match self {
 529                ContextMenu::Completions(menu) => menu.select_next(cx),
 530                ContextMenu::CodeActions(menu) => menu.select_next(cx),
 531            }
 532            true
 533        } else {
 534            false
 535        }
 536    }
 537
 538    fn visible(&self) -> bool {
 539        match self {
 540            ContextMenu::Completions(menu) => menu.visible(),
 541            ContextMenu::CodeActions(menu) => menu.visible(),
 542        }
 543    }
 544
 545    fn render(
 546        &self,
 547        cursor_position: DisplayPoint,
 548        style: EditorStyle,
 549        cx: &AppContext,
 550    ) -> (DisplayPoint, ElementBox) {
 551        match self {
 552            ContextMenu::Completions(menu) => (cursor_position, menu.render(style, cx)),
 553            ContextMenu::CodeActions(menu) => menu.render(cursor_position, style),
 554        }
 555    }
 556}
 557
 558struct CompletionsMenu {
 559    id: CompletionId,
 560    initial_position: Anchor,
 561    buffer: ModelHandle<Buffer>,
 562    completions: Arc<[Completion]>,
 563    match_candidates: Vec<StringMatchCandidate>,
 564    matches: Arc<[StringMatch]>,
 565    selected_item: usize,
 566    list: UniformListState,
 567}
 568
 569impl CompletionsMenu {
 570    fn select_prev(&mut self, cx: &mut ViewContext<Editor>) {
 571        if self.selected_item > 0 {
 572            self.selected_item -= 1;
 573            self.list.scroll_to(ScrollTarget::Show(self.selected_item));
 574        }
 575        cx.notify();
 576    }
 577
 578    fn select_next(&mut self, cx: &mut ViewContext<Editor>) {
 579        if self.selected_item + 1 < self.matches.len() {
 580            self.selected_item += 1;
 581            self.list.scroll_to(ScrollTarget::Show(self.selected_item));
 582        }
 583        cx.notify();
 584    }
 585
 586    fn visible(&self) -> bool {
 587        !self.matches.is_empty()
 588    }
 589
 590    fn render(&self, style: EditorStyle, _: &AppContext) -> ElementBox {
 591        enum CompletionTag {}
 592
 593        let completions = self.completions.clone();
 594        let matches = self.matches.clone();
 595        let selected_item = self.selected_item;
 596        let container_style = style.autocomplete.container;
 597        UniformList::new(self.list.clone(), matches.len(), move |range, items, cx| {
 598            let start_ix = range.start;
 599            for (ix, mat) in matches[range].iter().enumerate() {
 600                let completion = &completions[mat.candidate_id];
 601                let item_ix = start_ix + ix;
 602                items.push(
 603                    MouseEventHandler::new::<CompletionTag, _, _>(
 604                        mat.candidate_id,
 605                        cx,
 606                        |state, _| {
 607                            let item_style = if item_ix == selected_item {
 608                                style.autocomplete.selected_item
 609                            } else if state.hovered {
 610                                style.autocomplete.hovered_item
 611                            } else {
 612                                style.autocomplete.item
 613                            };
 614
 615                            Text::new(completion.label.text.clone(), style.text.clone())
 616                                .with_soft_wrap(false)
 617                                .with_highlights(combine_syntax_and_fuzzy_match_highlights(
 618                                    &completion.label.text,
 619                                    style.text.color.into(),
 620                                    styled_runs_for_code_label(
 621                                        &completion.label,
 622                                        style.text.color,
 623                                        &style.syntax,
 624                                    ),
 625                                    &mat.positions,
 626                                ))
 627                                .contained()
 628                                .with_style(item_style)
 629                                .boxed()
 630                        },
 631                    )
 632                    .with_cursor_style(CursorStyle::PointingHand)
 633                    .on_mouse_down(move |cx| {
 634                        cx.dispatch_action(ConfirmCompletion(Some(item_ix)));
 635                    })
 636                    .boxed(),
 637                );
 638            }
 639        })
 640        .with_width_from_item(
 641            self.matches
 642                .iter()
 643                .enumerate()
 644                .max_by_key(|(_, mat)| {
 645                    self.completions[mat.candidate_id]
 646                        .label
 647                        .text
 648                        .chars()
 649                        .count()
 650                })
 651                .map(|(ix, _)| ix),
 652        )
 653        .contained()
 654        .with_style(container_style)
 655        .boxed()
 656    }
 657
 658    pub async fn filter(&mut self, query: Option<&str>, executor: Arc<executor::Background>) {
 659        let mut matches = if let Some(query) = query {
 660            fuzzy::match_strings(
 661                &self.match_candidates,
 662                query,
 663                false,
 664                100,
 665                &Default::default(),
 666                executor,
 667            )
 668            .await
 669        } else {
 670            self.match_candidates
 671                .iter()
 672                .enumerate()
 673                .map(|(candidate_id, candidate)| StringMatch {
 674                    candidate_id,
 675                    score: Default::default(),
 676                    positions: Default::default(),
 677                    string: candidate.string.clone(),
 678                })
 679                .collect()
 680        };
 681        matches.sort_unstable_by_key(|mat| {
 682            (
 683                Reverse(OrderedFloat(mat.score)),
 684                self.completions[mat.candidate_id].sort_key(),
 685            )
 686        });
 687
 688        for mat in &mut matches {
 689            let filter_start = self.completions[mat.candidate_id].label.filter_range.start;
 690            for position in &mut mat.positions {
 691                *position += filter_start;
 692            }
 693        }
 694
 695        self.matches = matches.into();
 696    }
 697}
 698
 699#[derive(Clone)]
 700struct CodeActionsMenu {
 701    actions: Arc<[CodeAction]>,
 702    buffer: ModelHandle<Buffer>,
 703    selected_item: usize,
 704    list: UniformListState,
 705    deployed_from_indicator: bool,
 706}
 707
 708impl CodeActionsMenu {
 709    fn select_prev(&mut self, cx: &mut ViewContext<Editor>) {
 710        if self.selected_item > 0 {
 711            self.selected_item -= 1;
 712            cx.notify()
 713        }
 714    }
 715
 716    fn select_next(&mut self, cx: &mut ViewContext<Editor>) {
 717        if self.selected_item + 1 < self.actions.len() {
 718            self.selected_item += 1;
 719            cx.notify()
 720        }
 721    }
 722
 723    fn visible(&self) -> bool {
 724        !self.actions.is_empty()
 725    }
 726
 727    fn render(
 728        &self,
 729        mut cursor_position: DisplayPoint,
 730        style: EditorStyle,
 731    ) -> (DisplayPoint, ElementBox) {
 732        enum ActionTag {}
 733
 734        let container_style = style.autocomplete.container;
 735        let actions = self.actions.clone();
 736        let selected_item = self.selected_item;
 737        let element =
 738            UniformList::new(self.list.clone(), actions.len(), move |range, items, cx| {
 739                let start_ix = range.start;
 740                for (ix, action) in actions[range].iter().enumerate() {
 741                    let item_ix = start_ix + ix;
 742                    items.push(
 743                        MouseEventHandler::new::<ActionTag, _, _>(item_ix, cx, |state, _| {
 744                            let item_style = if item_ix == selected_item {
 745                                style.autocomplete.selected_item
 746                            } else if state.hovered {
 747                                style.autocomplete.hovered_item
 748                            } else {
 749                                style.autocomplete.item
 750                            };
 751
 752                            Text::new(action.lsp_action.title.clone(), style.text.clone())
 753                                .with_soft_wrap(false)
 754                                .contained()
 755                                .with_style(item_style)
 756                                .boxed()
 757                        })
 758                        .with_cursor_style(CursorStyle::PointingHand)
 759                        .on_mouse_down(move |cx| {
 760                            cx.dispatch_action(ConfirmCodeAction(Some(item_ix)));
 761                        })
 762                        .boxed(),
 763                    );
 764                }
 765            })
 766            .with_width_from_item(
 767                self.actions
 768                    .iter()
 769                    .enumerate()
 770                    .max_by_key(|(_, action)| action.lsp_action.title.chars().count())
 771                    .map(|(ix, _)| ix),
 772            )
 773            .contained()
 774            .with_style(container_style)
 775            .boxed();
 776
 777        if self.deployed_from_indicator {
 778            *cursor_position.column_mut() = 0;
 779        }
 780
 781        (cursor_position, element)
 782    }
 783}
 784
 785#[derive(Debug)]
 786struct ActiveDiagnosticGroup {
 787    primary_range: Range<Anchor>,
 788    primary_message: String,
 789    blocks: HashMap<BlockId, Diagnostic>,
 790    is_valid: bool,
 791}
 792
 793#[derive(Serialize, Deserialize)]
 794struct ClipboardSelection {
 795    len: usize,
 796    is_entire_line: bool,
 797}
 798
 799pub struct NavigationData {
 800    anchor: Anchor,
 801    offset: usize,
 802}
 803
 804impl Editor {
 805    pub fn single_line(
 806        settings: watch::Receiver<Settings>,
 807        field_editor_style: Option<GetFieldEditorTheme>,
 808        cx: &mut ViewContext<Self>,
 809    ) -> Self {
 810        let buffer = cx.add_model(|cx| Buffer::new(0, String::new(), cx));
 811        let buffer = cx.add_model(|cx| MultiBuffer::singleton(buffer, cx));
 812        Self::new(
 813            EditorMode::SingleLine,
 814            buffer,
 815            None,
 816            settings,
 817            field_editor_style,
 818            cx,
 819        )
 820    }
 821
 822    pub fn auto_height(
 823        max_lines: usize,
 824        settings: watch::Receiver<Settings>,
 825        field_editor_style: Option<GetFieldEditorTheme>,
 826        cx: &mut ViewContext<Self>,
 827    ) -> Self {
 828        let buffer = cx.add_model(|cx| Buffer::new(0, String::new(), cx));
 829        let buffer = cx.add_model(|cx| MultiBuffer::singleton(buffer, cx));
 830        Self::new(
 831            EditorMode::AutoHeight { max_lines },
 832            buffer,
 833            None,
 834            settings,
 835            field_editor_style,
 836            cx,
 837        )
 838    }
 839
 840    pub fn for_buffer(
 841        buffer: ModelHandle<MultiBuffer>,
 842        project: Option<ModelHandle<Project>>,
 843        settings: watch::Receiver<Settings>,
 844        cx: &mut ViewContext<Self>,
 845    ) -> Self {
 846        Self::new(EditorMode::Full, buffer, project, settings, None, cx)
 847    }
 848
 849    pub fn clone(&self, nav_history: ItemNavHistory, cx: &mut ViewContext<Self>) -> Self {
 850        let mut clone = Self::new(
 851            self.mode,
 852            self.buffer.clone(),
 853            self.project.clone(),
 854            self.settings.clone(),
 855            self.get_field_editor_theme,
 856            cx,
 857        );
 858        clone.scroll_position = self.scroll_position;
 859        clone.scroll_top_anchor = self.scroll_top_anchor.clone();
 860        clone.nav_history = Some(nav_history);
 861        clone.searchable = self.searchable;
 862        clone
 863    }
 864
 865    fn new(
 866        mode: EditorMode,
 867        buffer: ModelHandle<MultiBuffer>,
 868        project: Option<ModelHandle<Project>>,
 869        settings: watch::Receiver<Settings>,
 870        get_field_editor_theme: Option<GetFieldEditorTheme>,
 871        cx: &mut ViewContext<Self>,
 872    ) -> Self {
 873        let display_map = cx.add_model(|cx| {
 874            let settings = settings.borrow();
 875            let style = build_style(&*settings, get_field_editor_theme, None, cx);
 876            DisplayMap::new(
 877                buffer.clone(),
 878                settings.tab_size,
 879                style.text.font_id,
 880                style.text.font_size,
 881                None,
 882                2,
 883                1,
 884                cx,
 885            )
 886        });
 887        cx.observe(&buffer, Self::on_buffer_changed).detach();
 888        cx.subscribe(&buffer, Self::on_buffer_event).detach();
 889        cx.observe(&display_map, Self::on_display_map_changed)
 890            .detach();
 891
 892        let mut this = Self {
 893            handle: cx.weak_handle(),
 894            buffer,
 895            display_map,
 896            selections: Arc::from([]),
 897            pending_selection: Some(PendingSelection {
 898                selection: Selection {
 899                    id: 0,
 900                    start: Anchor::min(),
 901                    end: Anchor::min(),
 902                    reversed: false,
 903                    goal: SelectionGoal::None,
 904                },
 905                mode: SelectMode::Character,
 906            }),
 907            columnar_selection_tail: None,
 908            next_selection_id: 1,
 909            add_selections_state: None,
 910            select_next_state: None,
 911            selection_history: Default::default(),
 912            autoclose_stack: Default::default(),
 913            snippet_stack: Default::default(),
 914            select_larger_syntax_node_stack: Vec::new(),
 915            active_diagnostics: None,
 916            settings,
 917            soft_wrap_mode_override: None,
 918            get_field_editor_theme,
 919            project,
 920            scroll_position: Vector2F::zero(),
 921            scroll_top_anchor: None,
 922            autoscroll_request: None,
 923            focused: false,
 924            show_local_cursors: false,
 925            show_local_selections: true,
 926            blink_epoch: 0,
 927            blinking_paused: false,
 928            mode,
 929            vertical_scroll_margin: 3.0,
 930            placeholder_text: None,
 931            highlighted_rows: None,
 932            background_highlights: Default::default(),
 933            nav_history: None,
 934            context_menu: None,
 935            completion_tasks: Default::default(),
 936            next_completion_id: 0,
 937            available_code_actions: Default::default(),
 938            code_actions_task: Default::default(),
 939            document_highlights_task: Default::default(),
 940            pending_rename: Default::default(),
 941            searchable: true,
 942            override_text_style: None,
 943            cursor_shape: Default::default(),
 944        };
 945        this.end_selection(cx);
 946        this
 947    }
 948
 949    pub fn open_new(
 950        workspace: &mut Workspace,
 951        _: &workspace::OpenNew,
 952        cx: &mut ViewContext<Workspace>,
 953    ) {
 954        let project = workspace.project();
 955        if project.read(cx).is_remote() {
 956            cx.propagate_action();
 957        } else if let Some(buffer) = project
 958            .update(cx, |project, cx| project.create_buffer(cx))
 959            .log_err()
 960        {
 961            workspace.open_item(BufferItemHandle(buffer), cx);
 962        }
 963    }
 964
 965    pub fn replica_id(&self, cx: &AppContext) -> ReplicaId {
 966        self.buffer.read(cx).replica_id()
 967    }
 968
 969    pub fn buffer(&self) -> &ModelHandle<MultiBuffer> {
 970        &self.buffer
 971    }
 972
 973    pub fn title(&self, cx: &AppContext) -> String {
 974        self.buffer().read(cx).title(cx)
 975    }
 976
 977    pub fn snapshot(&mut self, cx: &mut MutableAppContext) -> EditorSnapshot {
 978        EditorSnapshot {
 979            mode: self.mode,
 980            display_snapshot: self.display_map.update(cx, |map, cx| map.snapshot(cx)),
 981            scroll_position: self.scroll_position,
 982            scroll_top_anchor: self.scroll_top_anchor.clone(),
 983            placeholder_text: self.placeholder_text.clone(),
 984            is_focused: self
 985                .handle
 986                .upgrade(cx)
 987                .map_or(false, |handle| handle.is_focused(cx)),
 988        }
 989    }
 990
 991    pub fn language<'a>(&self, cx: &'a AppContext) -> Option<&'a Arc<Language>> {
 992        self.buffer.read(cx).language(cx)
 993    }
 994
 995    fn style(&self, cx: &AppContext) -> EditorStyle {
 996        build_style(
 997            &*self.settings.borrow(),
 998            self.get_field_editor_theme,
 999            self.override_text_style.as_deref(),
1000            cx,
1001        )
1002    }
1003
1004    pub fn set_placeholder_text(
1005        &mut self,
1006        placeholder_text: impl Into<Arc<str>>,
1007        cx: &mut ViewContext<Self>,
1008    ) {
1009        self.placeholder_text = Some(placeholder_text.into());
1010        cx.notify();
1011    }
1012
1013    pub fn set_vertical_scroll_margin(&mut self, margin_rows: usize, cx: &mut ViewContext<Self>) {
1014        self.vertical_scroll_margin = margin_rows as f32;
1015        cx.notify();
1016    }
1017
1018    pub fn set_scroll_position(&mut self, scroll_position: Vector2F, cx: &mut ViewContext<Self>) {
1019        let map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
1020
1021        if scroll_position.y() == 0. {
1022            self.scroll_top_anchor = None;
1023            self.scroll_position = scroll_position;
1024        } else {
1025            let scroll_top_buffer_offset =
1026                DisplayPoint::new(scroll_position.y() as u32, 0).to_offset(&map, Bias::Right);
1027            let anchor = map
1028                .buffer_snapshot
1029                .anchor_at(scroll_top_buffer_offset, Bias::Right);
1030            self.scroll_position = vec2f(
1031                scroll_position.x(),
1032                scroll_position.y() - anchor.to_display_point(&map).row() as f32,
1033            );
1034            self.scroll_top_anchor = Some(anchor);
1035        }
1036
1037        cx.notify();
1038    }
1039
1040    pub fn set_cursor_shape(&mut self, cursor_shape: CursorShape, cx: &mut ViewContext<Self>) {
1041        self.cursor_shape = cursor_shape;
1042        cx.notify();
1043    }
1044
1045    pub fn scroll_position(&self, cx: &mut ViewContext<Self>) -> Vector2F {
1046        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
1047        compute_scroll_position(&display_map, self.scroll_position, &self.scroll_top_anchor)
1048    }
1049
1050    pub fn clamp_scroll_left(&mut self, max: f32) -> bool {
1051        if max < self.scroll_position.x() {
1052            self.scroll_position.set_x(max);
1053            true
1054        } else {
1055            false
1056        }
1057    }
1058
1059    pub fn autoscroll_vertically(
1060        &mut self,
1061        viewport_height: f32,
1062        line_height: f32,
1063        cx: &mut ViewContext<Self>,
1064    ) -> bool {
1065        let visible_lines = viewport_height / line_height;
1066        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
1067        let mut scroll_position =
1068            compute_scroll_position(&display_map, self.scroll_position, &self.scroll_top_anchor);
1069        let max_scroll_top = if matches!(self.mode, EditorMode::AutoHeight { .. }) {
1070            (display_map.max_point().row() as f32 - visible_lines + 1.).max(0.)
1071        } else {
1072            display_map.max_point().row().saturating_sub(1) as f32
1073        };
1074        if scroll_position.y() > max_scroll_top {
1075            scroll_position.set_y(max_scroll_top);
1076            self.set_scroll_position(scroll_position, cx);
1077        }
1078
1079        let autoscroll = if let Some(autoscroll) = self.autoscroll_request.take() {
1080            autoscroll
1081        } else {
1082            return false;
1083        };
1084
1085        let first_cursor_top;
1086        let last_cursor_bottom;
1087        if let Some(highlighted_rows) = &self.highlighted_rows {
1088            first_cursor_top = highlighted_rows.start as f32;
1089            last_cursor_bottom = first_cursor_top + 1.;
1090        } else if autoscroll == Autoscroll::Newest {
1091            let newest_selection =
1092                self.newest_selection_with_snapshot::<Point>(&display_map.buffer_snapshot);
1093            first_cursor_top = newest_selection.head().to_display_point(&display_map).row() as f32;
1094            last_cursor_bottom = first_cursor_top + 1.;
1095        } else {
1096            let selections = self.local_selections::<Point>(cx);
1097            first_cursor_top = selections
1098                .first()
1099                .unwrap()
1100                .head()
1101                .to_display_point(&display_map)
1102                .row() as f32;
1103            last_cursor_bottom = selections
1104                .last()
1105                .unwrap()
1106                .head()
1107                .to_display_point(&display_map)
1108                .row() as f32
1109                + 1.0;
1110        }
1111
1112        let margin = if matches!(self.mode, EditorMode::AutoHeight { .. }) {
1113            0.
1114        } else {
1115            ((visible_lines - (last_cursor_bottom - first_cursor_top)) / 2.0).floor()
1116        };
1117        if margin < 0.0 {
1118            return false;
1119        }
1120
1121        match autoscroll {
1122            Autoscroll::Fit | Autoscroll::Newest => {
1123                let margin = margin.min(self.vertical_scroll_margin);
1124                let target_top = (first_cursor_top - margin).max(0.0);
1125                let target_bottom = last_cursor_bottom + margin;
1126                let start_row = scroll_position.y();
1127                let end_row = start_row + visible_lines;
1128
1129                if target_top < start_row {
1130                    scroll_position.set_y(target_top);
1131                    self.set_scroll_position(scroll_position, cx);
1132                } else if target_bottom >= end_row {
1133                    scroll_position.set_y(target_bottom - visible_lines);
1134                    self.set_scroll_position(scroll_position, cx);
1135                }
1136            }
1137            Autoscroll::Center => {
1138                scroll_position.set_y((first_cursor_top - margin).max(0.0));
1139                self.set_scroll_position(scroll_position, cx);
1140            }
1141        }
1142
1143        true
1144    }
1145
1146    pub fn autoscroll_horizontally(
1147        &mut self,
1148        start_row: u32,
1149        viewport_width: f32,
1150        scroll_width: f32,
1151        max_glyph_width: f32,
1152        layouts: &[text_layout::Line],
1153        cx: &mut ViewContext<Self>,
1154    ) -> bool {
1155        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
1156        let selections = self.local_selections::<Point>(cx);
1157
1158        let mut target_left;
1159        let mut target_right;
1160
1161        if self.highlighted_rows.is_some() {
1162            target_left = 0.0_f32;
1163            target_right = 0.0_f32;
1164        } else {
1165            target_left = std::f32::INFINITY;
1166            target_right = 0.0_f32;
1167            for selection in selections {
1168                let head = selection.head().to_display_point(&display_map);
1169                if head.row() >= start_row && head.row() < start_row + layouts.len() as u32 {
1170                    let start_column = head.column().saturating_sub(3);
1171                    let end_column = cmp::min(display_map.line_len(head.row()), head.column() + 3);
1172                    target_left = target_left.min(
1173                        layouts[(head.row() - start_row) as usize]
1174                            .x_for_index(start_column as usize),
1175                    );
1176                    target_right = target_right.max(
1177                        layouts[(head.row() - start_row) as usize].x_for_index(end_column as usize)
1178                            + max_glyph_width,
1179                    );
1180                }
1181            }
1182        }
1183
1184        target_right = target_right.min(scroll_width);
1185
1186        if target_right - target_left > viewport_width {
1187            return false;
1188        }
1189
1190        let scroll_left = self.scroll_position.x() * max_glyph_width;
1191        let scroll_right = scroll_left + viewport_width;
1192
1193        if target_left < scroll_left {
1194            self.scroll_position.set_x(target_left / max_glyph_width);
1195            true
1196        } else if target_right > scroll_right {
1197            self.scroll_position
1198                .set_x((target_right - viewport_width) / max_glyph_width);
1199            true
1200        } else {
1201            false
1202        }
1203    }
1204
1205    fn select(&mut self, Select(phase): &Select, cx: &mut ViewContext<Self>) {
1206        self.hide_context_menu(cx);
1207
1208        match phase {
1209            SelectPhase::Begin {
1210                position,
1211                add,
1212                click_count,
1213            } => self.begin_selection(*position, *add, *click_count, cx),
1214            SelectPhase::BeginColumnar {
1215                position,
1216                overshoot,
1217            } => self.begin_columnar_selection(*position, *overshoot, cx),
1218            SelectPhase::Extend {
1219                position,
1220                click_count,
1221            } => self.extend_selection(*position, *click_count, cx),
1222            SelectPhase::Update {
1223                position,
1224                overshoot,
1225                scroll_position,
1226            } => self.update_selection(*position, *overshoot, *scroll_position, cx),
1227            SelectPhase::End => self.end_selection(cx),
1228        }
1229    }
1230
1231    fn extend_selection(
1232        &mut self,
1233        position: DisplayPoint,
1234        click_count: usize,
1235        cx: &mut ViewContext<Self>,
1236    ) {
1237        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
1238        let tail = self
1239            .newest_selection_with_snapshot::<usize>(&display_map.buffer_snapshot)
1240            .tail();
1241        self.begin_selection(position, false, click_count, cx);
1242
1243        let position = position.to_offset(&display_map, Bias::Left);
1244        let tail_anchor = display_map.buffer_snapshot.anchor_before(tail);
1245        let mut pending = self.pending_selection.clone().unwrap();
1246
1247        if position >= tail {
1248            pending.selection.start = tail_anchor.clone();
1249        } else {
1250            pending.selection.end = tail_anchor.clone();
1251            pending.selection.reversed = true;
1252        }
1253
1254        match &mut pending.mode {
1255            SelectMode::Word(range) | SelectMode::Line(range) => {
1256                *range = tail_anchor.clone()..tail_anchor
1257            }
1258            _ => {}
1259        }
1260
1261        self.set_selections(self.selections.clone(), Some(pending), cx);
1262    }
1263
1264    fn begin_selection(
1265        &mut self,
1266        position: DisplayPoint,
1267        add: bool,
1268        click_count: usize,
1269        cx: &mut ViewContext<Self>,
1270    ) {
1271        if !self.focused {
1272            cx.focus_self();
1273            cx.emit(Event::Activate);
1274        }
1275
1276        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
1277        let buffer = &display_map.buffer_snapshot;
1278        let newest_selection = self.newest_anchor_selection().clone();
1279
1280        let start;
1281        let end;
1282        let mode;
1283        match click_count {
1284            1 => {
1285                start = buffer.anchor_before(position.to_point(&display_map));
1286                end = start.clone();
1287                mode = SelectMode::Character;
1288            }
1289            2 => {
1290                let range = movement::surrounding_word(&display_map, position);
1291                start = buffer.anchor_before(range.start.to_point(&display_map));
1292                end = buffer.anchor_before(range.end.to_point(&display_map));
1293                mode = SelectMode::Word(start.clone()..end.clone());
1294            }
1295            3 => {
1296                let position = display_map
1297                    .clip_point(position, Bias::Left)
1298                    .to_point(&display_map);
1299                let line_start = display_map.prev_line_boundary(position).0;
1300                let next_line_start = buffer.clip_point(
1301                    display_map.next_line_boundary(position).0 + Point::new(1, 0),
1302                    Bias::Left,
1303                );
1304                start = buffer.anchor_before(line_start);
1305                end = buffer.anchor_before(next_line_start);
1306                mode = SelectMode::Line(start.clone()..end.clone());
1307            }
1308            _ => {
1309                start = buffer.anchor_before(0);
1310                end = buffer.anchor_before(buffer.len());
1311                mode = SelectMode::All;
1312            }
1313        }
1314
1315        self.push_to_nav_history(newest_selection.head(), Some(end.to_point(&buffer)), cx);
1316
1317        let selection = Selection {
1318            id: post_inc(&mut self.next_selection_id),
1319            start,
1320            end,
1321            reversed: false,
1322            goal: SelectionGoal::None,
1323        };
1324
1325        let mut selections;
1326        if add {
1327            selections = self.selections.clone();
1328            // Remove the newest selection if it was added due to a previous mouse up
1329            // within this multi-click.
1330            if click_count > 1 {
1331                selections = self
1332                    .selections
1333                    .iter()
1334                    .filter(|selection| selection.id != newest_selection.id)
1335                    .cloned()
1336                    .collect();
1337            }
1338        } else {
1339            selections = Arc::from([]);
1340        }
1341        self.set_selections(selections, Some(PendingSelection { selection, mode }), cx);
1342
1343        cx.notify();
1344    }
1345
1346    fn begin_columnar_selection(
1347        &mut self,
1348        position: DisplayPoint,
1349        overshoot: u32,
1350        cx: &mut ViewContext<Self>,
1351    ) {
1352        if !self.focused {
1353            cx.focus_self();
1354            cx.emit(Event::Activate);
1355        }
1356
1357        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
1358        let tail = self
1359            .newest_selection_with_snapshot::<Point>(&display_map.buffer_snapshot)
1360            .tail();
1361        self.columnar_selection_tail = Some(display_map.buffer_snapshot.anchor_before(tail));
1362
1363        self.select_columns(
1364            tail.to_display_point(&display_map),
1365            position,
1366            overshoot,
1367            &display_map,
1368            cx,
1369        );
1370    }
1371
1372    fn update_selection(
1373        &mut self,
1374        position: DisplayPoint,
1375        overshoot: u32,
1376        scroll_position: Vector2F,
1377        cx: &mut ViewContext<Self>,
1378    ) {
1379        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
1380
1381        if let Some(tail) = self.columnar_selection_tail.as_ref() {
1382            let tail = tail.to_display_point(&display_map);
1383            self.select_columns(tail, position, overshoot, &display_map, cx);
1384        } else if let Some(mut pending) = self.pending_selection.clone() {
1385            let buffer = self.buffer.read(cx).snapshot(cx);
1386            let head;
1387            let tail;
1388            match &pending.mode {
1389                SelectMode::Character => {
1390                    head = position.to_point(&display_map);
1391                    tail = pending.selection.tail().to_point(&buffer);
1392                }
1393                SelectMode::Word(original_range) => {
1394                    let original_display_range = original_range.start.to_display_point(&display_map)
1395                        ..original_range.end.to_display_point(&display_map);
1396                    let original_buffer_range = original_display_range.start.to_point(&display_map)
1397                        ..original_display_range.end.to_point(&display_map);
1398                    if movement::is_inside_word(&display_map, position)
1399                        || original_display_range.contains(&position)
1400                    {
1401                        let word_range = movement::surrounding_word(&display_map, position);
1402                        if word_range.start < original_display_range.start {
1403                            head = word_range.start.to_point(&display_map);
1404                        } else {
1405                            head = word_range.end.to_point(&display_map);
1406                        }
1407                    } else {
1408                        head = position.to_point(&display_map);
1409                    }
1410
1411                    if head <= original_buffer_range.start {
1412                        tail = original_buffer_range.end;
1413                    } else {
1414                        tail = original_buffer_range.start;
1415                    }
1416                }
1417                SelectMode::Line(original_range) => {
1418                    let original_range = original_range.to_point(&display_map.buffer_snapshot);
1419
1420                    let position = display_map
1421                        .clip_point(position, Bias::Left)
1422                        .to_point(&display_map);
1423                    let line_start = display_map.prev_line_boundary(position).0;
1424                    let next_line_start = buffer.clip_point(
1425                        display_map.next_line_boundary(position).0 + Point::new(1, 0),
1426                        Bias::Left,
1427                    );
1428
1429                    if line_start < original_range.start {
1430                        head = line_start
1431                    } else {
1432                        head = next_line_start
1433                    }
1434
1435                    if head <= original_range.start {
1436                        tail = original_range.end;
1437                    } else {
1438                        tail = original_range.start;
1439                    }
1440                }
1441                SelectMode::All => {
1442                    return;
1443                }
1444            };
1445
1446            if head < tail {
1447                pending.selection.start = buffer.anchor_before(head);
1448                pending.selection.end = buffer.anchor_before(tail);
1449                pending.selection.reversed = true;
1450            } else {
1451                pending.selection.start = buffer.anchor_before(tail);
1452                pending.selection.end = buffer.anchor_before(head);
1453                pending.selection.reversed = false;
1454            }
1455            self.set_selections(self.selections.clone(), Some(pending), cx);
1456        } else {
1457            log::error!("update_selection dispatched with no pending selection");
1458            return;
1459        }
1460
1461        self.set_scroll_position(scroll_position, cx);
1462        cx.notify();
1463    }
1464
1465    fn end_selection(&mut self, cx: &mut ViewContext<Self>) {
1466        self.columnar_selection_tail.take();
1467        if self.pending_selection.is_some() {
1468            let selections = self.local_selections::<usize>(cx);
1469            self.update_selections(selections, None, cx);
1470        }
1471    }
1472
1473    fn select_columns(
1474        &mut self,
1475        tail: DisplayPoint,
1476        head: DisplayPoint,
1477        overshoot: u32,
1478        display_map: &DisplaySnapshot,
1479        cx: &mut ViewContext<Self>,
1480    ) {
1481        let start_row = cmp::min(tail.row(), head.row());
1482        let end_row = cmp::max(tail.row(), head.row());
1483        let start_column = cmp::min(tail.column(), head.column() + overshoot);
1484        let end_column = cmp::max(tail.column(), head.column() + overshoot);
1485        let reversed = start_column < tail.column();
1486
1487        let selections = (start_row..=end_row)
1488            .filter_map(|row| {
1489                if start_column <= display_map.line_len(row) && !display_map.is_block_line(row) {
1490                    let start = display_map
1491                        .clip_point(DisplayPoint::new(row, start_column), Bias::Left)
1492                        .to_point(&display_map);
1493                    let end = display_map
1494                        .clip_point(DisplayPoint::new(row, end_column), Bias::Right)
1495                        .to_point(&display_map);
1496                    Some(Selection {
1497                        id: post_inc(&mut self.next_selection_id),
1498                        start,
1499                        end,
1500                        reversed,
1501                        goal: SelectionGoal::None,
1502                    })
1503                } else {
1504                    None
1505                }
1506            })
1507            .collect::<Vec<_>>();
1508
1509        self.update_selections(selections, None, cx);
1510        cx.notify();
1511    }
1512
1513    pub fn is_selecting(&self) -> bool {
1514        self.pending_selection.is_some() || self.columnar_selection_tail.is_some()
1515    }
1516
1517    pub fn cancel(&mut self, _: &Cancel, cx: &mut ViewContext<Self>) {
1518        if self.take_rename(false, cx).is_some() {
1519            return;
1520        }
1521
1522        if self.hide_context_menu(cx).is_some() {
1523            return;
1524        }
1525
1526        if self.snippet_stack.pop().is_some() {
1527            return;
1528        }
1529
1530        if self.mode != EditorMode::Full {
1531            cx.propagate_action();
1532            return;
1533        }
1534
1535        if self.active_diagnostics.is_some() {
1536            self.dismiss_diagnostics(cx);
1537        } else if let Some(pending) = self.pending_selection.clone() {
1538            let mut selections = self.selections.clone();
1539            if selections.is_empty() {
1540                selections = Arc::from([pending.selection]);
1541            }
1542            self.set_selections(selections, None, cx);
1543            self.request_autoscroll(Autoscroll::Fit, cx);
1544        } else {
1545            let mut oldest_selection = self.oldest_selection::<usize>(&cx);
1546            if self.selection_count() == 1 {
1547                if oldest_selection.is_empty() {
1548                    cx.propagate_action();
1549                    return;
1550                }
1551
1552                oldest_selection.start = oldest_selection.head().clone();
1553                oldest_selection.end = oldest_selection.head().clone();
1554            }
1555            self.update_selections(vec![oldest_selection], Some(Autoscroll::Fit), cx);
1556        }
1557    }
1558
1559    #[cfg(any(test, feature = "test-support"))]
1560    pub fn selected_ranges<D: TextDimension + Ord + Sub<D, Output = D>>(
1561        &self,
1562        cx: &mut MutableAppContext,
1563    ) -> Vec<Range<D>> {
1564        self.local_selections::<D>(cx)
1565            .iter()
1566            .map(|s| {
1567                if s.reversed {
1568                    s.end.clone()..s.start.clone()
1569                } else {
1570                    s.start.clone()..s.end.clone()
1571                }
1572            })
1573            .collect()
1574    }
1575
1576    #[cfg(any(test, feature = "test-support"))]
1577    pub fn selected_display_ranges(&self, cx: &mut MutableAppContext) -> Vec<Range<DisplayPoint>> {
1578        let display_map = self
1579            .display_map
1580            .update(cx, |display_map, cx| display_map.snapshot(cx));
1581        self.selections
1582            .iter()
1583            .chain(
1584                self.pending_selection
1585                    .as_ref()
1586                    .map(|pending| &pending.selection),
1587            )
1588            .map(|s| {
1589                if s.reversed {
1590                    s.end.to_display_point(&display_map)..s.start.to_display_point(&display_map)
1591                } else {
1592                    s.start.to_display_point(&display_map)..s.end.to_display_point(&display_map)
1593                }
1594            })
1595            .collect()
1596    }
1597
1598    pub fn select_ranges<I, T>(
1599        &mut self,
1600        ranges: I,
1601        autoscroll: Option<Autoscroll>,
1602        cx: &mut ViewContext<Self>,
1603    ) where
1604        I: IntoIterator<Item = Range<T>>,
1605        T: ToOffset,
1606    {
1607        let buffer = self.buffer.read(cx).snapshot(cx);
1608        let selections = ranges
1609            .into_iter()
1610            .map(|range| {
1611                let mut start = range.start.to_offset(&buffer);
1612                let mut end = range.end.to_offset(&buffer);
1613                let reversed = if start > end {
1614                    mem::swap(&mut start, &mut end);
1615                    true
1616                } else {
1617                    false
1618                };
1619                Selection {
1620                    id: post_inc(&mut self.next_selection_id),
1621                    start,
1622                    end,
1623                    reversed,
1624                    goal: SelectionGoal::None,
1625                }
1626            })
1627            .collect::<Vec<_>>();
1628        self.update_selections(selections, autoscroll, cx);
1629    }
1630
1631    #[cfg(any(test, feature = "test-support"))]
1632    pub fn select_display_ranges<'a, T>(&mut self, ranges: T, cx: &mut ViewContext<Self>)
1633    where
1634        T: IntoIterator<Item = &'a Range<DisplayPoint>>,
1635    {
1636        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
1637        let selections = ranges
1638            .into_iter()
1639            .map(|range| {
1640                let mut start = range.start;
1641                let mut end = range.end;
1642                let reversed = if start > end {
1643                    mem::swap(&mut start, &mut end);
1644                    true
1645                } else {
1646                    false
1647                };
1648                Selection {
1649                    id: post_inc(&mut self.next_selection_id),
1650                    start: start.to_point(&display_map),
1651                    end: end.to_point(&display_map),
1652                    reversed,
1653                    goal: SelectionGoal::None,
1654                }
1655            })
1656            .collect();
1657        self.update_selections(selections, None, cx);
1658    }
1659
1660    pub fn handle_input(&mut self, action: &Input, cx: &mut ViewContext<Self>) {
1661        let text = action.0.as_ref();
1662        if !self.skip_autoclose_end(text, cx) {
1663            self.start_transaction(cx);
1664            if !self.surround_with_bracket_pair(text, cx) {
1665                self.insert(text, cx);
1666                self.autoclose_bracket_pairs(cx);
1667            }
1668            self.end_transaction(cx);
1669            self.trigger_completion_on_input(text, cx);
1670        }
1671    }
1672
1673    pub fn newline(&mut self, _: &Newline, cx: &mut ViewContext<Self>) {
1674        self.start_transaction(cx);
1675        let mut old_selections = SmallVec::<[_; 32]>::new();
1676        {
1677            let selections = self.local_selections::<usize>(cx);
1678            let buffer = self.buffer.read(cx).snapshot(cx);
1679            for selection in selections.iter() {
1680                let start_point = selection.start.to_point(&buffer);
1681                let indent = buffer
1682                    .indent_column_for_line(start_point.row)
1683                    .min(start_point.column);
1684                let start = selection.start;
1685                let end = selection.end;
1686
1687                let mut insert_extra_newline = false;
1688                if let Some(language) = buffer.language() {
1689                    let leading_whitespace_len = buffer
1690                        .reversed_chars_at(start)
1691                        .take_while(|c| c.is_whitespace() && *c != '\n')
1692                        .map(|c| c.len_utf8())
1693                        .sum::<usize>();
1694
1695                    let trailing_whitespace_len = buffer
1696                        .chars_at(end)
1697                        .take_while(|c| c.is_whitespace() && *c != '\n')
1698                        .map(|c| c.len_utf8())
1699                        .sum::<usize>();
1700
1701                    insert_extra_newline = language.brackets().iter().any(|pair| {
1702                        let pair_start = pair.start.trim_end();
1703                        let pair_end = pair.end.trim_start();
1704
1705                        pair.newline
1706                            && buffer.contains_str_at(end + trailing_whitespace_len, pair_end)
1707                            && buffer.contains_str_at(
1708                                (start - leading_whitespace_len).saturating_sub(pair_start.len()),
1709                                pair_start,
1710                            )
1711                    });
1712                }
1713
1714                old_selections.push((
1715                    selection.id,
1716                    buffer.anchor_after(end),
1717                    start..end,
1718                    indent,
1719                    insert_extra_newline,
1720                ));
1721            }
1722        }
1723
1724        self.buffer.update(cx, |buffer, cx| {
1725            let mut delta = 0_isize;
1726            let mut pending_edit: Option<PendingEdit> = None;
1727            for (_, _, range, indent, insert_extra_newline) in &old_selections {
1728                if pending_edit.as_ref().map_or(false, |pending| {
1729                    pending.indent != *indent
1730                        || pending.insert_extra_newline != *insert_extra_newline
1731                }) {
1732                    let pending = pending_edit.take().unwrap();
1733                    let mut new_text = String::with_capacity(1 + pending.indent as usize);
1734                    new_text.push('\n');
1735                    new_text.extend(iter::repeat(' ').take(pending.indent as usize));
1736                    if pending.insert_extra_newline {
1737                        new_text = new_text.repeat(2);
1738                    }
1739                    buffer.edit_with_autoindent(pending.ranges, new_text, cx);
1740                    delta += pending.delta;
1741                }
1742
1743                let start = (range.start as isize + delta) as usize;
1744                let end = (range.end as isize + delta) as usize;
1745                let mut text_len = *indent as usize + 1;
1746                if *insert_extra_newline {
1747                    text_len *= 2;
1748                }
1749
1750                let pending = pending_edit.get_or_insert_with(Default::default);
1751                pending.delta += text_len as isize - (end - start) as isize;
1752                pending.indent = *indent;
1753                pending.insert_extra_newline = *insert_extra_newline;
1754                pending.ranges.push(start..end);
1755            }
1756
1757            let pending = pending_edit.unwrap();
1758            let mut new_text = String::with_capacity(1 + pending.indent as usize);
1759            new_text.push('\n');
1760            new_text.extend(iter::repeat(' ').take(pending.indent as usize));
1761            if pending.insert_extra_newline {
1762                new_text = new_text.repeat(2);
1763            }
1764            buffer.edit_with_autoindent(pending.ranges, new_text, cx);
1765
1766            let buffer = buffer.read(cx);
1767            self.selections = self
1768                .selections
1769                .iter()
1770                .cloned()
1771                .zip(old_selections)
1772                .map(
1773                    |(mut new_selection, (_, end_anchor, _, _, insert_extra_newline))| {
1774                        let mut cursor = end_anchor.to_point(&buffer);
1775                        if insert_extra_newline {
1776                            cursor.row -= 1;
1777                            cursor.column = buffer.line_len(cursor.row);
1778                        }
1779                        let anchor = buffer.anchor_after(cursor);
1780                        new_selection.start = anchor.clone();
1781                        new_selection.end = anchor;
1782                        new_selection
1783                    },
1784                )
1785                .collect();
1786        });
1787
1788        self.request_autoscroll(Autoscroll::Fit, cx);
1789        self.end_transaction(cx);
1790
1791        #[derive(Default)]
1792        struct PendingEdit {
1793            indent: u32,
1794            insert_extra_newline: bool,
1795            delta: isize,
1796            ranges: SmallVec<[Range<usize>; 32]>,
1797        }
1798    }
1799
1800    pub fn insert(&mut self, text: &str, cx: &mut ViewContext<Self>) {
1801        self.start_transaction(cx);
1802
1803        let old_selections = self.local_selections::<usize>(cx);
1804        let selection_anchors = self.buffer.update(cx, |buffer, cx| {
1805            let anchors = {
1806                let snapshot = buffer.read(cx);
1807                old_selections
1808                    .iter()
1809                    .map(|s| (s.id, s.goal, snapshot.anchor_after(s.end)))
1810                    .collect::<Vec<_>>()
1811            };
1812            let edit_ranges = old_selections.iter().map(|s| s.start..s.end);
1813            buffer.edit_with_autoindent(edit_ranges, text, cx);
1814            anchors
1815        });
1816
1817        let selections = {
1818            let snapshot = self.buffer.read(cx).read(cx);
1819            selection_anchors
1820                .into_iter()
1821                .map(|(id, goal, position)| {
1822                    let position = position.to_offset(&snapshot);
1823                    Selection {
1824                        id,
1825                        start: position,
1826                        end: position,
1827                        goal,
1828                        reversed: false,
1829                    }
1830                })
1831                .collect()
1832        };
1833        self.update_selections(selections, Some(Autoscroll::Fit), cx);
1834        self.end_transaction(cx);
1835    }
1836
1837    fn trigger_completion_on_input(&mut self, text: &str, cx: &mut ViewContext<Self>) {
1838        let selection = self.newest_anchor_selection();
1839        if self
1840            .buffer
1841            .read(cx)
1842            .is_completion_trigger(selection.head(), text, cx)
1843        {
1844            self.show_completions(&ShowCompletions, cx);
1845        } else {
1846            self.hide_context_menu(cx);
1847        }
1848    }
1849
1850    fn surround_with_bracket_pair(&mut self, text: &str, cx: &mut ViewContext<Self>) -> bool {
1851        let snapshot = self.buffer.read(cx).snapshot(cx);
1852        if let Some(pair) = snapshot
1853            .language()
1854            .and_then(|language| language.brackets().iter().find(|b| b.start == text))
1855            .cloned()
1856        {
1857            if self
1858                .local_selections::<usize>(cx)
1859                .iter()
1860                .any(|selection| selection.is_empty())
1861            {
1862                false
1863            } else {
1864                let mut selections = self.selections.to_vec();
1865                for selection in &mut selections {
1866                    selection.end = selection.end.bias_left(&snapshot);
1867                }
1868                drop(snapshot);
1869
1870                self.buffer.update(cx, |buffer, cx| {
1871                    buffer.edit(
1872                        selections.iter().map(|s| s.start.clone()..s.start.clone()),
1873                        &pair.start,
1874                        cx,
1875                    );
1876                    buffer.edit(
1877                        selections.iter().map(|s| s.end.clone()..s.end.clone()),
1878                        &pair.end,
1879                        cx,
1880                    );
1881                });
1882
1883                let snapshot = self.buffer.read(cx).read(cx);
1884                for selection in &mut selections {
1885                    selection.end = selection.end.bias_right(&snapshot);
1886                }
1887                drop(snapshot);
1888
1889                self.set_selections(selections.into(), None, cx);
1890                true
1891            }
1892        } else {
1893            false
1894        }
1895    }
1896
1897    fn autoclose_bracket_pairs(&mut self, cx: &mut ViewContext<Self>) {
1898        let selections = self.local_selections::<usize>(cx);
1899        let mut bracket_pair_state = None;
1900        let mut new_selections = None;
1901        self.buffer.update(cx, |buffer, cx| {
1902            let mut snapshot = buffer.snapshot(cx);
1903            let left_biased_selections = selections
1904                .iter()
1905                .map(|selection| Selection {
1906                    id: selection.id,
1907                    start: snapshot.anchor_before(selection.start),
1908                    end: snapshot.anchor_before(selection.end),
1909                    reversed: selection.reversed,
1910                    goal: selection.goal,
1911                })
1912                .collect::<Vec<_>>();
1913
1914            let autoclose_pair = snapshot.language().and_then(|language| {
1915                let first_selection_start = selections.first().unwrap().start;
1916                let pair = language.brackets().iter().find(|pair| {
1917                    snapshot.contains_str_at(
1918                        first_selection_start.saturating_sub(pair.start.len()),
1919                        &pair.start,
1920                    )
1921                });
1922                pair.and_then(|pair| {
1923                    let should_autoclose = selections.iter().all(|selection| {
1924                        // Ensure all selections are parked at the end of a pair start.
1925                        if snapshot.contains_str_at(
1926                            selection.start.saturating_sub(pair.start.len()),
1927                            &pair.start,
1928                        ) {
1929                            // Autoclose only if the next character is a whitespace or a pair end
1930                            // (possibly a different one from the pair we are inserting).
1931                            snapshot
1932                                .chars_at(selection.start)
1933                                .next()
1934                                .map_or(true, |ch| ch.is_whitespace())
1935                                || language.brackets().iter().any(|pair| {
1936                                    snapshot.contains_str_at(selection.start, &pair.end)
1937                                })
1938                        } else {
1939                            false
1940                        }
1941                    });
1942
1943                    if should_autoclose {
1944                        Some(pair.clone())
1945                    } else {
1946                        None
1947                    }
1948                })
1949            });
1950
1951            if let Some(pair) = autoclose_pair {
1952                let selection_ranges = selections
1953                    .iter()
1954                    .map(|selection| {
1955                        let start = selection.start.to_offset(&snapshot);
1956                        start..start
1957                    })
1958                    .collect::<SmallVec<[_; 32]>>();
1959
1960                buffer.edit(selection_ranges, &pair.end, cx);
1961                snapshot = buffer.snapshot(cx);
1962
1963                new_selections = Some(
1964                    self.resolve_selections::<usize, _>(left_biased_selections.iter(), &snapshot)
1965                        .collect::<Vec<_>>(),
1966                );
1967
1968                if pair.end.len() == 1 {
1969                    let mut delta = 0;
1970                    bracket_pair_state = Some(BracketPairState {
1971                        ranges: selections
1972                            .iter()
1973                            .map(move |selection| {
1974                                let offset = selection.start + delta;
1975                                delta += 1;
1976                                snapshot.anchor_before(offset)..snapshot.anchor_after(offset)
1977                            })
1978                            .collect(),
1979                        pair,
1980                    });
1981                }
1982            }
1983        });
1984
1985        if let Some(new_selections) = new_selections {
1986            self.update_selections(new_selections, None, cx);
1987        }
1988        if let Some(bracket_pair_state) = bracket_pair_state {
1989            self.autoclose_stack.push(bracket_pair_state);
1990        }
1991    }
1992
1993    fn skip_autoclose_end(&mut self, text: &str, cx: &mut ViewContext<Self>) -> bool {
1994        let old_selections = self.local_selections::<usize>(cx);
1995        let autoclose_pair = if let Some(autoclose_pair) = self.autoclose_stack.last() {
1996            autoclose_pair
1997        } else {
1998            return false;
1999        };
2000        if text != autoclose_pair.pair.end {
2001            return false;
2002        }
2003
2004        debug_assert_eq!(old_selections.len(), autoclose_pair.ranges.len());
2005
2006        let buffer = self.buffer.read(cx).snapshot(cx);
2007        if old_selections
2008            .iter()
2009            .zip(autoclose_pair.ranges.iter().map(|r| r.to_offset(&buffer)))
2010            .all(|(selection, autoclose_range)| {
2011                let autoclose_range_end = autoclose_range.end.to_offset(&buffer);
2012                selection.is_empty() && selection.start == autoclose_range_end
2013            })
2014        {
2015            let new_selections = old_selections
2016                .into_iter()
2017                .map(|selection| {
2018                    let cursor = selection.start + 1;
2019                    Selection {
2020                        id: selection.id,
2021                        start: cursor,
2022                        end: cursor,
2023                        reversed: false,
2024                        goal: SelectionGoal::None,
2025                    }
2026                })
2027                .collect();
2028            self.autoclose_stack.pop();
2029            self.update_selections(new_selections, Some(Autoscroll::Fit), cx);
2030            true
2031        } else {
2032            false
2033        }
2034    }
2035
2036    fn completion_query(buffer: &MultiBufferSnapshot, position: impl ToOffset) -> Option<String> {
2037        let offset = position.to_offset(buffer);
2038        let (word_range, kind) = buffer.surrounding_word(offset);
2039        if offset > word_range.start && kind == Some(CharKind::Word) {
2040            Some(
2041                buffer
2042                    .text_for_range(word_range.start..offset)
2043                    .collect::<String>(),
2044            )
2045        } else {
2046            None
2047        }
2048    }
2049
2050    fn show_completions(&mut self, _: &ShowCompletions, cx: &mut ViewContext<Self>) {
2051        if self.pending_rename.is_some() {
2052            return;
2053        }
2054
2055        let project = if let Some(project) = self.project.clone() {
2056            project
2057        } else {
2058            return;
2059        };
2060
2061        let position = self.newest_anchor_selection().head();
2062        let (buffer, buffer_position) = if let Some(output) = self
2063            .buffer
2064            .read(cx)
2065            .text_anchor_for_position(position.clone(), cx)
2066        {
2067            output
2068        } else {
2069            return;
2070        };
2071
2072        let query = Self::completion_query(&self.buffer.read(cx).read(cx), position.clone());
2073        let completions = project.update(cx, |project, cx| {
2074            project.completions(&buffer, buffer_position.clone(), cx)
2075        });
2076
2077        let id = post_inc(&mut self.next_completion_id);
2078        let task = cx.spawn_weak(|this, mut cx| {
2079            async move {
2080                let completions = completions.await?;
2081                if completions.is_empty() {
2082                    return Ok(());
2083                }
2084
2085                let mut menu = CompletionsMenu {
2086                    id,
2087                    initial_position: position,
2088                    match_candidates: completions
2089                        .iter()
2090                        .enumerate()
2091                        .map(|(id, completion)| {
2092                            StringMatchCandidate::new(
2093                                id,
2094                                completion.label.text[completion.label.filter_range.clone()].into(),
2095                            )
2096                        })
2097                        .collect(),
2098                    buffer,
2099                    completions: completions.into(),
2100                    matches: Vec::new().into(),
2101                    selected_item: 0,
2102                    list: Default::default(),
2103                };
2104
2105                menu.filter(query.as_deref(), cx.background()).await;
2106
2107                if let Some(this) = this.upgrade(&cx) {
2108                    this.update(&mut cx, |this, cx| {
2109                        match this.context_menu.as_ref() {
2110                            None => {}
2111                            Some(ContextMenu::Completions(prev_menu)) => {
2112                                if prev_menu.id > menu.id {
2113                                    return;
2114                                }
2115                            }
2116                            _ => return,
2117                        }
2118
2119                        this.completion_tasks.retain(|(id, _)| *id > menu.id);
2120                        if this.focused {
2121                            this.show_context_menu(ContextMenu::Completions(menu), cx);
2122                        }
2123
2124                        cx.notify();
2125                    });
2126                }
2127                Ok::<_, anyhow::Error>(())
2128            }
2129            .log_err()
2130        });
2131        self.completion_tasks.push((id, task));
2132    }
2133
2134    pub fn confirm_completion(
2135        &mut self,
2136        ConfirmCompletion(completion_ix): &ConfirmCompletion,
2137        cx: &mut ViewContext<Self>,
2138    ) -> Option<Task<Result<()>>> {
2139        use language::ToOffset as _;
2140
2141        let completions_menu = if let ContextMenu::Completions(menu) = self.hide_context_menu(cx)? {
2142            menu
2143        } else {
2144            return None;
2145        };
2146
2147        let mat = completions_menu
2148            .matches
2149            .get(completion_ix.unwrap_or(completions_menu.selected_item))?;
2150        let buffer_handle = completions_menu.buffer;
2151        let completion = completions_menu.completions.get(mat.candidate_id)?;
2152
2153        let snippet;
2154        let text;
2155        if completion.is_snippet() {
2156            snippet = Some(Snippet::parse(&completion.new_text).log_err()?);
2157            text = snippet.as_ref().unwrap().text.clone();
2158        } else {
2159            snippet = None;
2160            text = completion.new_text.clone();
2161        };
2162        let buffer = buffer_handle.read(cx);
2163        let old_range = completion.old_range.to_offset(&buffer);
2164        let old_text = buffer.text_for_range(old_range.clone()).collect::<String>();
2165
2166        let selections = self.local_selections::<usize>(cx);
2167        let newest_selection = self.newest_anchor_selection();
2168        if newest_selection.start.buffer_id != Some(buffer_handle.id()) {
2169            return None;
2170        }
2171
2172        let lookbehind = newest_selection
2173            .start
2174            .text_anchor
2175            .to_offset(buffer)
2176            .saturating_sub(old_range.start);
2177        let lookahead = old_range
2178            .end
2179            .saturating_sub(newest_selection.end.text_anchor.to_offset(buffer));
2180        let mut common_prefix_len = old_text
2181            .bytes()
2182            .zip(text.bytes())
2183            .take_while(|(a, b)| a == b)
2184            .count();
2185
2186        let snapshot = self.buffer.read(cx).snapshot(cx);
2187        let mut ranges = Vec::new();
2188        for selection in &selections {
2189            if snapshot.contains_str_at(selection.start.saturating_sub(lookbehind), &old_text) {
2190                let start = selection.start.saturating_sub(lookbehind);
2191                let end = selection.end + lookahead;
2192                ranges.push(start + common_prefix_len..end);
2193            } else {
2194                common_prefix_len = 0;
2195                ranges.clear();
2196                ranges.extend(selections.iter().map(|s| {
2197                    if s.id == newest_selection.id {
2198                        old_range.clone()
2199                    } else {
2200                        s.start..s.end
2201                    }
2202                }));
2203                break;
2204            }
2205        }
2206        let text = &text[common_prefix_len..];
2207
2208        self.start_transaction(cx);
2209        if let Some(mut snippet) = snippet {
2210            snippet.text = text.to_string();
2211            for tabstop in snippet.tabstops.iter_mut().flatten() {
2212                tabstop.start -= common_prefix_len as isize;
2213                tabstop.end -= common_prefix_len as isize;
2214            }
2215
2216            self.insert_snippet(&ranges, snippet, cx).log_err();
2217        } else {
2218            self.buffer.update(cx, |buffer, cx| {
2219                buffer.edit_with_autoindent(ranges, text, cx);
2220            });
2221        }
2222        self.end_transaction(cx);
2223
2224        let project = self.project.clone()?;
2225        let apply_edits = project.update(cx, |project, cx| {
2226            project.apply_additional_edits_for_completion(
2227                buffer_handle,
2228                completion.clone(),
2229                true,
2230                cx,
2231            )
2232        });
2233        Some(cx.foreground().spawn(async move {
2234            apply_edits.await?;
2235            Ok(())
2236        }))
2237    }
2238
2239    pub fn toggle_code_actions(
2240        &mut self,
2241        &ToggleCodeActions(deployed_from_indicator): &ToggleCodeActions,
2242        cx: &mut ViewContext<Self>,
2243    ) {
2244        if matches!(
2245            self.context_menu.as_ref(),
2246            Some(ContextMenu::CodeActions(_))
2247        ) {
2248            self.context_menu.take();
2249            cx.notify();
2250            return;
2251        }
2252
2253        let mut task = self.code_actions_task.take();
2254        cx.spawn_weak(|this, mut cx| async move {
2255            while let Some(prev_task) = task {
2256                prev_task.await;
2257                task = this
2258                    .upgrade(&cx)
2259                    .and_then(|this| this.update(&mut cx, |this, _| this.code_actions_task.take()));
2260            }
2261
2262            if let Some(this) = this.upgrade(&cx) {
2263                this.update(&mut cx, |this, cx| {
2264                    if this.focused {
2265                        if let Some((buffer, actions)) = this.available_code_actions.clone() {
2266                            this.show_context_menu(
2267                                ContextMenu::CodeActions(CodeActionsMenu {
2268                                    buffer,
2269                                    actions,
2270                                    selected_item: Default::default(),
2271                                    list: Default::default(),
2272                                    deployed_from_indicator,
2273                                }),
2274                                cx,
2275                            );
2276                        }
2277                    }
2278                })
2279            }
2280            Ok::<_, anyhow::Error>(())
2281        })
2282        .detach_and_log_err(cx);
2283    }
2284
2285    pub fn confirm_code_action(
2286        workspace: &mut Workspace,
2287        ConfirmCodeAction(action_ix): &ConfirmCodeAction,
2288        cx: &mut ViewContext<Workspace>,
2289    ) -> Option<Task<Result<()>>> {
2290        let editor = workspace.active_item(cx)?.act_as::<Editor>(cx)?;
2291        let actions_menu = if let ContextMenu::CodeActions(menu) =
2292            editor.update(cx, |editor, cx| editor.hide_context_menu(cx))?
2293        {
2294            menu
2295        } else {
2296            return None;
2297        };
2298        let action_ix = action_ix.unwrap_or(actions_menu.selected_item);
2299        let action = actions_menu.actions.get(action_ix)?.clone();
2300        let title = action.lsp_action.title.clone();
2301        let buffer = actions_menu.buffer;
2302
2303        let apply_code_actions = workspace.project().clone().update(cx, |project, cx| {
2304            project.apply_code_action(buffer, action, true, cx)
2305        });
2306        Some(cx.spawn(|workspace, cx| async move {
2307            let project_transaction = apply_code_actions.await?;
2308            Self::open_project_transaction(editor, workspace, project_transaction, title, cx).await
2309        }))
2310    }
2311
2312    async fn open_project_transaction(
2313        this: ViewHandle<Editor>,
2314        workspace: ViewHandle<Workspace>,
2315        transaction: ProjectTransaction,
2316        title: String,
2317        mut cx: AsyncAppContext,
2318    ) -> Result<()> {
2319        let replica_id = this.read_with(&cx, |this, cx| this.replica_id(cx));
2320
2321        // If the code action's edits are all contained within this editor, then
2322        // avoid opening a new editor to display them.
2323        let mut entries = transaction.0.iter();
2324        if let Some((buffer, transaction)) = entries.next() {
2325            if entries.next().is_none() {
2326                let excerpt = this.read_with(&cx, |editor, cx| {
2327                    editor
2328                        .buffer()
2329                        .read(cx)
2330                        .excerpt_containing(editor.newest_anchor_selection().head(), cx)
2331                });
2332                if let Some((excerpted_buffer, excerpt_range)) = excerpt {
2333                    if excerpted_buffer == *buffer {
2334                        let snapshot = buffer.read_with(&cx, |buffer, _| buffer.snapshot());
2335                        let excerpt_range = excerpt_range.to_offset(&snapshot);
2336                        if snapshot
2337                            .edited_ranges_for_transaction(transaction)
2338                            .all(|range| {
2339                                excerpt_range.start <= range.start && excerpt_range.end >= range.end
2340                            })
2341                        {
2342                            return Ok(());
2343                        }
2344                    }
2345                }
2346            }
2347        }
2348
2349        let mut ranges_to_highlight = Vec::new();
2350        let excerpt_buffer = cx.add_model(|cx| {
2351            let mut multibuffer = MultiBuffer::new(replica_id).with_title(title);
2352            for (buffer, transaction) in &transaction.0 {
2353                let snapshot = buffer.read(cx).snapshot();
2354                ranges_to_highlight.extend(
2355                    multibuffer.push_excerpts_with_context_lines(
2356                        buffer.clone(),
2357                        snapshot
2358                            .edited_ranges_for_transaction::<usize>(transaction)
2359                            .collect(),
2360                        1,
2361                        cx,
2362                    ),
2363                );
2364            }
2365            multibuffer.push_transaction(&transaction.0);
2366            multibuffer
2367        });
2368
2369        workspace.update(&mut cx, |workspace, cx| {
2370            let editor = workspace.open_item(MultiBufferItemHandle(excerpt_buffer), cx);
2371            if let Some(editor) = editor.act_as::<Self>(cx) {
2372                editor.update(cx, |editor, cx| {
2373                    let color = editor.style(cx).highlighted_line_background;
2374                    editor.highlight_background::<Self>(ranges_to_highlight, color, cx);
2375                });
2376            }
2377        });
2378
2379        Ok(())
2380    }
2381
2382    fn refresh_code_actions(&mut self, cx: &mut ViewContext<Self>) -> Option<()> {
2383        let project = self.project.as_ref()?;
2384        let buffer = self.buffer.read(cx);
2385        let newest_selection = self.newest_anchor_selection().clone();
2386        let (start_buffer, start) = buffer.text_anchor_for_position(newest_selection.start, cx)?;
2387        let (end_buffer, end) = buffer.text_anchor_for_position(newest_selection.end, cx)?;
2388        if start_buffer != end_buffer {
2389            return None;
2390        }
2391
2392        let actions = project.update(cx, |project, cx| {
2393            project.code_actions(&start_buffer, start..end, cx)
2394        });
2395        self.code_actions_task = Some(cx.spawn_weak(|this, mut cx| async move {
2396            let actions = actions.await;
2397            if let Some(this) = this.upgrade(&cx) {
2398                this.update(&mut cx, |this, cx| {
2399                    this.available_code_actions = actions.log_err().and_then(|actions| {
2400                        if actions.is_empty() {
2401                            None
2402                        } else {
2403                            Some((start_buffer, actions.into()))
2404                        }
2405                    });
2406                    cx.notify();
2407                })
2408            }
2409        }));
2410        None
2411    }
2412
2413    fn refresh_document_highlights(&mut self, cx: &mut ViewContext<Self>) -> Option<()> {
2414        if self.pending_rename.is_some() {
2415            return None;
2416        }
2417
2418        let project = self.project.as_ref()?;
2419        let buffer = self.buffer.read(cx);
2420        let newest_selection = self.newest_anchor_selection().clone();
2421        let cursor_position = newest_selection.head();
2422        let (cursor_buffer, cursor_buffer_position) =
2423            buffer.text_anchor_for_position(cursor_position.clone(), cx)?;
2424        let (tail_buffer, _) = buffer.text_anchor_for_position(newest_selection.tail(), cx)?;
2425        if cursor_buffer != tail_buffer {
2426            return None;
2427        }
2428
2429        let highlights = project.update(cx, |project, cx| {
2430            project.document_highlights(&cursor_buffer, cursor_buffer_position, cx)
2431        });
2432
2433        self.document_highlights_task = Some(cx.spawn_weak(|this, mut cx| async move {
2434            let highlights = highlights.log_err().await;
2435            if let Some((this, highlights)) = this.upgrade(&cx).zip(highlights) {
2436                this.update(&mut cx, |this, cx| {
2437                    if this.pending_rename.is_some() {
2438                        return;
2439                    }
2440
2441                    let buffer_id = cursor_position.buffer_id;
2442                    let excerpt_id = cursor_position.excerpt_id.clone();
2443                    let style = this.style(cx);
2444                    let read_background = style.document_highlight_read_background;
2445                    let write_background = style.document_highlight_write_background;
2446                    let buffer = this.buffer.read(cx);
2447                    if !buffer
2448                        .text_anchor_for_position(cursor_position, cx)
2449                        .map_or(false, |(buffer, _)| buffer == cursor_buffer)
2450                    {
2451                        return;
2452                    }
2453
2454                    let mut write_ranges = Vec::new();
2455                    let mut read_ranges = Vec::new();
2456                    for highlight in highlights {
2457                        let range = Anchor {
2458                            buffer_id,
2459                            excerpt_id: excerpt_id.clone(),
2460                            text_anchor: highlight.range.start,
2461                        }..Anchor {
2462                            buffer_id,
2463                            excerpt_id: excerpt_id.clone(),
2464                            text_anchor: highlight.range.end,
2465                        };
2466                        if highlight.kind == lsp::DocumentHighlightKind::WRITE {
2467                            write_ranges.push(range);
2468                        } else {
2469                            read_ranges.push(range);
2470                        }
2471                    }
2472
2473                    this.highlight_background::<DocumentHighlightRead>(
2474                        read_ranges,
2475                        read_background,
2476                        cx,
2477                    );
2478                    this.highlight_background::<DocumentHighlightWrite>(
2479                        write_ranges,
2480                        write_background,
2481                        cx,
2482                    );
2483                    cx.notify();
2484                });
2485            }
2486        }));
2487        None
2488    }
2489
2490    pub fn render_code_actions_indicator(
2491        &self,
2492        style: &EditorStyle,
2493        cx: &mut ViewContext<Self>,
2494    ) -> Option<ElementBox> {
2495        if self.available_code_actions.is_some() {
2496            enum Tag {}
2497            Some(
2498                MouseEventHandler::new::<Tag, _, _>(0, cx, |_, _| {
2499                    Svg::new("icons/zap.svg")
2500                        .with_color(style.code_actions_indicator)
2501                        .boxed()
2502                })
2503                .with_cursor_style(CursorStyle::PointingHand)
2504                .with_padding(Padding::uniform(3.))
2505                .on_mouse_down(|cx| {
2506                    cx.dispatch_action(ToggleCodeActions(true));
2507                })
2508                .boxed(),
2509            )
2510        } else {
2511            None
2512        }
2513    }
2514
2515    pub fn context_menu_visible(&self) -> bool {
2516        self.context_menu
2517            .as_ref()
2518            .map_or(false, |menu| menu.visible())
2519    }
2520
2521    pub fn render_context_menu(
2522        &self,
2523        cursor_position: DisplayPoint,
2524        style: EditorStyle,
2525        cx: &AppContext,
2526    ) -> Option<(DisplayPoint, ElementBox)> {
2527        self.context_menu
2528            .as_ref()
2529            .map(|menu| menu.render(cursor_position, style, cx))
2530    }
2531
2532    fn show_context_menu(&mut self, menu: ContextMenu, cx: &mut ViewContext<Self>) {
2533        if !matches!(menu, ContextMenu::Completions(_)) {
2534            self.completion_tasks.clear();
2535        }
2536        self.context_menu = Some(menu);
2537        cx.notify();
2538    }
2539
2540    fn hide_context_menu(&mut self, cx: &mut ViewContext<Self>) -> Option<ContextMenu> {
2541        cx.notify();
2542        self.completion_tasks.clear();
2543        self.context_menu.take()
2544    }
2545
2546    pub fn insert_snippet(
2547        &mut self,
2548        insertion_ranges: &[Range<usize>],
2549        snippet: Snippet,
2550        cx: &mut ViewContext<Self>,
2551    ) -> Result<()> {
2552        let tabstops = self.buffer.update(cx, |buffer, cx| {
2553            buffer.edit_with_autoindent(insertion_ranges.iter().cloned(), &snippet.text, cx);
2554
2555            let snapshot = &*buffer.read(cx);
2556            let snippet = &snippet;
2557            snippet
2558                .tabstops
2559                .iter()
2560                .map(|tabstop| {
2561                    let mut tabstop_ranges = tabstop
2562                        .iter()
2563                        .flat_map(|tabstop_range| {
2564                            let mut delta = 0 as isize;
2565                            insertion_ranges.iter().map(move |insertion_range| {
2566                                let insertion_start = insertion_range.start as isize + delta;
2567                                delta +=
2568                                    snippet.text.len() as isize - insertion_range.len() as isize;
2569
2570                                let start = snapshot.anchor_before(
2571                                    (insertion_start + tabstop_range.start) as usize,
2572                                );
2573                                let end = snapshot
2574                                    .anchor_after((insertion_start + tabstop_range.end) as usize);
2575                                start..end
2576                            })
2577                        })
2578                        .collect::<Vec<_>>();
2579                    tabstop_ranges
2580                        .sort_unstable_by(|a, b| a.start.cmp(&b.start, snapshot).unwrap());
2581                    tabstop_ranges
2582                })
2583                .collect::<Vec<_>>()
2584        });
2585
2586        if let Some(tabstop) = tabstops.first() {
2587            self.select_ranges(tabstop.iter().cloned(), Some(Autoscroll::Fit), cx);
2588            self.snippet_stack.push(SnippetState {
2589                active_index: 0,
2590                ranges: tabstops,
2591            });
2592        }
2593
2594        Ok(())
2595    }
2596
2597    pub fn move_to_next_snippet_tabstop(&mut self, cx: &mut ViewContext<Self>) -> bool {
2598        self.move_to_snippet_tabstop(Bias::Right, cx)
2599    }
2600
2601    pub fn move_to_prev_snippet_tabstop(&mut self, cx: &mut ViewContext<Self>) {
2602        self.move_to_snippet_tabstop(Bias::Left, cx);
2603    }
2604
2605    pub fn move_to_snippet_tabstop(&mut self, bias: Bias, cx: &mut ViewContext<Self>) -> bool {
2606        let buffer = self.buffer.read(cx).snapshot(cx);
2607
2608        if let Some(snippet) = self.snippet_stack.last_mut() {
2609            match bias {
2610                Bias::Left => {
2611                    if snippet.active_index > 0 {
2612                        snippet.active_index -= 1;
2613                    } else {
2614                        return false;
2615                    }
2616                }
2617                Bias::Right => {
2618                    if snippet.active_index + 1 < snippet.ranges.len() {
2619                        snippet.active_index += 1;
2620                    } else {
2621                        return false;
2622                    }
2623                }
2624            }
2625            if let Some(current_ranges) = snippet.ranges.get(snippet.active_index) {
2626                let new_selections = current_ranges
2627                    .iter()
2628                    .map(|new_range| {
2629                        let new_range = new_range.to_offset(&buffer);
2630                        Selection {
2631                            id: post_inc(&mut self.next_selection_id),
2632                            start: new_range.start,
2633                            end: new_range.end,
2634                            reversed: false,
2635                            goal: SelectionGoal::None,
2636                        }
2637                    })
2638                    .collect();
2639
2640                // Remove the snippet state when moving to the last tabstop.
2641                if snippet.active_index + 1 == snippet.ranges.len() {
2642                    self.snippet_stack.pop();
2643                }
2644
2645                self.update_selections(new_selections, Some(Autoscroll::Fit), cx);
2646                return true;
2647            }
2648            self.snippet_stack.pop();
2649        }
2650
2651        false
2652    }
2653
2654    pub fn clear(&mut self, cx: &mut ViewContext<Self>) {
2655        self.start_transaction(cx);
2656        self.select_all(&SelectAll, cx);
2657        self.insert("", cx);
2658        self.end_transaction(cx);
2659    }
2660
2661    pub fn backspace(&mut self, _: &Backspace, cx: &mut ViewContext<Self>) {
2662        self.start_transaction(cx);
2663        let mut selections = self.local_selections::<Point>(cx);
2664        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2665        for selection in &mut selections {
2666            if selection.is_empty() {
2667                let old_head = selection.head();
2668                let mut new_head =
2669                    movement::left(&display_map, old_head.to_display_point(&display_map))
2670                        .unwrap()
2671                        .to_point(&display_map);
2672                if let Some((buffer, line_buffer_range)) = display_map
2673                    .buffer_snapshot
2674                    .buffer_line_for_row(old_head.row)
2675                {
2676                    let indent_column = buffer.indent_column_for_line(line_buffer_range.start.row);
2677                    if old_head.column <= indent_column && old_head.column > 0 {
2678                        let indent = buffer.indent_size();
2679                        new_head = cmp::min(
2680                            new_head,
2681                            Point::new(old_head.row, ((old_head.column - 1) / indent) * indent),
2682                        );
2683                    }
2684                }
2685
2686                selection.set_head(new_head);
2687                selection.goal = SelectionGoal::None;
2688            }
2689        }
2690        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2691        self.insert("", cx);
2692        self.end_transaction(cx);
2693    }
2694
2695    pub fn delete(&mut self, _: &Delete, cx: &mut ViewContext<Self>) {
2696        self.start_transaction(cx);
2697        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2698        let mut selections = self.local_selections::<Point>(cx);
2699        for selection in &mut selections {
2700            if selection.is_empty() {
2701                let head = selection.head().to_display_point(&display_map);
2702                let cursor = movement::right(&display_map, head)
2703                    .unwrap()
2704                    .to_point(&display_map);
2705                selection.set_head(cursor);
2706                selection.goal = SelectionGoal::None;
2707            }
2708        }
2709        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2710        self.insert(&"", cx);
2711        self.end_transaction(cx);
2712    }
2713
2714    pub fn tab(&mut self, _: &Tab, cx: &mut ViewContext<Self>) {
2715        if self.move_to_next_snippet_tabstop(cx) {
2716            return;
2717        }
2718
2719        self.start_transaction(cx);
2720        let tab_size = self.settings.borrow().tab_size;
2721        let mut selections = self.local_selections::<Point>(cx);
2722        let mut last_indent = None;
2723        self.buffer.update(cx, |buffer, cx| {
2724            for selection in &mut selections {
2725                if selection.is_empty() {
2726                    let char_column = buffer
2727                        .read(cx)
2728                        .text_for_range(Point::new(selection.start.row, 0)..selection.start)
2729                        .flat_map(str::chars)
2730                        .count();
2731                    let chars_to_next_tab_stop = tab_size - (char_column % tab_size);
2732                    buffer.edit(
2733                        [selection.start..selection.start],
2734                        " ".repeat(chars_to_next_tab_stop),
2735                        cx,
2736                    );
2737                    selection.start.column += chars_to_next_tab_stop as u32;
2738                    selection.end = selection.start;
2739                } else {
2740                    let mut start_row = selection.start.row;
2741                    let mut end_row = selection.end.row + 1;
2742
2743                    // If a selection ends at the beginning of a line, don't indent
2744                    // that last line.
2745                    if selection.end.column == 0 {
2746                        end_row -= 1;
2747                    }
2748
2749                    // Avoid re-indenting a row that has already been indented by a
2750                    // previous selection, but still update this selection's column
2751                    // to reflect that indentation.
2752                    if let Some((last_indent_row, last_indent_len)) = last_indent {
2753                        if last_indent_row == selection.start.row {
2754                            selection.start.column += last_indent_len;
2755                            start_row += 1;
2756                        }
2757                        if last_indent_row == selection.end.row {
2758                            selection.end.column += last_indent_len;
2759                        }
2760                    }
2761
2762                    for row in start_row..end_row {
2763                        let indent_column = buffer.read(cx).indent_column_for_line(row) as usize;
2764                        let columns_to_next_tab_stop = tab_size - (indent_column % tab_size);
2765                        let row_start = Point::new(row, 0);
2766                        buffer.edit(
2767                            [row_start..row_start],
2768                            " ".repeat(columns_to_next_tab_stop),
2769                            cx,
2770                        );
2771
2772                        // Update this selection's endpoints to reflect the indentation.
2773                        if row == selection.start.row {
2774                            selection.start.column += columns_to_next_tab_stop as u32;
2775                        }
2776                        if row == selection.end.row {
2777                            selection.end.column += columns_to_next_tab_stop as u32;
2778                        }
2779
2780                        last_indent = Some((row, columns_to_next_tab_stop as u32));
2781                    }
2782                }
2783            }
2784        });
2785
2786        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2787        self.end_transaction(cx);
2788    }
2789
2790    pub fn outdent(&mut self, _: &Outdent, cx: &mut ViewContext<Self>) {
2791        if !self.snippet_stack.is_empty() {
2792            self.move_to_prev_snippet_tabstop(cx);
2793            return;
2794        }
2795
2796        self.start_transaction(cx);
2797        let tab_size = self.settings.borrow().tab_size;
2798        let selections = self.local_selections::<Point>(cx);
2799        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2800        let mut deletion_ranges = Vec::new();
2801        let mut last_outdent = None;
2802        {
2803            let buffer = self.buffer.read(cx).read(cx);
2804            for selection in &selections {
2805                let mut rows = selection.spanned_rows(false, &display_map);
2806
2807                // Avoid re-outdenting a row that has already been outdented by a
2808                // previous selection.
2809                if let Some(last_row) = last_outdent {
2810                    if last_row == rows.start {
2811                        rows.start += 1;
2812                    }
2813                }
2814
2815                for row in rows {
2816                    let column = buffer.indent_column_for_line(row) as usize;
2817                    if column > 0 {
2818                        let mut deletion_len = (column % tab_size) as u32;
2819                        if deletion_len == 0 {
2820                            deletion_len = tab_size as u32;
2821                        }
2822                        deletion_ranges.push(Point::new(row, 0)..Point::new(row, deletion_len));
2823                        last_outdent = Some(row);
2824                    }
2825                }
2826            }
2827        }
2828        self.buffer.update(cx, |buffer, cx| {
2829            buffer.edit(deletion_ranges, "", cx);
2830        });
2831
2832        self.update_selections(
2833            self.local_selections::<usize>(cx),
2834            Some(Autoscroll::Fit),
2835            cx,
2836        );
2837        self.end_transaction(cx);
2838    }
2839
2840    pub fn delete_line(&mut self, _: &DeleteLine, cx: &mut ViewContext<Self>) {
2841        self.start_transaction(cx);
2842
2843        let selections = self.local_selections::<Point>(cx);
2844        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2845        let buffer = self.buffer.read(cx).snapshot(cx);
2846
2847        let mut new_cursors = Vec::new();
2848        let mut edit_ranges = Vec::new();
2849        let mut selections = selections.iter().peekable();
2850        while let Some(selection) = selections.next() {
2851            let mut rows = selection.spanned_rows(false, &display_map);
2852            let goal_display_column = selection.head().to_display_point(&display_map).column();
2853
2854            // Accumulate contiguous regions of rows that we want to delete.
2855            while let Some(next_selection) = selections.peek() {
2856                let next_rows = next_selection.spanned_rows(false, &display_map);
2857                if next_rows.start <= rows.end {
2858                    rows.end = next_rows.end;
2859                    selections.next().unwrap();
2860                } else {
2861                    break;
2862                }
2863            }
2864
2865            let mut edit_start = Point::new(rows.start, 0).to_offset(&buffer);
2866            let edit_end;
2867            let cursor_buffer_row;
2868            if buffer.max_point().row >= rows.end {
2869                // If there's a line after the range, delete the \n from the end of the row range
2870                // and position the cursor on the next line.
2871                edit_end = Point::new(rows.end, 0).to_offset(&buffer);
2872                cursor_buffer_row = rows.end;
2873            } else {
2874                // If there isn't a line after the range, delete the \n from the line before the
2875                // start of the row range and position the cursor there.
2876                edit_start = edit_start.saturating_sub(1);
2877                edit_end = buffer.len();
2878                cursor_buffer_row = rows.start.saturating_sub(1);
2879            }
2880
2881            let mut cursor = Point::new(cursor_buffer_row, 0).to_display_point(&display_map);
2882            *cursor.column_mut() =
2883                cmp::min(goal_display_column, display_map.line_len(cursor.row()));
2884
2885            new_cursors.push((
2886                selection.id,
2887                buffer.anchor_after(cursor.to_point(&display_map)),
2888            ));
2889            edit_ranges.push(edit_start..edit_end);
2890        }
2891
2892        let buffer = self.buffer.update(cx, |buffer, cx| {
2893            buffer.edit(edit_ranges, "", cx);
2894            buffer.snapshot(cx)
2895        });
2896        let new_selections = new_cursors
2897            .into_iter()
2898            .map(|(id, cursor)| {
2899                let cursor = cursor.to_point(&buffer);
2900                Selection {
2901                    id,
2902                    start: cursor,
2903                    end: cursor,
2904                    reversed: false,
2905                    goal: SelectionGoal::None,
2906                }
2907            })
2908            .collect();
2909        self.update_selections(new_selections, Some(Autoscroll::Fit), cx);
2910        self.end_transaction(cx);
2911    }
2912
2913    pub fn duplicate_line(&mut self, _: &DuplicateLine, cx: &mut ViewContext<Self>) {
2914        self.start_transaction(cx);
2915
2916        let selections = self.local_selections::<Point>(cx);
2917        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2918        let buffer = &display_map.buffer_snapshot;
2919
2920        let mut edits = Vec::new();
2921        let mut selections_iter = selections.iter().peekable();
2922        while let Some(selection) = selections_iter.next() {
2923            // Avoid duplicating the same lines twice.
2924            let mut rows = selection.spanned_rows(false, &display_map);
2925
2926            while let Some(next_selection) = selections_iter.peek() {
2927                let next_rows = next_selection.spanned_rows(false, &display_map);
2928                if next_rows.start <= rows.end - 1 {
2929                    rows.end = next_rows.end;
2930                    selections_iter.next().unwrap();
2931                } else {
2932                    break;
2933                }
2934            }
2935
2936            // Copy the text from the selected row region and splice it at the start of the region.
2937            let start = Point::new(rows.start, 0);
2938            let end = Point::new(rows.end - 1, buffer.line_len(rows.end - 1));
2939            let text = buffer
2940                .text_for_range(start..end)
2941                .chain(Some("\n"))
2942                .collect::<String>();
2943            edits.push((start, text, rows.len() as u32));
2944        }
2945
2946        self.buffer.update(cx, |buffer, cx| {
2947            for (point, text, _) in edits.into_iter().rev() {
2948                buffer.edit(Some(point..point), text, cx);
2949            }
2950        });
2951
2952        self.request_autoscroll(Autoscroll::Fit, cx);
2953        self.end_transaction(cx);
2954    }
2955
2956    pub fn move_line_up(&mut self, _: &MoveLineUp, cx: &mut ViewContext<Self>) {
2957        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2958        let buffer = self.buffer.read(cx).snapshot(cx);
2959
2960        let mut edits = Vec::new();
2961        let mut unfold_ranges = Vec::new();
2962        let mut refold_ranges = Vec::new();
2963
2964        let selections = self.local_selections::<Point>(cx);
2965        let mut selections = selections.iter().peekable();
2966        let mut contiguous_row_selections = Vec::new();
2967        let mut new_selections = Vec::new();
2968
2969        while let Some(selection) = selections.next() {
2970            // Find all the selections that span a contiguous row range
2971            contiguous_row_selections.push(selection.clone());
2972            let start_row = selection.start.row;
2973            let mut end_row = if selection.end.column > 0 || selection.is_empty() {
2974                display_map.next_line_boundary(selection.end).0.row + 1
2975            } else {
2976                selection.end.row
2977            };
2978
2979            while let Some(next_selection) = selections.peek() {
2980                if next_selection.start.row <= end_row {
2981                    end_row = if next_selection.end.column > 0 || next_selection.is_empty() {
2982                        display_map.next_line_boundary(next_selection.end).0.row + 1
2983                    } else {
2984                        next_selection.end.row
2985                    };
2986                    contiguous_row_selections.push(selections.next().unwrap().clone());
2987                } else {
2988                    break;
2989                }
2990            }
2991
2992            // Move the text spanned by the row range to be before the line preceding the row range
2993            if start_row > 0 {
2994                let range_to_move = Point::new(start_row - 1, buffer.line_len(start_row - 1))
2995                    ..Point::new(end_row - 1, buffer.line_len(end_row - 1));
2996                let insertion_point = display_map
2997                    .prev_line_boundary(Point::new(start_row - 1, 0))
2998                    .0;
2999
3000                // Don't move lines across excerpts
3001                if buffer
3002                    .excerpt_boundaries_in_range((
3003                        Bound::Excluded(insertion_point),
3004                        Bound::Included(range_to_move.end),
3005                    ))
3006                    .next()
3007                    .is_none()
3008                {
3009                    let text = buffer
3010                        .text_for_range(range_to_move.clone())
3011                        .flat_map(|s| s.chars())
3012                        .skip(1)
3013                        .chain(['\n'])
3014                        .collect::<String>();
3015
3016                    edits.push((
3017                        buffer.anchor_after(range_to_move.start)
3018                            ..buffer.anchor_before(range_to_move.end),
3019                        String::new(),
3020                    ));
3021                    let insertion_anchor = buffer.anchor_after(insertion_point);
3022                    edits.push((insertion_anchor.clone()..insertion_anchor, text));
3023
3024                    let row_delta = range_to_move.start.row - insertion_point.row + 1;
3025
3026                    // Move selections up
3027                    new_selections.extend(contiguous_row_selections.drain(..).map(
3028                        |mut selection| {
3029                            selection.start.row -= row_delta;
3030                            selection.end.row -= row_delta;
3031                            selection
3032                        },
3033                    ));
3034
3035                    // Move folds up
3036                    unfold_ranges.push(range_to_move.clone());
3037                    for fold in display_map.folds_in_range(
3038                        buffer.anchor_before(range_to_move.start)
3039                            ..buffer.anchor_after(range_to_move.end),
3040                    ) {
3041                        let mut start = fold.start.to_point(&buffer);
3042                        let mut end = fold.end.to_point(&buffer);
3043                        start.row -= row_delta;
3044                        end.row -= row_delta;
3045                        refold_ranges.push(start..end);
3046                    }
3047                }
3048            }
3049
3050            // If we didn't move line(s), preserve the existing selections
3051            new_selections.extend(contiguous_row_selections.drain(..));
3052        }
3053
3054        self.start_transaction(cx);
3055        self.unfold_ranges(unfold_ranges, cx);
3056        self.buffer.update(cx, |buffer, cx| {
3057            for (range, text) in edits {
3058                buffer.edit([range], text, cx);
3059            }
3060        });
3061        self.fold_ranges(refold_ranges, cx);
3062        self.update_selections(new_selections, Some(Autoscroll::Fit), cx);
3063        self.end_transaction(cx);
3064    }
3065
3066    pub fn move_line_down(&mut self, _: &MoveLineDown, cx: &mut ViewContext<Self>) {
3067        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3068        let buffer = self.buffer.read(cx).snapshot(cx);
3069
3070        let mut edits = Vec::new();
3071        let mut unfold_ranges = Vec::new();
3072        let mut refold_ranges = Vec::new();
3073
3074        let selections = self.local_selections::<Point>(cx);
3075        let mut selections = selections.iter().peekable();
3076        let mut contiguous_row_selections = Vec::new();
3077        let mut new_selections = Vec::new();
3078
3079        while let Some(selection) = selections.next() {
3080            // Find all the selections that span a contiguous row range
3081            contiguous_row_selections.push(selection.clone());
3082            let start_row = selection.start.row;
3083            let mut end_row = if selection.end.column > 0 || selection.is_empty() {
3084                display_map.next_line_boundary(selection.end).0.row + 1
3085            } else {
3086                selection.end.row
3087            };
3088
3089            while let Some(next_selection) = selections.peek() {
3090                if next_selection.start.row <= end_row {
3091                    end_row = if next_selection.end.column > 0 || next_selection.is_empty() {
3092                        display_map.next_line_boundary(next_selection.end).0.row + 1
3093                    } else {
3094                        next_selection.end.row
3095                    };
3096                    contiguous_row_selections.push(selections.next().unwrap().clone());
3097                } else {
3098                    break;
3099                }
3100            }
3101
3102            // Move the text spanned by the row range to be after the last line of the row range
3103            if end_row <= buffer.max_point().row {
3104                let range_to_move = Point::new(start_row, 0)..Point::new(end_row, 0);
3105                let insertion_point = display_map.next_line_boundary(Point::new(end_row, 0)).0;
3106
3107                // Don't move lines across excerpt boundaries
3108                if buffer
3109                    .excerpt_boundaries_in_range((
3110                        Bound::Excluded(range_to_move.start),
3111                        Bound::Included(insertion_point),
3112                    ))
3113                    .next()
3114                    .is_none()
3115                {
3116                    let mut text = String::from("\n");
3117                    text.extend(buffer.text_for_range(range_to_move.clone()));
3118                    text.pop(); // Drop trailing newline
3119                    edits.push((
3120                        buffer.anchor_after(range_to_move.start)
3121                            ..buffer.anchor_before(range_to_move.end),
3122                        String::new(),
3123                    ));
3124                    let insertion_anchor = buffer.anchor_after(insertion_point);
3125                    edits.push((insertion_anchor.clone()..insertion_anchor, text));
3126
3127                    let row_delta = insertion_point.row - range_to_move.end.row + 1;
3128
3129                    // Move selections down
3130                    new_selections.extend(contiguous_row_selections.drain(..).map(
3131                        |mut selection| {
3132                            selection.start.row += row_delta;
3133                            selection.end.row += row_delta;
3134                            selection
3135                        },
3136                    ));
3137
3138                    // Move folds down
3139                    unfold_ranges.push(range_to_move.clone());
3140                    for fold in display_map.folds_in_range(
3141                        buffer.anchor_before(range_to_move.start)
3142                            ..buffer.anchor_after(range_to_move.end),
3143                    ) {
3144                        let mut start = fold.start.to_point(&buffer);
3145                        let mut end = fold.end.to_point(&buffer);
3146                        start.row += row_delta;
3147                        end.row += row_delta;
3148                        refold_ranges.push(start..end);
3149                    }
3150                }
3151            }
3152
3153            // If we didn't move line(s), preserve the existing selections
3154            new_selections.extend(contiguous_row_selections.drain(..));
3155        }
3156
3157        self.start_transaction(cx);
3158        self.unfold_ranges(unfold_ranges, cx);
3159        self.buffer.update(cx, |buffer, cx| {
3160            for (range, text) in edits {
3161                buffer.edit([range], text, cx);
3162            }
3163        });
3164        self.fold_ranges(refold_ranges, cx);
3165        self.update_selections(new_selections, Some(Autoscroll::Fit), cx);
3166        self.end_transaction(cx);
3167    }
3168
3169    pub fn cut(&mut self, _: &Cut, cx: &mut ViewContext<Self>) {
3170        self.start_transaction(cx);
3171        let mut text = String::new();
3172        let mut selections = self.local_selections::<Point>(cx);
3173        let mut clipboard_selections = Vec::with_capacity(selections.len());
3174        {
3175            let buffer = self.buffer.read(cx).read(cx);
3176            let max_point = buffer.max_point();
3177            for selection in &mut selections {
3178                let is_entire_line = selection.is_empty();
3179                if is_entire_line {
3180                    selection.start = Point::new(selection.start.row, 0);
3181                    selection.end = cmp::min(max_point, Point::new(selection.end.row + 1, 0));
3182                    selection.goal = SelectionGoal::None;
3183                }
3184                let mut len = 0;
3185                for chunk in buffer.text_for_range(selection.start..selection.end) {
3186                    text.push_str(chunk);
3187                    len += chunk.len();
3188                }
3189                clipboard_selections.push(ClipboardSelection {
3190                    len,
3191                    is_entire_line,
3192                });
3193            }
3194        }
3195        self.update_selections(selections, Some(Autoscroll::Fit), cx);
3196        self.insert("", cx);
3197        self.end_transaction(cx);
3198
3199        cx.as_mut()
3200            .write_to_clipboard(ClipboardItem::new(text).with_metadata(clipboard_selections));
3201    }
3202
3203    pub fn copy(&mut self, _: &Copy, cx: &mut ViewContext<Self>) {
3204        let selections = self.local_selections::<Point>(cx);
3205        let mut text = String::new();
3206        let mut clipboard_selections = Vec::with_capacity(selections.len());
3207        {
3208            let buffer = self.buffer.read(cx).read(cx);
3209            let max_point = buffer.max_point();
3210            for selection in selections.iter() {
3211                let mut start = selection.start;
3212                let mut end = selection.end;
3213                let is_entire_line = selection.is_empty();
3214                if is_entire_line {
3215                    start = Point::new(start.row, 0);
3216                    end = cmp::min(max_point, Point::new(start.row + 1, 0));
3217                }
3218                let mut len = 0;
3219                for chunk in buffer.text_for_range(start..end) {
3220                    text.push_str(chunk);
3221                    len += chunk.len();
3222                }
3223                clipboard_selections.push(ClipboardSelection {
3224                    len,
3225                    is_entire_line,
3226                });
3227            }
3228        }
3229
3230        cx.as_mut()
3231            .write_to_clipboard(ClipboardItem::new(text).with_metadata(clipboard_selections));
3232    }
3233
3234    pub fn paste(&mut self, _: &Paste, cx: &mut ViewContext<Self>) {
3235        if let Some(item) = cx.as_mut().read_from_clipboard() {
3236            let clipboard_text = item.text();
3237            if let Some(mut clipboard_selections) = item.metadata::<Vec<ClipboardSelection>>() {
3238                let mut selections = self.local_selections::<usize>(cx);
3239                let all_selections_were_entire_line =
3240                    clipboard_selections.iter().all(|s| s.is_entire_line);
3241                if clipboard_selections.len() != selections.len() {
3242                    clipboard_selections.clear();
3243                }
3244
3245                let mut delta = 0_isize;
3246                let mut start_offset = 0;
3247                for (i, selection) in selections.iter_mut().enumerate() {
3248                    let to_insert;
3249                    let entire_line;
3250                    if let Some(clipboard_selection) = clipboard_selections.get(i) {
3251                        let end_offset = start_offset + clipboard_selection.len;
3252                        to_insert = &clipboard_text[start_offset..end_offset];
3253                        entire_line = clipboard_selection.is_entire_line;
3254                        start_offset = end_offset
3255                    } else {
3256                        to_insert = clipboard_text.as_str();
3257                        entire_line = all_selections_were_entire_line;
3258                    }
3259
3260                    selection.start = (selection.start as isize + delta) as usize;
3261                    selection.end = (selection.end as isize + delta) as usize;
3262
3263                    self.buffer.update(cx, |buffer, cx| {
3264                        // If the corresponding selection was empty when this slice of the
3265                        // clipboard text was written, then the entire line containing the
3266                        // selection was copied. If this selection is also currently empty,
3267                        // then paste the line before the current line of the buffer.
3268                        let range = if selection.is_empty() && entire_line {
3269                            let column = selection.start.to_point(&buffer.read(cx)).column as usize;
3270                            let line_start = selection.start - column;
3271                            line_start..line_start
3272                        } else {
3273                            selection.start..selection.end
3274                        };
3275
3276                        delta += to_insert.len() as isize - range.len() as isize;
3277                        buffer.edit([range], to_insert, cx);
3278                        selection.start += to_insert.len();
3279                        selection.end = selection.start;
3280                    });
3281                }
3282                self.update_selections(selections, Some(Autoscroll::Fit), cx);
3283            } else {
3284                self.insert(clipboard_text, cx);
3285            }
3286        }
3287    }
3288
3289    pub fn undo(&mut self, _: &Undo, cx: &mut ViewContext<Self>) {
3290        if let Some(tx_id) = self.buffer.update(cx, |buffer, cx| buffer.undo(cx)) {
3291            if let Some((selections, _)) = self.selection_history.get(&tx_id).cloned() {
3292                self.set_selections(selections, None, cx);
3293            }
3294            self.request_autoscroll(Autoscroll::Fit, cx);
3295        }
3296    }
3297
3298    pub fn redo(&mut self, _: &Redo, cx: &mut ViewContext<Self>) {
3299        if let Some(tx_id) = self.buffer.update(cx, |buffer, cx| buffer.redo(cx)) {
3300            if let Some((_, Some(selections))) = self.selection_history.get(&tx_id).cloned() {
3301                self.set_selections(selections, None, cx);
3302            }
3303            self.request_autoscroll(Autoscroll::Fit, cx);
3304        }
3305    }
3306
3307    pub fn finalize_last_transaction(&mut self, cx: &mut ViewContext<Self>) {
3308        self.buffer
3309            .update(cx, |buffer, cx| buffer.finalize_last_transaction(cx));
3310    }
3311
3312    pub fn move_left(&mut self, _: &MoveLeft, cx: &mut ViewContext<Self>) {
3313        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3314        let mut selections = self.local_selections::<Point>(cx);
3315        for selection in &mut selections {
3316            let start = selection.start.to_display_point(&display_map);
3317            let end = selection.end.to_display_point(&display_map);
3318
3319            if start != end {
3320                selection.end = selection.start.clone();
3321            } else {
3322                let cursor = movement::left(&display_map, start)
3323                    .unwrap()
3324                    .to_point(&display_map);
3325                selection.start = cursor.clone();
3326                selection.end = cursor;
3327            }
3328            selection.reversed = false;
3329            selection.goal = SelectionGoal::None;
3330        }
3331        self.update_selections(selections, Some(Autoscroll::Fit), cx);
3332    }
3333
3334    pub fn select_left(&mut self, _: &SelectLeft, cx: &mut ViewContext<Self>) {
3335        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3336        let mut selections = self.local_selections::<Point>(cx);
3337        for selection in &mut selections {
3338            let head = selection.head().to_display_point(&display_map);
3339            let cursor = movement::left(&display_map, head)
3340                .unwrap()
3341                .to_point(&display_map);
3342            selection.set_head(cursor);
3343            selection.goal = SelectionGoal::None;
3344        }
3345        self.update_selections(selections, Some(Autoscroll::Fit), cx);
3346    }
3347
3348    pub fn move_right(&mut self, _: &MoveRight, cx: &mut ViewContext<Self>) {
3349        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3350        let mut selections = self.local_selections::<Point>(cx);
3351        for selection in &mut selections {
3352            let start = selection.start.to_display_point(&display_map);
3353            let end = selection.end.to_display_point(&display_map);
3354
3355            if start != end {
3356                selection.start = selection.end.clone();
3357            } else {
3358                let cursor = movement::right(&display_map, end)
3359                    .unwrap()
3360                    .to_point(&display_map);
3361                selection.start = cursor;
3362                selection.end = cursor;
3363            }
3364            selection.reversed = false;
3365            selection.goal = SelectionGoal::None;
3366        }
3367        self.update_selections(selections, Some(Autoscroll::Fit), cx);
3368    }
3369
3370    pub fn select_right(&mut self, _: &SelectRight, cx: &mut ViewContext<Self>) {
3371        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3372        let mut selections = self.local_selections::<Point>(cx);
3373        for selection in &mut selections {
3374            let head = selection.head().to_display_point(&display_map);
3375            let cursor = movement::right(&display_map, head)
3376                .unwrap()
3377                .to_point(&display_map);
3378            selection.set_head(cursor);
3379            selection.goal = SelectionGoal::None;
3380        }
3381        self.update_selections(selections, Some(Autoscroll::Fit), cx);
3382    }
3383
3384    pub fn move_up(&mut self, _: &MoveUp, cx: &mut ViewContext<Self>) {
3385        if self.take_rename(true, cx).is_some() {
3386            return;
3387        }
3388
3389        if let Some(context_menu) = self.context_menu.as_mut() {
3390            if context_menu.select_prev(cx) {
3391                return;
3392            }
3393        }
3394
3395        if matches!(self.mode, EditorMode::SingleLine) {
3396            cx.propagate_action();
3397            return;
3398        }
3399
3400        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3401        let mut selections = self.local_selections::<Point>(cx);
3402        for selection in &mut selections {
3403            let start = selection.start.to_display_point(&display_map);
3404            let end = selection.end.to_display_point(&display_map);
3405            if start != end {
3406                selection.goal = SelectionGoal::None;
3407            }
3408
3409            let (start, goal) = movement::up(&display_map, start, selection.goal).unwrap();
3410            let cursor = start.to_point(&display_map);
3411            selection.start = cursor;
3412            selection.end = cursor;
3413            selection.goal = goal;
3414            selection.reversed = false;
3415        }
3416        self.update_selections(selections, Some(Autoscroll::Fit), cx);
3417    }
3418
3419    pub fn select_up(&mut self, _: &SelectUp, cx: &mut ViewContext<Self>) {
3420        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3421        let mut selections = self.local_selections::<Point>(cx);
3422        for selection in &mut selections {
3423            let head = selection.head().to_display_point(&display_map);
3424            let (head, goal) = movement::up(&display_map, head, selection.goal).unwrap();
3425            let cursor = head.to_point(&display_map);
3426            selection.set_head(cursor);
3427            selection.goal = goal;
3428        }
3429        self.update_selections(selections, Some(Autoscroll::Fit), cx);
3430    }
3431
3432    pub fn move_down(&mut self, _: &MoveDown, cx: &mut ViewContext<Self>) {
3433        self.take_rename(true, cx);
3434
3435        if let Some(context_menu) = self.context_menu.as_mut() {
3436            if context_menu.select_next(cx) {
3437                return;
3438            }
3439        }
3440
3441        if matches!(self.mode, EditorMode::SingleLine) {
3442            cx.propagate_action();
3443            return;
3444        }
3445
3446        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3447        let mut selections = self.local_selections::<Point>(cx);
3448        for selection in &mut selections {
3449            let start = selection.start.to_display_point(&display_map);
3450            let end = selection.end.to_display_point(&display_map);
3451            if start != end {
3452                selection.goal = SelectionGoal::None;
3453            }
3454
3455            let (start, goal) = movement::down(&display_map, end, selection.goal).unwrap();
3456            let cursor = start.to_point(&display_map);
3457            selection.start = cursor;
3458            selection.end = cursor;
3459            selection.goal = goal;
3460            selection.reversed = false;
3461        }
3462        self.update_selections(selections, Some(Autoscroll::Fit), cx);
3463    }
3464
3465    pub fn select_down(&mut self, _: &SelectDown, cx: &mut ViewContext<Self>) {
3466        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3467        let mut selections = self.local_selections::<Point>(cx);
3468        for selection in &mut selections {
3469            let head = selection.head().to_display_point(&display_map);
3470            let (head, goal) = movement::down(&display_map, head, selection.goal).unwrap();
3471            let cursor = head.to_point(&display_map);
3472            selection.set_head(cursor);
3473            selection.goal = goal;
3474        }
3475        self.update_selections(selections, Some(Autoscroll::Fit), cx);
3476    }
3477
3478    pub fn move_to_previous_word_boundary(
3479        &mut self,
3480        _: &MoveToPreviousWordBoundary,
3481        cx: &mut ViewContext<Self>,
3482    ) {
3483        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3484        let mut selections = self.local_selections::<Point>(cx);
3485        for selection in &mut selections {
3486            let head = selection.head().to_display_point(&display_map);
3487            let cursor = movement::prev_word_boundary(&display_map, head).to_point(&display_map);
3488            selection.start = cursor.clone();
3489            selection.end = cursor;
3490            selection.reversed = false;
3491            selection.goal = SelectionGoal::None;
3492        }
3493        self.update_selections(selections, Some(Autoscroll::Fit), cx);
3494    }
3495
3496    pub fn select_to_previous_word_boundary(
3497        &mut self,
3498        _: &SelectToPreviousWordBoundary,
3499        cx: &mut ViewContext<Self>,
3500    ) {
3501        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3502        let mut selections = self.local_selections::<Point>(cx);
3503        for selection in &mut selections {
3504            let head = selection.head().to_display_point(&display_map);
3505            let cursor = movement::prev_word_boundary(&display_map, head).to_point(&display_map);
3506            selection.set_head(cursor);
3507            selection.goal = SelectionGoal::None;
3508        }
3509        self.update_selections(selections, Some(Autoscroll::Fit), cx);
3510    }
3511
3512    pub fn delete_to_previous_word_boundary(
3513        &mut self,
3514        _: &DeleteToPreviousWordBoundary,
3515        cx: &mut ViewContext<Self>,
3516    ) {
3517        self.start_transaction(cx);
3518        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3519        let mut selections = self.local_selections::<Point>(cx);
3520        for selection in &mut selections {
3521            if selection.is_empty() {
3522                let head = selection.head().to_display_point(&display_map);
3523                let cursor =
3524                    movement::prev_word_boundary(&display_map, head).to_point(&display_map);
3525                selection.set_head(cursor);
3526                selection.goal = SelectionGoal::None;
3527            }
3528        }
3529        self.update_selections(selections, Some(Autoscroll::Fit), cx);
3530        self.insert("", cx);
3531        self.end_transaction(cx);
3532    }
3533
3534    pub fn move_to_next_word_boundary(
3535        &mut self,
3536        _: &MoveToNextWordBoundary,
3537        cx: &mut ViewContext<Self>,
3538    ) {
3539        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3540        let mut selections = self.local_selections::<Point>(cx);
3541        for selection in &mut selections {
3542            let head = selection.head().to_display_point(&display_map);
3543            let cursor = movement::next_word_boundary(&display_map, head).to_point(&display_map);
3544            selection.start = cursor;
3545            selection.end = cursor;
3546            selection.reversed = false;
3547            selection.goal = SelectionGoal::None;
3548        }
3549        self.update_selections(selections, Some(Autoscroll::Fit), cx);
3550    }
3551
3552    pub fn select_to_next_word_boundary(
3553        &mut self,
3554        _: &SelectToNextWordBoundary,
3555        cx: &mut ViewContext<Self>,
3556    ) {
3557        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3558        let mut selections = self.local_selections::<Point>(cx);
3559        for selection in &mut selections {
3560            let head = selection.head().to_display_point(&display_map);
3561            let cursor = movement::next_word_boundary(&display_map, head).to_point(&display_map);
3562            selection.set_head(cursor);
3563            selection.goal = SelectionGoal::None;
3564        }
3565        self.update_selections(selections, Some(Autoscroll::Fit), cx);
3566    }
3567
3568    pub fn delete_to_next_word_boundary(
3569        &mut self,
3570        _: &DeleteToNextWordBoundary,
3571        cx: &mut ViewContext<Self>,
3572    ) {
3573        self.start_transaction(cx);
3574        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3575        let mut selections = self.local_selections::<Point>(cx);
3576        for selection in &mut selections {
3577            if selection.is_empty() {
3578                let head = selection.head().to_display_point(&display_map);
3579                let cursor =
3580                    movement::next_word_boundary(&display_map, head).to_point(&display_map);
3581                selection.set_head(cursor);
3582                selection.goal = SelectionGoal::None;
3583            }
3584        }
3585        self.update_selections(selections, Some(Autoscroll::Fit), cx);
3586        self.insert("", cx);
3587        self.end_transaction(cx);
3588    }
3589
3590    pub fn move_to_beginning_of_line(
3591        &mut self,
3592        _: &MoveToBeginningOfLine,
3593        cx: &mut ViewContext<Self>,
3594    ) {
3595        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3596        let mut selections = self.local_selections::<Point>(cx);
3597        for selection in &mut selections {
3598            let head = selection.head().to_display_point(&display_map);
3599            let new_head = movement::line_beginning(&display_map, head, true);
3600            let cursor = new_head.to_point(&display_map);
3601            selection.start = cursor;
3602            selection.end = cursor;
3603            selection.reversed = false;
3604            selection.goal = SelectionGoal::None;
3605        }
3606        self.update_selections(selections, Some(Autoscroll::Fit), cx);
3607    }
3608
3609    pub fn select_to_beginning_of_line(
3610        &mut self,
3611        SelectToBeginningOfLine(stop_at_soft_boundaries): &SelectToBeginningOfLine,
3612        cx: &mut ViewContext<Self>,
3613    ) {
3614        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3615        let mut selections = self.local_selections::<Point>(cx);
3616        for selection in &mut selections {
3617            let head = selection.head().to_display_point(&display_map);
3618            let new_head = movement::line_beginning(&display_map, head, *stop_at_soft_boundaries);
3619            selection.set_head(new_head.to_point(&display_map));
3620            selection.goal = SelectionGoal::None;
3621        }
3622        self.update_selections(selections, Some(Autoscroll::Fit), cx);
3623    }
3624
3625    pub fn delete_to_beginning_of_line(
3626        &mut self,
3627        _: &DeleteToBeginningOfLine,
3628        cx: &mut ViewContext<Self>,
3629    ) {
3630        self.start_transaction(cx);
3631        self.select_to_beginning_of_line(&SelectToBeginningOfLine(false), cx);
3632        self.backspace(&Backspace, cx);
3633        self.end_transaction(cx);
3634    }
3635
3636    pub fn move_to_end_of_line(&mut self, _: &MoveToEndOfLine, cx: &mut ViewContext<Self>) {
3637        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3638        let mut selections = self.local_selections::<Point>(cx);
3639        {
3640            for selection in &mut selections {
3641                let head = selection.head().to_display_point(&display_map);
3642                let new_head = movement::line_end(&display_map, head, true);
3643                let anchor = new_head.to_point(&display_map);
3644                selection.start = anchor.clone();
3645                selection.end = anchor;
3646                selection.reversed = false;
3647                selection.goal = SelectionGoal::None;
3648            }
3649        }
3650        self.update_selections(selections, Some(Autoscroll::Fit), cx);
3651    }
3652
3653    pub fn select_to_end_of_line(
3654        &mut self,
3655        SelectToEndOfLine(stop_at_soft_boundaries): &SelectToEndOfLine,
3656        cx: &mut ViewContext<Self>,
3657    ) {
3658        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3659        let mut selections = self.local_selections::<Point>(cx);
3660        for selection in &mut selections {
3661            let head = selection.head().to_display_point(&display_map);
3662            let new_head = movement::line_end(&display_map, head, *stop_at_soft_boundaries);
3663            selection.set_head(new_head.to_point(&display_map));
3664            selection.goal = SelectionGoal::None;
3665        }
3666        self.update_selections(selections, Some(Autoscroll::Fit), cx);
3667    }
3668
3669    pub fn delete_to_end_of_line(&mut self, _: &DeleteToEndOfLine, cx: &mut ViewContext<Self>) {
3670        self.start_transaction(cx);
3671        self.select_to_end_of_line(&SelectToEndOfLine(false), cx);
3672        self.delete(&Delete, cx);
3673        self.end_transaction(cx);
3674    }
3675
3676    pub fn cut_to_end_of_line(&mut self, _: &CutToEndOfLine, cx: &mut ViewContext<Self>) {
3677        self.start_transaction(cx);
3678        self.select_to_end_of_line(&SelectToEndOfLine(false), cx);
3679        self.cut(&Cut, cx);
3680        self.end_transaction(cx);
3681    }
3682
3683    pub fn move_to_beginning(&mut self, _: &MoveToBeginning, cx: &mut ViewContext<Self>) {
3684        if matches!(self.mode, EditorMode::SingleLine) {
3685            cx.propagate_action();
3686            return;
3687        }
3688
3689        let selection = Selection {
3690            id: post_inc(&mut self.next_selection_id),
3691            start: 0,
3692            end: 0,
3693            reversed: false,
3694            goal: SelectionGoal::None,
3695        };
3696        self.update_selections(vec![selection], Some(Autoscroll::Fit), cx);
3697    }
3698
3699    pub fn select_to_beginning(&mut self, _: &SelectToBeginning, cx: &mut ViewContext<Self>) {
3700        let mut selection = self.local_selections::<Point>(cx).last().unwrap().clone();
3701        selection.set_head(Point::zero());
3702        self.update_selections(vec![selection], Some(Autoscroll::Fit), cx);
3703    }
3704
3705    pub fn move_to_end(&mut self, _: &MoveToEnd, cx: &mut ViewContext<Self>) {
3706        if matches!(self.mode, EditorMode::SingleLine) {
3707            cx.propagate_action();
3708            return;
3709        }
3710
3711        let cursor = self.buffer.read(cx).read(cx).len();
3712        let selection = Selection {
3713            id: post_inc(&mut self.next_selection_id),
3714            start: cursor,
3715            end: cursor,
3716            reversed: false,
3717            goal: SelectionGoal::None,
3718        };
3719        self.update_selections(vec![selection], Some(Autoscroll::Fit), cx);
3720    }
3721
3722    pub fn set_nav_history(&mut self, nav_history: Option<ItemNavHistory>) {
3723        self.nav_history = nav_history;
3724    }
3725
3726    pub fn nav_history(&self) -> Option<&ItemNavHistory> {
3727        self.nav_history.as_ref()
3728    }
3729
3730    fn push_to_nav_history(
3731        &self,
3732        position: Anchor,
3733        new_position: Option<Point>,
3734        cx: &mut ViewContext<Self>,
3735    ) {
3736        if let Some(nav_history) = &self.nav_history {
3737            let buffer = self.buffer.read(cx).read(cx);
3738            let offset = position.to_offset(&buffer);
3739            let point = position.to_point(&buffer);
3740            drop(buffer);
3741
3742            if let Some(new_position) = new_position {
3743                let row_delta = (new_position.row as i64 - point.row as i64).abs();
3744                if row_delta < MIN_NAVIGATION_HISTORY_ROW_DELTA {
3745                    return;
3746                }
3747            }
3748
3749            nav_history.push(Some(NavigationData {
3750                anchor: position,
3751                offset,
3752            }));
3753        }
3754    }
3755
3756    pub fn select_to_end(&mut self, _: &SelectToEnd, cx: &mut ViewContext<Self>) {
3757        let mut selection = self.local_selections::<usize>(cx).first().unwrap().clone();
3758        selection.set_head(self.buffer.read(cx).read(cx).len());
3759        self.update_selections(vec![selection], Some(Autoscroll::Fit), cx);
3760    }
3761
3762    pub fn select_all(&mut self, _: &SelectAll, cx: &mut ViewContext<Self>) {
3763        let selection = Selection {
3764            id: post_inc(&mut self.next_selection_id),
3765            start: 0,
3766            end: self.buffer.read(cx).read(cx).len(),
3767            reversed: false,
3768            goal: SelectionGoal::None,
3769        };
3770        self.update_selections(vec![selection], None, cx);
3771    }
3772
3773    pub fn select_line(&mut self, _: &SelectLine, cx: &mut ViewContext<Self>) {
3774        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3775        let mut selections = self.local_selections::<Point>(cx);
3776        let max_point = display_map.buffer_snapshot.max_point();
3777        for selection in &mut selections {
3778            let rows = selection.spanned_rows(true, &display_map);
3779            selection.start = Point::new(rows.start, 0);
3780            selection.end = cmp::min(max_point, Point::new(rows.end, 0));
3781            selection.reversed = false;
3782        }
3783        self.update_selections(selections, Some(Autoscroll::Fit), cx);
3784    }
3785
3786    pub fn split_selection_into_lines(
3787        &mut self,
3788        _: &SplitSelectionIntoLines,
3789        cx: &mut ViewContext<Self>,
3790    ) {
3791        let mut to_unfold = Vec::new();
3792        let mut new_selections = Vec::new();
3793        {
3794            let selections = self.local_selections::<Point>(cx);
3795            let buffer = self.buffer.read(cx).read(cx);
3796            for selection in selections {
3797                for row in selection.start.row..selection.end.row {
3798                    let cursor = Point::new(row, buffer.line_len(row));
3799                    new_selections.push(Selection {
3800                        id: post_inc(&mut self.next_selection_id),
3801                        start: cursor,
3802                        end: cursor,
3803                        reversed: false,
3804                        goal: SelectionGoal::None,
3805                    });
3806                }
3807                new_selections.push(Selection {
3808                    id: selection.id,
3809                    start: selection.end,
3810                    end: selection.end,
3811                    reversed: false,
3812                    goal: SelectionGoal::None,
3813                });
3814                to_unfold.push(selection.start..selection.end);
3815            }
3816        }
3817        self.unfold_ranges(to_unfold, cx);
3818        self.update_selections(new_selections, Some(Autoscroll::Fit), cx);
3819    }
3820
3821    pub fn add_selection_above(&mut self, _: &AddSelectionAbove, cx: &mut ViewContext<Self>) {
3822        self.add_selection(true, cx);
3823    }
3824
3825    pub fn add_selection_below(&mut self, _: &AddSelectionBelow, cx: &mut ViewContext<Self>) {
3826        self.add_selection(false, cx);
3827    }
3828
3829    fn add_selection(&mut self, above: bool, cx: &mut ViewContext<Self>) {
3830        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3831        let mut selections = self.local_selections::<Point>(cx);
3832        let mut state = self.add_selections_state.take().unwrap_or_else(|| {
3833            let oldest_selection = selections.iter().min_by_key(|s| s.id).unwrap().clone();
3834            let range = oldest_selection.display_range(&display_map).sorted();
3835            let columns = cmp::min(range.start.column(), range.end.column())
3836                ..cmp::max(range.start.column(), range.end.column());
3837
3838            selections.clear();
3839            let mut stack = Vec::new();
3840            for row in range.start.row()..=range.end.row() {
3841                if let Some(selection) = self.build_columnar_selection(
3842                    &display_map,
3843                    row,
3844                    &columns,
3845                    oldest_selection.reversed,
3846                ) {
3847                    stack.push(selection.id);
3848                    selections.push(selection);
3849                }
3850            }
3851
3852            if above {
3853                stack.reverse();
3854            }
3855
3856            AddSelectionsState { above, stack }
3857        });
3858
3859        let last_added_selection = *state.stack.last().unwrap();
3860        let mut new_selections = Vec::new();
3861        if above == state.above {
3862            let end_row = if above {
3863                0
3864            } else {
3865                display_map.max_point().row()
3866            };
3867
3868            'outer: for selection in selections {
3869                if selection.id == last_added_selection {
3870                    let range = selection.display_range(&display_map).sorted();
3871                    debug_assert_eq!(range.start.row(), range.end.row());
3872                    let mut row = range.start.row();
3873                    let columns = if let SelectionGoal::ColumnRange { start, end } = selection.goal
3874                    {
3875                        start..end
3876                    } else {
3877                        cmp::min(range.start.column(), range.end.column())
3878                            ..cmp::max(range.start.column(), range.end.column())
3879                    };
3880
3881                    while row != end_row {
3882                        if above {
3883                            row -= 1;
3884                        } else {
3885                            row += 1;
3886                        }
3887
3888                        if let Some(new_selection) = self.build_columnar_selection(
3889                            &display_map,
3890                            row,
3891                            &columns,
3892                            selection.reversed,
3893                        ) {
3894                            state.stack.push(new_selection.id);
3895                            if above {
3896                                new_selections.push(new_selection);
3897                                new_selections.push(selection);
3898                            } else {
3899                                new_selections.push(selection);
3900                                new_selections.push(new_selection);
3901                            }
3902
3903                            continue 'outer;
3904                        }
3905                    }
3906                }
3907
3908                new_selections.push(selection);
3909            }
3910        } else {
3911            new_selections = selections;
3912            new_selections.retain(|s| s.id != last_added_selection);
3913            state.stack.pop();
3914        }
3915
3916        self.update_selections(new_selections, Some(Autoscroll::Fit), cx);
3917        if state.stack.len() > 1 {
3918            self.add_selections_state = Some(state);
3919        }
3920    }
3921
3922    pub fn select_next(&mut self, action: &SelectNext, cx: &mut ViewContext<Self>) {
3923        let replace_newest = action.0;
3924        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3925        let buffer = &display_map.buffer_snapshot;
3926        let mut selections = self.local_selections::<usize>(cx);
3927        if let Some(mut select_next_state) = self.select_next_state.take() {
3928            let query = &select_next_state.query;
3929            if !select_next_state.done {
3930                let first_selection = selections.iter().min_by_key(|s| s.id).unwrap();
3931                let last_selection = selections.iter().max_by_key(|s| s.id).unwrap();
3932                let mut next_selected_range = None;
3933
3934                let bytes_after_last_selection =
3935                    buffer.bytes_in_range(last_selection.end..buffer.len());
3936                let bytes_before_first_selection = buffer.bytes_in_range(0..first_selection.start);
3937                let query_matches = query
3938                    .stream_find_iter(bytes_after_last_selection)
3939                    .map(|result| (last_selection.end, result))
3940                    .chain(
3941                        query
3942                            .stream_find_iter(bytes_before_first_selection)
3943                            .map(|result| (0, result)),
3944                    );
3945                for (start_offset, query_match) in query_matches {
3946                    let query_match = query_match.unwrap(); // can only fail due to I/O
3947                    let offset_range =
3948                        start_offset + query_match.start()..start_offset + query_match.end();
3949                    let display_range = offset_range.start.to_display_point(&display_map)
3950                        ..offset_range.end.to_display_point(&display_map);
3951
3952                    if !select_next_state.wordwise
3953                        || (!movement::is_inside_word(&display_map, display_range.start)
3954                            && !movement::is_inside_word(&display_map, display_range.end))
3955                    {
3956                        next_selected_range = Some(offset_range);
3957                        break;
3958                    }
3959                }
3960
3961                if let Some(next_selected_range) = next_selected_range {
3962                    if replace_newest {
3963                        if let Some(newest_id) =
3964                            selections.iter().max_by_key(|s| s.id).map(|s| s.id)
3965                        {
3966                            selections.retain(|s| s.id != newest_id);
3967                        }
3968                    }
3969                    selections.push(Selection {
3970                        id: post_inc(&mut self.next_selection_id),
3971                        start: next_selected_range.start,
3972                        end: next_selected_range.end,
3973                        reversed: false,
3974                        goal: SelectionGoal::None,
3975                    });
3976                    self.update_selections(selections, Some(Autoscroll::Newest), cx);
3977                } else {
3978                    select_next_state.done = true;
3979                }
3980            }
3981
3982            self.select_next_state = Some(select_next_state);
3983        } else if selections.len() == 1 {
3984            let selection = selections.last_mut().unwrap();
3985            if selection.start == selection.end {
3986                let word_range = movement::surrounding_word(
3987                    &display_map,
3988                    selection.start.to_display_point(&display_map),
3989                );
3990                selection.start = word_range.start.to_offset(&display_map, Bias::Left);
3991                selection.end = word_range.end.to_offset(&display_map, Bias::Left);
3992                selection.goal = SelectionGoal::None;
3993                selection.reversed = false;
3994
3995                let query = buffer
3996                    .text_for_range(selection.start..selection.end)
3997                    .collect::<String>();
3998                let select_state = SelectNextState {
3999                    query: AhoCorasick::new_auto_configured(&[query]),
4000                    wordwise: true,
4001                    done: false,
4002                };
4003                self.update_selections(selections, Some(Autoscroll::Newest), cx);
4004                self.select_next_state = Some(select_state);
4005            } else {
4006                let query = buffer
4007                    .text_for_range(selection.start..selection.end)
4008                    .collect::<String>();
4009                self.select_next_state = Some(SelectNextState {
4010                    query: AhoCorasick::new_auto_configured(&[query]),
4011                    wordwise: false,
4012                    done: false,
4013                });
4014                self.select_next(action, cx);
4015            }
4016        }
4017    }
4018
4019    pub fn toggle_comments(&mut self, _: &ToggleComments, cx: &mut ViewContext<Self>) {
4020        // Get the line comment prefix. Split its trailing whitespace into a separate string,
4021        // as that portion won't be used for detecting if a line is a comment.
4022        let full_comment_prefix =
4023            if let Some(prefix) = self.language(cx).and_then(|l| l.line_comment_prefix()) {
4024                prefix.to_string()
4025            } else {
4026                return;
4027            };
4028        let comment_prefix = full_comment_prefix.trim_end_matches(' ');
4029        let comment_prefix_whitespace = &full_comment_prefix[comment_prefix.len()..];
4030
4031        self.start_transaction(cx);
4032        let mut selections = self.local_selections::<Point>(cx);
4033        let mut all_selection_lines_are_comments = true;
4034        let mut edit_ranges = Vec::new();
4035        let mut last_toggled_row = None;
4036        self.buffer.update(cx, |buffer, cx| {
4037            for selection in &mut selections {
4038                edit_ranges.clear();
4039                let snapshot = buffer.snapshot(cx);
4040
4041                let end_row =
4042                    if selection.end.row > selection.start.row && selection.end.column == 0 {
4043                        selection.end.row
4044                    } else {
4045                        selection.end.row + 1
4046                    };
4047
4048                for row in selection.start.row..end_row {
4049                    // If multiple selections contain a given row, avoid processing that
4050                    // row more than once.
4051                    if last_toggled_row == Some(row) {
4052                        continue;
4053                    } else {
4054                        last_toggled_row = Some(row);
4055                    }
4056
4057                    if snapshot.is_line_blank(row) {
4058                        continue;
4059                    }
4060
4061                    let start = Point::new(row, snapshot.indent_column_for_line(row));
4062                    let mut line_bytes = snapshot
4063                        .bytes_in_range(start..snapshot.max_point())
4064                        .flatten()
4065                        .copied();
4066
4067                    // If this line currently begins with the line comment prefix, then record
4068                    // the range containing the prefix.
4069                    if all_selection_lines_are_comments
4070                        && line_bytes
4071                            .by_ref()
4072                            .take(comment_prefix.len())
4073                            .eq(comment_prefix.bytes())
4074                    {
4075                        // Include any whitespace that matches the comment prefix.
4076                        let matching_whitespace_len = line_bytes
4077                            .zip(comment_prefix_whitespace.bytes())
4078                            .take_while(|(a, b)| a == b)
4079                            .count() as u32;
4080                        let end = Point::new(
4081                            row,
4082                            start.column + comment_prefix.len() as u32 + matching_whitespace_len,
4083                        );
4084                        edit_ranges.push(start..end);
4085                    }
4086                    // If this line does not begin with the line comment prefix, then record
4087                    // the position where the prefix should be inserted.
4088                    else {
4089                        all_selection_lines_are_comments = false;
4090                        edit_ranges.push(start..start);
4091                    }
4092                }
4093
4094                if !edit_ranges.is_empty() {
4095                    if all_selection_lines_are_comments {
4096                        buffer.edit(edit_ranges.iter().cloned(), "", cx);
4097                    } else {
4098                        let min_column = edit_ranges.iter().map(|r| r.start.column).min().unwrap();
4099                        let edit_ranges = edit_ranges.iter().map(|range| {
4100                            let position = Point::new(range.start.row, min_column);
4101                            position..position
4102                        });
4103                        buffer.edit(edit_ranges, &full_comment_prefix, cx);
4104                    }
4105                }
4106            }
4107        });
4108
4109        self.update_selections(
4110            self.local_selections::<usize>(cx),
4111            Some(Autoscroll::Fit),
4112            cx,
4113        );
4114        self.end_transaction(cx);
4115    }
4116
4117    pub fn select_larger_syntax_node(
4118        &mut self,
4119        _: &SelectLargerSyntaxNode,
4120        cx: &mut ViewContext<Self>,
4121    ) {
4122        let old_selections = self.local_selections::<usize>(cx).into_boxed_slice();
4123        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
4124        let buffer = self.buffer.read(cx).snapshot(cx);
4125
4126        let mut stack = mem::take(&mut self.select_larger_syntax_node_stack);
4127        let mut selected_larger_node = false;
4128        let new_selections = old_selections
4129            .iter()
4130            .map(|selection| {
4131                let old_range = selection.start..selection.end;
4132                let mut new_range = old_range.clone();
4133                while let Some(containing_range) =
4134                    buffer.range_for_syntax_ancestor(new_range.clone())
4135                {
4136                    new_range = containing_range;
4137                    if !display_map.intersects_fold(new_range.start)
4138                        && !display_map.intersects_fold(new_range.end)
4139                    {
4140                        break;
4141                    }
4142                }
4143
4144                selected_larger_node |= new_range != old_range;
4145                Selection {
4146                    id: selection.id,
4147                    start: new_range.start,
4148                    end: new_range.end,
4149                    goal: SelectionGoal::None,
4150                    reversed: selection.reversed,
4151                }
4152            })
4153            .collect::<Vec<_>>();
4154
4155        if selected_larger_node {
4156            stack.push(old_selections);
4157            self.update_selections(new_selections, Some(Autoscroll::Fit), cx);
4158        }
4159        self.select_larger_syntax_node_stack = stack;
4160    }
4161
4162    pub fn select_smaller_syntax_node(
4163        &mut self,
4164        _: &SelectSmallerSyntaxNode,
4165        cx: &mut ViewContext<Self>,
4166    ) {
4167        let mut stack = mem::take(&mut self.select_larger_syntax_node_stack);
4168        if let Some(selections) = stack.pop() {
4169            self.update_selections(selections.to_vec(), Some(Autoscroll::Fit), cx);
4170        }
4171        self.select_larger_syntax_node_stack = stack;
4172    }
4173
4174    pub fn move_to_enclosing_bracket(
4175        &mut self,
4176        _: &MoveToEnclosingBracket,
4177        cx: &mut ViewContext<Self>,
4178    ) {
4179        let mut selections = self.local_selections::<usize>(cx);
4180        let buffer = self.buffer.read(cx).snapshot(cx);
4181        for selection in &mut selections {
4182            if let Some((open_range, close_range)) =
4183                buffer.enclosing_bracket_ranges(selection.start..selection.end)
4184            {
4185                let close_range = close_range.to_inclusive();
4186                let destination = if close_range.contains(&selection.start)
4187                    && close_range.contains(&selection.end)
4188                {
4189                    open_range.end
4190                } else {
4191                    *close_range.start()
4192                };
4193                selection.start = destination;
4194                selection.end = destination;
4195            }
4196        }
4197
4198        self.update_selections(selections, Some(Autoscroll::Fit), cx);
4199    }
4200
4201    pub fn show_next_diagnostic(&mut self, _: &ShowNextDiagnostic, cx: &mut ViewContext<Self>) {
4202        let buffer = self.buffer.read(cx).snapshot(cx);
4203        let selection = self.newest_selection_with_snapshot::<usize>(&buffer);
4204        let mut active_primary_range = self.active_diagnostics.as_ref().map(|active_diagnostics| {
4205            active_diagnostics
4206                .primary_range
4207                .to_offset(&buffer)
4208                .to_inclusive()
4209        });
4210        let mut search_start = if let Some(active_primary_range) = active_primary_range.as_ref() {
4211            if active_primary_range.contains(&selection.head()) {
4212                *active_primary_range.end()
4213            } else {
4214                selection.head()
4215            }
4216        } else {
4217            selection.head()
4218        };
4219
4220        loop {
4221            let next_group = buffer
4222                .diagnostics_in_range::<_, usize>(search_start..buffer.len())
4223                .find_map(|entry| {
4224                    if entry.diagnostic.is_primary
4225                        && !entry.range.is_empty()
4226                        && Some(entry.range.end) != active_primary_range.as_ref().map(|r| *r.end())
4227                    {
4228                        Some((entry.range, entry.diagnostic.group_id))
4229                    } else {
4230                        None
4231                    }
4232                });
4233
4234            if let Some((primary_range, group_id)) = next_group {
4235                self.activate_diagnostics(group_id, cx);
4236                self.update_selections(
4237                    vec![Selection {
4238                        id: selection.id,
4239                        start: primary_range.start,
4240                        end: primary_range.start,
4241                        reversed: false,
4242                        goal: SelectionGoal::None,
4243                    }],
4244                    Some(Autoscroll::Center),
4245                    cx,
4246                );
4247                break;
4248            } else if search_start == 0 {
4249                break;
4250            } else {
4251                // Cycle around to the start of the buffer, potentially moving back to the start of
4252                // the currently active diagnostic.
4253                search_start = 0;
4254                active_primary_range.take();
4255            }
4256        }
4257    }
4258
4259    pub fn go_to_definition(
4260        workspace: &mut Workspace,
4261        _: &GoToDefinition,
4262        cx: &mut ViewContext<Workspace>,
4263    ) {
4264        let active_item = workspace.active_item(cx);
4265        let editor_handle = if let Some(editor) = active_item
4266            .as_ref()
4267            .and_then(|item| item.act_as::<Self>(cx))
4268        {
4269            editor
4270        } else {
4271            return;
4272        };
4273
4274        let editor = editor_handle.read(cx);
4275        let head = editor.newest_selection::<usize>(cx).head();
4276        let (buffer, head) =
4277            if let Some(text_anchor) = editor.buffer.read(cx).text_anchor_for_position(head, cx) {
4278                text_anchor
4279            } else {
4280                return;
4281            };
4282
4283        let definitions = workspace
4284            .project()
4285            .update(cx, |project, cx| project.definition(&buffer, head, cx));
4286        cx.spawn(|workspace, mut cx| async move {
4287            let definitions = definitions.await?;
4288            workspace.update(&mut cx, |workspace, cx| {
4289                let nav_history = workspace.active_pane().read(cx).nav_history().clone();
4290                for definition in definitions {
4291                    let range = definition.range.to_offset(definition.buffer.read(cx));
4292                    let target_editor_handle = workspace
4293                        .open_item(BufferItemHandle(definition.buffer), cx)
4294                        .downcast::<Self>()
4295                        .unwrap();
4296
4297                    target_editor_handle.update(cx, |target_editor, cx| {
4298                        // When selecting a definition in a different buffer, disable the nav history
4299                        // to avoid creating a history entry at the previous cursor location.
4300                        if editor_handle != target_editor_handle {
4301                            nav_history.borrow_mut().disable();
4302                        }
4303                        target_editor.select_ranges([range], Some(Autoscroll::Center), cx);
4304                        nav_history.borrow_mut().enable();
4305                    });
4306                }
4307            });
4308
4309            Ok::<(), anyhow::Error>(())
4310        })
4311        .detach_and_log_err(cx);
4312    }
4313
4314    pub fn find_all_references(
4315        workspace: &mut Workspace,
4316        _: &FindAllReferences,
4317        cx: &mut ViewContext<Workspace>,
4318    ) -> Option<Task<Result<()>>> {
4319        let active_item = workspace.active_item(cx)?;
4320        let editor_handle = active_item.act_as::<Self>(cx)?;
4321
4322        let editor = editor_handle.read(cx);
4323        let head = editor.newest_selection::<usize>(cx).head();
4324        let (buffer, head) = editor.buffer.read(cx).text_anchor_for_position(head, cx)?;
4325        let replica_id = editor.replica_id(cx);
4326
4327        let references = workspace
4328            .project()
4329            .update(cx, |project, cx| project.references(&buffer, head, cx));
4330        Some(cx.spawn(|workspace, mut cx| async move {
4331            let mut locations = references.await?;
4332            if locations.is_empty() {
4333                return Ok(());
4334            }
4335
4336            locations.sort_by_key(|location| location.buffer.id());
4337            let mut locations = locations.into_iter().peekable();
4338            let mut ranges_to_highlight = Vec::new();
4339
4340            let excerpt_buffer = cx.add_model(|cx| {
4341                let mut symbol_name = None;
4342                let mut multibuffer = MultiBuffer::new(replica_id);
4343                while let Some(location) = locations.next() {
4344                    let buffer = location.buffer.read(cx);
4345                    let mut ranges_for_buffer = Vec::new();
4346                    let range = location.range.to_offset(buffer);
4347                    ranges_for_buffer.push(range.clone());
4348                    if symbol_name.is_none() {
4349                        symbol_name = Some(buffer.text_for_range(range).collect::<String>());
4350                    }
4351
4352                    while let Some(next_location) = locations.peek() {
4353                        if next_location.buffer == location.buffer {
4354                            ranges_for_buffer.push(next_location.range.to_offset(buffer));
4355                            locations.next();
4356                        } else {
4357                            break;
4358                        }
4359                    }
4360
4361                    ranges_for_buffer.sort_by_key(|range| (range.start, Reverse(range.end)));
4362                    ranges_to_highlight.extend(multibuffer.push_excerpts_with_context_lines(
4363                        location.buffer.clone(),
4364                        ranges_for_buffer,
4365                        1,
4366                        cx,
4367                    ));
4368                }
4369                multibuffer.with_title(format!("References to `{}`", symbol_name.unwrap()))
4370            });
4371
4372            workspace.update(&mut cx, |workspace, cx| {
4373                let editor = workspace.open_item(MultiBufferItemHandle(excerpt_buffer), cx);
4374                if let Some(editor) = editor.act_as::<Self>(cx) {
4375                    editor.update(cx, |editor, cx| {
4376                        let color = editor.style(cx).highlighted_line_background;
4377                        editor.highlight_background::<Self>(ranges_to_highlight, color, cx);
4378                    });
4379                }
4380            });
4381
4382            Ok(())
4383        }))
4384    }
4385
4386    pub fn rename(&mut self, _: &Rename, cx: &mut ViewContext<Self>) -> Option<Task<Result<()>>> {
4387        use language::ToOffset as _;
4388
4389        let project = self.project.clone()?;
4390        let selection = self.newest_anchor_selection().clone();
4391        let (cursor_buffer, cursor_buffer_position) = self
4392            .buffer
4393            .read(cx)
4394            .text_anchor_for_position(selection.head(), cx)?;
4395        let (tail_buffer, _) = self
4396            .buffer
4397            .read(cx)
4398            .text_anchor_for_position(selection.tail(), cx)?;
4399        if tail_buffer != cursor_buffer {
4400            return None;
4401        }
4402
4403        let snapshot = cursor_buffer.read(cx).snapshot();
4404        let cursor_buffer_offset = cursor_buffer_position.to_offset(&snapshot);
4405        let prepare_rename = project.update(cx, |project, cx| {
4406            project.prepare_rename(cursor_buffer, cursor_buffer_offset, cx)
4407        });
4408
4409        Some(cx.spawn(|this, mut cx| async move {
4410            if let Some(rename_range) = prepare_rename.await? {
4411                let rename_buffer_range = rename_range.to_offset(&snapshot);
4412                let cursor_offset_in_rename_range =
4413                    cursor_buffer_offset.saturating_sub(rename_buffer_range.start);
4414
4415                this.update(&mut cx, |this, cx| {
4416                    this.take_rename(false, cx);
4417                    let style = this.style(cx);
4418                    let buffer = this.buffer.read(cx).read(cx);
4419                    let cursor_offset = selection.head().to_offset(&buffer);
4420                    let rename_start = cursor_offset.saturating_sub(cursor_offset_in_rename_range);
4421                    let rename_end = rename_start + rename_buffer_range.len();
4422                    let range = buffer.anchor_before(rename_start)..buffer.anchor_after(rename_end);
4423                    let mut old_highlight_id = None;
4424                    let old_name = buffer
4425                        .chunks(rename_start..rename_end, true)
4426                        .map(|chunk| {
4427                            if old_highlight_id.is_none() {
4428                                old_highlight_id = chunk.syntax_highlight_id;
4429                            }
4430                            chunk.text
4431                        })
4432                        .collect();
4433
4434                    drop(buffer);
4435
4436                    // Position the selection in the rename editor so that it matches the current selection.
4437                    this.show_local_selections = false;
4438                    let rename_editor = cx.add_view(|cx| {
4439                        let mut editor = Editor::single_line(this.settings.clone(), None, cx);
4440                        if let Some(old_highlight_id) = old_highlight_id {
4441                            editor.override_text_style =
4442                                Some(Box::new(move |style| old_highlight_id.style(&style.syntax)));
4443                        }
4444                        editor
4445                            .buffer
4446                            .update(cx, |buffer, cx| buffer.edit([0..0], &old_name, cx));
4447                        editor.select_all(&SelectAll, cx);
4448                        editor
4449                    });
4450
4451                    let ranges = this
4452                        .clear_background_highlights::<DocumentHighlightWrite>(cx)
4453                        .into_iter()
4454                        .flat_map(|(_, ranges)| ranges)
4455                        .chain(
4456                            this.clear_background_highlights::<DocumentHighlightRead>(cx)
4457                                .into_iter()
4458                                .flat_map(|(_, ranges)| ranges),
4459                        )
4460                        .collect();
4461                    this.highlight_text::<Rename>(
4462                        ranges,
4463                        HighlightStyle {
4464                            fade_out: Some(style.rename_fade),
4465                            ..Default::default()
4466                        },
4467                        cx,
4468                    );
4469                    cx.focus(&rename_editor);
4470                    let block_id = this.insert_blocks(
4471                        [BlockProperties {
4472                            position: range.start.clone(),
4473                            height: 1,
4474                            render: Arc::new({
4475                                let editor = rename_editor.clone();
4476                                move |cx: &BlockContext| {
4477                                    ChildView::new(editor.clone())
4478                                        .contained()
4479                                        .with_padding_left(cx.anchor_x)
4480                                        .boxed()
4481                                }
4482                            }),
4483                            disposition: BlockDisposition::Below,
4484                        }],
4485                        cx,
4486                    )[0];
4487                    this.pending_rename = Some(RenameState {
4488                        range,
4489                        old_name,
4490                        editor: rename_editor,
4491                        block_id,
4492                    });
4493                });
4494            }
4495
4496            Ok(())
4497        }))
4498    }
4499
4500    pub fn confirm_rename(
4501        workspace: &mut Workspace,
4502        _: &ConfirmRename,
4503        cx: &mut ViewContext<Workspace>,
4504    ) -> Option<Task<Result<()>>> {
4505        let editor = workspace.active_item(cx)?.act_as::<Editor>(cx)?;
4506
4507        let (buffer, range, old_name, new_name) = editor.update(cx, |editor, cx| {
4508            let rename = editor.take_rename(false, cx)?;
4509            let buffer = editor.buffer.read(cx);
4510            let (start_buffer, start) =
4511                buffer.text_anchor_for_position(rename.range.start.clone(), cx)?;
4512            let (end_buffer, end) =
4513                buffer.text_anchor_for_position(rename.range.end.clone(), cx)?;
4514            if start_buffer == end_buffer {
4515                let new_name = rename.editor.read(cx).text(cx);
4516                Some((start_buffer, start..end, rename.old_name, new_name))
4517            } else {
4518                None
4519            }
4520        })?;
4521
4522        let rename = workspace.project().clone().update(cx, |project, cx| {
4523            project.perform_rename(
4524                buffer.clone(),
4525                range.start.clone(),
4526                new_name.clone(),
4527                true,
4528                cx,
4529            )
4530        });
4531
4532        Some(cx.spawn(|workspace, mut cx| async move {
4533            let project_transaction = rename.await?;
4534            Self::open_project_transaction(
4535                editor.clone(),
4536                workspace,
4537                project_transaction,
4538                format!("Rename: {} → {}", old_name, new_name),
4539                cx.clone(),
4540            )
4541            .await?;
4542
4543            editor.update(&mut cx, |editor, cx| {
4544                editor.refresh_document_highlights(cx);
4545            });
4546            Ok(())
4547        }))
4548    }
4549
4550    fn take_rename(
4551        &mut self,
4552        moving_cursor: bool,
4553        cx: &mut ViewContext<Self>,
4554    ) -> Option<RenameState> {
4555        let rename = self.pending_rename.take()?;
4556        self.remove_blocks([rename.block_id].into_iter().collect(), cx);
4557        self.clear_text_highlights::<Rename>(cx);
4558        self.show_local_selections = true;
4559
4560        if moving_cursor {
4561            let cursor_in_rename_editor =
4562                rename.editor.read(cx).newest_selection::<usize>(cx).head();
4563
4564            // Update the selection to match the position of the selection inside
4565            // the rename editor.
4566            let snapshot = self.buffer.read(cx).read(cx);
4567            let rename_range = rename.range.to_offset(&snapshot);
4568            let cursor_in_editor = snapshot
4569                .clip_offset(rename_range.start + cursor_in_rename_editor, Bias::Left)
4570                .min(rename_range.end);
4571            drop(snapshot);
4572
4573            self.update_selections(
4574                vec![Selection {
4575                    id: self.newest_anchor_selection().id,
4576                    start: cursor_in_editor,
4577                    end: cursor_in_editor,
4578                    reversed: false,
4579                    goal: SelectionGoal::None,
4580                }],
4581                None,
4582                cx,
4583            );
4584        }
4585
4586        Some(rename)
4587    }
4588
4589    fn invalidate_rename_range(
4590        &mut self,
4591        buffer: &MultiBufferSnapshot,
4592        cx: &mut ViewContext<Self>,
4593    ) {
4594        if let Some(rename) = self.pending_rename.as_ref() {
4595            if self.selections.len() == 1 {
4596                let head = self.selections[0].head().to_offset(buffer);
4597                let range = rename.range.to_offset(buffer).to_inclusive();
4598                if range.contains(&head) {
4599                    return;
4600                }
4601            }
4602            let rename = self.pending_rename.take().unwrap();
4603            self.remove_blocks([rename.block_id].into_iter().collect(), cx);
4604            self.clear_background_highlights::<Rename>(cx);
4605        }
4606    }
4607
4608    #[cfg(any(test, feature = "test-support"))]
4609    pub fn pending_rename(&self) -> Option<&RenameState> {
4610        self.pending_rename.as_ref()
4611    }
4612
4613    fn refresh_active_diagnostics(&mut self, cx: &mut ViewContext<Editor>) {
4614        if let Some(active_diagnostics) = self.active_diagnostics.as_mut() {
4615            let buffer = self.buffer.read(cx).snapshot(cx);
4616            let primary_range_start = active_diagnostics.primary_range.start.to_offset(&buffer);
4617            let is_valid = buffer
4618                .diagnostics_in_range::<_, usize>(active_diagnostics.primary_range.clone())
4619                .any(|entry| {
4620                    entry.diagnostic.is_primary
4621                        && !entry.range.is_empty()
4622                        && entry.range.start == primary_range_start
4623                        && entry.diagnostic.message == active_diagnostics.primary_message
4624                });
4625
4626            if is_valid != active_diagnostics.is_valid {
4627                active_diagnostics.is_valid = is_valid;
4628                let mut new_styles = HashMap::default();
4629                for (block_id, diagnostic) in &active_diagnostics.blocks {
4630                    new_styles.insert(
4631                        *block_id,
4632                        diagnostic_block_renderer(
4633                            diagnostic.clone(),
4634                            is_valid,
4635                            self.settings.clone(),
4636                        ),
4637                    );
4638                }
4639                self.display_map
4640                    .update(cx, |display_map, _| display_map.replace_blocks(new_styles));
4641            }
4642        }
4643    }
4644
4645    fn activate_diagnostics(&mut self, group_id: usize, cx: &mut ViewContext<Self>) {
4646        self.dismiss_diagnostics(cx);
4647        self.active_diagnostics = self.display_map.update(cx, |display_map, cx| {
4648            let buffer = self.buffer.read(cx).snapshot(cx);
4649
4650            let mut primary_range = None;
4651            let mut primary_message = None;
4652            let mut group_end = Point::zero();
4653            let diagnostic_group = buffer
4654                .diagnostic_group::<Point>(group_id)
4655                .map(|entry| {
4656                    if entry.range.end > group_end {
4657                        group_end = entry.range.end;
4658                    }
4659                    if entry.diagnostic.is_primary {
4660                        primary_range = Some(entry.range.clone());
4661                        primary_message = Some(entry.diagnostic.message.clone());
4662                    }
4663                    entry
4664                })
4665                .collect::<Vec<_>>();
4666            let primary_range = primary_range.unwrap();
4667            let primary_message = primary_message.unwrap();
4668            let primary_range =
4669                buffer.anchor_after(primary_range.start)..buffer.anchor_before(primary_range.end);
4670
4671            let blocks = display_map
4672                .insert_blocks(
4673                    diagnostic_group.iter().map(|entry| {
4674                        let diagnostic = entry.diagnostic.clone();
4675                        let message_height = diagnostic.message.lines().count() as u8;
4676                        BlockProperties {
4677                            position: buffer.anchor_after(entry.range.start),
4678                            height: message_height,
4679                            render: diagnostic_block_renderer(
4680                                diagnostic,
4681                                true,
4682                                self.settings.clone(),
4683                            ),
4684                            disposition: BlockDisposition::Below,
4685                        }
4686                    }),
4687                    cx,
4688                )
4689                .into_iter()
4690                .zip(diagnostic_group.into_iter().map(|entry| entry.diagnostic))
4691                .collect();
4692
4693            Some(ActiveDiagnosticGroup {
4694                primary_range,
4695                primary_message,
4696                blocks,
4697                is_valid: true,
4698            })
4699        });
4700    }
4701
4702    fn dismiss_diagnostics(&mut self, cx: &mut ViewContext<Self>) {
4703        if let Some(active_diagnostic_group) = self.active_diagnostics.take() {
4704            self.display_map.update(cx, |display_map, cx| {
4705                display_map.remove_blocks(active_diagnostic_group.blocks.into_keys().collect(), cx);
4706            });
4707            cx.notify();
4708        }
4709    }
4710
4711    fn build_columnar_selection(
4712        &mut self,
4713        display_map: &DisplaySnapshot,
4714        row: u32,
4715        columns: &Range<u32>,
4716        reversed: bool,
4717    ) -> Option<Selection<Point>> {
4718        let is_empty = columns.start == columns.end;
4719        let line_len = display_map.line_len(row);
4720        if columns.start < line_len || (is_empty && columns.start == line_len) {
4721            let start = DisplayPoint::new(row, columns.start);
4722            let end = DisplayPoint::new(row, cmp::min(columns.end, line_len));
4723            Some(Selection {
4724                id: post_inc(&mut self.next_selection_id),
4725                start: start.to_point(display_map),
4726                end: end.to_point(display_map),
4727                reversed,
4728                goal: SelectionGoal::ColumnRange {
4729                    start: columns.start,
4730                    end: columns.end,
4731                },
4732            })
4733        } else {
4734            None
4735        }
4736    }
4737
4738    pub fn local_selections_in_range(
4739        &self,
4740        range: Range<Anchor>,
4741        display_map: &DisplaySnapshot,
4742    ) -> Vec<Selection<Point>> {
4743        let buffer = &display_map.buffer_snapshot;
4744
4745        let start_ix = match self
4746            .selections
4747            .binary_search_by(|probe| probe.end.cmp(&range.start, &buffer).unwrap())
4748        {
4749            Ok(ix) | Err(ix) => ix,
4750        };
4751        let end_ix = match self
4752            .selections
4753            .binary_search_by(|probe| probe.start.cmp(&range.end, &buffer).unwrap())
4754        {
4755            Ok(ix) => ix + 1,
4756            Err(ix) => ix,
4757        };
4758
4759        fn point_selection(
4760            selection: &Selection<Anchor>,
4761            buffer: &MultiBufferSnapshot,
4762        ) -> Selection<Point> {
4763            let start = selection.start.to_point(&buffer);
4764            let end = selection.end.to_point(&buffer);
4765            Selection {
4766                id: selection.id,
4767                start,
4768                end,
4769                reversed: selection.reversed,
4770                goal: selection.goal,
4771            }
4772        }
4773
4774        self.selections[start_ix..end_ix]
4775            .iter()
4776            .chain(
4777                self.pending_selection
4778                    .as_ref()
4779                    .map(|pending| &pending.selection),
4780            )
4781            .map(|s| point_selection(s, &buffer))
4782            .collect()
4783    }
4784
4785    pub fn local_selections<'a, D>(&self, cx: &'a AppContext) -> Vec<Selection<D>>
4786    where
4787        D: 'a + TextDimension + Ord + Sub<D, Output = D>,
4788    {
4789        let buffer = self.buffer.read(cx).snapshot(cx);
4790        let mut selections = self
4791            .resolve_selections::<D, _>(self.selections.iter(), &buffer)
4792            .peekable();
4793
4794        let mut pending_selection = self.pending_selection::<D>(&buffer);
4795
4796        iter::from_fn(move || {
4797            if let Some(pending) = pending_selection.as_mut() {
4798                while let Some(next_selection) = selections.peek() {
4799                    if pending.start <= next_selection.end && pending.end >= next_selection.start {
4800                        let next_selection = selections.next().unwrap();
4801                        if next_selection.start < pending.start {
4802                            pending.start = next_selection.start;
4803                        }
4804                        if next_selection.end > pending.end {
4805                            pending.end = next_selection.end;
4806                        }
4807                    } else if next_selection.end < pending.start {
4808                        return selections.next();
4809                    } else {
4810                        break;
4811                    }
4812                }
4813
4814                pending_selection.take()
4815            } else {
4816                selections.next()
4817            }
4818        })
4819        .collect()
4820    }
4821
4822    fn resolve_selections<'a, D, I>(
4823        &self,
4824        selections: I,
4825        snapshot: &MultiBufferSnapshot,
4826    ) -> impl 'a + Iterator<Item = Selection<D>>
4827    where
4828        D: TextDimension + Ord + Sub<D, Output = D>,
4829        I: 'a + IntoIterator<Item = &'a Selection<Anchor>>,
4830    {
4831        let (to_summarize, selections) = selections.into_iter().tee();
4832        let mut summaries = snapshot
4833            .summaries_for_anchors::<D, _>(to_summarize.flat_map(|s| [&s.start, &s.end]))
4834            .into_iter();
4835        selections.map(move |s| Selection {
4836            id: s.id,
4837            start: summaries.next().unwrap(),
4838            end: summaries.next().unwrap(),
4839            reversed: s.reversed,
4840            goal: s.goal,
4841        })
4842    }
4843
4844    fn pending_selection<D: TextDimension + Ord + Sub<D, Output = D>>(
4845        &self,
4846        snapshot: &MultiBufferSnapshot,
4847    ) -> Option<Selection<D>> {
4848        self.pending_selection
4849            .as_ref()
4850            .map(|pending| self.resolve_selection(&pending.selection, &snapshot))
4851    }
4852
4853    fn resolve_selection<D: TextDimension + Ord + Sub<D, Output = D>>(
4854        &self,
4855        selection: &Selection<Anchor>,
4856        buffer: &MultiBufferSnapshot,
4857    ) -> Selection<D> {
4858        Selection {
4859            id: selection.id,
4860            start: selection.start.summary::<D>(&buffer),
4861            end: selection.end.summary::<D>(&buffer),
4862            reversed: selection.reversed,
4863            goal: selection.goal,
4864        }
4865    }
4866
4867    fn selection_count<'a>(&self) -> usize {
4868        let mut count = self.selections.len();
4869        if self.pending_selection.is_some() {
4870            count += 1;
4871        }
4872        count
4873    }
4874
4875    pub fn oldest_selection<D: TextDimension + Ord + Sub<D, Output = D>>(
4876        &self,
4877        cx: &AppContext,
4878    ) -> Selection<D> {
4879        let snapshot = self.buffer.read(cx).read(cx);
4880        self.selections
4881            .iter()
4882            .min_by_key(|s| s.id)
4883            .map(|selection| self.resolve_selection(selection, &snapshot))
4884            .or_else(|| self.pending_selection(&snapshot))
4885            .unwrap()
4886    }
4887
4888    pub fn newest_selection<D: TextDimension + Ord + Sub<D, Output = D>>(
4889        &self,
4890        cx: &AppContext,
4891    ) -> Selection<D> {
4892        self.resolve_selection(
4893            self.newest_anchor_selection(),
4894            &self.buffer.read(cx).read(cx),
4895        )
4896    }
4897
4898    pub fn newest_selection_with_snapshot<D: TextDimension + Ord + Sub<D, Output = D>>(
4899        &self,
4900        snapshot: &MultiBufferSnapshot,
4901    ) -> Selection<D> {
4902        self.resolve_selection(self.newest_anchor_selection(), snapshot)
4903    }
4904
4905    pub fn newest_anchor_selection(&self) -> &Selection<Anchor> {
4906        self.pending_selection
4907            .as_ref()
4908            .map(|s| &s.selection)
4909            .or_else(|| self.selections.iter().max_by_key(|s| s.id))
4910            .unwrap()
4911    }
4912
4913    pub fn update_selections<T>(
4914        &mut self,
4915        mut selections: Vec<Selection<T>>,
4916        autoscroll: Option<Autoscroll>,
4917        cx: &mut ViewContext<Self>,
4918    ) where
4919        T: ToOffset + ToPoint + Ord + std::marker::Copy + std::fmt::Debug,
4920    {
4921        let buffer = self.buffer.read(cx).snapshot(cx);
4922        selections.sort_unstable_by_key(|s| s.start);
4923
4924        // Merge overlapping selections.
4925        let mut i = 1;
4926        while i < selections.len() {
4927            if selections[i - 1].end >= selections[i].start {
4928                let removed = selections.remove(i);
4929                if removed.start < selections[i - 1].start {
4930                    selections[i - 1].start = removed.start;
4931                }
4932                if removed.end > selections[i - 1].end {
4933                    selections[i - 1].end = removed.end;
4934                }
4935            } else {
4936                i += 1;
4937            }
4938        }
4939
4940        if let Some(autoscroll) = autoscroll {
4941            self.request_autoscroll(autoscroll, cx);
4942        }
4943
4944        self.set_selections(
4945            Arc::from_iter(selections.into_iter().map(|selection| {
4946                let end_bias = if selection.end > selection.start {
4947                    Bias::Left
4948                } else {
4949                    Bias::Right
4950                };
4951                Selection {
4952                    id: selection.id,
4953                    start: buffer.anchor_after(selection.start),
4954                    end: buffer.anchor_at(selection.end, end_bias),
4955                    reversed: selection.reversed,
4956                    goal: selection.goal,
4957                }
4958            })),
4959            None,
4960            cx,
4961        );
4962    }
4963
4964    /// Compute new ranges for any selections that were located in excerpts that have
4965    /// since been removed.
4966    ///
4967    /// Returns a `HashMap` indicating which selections whose former head position
4968    /// was no longer present. The keys of the map are selection ids. The values are
4969    /// the id of the new excerpt where the head of the selection has been moved.
4970    pub fn refresh_selections(&mut self, cx: &mut ViewContext<Self>) -> HashMap<usize, ExcerptId> {
4971        let snapshot = self.buffer.read(cx).read(cx);
4972        let anchors_with_status = snapshot.refresh_anchors(
4973            self.selections
4974                .iter()
4975                .flat_map(|selection| [&selection.start, &selection.end]),
4976        );
4977        let offsets =
4978            snapshot.summaries_for_anchors::<usize, _>(anchors_with_status.iter().map(|a| &a.1));
4979        let offsets = offsets.chunks(2);
4980        let statuses = anchors_with_status
4981            .chunks(2)
4982            .map(|a| (a[0].0 / 2, a[0].2, a[1].2));
4983
4984        let mut selections_with_lost_position = HashMap::default();
4985        let new_selections = offsets
4986            .zip(statuses)
4987            .map(|(offsets, (selection_ix, kept_start, kept_end))| {
4988                let selection = &self.selections[selection_ix];
4989                let kept_head = if selection.reversed {
4990                    kept_start
4991                } else {
4992                    kept_end
4993                };
4994                if !kept_head {
4995                    selections_with_lost_position
4996                        .insert(selection.id, selection.head().excerpt_id.clone());
4997                }
4998
4999                Selection {
5000                    id: selection.id,
5001                    start: offsets[0],
5002                    end: offsets[1],
5003                    reversed: selection.reversed,
5004                    goal: selection.goal,
5005                }
5006            })
5007            .collect();
5008        drop(snapshot);
5009        self.update_selections(new_selections, Some(Autoscroll::Fit), cx);
5010        selections_with_lost_position
5011    }
5012
5013    fn set_selections(
5014        &mut self,
5015        selections: Arc<[Selection<Anchor>]>,
5016        pending_selection: Option<PendingSelection>,
5017        cx: &mut ViewContext<Self>,
5018    ) {
5019        let old_cursor_position = self.newest_anchor_selection().head();
5020
5021        self.selections = selections;
5022        self.pending_selection = pending_selection;
5023        if self.focused {
5024            self.buffer.update(cx, |buffer, cx| {
5025                buffer.set_active_selections(&self.selections, cx)
5026            });
5027        }
5028
5029        let display_map = self
5030            .display_map
5031            .update(cx, |display_map, cx| display_map.snapshot(cx));
5032        let buffer = &display_map.buffer_snapshot;
5033        self.add_selections_state = None;
5034        self.select_next_state = None;
5035        self.select_larger_syntax_node_stack.clear();
5036        self.autoclose_stack.invalidate(&self.selections, &buffer);
5037        self.snippet_stack.invalidate(&self.selections, &buffer);
5038        self.invalidate_rename_range(&buffer, cx);
5039
5040        let new_cursor_position = self.newest_anchor_selection().head();
5041
5042        self.push_to_nav_history(
5043            old_cursor_position.clone(),
5044            Some(new_cursor_position.to_point(&buffer)),
5045            cx,
5046        );
5047
5048        let completion_menu = match self.context_menu.as_mut() {
5049            Some(ContextMenu::Completions(menu)) => Some(menu),
5050            _ => {
5051                self.context_menu.take();
5052                None
5053            }
5054        };
5055
5056        if let Some(completion_menu) = completion_menu {
5057            let cursor_position = new_cursor_position.to_offset(&buffer);
5058            let (word_range, kind) =
5059                buffer.surrounding_word(completion_menu.initial_position.clone());
5060            if kind == Some(CharKind::Word) && word_range.to_inclusive().contains(&cursor_position)
5061            {
5062                let query = Self::completion_query(&buffer, cursor_position);
5063                cx.background()
5064                    .block(completion_menu.filter(query.as_deref(), cx.background().clone()));
5065                self.show_completions(&ShowCompletions, cx);
5066            } else {
5067                self.hide_context_menu(cx);
5068            }
5069        }
5070
5071        if old_cursor_position.to_display_point(&display_map).row()
5072            != new_cursor_position.to_display_point(&display_map).row()
5073        {
5074            self.available_code_actions.take();
5075        }
5076        self.refresh_code_actions(cx);
5077        self.refresh_document_highlights(cx);
5078
5079        self.pause_cursor_blinking(cx);
5080        cx.emit(Event::SelectionsChanged);
5081    }
5082
5083    pub fn request_autoscroll(&mut self, autoscroll: Autoscroll, cx: &mut ViewContext<Self>) {
5084        self.autoscroll_request = Some(autoscroll);
5085        cx.notify();
5086    }
5087
5088    fn start_transaction(&mut self, cx: &mut ViewContext<Self>) {
5089        self.start_transaction_at(Instant::now(), cx);
5090    }
5091
5092    fn start_transaction_at(&mut self, now: Instant, cx: &mut ViewContext<Self>) {
5093        self.end_selection(cx);
5094        if let Some(tx_id) = self
5095            .buffer
5096            .update(cx, |buffer, cx| buffer.start_transaction_at(now, cx))
5097        {
5098            self.selection_history
5099                .insert(tx_id, (self.selections.clone(), None));
5100        }
5101    }
5102
5103    fn end_transaction(&mut self, cx: &mut ViewContext<Self>) {
5104        self.end_transaction_at(Instant::now(), cx);
5105    }
5106
5107    fn end_transaction_at(&mut self, now: Instant, cx: &mut ViewContext<Self>) {
5108        if let Some(tx_id) = self
5109            .buffer
5110            .update(cx, |buffer, cx| buffer.end_transaction_at(now, cx))
5111        {
5112            if let Some((_, end_selections)) = self.selection_history.get_mut(&tx_id) {
5113                *end_selections = Some(self.selections.clone());
5114            } else {
5115                log::error!("unexpectedly ended a transaction that wasn't started by this editor");
5116            }
5117        }
5118    }
5119
5120    pub fn page_up(&mut self, _: &PageUp, _: &mut ViewContext<Self>) {
5121        log::info!("Editor::page_up");
5122    }
5123
5124    pub fn page_down(&mut self, _: &PageDown, _: &mut ViewContext<Self>) {
5125        log::info!("Editor::page_down");
5126    }
5127
5128    pub fn fold(&mut self, _: &Fold, cx: &mut ViewContext<Self>) {
5129        let mut fold_ranges = Vec::new();
5130
5131        let selections = self.local_selections::<Point>(cx);
5132        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
5133        for selection in selections {
5134            let range = selection.display_range(&display_map).sorted();
5135            let buffer_start_row = range.start.to_point(&display_map).row;
5136
5137            for row in (0..=range.end.row()).rev() {
5138                if self.is_line_foldable(&display_map, row) && !display_map.is_line_folded(row) {
5139                    let fold_range = self.foldable_range_for_line(&display_map, row);
5140                    if fold_range.end.row >= buffer_start_row {
5141                        fold_ranges.push(fold_range);
5142                        if row <= range.start.row() {
5143                            break;
5144                        }
5145                    }
5146                }
5147            }
5148        }
5149
5150        self.fold_ranges(fold_ranges, cx);
5151    }
5152
5153    pub fn unfold(&mut self, _: &Unfold, cx: &mut ViewContext<Self>) {
5154        let selections = self.local_selections::<Point>(cx);
5155        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
5156        let buffer = &display_map.buffer_snapshot;
5157        let ranges = selections
5158            .iter()
5159            .map(|s| {
5160                let range = s.display_range(&display_map).sorted();
5161                let mut start = range.start.to_point(&display_map);
5162                let mut end = range.end.to_point(&display_map);
5163                start.column = 0;
5164                end.column = buffer.line_len(end.row);
5165                start..end
5166            })
5167            .collect::<Vec<_>>();
5168        self.unfold_ranges(ranges, cx);
5169    }
5170
5171    fn is_line_foldable(&self, display_map: &DisplaySnapshot, display_row: u32) -> bool {
5172        let max_point = display_map.max_point();
5173        if display_row >= max_point.row() {
5174            false
5175        } else {
5176            let (start_indent, is_blank) = display_map.line_indent(display_row);
5177            if is_blank {
5178                false
5179            } else {
5180                for display_row in display_row + 1..=max_point.row() {
5181                    let (indent, is_blank) = display_map.line_indent(display_row);
5182                    if !is_blank {
5183                        return indent > start_indent;
5184                    }
5185                }
5186                false
5187            }
5188        }
5189    }
5190
5191    fn foldable_range_for_line(
5192        &self,
5193        display_map: &DisplaySnapshot,
5194        start_row: u32,
5195    ) -> Range<Point> {
5196        let max_point = display_map.max_point();
5197
5198        let (start_indent, _) = display_map.line_indent(start_row);
5199        let start = DisplayPoint::new(start_row, display_map.line_len(start_row));
5200        let mut end = None;
5201        for row in start_row + 1..=max_point.row() {
5202            let (indent, is_blank) = display_map.line_indent(row);
5203            if !is_blank && indent <= start_indent {
5204                end = Some(DisplayPoint::new(row - 1, display_map.line_len(row - 1)));
5205                break;
5206            }
5207        }
5208
5209        let end = end.unwrap_or(max_point);
5210        return start.to_point(display_map)..end.to_point(display_map);
5211    }
5212
5213    pub fn fold_selected_ranges(&mut self, _: &FoldSelectedRanges, cx: &mut ViewContext<Self>) {
5214        let selections = self.local_selections::<Point>(cx);
5215        let ranges = selections.into_iter().map(|s| s.start..s.end);
5216        self.fold_ranges(ranges, cx);
5217    }
5218
5219    fn fold_ranges<T: ToOffset>(
5220        &mut self,
5221        ranges: impl IntoIterator<Item = Range<T>>,
5222        cx: &mut ViewContext<Self>,
5223    ) {
5224        let mut ranges = ranges.into_iter().peekable();
5225        if ranges.peek().is_some() {
5226            self.display_map.update(cx, |map, cx| map.fold(ranges, cx));
5227            self.request_autoscroll(Autoscroll::Fit, cx);
5228            cx.notify();
5229        }
5230    }
5231
5232    fn unfold_ranges<T: ToOffset>(&mut self, ranges: Vec<Range<T>>, cx: &mut ViewContext<Self>) {
5233        if !ranges.is_empty() {
5234            self.display_map
5235                .update(cx, |map, cx| map.unfold(ranges, cx));
5236            self.request_autoscroll(Autoscroll::Fit, cx);
5237            cx.notify();
5238        }
5239    }
5240
5241    pub fn insert_blocks(
5242        &mut self,
5243        blocks: impl IntoIterator<Item = BlockProperties<Anchor>>,
5244        cx: &mut ViewContext<Self>,
5245    ) -> Vec<BlockId> {
5246        let blocks = self
5247            .display_map
5248            .update(cx, |display_map, cx| display_map.insert_blocks(blocks, cx));
5249        self.request_autoscroll(Autoscroll::Fit, cx);
5250        blocks
5251    }
5252
5253    pub fn replace_blocks(
5254        &mut self,
5255        blocks: HashMap<BlockId, RenderBlock>,
5256        cx: &mut ViewContext<Self>,
5257    ) {
5258        self.display_map
5259            .update(cx, |display_map, _| display_map.replace_blocks(blocks));
5260        self.request_autoscroll(Autoscroll::Fit, cx);
5261    }
5262
5263    pub fn remove_blocks(&mut self, block_ids: HashSet<BlockId>, cx: &mut ViewContext<Self>) {
5264        self.display_map.update(cx, |display_map, cx| {
5265            display_map.remove_blocks(block_ids, cx)
5266        });
5267    }
5268
5269    pub fn longest_row(&self, cx: &mut MutableAppContext) -> u32 {
5270        self.display_map
5271            .update(cx, |map, cx| map.snapshot(cx))
5272            .longest_row()
5273    }
5274
5275    pub fn max_point(&self, cx: &mut MutableAppContext) -> DisplayPoint {
5276        self.display_map
5277            .update(cx, |map, cx| map.snapshot(cx))
5278            .max_point()
5279    }
5280
5281    pub fn text(&self, cx: &AppContext) -> String {
5282        self.buffer.read(cx).read(cx).text()
5283    }
5284
5285    pub fn set_text(&mut self, text: impl Into<String>, cx: &mut ViewContext<Self>) {
5286        self.buffer
5287            .read(cx)
5288            .as_singleton()
5289            .expect("you can only call set_text on editors for singleton buffers")
5290            .update(cx, |buffer, cx| buffer.set_text(text, cx));
5291    }
5292
5293    pub fn display_text(&self, cx: &mut MutableAppContext) -> String {
5294        self.display_map
5295            .update(cx, |map, cx| map.snapshot(cx))
5296            .text()
5297    }
5298
5299    pub fn soft_wrap_mode(&self, cx: &AppContext) -> SoftWrap {
5300        let language = self.language(cx);
5301        let settings = self.settings.borrow();
5302        let mode = self
5303            .soft_wrap_mode_override
5304            .unwrap_or_else(|| settings.soft_wrap(language));
5305        match mode {
5306            settings::SoftWrap::None => SoftWrap::None,
5307            settings::SoftWrap::EditorWidth => SoftWrap::EditorWidth,
5308            settings::SoftWrap::PreferredLineLength => {
5309                SoftWrap::Column(settings.preferred_line_length(language))
5310            }
5311        }
5312    }
5313
5314    pub fn set_soft_wrap_mode(&mut self, mode: settings::SoftWrap, cx: &mut ViewContext<Self>) {
5315        self.soft_wrap_mode_override = Some(mode);
5316        cx.notify();
5317    }
5318
5319    pub fn set_wrap_width(&self, width: Option<f32>, cx: &mut MutableAppContext) -> bool {
5320        self.display_map
5321            .update(cx, |map, cx| map.set_wrap_width(width, cx))
5322    }
5323
5324    pub fn highlight_rows(&mut self, rows: Option<Range<u32>>) {
5325        self.highlighted_rows = rows;
5326    }
5327
5328    pub fn highlighted_rows(&self) -> Option<Range<u32>> {
5329        self.highlighted_rows.clone()
5330    }
5331
5332    pub fn highlight_background<T: 'static>(
5333        &mut self,
5334        ranges: Vec<Range<Anchor>>,
5335        color: Color,
5336        cx: &mut ViewContext<Self>,
5337    ) {
5338        self.background_highlights
5339            .insert(TypeId::of::<T>(), (color, ranges));
5340        cx.notify();
5341    }
5342
5343    pub fn clear_background_highlights<T: 'static>(
5344        &mut self,
5345        cx: &mut ViewContext<Self>,
5346    ) -> Option<(Color, Vec<Range<Anchor>>)> {
5347        cx.notify();
5348        self.background_highlights.remove(&TypeId::of::<T>())
5349    }
5350
5351    #[cfg(feature = "test-support")]
5352    pub fn all_background_highlights(
5353        &mut self,
5354        cx: &mut ViewContext<Self>,
5355    ) -> Vec<(Range<DisplayPoint>, Color)> {
5356        let snapshot = self.snapshot(cx);
5357        let buffer = &snapshot.buffer_snapshot;
5358        let start = buffer.anchor_before(0);
5359        let end = buffer.anchor_after(buffer.len());
5360        self.background_highlights_in_range(start..end, &snapshot)
5361    }
5362
5363    pub fn background_highlights_for_type<T: 'static>(&self) -> Option<(Color, &[Range<Anchor>])> {
5364        self.background_highlights
5365            .get(&TypeId::of::<T>())
5366            .map(|(color, ranges)| (*color, ranges.as_slice()))
5367    }
5368
5369    pub fn background_highlights_in_range(
5370        &self,
5371        search_range: Range<Anchor>,
5372        display_snapshot: &DisplaySnapshot,
5373    ) -> Vec<(Range<DisplayPoint>, Color)> {
5374        let mut results = Vec::new();
5375        let buffer = &display_snapshot.buffer_snapshot;
5376        for (color, ranges) in self.background_highlights.values() {
5377            let start_ix = match ranges.binary_search_by(|probe| {
5378                let cmp = probe.end.cmp(&search_range.start, &buffer).unwrap();
5379                if cmp.is_gt() {
5380                    Ordering::Greater
5381                } else {
5382                    Ordering::Less
5383                }
5384            }) {
5385                Ok(i) | Err(i) => i,
5386            };
5387            for range in &ranges[start_ix..] {
5388                if range.start.cmp(&search_range.end, &buffer).unwrap().is_ge() {
5389                    break;
5390                }
5391                let start = range
5392                    .start
5393                    .to_point(buffer)
5394                    .to_display_point(display_snapshot);
5395                let end = range
5396                    .end
5397                    .to_point(buffer)
5398                    .to_display_point(display_snapshot);
5399                results.push((start..end, *color))
5400            }
5401        }
5402        results
5403    }
5404
5405    pub fn highlight_text<T: 'static>(
5406        &mut self,
5407        ranges: Vec<Range<Anchor>>,
5408        style: HighlightStyle,
5409        cx: &mut ViewContext<Self>,
5410    ) {
5411        self.display_map.update(cx, |map, _| {
5412            map.highlight_text(TypeId::of::<T>(), ranges, style)
5413        });
5414        cx.notify();
5415    }
5416
5417    pub fn clear_text_highlights<T: 'static>(
5418        &mut self,
5419        cx: &mut ViewContext<Self>,
5420    ) -> Option<Arc<(HighlightStyle, Vec<Range<Anchor>>)>> {
5421        cx.notify();
5422        self.display_map
5423            .update(cx, |map, _| map.clear_text_highlights(TypeId::of::<T>()))
5424    }
5425
5426    fn next_blink_epoch(&mut self) -> usize {
5427        self.blink_epoch += 1;
5428        self.blink_epoch
5429    }
5430
5431    fn pause_cursor_blinking(&mut self, cx: &mut ViewContext<Self>) {
5432        if !self.focused {
5433            return;
5434        }
5435
5436        self.show_local_cursors = true;
5437        cx.notify();
5438
5439        let epoch = self.next_blink_epoch();
5440        cx.spawn(|this, mut cx| {
5441            let this = this.downgrade();
5442            async move {
5443                Timer::after(CURSOR_BLINK_INTERVAL).await;
5444                if let Some(this) = this.upgrade(&cx) {
5445                    this.update(&mut cx, |this, cx| this.resume_cursor_blinking(epoch, cx))
5446                }
5447            }
5448        })
5449        .detach();
5450    }
5451
5452    fn resume_cursor_blinking(&mut self, epoch: usize, cx: &mut ViewContext<Self>) {
5453        if epoch == self.blink_epoch {
5454            self.blinking_paused = false;
5455            self.blink_cursors(epoch, cx);
5456        }
5457    }
5458
5459    fn blink_cursors(&mut self, epoch: usize, cx: &mut ViewContext<Self>) {
5460        if epoch == self.blink_epoch && self.focused && !self.blinking_paused {
5461            self.show_local_cursors = !self.show_local_cursors;
5462            cx.notify();
5463
5464            let epoch = self.next_blink_epoch();
5465            cx.spawn(|this, mut cx| {
5466                let this = this.downgrade();
5467                async move {
5468                    Timer::after(CURSOR_BLINK_INTERVAL).await;
5469                    if let Some(this) = this.upgrade(&cx) {
5470                        this.update(&mut cx, |this, cx| this.blink_cursors(epoch, cx));
5471                    }
5472                }
5473            })
5474            .detach();
5475        }
5476    }
5477
5478    pub fn show_local_cursors(&self) -> bool {
5479        self.show_local_cursors
5480    }
5481
5482    fn on_buffer_changed(&mut self, _: ModelHandle<MultiBuffer>, cx: &mut ViewContext<Self>) {
5483        cx.notify();
5484    }
5485
5486    fn on_buffer_event(
5487        &mut self,
5488        _: ModelHandle<MultiBuffer>,
5489        event: &language::Event,
5490        cx: &mut ViewContext<Self>,
5491    ) {
5492        match event {
5493            language::Event::Edited => {
5494                self.refresh_active_diagnostics(cx);
5495                self.refresh_code_actions(cx);
5496                cx.emit(Event::Edited);
5497            }
5498            language::Event::Dirtied => cx.emit(Event::Dirtied),
5499            language::Event::Saved => cx.emit(Event::Saved),
5500            language::Event::FileHandleChanged => cx.emit(Event::TitleChanged),
5501            language::Event::Reloaded => cx.emit(Event::TitleChanged),
5502            language::Event::Closed => cx.emit(Event::Closed),
5503            language::Event::DiagnosticsUpdated => {
5504                self.refresh_active_diagnostics(cx);
5505            }
5506            _ => {}
5507        }
5508    }
5509
5510    fn on_display_map_changed(&mut self, _: ModelHandle<DisplayMap>, cx: &mut ViewContext<Self>) {
5511        cx.notify();
5512    }
5513
5514    pub fn set_searchable(&mut self, searchable: bool) {
5515        self.searchable = searchable;
5516    }
5517
5518    pub fn searchable(&self) -> bool {
5519        self.searchable
5520    }
5521
5522    fn open_excerpts(workspace: &mut Workspace, _: &OpenExcerpts, cx: &mut ViewContext<Workspace>) {
5523        let active_item = workspace.active_item(cx);
5524        let editor_handle = if let Some(editor) = active_item
5525            .as_ref()
5526            .and_then(|item| item.act_as::<Self>(cx))
5527        {
5528            editor
5529        } else {
5530            cx.propagate_action();
5531            return;
5532        };
5533
5534        let editor = editor_handle.read(cx);
5535        let buffer = editor.buffer.read(cx);
5536        if buffer.is_singleton() {
5537            cx.propagate_action();
5538            return;
5539        }
5540
5541        let mut new_selections_by_buffer = HashMap::default();
5542        for selection in editor.local_selections::<usize>(cx) {
5543            for (buffer, mut range) in
5544                buffer.range_to_buffer_ranges(selection.start..selection.end, cx)
5545            {
5546                if selection.reversed {
5547                    mem::swap(&mut range.start, &mut range.end);
5548                }
5549                new_selections_by_buffer
5550                    .entry(buffer)
5551                    .or_insert(Vec::new())
5552                    .push(range)
5553            }
5554        }
5555
5556        editor_handle.update(cx, |editor, cx| {
5557            editor.push_to_nav_history(editor.newest_anchor_selection().head(), None, cx);
5558        });
5559        let nav_history = workspace.active_pane().read(cx).nav_history().clone();
5560        nav_history.borrow_mut().disable();
5561
5562        // We defer the pane interaction because we ourselves are a workspace item
5563        // and activating a new item causes the pane to call a method on us reentrantly,
5564        // which panics if we're on the stack.
5565        cx.defer(move |workspace, cx| {
5566            for (ix, (buffer, ranges)) in new_selections_by_buffer.into_iter().enumerate() {
5567                let buffer = BufferItemHandle(buffer);
5568                if ix == 0 && !workspace.activate_pane_for_item(&buffer, cx) {
5569                    workspace.activate_next_pane(cx);
5570                }
5571
5572                let editor = workspace
5573                    .open_item(buffer, cx)
5574                    .downcast::<Editor>()
5575                    .unwrap();
5576
5577                editor.update(cx, |editor, cx| {
5578                    editor.select_ranges(ranges, Some(Autoscroll::Newest), cx);
5579                });
5580            }
5581
5582            nav_history.borrow_mut().enable();
5583        });
5584    }
5585}
5586
5587impl EditorSnapshot {
5588    pub fn is_focused(&self) -> bool {
5589        self.is_focused
5590    }
5591
5592    pub fn placeholder_text(&self) -> Option<&Arc<str>> {
5593        self.placeholder_text.as_ref()
5594    }
5595
5596    pub fn scroll_position(&self) -> Vector2F {
5597        compute_scroll_position(
5598            &self.display_snapshot,
5599            self.scroll_position,
5600            &self.scroll_top_anchor,
5601        )
5602    }
5603}
5604
5605impl Deref for EditorSnapshot {
5606    type Target = DisplaySnapshot;
5607
5608    fn deref(&self) -> &Self::Target {
5609        &self.display_snapshot
5610    }
5611}
5612
5613fn compute_scroll_position(
5614    snapshot: &DisplaySnapshot,
5615    mut scroll_position: Vector2F,
5616    scroll_top_anchor: &Option<Anchor>,
5617) -> Vector2F {
5618    if let Some(anchor) = scroll_top_anchor {
5619        let scroll_top = anchor.to_display_point(snapshot).row() as f32;
5620        scroll_position.set_y(scroll_top + scroll_position.y());
5621    } else {
5622        scroll_position.set_y(0.);
5623    }
5624    scroll_position
5625}
5626
5627#[derive(Copy, Clone)]
5628pub enum Event {
5629    Activate,
5630    Edited,
5631    Blurred,
5632    Dirtied,
5633    Saved,
5634    TitleChanged,
5635    SelectionsChanged,
5636    Closed,
5637}
5638
5639impl Entity for Editor {
5640    type Event = Event;
5641}
5642
5643impl View for Editor {
5644    fn render(&mut self, cx: &mut RenderContext<Self>) -> ElementBox {
5645        let style = self.style(cx);
5646        self.display_map.update(cx, |map, cx| {
5647            map.set_font(style.text.font_id, style.text.font_size, cx)
5648        });
5649        EditorElement::new(self.handle.clone(), style.clone(), self.cursor_shape).boxed()
5650    }
5651
5652    fn ui_name() -> &'static str {
5653        "Editor"
5654    }
5655
5656    fn on_focus(&mut self, cx: &mut ViewContext<Self>) {
5657        if let Some(rename) = self.pending_rename.as_ref() {
5658            cx.focus(&rename.editor);
5659        } else {
5660            self.focused = true;
5661            self.blink_cursors(self.blink_epoch, cx);
5662            self.buffer.update(cx, |buffer, cx| {
5663                buffer.finalize_last_transaction(cx);
5664                buffer.set_active_selections(&self.selections, cx)
5665            });
5666        }
5667    }
5668
5669    fn on_blur(&mut self, cx: &mut ViewContext<Self>) {
5670        self.focused = false;
5671        self.buffer
5672            .update(cx, |buffer, cx| buffer.remove_active_selections(cx));
5673        self.hide_context_menu(cx);
5674        cx.emit(Event::Blurred);
5675        cx.notify();
5676    }
5677
5678    fn keymap_context(&self, _: &AppContext) -> gpui::keymap::Context {
5679        let mut cx = Self::default_keymap_context();
5680        let mode = match self.mode {
5681            EditorMode::SingleLine => "single_line",
5682            EditorMode::AutoHeight { .. } => "auto_height",
5683            EditorMode::Full => "full",
5684        };
5685        cx.map.insert("mode".into(), mode.into());
5686        if self.pending_rename.is_some() {
5687            cx.set.insert("renaming".into());
5688        }
5689        match self.context_menu.as_ref() {
5690            Some(ContextMenu::Completions(_)) => {
5691                cx.set.insert("showing_completions".into());
5692            }
5693            Some(ContextMenu::CodeActions(_)) => {
5694                cx.set.insert("showing_code_actions".into());
5695            }
5696            None => {}
5697        }
5698        cx
5699    }
5700}
5701
5702fn build_style(
5703    settings: &Settings,
5704    get_field_editor_theme: Option<GetFieldEditorTheme>,
5705    override_text_style: Option<&OverrideTextStyle>,
5706    cx: &AppContext,
5707) -> EditorStyle {
5708    let font_cache = cx.font_cache();
5709
5710    let mut theme = settings.theme.editor.clone();
5711    let mut style = if let Some(get_field_editor_theme) = get_field_editor_theme {
5712        let field_editor_theme = get_field_editor_theme(&settings.theme);
5713        theme.text_color = field_editor_theme.text.color;
5714        theme.selection = field_editor_theme.selection;
5715        EditorStyle {
5716            text: field_editor_theme.text,
5717            placeholder_text: field_editor_theme.placeholder_text,
5718            theme,
5719        }
5720    } else {
5721        let font_family_id = settings.buffer_font_family;
5722        let font_family_name = cx.font_cache().family_name(font_family_id).unwrap();
5723        let font_properties = Default::default();
5724        let font_id = font_cache
5725            .select_font(font_family_id, &font_properties)
5726            .unwrap();
5727        let font_size = settings.buffer_font_size;
5728        EditorStyle {
5729            text: TextStyle {
5730                color: settings.theme.editor.text_color,
5731                font_family_name,
5732                font_family_id,
5733                font_id,
5734                font_size,
5735                font_properties,
5736                underline: None,
5737            },
5738            placeholder_text: None,
5739            theme,
5740        }
5741    };
5742
5743    if let Some(highlight_style) = override_text_style.and_then(|build_style| build_style(&style)) {
5744        if let Some(highlighted) = style
5745            .text
5746            .clone()
5747            .highlight(highlight_style, font_cache)
5748            .log_err()
5749        {
5750            style.text = highlighted;
5751        }
5752    }
5753
5754    style
5755}
5756
5757impl<T: ToPoint + ToOffset> SelectionExt for Selection<T> {
5758    fn point_range(&self, buffer: &MultiBufferSnapshot) -> Range<Point> {
5759        let start = self.start.to_point(buffer);
5760        let end = self.end.to_point(buffer);
5761        if self.reversed {
5762            end..start
5763        } else {
5764            start..end
5765        }
5766    }
5767
5768    fn offset_range(&self, buffer: &MultiBufferSnapshot) -> Range<usize> {
5769        let start = self.start.to_offset(buffer);
5770        let end = self.end.to_offset(buffer);
5771        if self.reversed {
5772            end..start
5773        } else {
5774            start..end
5775        }
5776    }
5777
5778    fn display_range(&self, map: &DisplaySnapshot) -> Range<DisplayPoint> {
5779        let start = self
5780            .start
5781            .to_point(&map.buffer_snapshot)
5782            .to_display_point(map);
5783        let end = self
5784            .end
5785            .to_point(&map.buffer_snapshot)
5786            .to_display_point(map);
5787        if self.reversed {
5788            end..start
5789        } else {
5790            start..end
5791        }
5792    }
5793
5794    fn spanned_rows(
5795        &self,
5796        include_end_if_at_line_start: bool,
5797        map: &DisplaySnapshot,
5798    ) -> Range<u32> {
5799        let start = self.start.to_point(&map.buffer_snapshot);
5800        let mut end = self.end.to_point(&map.buffer_snapshot);
5801        if !include_end_if_at_line_start && start.row != end.row && end.column == 0 {
5802            end.row -= 1;
5803        }
5804
5805        let buffer_start = map.prev_line_boundary(start).0;
5806        let buffer_end = map.next_line_boundary(end).0;
5807        buffer_start.row..buffer_end.row + 1
5808    }
5809}
5810
5811impl<T: InvalidationRegion> InvalidationStack<T> {
5812    fn invalidate<S>(&mut self, selections: &[Selection<S>], buffer: &MultiBufferSnapshot)
5813    where
5814        S: Clone + ToOffset,
5815    {
5816        while let Some(region) = self.last() {
5817            let all_selections_inside_invalidation_ranges =
5818                if selections.len() == region.ranges().len() {
5819                    selections
5820                        .iter()
5821                        .zip(region.ranges().iter().map(|r| r.to_offset(&buffer)))
5822                        .all(|(selection, invalidation_range)| {
5823                            let head = selection.head().to_offset(&buffer);
5824                            invalidation_range.start <= head && invalidation_range.end >= head
5825                        })
5826                } else {
5827                    false
5828                };
5829
5830            if all_selections_inside_invalidation_ranges {
5831                break;
5832            } else {
5833                self.pop();
5834            }
5835        }
5836    }
5837}
5838
5839impl<T> Default for InvalidationStack<T> {
5840    fn default() -> Self {
5841        Self(Default::default())
5842    }
5843}
5844
5845impl<T> Deref for InvalidationStack<T> {
5846    type Target = Vec<T>;
5847
5848    fn deref(&self) -> &Self::Target {
5849        &self.0
5850    }
5851}
5852
5853impl<T> DerefMut for InvalidationStack<T> {
5854    fn deref_mut(&mut self) -> &mut Self::Target {
5855        &mut self.0
5856    }
5857}
5858
5859impl InvalidationRegion for BracketPairState {
5860    fn ranges(&self) -> &[Range<Anchor>] {
5861        &self.ranges
5862    }
5863}
5864
5865impl InvalidationRegion for SnippetState {
5866    fn ranges(&self) -> &[Range<Anchor>] {
5867        &self.ranges[self.active_index]
5868    }
5869}
5870
5871impl Deref for EditorStyle {
5872    type Target = theme::Editor;
5873
5874    fn deref(&self) -> &Self::Target {
5875        &self.theme
5876    }
5877}
5878
5879pub fn diagnostic_block_renderer(
5880    diagnostic: Diagnostic,
5881    is_valid: bool,
5882    settings: watch::Receiver<Settings>,
5883) -> RenderBlock {
5884    let mut highlighted_lines = Vec::new();
5885    for line in diagnostic.message.lines() {
5886        highlighted_lines.push(highlight_diagnostic_message(line));
5887    }
5888
5889    Arc::new(move |cx: &BlockContext| {
5890        let settings = settings.borrow();
5891        let theme = &settings.theme.editor;
5892        let style = diagnostic_style(diagnostic.severity, is_valid, theme);
5893        let font_size = (style.text_scale_factor * settings.buffer_font_size).round();
5894        Flex::column()
5895            .with_children(highlighted_lines.iter().map(|(line, highlights)| {
5896                Label::new(
5897                    line.clone(),
5898                    style.message.clone().with_font_size(font_size),
5899                )
5900                .with_highlights(highlights.clone())
5901                .contained()
5902                .with_margin_left(cx.anchor_x)
5903                .boxed()
5904            }))
5905            .aligned()
5906            .left()
5907            .boxed()
5908    })
5909}
5910
5911pub fn highlight_diagnostic_message(message: &str) -> (String, Vec<usize>) {
5912    let mut message_without_backticks = String::new();
5913    let mut prev_offset = 0;
5914    let mut inside_block = false;
5915    let mut highlights = Vec::new();
5916    for (match_ix, (offset, _)) in message
5917        .match_indices('`')
5918        .chain([(message.len(), "")])
5919        .enumerate()
5920    {
5921        message_without_backticks.push_str(&message[prev_offset..offset]);
5922        if inside_block {
5923            highlights.extend(prev_offset - match_ix..offset - match_ix);
5924        }
5925
5926        inside_block = !inside_block;
5927        prev_offset = offset + 1;
5928    }
5929
5930    (message_without_backticks, highlights)
5931}
5932
5933pub fn diagnostic_style(
5934    severity: DiagnosticSeverity,
5935    valid: bool,
5936    theme: &theme::Editor,
5937) -> DiagnosticStyle {
5938    match (severity, valid) {
5939        (DiagnosticSeverity::ERROR, true) => theme.error_diagnostic.clone(),
5940        (DiagnosticSeverity::ERROR, false) => theme.invalid_error_diagnostic.clone(),
5941        (DiagnosticSeverity::WARNING, true) => theme.warning_diagnostic.clone(),
5942        (DiagnosticSeverity::WARNING, false) => theme.invalid_warning_diagnostic.clone(),
5943        (DiagnosticSeverity::INFORMATION, true) => theme.information_diagnostic.clone(),
5944        (DiagnosticSeverity::INFORMATION, false) => theme.invalid_information_diagnostic.clone(),
5945        (DiagnosticSeverity::HINT, true) => theme.hint_diagnostic.clone(),
5946        (DiagnosticSeverity::HINT, false) => theme.invalid_hint_diagnostic.clone(),
5947        _ => theme.invalid_hint_diagnostic.clone(),
5948    }
5949}
5950
5951pub fn combine_syntax_and_fuzzy_match_highlights(
5952    text: &str,
5953    default_style: HighlightStyle,
5954    syntax_ranges: impl Iterator<Item = (Range<usize>, HighlightStyle)>,
5955    match_indices: &[usize],
5956) -> Vec<(Range<usize>, HighlightStyle)> {
5957    let mut result = Vec::new();
5958    let mut match_indices = match_indices.iter().copied().peekable();
5959
5960    for (range, mut syntax_highlight) in syntax_ranges.chain([(usize::MAX..0, Default::default())])
5961    {
5962        syntax_highlight.font_properties.weight(Default::default());
5963
5964        // Add highlights for any fuzzy match characters before the next
5965        // syntax highlight range.
5966        while let Some(&match_index) = match_indices.peek() {
5967            if match_index >= range.start {
5968                break;
5969            }
5970            match_indices.next();
5971            let end_index = char_ix_after(match_index, text);
5972            let mut match_style = default_style;
5973            match_style.font_properties.weight(fonts::Weight::BOLD);
5974            result.push((match_index..end_index, match_style));
5975        }
5976
5977        if range.start == usize::MAX {
5978            break;
5979        }
5980
5981        // Add highlights for any fuzzy match characters within the
5982        // syntax highlight range.
5983        let mut offset = range.start;
5984        while let Some(&match_index) = match_indices.peek() {
5985            if match_index >= range.end {
5986                break;
5987            }
5988
5989            match_indices.next();
5990            if match_index > offset {
5991                result.push((offset..match_index, syntax_highlight));
5992            }
5993
5994            let mut end_index = char_ix_after(match_index, text);
5995            while let Some(&next_match_index) = match_indices.peek() {
5996                if next_match_index == end_index && next_match_index < range.end {
5997                    end_index = char_ix_after(next_match_index, text);
5998                    match_indices.next();
5999                } else {
6000                    break;
6001                }
6002            }
6003
6004            let mut match_style = syntax_highlight;
6005            match_style.font_properties.weight(fonts::Weight::BOLD);
6006            result.push((match_index..end_index, match_style));
6007            offset = end_index;
6008        }
6009
6010        if offset < range.end {
6011            result.push((offset..range.end, syntax_highlight));
6012        }
6013    }
6014
6015    fn char_ix_after(ix: usize, text: &str) -> usize {
6016        ix + text[ix..].chars().next().unwrap().len_utf8()
6017    }
6018
6019    result
6020}
6021
6022pub fn styled_runs_for_code_label<'a>(
6023    label: &'a CodeLabel,
6024    default_color: Color,
6025    syntax_theme: &'a theme::SyntaxTheme,
6026) -> impl 'a + Iterator<Item = (Range<usize>, HighlightStyle)> {
6027    const MUTED_OPACITY: usize = 165;
6028
6029    let mut muted_default_style = HighlightStyle {
6030        color: default_color,
6031        ..Default::default()
6032    };
6033    muted_default_style.color.a = ((default_color.a as usize * MUTED_OPACITY) / 255) as u8;
6034
6035    let mut prev_end = label.filter_range.end;
6036    label
6037        .runs
6038        .iter()
6039        .enumerate()
6040        .flat_map(move |(ix, (range, highlight_id))| {
6041            let style = if let Some(style) = highlight_id.style(syntax_theme) {
6042                style
6043            } else {
6044                return Default::default();
6045            };
6046            let mut muted_style = style.clone();
6047            muted_style.color.a = ((style.color.a as usize * MUTED_OPACITY) / 255) as u8;
6048
6049            let mut runs = SmallVec::<[(Range<usize>, HighlightStyle); 3]>::new();
6050            if range.start >= label.filter_range.end {
6051                if range.start > prev_end {
6052                    runs.push((prev_end..range.start, muted_default_style));
6053                }
6054                runs.push((range.clone(), muted_style));
6055            } else if range.end <= label.filter_range.end {
6056                runs.push((range.clone(), style));
6057            } else {
6058                runs.push((range.start..label.filter_range.end, style));
6059                runs.push((label.filter_range.end..range.end, muted_style));
6060            }
6061            prev_end = cmp::max(prev_end, range.end);
6062
6063            if ix + 1 == label.runs.len() && label.text.len() > prev_end {
6064                runs.push((prev_end..label.text.len(), muted_default_style));
6065            }
6066
6067            runs
6068        })
6069}
6070
6071#[cfg(test)]
6072mod tests {
6073    use super::*;
6074    use language::{LanguageConfig, LanguageServerConfig};
6075    use lsp::FakeLanguageServer;
6076    use project::FakeFs;
6077    use smol::stream::StreamExt;
6078    use std::{cell::RefCell, rc::Rc, time::Instant};
6079    use text::Point;
6080    use unindent::Unindent;
6081    use util::test::sample_text;
6082
6083    #[gpui::test]
6084    fn test_undo_redo_with_selection_restoration(cx: &mut MutableAppContext) {
6085        let mut now = Instant::now();
6086        let buffer = cx.add_model(|cx| language::Buffer::new(0, "123456", cx));
6087        let group_interval = buffer.read(cx).transaction_group_interval();
6088        let buffer = cx.add_model(|cx| MultiBuffer::singleton(buffer, cx));
6089        let settings = Settings::test(cx);
6090        let (_, editor) = cx.add_window(Default::default(), |cx| {
6091            build_editor(buffer.clone(), settings, cx)
6092        });
6093
6094        editor.update(cx, |editor, cx| {
6095            editor.start_transaction_at(now, cx);
6096            editor.select_ranges([2..4], None, cx);
6097            editor.insert("cd", cx);
6098            editor.end_transaction_at(now, cx);
6099            assert_eq!(editor.text(cx), "12cd56");
6100            assert_eq!(editor.selected_ranges(cx), vec![4..4]);
6101
6102            editor.start_transaction_at(now, cx);
6103            editor.select_ranges([4..5], None, cx);
6104            editor.insert("e", cx);
6105            editor.end_transaction_at(now, cx);
6106            assert_eq!(editor.text(cx), "12cde6");
6107            assert_eq!(editor.selected_ranges(cx), vec![5..5]);
6108
6109            now += group_interval + Duration::from_millis(1);
6110            editor.select_ranges([2..2], None, cx);
6111
6112            // Simulate an edit in another editor
6113            buffer.update(cx, |buffer, cx| {
6114                buffer.start_transaction_at(now, cx);
6115                buffer.edit([0..1], "a", cx);
6116                buffer.edit([1..1], "b", cx);
6117                buffer.end_transaction_at(now, cx);
6118            });
6119
6120            assert_eq!(editor.text(cx), "ab2cde6");
6121            assert_eq!(editor.selected_ranges(cx), vec![3..3]);
6122
6123            // Last transaction happened past the group interval in a different editor.
6124            // Undo it individually and don't restore selections.
6125            editor.undo(&Undo, cx);
6126            assert_eq!(editor.text(cx), "12cde6");
6127            assert_eq!(editor.selected_ranges(cx), vec![2..2]);
6128
6129            // First two transactions happened within the group interval in this editor.
6130            // Undo them together and restore selections.
6131            editor.undo(&Undo, cx);
6132            editor.undo(&Undo, cx); // Undo stack is empty here, so this is a no-op.
6133            assert_eq!(editor.text(cx), "123456");
6134            assert_eq!(editor.selected_ranges(cx), vec![0..0]);
6135
6136            // Redo the first two transactions together.
6137            editor.redo(&Redo, cx);
6138            assert_eq!(editor.text(cx), "12cde6");
6139            assert_eq!(editor.selected_ranges(cx), vec![5..5]);
6140
6141            // Redo the last transaction on its own.
6142            editor.redo(&Redo, cx);
6143            assert_eq!(editor.text(cx), "ab2cde6");
6144            assert_eq!(editor.selected_ranges(cx), vec![6..6]);
6145
6146            // Test empty transactions.
6147            editor.start_transaction_at(now, cx);
6148            editor.end_transaction_at(now, cx);
6149            editor.undo(&Undo, cx);
6150            assert_eq!(editor.text(cx), "12cde6");
6151        });
6152    }
6153
6154    #[gpui::test]
6155    fn test_selection_with_mouse(cx: &mut gpui::MutableAppContext) {
6156        let buffer = MultiBuffer::build_simple("aaaaaa\nbbbbbb\ncccccc\ndddddd\n", cx);
6157        let settings = Settings::test(cx);
6158        let (_, editor) =
6159            cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
6160
6161        editor.update(cx, |view, cx| {
6162            view.begin_selection(DisplayPoint::new(2, 2), false, 1, cx);
6163        });
6164
6165        assert_eq!(
6166            editor.update(cx, |view, cx| view.selected_display_ranges(cx)),
6167            [DisplayPoint::new(2, 2)..DisplayPoint::new(2, 2)]
6168        );
6169
6170        editor.update(cx, |view, cx| {
6171            view.update_selection(DisplayPoint::new(3, 3), 0, Vector2F::zero(), cx);
6172        });
6173
6174        assert_eq!(
6175            editor.update(cx, |view, cx| view.selected_display_ranges(cx)),
6176            [DisplayPoint::new(2, 2)..DisplayPoint::new(3, 3)]
6177        );
6178
6179        editor.update(cx, |view, cx| {
6180            view.update_selection(DisplayPoint::new(1, 1), 0, Vector2F::zero(), cx);
6181        });
6182
6183        assert_eq!(
6184            editor.update(cx, |view, cx| view.selected_display_ranges(cx)),
6185            [DisplayPoint::new(2, 2)..DisplayPoint::new(1, 1)]
6186        );
6187
6188        editor.update(cx, |view, cx| {
6189            view.end_selection(cx);
6190            view.update_selection(DisplayPoint::new(3, 3), 0, Vector2F::zero(), cx);
6191        });
6192
6193        assert_eq!(
6194            editor.update(cx, |view, cx| view.selected_display_ranges(cx)),
6195            [DisplayPoint::new(2, 2)..DisplayPoint::new(1, 1)]
6196        );
6197
6198        editor.update(cx, |view, cx| {
6199            view.begin_selection(DisplayPoint::new(3, 3), true, 1, cx);
6200            view.update_selection(DisplayPoint::new(0, 0), 0, Vector2F::zero(), cx);
6201        });
6202
6203        assert_eq!(
6204            editor.update(cx, |view, cx| view.selected_display_ranges(cx)),
6205            [
6206                DisplayPoint::new(2, 2)..DisplayPoint::new(1, 1),
6207                DisplayPoint::new(3, 3)..DisplayPoint::new(0, 0)
6208            ]
6209        );
6210
6211        editor.update(cx, |view, cx| {
6212            view.end_selection(cx);
6213        });
6214
6215        assert_eq!(
6216            editor.update(cx, |view, cx| view.selected_display_ranges(cx)),
6217            [DisplayPoint::new(3, 3)..DisplayPoint::new(0, 0)]
6218        );
6219    }
6220
6221    #[gpui::test]
6222    fn test_canceling_pending_selection(cx: &mut gpui::MutableAppContext) {
6223        let buffer = MultiBuffer::build_simple("aaaaaa\nbbbbbb\ncccccc\ndddddd\n", cx);
6224        let settings = Settings::test(cx);
6225        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
6226
6227        view.update(cx, |view, cx| {
6228            view.begin_selection(DisplayPoint::new(2, 2), false, 1, cx);
6229            assert_eq!(
6230                view.selected_display_ranges(cx),
6231                [DisplayPoint::new(2, 2)..DisplayPoint::new(2, 2)]
6232            );
6233        });
6234
6235        view.update(cx, |view, cx| {
6236            view.update_selection(DisplayPoint::new(3, 3), 0, Vector2F::zero(), cx);
6237            assert_eq!(
6238                view.selected_display_ranges(cx),
6239                [DisplayPoint::new(2, 2)..DisplayPoint::new(3, 3)]
6240            );
6241        });
6242
6243        view.update(cx, |view, cx| {
6244            view.cancel(&Cancel, cx);
6245            view.update_selection(DisplayPoint::new(1, 1), 0, Vector2F::zero(), cx);
6246            assert_eq!(
6247                view.selected_display_ranges(cx),
6248                [DisplayPoint::new(2, 2)..DisplayPoint::new(3, 3)]
6249            );
6250        });
6251    }
6252
6253    #[gpui::test]
6254    fn test_navigation_history(cx: &mut gpui::MutableAppContext) {
6255        cx.add_window(Default::default(), |cx| {
6256            use workspace::ItemView;
6257            let nav_history = Rc::new(RefCell::new(workspace::NavHistory::default()));
6258            let settings = Settings::test(&cx);
6259            let buffer = MultiBuffer::build_simple(&sample_text(30, 5, 'a'), cx);
6260            let mut editor = build_editor(buffer.clone(), settings, cx);
6261            editor.nav_history = Some(ItemNavHistory::new(nav_history.clone(), &cx.handle()));
6262
6263            // Move the cursor a small distance.
6264            // Nothing is added to the navigation history.
6265            editor.select_display_ranges(&[DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0)], cx);
6266            editor.select_display_ranges(&[DisplayPoint::new(3, 0)..DisplayPoint::new(3, 0)], cx);
6267            assert!(nav_history.borrow_mut().pop_backward().is_none());
6268
6269            // Move the cursor a large distance.
6270            // The history can jump back to the previous position.
6271            editor.select_display_ranges(&[DisplayPoint::new(13, 0)..DisplayPoint::new(13, 3)], cx);
6272            let nav_entry = nav_history.borrow_mut().pop_backward().unwrap();
6273            editor.navigate(nav_entry.data.unwrap(), cx);
6274            assert_eq!(nav_entry.item_view.id(), cx.view_id());
6275            assert_eq!(
6276                editor.selected_display_ranges(cx),
6277                &[DisplayPoint::new(3, 0)..DisplayPoint::new(3, 0)]
6278            );
6279
6280            // Move the cursor a small distance via the mouse.
6281            // Nothing is added to the navigation history.
6282            editor.begin_selection(DisplayPoint::new(5, 0), false, 1, cx);
6283            editor.end_selection(cx);
6284            assert_eq!(
6285                editor.selected_display_ranges(cx),
6286                &[DisplayPoint::new(5, 0)..DisplayPoint::new(5, 0)]
6287            );
6288            assert!(nav_history.borrow_mut().pop_backward().is_none());
6289
6290            // Move the cursor a large distance via the mouse.
6291            // The history can jump back to the previous position.
6292            editor.begin_selection(DisplayPoint::new(15, 0), false, 1, cx);
6293            editor.end_selection(cx);
6294            assert_eq!(
6295                editor.selected_display_ranges(cx),
6296                &[DisplayPoint::new(15, 0)..DisplayPoint::new(15, 0)]
6297            );
6298            let nav_entry = nav_history.borrow_mut().pop_backward().unwrap();
6299            editor.navigate(nav_entry.data.unwrap(), cx);
6300            assert_eq!(nav_entry.item_view.id(), cx.view_id());
6301            assert_eq!(
6302                editor.selected_display_ranges(cx),
6303                &[DisplayPoint::new(5, 0)..DisplayPoint::new(5, 0)]
6304            );
6305
6306            editor
6307        });
6308    }
6309
6310    #[gpui::test]
6311    fn test_cancel(cx: &mut gpui::MutableAppContext) {
6312        let buffer = MultiBuffer::build_simple("aaaaaa\nbbbbbb\ncccccc\ndddddd\n", cx);
6313        let settings = Settings::test(cx);
6314        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
6315
6316        view.update(cx, |view, cx| {
6317            view.begin_selection(DisplayPoint::new(3, 4), false, 1, cx);
6318            view.update_selection(DisplayPoint::new(1, 1), 0, Vector2F::zero(), cx);
6319            view.end_selection(cx);
6320
6321            view.begin_selection(DisplayPoint::new(0, 1), true, 1, cx);
6322            view.update_selection(DisplayPoint::new(0, 3), 0, Vector2F::zero(), cx);
6323            view.end_selection(cx);
6324            assert_eq!(
6325                view.selected_display_ranges(cx),
6326                [
6327                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 3),
6328                    DisplayPoint::new(3, 4)..DisplayPoint::new(1, 1),
6329                ]
6330            );
6331        });
6332
6333        view.update(cx, |view, cx| {
6334            view.cancel(&Cancel, cx);
6335            assert_eq!(
6336                view.selected_display_ranges(cx),
6337                [DisplayPoint::new(3, 4)..DisplayPoint::new(1, 1)]
6338            );
6339        });
6340
6341        view.update(cx, |view, cx| {
6342            view.cancel(&Cancel, cx);
6343            assert_eq!(
6344                view.selected_display_ranges(cx),
6345                [DisplayPoint::new(1, 1)..DisplayPoint::new(1, 1)]
6346            );
6347        });
6348    }
6349
6350    #[gpui::test]
6351    fn test_fold(cx: &mut gpui::MutableAppContext) {
6352        let buffer = MultiBuffer::build_simple(
6353            &"
6354                impl Foo {
6355                    // Hello!
6356
6357                    fn a() {
6358                        1
6359                    }
6360
6361                    fn b() {
6362                        2
6363                    }
6364
6365                    fn c() {
6366                        3
6367                    }
6368                }
6369            "
6370            .unindent(),
6371            cx,
6372        );
6373        let settings = Settings::test(&cx);
6374        let (_, view) = cx.add_window(Default::default(), |cx| {
6375            build_editor(buffer.clone(), settings, cx)
6376        });
6377
6378        view.update(cx, |view, cx| {
6379            view.select_display_ranges(&[DisplayPoint::new(8, 0)..DisplayPoint::new(12, 0)], cx);
6380            view.fold(&Fold, cx);
6381            assert_eq!(
6382                view.display_text(cx),
6383                "
6384                    impl Foo {
6385                        // Hello!
6386
6387                        fn a() {
6388                            1
6389                        }
6390
6391                        fn b() {…
6392                        }
6393
6394                        fn c() {…
6395                        }
6396                    }
6397                "
6398                .unindent(),
6399            );
6400
6401            view.fold(&Fold, cx);
6402            assert_eq!(
6403                view.display_text(cx),
6404                "
6405                    impl Foo {…
6406                    }
6407                "
6408                .unindent(),
6409            );
6410
6411            view.unfold(&Unfold, cx);
6412            assert_eq!(
6413                view.display_text(cx),
6414                "
6415                    impl Foo {
6416                        // Hello!
6417
6418                        fn a() {
6419                            1
6420                        }
6421
6422                        fn b() {…
6423                        }
6424
6425                        fn c() {…
6426                        }
6427                    }
6428                "
6429                .unindent(),
6430            );
6431
6432            view.unfold(&Unfold, cx);
6433            assert_eq!(view.display_text(cx), buffer.read(cx).read(cx).text());
6434        });
6435    }
6436
6437    #[gpui::test]
6438    fn test_move_cursor(cx: &mut gpui::MutableAppContext) {
6439        let buffer = MultiBuffer::build_simple(&sample_text(6, 6, 'a'), cx);
6440        let settings = Settings::test(&cx);
6441        let (_, view) = cx.add_window(Default::default(), |cx| {
6442            build_editor(buffer.clone(), settings, cx)
6443        });
6444
6445        buffer.update(cx, |buffer, cx| {
6446            buffer.edit(
6447                vec![
6448                    Point::new(1, 0)..Point::new(1, 0),
6449                    Point::new(1, 1)..Point::new(1, 1),
6450                ],
6451                "\t",
6452                cx,
6453            );
6454        });
6455
6456        view.update(cx, |view, cx| {
6457            assert_eq!(
6458                view.selected_display_ranges(cx),
6459                &[DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0)]
6460            );
6461
6462            view.move_down(&MoveDown, cx);
6463            assert_eq!(
6464                view.selected_display_ranges(cx),
6465                &[DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0)]
6466            );
6467
6468            view.move_right(&MoveRight, cx);
6469            assert_eq!(
6470                view.selected_display_ranges(cx),
6471                &[DisplayPoint::new(1, 4)..DisplayPoint::new(1, 4)]
6472            );
6473
6474            view.move_left(&MoveLeft, cx);
6475            assert_eq!(
6476                view.selected_display_ranges(cx),
6477                &[DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0)]
6478            );
6479
6480            view.move_up(&MoveUp, cx);
6481            assert_eq!(
6482                view.selected_display_ranges(cx),
6483                &[DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0)]
6484            );
6485
6486            view.move_to_end(&MoveToEnd, cx);
6487            assert_eq!(
6488                view.selected_display_ranges(cx),
6489                &[DisplayPoint::new(5, 6)..DisplayPoint::new(5, 6)]
6490            );
6491
6492            view.move_to_beginning(&MoveToBeginning, cx);
6493            assert_eq!(
6494                view.selected_display_ranges(cx),
6495                &[DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0)]
6496            );
6497
6498            view.select_display_ranges(&[DisplayPoint::new(0, 1)..DisplayPoint::new(0, 2)], cx);
6499            view.select_to_beginning(&SelectToBeginning, cx);
6500            assert_eq!(
6501                view.selected_display_ranges(cx),
6502                &[DisplayPoint::new(0, 1)..DisplayPoint::new(0, 0)]
6503            );
6504
6505            view.select_to_end(&SelectToEnd, cx);
6506            assert_eq!(
6507                view.selected_display_ranges(cx),
6508                &[DisplayPoint::new(0, 1)..DisplayPoint::new(5, 6)]
6509            );
6510        });
6511    }
6512
6513    #[gpui::test]
6514    fn test_move_cursor_multibyte(cx: &mut gpui::MutableAppContext) {
6515        let buffer = MultiBuffer::build_simple("ⓐⓑⓒⓓⓔ\nabcde\nαβγδε\n", cx);
6516        let settings = Settings::test(&cx);
6517        let (_, view) = cx.add_window(Default::default(), |cx| {
6518            build_editor(buffer.clone(), settings, cx)
6519        });
6520
6521        assert_eq!('ⓐ'.len_utf8(), 3);
6522        assert_eq!('α'.len_utf8(), 2);
6523
6524        view.update(cx, |view, cx| {
6525            view.fold_ranges(
6526                vec![
6527                    Point::new(0, 6)..Point::new(0, 12),
6528                    Point::new(1, 2)..Point::new(1, 4),
6529                    Point::new(2, 4)..Point::new(2, 8),
6530                ],
6531                cx,
6532            );
6533            assert_eq!(view.display_text(cx), "ⓐⓑ…ⓔ\nab…e\nαβ…ε\n");
6534
6535            view.move_right(&MoveRight, cx);
6536            assert_eq!(
6537                view.selected_display_ranges(cx),
6538                &[empty_range(0, "ⓐ".len())]
6539            );
6540            view.move_right(&MoveRight, cx);
6541            assert_eq!(
6542                view.selected_display_ranges(cx),
6543                &[empty_range(0, "ⓐⓑ".len())]
6544            );
6545            view.move_right(&MoveRight, cx);
6546            assert_eq!(
6547                view.selected_display_ranges(cx),
6548                &[empty_range(0, "ⓐⓑ…".len())]
6549            );
6550
6551            view.move_down(&MoveDown, cx);
6552            assert_eq!(
6553                view.selected_display_ranges(cx),
6554                &[empty_range(1, "ab…".len())]
6555            );
6556            view.move_left(&MoveLeft, cx);
6557            assert_eq!(
6558                view.selected_display_ranges(cx),
6559                &[empty_range(1, "ab".len())]
6560            );
6561            view.move_left(&MoveLeft, cx);
6562            assert_eq!(
6563                view.selected_display_ranges(cx),
6564                &[empty_range(1, "a".len())]
6565            );
6566
6567            view.move_down(&MoveDown, cx);
6568            assert_eq!(
6569                view.selected_display_ranges(cx),
6570                &[empty_range(2, "α".len())]
6571            );
6572            view.move_right(&MoveRight, cx);
6573            assert_eq!(
6574                view.selected_display_ranges(cx),
6575                &[empty_range(2, "αβ".len())]
6576            );
6577            view.move_right(&MoveRight, cx);
6578            assert_eq!(
6579                view.selected_display_ranges(cx),
6580                &[empty_range(2, "αβ…".len())]
6581            );
6582            view.move_right(&MoveRight, cx);
6583            assert_eq!(
6584                view.selected_display_ranges(cx),
6585                &[empty_range(2, "αβ…ε".len())]
6586            );
6587
6588            view.move_up(&MoveUp, cx);
6589            assert_eq!(
6590                view.selected_display_ranges(cx),
6591                &[empty_range(1, "ab…e".len())]
6592            );
6593            view.move_up(&MoveUp, cx);
6594            assert_eq!(
6595                view.selected_display_ranges(cx),
6596                &[empty_range(0, "ⓐⓑ…ⓔ".len())]
6597            );
6598            view.move_left(&MoveLeft, cx);
6599            assert_eq!(
6600                view.selected_display_ranges(cx),
6601                &[empty_range(0, "ⓐⓑ…".len())]
6602            );
6603            view.move_left(&MoveLeft, cx);
6604            assert_eq!(
6605                view.selected_display_ranges(cx),
6606                &[empty_range(0, "ⓐⓑ".len())]
6607            );
6608            view.move_left(&MoveLeft, cx);
6609            assert_eq!(
6610                view.selected_display_ranges(cx),
6611                &[empty_range(0, "ⓐ".len())]
6612            );
6613        });
6614    }
6615
6616    #[gpui::test]
6617    fn test_move_cursor_different_line_lengths(cx: &mut gpui::MutableAppContext) {
6618        let buffer = MultiBuffer::build_simple("ⓐⓑⓒⓓⓔ\nabcd\nαβγ\nabcd\nⓐⓑⓒⓓⓔ\n", cx);
6619        let settings = Settings::test(&cx);
6620        let (_, view) = cx.add_window(Default::default(), |cx| {
6621            build_editor(buffer.clone(), settings, cx)
6622        });
6623        view.update(cx, |view, cx| {
6624            view.select_display_ranges(&[empty_range(0, "ⓐⓑⓒⓓⓔ".len())], cx);
6625            view.move_down(&MoveDown, cx);
6626            assert_eq!(
6627                view.selected_display_ranges(cx),
6628                &[empty_range(1, "abcd".len())]
6629            );
6630
6631            view.move_down(&MoveDown, cx);
6632            assert_eq!(
6633                view.selected_display_ranges(cx),
6634                &[empty_range(2, "αβγ".len())]
6635            );
6636
6637            view.move_down(&MoveDown, cx);
6638            assert_eq!(
6639                view.selected_display_ranges(cx),
6640                &[empty_range(3, "abcd".len())]
6641            );
6642
6643            view.move_down(&MoveDown, cx);
6644            assert_eq!(
6645                view.selected_display_ranges(cx),
6646                &[empty_range(4, "ⓐⓑⓒⓓⓔ".len())]
6647            );
6648
6649            view.move_up(&MoveUp, cx);
6650            assert_eq!(
6651                view.selected_display_ranges(cx),
6652                &[empty_range(3, "abcd".len())]
6653            );
6654
6655            view.move_up(&MoveUp, cx);
6656            assert_eq!(
6657                view.selected_display_ranges(cx),
6658                &[empty_range(2, "αβγ".len())]
6659            );
6660        });
6661    }
6662
6663    #[gpui::test]
6664    fn test_beginning_end_of_line(cx: &mut gpui::MutableAppContext) {
6665        let buffer = MultiBuffer::build_simple("abc\n  def", cx);
6666        let settings = Settings::test(&cx);
6667        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
6668        view.update(cx, |view, cx| {
6669            view.select_display_ranges(
6670                &[
6671                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1),
6672                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 4),
6673                ],
6674                cx,
6675            );
6676        });
6677
6678        view.update(cx, |view, cx| {
6679            view.move_to_beginning_of_line(&MoveToBeginningOfLine, cx);
6680            assert_eq!(
6681                view.selected_display_ranges(cx),
6682                &[
6683                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
6684                    DisplayPoint::new(1, 2)..DisplayPoint::new(1, 2),
6685                ]
6686            );
6687        });
6688
6689        view.update(cx, |view, cx| {
6690            view.move_to_beginning_of_line(&MoveToBeginningOfLine, cx);
6691            assert_eq!(
6692                view.selected_display_ranges(cx),
6693                &[
6694                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
6695                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
6696                ]
6697            );
6698        });
6699
6700        view.update(cx, |view, cx| {
6701            view.move_to_beginning_of_line(&MoveToBeginningOfLine, cx);
6702            assert_eq!(
6703                view.selected_display_ranges(cx),
6704                &[
6705                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
6706                    DisplayPoint::new(1, 2)..DisplayPoint::new(1, 2),
6707                ]
6708            );
6709        });
6710
6711        view.update(cx, |view, cx| {
6712            view.move_to_end_of_line(&MoveToEndOfLine, cx);
6713            assert_eq!(
6714                view.selected_display_ranges(cx),
6715                &[
6716                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 3),
6717                    DisplayPoint::new(1, 5)..DisplayPoint::new(1, 5),
6718                ]
6719            );
6720        });
6721
6722        // Moving to the end of line again is a no-op.
6723        view.update(cx, |view, cx| {
6724            view.move_to_end_of_line(&MoveToEndOfLine, cx);
6725            assert_eq!(
6726                view.selected_display_ranges(cx),
6727                &[
6728                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 3),
6729                    DisplayPoint::new(1, 5)..DisplayPoint::new(1, 5),
6730                ]
6731            );
6732        });
6733
6734        view.update(cx, |view, cx| {
6735            view.move_left(&MoveLeft, cx);
6736            view.select_to_beginning_of_line(&SelectToBeginningOfLine(true), cx);
6737            assert_eq!(
6738                view.selected_display_ranges(cx),
6739                &[
6740                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 0),
6741                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 2),
6742                ]
6743            );
6744        });
6745
6746        view.update(cx, |view, cx| {
6747            view.select_to_beginning_of_line(&SelectToBeginningOfLine(true), cx);
6748            assert_eq!(
6749                view.selected_display_ranges(cx),
6750                &[
6751                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 0),
6752                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 0),
6753                ]
6754            );
6755        });
6756
6757        view.update(cx, |view, cx| {
6758            view.select_to_beginning_of_line(&SelectToBeginningOfLine(true), cx);
6759            assert_eq!(
6760                view.selected_display_ranges(cx),
6761                &[
6762                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 0),
6763                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 2),
6764                ]
6765            );
6766        });
6767
6768        view.update(cx, |view, cx| {
6769            view.select_to_end_of_line(&SelectToEndOfLine(true), cx);
6770            assert_eq!(
6771                view.selected_display_ranges(cx),
6772                &[
6773                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 3),
6774                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 5),
6775                ]
6776            );
6777        });
6778
6779        view.update(cx, |view, cx| {
6780            view.delete_to_end_of_line(&DeleteToEndOfLine, cx);
6781            assert_eq!(view.display_text(cx), "ab\n  de");
6782            assert_eq!(
6783                view.selected_display_ranges(cx),
6784                &[
6785                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
6786                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 4),
6787                ]
6788            );
6789        });
6790
6791        view.update(cx, |view, cx| {
6792            view.delete_to_beginning_of_line(&DeleteToBeginningOfLine, cx);
6793            assert_eq!(view.display_text(cx), "\n");
6794            assert_eq!(
6795                view.selected_display_ranges(cx),
6796                &[
6797                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
6798                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
6799                ]
6800            );
6801        });
6802    }
6803
6804    #[gpui::test]
6805    fn test_prev_next_word_boundary(cx: &mut gpui::MutableAppContext) {
6806        let buffer = MultiBuffer::build_simple("use std::str::{foo, bar}\n\n  {baz.qux()}", cx);
6807        let settings = Settings::test(&cx);
6808        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
6809        view.update(cx, |view, cx| {
6810            view.select_display_ranges(
6811                &[
6812                    DisplayPoint::new(0, 11)..DisplayPoint::new(0, 11),
6813                    DisplayPoint::new(2, 4)..DisplayPoint::new(2, 4),
6814                ],
6815                cx,
6816            );
6817        });
6818
6819        view.update(cx, |view, cx| {
6820            view.move_to_previous_word_boundary(&MoveToPreviousWordBoundary, cx);
6821            assert_eq!(
6822                view.selected_display_ranges(cx),
6823                &[
6824                    DisplayPoint::new(0, 9)..DisplayPoint::new(0, 9),
6825                    DisplayPoint::new(2, 3)..DisplayPoint::new(2, 3),
6826                ]
6827            );
6828        });
6829
6830        view.update(cx, |view, cx| {
6831            view.move_to_previous_word_boundary(&MoveToPreviousWordBoundary, cx);
6832            assert_eq!(
6833                view.selected_display_ranges(cx),
6834                &[
6835                    DisplayPoint::new(0, 7)..DisplayPoint::new(0, 7),
6836                    DisplayPoint::new(2, 2)..DisplayPoint::new(2, 2),
6837                ]
6838            );
6839        });
6840
6841        view.update(cx, |view, cx| {
6842            view.move_to_previous_word_boundary(&MoveToPreviousWordBoundary, cx);
6843            assert_eq!(
6844                view.selected_display_ranges(cx),
6845                &[
6846                    DisplayPoint::new(0, 4)..DisplayPoint::new(0, 4),
6847                    DisplayPoint::new(2, 0)..DisplayPoint::new(2, 0),
6848                ]
6849            );
6850        });
6851
6852        view.update(cx, |view, cx| {
6853            view.move_to_previous_word_boundary(&MoveToPreviousWordBoundary, cx);
6854            assert_eq!(
6855                view.selected_display_ranges(cx),
6856                &[
6857                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
6858                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
6859                ]
6860            );
6861        });
6862
6863        view.update(cx, |view, cx| {
6864            view.move_to_previous_word_boundary(&MoveToPreviousWordBoundary, cx);
6865            assert_eq!(
6866                view.selected_display_ranges(cx),
6867                &[
6868                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
6869                    DisplayPoint::new(0, 23)..DisplayPoint::new(0, 23),
6870                ]
6871            );
6872        });
6873
6874        view.update(cx, |view, cx| {
6875            view.move_to_next_word_boundary(&MoveToNextWordBoundary, cx);
6876            assert_eq!(
6877                view.selected_display_ranges(cx),
6878                &[
6879                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 3),
6880                    DisplayPoint::new(0, 24)..DisplayPoint::new(0, 24),
6881                ]
6882            );
6883        });
6884
6885        view.update(cx, |view, cx| {
6886            view.move_to_next_word_boundary(&MoveToNextWordBoundary, cx);
6887            assert_eq!(
6888                view.selected_display_ranges(cx),
6889                &[
6890                    DisplayPoint::new(0, 7)..DisplayPoint::new(0, 7),
6891                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
6892                ]
6893            );
6894        });
6895
6896        view.update(cx, |view, cx| {
6897            view.move_to_next_word_boundary(&MoveToNextWordBoundary, cx);
6898            assert_eq!(
6899                view.selected_display_ranges(cx),
6900                &[
6901                    DisplayPoint::new(0, 9)..DisplayPoint::new(0, 9),
6902                    DisplayPoint::new(2, 3)..DisplayPoint::new(2, 3),
6903                ]
6904            );
6905        });
6906
6907        view.update(cx, |view, cx| {
6908            view.move_right(&MoveRight, cx);
6909            view.select_to_previous_word_boundary(&SelectToPreviousWordBoundary, cx);
6910            assert_eq!(
6911                view.selected_display_ranges(cx),
6912                &[
6913                    DisplayPoint::new(0, 10)..DisplayPoint::new(0, 9),
6914                    DisplayPoint::new(2, 4)..DisplayPoint::new(2, 3),
6915                ]
6916            );
6917        });
6918
6919        view.update(cx, |view, cx| {
6920            view.select_to_previous_word_boundary(&SelectToPreviousWordBoundary, cx);
6921            assert_eq!(
6922                view.selected_display_ranges(cx),
6923                &[
6924                    DisplayPoint::new(0, 10)..DisplayPoint::new(0, 7),
6925                    DisplayPoint::new(2, 4)..DisplayPoint::new(2, 2),
6926                ]
6927            );
6928        });
6929
6930        view.update(cx, |view, cx| {
6931            view.select_to_next_word_boundary(&SelectToNextWordBoundary, cx);
6932            assert_eq!(
6933                view.selected_display_ranges(cx),
6934                &[
6935                    DisplayPoint::new(0, 10)..DisplayPoint::new(0, 9),
6936                    DisplayPoint::new(2, 4)..DisplayPoint::new(2, 3),
6937                ]
6938            );
6939        });
6940    }
6941
6942    #[gpui::test]
6943    fn test_prev_next_word_bounds_with_soft_wrap(cx: &mut gpui::MutableAppContext) {
6944        let buffer = MultiBuffer::build_simple("use one::{\n    two::three::four::five\n};", cx);
6945        let settings = Settings::test(&cx);
6946        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
6947
6948        view.update(cx, |view, cx| {
6949            view.set_wrap_width(Some(140.), cx);
6950            assert_eq!(
6951                view.display_text(cx),
6952                "use one::{\n    two::three::\n    four::five\n};"
6953            );
6954
6955            view.select_display_ranges(&[DisplayPoint::new(1, 7)..DisplayPoint::new(1, 7)], cx);
6956
6957            view.move_to_next_word_boundary(&MoveToNextWordBoundary, cx);
6958            assert_eq!(
6959                view.selected_display_ranges(cx),
6960                &[DisplayPoint::new(1, 9)..DisplayPoint::new(1, 9)]
6961            );
6962
6963            view.move_to_next_word_boundary(&MoveToNextWordBoundary, cx);
6964            assert_eq!(
6965                view.selected_display_ranges(cx),
6966                &[DisplayPoint::new(1, 14)..DisplayPoint::new(1, 14)]
6967            );
6968
6969            view.move_to_next_word_boundary(&MoveToNextWordBoundary, cx);
6970            assert_eq!(
6971                view.selected_display_ranges(cx),
6972                &[DisplayPoint::new(2, 4)..DisplayPoint::new(2, 4)]
6973            );
6974
6975            view.move_to_next_word_boundary(&MoveToNextWordBoundary, cx);
6976            assert_eq!(
6977                view.selected_display_ranges(cx),
6978                &[DisplayPoint::new(2, 8)..DisplayPoint::new(2, 8)]
6979            );
6980
6981            view.move_to_previous_word_boundary(&MoveToPreviousWordBoundary, cx);
6982            assert_eq!(
6983                view.selected_display_ranges(cx),
6984                &[DisplayPoint::new(2, 4)..DisplayPoint::new(2, 4)]
6985            );
6986
6987            view.move_to_previous_word_boundary(&MoveToPreviousWordBoundary, cx);
6988            assert_eq!(
6989                view.selected_display_ranges(cx),
6990                &[DisplayPoint::new(1, 14)..DisplayPoint::new(1, 14)]
6991            );
6992        });
6993    }
6994
6995    #[gpui::test]
6996    fn test_delete_to_word_boundary(cx: &mut gpui::MutableAppContext) {
6997        let buffer = MultiBuffer::build_simple("one two three four", cx);
6998        let settings = Settings::test(&cx);
6999        let (_, view) = cx.add_window(Default::default(), |cx| {
7000            build_editor(buffer.clone(), settings, cx)
7001        });
7002
7003        view.update(cx, |view, cx| {
7004            view.select_display_ranges(
7005                &[
7006                    // an empty selection - the preceding word fragment is deleted
7007                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
7008                    // characters selected - they are deleted
7009                    DisplayPoint::new(0, 9)..DisplayPoint::new(0, 12),
7010                ],
7011                cx,
7012            );
7013            view.delete_to_previous_word_boundary(&DeleteToPreviousWordBoundary, cx);
7014        });
7015
7016        assert_eq!(buffer.read(cx).read(cx).text(), "e two te four");
7017
7018        view.update(cx, |view, cx| {
7019            view.select_display_ranges(
7020                &[
7021                    // an empty selection - the following word fragment is deleted
7022                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 3),
7023                    // characters selected - they are deleted
7024                    DisplayPoint::new(0, 9)..DisplayPoint::new(0, 10),
7025                ],
7026                cx,
7027            );
7028            view.delete_to_next_word_boundary(&DeleteToNextWordBoundary, cx);
7029        });
7030
7031        assert_eq!(buffer.read(cx).read(cx).text(), "e t te our");
7032    }
7033
7034    #[gpui::test]
7035    fn test_newline(cx: &mut gpui::MutableAppContext) {
7036        let buffer = MultiBuffer::build_simple("aaaa\n    bbbb\n", cx);
7037        let settings = Settings::test(&cx);
7038        let (_, view) = cx.add_window(Default::default(), |cx| {
7039            build_editor(buffer.clone(), settings, cx)
7040        });
7041
7042        view.update(cx, |view, cx| {
7043            view.select_display_ranges(
7044                &[
7045                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
7046                    DisplayPoint::new(1, 2)..DisplayPoint::new(1, 2),
7047                    DisplayPoint::new(1, 6)..DisplayPoint::new(1, 6),
7048                ],
7049                cx,
7050            );
7051
7052            view.newline(&Newline, cx);
7053            assert_eq!(view.text(cx), "aa\naa\n  \n    bb\n    bb\n");
7054        });
7055    }
7056
7057    #[gpui::test]
7058    fn test_newline_with_old_selections(cx: &mut gpui::MutableAppContext) {
7059        let buffer = MultiBuffer::build_simple(
7060            "
7061                a
7062                b(
7063                    X
7064                )
7065                c(
7066                    X
7067                )
7068            "
7069            .unindent()
7070            .as_str(),
7071            cx,
7072        );
7073
7074        let settings = Settings::test(&cx);
7075        let (_, editor) = cx.add_window(Default::default(), |cx| {
7076            let mut editor = build_editor(buffer.clone(), settings, cx);
7077            editor.select_ranges(
7078                [
7079                    Point::new(2, 4)..Point::new(2, 5),
7080                    Point::new(5, 4)..Point::new(5, 5),
7081                ],
7082                None,
7083                cx,
7084            );
7085            editor
7086        });
7087
7088        // Edit the buffer directly, deleting ranges surrounding the editor's selections
7089        buffer.update(cx, |buffer, cx| {
7090            buffer.edit(
7091                [
7092                    Point::new(1, 2)..Point::new(3, 0),
7093                    Point::new(4, 2)..Point::new(6, 0),
7094                ],
7095                "",
7096                cx,
7097            );
7098            assert_eq!(
7099                buffer.read(cx).text(),
7100                "
7101                    a
7102                    b()
7103                    c()
7104                "
7105                .unindent()
7106            );
7107        });
7108
7109        editor.update(cx, |editor, cx| {
7110            assert_eq!(
7111                editor.selected_ranges(cx),
7112                &[
7113                    Point::new(1, 2)..Point::new(1, 2),
7114                    Point::new(2, 2)..Point::new(2, 2),
7115                ],
7116            );
7117
7118            editor.newline(&Newline, cx);
7119            assert_eq!(
7120                editor.text(cx),
7121                "
7122                    a
7123                    b(
7124                    )
7125                    c(
7126                    )
7127                "
7128                .unindent()
7129            );
7130
7131            // The selections are moved after the inserted newlines
7132            assert_eq!(
7133                editor.selected_ranges(cx),
7134                &[
7135                    Point::new(2, 0)..Point::new(2, 0),
7136                    Point::new(4, 0)..Point::new(4, 0),
7137                ],
7138            );
7139        });
7140    }
7141
7142    #[gpui::test]
7143    fn test_insert_with_old_selections(cx: &mut gpui::MutableAppContext) {
7144        let buffer = MultiBuffer::build_simple("a( X ), b( Y ), c( Z )", cx);
7145
7146        let settings = Settings::test(&cx);
7147        let (_, editor) = cx.add_window(Default::default(), |cx| {
7148            let mut editor = build_editor(buffer.clone(), settings, cx);
7149            editor.select_ranges([3..4, 11..12, 19..20], None, cx);
7150            editor
7151        });
7152
7153        // Edit the buffer directly, deleting ranges surrounding the editor's selections
7154        buffer.update(cx, |buffer, cx| {
7155            buffer.edit([2..5, 10..13, 18..21], "", cx);
7156            assert_eq!(buffer.read(cx).text(), "a(), b(), c()".unindent());
7157        });
7158
7159        editor.update(cx, |editor, cx| {
7160            assert_eq!(editor.selected_ranges(cx), &[2..2, 7..7, 12..12],);
7161
7162            editor.insert("Z", cx);
7163            assert_eq!(editor.text(cx), "a(Z), b(Z), c(Z)");
7164
7165            // The selections are moved after the inserted characters
7166            assert_eq!(editor.selected_ranges(cx), &[3..3, 9..9, 15..15],);
7167        });
7168    }
7169
7170    #[gpui::test]
7171    fn test_indent_outdent(cx: &mut gpui::MutableAppContext) {
7172        let buffer = MultiBuffer::build_simple("  one two\nthree\n four", cx);
7173        let settings = Settings::test(&cx);
7174        let (_, view) = cx.add_window(Default::default(), |cx| {
7175            build_editor(buffer.clone(), settings, cx)
7176        });
7177
7178        view.update(cx, |view, cx| {
7179            // two selections on the same line
7180            view.select_display_ranges(
7181                &[
7182                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 5),
7183                    DisplayPoint::new(0, 6)..DisplayPoint::new(0, 9),
7184                ],
7185                cx,
7186            );
7187
7188            // indent from mid-tabstop to full tabstop
7189            view.tab(&Tab, cx);
7190            assert_eq!(view.text(cx), "    one two\nthree\n four");
7191            assert_eq!(
7192                view.selected_display_ranges(cx),
7193                &[
7194                    DisplayPoint::new(0, 4)..DisplayPoint::new(0, 7),
7195                    DisplayPoint::new(0, 8)..DisplayPoint::new(0, 11),
7196                ]
7197            );
7198
7199            // outdent from 1 tabstop to 0 tabstops
7200            view.outdent(&Outdent, cx);
7201            assert_eq!(view.text(cx), "one two\nthree\n four");
7202            assert_eq!(
7203                view.selected_display_ranges(cx),
7204                &[
7205                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 3),
7206                    DisplayPoint::new(0, 4)..DisplayPoint::new(0, 7),
7207                ]
7208            );
7209
7210            // select across line ending
7211            view.select_display_ranges(&[DisplayPoint::new(1, 1)..DisplayPoint::new(2, 0)], cx);
7212
7213            // indent and outdent affect only the preceding line
7214            view.tab(&Tab, cx);
7215            assert_eq!(view.text(cx), "one two\n    three\n four");
7216            assert_eq!(
7217                view.selected_display_ranges(cx),
7218                &[DisplayPoint::new(1, 5)..DisplayPoint::new(2, 0)]
7219            );
7220            view.outdent(&Outdent, cx);
7221            assert_eq!(view.text(cx), "one two\nthree\n four");
7222            assert_eq!(
7223                view.selected_display_ranges(cx),
7224                &[DisplayPoint::new(1, 1)..DisplayPoint::new(2, 0)]
7225            );
7226
7227            // Ensure that indenting/outdenting works when the cursor is at column 0.
7228            view.select_display_ranges(&[DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0)], cx);
7229            view.tab(&Tab, cx);
7230            assert_eq!(view.text(cx), "one two\n    three\n four");
7231            assert_eq!(
7232                view.selected_display_ranges(cx),
7233                &[DisplayPoint::new(1, 4)..DisplayPoint::new(1, 4)]
7234            );
7235
7236            view.select_display_ranges(&[DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0)], cx);
7237            view.outdent(&Outdent, cx);
7238            assert_eq!(view.text(cx), "one two\nthree\n four");
7239            assert_eq!(
7240                view.selected_display_ranges(cx),
7241                &[DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0)]
7242            );
7243        });
7244    }
7245
7246    #[gpui::test]
7247    fn test_backspace(cx: &mut gpui::MutableAppContext) {
7248        let settings = Settings::test(&cx);
7249        let (_, view) = cx.add_window(Default::default(), |cx| {
7250            build_editor(MultiBuffer::build_simple("", cx), settings, cx)
7251        });
7252
7253        view.update(cx, |view, cx| {
7254            view.set_text("one two three\nfour five six\nseven eight nine\nten\n", cx);
7255            view.select_display_ranges(
7256                &[
7257                    // an empty selection - the preceding character is deleted
7258                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
7259                    // one character selected - it is deleted
7260                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 3),
7261                    // a line suffix selected - it is deleted
7262                    DisplayPoint::new(2, 6)..DisplayPoint::new(3, 0),
7263                ],
7264                cx,
7265            );
7266            view.backspace(&Backspace, cx);
7267            assert_eq!(view.text(cx), "oe two three\nfou five six\nseven ten\n");
7268
7269            view.set_text("    one\n        two\n        three\n   four", cx);
7270            view.select_display_ranges(
7271                &[
7272                    // cursors at the the end of leading indent - last indent is deleted
7273                    DisplayPoint::new(0, 4)..DisplayPoint::new(0, 4),
7274                    DisplayPoint::new(1, 8)..DisplayPoint::new(1, 8),
7275                    // cursors inside leading indent - overlapping indent deletions are coalesced
7276                    DisplayPoint::new(2, 4)..DisplayPoint::new(2, 4),
7277                    DisplayPoint::new(2, 5)..DisplayPoint::new(2, 5),
7278                    DisplayPoint::new(2, 6)..DisplayPoint::new(2, 6),
7279                    // cursor at the beginning of a line - preceding newline is deleted
7280                    DisplayPoint::new(3, 0)..DisplayPoint::new(3, 0),
7281                    // selection inside leading indent - only the selected character is deleted
7282                    DisplayPoint::new(3, 2)..DisplayPoint::new(3, 3),
7283                ],
7284                cx,
7285            );
7286            view.backspace(&Backspace, cx);
7287            assert_eq!(view.text(cx), "one\n    two\n  three  four");
7288        });
7289    }
7290
7291    #[gpui::test]
7292    fn test_delete(cx: &mut gpui::MutableAppContext) {
7293        let buffer =
7294            MultiBuffer::build_simple("one two three\nfour five six\nseven eight nine\nten\n", cx);
7295        let settings = Settings::test(&cx);
7296        let (_, view) = cx.add_window(Default::default(), |cx| {
7297            build_editor(buffer.clone(), settings, cx)
7298        });
7299
7300        view.update(cx, |view, cx| {
7301            view.select_display_ranges(
7302                &[
7303                    // an empty selection - the following character is deleted
7304                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
7305                    // one character selected - it is deleted
7306                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 3),
7307                    // a line suffix selected - it is deleted
7308                    DisplayPoint::new(2, 6)..DisplayPoint::new(3, 0),
7309                ],
7310                cx,
7311            );
7312            view.delete(&Delete, cx);
7313        });
7314
7315        assert_eq!(
7316            buffer.read(cx).read(cx).text(),
7317            "on two three\nfou five six\nseven ten\n"
7318        );
7319    }
7320
7321    #[gpui::test]
7322    fn test_delete_line(cx: &mut gpui::MutableAppContext) {
7323        let settings = Settings::test(&cx);
7324        let buffer = MultiBuffer::build_simple("abc\ndef\nghi\n", cx);
7325        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
7326        view.update(cx, |view, cx| {
7327            view.select_display_ranges(
7328                &[
7329                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1),
7330                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 1),
7331                    DisplayPoint::new(3, 0)..DisplayPoint::new(3, 0),
7332                ],
7333                cx,
7334            );
7335            view.delete_line(&DeleteLine, cx);
7336            assert_eq!(view.display_text(cx), "ghi");
7337            assert_eq!(
7338                view.selected_display_ranges(cx),
7339                vec![
7340                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
7341                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1)
7342                ]
7343            );
7344        });
7345
7346        let settings = Settings::test(&cx);
7347        let buffer = MultiBuffer::build_simple("abc\ndef\nghi\n", cx);
7348        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
7349        view.update(cx, |view, cx| {
7350            view.select_display_ranges(&[DisplayPoint::new(2, 0)..DisplayPoint::new(0, 1)], cx);
7351            view.delete_line(&DeleteLine, cx);
7352            assert_eq!(view.display_text(cx), "ghi\n");
7353            assert_eq!(
7354                view.selected_display_ranges(cx),
7355                vec![DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1)]
7356            );
7357        });
7358    }
7359
7360    #[gpui::test]
7361    fn test_duplicate_line(cx: &mut gpui::MutableAppContext) {
7362        let settings = Settings::test(&cx);
7363        let buffer = MultiBuffer::build_simple("abc\ndef\nghi\n", cx);
7364        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
7365        view.update(cx, |view, cx| {
7366            view.select_display_ranges(
7367                &[
7368                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 1),
7369                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
7370                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
7371                    DisplayPoint::new(3, 0)..DisplayPoint::new(3, 0),
7372                ],
7373                cx,
7374            );
7375            view.duplicate_line(&DuplicateLine, cx);
7376            assert_eq!(view.display_text(cx), "abc\nabc\ndef\ndef\nghi\n\n");
7377            assert_eq!(
7378                view.selected_display_ranges(cx),
7379                vec![
7380                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 1),
7381                    DisplayPoint::new(1, 2)..DisplayPoint::new(1, 2),
7382                    DisplayPoint::new(3, 0)..DisplayPoint::new(3, 0),
7383                    DisplayPoint::new(6, 0)..DisplayPoint::new(6, 0),
7384                ]
7385            );
7386        });
7387
7388        let settings = Settings::test(&cx);
7389        let buffer = MultiBuffer::build_simple("abc\ndef\nghi\n", cx);
7390        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
7391        view.update(cx, |view, cx| {
7392            view.select_display_ranges(
7393                &[
7394                    DisplayPoint::new(0, 1)..DisplayPoint::new(1, 1),
7395                    DisplayPoint::new(1, 2)..DisplayPoint::new(2, 1),
7396                ],
7397                cx,
7398            );
7399            view.duplicate_line(&DuplicateLine, cx);
7400            assert_eq!(view.display_text(cx), "abc\ndef\nghi\nabc\ndef\nghi\n");
7401            assert_eq!(
7402                view.selected_display_ranges(cx),
7403                vec![
7404                    DisplayPoint::new(3, 1)..DisplayPoint::new(4, 1),
7405                    DisplayPoint::new(4, 2)..DisplayPoint::new(5, 1),
7406                ]
7407            );
7408        });
7409    }
7410
7411    #[gpui::test]
7412    fn test_move_line_up_down(cx: &mut gpui::MutableAppContext) {
7413        let settings = Settings::test(&cx);
7414        let buffer = MultiBuffer::build_simple(&sample_text(10, 5, 'a'), cx);
7415        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
7416        view.update(cx, |view, cx| {
7417            view.fold_ranges(
7418                vec![
7419                    Point::new(0, 2)..Point::new(1, 2),
7420                    Point::new(2, 3)..Point::new(4, 1),
7421                    Point::new(7, 0)..Point::new(8, 4),
7422                ],
7423                cx,
7424            );
7425            view.select_display_ranges(
7426                &[
7427                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1),
7428                    DisplayPoint::new(3, 1)..DisplayPoint::new(3, 1),
7429                    DisplayPoint::new(3, 2)..DisplayPoint::new(4, 3),
7430                    DisplayPoint::new(5, 0)..DisplayPoint::new(5, 2),
7431                ],
7432                cx,
7433            );
7434            assert_eq!(
7435                view.display_text(cx),
7436                "aa…bbb\nccc…eeee\nfffff\nggggg\n…i\njjjjj"
7437            );
7438
7439            view.move_line_up(&MoveLineUp, cx);
7440            assert_eq!(
7441                view.display_text(cx),
7442                "aa…bbb\nccc…eeee\nggggg\n…i\njjjjj\nfffff"
7443            );
7444            assert_eq!(
7445                view.selected_display_ranges(cx),
7446                vec![
7447                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1),
7448                    DisplayPoint::new(2, 1)..DisplayPoint::new(2, 1),
7449                    DisplayPoint::new(2, 2)..DisplayPoint::new(3, 3),
7450                    DisplayPoint::new(4, 0)..DisplayPoint::new(4, 2)
7451                ]
7452            );
7453        });
7454
7455        view.update(cx, |view, cx| {
7456            view.move_line_down(&MoveLineDown, cx);
7457            assert_eq!(
7458                view.display_text(cx),
7459                "ccc…eeee\naa…bbb\nfffff\nggggg\n…i\njjjjj"
7460            );
7461            assert_eq!(
7462                view.selected_display_ranges(cx),
7463                vec![
7464                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 1),
7465                    DisplayPoint::new(3, 1)..DisplayPoint::new(3, 1),
7466                    DisplayPoint::new(3, 2)..DisplayPoint::new(4, 3),
7467                    DisplayPoint::new(5, 0)..DisplayPoint::new(5, 2)
7468                ]
7469            );
7470        });
7471
7472        view.update(cx, |view, cx| {
7473            view.move_line_down(&MoveLineDown, cx);
7474            assert_eq!(
7475                view.display_text(cx),
7476                "ccc…eeee\nfffff\naa…bbb\nggggg\n…i\njjjjj"
7477            );
7478            assert_eq!(
7479                view.selected_display_ranges(cx),
7480                vec![
7481                    DisplayPoint::new(2, 1)..DisplayPoint::new(2, 1),
7482                    DisplayPoint::new(3, 1)..DisplayPoint::new(3, 1),
7483                    DisplayPoint::new(3, 2)..DisplayPoint::new(4, 3),
7484                    DisplayPoint::new(5, 0)..DisplayPoint::new(5, 2)
7485                ]
7486            );
7487        });
7488
7489        view.update(cx, |view, cx| {
7490            view.move_line_up(&MoveLineUp, cx);
7491            assert_eq!(
7492                view.display_text(cx),
7493                "ccc…eeee\naa…bbb\nggggg\n…i\njjjjj\nfffff"
7494            );
7495            assert_eq!(
7496                view.selected_display_ranges(cx),
7497                vec![
7498                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 1),
7499                    DisplayPoint::new(2, 1)..DisplayPoint::new(2, 1),
7500                    DisplayPoint::new(2, 2)..DisplayPoint::new(3, 3),
7501                    DisplayPoint::new(4, 0)..DisplayPoint::new(4, 2)
7502                ]
7503            );
7504        });
7505    }
7506
7507    #[gpui::test]
7508    fn test_move_line_up_down_with_blocks(cx: &mut gpui::MutableAppContext) {
7509        let settings = Settings::test(&cx);
7510        let buffer = MultiBuffer::build_simple(&sample_text(10, 5, 'a'), cx);
7511        let snapshot = buffer.read(cx).snapshot(cx);
7512        let (_, editor) =
7513            cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
7514        editor.update(cx, |editor, cx| {
7515            editor.insert_blocks(
7516                [BlockProperties {
7517                    position: snapshot.anchor_after(Point::new(2, 0)),
7518                    disposition: BlockDisposition::Below,
7519                    height: 1,
7520                    render: Arc::new(|_| Empty::new().boxed()),
7521                }],
7522                cx,
7523            );
7524            editor.select_ranges([Point::new(2, 0)..Point::new(2, 0)], None, cx);
7525            editor.move_line_down(&MoveLineDown, cx);
7526        });
7527    }
7528
7529    #[gpui::test]
7530    fn test_clipboard(cx: &mut gpui::MutableAppContext) {
7531        let buffer = MultiBuffer::build_simple("one✅ two three four five six ", cx);
7532        let settings = Settings::test(&cx);
7533        let view = cx
7534            .add_window(Default::default(), |cx| {
7535                build_editor(buffer.clone(), settings, cx)
7536            })
7537            .1;
7538
7539        // Cut with three selections. Clipboard text is divided into three slices.
7540        view.update(cx, |view, cx| {
7541            view.select_ranges(vec![0..7, 11..17, 22..27], None, cx);
7542            view.cut(&Cut, cx);
7543            assert_eq!(view.display_text(cx), "two four six ");
7544        });
7545
7546        // Paste with three cursors. Each cursor pastes one slice of the clipboard text.
7547        view.update(cx, |view, cx| {
7548            view.select_ranges(vec![4..4, 9..9, 13..13], None, cx);
7549            view.paste(&Paste, cx);
7550            assert_eq!(view.display_text(cx), "two one✅ four three six five ");
7551            assert_eq!(
7552                view.selected_display_ranges(cx),
7553                &[
7554                    DisplayPoint::new(0, 11)..DisplayPoint::new(0, 11),
7555                    DisplayPoint::new(0, 22)..DisplayPoint::new(0, 22),
7556                    DisplayPoint::new(0, 31)..DisplayPoint::new(0, 31)
7557                ]
7558            );
7559        });
7560
7561        // Paste again but with only two cursors. Since the number of cursors doesn't
7562        // match the number of slices in the clipboard, the entire clipboard text
7563        // is pasted at each cursor.
7564        view.update(cx, |view, cx| {
7565            view.select_ranges(vec![0..0, 31..31], None, cx);
7566            view.handle_input(&Input("( ".into()), cx);
7567            view.paste(&Paste, cx);
7568            view.handle_input(&Input(") ".into()), cx);
7569            assert_eq!(
7570                view.display_text(cx),
7571                "( one✅ three five ) two one✅ four three six five ( one✅ three five ) "
7572            );
7573        });
7574
7575        view.update(cx, |view, cx| {
7576            view.select_ranges(vec![0..0], None, cx);
7577            view.handle_input(&Input("123\n4567\n89\n".into()), cx);
7578            assert_eq!(
7579                view.display_text(cx),
7580                "123\n4567\n89\n( one✅ three five ) two one✅ four three six five ( one✅ three five ) "
7581            );
7582        });
7583
7584        // Cut with three selections, one of which is full-line.
7585        view.update(cx, |view, cx| {
7586            view.select_display_ranges(
7587                &[
7588                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 2),
7589                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 1),
7590                    DisplayPoint::new(2, 0)..DisplayPoint::new(2, 1),
7591                ],
7592                cx,
7593            );
7594            view.cut(&Cut, cx);
7595            assert_eq!(
7596                view.display_text(cx),
7597                "13\n9\n( one✅ three five ) two one✅ four three six five ( one✅ three five ) "
7598            );
7599        });
7600
7601        // Paste with three selections, noticing how the copied selection that was full-line
7602        // gets inserted before the second cursor.
7603        view.update(cx, |view, cx| {
7604            view.select_display_ranges(
7605                &[
7606                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1),
7607                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 1),
7608                    DisplayPoint::new(2, 2)..DisplayPoint::new(2, 3),
7609                ],
7610                cx,
7611            );
7612            view.paste(&Paste, cx);
7613            assert_eq!(
7614                view.display_text(cx),
7615                "123\n4567\n9\n( 8ne✅ three five ) two one✅ four three six five ( one✅ three five ) "
7616            );
7617            assert_eq!(
7618                view.selected_display_ranges(cx),
7619                &[
7620                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
7621                    DisplayPoint::new(2, 1)..DisplayPoint::new(2, 1),
7622                    DisplayPoint::new(3, 3)..DisplayPoint::new(3, 3),
7623                ]
7624            );
7625        });
7626
7627        // Copy with a single cursor only, which writes the whole line into the clipboard.
7628        view.update(cx, |view, cx| {
7629            view.select_display_ranges(&[DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1)], cx);
7630            view.copy(&Copy, cx);
7631        });
7632
7633        // Paste with three selections, noticing how the copied full-line selection is inserted
7634        // before the empty selections but replaces the selection that is non-empty.
7635        view.update(cx, |view, cx| {
7636            view.select_display_ranges(
7637                &[
7638                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1),
7639                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 2),
7640                    DisplayPoint::new(2, 1)..DisplayPoint::new(2, 1),
7641                ],
7642                cx,
7643            );
7644            view.paste(&Paste, cx);
7645            assert_eq!(
7646                view.display_text(cx),
7647                "123\n123\n123\n67\n123\n9\n( 8ne✅ three five ) two one✅ four three six five ( one✅ three five ) "
7648            );
7649            assert_eq!(
7650                view.selected_display_ranges(cx),
7651                &[
7652                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 1),
7653                    DisplayPoint::new(3, 0)..DisplayPoint::new(3, 0),
7654                    DisplayPoint::new(5, 1)..DisplayPoint::new(5, 1),
7655                ]
7656            );
7657        });
7658    }
7659
7660    #[gpui::test]
7661    fn test_select_all(cx: &mut gpui::MutableAppContext) {
7662        let buffer = MultiBuffer::build_simple("abc\nde\nfgh", cx);
7663        let settings = Settings::test(&cx);
7664        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
7665        view.update(cx, |view, cx| {
7666            view.select_all(&SelectAll, cx);
7667            assert_eq!(
7668                view.selected_display_ranges(cx),
7669                &[DisplayPoint::new(0, 0)..DisplayPoint::new(2, 3)]
7670            );
7671        });
7672    }
7673
7674    #[gpui::test]
7675    fn test_select_line(cx: &mut gpui::MutableAppContext) {
7676        let settings = Settings::test(&cx);
7677        let buffer = MultiBuffer::build_simple(&sample_text(6, 5, 'a'), cx);
7678        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
7679        view.update(cx, |view, cx| {
7680            view.select_display_ranges(
7681                &[
7682                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 1),
7683                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
7684                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
7685                    DisplayPoint::new(4, 2)..DisplayPoint::new(4, 2),
7686                ],
7687                cx,
7688            );
7689            view.select_line(&SelectLine, cx);
7690            assert_eq!(
7691                view.selected_display_ranges(cx),
7692                vec![
7693                    DisplayPoint::new(0, 0)..DisplayPoint::new(2, 0),
7694                    DisplayPoint::new(4, 0)..DisplayPoint::new(5, 0),
7695                ]
7696            );
7697        });
7698
7699        view.update(cx, |view, cx| {
7700            view.select_line(&SelectLine, cx);
7701            assert_eq!(
7702                view.selected_display_ranges(cx),
7703                vec![
7704                    DisplayPoint::new(0, 0)..DisplayPoint::new(3, 0),
7705                    DisplayPoint::new(4, 0)..DisplayPoint::new(5, 5),
7706                ]
7707            );
7708        });
7709
7710        view.update(cx, |view, cx| {
7711            view.select_line(&SelectLine, cx);
7712            assert_eq!(
7713                view.selected_display_ranges(cx),
7714                vec![DisplayPoint::new(0, 0)..DisplayPoint::new(5, 5)]
7715            );
7716        });
7717    }
7718
7719    #[gpui::test]
7720    fn test_split_selection_into_lines(cx: &mut gpui::MutableAppContext) {
7721        let settings = Settings::test(&cx);
7722        let buffer = MultiBuffer::build_simple(&sample_text(9, 5, 'a'), cx);
7723        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
7724        view.update(cx, |view, cx| {
7725            view.fold_ranges(
7726                vec![
7727                    Point::new(0, 2)..Point::new(1, 2),
7728                    Point::new(2, 3)..Point::new(4, 1),
7729                    Point::new(7, 0)..Point::new(8, 4),
7730                ],
7731                cx,
7732            );
7733            view.select_display_ranges(
7734                &[
7735                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 1),
7736                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
7737                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
7738                    DisplayPoint::new(4, 4)..DisplayPoint::new(4, 4),
7739                ],
7740                cx,
7741            );
7742            assert_eq!(view.display_text(cx), "aa…bbb\nccc…eeee\nfffff\nggggg\n…i");
7743        });
7744
7745        view.update(cx, |view, cx| {
7746            view.split_selection_into_lines(&SplitSelectionIntoLines, cx);
7747            assert_eq!(
7748                view.display_text(cx),
7749                "aaaaa\nbbbbb\nccc…eeee\nfffff\nggggg\n…i"
7750            );
7751            assert_eq!(
7752                view.selected_display_ranges(cx),
7753                [
7754                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1),
7755                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
7756                    DisplayPoint::new(2, 0)..DisplayPoint::new(2, 0),
7757                    DisplayPoint::new(5, 4)..DisplayPoint::new(5, 4)
7758                ]
7759            );
7760        });
7761
7762        view.update(cx, |view, cx| {
7763            view.select_display_ranges(&[DisplayPoint::new(5, 0)..DisplayPoint::new(0, 1)], cx);
7764            view.split_selection_into_lines(&SplitSelectionIntoLines, cx);
7765            assert_eq!(
7766                view.display_text(cx),
7767                "aaaaa\nbbbbb\nccccc\nddddd\neeeee\nfffff\nggggg\nhhhhh\niiiii"
7768            );
7769            assert_eq!(
7770                view.selected_display_ranges(cx),
7771                [
7772                    DisplayPoint::new(0, 5)..DisplayPoint::new(0, 5),
7773                    DisplayPoint::new(1, 5)..DisplayPoint::new(1, 5),
7774                    DisplayPoint::new(2, 5)..DisplayPoint::new(2, 5),
7775                    DisplayPoint::new(3, 5)..DisplayPoint::new(3, 5),
7776                    DisplayPoint::new(4, 5)..DisplayPoint::new(4, 5),
7777                    DisplayPoint::new(5, 5)..DisplayPoint::new(5, 5),
7778                    DisplayPoint::new(6, 5)..DisplayPoint::new(6, 5),
7779                    DisplayPoint::new(7, 0)..DisplayPoint::new(7, 0)
7780                ]
7781            );
7782        });
7783    }
7784
7785    #[gpui::test]
7786    fn test_add_selection_above_below(cx: &mut gpui::MutableAppContext) {
7787        let settings = Settings::test(&cx);
7788        let buffer = MultiBuffer::build_simple("abc\ndefghi\n\njk\nlmno\n", cx);
7789        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
7790
7791        view.update(cx, |view, cx| {
7792            view.select_display_ranges(&[DisplayPoint::new(1, 3)..DisplayPoint::new(1, 3)], cx);
7793        });
7794        view.update(cx, |view, cx| {
7795            view.add_selection_above(&AddSelectionAbove, cx);
7796            assert_eq!(
7797                view.selected_display_ranges(cx),
7798                vec![
7799                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 3),
7800                    DisplayPoint::new(1, 3)..DisplayPoint::new(1, 3)
7801                ]
7802            );
7803        });
7804
7805        view.update(cx, |view, cx| {
7806            view.add_selection_above(&AddSelectionAbove, cx);
7807            assert_eq!(
7808                view.selected_display_ranges(cx),
7809                vec![
7810                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 3),
7811                    DisplayPoint::new(1, 3)..DisplayPoint::new(1, 3)
7812                ]
7813            );
7814        });
7815
7816        view.update(cx, |view, cx| {
7817            view.add_selection_below(&AddSelectionBelow, cx);
7818            assert_eq!(
7819                view.selected_display_ranges(cx),
7820                vec![DisplayPoint::new(1, 3)..DisplayPoint::new(1, 3)]
7821            );
7822        });
7823
7824        view.update(cx, |view, cx| {
7825            view.add_selection_below(&AddSelectionBelow, cx);
7826            assert_eq!(
7827                view.selected_display_ranges(cx),
7828                vec![
7829                    DisplayPoint::new(1, 3)..DisplayPoint::new(1, 3),
7830                    DisplayPoint::new(4, 3)..DisplayPoint::new(4, 3)
7831                ]
7832            );
7833        });
7834
7835        view.update(cx, |view, cx| {
7836            view.add_selection_below(&AddSelectionBelow, cx);
7837            assert_eq!(
7838                view.selected_display_ranges(cx),
7839                vec![
7840                    DisplayPoint::new(1, 3)..DisplayPoint::new(1, 3),
7841                    DisplayPoint::new(4, 3)..DisplayPoint::new(4, 3)
7842                ]
7843            );
7844        });
7845
7846        view.update(cx, |view, cx| {
7847            view.select_display_ranges(&[DisplayPoint::new(1, 4)..DisplayPoint::new(1, 3)], cx);
7848        });
7849        view.update(cx, |view, cx| {
7850            view.add_selection_below(&AddSelectionBelow, cx);
7851            assert_eq!(
7852                view.selected_display_ranges(cx),
7853                vec![
7854                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 3),
7855                    DisplayPoint::new(4, 4)..DisplayPoint::new(4, 3)
7856                ]
7857            );
7858        });
7859
7860        view.update(cx, |view, cx| {
7861            view.add_selection_below(&AddSelectionBelow, cx);
7862            assert_eq!(
7863                view.selected_display_ranges(cx),
7864                vec![
7865                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 3),
7866                    DisplayPoint::new(4, 4)..DisplayPoint::new(4, 3)
7867                ]
7868            );
7869        });
7870
7871        view.update(cx, |view, cx| {
7872            view.add_selection_above(&AddSelectionAbove, cx);
7873            assert_eq!(
7874                view.selected_display_ranges(cx),
7875                vec![DisplayPoint::new(1, 4)..DisplayPoint::new(1, 3)]
7876            );
7877        });
7878
7879        view.update(cx, |view, cx| {
7880            view.add_selection_above(&AddSelectionAbove, cx);
7881            assert_eq!(
7882                view.selected_display_ranges(cx),
7883                vec![DisplayPoint::new(1, 4)..DisplayPoint::new(1, 3)]
7884            );
7885        });
7886
7887        view.update(cx, |view, cx| {
7888            view.select_display_ranges(&[DisplayPoint::new(0, 1)..DisplayPoint::new(1, 4)], cx);
7889            view.add_selection_below(&AddSelectionBelow, cx);
7890            assert_eq!(
7891                view.selected_display_ranges(cx),
7892                vec![
7893                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 3),
7894                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 4),
7895                    DisplayPoint::new(3, 1)..DisplayPoint::new(3, 2),
7896                ]
7897            );
7898        });
7899
7900        view.update(cx, |view, cx| {
7901            view.add_selection_below(&AddSelectionBelow, cx);
7902            assert_eq!(
7903                view.selected_display_ranges(cx),
7904                vec![
7905                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 3),
7906                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 4),
7907                    DisplayPoint::new(3, 1)..DisplayPoint::new(3, 2),
7908                    DisplayPoint::new(4, 1)..DisplayPoint::new(4, 4),
7909                ]
7910            );
7911        });
7912
7913        view.update(cx, |view, cx| {
7914            view.add_selection_above(&AddSelectionAbove, cx);
7915            assert_eq!(
7916                view.selected_display_ranges(cx),
7917                vec![
7918                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 3),
7919                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 4),
7920                    DisplayPoint::new(3, 1)..DisplayPoint::new(3, 2),
7921                ]
7922            );
7923        });
7924
7925        view.update(cx, |view, cx| {
7926            view.select_display_ranges(&[DisplayPoint::new(4, 3)..DisplayPoint::new(1, 1)], cx);
7927        });
7928        view.update(cx, |view, cx| {
7929            view.add_selection_above(&AddSelectionAbove, cx);
7930            assert_eq!(
7931                view.selected_display_ranges(cx),
7932                vec![
7933                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 1),
7934                    DisplayPoint::new(1, 3)..DisplayPoint::new(1, 1),
7935                    DisplayPoint::new(3, 2)..DisplayPoint::new(3, 1),
7936                    DisplayPoint::new(4, 3)..DisplayPoint::new(4, 1),
7937                ]
7938            );
7939        });
7940
7941        view.update(cx, |view, cx| {
7942            view.add_selection_below(&AddSelectionBelow, cx);
7943            assert_eq!(
7944                view.selected_display_ranges(cx),
7945                vec![
7946                    DisplayPoint::new(1, 3)..DisplayPoint::new(1, 1),
7947                    DisplayPoint::new(3, 2)..DisplayPoint::new(3, 1),
7948                    DisplayPoint::new(4, 3)..DisplayPoint::new(4, 1),
7949                ]
7950            );
7951        });
7952    }
7953
7954    #[gpui::test]
7955    async fn test_select_larger_smaller_syntax_node(cx: &mut gpui::TestAppContext) {
7956        let settings = cx.read(Settings::test);
7957        let language = Arc::new(Language::new(
7958            LanguageConfig::default(),
7959            Some(tree_sitter_rust::language()),
7960        ));
7961
7962        let text = r#"
7963            use mod1::mod2::{mod3, mod4};
7964
7965            fn fn_1(param1: bool, param2: &str) {
7966                let var1 = "text";
7967            }
7968        "#
7969        .unindent();
7970
7971        let buffer = cx.add_model(|cx| Buffer::new(0, text, cx).with_language(language, cx));
7972        let buffer = cx.add_model(|cx| MultiBuffer::singleton(buffer, cx));
7973        let (_, view) = cx.add_window(|cx| build_editor(buffer, settings, cx));
7974        view.condition(&cx, |view, cx| !view.buffer.read(cx).is_parsing(cx))
7975            .await;
7976
7977        view.update(cx, |view, cx| {
7978            view.select_display_ranges(
7979                &[
7980                    DisplayPoint::new(0, 25)..DisplayPoint::new(0, 25),
7981                    DisplayPoint::new(2, 24)..DisplayPoint::new(2, 12),
7982                    DisplayPoint::new(3, 18)..DisplayPoint::new(3, 18),
7983                ],
7984                cx,
7985            );
7986            view.select_larger_syntax_node(&SelectLargerSyntaxNode, cx);
7987        });
7988        assert_eq!(
7989            view.update(cx, |view, cx| view.selected_display_ranges(cx)),
7990            &[
7991                DisplayPoint::new(0, 23)..DisplayPoint::new(0, 27),
7992                DisplayPoint::new(2, 35)..DisplayPoint::new(2, 7),
7993                DisplayPoint::new(3, 15)..DisplayPoint::new(3, 21),
7994            ]
7995        );
7996
7997        view.update(cx, |view, cx| {
7998            view.select_larger_syntax_node(&SelectLargerSyntaxNode, cx);
7999        });
8000        assert_eq!(
8001            view.update(cx, |view, cx| view.selected_display_ranges(cx)),
8002            &[
8003                DisplayPoint::new(0, 16)..DisplayPoint::new(0, 28),
8004                DisplayPoint::new(4, 1)..DisplayPoint::new(2, 0),
8005            ]
8006        );
8007
8008        view.update(cx, |view, cx| {
8009            view.select_larger_syntax_node(&SelectLargerSyntaxNode, cx);
8010        });
8011        assert_eq!(
8012            view.update(cx, |view, cx| view.selected_display_ranges(cx)),
8013            &[DisplayPoint::new(5, 0)..DisplayPoint::new(0, 0)]
8014        );
8015
8016        // Trying to expand the selected syntax node one more time has no effect.
8017        view.update(cx, |view, cx| {
8018            view.select_larger_syntax_node(&SelectLargerSyntaxNode, cx);
8019        });
8020        assert_eq!(
8021            view.update(cx, |view, cx| view.selected_display_ranges(cx)),
8022            &[DisplayPoint::new(5, 0)..DisplayPoint::new(0, 0)]
8023        );
8024
8025        view.update(cx, |view, cx| {
8026            view.select_smaller_syntax_node(&SelectSmallerSyntaxNode, cx);
8027        });
8028        assert_eq!(
8029            view.update(cx, |view, cx| view.selected_display_ranges(cx)),
8030            &[
8031                DisplayPoint::new(0, 16)..DisplayPoint::new(0, 28),
8032                DisplayPoint::new(4, 1)..DisplayPoint::new(2, 0),
8033            ]
8034        );
8035
8036        view.update(cx, |view, cx| {
8037            view.select_smaller_syntax_node(&SelectSmallerSyntaxNode, cx);
8038        });
8039        assert_eq!(
8040            view.update(cx, |view, cx| view.selected_display_ranges(cx)),
8041            &[
8042                DisplayPoint::new(0, 23)..DisplayPoint::new(0, 27),
8043                DisplayPoint::new(2, 35)..DisplayPoint::new(2, 7),
8044                DisplayPoint::new(3, 15)..DisplayPoint::new(3, 21),
8045            ]
8046        );
8047
8048        view.update(cx, |view, cx| {
8049            view.select_smaller_syntax_node(&SelectSmallerSyntaxNode, cx);
8050        });
8051        assert_eq!(
8052            view.update(cx, |view, cx| view.selected_display_ranges(cx)),
8053            &[
8054                DisplayPoint::new(0, 25)..DisplayPoint::new(0, 25),
8055                DisplayPoint::new(2, 24)..DisplayPoint::new(2, 12),
8056                DisplayPoint::new(3, 18)..DisplayPoint::new(3, 18),
8057            ]
8058        );
8059
8060        // Trying to shrink the selected syntax node one more time has no effect.
8061        view.update(cx, |view, cx| {
8062            view.select_smaller_syntax_node(&SelectSmallerSyntaxNode, cx);
8063        });
8064        assert_eq!(
8065            view.update(cx, |view, cx| view.selected_display_ranges(cx)),
8066            &[
8067                DisplayPoint::new(0, 25)..DisplayPoint::new(0, 25),
8068                DisplayPoint::new(2, 24)..DisplayPoint::new(2, 12),
8069                DisplayPoint::new(3, 18)..DisplayPoint::new(3, 18),
8070            ]
8071        );
8072
8073        // Ensure that we keep expanding the selection if the larger selection starts or ends within
8074        // a fold.
8075        view.update(cx, |view, cx| {
8076            view.fold_ranges(
8077                vec![
8078                    Point::new(0, 21)..Point::new(0, 24),
8079                    Point::new(3, 20)..Point::new(3, 22),
8080                ],
8081                cx,
8082            );
8083            view.select_larger_syntax_node(&SelectLargerSyntaxNode, cx);
8084        });
8085        assert_eq!(
8086            view.update(cx, |view, cx| view.selected_display_ranges(cx)),
8087            &[
8088                DisplayPoint::new(0, 16)..DisplayPoint::new(0, 28),
8089                DisplayPoint::new(2, 35)..DisplayPoint::new(2, 7),
8090                DisplayPoint::new(3, 4)..DisplayPoint::new(3, 23),
8091            ]
8092        );
8093    }
8094
8095    #[gpui::test]
8096    async fn test_autoindent_selections(cx: &mut gpui::TestAppContext) {
8097        let settings = cx.read(Settings::test);
8098        let language = Arc::new(
8099            Language::new(
8100                LanguageConfig {
8101                    brackets: vec![
8102                        BracketPair {
8103                            start: "{".to_string(),
8104                            end: "}".to_string(),
8105                            close: false,
8106                            newline: true,
8107                        },
8108                        BracketPair {
8109                            start: "(".to_string(),
8110                            end: ")".to_string(),
8111                            close: false,
8112                            newline: true,
8113                        },
8114                    ],
8115                    ..Default::default()
8116                },
8117                Some(tree_sitter_rust::language()),
8118            )
8119            .with_indents_query(
8120                r#"
8121                (_ "(" ")" @end) @indent
8122                (_ "{" "}" @end) @indent
8123                "#,
8124            )
8125            .unwrap(),
8126        );
8127
8128        let text = "fn a() {}";
8129
8130        let buffer = cx.add_model(|cx| Buffer::new(0, text, cx).with_language(language, cx));
8131        let buffer = cx.add_model(|cx| MultiBuffer::singleton(buffer, cx));
8132        let (_, editor) = cx.add_window(|cx| build_editor(buffer, settings, cx));
8133        editor
8134            .condition(&cx, |editor, cx| !editor.buffer.read(cx).is_parsing(cx))
8135            .await;
8136
8137        editor.update(cx, |editor, cx| {
8138            editor.select_ranges([5..5, 8..8, 9..9], None, cx);
8139            editor.newline(&Newline, cx);
8140            assert_eq!(editor.text(cx), "fn a(\n    \n) {\n    \n}\n");
8141            assert_eq!(
8142                editor.selected_ranges(cx),
8143                &[
8144                    Point::new(1, 4)..Point::new(1, 4),
8145                    Point::new(3, 4)..Point::new(3, 4),
8146                    Point::new(5, 0)..Point::new(5, 0)
8147                ]
8148            );
8149        });
8150    }
8151
8152    #[gpui::test]
8153    async fn test_autoclose_pairs(cx: &mut gpui::TestAppContext) {
8154        let settings = cx.read(Settings::test);
8155        let language = Arc::new(Language::new(
8156            LanguageConfig {
8157                brackets: vec![
8158                    BracketPair {
8159                        start: "{".to_string(),
8160                        end: "}".to_string(),
8161                        close: true,
8162                        newline: true,
8163                    },
8164                    BracketPair {
8165                        start: "/*".to_string(),
8166                        end: " */".to_string(),
8167                        close: true,
8168                        newline: true,
8169                    },
8170                ],
8171                ..Default::default()
8172            },
8173            Some(tree_sitter_rust::language()),
8174        ));
8175
8176        let text = r#"
8177            a
8178
8179            /
8180
8181        "#
8182        .unindent();
8183
8184        let buffer = cx.add_model(|cx| Buffer::new(0, text, cx).with_language(language, cx));
8185        let buffer = cx.add_model(|cx| MultiBuffer::singleton(buffer, cx));
8186        let (_, view) = cx.add_window(|cx| build_editor(buffer, settings, cx));
8187        view.condition(&cx, |view, cx| !view.buffer.read(cx).is_parsing(cx))
8188            .await;
8189
8190        view.update(cx, |view, cx| {
8191            view.select_display_ranges(
8192                &[
8193                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 1),
8194                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
8195                ],
8196                cx,
8197            );
8198            view.handle_input(&Input("{".to_string()), cx);
8199            view.handle_input(&Input("{".to_string()), cx);
8200            view.handle_input(&Input("{".to_string()), cx);
8201            assert_eq!(
8202                view.text(cx),
8203                "
8204                {{{}}}
8205                {{{}}}
8206                /
8207
8208                "
8209                .unindent()
8210            );
8211
8212            view.move_right(&MoveRight, cx);
8213            view.handle_input(&Input("}".to_string()), cx);
8214            view.handle_input(&Input("}".to_string()), cx);
8215            view.handle_input(&Input("}".to_string()), cx);
8216            assert_eq!(
8217                view.text(cx),
8218                "
8219                {{{}}}}
8220                {{{}}}}
8221                /
8222
8223                "
8224                .unindent()
8225            );
8226
8227            view.undo(&Undo, cx);
8228            view.handle_input(&Input("/".to_string()), cx);
8229            view.handle_input(&Input("*".to_string()), cx);
8230            assert_eq!(
8231                view.text(cx),
8232                "
8233                /* */
8234                /* */
8235                /
8236
8237                "
8238                .unindent()
8239            );
8240
8241            view.undo(&Undo, cx);
8242            view.select_display_ranges(
8243                &[
8244                    DisplayPoint::new(2, 1)..DisplayPoint::new(2, 1),
8245                    DisplayPoint::new(3, 0)..DisplayPoint::new(3, 0),
8246                ],
8247                cx,
8248            );
8249            view.handle_input(&Input("*".to_string()), cx);
8250            assert_eq!(
8251                view.text(cx),
8252                "
8253                a
8254
8255                /*
8256                *
8257                "
8258                .unindent()
8259            );
8260
8261            view.finalize_last_transaction(cx);
8262            view.select_display_ranges(&[DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0)], cx);
8263            view.handle_input(&Input("{".to_string()), cx);
8264            assert_eq!(
8265                view.text(cx),
8266                "
8267                {a
8268
8269                /*
8270                *
8271                "
8272                .unindent()
8273            );
8274
8275            view.undo(&Undo, cx);
8276            view.select_display_ranges(&[DisplayPoint::new(0, 0)..DisplayPoint::new(0, 1)], cx);
8277            view.handle_input(&Input("{".to_string()), cx);
8278            assert_eq!(
8279                view.text(cx),
8280                "
8281                {a}
8282
8283                /*
8284                *
8285                "
8286                .unindent()
8287            );
8288            assert_eq!(
8289                view.selected_display_ranges(cx),
8290                [DisplayPoint::new(0, 1)..DisplayPoint::new(0, 2)]
8291            );
8292        });
8293    }
8294
8295    #[gpui::test]
8296    async fn test_snippets(cx: &mut gpui::TestAppContext) {
8297        let settings = cx.read(Settings::test);
8298
8299        let text = "
8300            a. b
8301            a. b
8302            a. b
8303        "
8304        .unindent();
8305        let buffer = cx.update(|cx| MultiBuffer::build_simple(&text, cx));
8306        let (_, editor) = cx.add_window(|cx| build_editor(buffer, settings, cx));
8307
8308        editor.update(cx, |editor, cx| {
8309            let buffer = &editor.snapshot(cx).buffer_snapshot;
8310            let snippet = Snippet::parse("f(${1:one}, ${2:two}, ${1:three})$0").unwrap();
8311            let insertion_ranges = [
8312                Point::new(0, 2).to_offset(buffer)..Point::new(0, 2).to_offset(buffer),
8313                Point::new(1, 2).to_offset(buffer)..Point::new(1, 2).to_offset(buffer),
8314                Point::new(2, 2).to_offset(buffer)..Point::new(2, 2).to_offset(buffer),
8315            ];
8316
8317            editor
8318                .insert_snippet(&insertion_ranges, snippet, cx)
8319                .unwrap();
8320            assert_eq!(
8321                editor.text(cx),
8322                "
8323                    a.f(one, two, three) b
8324                    a.f(one, two, three) b
8325                    a.f(one, two, three) b
8326                "
8327                .unindent()
8328            );
8329            assert_eq!(
8330                editor.selected_ranges::<Point>(cx),
8331                &[
8332                    Point::new(0, 4)..Point::new(0, 7),
8333                    Point::new(0, 14)..Point::new(0, 19),
8334                    Point::new(1, 4)..Point::new(1, 7),
8335                    Point::new(1, 14)..Point::new(1, 19),
8336                    Point::new(2, 4)..Point::new(2, 7),
8337                    Point::new(2, 14)..Point::new(2, 19),
8338                ]
8339            );
8340
8341            // Can't move earlier than the first tab stop
8342            editor.move_to_prev_snippet_tabstop(cx);
8343            assert_eq!(
8344                editor.selected_ranges::<Point>(cx),
8345                &[
8346                    Point::new(0, 4)..Point::new(0, 7),
8347                    Point::new(0, 14)..Point::new(0, 19),
8348                    Point::new(1, 4)..Point::new(1, 7),
8349                    Point::new(1, 14)..Point::new(1, 19),
8350                    Point::new(2, 4)..Point::new(2, 7),
8351                    Point::new(2, 14)..Point::new(2, 19),
8352                ]
8353            );
8354
8355            assert!(editor.move_to_next_snippet_tabstop(cx));
8356            assert_eq!(
8357                editor.selected_ranges::<Point>(cx),
8358                &[
8359                    Point::new(0, 9)..Point::new(0, 12),
8360                    Point::new(1, 9)..Point::new(1, 12),
8361                    Point::new(2, 9)..Point::new(2, 12)
8362                ]
8363            );
8364
8365            editor.move_to_prev_snippet_tabstop(cx);
8366            assert_eq!(
8367                editor.selected_ranges::<Point>(cx),
8368                &[
8369                    Point::new(0, 4)..Point::new(0, 7),
8370                    Point::new(0, 14)..Point::new(0, 19),
8371                    Point::new(1, 4)..Point::new(1, 7),
8372                    Point::new(1, 14)..Point::new(1, 19),
8373                    Point::new(2, 4)..Point::new(2, 7),
8374                    Point::new(2, 14)..Point::new(2, 19),
8375                ]
8376            );
8377
8378            assert!(editor.move_to_next_snippet_tabstop(cx));
8379            assert!(editor.move_to_next_snippet_tabstop(cx));
8380            assert_eq!(
8381                editor.selected_ranges::<Point>(cx),
8382                &[
8383                    Point::new(0, 20)..Point::new(0, 20),
8384                    Point::new(1, 20)..Point::new(1, 20),
8385                    Point::new(2, 20)..Point::new(2, 20)
8386                ]
8387            );
8388
8389            // As soon as the last tab stop is reached, snippet state is gone
8390            editor.move_to_prev_snippet_tabstop(cx);
8391            assert_eq!(
8392                editor.selected_ranges::<Point>(cx),
8393                &[
8394                    Point::new(0, 20)..Point::new(0, 20),
8395                    Point::new(1, 20)..Point::new(1, 20),
8396                    Point::new(2, 20)..Point::new(2, 20)
8397                ]
8398            );
8399        });
8400    }
8401
8402    #[gpui::test]
8403    async fn test_completion(cx: &mut gpui::TestAppContext) {
8404        let settings = cx.read(Settings::test);
8405
8406        let (mut language_server_config, mut fake_servers) = LanguageServerConfig::fake();
8407        language_server_config.set_fake_capabilities(lsp::ServerCapabilities {
8408            completion_provider: Some(lsp::CompletionOptions {
8409                trigger_characters: Some(vec![".".to_string(), ":".to_string()]),
8410                ..Default::default()
8411            }),
8412            ..Default::default()
8413        });
8414        let language = Arc::new(Language::new(
8415            LanguageConfig {
8416                name: "Rust".into(),
8417                path_suffixes: vec!["rs".to_string()],
8418                language_server: Some(language_server_config),
8419                ..Default::default()
8420            },
8421            Some(tree_sitter_rust::language()),
8422        ));
8423
8424        let text = "
8425            one
8426            two
8427            three
8428        "
8429        .unindent();
8430
8431        let fs = FakeFs::new(cx.background().clone());
8432        fs.insert_file("/file.rs", text).await;
8433
8434        let project = Project::test(fs, cx);
8435        project.update(cx, |project, _| project.languages().add(language));
8436
8437        let worktree_id = project
8438            .update(cx, |project, cx| {
8439                project.find_or_create_local_worktree("/file.rs", true, cx)
8440            })
8441            .await
8442            .unwrap()
8443            .0
8444            .read_with(cx, |tree, _| tree.id());
8445        let buffer = project
8446            .update(cx, |project, cx| project.open_buffer((worktree_id, ""), cx))
8447            .await
8448            .unwrap();
8449        let mut fake_server = fake_servers.next().await.unwrap();
8450
8451        let buffer = cx.add_model(|cx| MultiBuffer::singleton(buffer, cx));
8452        let (_, editor) = cx.add_window(|cx| build_editor(buffer, settings, cx));
8453
8454        editor.update(cx, |editor, cx| {
8455            editor.project = Some(project);
8456            editor.select_ranges([Point::new(0, 3)..Point::new(0, 3)], None, cx);
8457            editor.handle_input(&Input(".".to_string()), cx);
8458        });
8459
8460        handle_completion_request(
8461            &mut fake_server,
8462            "/file.rs",
8463            Point::new(0, 4),
8464            vec![
8465                (Point::new(0, 4)..Point::new(0, 4), "first_completion"),
8466                (Point::new(0, 4)..Point::new(0, 4), "second_completion"),
8467            ],
8468        )
8469        .await;
8470        editor
8471            .condition(&cx, |editor, _| editor.context_menu_visible())
8472            .await;
8473
8474        let apply_additional_edits = editor.update(cx, |editor, cx| {
8475            editor.move_down(&MoveDown, cx);
8476            let apply_additional_edits = editor
8477                .confirm_completion(&ConfirmCompletion(None), cx)
8478                .unwrap();
8479            assert_eq!(
8480                editor.text(cx),
8481                "
8482                    one.second_completion
8483                    two
8484                    three
8485                "
8486                .unindent()
8487            );
8488            apply_additional_edits
8489        });
8490
8491        handle_resolve_completion_request(
8492            &mut fake_server,
8493            Some((Point::new(2, 5)..Point::new(2, 5), "\nadditional edit")),
8494        )
8495        .await;
8496        apply_additional_edits.await.unwrap();
8497        assert_eq!(
8498            editor.read_with(cx, |editor, cx| editor.text(cx)),
8499            "
8500                one.second_completion
8501                two
8502                three
8503                additional edit
8504            "
8505            .unindent()
8506        );
8507
8508        editor.update(cx, |editor, cx| {
8509            editor.select_ranges(
8510                [
8511                    Point::new(1, 3)..Point::new(1, 3),
8512                    Point::new(2, 5)..Point::new(2, 5),
8513                ],
8514                None,
8515                cx,
8516            );
8517
8518            editor.handle_input(&Input(" ".to_string()), cx);
8519            assert!(editor.context_menu.is_none());
8520            editor.handle_input(&Input("s".to_string()), cx);
8521            assert!(editor.context_menu.is_none());
8522        });
8523
8524        handle_completion_request(
8525            &mut fake_server,
8526            "/file.rs",
8527            Point::new(2, 7),
8528            vec![
8529                (Point::new(2, 6)..Point::new(2, 7), "fourth_completion"),
8530                (Point::new(2, 6)..Point::new(2, 7), "fifth_completion"),
8531                (Point::new(2, 6)..Point::new(2, 7), "sixth_completion"),
8532            ],
8533        )
8534        .await;
8535        editor
8536            .condition(&cx, |editor, _| editor.context_menu_visible())
8537            .await;
8538
8539        editor.update(cx, |editor, cx| {
8540            editor.handle_input(&Input("i".to_string()), cx);
8541        });
8542
8543        handle_completion_request(
8544            &mut fake_server,
8545            "/file.rs",
8546            Point::new(2, 8),
8547            vec![
8548                (Point::new(2, 6)..Point::new(2, 8), "fourth_completion"),
8549                (Point::new(2, 6)..Point::new(2, 8), "fifth_completion"),
8550                (Point::new(2, 6)..Point::new(2, 8), "sixth_completion"),
8551            ],
8552        )
8553        .await;
8554        editor
8555            .condition(&cx, |editor, _| editor.context_menu_visible())
8556            .await;
8557
8558        let apply_additional_edits = editor.update(cx, |editor, cx| {
8559            let apply_additional_edits = editor
8560                .confirm_completion(&ConfirmCompletion(None), cx)
8561                .unwrap();
8562            assert_eq!(
8563                editor.text(cx),
8564                "
8565                    one.second_completion
8566                    two sixth_completion
8567                    three sixth_completion
8568                    additional edit
8569                "
8570                .unindent()
8571            );
8572            apply_additional_edits
8573        });
8574        handle_resolve_completion_request(&mut fake_server, None).await;
8575        apply_additional_edits.await.unwrap();
8576
8577        async fn handle_completion_request(
8578            fake: &mut FakeLanguageServer,
8579            path: &'static str,
8580            position: Point,
8581            completions: Vec<(Range<Point>, &'static str)>,
8582        ) {
8583            fake.handle_request::<lsp::request::Completion, _>(move |params, _| {
8584                assert_eq!(
8585                    params.text_document_position.text_document.uri,
8586                    lsp::Url::from_file_path(path).unwrap()
8587                );
8588                assert_eq!(
8589                    params.text_document_position.position,
8590                    lsp::Position::new(position.row, position.column)
8591                );
8592                Some(lsp::CompletionResponse::Array(
8593                    completions
8594                        .iter()
8595                        .map(|(range, new_text)| lsp::CompletionItem {
8596                            label: new_text.to_string(),
8597                            text_edit: Some(lsp::CompletionTextEdit::Edit(lsp::TextEdit {
8598                                range: lsp::Range::new(
8599                                    lsp::Position::new(range.start.row, range.start.column),
8600                                    lsp::Position::new(range.start.row, range.start.column),
8601                                ),
8602                                new_text: new_text.to_string(),
8603                            })),
8604                            ..Default::default()
8605                        })
8606                        .collect(),
8607                ))
8608            })
8609            .next()
8610            .await;
8611        }
8612
8613        async fn handle_resolve_completion_request(
8614            fake: &mut FakeLanguageServer,
8615            edit: Option<(Range<Point>, &'static str)>,
8616        ) {
8617            fake.handle_request::<lsp::request::ResolveCompletionItem, _>(move |_, _| {
8618                lsp::CompletionItem {
8619                    additional_text_edits: edit.clone().map(|(range, new_text)| {
8620                        vec![lsp::TextEdit::new(
8621                            lsp::Range::new(
8622                                lsp::Position::new(range.start.row, range.start.column),
8623                                lsp::Position::new(range.end.row, range.end.column),
8624                            ),
8625                            new_text.to_string(),
8626                        )]
8627                    }),
8628                    ..Default::default()
8629                }
8630            })
8631            .next()
8632            .await;
8633        }
8634    }
8635
8636    #[gpui::test]
8637    async fn test_toggle_comment(cx: &mut gpui::TestAppContext) {
8638        let settings = cx.read(Settings::test);
8639        let language = Arc::new(Language::new(
8640            LanguageConfig {
8641                line_comment: Some("// ".to_string()),
8642                ..Default::default()
8643            },
8644            Some(tree_sitter_rust::language()),
8645        ));
8646
8647        let text = "
8648            fn a() {
8649                //b();
8650                // c();
8651                //  d();
8652            }
8653        "
8654        .unindent();
8655
8656        let buffer = cx.add_model(|cx| Buffer::new(0, text, cx).with_language(language, cx));
8657        let buffer = cx.add_model(|cx| MultiBuffer::singleton(buffer, cx));
8658        let (_, view) = cx.add_window(|cx| build_editor(buffer, settings, cx));
8659
8660        view.update(cx, |editor, cx| {
8661            // If multiple selections intersect a line, the line is only
8662            // toggled once.
8663            editor.select_display_ranges(
8664                &[
8665                    DisplayPoint::new(1, 3)..DisplayPoint::new(2, 3),
8666                    DisplayPoint::new(3, 5)..DisplayPoint::new(3, 6),
8667                ],
8668                cx,
8669            );
8670            editor.toggle_comments(&ToggleComments, cx);
8671            assert_eq!(
8672                editor.text(cx),
8673                "
8674                    fn a() {
8675                        b();
8676                        c();
8677                         d();
8678                    }
8679                "
8680                .unindent()
8681            );
8682
8683            // The comment prefix is inserted at the same column for every line
8684            // in a selection.
8685            editor.select_display_ranges(&[DisplayPoint::new(1, 3)..DisplayPoint::new(3, 6)], cx);
8686            editor.toggle_comments(&ToggleComments, cx);
8687            assert_eq!(
8688                editor.text(cx),
8689                "
8690                    fn a() {
8691                        // b();
8692                        // c();
8693                        //  d();
8694                    }
8695                "
8696                .unindent()
8697            );
8698
8699            // If a selection ends at the beginning of a line, that line is not toggled.
8700            editor.select_display_ranges(&[DisplayPoint::new(2, 0)..DisplayPoint::new(3, 0)], cx);
8701            editor.toggle_comments(&ToggleComments, cx);
8702            assert_eq!(
8703                editor.text(cx),
8704                "
8705                        fn a() {
8706                            // b();
8707                            c();
8708                            //  d();
8709                        }
8710                    "
8711                .unindent()
8712            );
8713        });
8714    }
8715
8716    #[gpui::test]
8717    fn test_editing_disjoint_excerpts(cx: &mut gpui::MutableAppContext) {
8718        let settings = Settings::test(cx);
8719        let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(3, 4, 'a'), cx));
8720        let multibuffer = cx.add_model(|cx| {
8721            let mut multibuffer = MultiBuffer::new(0);
8722            multibuffer.push_excerpts(
8723                buffer.clone(),
8724                [
8725                    Point::new(0, 0)..Point::new(0, 4),
8726                    Point::new(1, 0)..Point::new(1, 4),
8727                ],
8728                cx,
8729            );
8730            multibuffer
8731        });
8732
8733        assert_eq!(multibuffer.read(cx).read(cx).text(), "aaaa\nbbbb");
8734
8735        let (_, view) = cx.add_window(Default::default(), |cx| {
8736            build_editor(multibuffer, settings, cx)
8737        });
8738        view.update(cx, |view, cx| {
8739            assert_eq!(view.text(cx), "aaaa\nbbbb");
8740            view.select_ranges(
8741                [
8742                    Point::new(0, 0)..Point::new(0, 0),
8743                    Point::new(1, 0)..Point::new(1, 0),
8744                ],
8745                None,
8746                cx,
8747            );
8748
8749            view.handle_input(&Input("X".to_string()), cx);
8750            assert_eq!(view.text(cx), "Xaaaa\nXbbbb");
8751            assert_eq!(
8752                view.selected_ranges(cx),
8753                [
8754                    Point::new(0, 1)..Point::new(0, 1),
8755                    Point::new(1, 1)..Point::new(1, 1),
8756                ]
8757            )
8758        });
8759    }
8760
8761    #[gpui::test]
8762    fn test_editing_overlapping_excerpts(cx: &mut gpui::MutableAppContext) {
8763        let settings = Settings::test(cx);
8764        let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(3, 4, 'a'), cx));
8765        let multibuffer = cx.add_model(|cx| {
8766            let mut multibuffer = MultiBuffer::new(0);
8767            multibuffer.push_excerpts(
8768                buffer,
8769                [
8770                    Point::new(0, 0)..Point::new(1, 4),
8771                    Point::new(1, 0)..Point::new(2, 4),
8772                ],
8773                cx,
8774            );
8775            multibuffer
8776        });
8777
8778        assert_eq!(
8779            multibuffer.read(cx).read(cx).text(),
8780            "aaaa\nbbbb\nbbbb\ncccc"
8781        );
8782
8783        let (_, view) = cx.add_window(Default::default(), |cx| {
8784            build_editor(multibuffer, settings, cx)
8785        });
8786        view.update(cx, |view, cx| {
8787            view.select_ranges(
8788                [
8789                    Point::new(1, 1)..Point::new(1, 1),
8790                    Point::new(2, 3)..Point::new(2, 3),
8791                ],
8792                None,
8793                cx,
8794            );
8795
8796            view.handle_input(&Input("X".to_string()), cx);
8797            assert_eq!(view.text(cx), "aaaa\nbXbbXb\nbXbbXb\ncccc");
8798            assert_eq!(
8799                view.selected_ranges(cx),
8800                [
8801                    Point::new(1, 2)..Point::new(1, 2),
8802                    Point::new(2, 5)..Point::new(2, 5),
8803                ]
8804            );
8805
8806            view.newline(&Newline, cx);
8807            assert_eq!(view.text(cx), "aaaa\nbX\nbbX\nb\nbX\nbbX\nb\ncccc");
8808            assert_eq!(
8809                view.selected_ranges(cx),
8810                [
8811                    Point::new(2, 0)..Point::new(2, 0),
8812                    Point::new(6, 0)..Point::new(6, 0),
8813                ]
8814            );
8815        });
8816    }
8817
8818    #[gpui::test]
8819    fn test_refresh_selections(cx: &mut gpui::MutableAppContext) {
8820        let settings = Settings::test(cx);
8821        let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(3, 4, 'a'), cx));
8822        let mut excerpt1_id = None;
8823        let multibuffer = cx.add_model(|cx| {
8824            let mut multibuffer = MultiBuffer::new(0);
8825            excerpt1_id = multibuffer
8826                .push_excerpts(
8827                    buffer.clone(),
8828                    [
8829                        Point::new(0, 0)..Point::new(1, 4),
8830                        Point::new(1, 0)..Point::new(2, 4),
8831                    ],
8832                    cx,
8833                )
8834                .into_iter()
8835                .next();
8836            multibuffer
8837        });
8838        assert_eq!(
8839            multibuffer.read(cx).read(cx).text(),
8840            "aaaa\nbbbb\nbbbb\ncccc"
8841        );
8842        let (_, editor) = cx.add_window(Default::default(), |cx| {
8843            let mut editor = build_editor(multibuffer.clone(), settings, cx);
8844            editor.select_ranges(
8845                [
8846                    Point::new(1, 3)..Point::new(1, 3),
8847                    Point::new(2, 1)..Point::new(2, 1),
8848                ],
8849                None,
8850                cx,
8851            );
8852            editor
8853        });
8854
8855        // Refreshing selections is a no-op when excerpts haven't changed.
8856        editor.update(cx, |editor, cx| {
8857            editor.refresh_selections(cx);
8858            assert_eq!(
8859                editor.selected_ranges(cx),
8860                [
8861                    Point::new(1, 3)..Point::new(1, 3),
8862                    Point::new(2, 1)..Point::new(2, 1),
8863                ]
8864            );
8865        });
8866
8867        multibuffer.update(cx, |multibuffer, cx| {
8868            multibuffer.remove_excerpts([&excerpt1_id.unwrap()], cx);
8869        });
8870        editor.update(cx, |editor, cx| {
8871            // Removing an excerpt causes the first selection to become degenerate.
8872            assert_eq!(
8873                editor.selected_ranges(cx),
8874                [
8875                    Point::new(0, 0)..Point::new(0, 0),
8876                    Point::new(0, 1)..Point::new(0, 1)
8877                ]
8878            );
8879
8880            // Refreshing selections will relocate the first selection to the original buffer
8881            // location.
8882            editor.refresh_selections(cx);
8883            assert_eq!(
8884                editor.selected_ranges(cx),
8885                [
8886                    Point::new(0, 1)..Point::new(0, 1),
8887                    Point::new(0, 3)..Point::new(0, 3)
8888                ]
8889            );
8890        });
8891    }
8892
8893    #[gpui::test]
8894    async fn test_extra_newline_insertion(cx: &mut gpui::TestAppContext) {
8895        let settings = cx.read(Settings::test);
8896        let language = Arc::new(Language::new(
8897            LanguageConfig {
8898                brackets: vec![
8899                    BracketPair {
8900                        start: "{".to_string(),
8901                        end: "}".to_string(),
8902                        close: true,
8903                        newline: true,
8904                    },
8905                    BracketPair {
8906                        start: "/* ".to_string(),
8907                        end: " */".to_string(),
8908                        close: true,
8909                        newline: true,
8910                    },
8911                ],
8912                ..Default::default()
8913            },
8914            Some(tree_sitter_rust::language()),
8915        ));
8916
8917        let text = concat!(
8918            "{   }\n",     // Suppress rustfmt
8919            "  x\n",       //
8920            "  /*   */\n", //
8921            "x\n",         //
8922            "{{} }\n",     //
8923        );
8924
8925        let buffer = cx.add_model(|cx| Buffer::new(0, text, cx).with_language(language, cx));
8926        let buffer = cx.add_model(|cx| MultiBuffer::singleton(buffer, cx));
8927        let (_, view) = cx.add_window(|cx| build_editor(buffer, settings, cx));
8928        view.condition(&cx, |view, cx| !view.buffer.read(cx).is_parsing(cx))
8929            .await;
8930
8931        view.update(cx, |view, cx| {
8932            view.select_display_ranges(
8933                &[
8934                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 3),
8935                    DisplayPoint::new(2, 5)..DisplayPoint::new(2, 5),
8936                    DisplayPoint::new(4, 4)..DisplayPoint::new(4, 4),
8937                ],
8938                cx,
8939            );
8940            view.newline(&Newline, cx);
8941
8942            assert_eq!(
8943                view.buffer().read(cx).read(cx).text(),
8944                concat!(
8945                    "{ \n",    // Suppress rustfmt
8946                    "\n",      //
8947                    "}\n",     //
8948                    "  x\n",   //
8949                    "  /* \n", //
8950                    "  \n",    //
8951                    "  */\n",  //
8952                    "x\n",     //
8953                    "{{} \n",  //
8954                    "}\n",     //
8955                )
8956            );
8957        });
8958    }
8959
8960    #[gpui::test]
8961    fn test_highlighted_ranges(cx: &mut gpui::MutableAppContext) {
8962        let buffer = MultiBuffer::build_simple(&sample_text(16, 8, 'a'), cx);
8963        let settings = Settings::test(&cx);
8964        let (_, editor) = cx.add_window(Default::default(), |cx| {
8965            build_editor(buffer.clone(), settings, cx)
8966        });
8967
8968        editor.update(cx, |editor, cx| {
8969            struct Type1;
8970            struct Type2;
8971
8972            let buffer = buffer.read(cx).snapshot(cx);
8973
8974            let anchor_range = |range: Range<Point>| {
8975                buffer.anchor_after(range.start)..buffer.anchor_after(range.end)
8976            };
8977
8978            editor.highlight_background::<Type1>(
8979                vec![
8980                    anchor_range(Point::new(2, 1)..Point::new(2, 3)),
8981                    anchor_range(Point::new(4, 2)..Point::new(4, 4)),
8982                    anchor_range(Point::new(6, 3)..Point::new(6, 5)),
8983                    anchor_range(Point::new(8, 4)..Point::new(8, 6)),
8984                ],
8985                Color::red(),
8986                cx,
8987            );
8988            editor.highlight_background::<Type2>(
8989                vec![
8990                    anchor_range(Point::new(3, 2)..Point::new(3, 5)),
8991                    anchor_range(Point::new(5, 3)..Point::new(5, 6)),
8992                    anchor_range(Point::new(7, 4)..Point::new(7, 7)),
8993                    anchor_range(Point::new(9, 5)..Point::new(9, 8)),
8994                ],
8995                Color::green(),
8996                cx,
8997            );
8998
8999            let snapshot = editor.snapshot(cx);
9000            let mut highlighted_ranges = editor.background_highlights_in_range(
9001                anchor_range(Point::new(3, 4)..Point::new(7, 4)),
9002                &snapshot,
9003            );
9004            // Enforce a consistent ordering based on color without relying on the ordering of the
9005            // highlight's `TypeId` which is non-deterministic.
9006            highlighted_ranges.sort_unstable_by_key(|(_, color)| *color);
9007            assert_eq!(
9008                highlighted_ranges,
9009                &[
9010                    (
9011                        DisplayPoint::new(3, 2)..DisplayPoint::new(3, 5),
9012                        Color::green(),
9013                    ),
9014                    (
9015                        DisplayPoint::new(5, 3)..DisplayPoint::new(5, 6),
9016                        Color::green(),
9017                    ),
9018                    (
9019                        DisplayPoint::new(4, 2)..DisplayPoint::new(4, 4),
9020                        Color::red(),
9021                    ),
9022                    (
9023                        DisplayPoint::new(6, 3)..DisplayPoint::new(6, 5),
9024                        Color::red(),
9025                    ),
9026                ]
9027            );
9028            assert_eq!(
9029                editor.background_highlights_in_range(
9030                    anchor_range(Point::new(5, 6)..Point::new(6, 4)),
9031                    &snapshot,
9032                ),
9033                &[(
9034                    DisplayPoint::new(6, 3)..DisplayPoint::new(6, 5),
9035                    Color::red(),
9036                )]
9037            );
9038        });
9039    }
9040
9041    #[test]
9042    fn test_combine_syntax_and_fuzzy_match_highlights() {
9043        let string = "abcdefghijklmnop";
9044        let default = HighlightStyle::default();
9045        let syntax_ranges = [
9046            (
9047                0..3,
9048                HighlightStyle {
9049                    color: Color::red(),
9050                    ..default
9051                },
9052            ),
9053            (
9054                4..8,
9055                HighlightStyle {
9056                    color: Color::green(),
9057                    ..default
9058                },
9059            ),
9060        ];
9061        let match_indices = [4, 6, 7, 8];
9062        assert_eq!(
9063            combine_syntax_and_fuzzy_match_highlights(
9064                &string,
9065                default,
9066                syntax_ranges.into_iter(),
9067                &match_indices,
9068            ),
9069            &[
9070                (
9071                    0..3,
9072                    HighlightStyle {
9073                        color: Color::red(),
9074                        ..default
9075                    },
9076                ),
9077                (
9078                    4..5,
9079                    HighlightStyle {
9080                        color: Color::green(),
9081                        font_properties: *fonts::Properties::default().weight(fonts::Weight::BOLD),
9082                        ..default
9083                    },
9084                ),
9085                (
9086                    5..6,
9087                    HighlightStyle {
9088                        color: Color::green(),
9089                        ..default
9090                    },
9091                ),
9092                (
9093                    6..8,
9094                    HighlightStyle {
9095                        color: Color::green(),
9096                        font_properties: *fonts::Properties::default().weight(fonts::Weight::BOLD),
9097                        ..default
9098                    },
9099                ),
9100                (
9101                    8..9,
9102                    HighlightStyle {
9103                        font_properties: *fonts::Properties::default().weight(fonts::Weight::BOLD),
9104                        ..default
9105                    },
9106                ),
9107            ]
9108        );
9109    }
9110
9111    fn empty_range(row: usize, column: usize) -> Range<DisplayPoint> {
9112        let point = DisplayPoint::new(row as u32, column as u32);
9113        point..point
9114    }
9115
9116    fn build_editor(
9117        buffer: ModelHandle<MultiBuffer>,
9118        settings: Settings,
9119        cx: &mut ViewContext<Editor>,
9120    ) -> Editor {
9121        let settings = watch::channel_with(settings);
9122        Editor::new(EditorMode::Full, buffer, None, settings.1, None, cx)
9123    }
9124}
9125
9126trait RangeExt<T> {
9127    fn sorted(&self) -> Range<T>;
9128    fn to_inclusive(&self) -> RangeInclusive<T>;
9129}
9130
9131impl<T: Ord + Clone> RangeExt<T> for Range<T> {
9132    fn sorted(&self) -> Self {
9133        cmp::min(&self.start, &self.end).clone()..cmp::max(&self.start, &self.end).clone()
9134    }
9135
9136    fn to_inclusive(&self) -> RangeInclusive<T> {
9137        self.start.clone()..=self.end.clone()
9138    }
9139}