1use crate::{
   2    assistant_settings::AssistantSettings, humanize_token_count, prompts::generate_content_prompt,
   3    AssistantPanel, AssistantPanelEvent, CompletionProvider, Hunk, LanguageModelRequest,
   4    LanguageModelRequestMessage, Role, StreamingDiff,
   5};
   6use anyhow::{anyhow, Context as _, Result};
   7use client::telemetry::Telemetry;
   8use collections::{hash_map, HashMap, HashSet, VecDeque};
   9use editor::{
  10    actions::{MoveDown, MoveUp, SelectAll},
  11    display_map::{
  12        BlockContext, BlockDisposition, BlockProperties, BlockStyle, CustomBlockId, RenderBlock,
  13        ToDisplayPoint,
  14    },
  15    Anchor, AnchorRangeExt, Editor, EditorElement, EditorEvent, EditorMode, EditorStyle,
  16    ExcerptRange, GutterDimensions, MultiBuffer, MultiBufferSnapshot, ToOffset, ToPoint,
  17};
  18use fs::Fs;
  19use futures::{
  20    channel::mpsc,
  21    future::LocalBoxFuture,
  22    stream::{self, BoxStream},
  23    SinkExt, Stream, StreamExt,
  24};
  25use gpui::{
  26    point, AppContext, EventEmitter, FocusHandle, FocusableView, FontStyle, Global, HighlightStyle,
  27    Model, ModelContext, Subscription, Task, TextStyle, UpdateGlobal, View, ViewContext, WeakView,
  28    WhiteSpace, WindowContext,
  29};
  30use language::{Buffer, Point, Selection, TransactionId};
  31use multi_buffer::MultiBufferRow;
  32use parking_lot::Mutex;
  33use rope::Rope;
  34use settings::{update_settings_file, Settings};
  35use similar::TextDiff;
  36use smol::future::FutureExt;
  37use std::{
  38    cmp,
  39    future::Future,
  40    mem,
  41    ops::{Range, RangeInclusive},
  42    pin::Pin,
  43    sync::Arc,
  44    task::{self, Poll},
  45    time::{Duration, Instant},
  46};
  47use theme::ThemeSettings;
  48use ui::{prelude::*, ContextMenu, PopoverMenu, Tooltip};
  49use util::RangeExt;
  50use workspace::{notifications::NotificationId, Toast, Workspace};
  51
  52pub fn init(fs: Arc<dyn Fs>, telemetry: Arc<Telemetry>, cx: &mut AppContext) {
  53    cx.set_global(InlineAssistant::new(fs, telemetry));
  54}
  55
  56const PROMPT_HISTORY_MAX_LEN: usize = 20;
  57
  58pub struct InlineAssistant {
  59    next_assist_id: InlineAssistId,
  60    next_assist_group_id: InlineAssistGroupId,
  61    assists: HashMap<InlineAssistId, InlineAssist>,
  62    assists_by_editor: HashMap<WeakView<Editor>, EditorInlineAssists>,
  63    assist_groups: HashMap<InlineAssistGroupId, InlineAssistGroup>,
  64    prompt_history: VecDeque<String>,
  65    telemetry: Option<Arc<Telemetry>>,
  66    fs: Arc<dyn Fs>,
  67}
  68
  69impl Global for InlineAssistant {}
  70
  71impl InlineAssistant {
  72    pub fn new(fs: Arc<dyn Fs>, telemetry: Arc<Telemetry>) -> Self {
  73        Self {
  74            next_assist_id: InlineAssistId::default(),
  75            next_assist_group_id: InlineAssistGroupId::default(),
  76            assists: HashMap::default(),
  77            assists_by_editor: HashMap::default(),
  78            assist_groups: HashMap::default(),
  79            prompt_history: VecDeque::default(),
  80            telemetry: Some(telemetry),
  81            fs,
  82        }
  83    }
  84
  85    pub fn assist(
  86        &mut self,
  87        editor: &View<Editor>,
  88        workspace: Option<WeakView<Workspace>>,
  89        assistant_panel: Option<&View<AssistantPanel>>,
  90        initial_prompt: Option<String>,
  91        cx: &mut WindowContext,
  92    ) {
  93        let snapshot = editor.read(cx).buffer().read(cx).snapshot(cx);
  94
  95        let mut selections = Vec::<Selection<Point>>::new();
  96        let mut newest_selection = None;
  97        for mut selection in editor.read(cx).selections.all::<Point>(cx) {
  98            if selection.end > selection.start {
  99                selection.start.column = 0;
 100                // If the selection ends at the start of the line, we don't want to include it.
 101                if selection.end.column == 0 {
 102                    selection.end.row -= 1;
 103                }
 104                selection.end.column = snapshot.line_len(MultiBufferRow(selection.end.row));
 105            }
 106
 107            if let Some(prev_selection) = selections.last_mut() {
 108                if selection.start <= prev_selection.end {
 109                    prev_selection.end = selection.end;
 110                    continue;
 111                }
 112            }
 113
 114            let latest_selection = newest_selection.get_or_insert_with(|| selection.clone());
 115            if selection.id > latest_selection.id {
 116                *latest_selection = selection.clone();
 117            }
 118            selections.push(selection);
 119        }
 120        let newest_selection = newest_selection.unwrap();
 121
 122        let mut codegen_ranges = Vec::new();
 123        for (excerpt_id, buffer, buffer_range) in
 124            snapshot.excerpts_in_ranges(selections.iter().map(|selection| {
 125                snapshot.anchor_before(selection.start)..snapshot.anchor_after(selection.end)
 126            }))
 127        {
 128            let start = Anchor {
 129                buffer_id: Some(buffer.remote_id()),
 130                excerpt_id,
 131                text_anchor: buffer.anchor_before(buffer_range.start),
 132            };
 133            let end = Anchor {
 134                buffer_id: Some(buffer.remote_id()),
 135                excerpt_id,
 136                text_anchor: buffer.anchor_after(buffer_range.end),
 137            };
 138            codegen_ranges.push(start..end);
 139        }
 140
 141        let assist_group_id = self.next_assist_group_id.post_inc();
 142        let prompt_buffer =
 143            cx.new_model(|cx| Buffer::local(initial_prompt.unwrap_or_default(), cx));
 144        let prompt_buffer = cx.new_model(|cx| MultiBuffer::singleton(prompt_buffer, cx));
 145
 146        let mut assists = Vec::new();
 147        let mut assist_to_focus = None;
 148        for range in codegen_ranges {
 149            let assist_id = self.next_assist_id.post_inc();
 150            let codegen = cx.new_model(|cx| {
 151                Codegen::new(
 152                    editor.read(cx).buffer().clone(),
 153                    range.clone(),
 154                    None,
 155                    self.telemetry.clone(),
 156                    cx,
 157                )
 158            });
 159
 160            let gutter_dimensions = Arc::new(Mutex::new(GutterDimensions::default()));
 161            let prompt_editor = cx.new_view(|cx| {
 162                PromptEditor::new(
 163                    assist_id,
 164                    gutter_dimensions.clone(),
 165                    self.prompt_history.clone(),
 166                    prompt_buffer.clone(),
 167                    codegen.clone(),
 168                    editor,
 169                    assistant_panel,
 170                    workspace.clone(),
 171                    self.fs.clone(),
 172                    cx,
 173                )
 174            });
 175
 176            if assist_to_focus.is_none() {
 177                let focus_assist = if newest_selection.reversed {
 178                    range.start.to_point(&snapshot) == newest_selection.start
 179                } else {
 180                    range.end.to_point(&snapshot) == newest_selection.end
 181                };
 182                if focus_assist {
 183                    assist_to_focus = Some(assist_id);
 184                }
 185            }
 186
 187            let [prompt_block_id, end_block_id] =
 188                self.insert_assist_blocks(editor, &range, &prompt_editor, cx);
 189
 190            assists.push((assist_id, prompt_editor, prompt_block_id, end_block_id));
 191        }
 192
 193        let editor_assists = self
 194            .assists_by_editor
 195            .entry(editor.downgrade())
 196            .or_insert_with(|| EditorInlineAssists::new(&editor, cx));
 197        let mut assist_group = InlineAssistGroup::new();
 198        for (assist_id, prompt_editor, prompt_block_id, end_block_id) in assists {
 199            self.assists.insert(
 200                assist_id,
 201                InlineAssist::new(
 202                    assist_id,
 203                    assist_group_id,
 204                    assistant_panel.is_some(),
 205                    editor,
 206                    &prompt_editor,
 207                    prompt_block_id,
 208                    end_block_id,
 209                    prompt_editor.read(cx).codegen.clone(),
 210                    workspace.clone(),
 211                    cx,
 212                ),
 213            );
 214            assist_group.assist_ids.push(assist_id);
 215            editor_assists.assist_ids.push(assist_id);
 216        }
 217        self.assist_groups.insert(assist_group_id, assist_group);
 218
 219        if let Some(assist_id) = assist_to_focus {
 220            self.focus_assist(assist_id, cx);
 221        }
 222    }
 223
 224    #[allow(clippy::too_many_arguments)]
 225    pub fn suggest_assist(
 226        &mut self,
 227        editor: &View<Editor>,
 228        mut range: Range<Anchor>,
 229        initial_prompt: String,
 230        initial_insertion: Option<String>,
 231        workspace: Option<WeakView<Workspace>>,
 232        assistant_panel: Option<&View<AssistantPanel>>,
 233        cx: &mut WindowContext,
 234    ) -> InlineAssistId {
 235        let assist_group_id = self.next_assist_group_id.post_inc();
 236        let prompt_buffer = cx.new_model(|cx| Buffer::local(&initial_prompt, cx));
 237        let prompt_buffer = cx.new_model(|cx| MultiBuffer::singleton(prompt_buffer, cx));
 238
 239        let assist_id = self.next_assist_id.post_inc();
 240
 241        let buffer = editor.read(cx).buffer().clone();
 242        let prepend_transaction_id = initial_insertion.and_then(|initial_insertion| {
 243            buffer.update(cx, |buffer, cx| {
 244                buffer.start_transaction(cx);
 245                buffer.edit([(range.start..range.start, initial_insertion)], None, cx);
 246                buffer.end_transaction(cx)
 247            })
 248        });
 249
 250        range.start = range.start.bias_left(&buffer.read(cx).read(cx));
 251        range.end = range.end.bias_right(&buffer.read(cx).read(cx));
 252
 253        let codegen = cx.new_model(|cx| {
 254            Codegen::new(
 255                editor.read(cx).buffer().clone(),
 256                range.clone(),
 257                prepend_transaction_id,
 258                self.telemetry.clone(),
 259                cx,
 260            )
 261        });
 262
 263        let gutter_dimensions = Arc::new(Mutex::new(GutterDimensions::default()));
 264        let prompt_editor = cx.new_view(|cx| {
 265            PromptEditor::new(
 266                assist_id,
 267                gutter_dimensions.clone(),
 268                self.prompt_history.clone(),
 269                prompt_buffer.clone(),
 270                codegen.clone(),
 271                editor,
 272                assistant_panel,
 273                workspace.clone(),
 274                self.fs.clone(),
 275                cx,
 276            )
 277        });
 278
 279        let [prompt_block_id, end_block_id] =
 280            self.insert_assist_blocks(editor, &range, &prompt_editor, cx);
 281
 282        let editor_assists = self
 283            .assists_by_editor
 284            .entry(editor.downgrade())
 285            .or_insert_with(|| EditorInlineAssists::new(&editor, cx));
 286
 287        let mut assist_group = InlineAssistGroup::new();
 288        self.assists.insert(
 289            assist_id,
 290            InlineAssist::new(
 291                assist_id,
 292                assist_group_id,
 293                assistant_panel.is_some(),
 294                editor,
 295                &prompt_editor,
 296                prompt_block_id,
 297                end_block_id,
 298                prompt_editor.read(cx).codegen.clone(),
 299                workspace.clone(),
 300                cx,
 301            ),
 302        );
 303        assist_group.assist_ids.push(assist_id);
 304        editor_assists.assist_ids.push(assist_id);
 305        self.assist_groups.insert(assist_group_id, assist_group);
 306        assist_id
 307    }
 308
 309    fn insert_assist_blocks(
 310        &self,
 311        editor: &View<Editor>,
 312        range: &Range<Anchor>,
 313        prompt_editor: &View<PromptEditor>,
 314        cx: &mut WindowContext,
 315    ) -> [CustomBlockId; 2] {
 316        let assist_blocks = vec![
 317            BlockProperties {
 318                style: BlockStyle::Sticky,
 319                position: range.start,
 320                height: prompt_editor.read(cx).height_in_lines,
 321                render: build_assist_editor_renderer(prompt_editor),
 322                disposition: BlockDisposition::Above,
 323            },
 324            BlockProperties {
 325                style: BlockStyle::Sticky,
 326                position: range.end,
 327                height: 1,
 328                render: Box::new(|cx| {
 329                    v_flex()
 330                        .h_full()
 331                        .w_full()
 332                        .border_t_1()
 333                        .border_color(cx.theme().status().info_border)
 334                        .into_any_element()
 335                }),
 336                disposition: BlockDisposition::Below,
 337            },
 338        ];
 339
 340        editor.update(cx, |editor, cx| {
 341            let block_ids = editor.insert_blocks(assist_blocks, None, cx);
 342            [block_ids[0], block_ids[1]]
 343        })
 344    }
 345
 346    fn handle_prompt_editor_focus_in(&mut self, assist_id: InlineAssistId, cx: &mut WindowContext) {
 347        let assist = &self.assists[&assist_id];
 348        let Some(decorations) = assist.decorations.as_ref() else {
 349            return;
 350        };
 351        let assist_group = self.assist_groups.get_mut(&assist.group_id).unwrap();
 352        let editor_assists = self.assists_by_editor.get_mut(&assist.editor).unwrap();
 353
 354        assist_group.active_assist_id = Some(assist_id);
 355        if assist_group.linked {
 356            for assist_id in &assist_group.assist_ids {
 357                if let Some(decorations) = self.assists[assist_id].decorations.as_ref() {
 358                    decorations.prompt_editor.update(cx, |prompt_editor, cx| {
 359                        prompt_editor.set_show_cursor_when_unfocused(true, cx)
 360                    });
 361                }
 362            }
 363        }
 364
 365        assist
 366            .editor
 367            .update(cx, |editor, cx| {
 368                let scroll_top = editor.scroll_position(cx).y;
 369                let scroll_bottom = scroll_top + editor.visible_line_count().unwrap_or(0.);
 370                let prompt_row = editor
 371                    .row_for_block(decorations.prompt_block_id, cx)
 372                    .unwrap()
 373                    .0 as f32;
 374
 375                if (scroll_top..scroll_bottom).contains(&prompt_row) {
 376                    editor_assists.scroll_lock = Some(InlineAssistScrollLock {
 377                        assist_id,
 378                        distance_from_top: prompt_row - scroll_top,
 379                    });
 380                } else {
 381                    editor_assists.scroll_lock = None;
 382                }
 383            })
 384            .ok();
 385    }
 386
 387    fn handle_prompt_editor_focus_out(
 388        &mut self,
 389        assist_id: InlineAssistId,
 390        cx: &mut WindowContext,
 391    ) {
 392        let assist = &self.assists[&assist_id];
 393        let assist_group = self.assist_groups.get_mut(&assist.group_id).unwrap();
 394        if assist_group.active_assist_id == Some(assist_id) {
 395            assist_group.active_assist_id = None;
 396            if assist_group.linked {
 397                for assist_id in &assist_group.assist_ids {
 398                    if let Some(decorations) = self.assists[assist_id].decorations.as_ref() {
 399                        decorations.prompt_editor.update(cx, |prompt_editor, cx| {
 400                            prompt_editor.set_show_cursor_when_unfocused(false, cx)
 401                        });
 402                    }
 403                }
 404            }
 405        }
 406    }
 407
 408    fn handle_prompt_editor_event(
 409        &mut self,
 410        prompt_editor: View<PromptEditor>,
 411        event: &PromptEditorEvent,
 412        cx: &mut WindowContext,
 413    ) {
 414        let assist_id = prompt_editor.read(cx).id;
 415        match event {
 416            PromptEditorEvent::StartRequested => {
 417                self.start_assist(assist_id, cx);
 418            }
 419            PromptEditorEvent::StopRequested => {
 420                self.stop_assist(assist_id, cx);
 421            }
 422            PromptEditorEvent::ConfirmRequested => {
 423                self.finish_assist(assist_id, false, cx);
 424            }
 425            PromptEditorEvent::CancelRequested => {
 426                self.finish_assist(assist_id, true, cx);
 427            }
 428            PromptEditorEvent::DismissRequested => {
 429                self.dismiss_assist(assist_id, cx);
 430            }
 431            PromptEditorEvent::Resized { height_in_lines } => {
 432                self.resize_assist(assist_id, *height_in_lines, cx);
 433            }
 434        }
 435    }
 436
 437    fn handle_editor_newline(&mut self, editor: View<Editor>, cx: &mut WindowContext) {
 438        let Some(editor_assists) = self.assists_by_editor.get(&editor.downgrade()) else {
 439            return;
 440        };
 441
 442        let editor = editor.read(cx);
 443        if editor.selections.count() == 1 {
 444            let selection = editor.selections.newest::<usize>(cx);
 445            let buffer = editor.buffer().read(cx).snapshot(cx);
 446            for assist_id in &editor_assists.assist_ids {
 447                let assist = &self.assists[assist_id];
 448                let assist_range = assist.codegen.read(cx).range.to_offset(&buffer);
 449                if assist_range.contains(&selection.start) && assist_range.contains(&selection.end)
 450                {
 451                    if matches!(assist.codegen.read(cx).status, CodegenStatus::Pending) {
 452                        self.dismiss_assist(*assist_id, cx);
 453                    } else {
 454                        self.finish_assist(*assist_id, false, cx);
 455                    }
 456
 457                    return;
 458                }
 459            }
 460        }
 461
 462        cx.propagate();
 463    }
 464
 465    fn handle_editor_cancel(&mut self, editor: View<Editor>, cx: &mut WindowContext) {
 466        let Some(editor_assists) = self.assists_by_editor.get(&editor.downgrade()) else {
 467            return;
 468        };
 469
 470        let editor = editor.read(cx);
 471        if editor.selections.count() == 1 {
 472            let selection = editor.selections.newest::<usize>(cx);
 473            let buffer = editor.buffer().read(cx).snapshot(cx);
 474            for assist_id in &editor_assists.assist_ids {
 475                let assist = &self.assists[assist_id];
 476                let assist_range = assist.codegen.read(cx).range.to_offset(&buffer);
 477                if assist.decorations.is_some()
 478                    && assist_range.contains(&selection.start)
 479                    && assist_range.contains(&selection.end)
 480                {
 481                    self.focus_assist(*assist_id, cx);
 482                    return;
 483                }
 484            }
 485        }
 486
 487        cx.propagate();
 488    }
 489
 490    fn handle_editor_release(&mut self, editor: WeakView<Editor>, cx: &mut WindowContext) {
 491        if let Some(editor_assists) = self.assists_by_editor.get_mut(&editor) {
 492            for assist_id in editor_assists.assist_ids.clone() {
 493                self.finish_assist(assist_id, true, cx);
 494            }
 495        }
 496    }
 497
 498    fn handle_editor_change(&mut self, editor: View<Editor>, cx: &mut WindowContext) {
 499        let Some(editor_assists) = self.assists_by_editor.get(&editor.downgrade()) else {
 500            return;
 501        };
 502        let Some(scroll_lock) = editor_assists.scroll_lock.as_ref() else {
 503            return;
 504        };
 505        let assist = &self.assists[&scroll_lock.assist_id];
 506        let Some(decorations) = assist.decorations.as_ref() else {
 507            return;
 508        };
 509
 510        editor.update(cx, |editor, cx| {
 511            let scroll_position = editor.scroll_position(cx);
 512            let target_scroll_top = editor
 513                .row_for_block(decorations.prompt_block_id, cx)
 514                .unwrap()
 515                .0 as f32
 516                - scroll_lock.distance_from_top;
 517            if target_scroll_top != scroll_position.y {
 518                editor.set_scroll_position(point(scroll_position.x, target_scroll_top), cx);
 519            }
 520        });
 521    }
 522
 523    fn handle_editor_event(
 524        &mut self,
 525        editor: View<Editor>,
 526        event: &EditorEvent,
 527        cx: &mut WindowContext,
 528    ) {
 529        let Some(editor_assists) = self.assists_by_editor.get_mut(&editor.downgrade()) else {
 530            return;
 531        };
 532
 533        match event {
 534            EditorEvent::Saved => {
 535                for assist_id in editor_assists.assist_ids.clone() {
 536                    let assist = &self.assists[&assist_id];
 537                    if let CodegenStatus::Done = &assist.codegen.read(cx).status {
 538                        self.finish_assist(assist_id, false, cx)
 539                    }
 540                }
 541            }
 542            EditorEvent::Edited { transaction_id } => {
 543                let buffer = editor.read(cx).buffer().read(cx);
 544                let edited_ranges =
 545                    buffer.edited_ranges_for_transaction::<usize>(*transaction_id, cx);
 546                let snapshot = buffer.snapshot(cx);
 547
 548                for assist_id in editor_assists.assist_ids.clone() {
 549                    let assist = &self.assists[&assist_id];
 550                    if matches!(
 551                        assist.codegen.read(cx).status,
 552                        CodegenStatus::Error(_) | CodegenStatus::Done
 553                    ) {
 554                        let assist_range = assist.codegen.read(cx).range.to_offset(&snapshot);
 555                        if edited_ranges
 556                            .iter()
 557                            .any(|range| range.overlaps(&assist_range))
 558                        {
 559                            self.finish_assist(assist_id, false, cx);
 560                        }
 561                    }
 562                }
 563            }
 564            EditorEvent::ScrollPositionChanged { .. } => {
 565                if let Some(scroll_lock) = editor_assists.scroll_lock.as_ref() {
 566                    let assist = &self.assists[&scroll_lock.assist_id];
 567                    if let Some(decorations) = assist.decorations.as_ref() {
 568                        let distance_from_top = editor.update(cx, |editor, cx| {
 569                            let scroll_top = editor.scroll_position(cx).y;
 570                            let prompt_row = editor
 571                                .row_for_block(decorations.prompt_block_id, cx)
 572                                .unwrap()
 573                                .0 as f32;
 574                            prompt_row - scroll_top
 575                        });
 576
 577                        if distance_from_top != scroll_lock.distance_from_top {
 578                            editor_assists.scroll_lock = None;
 579                        }
 580                    }
 581                }
 582            }
 583            EditorEvent::SelectionsChanged { .. } => {
 584                for assist_id in editor_assists.assist_ids.clone() {
 585                    let assist = &self.assists[&assist_id];
 586                    if let Some(decorations) = assist.decorations.as_ref() {
 587                        if decorations.prompt_editor.focus_handle(cx).is_focused(cx) {
 588                            return;
 589                        }
 590                    }
 591                }
 592
 593                editor_assists.scroll_lock = None;
 594            }
 595            _ => {}
 596        }
 597    }
 598
 599    fn finish_assist(&mut self, assist_id: InlineAssistId, undo: bool, cx: &mut WindowContext) {
 600        if let Some(assist) = self.assists.get(&assist_id) {
 601            let assist_group_id = assist.group_id;
 602            if self.assist_groups[&assist_group_id].linked {
 603                for assist_id in self.unlink_assist_group(assist_group_id, cx) {
 604                    self.finish_assist(assist_id, undo, cx);
 605                }
 606                return;
 607            }
 608        }
 609
 610        self.dismiss_assist(assist_id, cx);
 611
 612        if let Some(assist) = self.assists.remove(&assist_id) {
 613            if let hash_map::Entry::Occupied(mut entry) = self.assist_groups.entry(assist.group_id)
 614            {
 615                entry.get_mut().assist_ids.retain(|id| *id != assist_id);
 616                if entry.get().assist_ids.is_empty() {
 617                    entry.remove();
 618                }
 619            }
 620
 621            if let hash_map::Entry::Occupied(mut entry) =
 622                self.assists_by_editor.entry(assist.editor.clone())
 623            {
 624                entry.get_mut().assist_ids.retain(|id| *id != assist_id);
 625                if entry.get().assist_ids.is_empty() {
 626                    entry.remove();
 627                    if let Some(editor) = assist.editor.upgrade() {
 628                        self.update_editor_highlights(&editor, cx);
 629                    }
 630                } else {
 631                    entry.get().highlight_updates.send(()).ok();
 632                }
 633            }
 634
 635            if undo {
 636                assist.codegen.update(cx, |codegen, cx| codegen.undo(cx));
 637            }
 638        }
 639    }
 640
 641    fn dismiss_assist(&mut self, assist_id: InlineAssistId, cx: &mut WindowContext) -> bool {
 642        let Some(assist) = self.assists.get_mut(&assist_id) else {
 643            return false;
 644        };
 645        let Some(editor) = assist.editor.upgrade() else {
 646            return false;
 647        };
 648        let Some(decorations) = assist.decorations.take() else {
 649            return false;
 650        };
 651
 652        editor.update(cx, |editor, cx| {
 653            let mut to_remove = decorations.removed_line_block_ids;
 654            to_remove.insert(decorations.prompt_block_id);
 655            to_remove.insert(decorations.end_block_id);
 656            editor.remove_blocks(to_remove, None, cx);
 657        });
 658
 659        if decorations
 660            .prompt_editor
 661            .focus_handle(cx)
 662            .contains_focused(cx)
 663        {
 664            self.focus_next_assist(assist_id, cx);
 665        }
 666
 667        if let Some(editor_assists) = self.assists_by_editor.get_mut(&editor.downgrade()) {
 668            if editor_assists
 669                .scroll_lock
 670                .as_ref()
 671                .map_or(false, |lock| lock.assist_id == assist_id)
 672            {
 673                editor_assists.scroll_lock = None;
 674            }
 675            editor_assists.highlight_updates.send(()).ok();
 676        }
 677
 678        true
 679    }
 680
 681    fn focus_next_assist(&mut self, assist_id: InlineAssistId, cx: &mut WindowContext) {
 682        let Some(assist) = self.assists.get(&assist_id) else {
 683            return;
 684        };
 685
 686        let assist_group = &self.assist_groups[&assist.group_id];
 687        let assist_ix = assist_group
 688            .assist_ids
 689            .iter()
 690            .position(|id| *id == assist_id)
 691            .unwrap();
 692        let assist_ids = assist_group
 693            .assist_ids
 694            .iter()
 695            .skip(assist_ix + 1)
 696            .chain(assist_group.assist_ids.iter().take(assist_ix));
 697
 698        for assist_id in assist_ids {
 699            let assist = &self.assists[assist_id];
 700            if assist.decorations.is_some() {
 701                self.focus_assist(*assist_id, cx);
 702                return;
 703            }
 704        }
 705
 706        assist.editor.update(cx, |editor, cx| editor.focus(cx)).ok();
 707    }
 708
 709    fn focus_assist(&mut self, assist_id: InlineAssistId, cx: &mut WindowContext) {
 710        let assist = &self.assists[&assist_id];
 711        let Some(editor) = assist.editor.upgrade() else {
 712            return;
 713        };
 714
 715        if let Some(decorations) = assist.decorations.as_ref() {
 716            decorations.prompt_editor.update(cx, |prompt_editor, cx| {
 717                prompt_editor.editor.update(cx, |editor, cx| {
 718                    editor.focus(cx);
 719                    editor.select_all(&SelectAll, cx);
 720                })
 721            });
 722        }
 723
 724        let position = assist.codegen.read(cx).range.start;
 725        editor.update(cx, |editor, cx| {
 726            editor.change_selections(None, cx, |selections| {
 727                selections.select_anchor_ranges([position..position])
 728            });
 729
 730            let mut scroll_target_top;
 731            let mut scroll_target_bottom;
 732            if let Some(decorations) = assist.decorations.as_ref() {
 733                scroll_target_top = editor
 734                    .row_for_block(decorations.prompt_block_id, cx)
 735                    .unwrap()
 736                    .0 as f32;
 737                scroll_target_bottom = editor
 738                    .row_for_block(decorations.end_block_id, cx)
 739                    .unwrap()
 740                    .0 as f32;
 741            } else {
 742                let snapshot = editor.snapshot(cx);
 743                let codegen = assist.codegen.read(cx);
 744                let start_row = codegen
 745                    .range
 746                    .start
 747                    .to_display_point(&snapshot.display_snapshot)
 748                    .row();
 749                scroll_target_top = start_row.0 as f32;
 750                scroll_target_bottom = scroll_target_top + 1.;
 751            }
 752            scroll_target_top -= editor.vertical_scroll_margin() as f32;
 753            scroll_target_bottom += editor.vertical_scroll_margin() as f32;
 754
 755            let height_in_lines = editor.visible_line_count().unwrap_or(0.);
 756            let scroll_top = editor.scroll_position(cx).y;
 757            let scroll_bottom = scroll_top + height_in_lines;
 758
 759            if scroll_target_top < scroll_top {
 760                editor.set_scroll_position(point(0., scroll_target_top), cx);
 761            } else if scroll_target_bottom > scroll_bottom {
 762                if (scroll_target_bottom - scroll_target_top) <= height_in_lines {
 763                    editor
 764                        .set_scroll_position(point(0., scroll_target_bottom - height_in_lines), cx);
 765                } else {
 766                    editor.set_scroll_position(point(0., scroll_target_top), cx);
 767                }
 768            }
 769        });
 770    }
 771
 772    fn resize_assist(
 773        &mut self,
 774        assist_id: InlineAssistId,
 775        height_in_lines: u8,
 776        cx: &mut WindowContext,
 777    ) {
 778        if let Some(assist) = self.assists.get_mut(&assist_id) {
 779            if let Some(editor) = assist.editor.upgrade() {
 780                if let Some(decorations) = assist.decorations.as_ref() {
 781                    let mut new_blocks = HashMap::default();
 782                    new_blocks.insert(
 783                        decorations.prompt_block_id,
 784                        (
 785                            Some(height_in_lines),
 786                            build_assist_editor_renderer(&decorations.prompt_editor),
 787                        ),
 788                    );
 789                    editor.update(cx, |editor, cx| {
 790                        editor
 791                            .display_map
 792                            .update(cx, |map, cx| map.replace_blocks(new_blocks, cx))
 793                    });
 794                }
 795            }
 796        }
 797    }
 798
 799    fn unlink_assist_group(
 800        &mut self,
 801        assist_group_id: InlineAssistGroupId,
 802        cx: &mut WindowContext,
 803    ) -> Vec<InlineAssistId> {
 804        let assist_group = self.assist_groups.get_mut(&assist_group_id).unwrap();
 805        assist_group.linked = false;
 806        for assist_id in &assist_group.assist_ids {
 807            let assist = self.assists.get_mut(assist_id).unwrap();
 808            if let Some(editor_decorations) = assist.decorations.as_ref() {
 809                editor_decorations
 810                    .prompt_editor
 811                    .update(cx, |prompt_editor, cx| prompt_editor.unlink(cx));
 812            }
 813        }
 814        assist_group.assist_ids.clone()
 815    }
 816
 817    pub fn start_assist(&mut self, assist_id: InlineAssistId, cx: &mut WindowContext) {
 818        let assist = if let Some(assist) = self.assists.get_mut(&assist_id) {
 819            assist
 820        } else {
 821            return;
 822        };
 823
 824        let assist_group_id = assist.group_id;
 825        if self.assist_groups[&assist_group_id].linked {
 826            for assist_id in self.unlink_assist_group(assist_group_id, cx) {
 827                self.start_assist(assist_id, cx);
 828            }
 829            return;
 830        }
 831
 832        let Some(user_prompt) = assist
 833            .decorations
 834            .as_ref()
 835            .map(|decorations| decorations.prompt_editor.read(cx).prompt(cx))
 836        else {
 837            return;
 838        };
 839
 840        self.prompt_history.retain(|prompt| *prompt != user_prompt);
 841        self.prompt_history.push_back(user_prompt.clone());
 842        if self.prompt_history.len() > PROMPT_HISTORY_MAX_LEN {
 843            self.prompt_history.pop_front();
 844        }
 845
 846        let codegen = assist.codegen.clone();
 847        let telemetry_id = CompletionProvider::global(cx).model().telemetry_id();
 848        let chunks: LocalBoxFuture<Result<BoxStream<Result<String>>>> =
 849            if user_prompt.trim().to_lowercase() == "delete" {
 850                async { Ok(stream::empty().boxed()) }.boxed_local()
 851            } else {
 852                let request = self.request_for_inline_assist(assist_id, cx);
 853                let mut cx = cx.to_async();
 854                async move {
 855                    let request = request.await?;
 856                    let chunks = cx
 857                        .update(|cx| CompletionProvider::global(cx).stream_completion(request, cx))?
 858                        .await?;
 859                    Ok(chunks.boxed())
 860                }
 861                .boxed_local()
 862            };
 863        codegen.update(cx, |codegen, cx| {
 864            codegen.start(telemetry_id, chunks, cx);
 865        });
 866    }
 867
 868    fn request_for_inline_assist(
 869        &self,
 870        assist_id: InlineAssistId,
 871        cx: &mut WindowContext,
 872    ) -> Task<Result<LanguageModelRequest>> {
 873        cx.spawn(|mut cx| async move {
 874            let (user_prompt, context_request, project_name, buffer, range, model) = cx
 875                .read_global(|this: &InlineAssistant, cx: &WindowContext| {
 876                    let assist = this.assists.get(&assist_id).context("invalid assist")?;
 877                    let decorations = assist.decorations.as_ref().context("invalid assist")?;
 878                    let editor = assist.editor.upgrade().context("invalid assist")?;
 879                    let user_prompt = decorations.prompt_editor.read(cx).prompt(cx);
 880                    let context_request = if assist.include_context {
 881                        assist.workspace.as_ref().and_then(|workspace| {
 882                            let workspace = workspace.upgrade()?.read(cx);
 883                            let assistant_panel = workspace.panel::<AssistantPanel>(cx)?;
 884                            Some(
 885                                assistant_panel
 886                                    .read(cx)
 887                                    .active_context(cx)?
 888                                    .read(cx)
 889                                    .to_completion_request(cx),
 890                            )
 891                        })
 892                    } else {
 893                        None
 894                    };
 895                    let project_name = assist.workspace.as_ref().and_then(|workspace| {
 896                        let workspace = workspace.upgrade()?;
 897                        Some(
 898                            workspace
 899                                .read(cx)
 900                                .project()
 901                                .read(cx)
 902                                .worktree_root_names(cx)
 903                                .collect::<Vec<&str>>()
 904                                .join("/"),
 905                        )
 906                    });
 907                    let buffer = editor.read(cx).buffer().read(cx).snapshot(cx);
 908                    let range = assist.codegen.read(cx).range.clone();
 909                    let model = CompletionProvider::global(cx).model();
 910                    anyhow::Ok((
 911                        user_prompt,
 912                        context_request,
 913                        project_name,
 914                        buffer,
 915                        range,
 916                        model,
 917                    ))
 918                })??;
 919
 920            let language = buffer.language_at(range.start);
 921            let language_name = if let Some(language) = language.as_ref() {
 922                if Arc::ptr_eq(language, &language::PLAIN_TEXT) {
 923                    None
 924                } else {
 925                    Some(language.name())
 926                }
 927            } else {
 928                None
 929            };
 930
 931            // Higher Temperature increases the randomness of model outputs.
 932            // If Markdown or No Language is Known, increase the randomness for more creative output
 933            // If Code, decrease temperature to get more deterministic outputs
 934            let temperature = if let Some(language) = language_name.clone() {
 935                if language.as_ref() == "Markdown" {
 936                    1.0
 937                } else {
 938                    0.5
 939                }
 940            } else {
 941                1.0
 942            };
 943
 944            let prompt = cx
 945                .background_executor()
 946                .spawn(async move {
 947                    let language_name = language_name.as_deref();
 948                    let start = buffer.point_to_buffer_offset(range.start);
 949                    let end = buffer.point_to_buffer_offset(range.end);
 950                    let (buffer, range) = if let Some((start, end)) = start.zip(end) {
 951                        let (start_buffer, start_buffer_offset) = start;
 952                        let (end_buffer, end_buffer_offset) = end;
 953                        if start_buffer.remote_id() == end_buffer.remote_id() {
 954                            (start_buffer.clone(), start_buffer_offset..end_buffer_offset)
 955                        } else {
 956                            return Err(anyhow!("invalid transformation range"));
 957                        }
 958                    } else {
 959                        return Err(anyhow!("invalid transformation range"));
 960                    };
 961                    generate_content_prompt(user_prompt, language_name, buffer, range, project_name)
 962                })
 963                .await?;
 964
 965            let mut messages = Vec::new();
 966            if let Some(context_request) = context_request {
 967                messages = context_request.messages;
 968            }
 969
 970            messages.push(LanguageModelRequestMessage {
 971                role: Role::User,
 972                content: prompt,
 973            });
 974
 975            Ok(LanguageModelRequest {
 976                model,
 977                messages,
 978                stop: vec!["|END|>".to_string()],
 979                temperature,
 980            })
 981        })
 982    }
 983
 984    pub fn stop_assist(&mut self, assist_id: InlineAssistId, cx: &mut WindowContext) {
 985        let assist = if let Some(assist) = self.assists.get_mut(&assist_id) {
 986            assist
 987        } else {
 988            return;
 989        };
 990
 991        assist.codegen.update(cx, |codegen, cx| codegen.stop(cx));
 992    }
 993
 994    fn update_editor_highlights(&self, editor: &View<Editor>, cx: &mut WindowContext) {
 995        let mut gutter_pending_ranges = Vec::new();
 996        let mut gutter_transformed_ranges = Vec::new();
 997        let mut foreground_ranges = Vec::new();
 998        let mut inserted_row_ranges = Vec::new();
 999        let empty_assist_ids = Vec::new();
1000        let assist_ids = self
1001            .assists_by_editor
1002            .get(&editor.downgrade())
1003            .map_or(&empty_assist_ids, |editor_assists| {
1004                &editor_assists.assist_ids
1005            });
1006
1007        for assist_id in assist_ids {
1008            if let Some(assist) = self.assists.get(assist_id) {
1009                let codegen = assist.codegen.read(cx);
1010                foreground_ranges.extend(codegen.last_equal_ranges().iter().cloned());
1011
1012                if codegen.edit_position != codegen.range.end {
1013                    gutter_pending_ranges.push(codegen.edit_position..codegen.range.end);
1014                }
1015
1016                if codegen.range.start != codegen.edit_position {
1017                    gutter_transformed_ranges.push(codegen.range.start..codegen.edit_position);
1018                }
1019
1020                if assist.decorations.is_some() {
1021                    inserted_row_ranges.extend(codegen.diff.inserted_row_ranges.iter().cloned());
1022                }
1023            }
1024        }
1025
1026        let snapshot = editor.read(cx).buffer().read(cx).snapshot(cx);
1027        merge_ranges(&mut foreground_ranges, &snapshot);
1028        merge_ranges(&mut gutter_pending_ranges, &snapshot);
1029        merge_ranges(&mut gutter_transformed_ranges, &snapshot);
1030        editor.update(cx, |editor, cx| {
1031            enum GutterPendingRange {}
1032            if gutter_pending_ranges.is_empty() {
1033                editor.clear_gutter_highlights::<GutterPendingRange>(cx);
1034            } else {
1035                editor.highlight_gutter::<GutterPendingRange>(
1036                    &gutter_pending_ranges,
1037                    |cx| cx.theme().status().info_background,
1038                    cx,
1039                )
1040            }
1041
1042            enum GutterTransformedRange {}
1043            if gutter_transformed_ranges.is_empty() {
1044                editor.clear_gutter_highlights::<GutterTransformedRange>(cx);
1045            } else {
1046                editor.highlight_gutter::<GutterTransformedRange>(
1047                    &gutter_transformed_ranges,
1048                    |cx| cx.theme().status().info,
1049                    cx,
1050                )
1051            }
1052
1053            if foreground_ranges.is_empty() {
1054                editor.clear_highlights::<InlineAssist>(cx);
1055            } else {
1056                editor.highlight_text::<InlineAssist>(
1057                    foreground_ranges,
1058                    HighlightStyle {
1059                        fade_out: Some(0.6),
1060                        ..Default::default()
1061                    },
1062                    cx,
1063                );
1064            }
1065
1066            editor.clear_row_highlights::<InlineAssist>();
1067            for row_range in inserted_row_ranges {
1068                editor.highlight_rows::<InlineAssist>(
1069                    row_range,
1070                    Some(cx.theme().status().info_background),
1071                    false,
1072                    cx,
1073                );
1074            }
1075        });
1076    }
1077
1078    fn update_editor_blocks(
1079        &mut self,
1080        editor: &View<Editor>,
1081        assist_id: InlineAssistId,
1082        cx: &mut WindowContext,
1083    ) {
1084        let Some(assist) = self.assists.get_mut(&assist_id) else {
1085            return;
1086        };
1087        let Some(decorations) = assist.decorations.as_mut() else {
1088            return;
1089        };
1090
1091        let codegen = assist.codegen.read(cx);
1092        let old_snapshot = codegen.snapshot.clone();
1093        let old_buffer = codegen.old_buffer.clone();
1094        let deleted_row_ranges = codegen.diff.deleted_row_ranges.clone();
1095
1096        editor.update(cx, |editor, cx| {
1097            let old_blocks = mem::take(&mut decorations.removed_line_block_ids);
1098            editor.remove_blocks(old_blocks, None, cx);
1099
1100            let mut new_blocks = Vec::new();
1101            for (new_row, old_row_range) in deleted_row_ranges {
1102                let (_, buffer_start) = old_snapshot
1103                    .point_to_buffer_offset(Point::new(*old_row_range.start(), 0))
1104                    .unwrap();
1105                let (_, buffer_end) = old_snapshot
1106                    .point_to_buffer_offset(Point::new(
1107                        *old_row_range.end(),
1108                        old_snapshot.line_len(MultiBufferRow(*old_row_range.end())),
1109                    ))
1110                    .unwrap();
1111
1112                let deleted_lines_editor = cx.new_view(|cx| {
1113                    let multi_buffer = cx.new_model(|_| {
1114                        MultiBuffer::without_headers(0, language::Capability::ReadOnly)
1115                    });
1116                    multi_buffer.update(cx, |multi_buffer, cx| {
1117                        multi_buffer.push_excerpts(
1118                            old_buffer.clone(),
1119                            Some(ExcerptRange {
1120                                context: buffer_start..buffer_end,
1121                                primary: None,
1122                            }),
1123                            cx,
1124                        );
1125                    });
1126
1127                    enum DeletedLines {}
1128                    let mut editor = Editor::for_multibuffer(multi_buffer, None, true, cx);
1129                    editor.set_soft_wrap_mode(language::language_settings::SoftWrap::None, cx);
1130                    editor.set_show_wrap_guides(false, cx);
1131                    editor.set_show_gutter(false, cx);
1132                    editor.scroll_manager.set_forbid_vertical_scroll(true);
1133                    editor.set_read_only(true);
1134                    editor.highlight_rows::<DeletedLines>(
1135                        Anchor::min()..=Anchor::max(),
1136                        Some(cx.theme().status().deleted_background),
1137                        false,
1138                        cx,
1139                    );
1140                    editor
1141                });
1142
1143                let height = deleted_lines_editor
1144                    .update(cx, |editor, cx| editor.max_point(cx).row().0 as u8 + 1);
1145                new_blocks.push(BlockProperties {
1146                    position: new_row,
1147                    height,
1148                    style: BlockStyle::Flex,
1149                    render: Box::new(move |cx| {
1150                        div()
1151                            .bg(cx.theme().status().deleted_background)
1152                            .size_full()
1153                            .pl(cx.gutter_dimensions.full_width())
1154                            .child(deleted_lines_editor.clone())
1155                            .into_any_element()
1156                    }),
1157                    disposition: BlockDisposition::Above,
1158                });
1159            }
1160
1161            decorations.removed_line_block_ids = editor
1162                .insert_blocks(new_blocks, None, cx)
1163                .into_iter()
1164                .collect();
1165        })
1166    }
1167}
1168
1169struct EditorInlineAssists {
1170    assist_ids: Vec<InlineAssistId>,
1171    scroll_lock: Option<InlineAssistScrollLock>,
1172    highlight_updates: async_watch::Sender<()>,
1173    _update_highlights: Task<Result<()>>,
1174    _subscriptions: Vec<gpui::Subscription>,
1175}
1176
1177struct InlineAssistScrollLock {
1178    assist_id: InlineAssistId,
1179    distance_from_top: f32,
1180}
1181
1182impl EditorInlineAssists {
1183    #[allow(clippy::too_many_arguments)]
1184    fn new(editor: &View<Editor>, cx: &mut WindowContext) -> Self {
1185        let (highlight_updates_tx, mut highlight_updates_rx) = async_watch::channel(());
1186        Self {
1187            assist_ids: Vec::new(),
1188            scroll_lock: None,
1189            highlight_updates: highlight_updates_tx,
1190            _update_highlights: cx.spawn(|mut cx| {
1191                let editor = editor.downgrade();
1192                async move {
1193                    while let Ok(()) = highlight_updates_rx.changed().await {
1194                        let editor = editor.upgrade().context("editor was dropped")?;
1195                        cx.update_global(|assistant: &mut InlineAssistant, cx| {
1196                            assistant.update_editor_highlights(&editor, cx);
1197                        })?;
1198                    }
1199                    Ok(())
1200                }
1201            }),
1202            _subscriptions: vec![
1203                cx.observe_release(editor, {
1204                    let editor = editor.downgrade();
1205                    |_, cx| {
1206                        InlineAssistant::update_global(cx, |this, cx| {
1207                            this.handle_editor_release(editor, cx);
1208                        })
1209                    }
1210                }),
1211                cx.observe(editor, move |editor, cx| {
1212                    InlineAssistant::update_global(cx, |this, cx| {
1213                        this.handle_editor_change(editor, cx)
1214                    })
1215                }),
1216                cx.subscribe(editor, move |editor, event, cx| {
1217                    InlineAssistant::update_global(cx, |this, cx| {
1218                        this.handle_editor_event(editor, event, cx)
1219                    })
1220                }),
1221                editor.update(cx, |editor, cx| {
1222                    let editor_handle = cx.view().downgrade();
1223                    editor.register_action(
1224                        move |_: &editor::actions::Newline, cx: &mut WindowContext| {
1225                            InlineAssistant::update_global(cx, |this, cx| {
1226                                if let Some(editor) = editor_handle.upgrade() {
1227                                    this.handle_editor_newline(editor, cx)
1228                                }
1229                            })
1230                        },
1231                    )
1232                }),
1233                editor.update(cx, |editor, cx| {
1234                    let editor_handle = cx.view().downgrade();
1235                    editor.register_action(
1236                        move |_: &editor::actions::Cancel, cx: &mut WindowContext| {
1237                            InlineAssistant::update_global(cx, |this, cx| {
1238                                if let Some(editor) = editor_handle.upgrade() {
1239                                    this.handle_editor_cancel(editor, cx)
1240                                }
1241                            })
1242                        },
1243                    )
1244                }),
1245            ],
1246        }
1247    }
1248}
1249
1250struct InlineAssistGroup {
1251    assist_ids: Vec<InlineAssistId>,
1252    linked: bool,
1253    active_assist_id: Option<InlineAssistId>,
1254}
1255
1256impl InlineAssistGroup {
1257    fn new() -> Self {
1258        Self {
1259            assist_ids: Vec::new(),
1260            linked: true,
1261            active_assist_id: None,
1262        }
1263    }
1264}
1265
1266fn build_assist_editor_renderer(editor: &View<PromptEditor>) -> RenderBlock {
1267    let editor = editor.clone();
1268    Box::new(move |cx: &mut BlockContext| {
1269        *editor.read(cx).gutter_dimensions.lock() = *cx.gutter_dimensions;
1270        editor.clone().into_any_element()
1271    })
1272}
1273
1274#[derive(Copy, Clone, Default, Debug, PartialEq, Eq, Hash)]
1275pub struct InlineAssistId(usize);
1276
1277impl InlineAssistId {
1278    fn post_inc(&mut self) -> InlineAssistId {
1279        let id = *self;
1280        self.0 += 1;
1281        id
1282    }
1283}
1284
1285#[derive(Copy, Clone, Default, Debug, PartialEq, Eq, Hash)]
1286struct InlineAssistGroupId(usize);
1287
1288impl InlineAssistGroupId {
1289    fn post_inc(&mut self) -> InlineAssistGroupId {
1290        let id = *self;
1291        self.0 += 1;
1292        id
1293    }
1294}
1295
1296enum PromptEditorEvent {
1297    StartRequested,
1298    StopRequested,
1299    ConfirmRequested,
1300    CancelRequested,
1301    DismissRequested,
1302    Resized { height_in_lines: u8 },
1303}
1304
1305struct PromptEditor {
1306    id: InlineAssistId,
1307    fs: Arc<dyn Fs>,
1308    height_in_lines: u8,
1309    editor: View<Editor>,
1310    edited_since_done: bool,
1311    gutter_dimensions: Arc<Mutex<GutterDimensions>>,
1312    prompt_history: VecDeque<String>,
1313    prompt_history_ix: Option<usize>,
1314    pending_prompt: String,
1315    codegen: Model<Codegen>,
1316    _codegen_subscription: Subscription,
1317    editor_subscriptions: Vec<Subscription>,
1318    pending_token_count: Task<Result<()>>,
1319    token_count: Option<usize>,
1320    _token_count_subscriptions: Vec<Subscription>,
1321    workspace: Option<WeakView<Workspace>>,
1322}
1323
1324impl EventEmitter<PromptEditorEvent> for PromptEditor {}
1325
1326impl Render for PromptEditor {
1327    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
1328        let gutter_dimensions = *self.gutter_dimensions.lock();
1329        let fs = self.fs.clone();
1330
1331        let buttons = match &self.codegen.read(cx).status {
1332            CodegenStatus::Idle => {
1333                vec![
1334                    IconButton::new("cancel", IconName::Close)
1335                        .icon_color(Color::Muted)
1336                        .size(ButtonSize::None)
1337                        .tooltip(|cx| Tooltip::for_action("Cancel Assist", &menu::Cancel, cx))
1338                        .on_click(
1339                            cx.listener(|_, _, cx| cx.emit(PromptEditorEvent::CancelRequested)),
1340                        ),
1341                    IconButton::new("start", IconName::Sparkle)
1342                        .icon_color(Color::Muted)
1343                        .size(ButtonSize::None)
1344                        .icon_size(IconSize::XSmall)
1345                        .tooltip(|cx| Tooltip::for_action("Transform", &menu::Confirm, cx))
1346                        .on_click(
1347                            cx.listener(|_, _, cx| cx.emit(PromptEditorEvent::StartRequested)),
1348                        ),
1349                ]
1350            }
1351            CodegenStatus::Pending => {
1352                vec![
1353                    IconButton::new("cancel", IconName::Close)
1354                        .icon_color(Color::Muted)
1355                        .size(ButtonSize::None)
1356                        .tooltip(|cx| Tooltip::text("Cancel Assist", cx))
1357                        .on_click(
1358                            cx.listener(|_, _, cx| cx.emit(PromptEditorEvent::CancelRequested)),
1359                        ),
1360                    IconButton::new("stop", IconName::Stop)
1361                        .icon_color(Color::Error)
1362                        .size(ButtonSize::None)
1363                        .icon_size(IconSize::XSmall)
1364                        .tooltip(|cx| {
1365                            Tooltip::with_meta(
1366                                "Interrupt Transformation",
1367                                Some(&menu::Cancel),
1368                                "Changes won't be discarded",
1369                                cx,
1370                            )
1371                        })
1372                        .on_click(
1373                            cx.listener(|_, _, cx| cx.emit(PromptEditorEvent::StopRequested)),
1374                        ),
1375                ]
1376            }
1377            CodegenStatus::Error(_) | CodegenStatus::Done => {
1378                vec![
1379                    IconButton::new("cancel", IconName::Close)
1380                        .icon_color(Color::Muted)
1381                        .size(ButtonSize::None)
1382                        .tooltip(|cx| Tooltip::for_action("Cancel Assist", &menu::Cancel, cx))
1383                        .on_click(
1384                            cx.listener(|_, _, cx| cx.emit(PromptEditorEvent::CancelRequested)),
1385                        ),
1386                    if self.edited_since_done {
1387                        IconButton::new("restart", IconName::RotateCw)
1388                            .icon_color(Color::Info)
1389                            .icon_size(IconSize::XSmall)
1390                            .size(ButtonSize::None)
1391                            .tooltip(|cx| {
1392                                Tooltip::with_meta(
1393                                    "Restart Transformation",
1394                                    Some(&menu::Confirm),
1395                                    "Changes will be discarded",
1396                                    cx,
1397                                )
1398                            })
1399                            .on_click(cx.listener(|_, _, cx| {
1400                                cx.emit(PromptEditorEvent::StartRequested);
1401                            }))
1402                    } else {
1403                        IconButton::new("confirm", IconName::Check)
1404                            .icon_color(Color::Info)
1405                            .size(ButtonSize::None)
1406                            .tooltip(|cx| Tooltip::for_action("Confirm Assist", &menu::Confirm, cx))
1407                            .on_click(cx.listener(|_, _, cx| {
1408                                cx.emit(PromptEditorEvent::ConfirmRequested);
1409                            }))
1410                    },
1411                ]
1412            }
1413        };
1414
1415        h_flex()
1416            .bg(cx.theme().colors().editor_background)
1417            .border_y_1()
1418            .border_color(cx.theme().status().info_border)
1419            .py_1p5()
1420            .h_full()
1421            .w_full()
1422            .on_action(cx.listener(Self::confirm))
1423            .on_action(cx.listener(Self::cancel))
1424            .on_action(cx.listener(Self::move_up))
1425            .on_action(cx.listener(Self::move_down))
1426            .child(
1427                h_flex()
1428                    .w(gutter_dimensions.full_width() + (gutter_dimensions.margin / 2.0))
1429                    .justify_center()
1430                    .gap_2()
1431                    .child(
1432                        PopoverMenu::new("model-switcher")
1433                            .menu(move |cx| {
1434                                ContextMenu::build(cx, |mut menu, cx| {
1435                                    for model in CompletionProvider::global(cx).available_models(cx)
1436                                    {
1437                                        menu = menu.custom_entry(
1438                                            {
1439                                                let model = model.clone();
1440                                                move |_| {
1441                                                    Label::new(model.display_name())
1442                                                        .into_any_element()
1443                                                }
1444                                            },
1445                                            {
1446                                                let fs = fs.clone();
1447                                                let model = model.clone();
1448                                                move |cx| {
1449                                                    let model = model.clone();
1450                                                    update_settings_file::<AssistantSettings>(
1451                                                        fs.clone(),
1452                                                        cx,
1453                                                        move |settings| settings.set_model(model),
1454                                                    );
1455                                                }
1456                                            },
1457                                        );
1458                                    }
1459                                    menu
1460                                })
1461                                .into()
1462                            })
1463                            .trigger(
1464                                IconButton::new("context", IconName::Settings)
1465                                    .size(ButtonSize::None)
1466                                    .icon_size(IconSize::Small)
1467                                    .icon_color(Color::Muted)
1468                                    .tooltip(move |cx| {
1469                                        Tooltip::with_meta(
1470                                            format!(
1471                                                "Using {}",
1472                                                CompletionProvider::global(cx)
1473                                                    .model()
1474                                                    .display_name()
1475                                            ),
1476                                            None,
1477                                            "Click to Change Model",
1478                                            cx,
1479                                        )
1480                                    }),
1481                            )
1482                            .anchor(gpui::AnchorCorner::BottomRight),
1483                    )
1484                    .children(
1485                        if let CodegenStatus::Error(error) = &self.codegen.read(cx).status {
1486                            let error_message = SharedString::from(error.to_string());
1487                            Some(
1488                                div()
1489                                    .id("error")
1490                                    .tooltip(move |cx| Tooltip::text(error_message.clone(), cx))
1491                                    .child(
1492                                        Icon::new(IconName::XCircle)
1493                                            .size(IconSize::Small)
1494                                            .color(Color::Error),
1495                                    ),
1496                            )
1497                        } else {
1498                            None
1499                        },
1500                    ),
1501            )
1502            .child(div().flex_1().child(self.render_prompt_editor(cx)))
1503            .child(
1504                h_flex()
1505                    .gap_2()
1506                    .pr_4()
1507                    .children(self.render_token_count(cx))
1508                    .children(buttons),
1509            )
1510    }
1511}
1512
1513impl FocusableView for PromptEditor {
1514    fn focus_handle(&self, cx: &AppContext) -> FocusHandle {
1515        self.editor.focus_handle(cx)
1516    }
1517}
1518
1519impl PromptEditor {
1520    const MAX_LINES: u8 = 8;
1521
1522    #[allow(clippy::too_many_arguments)]
1523    fn new(
1524        id: InlineAssistId,
1525        gutter_dimensions: Arc<Mutex<GutterDimensions>>,
1526        prompt_history: VecDeque<String>,
1527        prompt_buffer: Model<MultiBuffer>,
1528        codegen: Model<Codegen>,
1529        parent_editor: &View<Editor>,
1530        assistant_panel: Option<&View<AssistantPanel>>,
1531        workspace: Option<WeakView<Workspace>>,
1532        fs: Arc<dyn Fs>,
1533        cx: &mut ViewContext<Self>,
1534    ) -> Self {
1535        let prompt_editor = cx.new_view(|cx| {
1536            let mut editor = Editor::new(
1537                EditorMode::AutoHeight {
1538                    max_lines: Self::MAX_LINES as usize,
1539                },
1540                prompt_buffer,
1541                None,
1542                false,
1543                cx,
1544            );
1545            editor.set_soft_wrap_mode(language::language_settings::SoftWrap::EditorWidth, cx);
1546            // Since the prompt editors for all inline assistants are linked,
1547            // always show the cursor (even when it isn't focused) because
1548            // typing in one will make what you typed appear in all of them.
1549            editor.set_show_cursor_when_unfocused(true, cx);
1550            editor.set_placeholder_text("Add a prompt…", cx);
1551            editor
1552        });
1553
1554        let mut token_count_subscriptions = Vec::new();
1555        token_count_subscriptions
1556            .push(cx.subscribe(parent_editor, Self::handle_parent_editor_event));
1557        if let Some(assistant_panel) = assistant_panel {
1558            token_count_subscriptions
1559                .push(cx.subscribe(assistant_panel, Self::handle_assistant_panel_event));
1560        }
1561
1562        let mut this = Self {
1563            id,
1564            height_in_lines: 1,
1565            editor: prompt_editor,
1566            edited_since_done: false,
1567            gutter_dimensions,
1568            prompt_history,
1569            prompt_history_ix: None,
1570            pending_prompt: String::new(),
1571            _codegen_subscription: cx.observe(&codegen, Self::handle_codegen_changed),
1572            editor_subscriptions: Vec::new(),
1573            codegen,
1574            fs,
1575            pending_token_count: Task::ready(Ok(())),
1576            token_count: None,
1577            _token_count_subscriptions: token_count_subscriptions,
1578            workspace,
1579        };
1580        this.count_lines(cx);
1581        this.count_tokens(cx);
1582        this.subscribe_to_editor(cx);
1583        this
1584    }
1585
1586    fn subscribe_to_editor(&mut self, cx: &mut ViewContext<Self>) {
1587        self.editor_subscriptions.clear();
1588        self.editor_subscriptions
1589            .push(cx.observe(&self.editor, Self::handle_prompt_editor_changed));
1590        self.editor_subscriptions
1591            .push(cx.subscribe(&self.editor, Self::handle_prompt_editor_events));
1592    }
1593
1594    fn set_show_cursor_when_unfocused(
1595        &mut self,
1596        show_cursor_when_unfocused: bool,
1597        cx: &mut ViewContext<Self>,
1598    ) {
1599        self.editor.update(cx, |editor, cx| {
1600            editor.set_show_cursor_when_unfocused(show_cursor_when_unfocused, cx)
1601        });
1602    }
1603
1604    fn unlink(&mut self, cx: &mut ViewContext<Self>) {
1605        let prompt = self.prompt(cx);
1606        let focus = self.editor.focus_handle(cx).contains_focused(cx);
1607        self.editor = cx.new_view(|cx| {
1608            let mut editor = Editor::auto_height(Self::MAX_LINES as usize, cx);
1609            editor.set_soft_wrap_mode(language::language_settings::SoftWrap::EditorWidth, cx);
1610            editor.set_placeholder_text("Add a prompt…", cx);
1611            editor.set_text(prompt, cx);
1612            if focus {
1613                editor.focus(cx);
1614            }
1615            editor
1616        });
1617        self.subscribe_to_editor(cx);
1618    }
1619
1620    fn prompt(&self, cx: &AppContext) -> String {
1621        self.editor.read(cx).text(cx)
1622    }
1623
1624    fn count_lines(&mut self, cx: &mut ViewContext<Self>) {
1625        let height_in_lines = cmp::max(
1626            2, // Make the editor at least two lines tall, to account for padding and buttons.
1627            cmp::min(
1628                self.editor
1629                    .update(cx, |editor, cx| editor.max_point(cx).row().0 + 1),
1630                Self::MAX_LINES as u32,
1631            ),
1632        ) as u8;
1633
1634        if height_in_lines != self.height_in_lines {
1635            self.height_in_lines = height_in_lines;
1636            cx.emit(PromptEditorEvent::Resized { height_in_lines });
1637        }
1638    }
1639
1640    fn handle_parent_editor_event(
1641        &mut self,
1642        _: View<Editor>,
1643        event: &EditorEvent,
1644        cx: &mut ViewContext<Self>,
1645    ) {
1646        if let EditorEvent::BufferEdited { .. } = event {
1647            self.count_tokens(cx);
1648        }
1649    }
1650
1651    fn handle_assistant_panel_event(
1652        &mut self,
1653        _: View<AssistantPanel>,
1654        event: &AssistantPanelEvent,
1655        cx: &mut ViewContext<Self>,
1656    ) {
1657        let AssistantPanelEvent::ContextEdited { .. } = event;
1658        self.count_tokens(cx);
1659    }
1660
1661    fn count_tokens(&mut self, cx: &mut ViewContext<Self>) {
1662        let assist_id = self.id;
1663        self.pending_token_count = cx.spawn(|this, mut cx| async move {
1664            cx.background_executor().timer(Duration::from_secs(1)).await;
1665            let request = cx
1666                .update_global(|inline_assistant: &mut InlineAssistant, cx| {
1667                    inline_assistant.request_for_inline_assist(assist_id, cx)
1668                })?
1669                .await?;
1670
1671            let token_count = cx
1672                .update(|cx| CompletionProvider::global(cx).count_tokens(request, cx))?
1673                .await?;
1674            this.update(&mut cx, |this, cx| {
1675                this.token_count = Some(token_count);
1676                cx.notify();
1677            })
1678        })
1679    }
1680
1681    fn handle_prompt_editor_changed(&mut self, _: View<Editor>, cx: &mut ViewContext<Self>) {
1682        self.count_lines(cx);
1683    }
1684
1685    fn handle_prompt_editor_events(
1686        &mut self,
1687        _: View<Editor>,
1688        event: &EditorEvent,
1689        cx: &mut ViewContext<Self>,
1690    ) {
1691        match event {
1692            EditorEvent::Edited { .. } => {
1693                let prompt = self.editor.read(cx).text(cx);
1694                if self
1695                    .prompt_history_ix
1696                    .map_or(true, |ix| self.prompt_history[ix] != prompt)
1697                {
1698                    self.prompt_history_ix.take();
1699                    self.pending_prompt = prompt;
1700                }
1701
1702                self.edited_since_done = true;
1703                cx.notify();
1704            }
1705            EditorEvent::BufferEdited => {
1706                self.count_tokens(cx);
1707            }
1708            _ => {}
1709        }
1710    }
1711
1712    fn handle_codegen_changed(&mut self, _: Model<Codegen>, cx: &mut ViewContext<Self>) {
1713        match &self.codegen.read(cx).status {
1714            CodegenStatus::Idle => {
1715                self.editor
1716                    .update(cx, |editor, _| editor.set_read_only(false));
1717            }
1718            CodegenStatus::Pending => {
1719                self.editor
1720                    .update(cx, |editor, _| editor.set_read_only(true));
1721            }
1722            CodegenStatus::Done | CodegenStatus::Error(_) => {
1723                self.edited_since_done = false;
1724                self.editor
1725                    .update(cx, |editor, _| editor.set_read_only(false));
1726            }
1727        }
1728    }
1729
1730    fn cancel(&mut self, _: &editor::actions::Cancel, cx: &mut ViewContext<Self>) {
1731        match &self.codegen.read(cx).status {
1732            CodegenStatus::Idle | CodegenStatus::Done | CodegenStatus::Error(_) => {
1733                cx.emit(PromptEditorEvent::CancelRequested);
1734            }
1735            CodegenStatus::Pending => {
1736                cx.emit(PromptEditorEvent::StopRequested);
1737            }
1738        }
1739    }
1740
1741    fn confirm(&mut self, _: &menu::Confirm, cx: &mut ViewContext<Self>) {
1742        match &self.codegen.read(cx).status {
1743            CodegenStatus::Idle => {
1744                cx.emit(PromptEditorEvent::StartRequested);
1745            }
1746            CodegenStatus::Pending => {
1747                cx.emit(PromptEditorEvent::DismissRequested);
1748            }
1749            CodegenStatus::Done | CodegenStatus::Error(_) => {
1750                if self.edited_since_done {
1751                    cx.emit(PromptEditorEvent::StartRequested);
1752                } else {
1753                    cx.emit(PromptEditorEvent::ConfirmRequested);
1754                }
1755            }
1756        }
1757    }
1758
1759    fn move_up(&mut self, _: &MoveUp, cx: &mut ViewContext<Self>) {
1760        if let Some(ix) = self.prompt_history_ix {
1761            if ix > 0 {
1762                self.prompt_history_ix = Some(ix - 1);
1763                let prompt = self.prompt_history[ix - 1].as_str();
1764                self.editor.update(cx, |editor, cx| {
1765                    editor.set_text(prompt, cx);
1766                    editor.move_to_beginning(&Default::default(), cx);
1767                });
1768            }
1769        } else if !self.prompt_history.is_empty() {
1770            self.prompt_history_ix = Some(self.prompt_history.len() - 1);
1771            let prompt = self.prompt_history[self.prompt_history.len() - 1].as_str();
1772            self.editor.update(cx, |editor, cx| {
1773                editor.set_text(prompt, cx);
1774                editor.move_to_beginning(&Default::default(), cx);
1775            });
1776        }
1777    }
1778
1779    fn move_down(&mut self, _: &MoveDown, cx: &mut ViewContext<Self>) {
1780        if let Some(ix) = self.prompt_history_ix {
1781            if ix < self.prompt_history.len() - 1 {
1782                self.prompt_history_ix = Some(ix + 1);
1783                let prompt = self.prompt_history[ix + 1].as_str();
1784                self.editor.update(cx, |editor, cx| {
1785                    editor.set_text(prompt, cx);
1786                    editor.move_to_end(&Default::default(), cx)
1787                });
1788            } else {
1789                self.prompt_history_ix = None;
1790                let prompt = self.pending_prompt.as_str();
1791                self.editor.update(cx, |editor, cx| {
1792                    editor.set_text(prompt, cx);
1793                    editor.move_to_end(&Default::default(), cx)
1794                });
1795            }
1796        }
1797    }
1798
1799    fn render_token_count(&self, cx: &mut ViewContext<Self>) -> Option<impl IntoElement> {
1800        let model = CompletionProvider::global(cx).model();
1801        let token_count = self.token_count?;
1802        let max_token_count = model.max_token_count();
1803
1804        let remaining_tokens = max_token_count as isize - token_count as isize;
1805        let token_count_color = if remaining_tokens <= 0 {
1806            Color::Error
1807        } else if token_count as f32 / max_token_count as f32 >= 0.8 {
1808            Color::Warning
1809        } else {
1810            Color::Muted
1811        };
1812
1813        let mut token_count = h_flex()
1814            .id("token_count")
1815            .gap_0p5()
1816            .child(
1817                Label::new(humanize_token_count(token_count))
1818                    .size(LabelSize::Small)
1819                    .color(token_count_color),
1820            )
1821            .child(Label::new("/").size(LabelSize::Small).color(Color::Muted))
1822            .child(
1823                Label::new(humanize_token_count(max_token_count))
1824                    .size(LabelSize::Small)
1825                    .color(Color::Muted),
1826            );
1827        if let Some(workspace) = self.workspace.clone() {
1828            token_count = token_count
1829                .tooltip(|cx| {
1830                    Tooltip::with_meta(
1831                        "Tokens Used by Inline Assistant",
1832                        None,
1833                        "Click to Open Assistant Panel",
1834                        cx,
1835                    )
1836                })
1837                .cursor_pointer()
1838                .on_mouse_down(gpui::MouseButton::Left, |_, cx| cx.stop_propagation())
1839                .on_click(move |_, cx| {
1840                    cx.stop_propagation();
1841                    workspace
1842                        .update(cx, |workspace, cx| {
1843                            workspace.focus_panel::<AssistantPanel>(cx)
1844                        })
1845                        .ok();
1846                });
1847        } else {
1848            token_count = token_count
1849                .cursor_default()
1850                .tooltip(|cx| Tooltip::text("Tokens Used by Inline Assistant", cx));
1851        }
1852
1853        Some(token_count)
1854    }
1855
1856    fn render_prompt_editor(&self, cx: &mut ViewContext<Self>) -> impl IntoElement {
1857        let settings = ThemeSettings::get_global(cx);
1858        let text_style = TextStyle {
1859            color: if self.editor.read(cx).read_only(cx) {
1860                cx.theme().colors().text_disabled
1861            } else {
1862                cx.theme().colors().text
1863            },
1864            font_family: settings.ui_font.family.clone(),
1865            font_features: settings.ui_font.features.clone(),
1866            font_size: rems(0.875).into(),
1867            font_weight: settings.ui_font.weight,
1868            font_style: FontStyle::Normal,
1869            line_height: relative(1.3),
1870            background_color: None,
1871            underline: None,
1872            strikethrough: None,
1873            white_space: WhiteSpace::Normal,
1874        };
1875        EditorElement::new(
1876            &self.editor,
1877            EditorStyle {
1878                background: cx.theme().colors().editor_background,
1879                local_player: cx.theme().players().local(),
1880                text: text_style,
1881                ..Default::default()
1882            },
1883        )
1884    }
1885}
1886
1887struct InlineAssist {
1888    group_id: InlineAssistGroupId,
1889    editor: WeakView<Editor>,
1890    decorations: Option<InlineAssistDecorations>,
1891    codegen: Model<Codegen>,
1892    _subscriptions: Vec<Subscription>,
1893    workspace: Option<WeakView<Workspace>>,
1894    include_context: bool,
1895}
1896
1897impl InlineAssist {
1898    #[allow(clippy::too_many_arguments)]
1899    fn new(
1900        assist_id: InlineAssistId,
1901        group_id: InlineAssistGroupId,
1902        include_context: bool,
1903        editor: &View<Editor>,
1904        prompt_editor: &View<PromptEditor>,
1905        prompt_block_id: CustomBlockId,
1906        end_block_id: CustomBlockId,
1907        codegen: Model<Codegen>,
1908        workspace: Option<WeakView<Workspace>>,
1909        cx: &mut WindowContext,
1910    ) -> Self {
1911        let prompt_editor_focus_handle = prompt_editor.focus_handle(cx);
1912        InlineAssist {
1913            group_id,
1914            include_context,
1915            editor: editor.downgrade(),
1916            decorations: Some(InlineAssistDecorations {
1917                prompt_block_id,
1918                prompt_editor: prompt_editor.clone(),
1919                removed_line_block_ids: HashSet::default(),
1920                end_block_id,
1921            }),
1922            codegen: codegen.clone(),
1923            workspace: workspace.clone(),
1924            _subscriptions: vec![
1925                cx.on_focus_in(&prompt_editor_focus_handle, move |cx| {
1926                    InlineAssistant::update_global(cx, |this, cx| {
1927                        this.handle_prompt_editor_focus_in(assist_id, cx)
1928                    })
1929                }),
1930                cx.on_focus_out(&prompt_editor_focus_handle, move |_, cx| {
1931                    InlineAssistant::update_global(cx, |this, cx| {
1932                        this.handle_prompt_editor_focus_out(assist_id, cx)
1933                    })
1934                }),
1935                cx.subscribe(prompt_editor, |prompt_editor, event, cx| {
1936                    InlineAssistant::update_global(cx, |this, cx| {
1937                        this.handle_prompt_editor_event(prompt_editor, event, cx)
1938                    })
1939                }),
1940                cx.observe(&codegen, {
1941                    let editor = editor.downgrade();
1942                    move |_, cx| {
1943                        if let Some(editor) = editor.upgrade() {
1944                            InlineAssistant::update_global(cx, |this, cx| {
1945                                if let Some(editor_assists) =
1946                                    this.assists_by_editor.get(&editor.downgrade())
1947                                {
1948                                    editor_assists.highlight_updates.send(()).ok();
1949                                }
1950
1951                                this.update_editor_blocks(&editor, assist_id, cx);
1952                            })
1953                        }
1954                    }
1955                }),
1956                cx.subscribe(&codegen, move |codegen, event, cx| {
1957                    InlineAssistant::update_global(cx, |this, cx| match event {
1958                        CodegenEvent::Undone => this.finish_assist(assist_id, false, cx),
1959                        CodegenEvent::Finished => {
1960                            let assist = if let Some(assist) = this.assists.get(&assist_id) {
1961                                assist
1962                            } else {
1963                                return;
1964                            };
1965
1966                            if let CodegenStatus::Error(error) = &codegen.read(cx).status {
1967                                if assist.decorations.is_none() {
1968                                    if let Some(workspace) = assist
1969                                        .workspace
1970                                        .as_ref()
1971                                        .and_then(|workspace| workspace.upgrade())
1972                                    {
1973                                        let error = format!("Inline assistant error: {}", error);
1974                                        workspace.update(cx, |workspace, cx| {
1975                                            struct InlineAssistantError;
1976
1977                                            let id =
1978                                                NotificationId::identified::<InlineAssistantError>(
1979                                                    assist_id.0,
1980                                                );
1981
1982                                            workspace.show_toast(Toast::new(id, error), cx);
1983                                        })
1984                                    }
1985                                }
1986                            }
1987
1988                            if assist.decorations.is_none() {
1989                                this.finish_assist(assist_id, false, cx);
1990                            }
1991                        }
1992                    })
1993                }),
1994            ],
1995        }
1996    }
1997}
1998
1999struct InlineAssistDecorations {
2000    prompt_block_id: CustomBlockId,
2001    prompt_editor: View<PromptEditor>,
2002    removed_line_block_ids: HashSet<CustomBlockId>,
2003    end_block_id: CustomBlockId,
2004}
2005
2006#[derive(Debug)]
2007pub enum CodegenEvent {
2008    Finished,
2009    Undone,
2010}
2011
2012pub struct Codegen {
2013    buffer: Model<MultiBuffer>,
2014    old_buffer: Model<Buffer>,
2015    snapshot: MultiBufferSnapshot,
2016    range: Range<Anchor>,
2017    edit_position: Anchor,
2018    last_equal_ranges: Vec<Range<Anchor>>,
2019    prepend_transaction_id: Option<TransactionId>,
2020    generation_transaction_id: Option<TransactionId>,
2021    status: CodegenStatus,
2022    generation: Task<()>,
2023    diff: Diff,
2024    telemetry: Option<Arc<Telemetry>>,
2025    _subscription: gpui::Subscription,
2026}
2027
2028enum CodegenStatus {
2029    Idle,
2030    Pending,
2031    Done,
2032    Error(anyhow::Error),
2033}
2034
2035#[derive(Default)]
2036struct Diff {
2037    task: Option<Task<()>>,
2038    should_update: bool,
2039    deleted_row_ranges: Vec<(Anchor, RangeInclusive<u32>)>,
2040    inserted_row_ranges: Vec<RangeInclusive<Anchor>>,
2041}
2042
2043impl EventEmitter<CodegenEvent> for Codegen {}
2044
2045impl Codegen {
2046    pub fn new(
2047        buffer: Model<MultiBuffer>,
2048        range: Range<Anchor>,
2049        prepend_transaction_id: Option<TransactionId>,
2050        telemetry: Option<Arc<Telemetry>>,
2051        cx: &mut ModelContext<Self>,
2052    ) -> Self {
2053        let snapshot = buffer.read(cx).snapshot(cx);
2054
2055        let (old_buffer, _, _) = buffer
2056            .read(cx)
2057            .range_to_buffer_ranges(range.clone(), cx)
2058            .pop()
2059            .unwrap();
2060        let old_buffer = cx.new_model(|cx| {
2061            let old_buffer = old_buffer.read(cx);
2062            let text = old_buffer.as_rope().clone();
2063            let line_ending = old_buffer.line_ending();
2064            let language = old_buffer.language().cloned();
2065            let language_registry = old_buffer.language_registry();
2066
2067            let mut buffer = Buffer::local_normalized(text, line_ending, cx);
2068            buffer.set_language(language, cx);
2069            if let Some(language_registry) = language_registry {
2070                buffer.set_language_registry(language_registry)
2071            }
2072            buffer
2073        });
2074
2075        Self {
2076            buffer: buffer.clone(),
2077            old_buffer,
2078            edit_position: range.start,
2079            range,
2080            snapshot,
2081            last_equal_ranges: Default::default(),
2082            prepend_transaction_id,
2083            generation_transaction_id: None,
2084            status: CodegenStatus::Idle,
2085            generation: Task::ready(()),
2086            diff: Diff::default(),
2087            telemetry,
2088            _subscription: cx.subscribe(&buffer, Self::handle_buffer_event),
2089        }
2090    }
2091
2092    fn handle_buffer_event(
2093        &mut self,
2094        _buffer: Model<MultiBuffer>,
2095        event: &multi_buffer::Event,
2096        cx: &mut ModelContext<Self>,
2097    ) {
2098        if let multi_buffer::Event::TransactionUndone { transaction_id } = event {
2099            if self.generation_transaction_id == Some(*transaction_id) {
2100                self.generation_transaction_id = None;
2101                self.generation = Task::ready(());
2102                cx.emit(CodegenEvent::Undone);
2103            } else if self.prepend_transaction_id == Some(*transaction_id) {
2104                self.prepend_transaction_id = None;
2105                self.generation_transaction_id = None;
2106                self.generation = Task::ready(());
2107                cx.emit(CodegenEvent::Undone);
2108            }
2109        }
2110    }
2111
2112    pub fn last_equal_ranges(&self) -> &[Range<Anchor>] {
2113        &self.last_equal_ranges
2114    }
2115
2116    pub fn start(
2117        &mut self,
2118        telemetry_id: String,
2119        stream: impl 'static + Future<Output = Result<BoxStream<'static, Result<String>>>>,
2120        cx: &mut ModelContext<Self>,
2121    ) {
2122        let range = self.range.clone();
2123        let snapshot = self.snapshot.clone();
2124        let selected_text = snapshot
2125            .text_for_range(range.start..range.end)
2126            .collect::<Rope>();
2127
2128        let selection_start = range.start.to_point(&snapshot);
2129        let suggested_line_indent = snapshot
2130            .suggested_indents(selection_start.row..selection_start.row + 1, cx)
2131            .into_values()
2132            .next()
2133            .unwrap_or_else(|| snapshot.indent_size_for_line(MultiBufferRow(selection_start.row)));
2134
2135        let telemetry = self.telemetry.clone();
2136        self.edit_position = range.start;
2137        self.diff = Diff::default();
2138        self.status = CodegenStatus::Pending;
2139        if let Some(transaction_id) = self.generation_transaction_id.take() {
2140            self.buffer
2141                .update(cx, |buffer, cx| buffer.undo_transaction(transaction_id, cx));
2142        }
2143        self.generation = cx.spawn(|this, mut cx| {
2144            async move {
2145                let chunks = stream.await;
2146                let generate = async {
2147                    let mut edit_start = range.start.to_offset(&snapshot);
2148
2149                    let (mut hunks_tx, mut hunks_rx) = mpsc::channel(1);
2150                    let diff: Task<anyhow::Result<()>> =
2151                        cx.background_executor().spawn(async move {
2152                            let mut response_latency = None;
2153                            let request_start = Instant::now();
2154                            let diff = async {
2155                                let chunks = StripInvalidSpans::new(chunks?);
2156                                futures::pin_mut!(chunks);
2157                                let mut diff = StreamingDiff::new(selected_text.to_string());
2158
2159                                let mut new_text = String::new();
2160                                let mut base_indent = None;
2161                                let mut line_indent = None;
2162                                let mut first_line = true;
2163
2164                                while let Some(chunk) = chunks.next().await {
2165                                    if response_latency.is_none() {
2166                                        response_latency = Some(request_start.elapsed());
2167                                    }
2168                                    let chunk = chunk?;
2169
2170                                    let mut lines = chunk.split('\n').peekable();
2171                                    while let Some(line) = lines.next() {
2172                                        new_text.push_str(line);
2173                                        if line_indent.is_none() {
2174                                            if let Some(non_whitespace_ch_ix) =
2175                                                new_text.find(|ch: char| !ch.is_whitespace())
2176                                            {
2177                                                line_indent = Some(non_whitespace_ch_ix);
2178                                                base_indent = base_indent.or(line_indent);
2179
2180                                                let line_indent = line_indent.unwrap();
2181                                                let base_indent = base_indent.unwrap();
2182                                                let indent_delta =
2183                                                    line_indent as i32 - base_indent as i32;
2184                                                let mut corrected_indent_len = cmp::max(
2185                                                    0,
2186                                                    suggested_line_indent.len as i32 + indent_delta,
2187                                                )
2188                                                    as usize;
2189                                                if first_line {
2190                                                    corrected_indent_len = corrected_indent_len
2191                                                        .saturating_sub(
2192                                                            selection_start.column as usize,
2193                                                        );
2194                                                }
2195
2196                                                let indent_char = suggested_line_indent.char();
2197                                                let mut indent_buffer = [0; 4];
2198                                                let indent_str =
2199                                                    indent_char.encode_utf8(&mut indent_buffer);
2200                                                new_text.replace_range(
2201                                                    ..line_indent,
2202                                                    &indent_str.repeat(corrected_indent_len),
2203                                                );
2204                                            }
2205                                        }
2206
2207                                        if line_indent.is_some() {
2208                                            hunks_tx.send(diff.push_new(&new_text)).await?;
2209                                            new_text.clear();
2210                                        }
2211
2212                                        if lines.peek().is_some() {
2213                                            hunks_tx.send(diff.push_new("\n")).await?;
2214                                            if line_indent.is_none() {
2215                                                // Don't write out the leading indentation in empty lines on the next line
2216                                                // This is the case where the above if statement didn't clear the buffer
2217                                                new_text.clear();
2218                                            }
2219                                            line_indent = None;
2220                                            first_line = false;
2221                                        }
2222                                    }
2223                                }
2224                                hunks_tx.send(diff.push_new(&new_text)).await?;
2225                                hunks_tx.send(diff.finish()).await?;
2226
2227                                anyhow::Ok(())
2228                            };
2229
2230                            let result = diff.await;
2231
2232                            let error_message =
2233                                result.as_ref().err().map(|error| error.to_string());
2234                            if let Some(telemetry) = telemetry {
2235                                telemetry.report_assistant_event(
2236                                    None,
2237                                    telemetry_events::AssistantKind::Inline,
2238                                    telemetry_id,
2239                                    response_latency,
2240                                    error_message,
2241                                );
2242                            }
2243
2244                            result?;
2245                            Ok(())
2246                        });
2247
2248                    while let Some(hunks) = hunks_rx.next().await {
2249                        this.update(&mut cx, |this, cx| {
2250                            this.last_equal_ranges.clear();
2251
2252                            let transaction = this.buffer.update(cx, |buffer, cx| {
2253                                // Avoid grouping assistant edits with user edits.
2254                                buffer.finalize_last_transaction(cx);
2255
2256                                buffer.start_transaction(cx);
2257                                buffer.edit(
2258                                    hunks.into_iter().filter_map(|hunk| match hunk {
2259                                        Hunk::Insert { text } => {
2260                                            let edit_start = snapshot.anchor_after(edit_start);
2261                                            Some((edit_start..edit_start, text))
2262                                        }
2263                                        Hunk::Remove { len } => {
2264                                            let edit_end = edit_start + len;
2265                                            let edit_range = snapshot.anchor_after(edit_start)
2266                                                ..snapshot.anchor_before(edit_end);
2267                                            edit_start = edit_end;
2268                                            Some((edit_range, String::new()))
2269                                        }
2270                                        Hunk::Keep { len } => {
2271                                            let edit_end = edit_start + len;
2272                                            let edit_range = snapshot.anchor_after(edit_start)
2273                                                ..snapshot.anchor_before(edit_end);
2274                                            edit_start = edit_end;
2275                                            this.last_equal_ranges.push(edit_range);
2276                                            None
2277                                        }
2278                                    }),
2279                                    None,
2280                                    cx,
2281                                );
2282                                this.edit_position = snapshot.anchor_after(edit_start);
2283
2284                                buffer.end_transaction(cx)
2285                            });
2286
2287                            if let Some(transaction) = transaction {
2288                                if let Some(first_transaction) = this.generation_transaction_id {
2289                                    // Group all assistant edits into the first transaction.
2290                                    this.buffer.update(cx, |buffer, cx| {
2291                                        buffer.merge_transactions(
2292                                            transaction,
2293                                            first_transaction,
2294                                            cx,
2295                                        )
2296                                    });
2297                                } else {
2298                                    this.generation_transaction_id = Some(transaction);
2299                                    this.buffer.update(cx, |buffer, cx| {
2300                                        buffer.finalize_last_transaction(cx)
2301                                    });
2302                                }
2303                            }
2304
2305                            this.update_diff(cx);
2306                            cx.notify();
2307                        })?;
2308                    }
2309
2310                    diff.await?;
2311
2312                    anyhow::Ok(())
2313                };
2314
2315                let result = generate.await;
2316                this.update(&mut cx, |this, cx| {
2317                    this.last_equal_ranges.clear();
2318                    if let Err(error) = result {
2319                        this.status = CodegenStatus::Error(error);
2320                    } else {
2321                        this.status = CodegenStatus::Done;
2322                    }
2323                    cx.emit(CodegenEvent::Finished);
2324                    cx.notify();
2325                })
2326                .ok();
2327            }
2328        });
2329        cx.notify();
2330    }
2331
2332    pub fn stop(&mut self, cx: &mut ModelContext<Self>) {
2333        self.last_equal_ranges.clear();
2334        self.status = CodegenStatus::Done;
2335        self.generation = Task::ready(());
2336        cx.emit(CodegenEvent::Finished);
2337        cx.notify();
2338    }
2339
2340    pub fn undo(&mut self, cx: &mut ModelContext<Self>) {
2341        if let Some(transaction_id) = self.prepend_transaction_id.take() {
2342            self.buffer
2343                .update(cx, |buffer, cx| buffer.undo_transaction(transaction_id, cx));
2344        }
2345
2346        if let Some(transaction_id) = self.generation_transaction_id.take() {
2347            self.buffer
2348                .update(cx, |buffer, cx| buffer.undo_transaction(transaction_id, cx));
2349        }
2350    }
2351
2352    fn update_diff(&mut self, cx: &mut ModelContext<Self>) {
2353        if self.diff.task.is_some() {
2354            self.diff.should_update = true;
2355        } else {
2356            self.diff.should_update = false;
2357
2358            let old_snapshot = self.snapshot.clone();
2359            let old_range = self.range.to_point(&old_snapshot);
2360            let new_snapshot = self.buffer.read(cx).snapshot(cx);
2361            let new_range = self.range.to_point(&new_snapshot);
2362
2363            self.diff.task = Some(cx.spawn(|this, mut cx| async move {
2364                let (deleted_row_ranges, inserted_row_ranges) = cx
2365                    .background_executor()
2366                    .spawn(async move {
2367                        let old_text = old_snapshot
2368                            .text_for_range(
2369                                Point::new(old_range.start.row, 0)
2370                                    ..Point::new(
2371                                        old_range.end.row,
2372                                        old_snapshot.line_len(MultiBufferRow(old_range.end.row)),
2373                                    ),
2374                            )
2375                            .collect::<String>();
2376                        let new_text = new_snapshot
2377                            .text_for_range(
2378                                Point::new(new_range.start.row, 0)
2379                                    ..Point::new(
2380                                        new_range.end.row,
2381                                        new_snapshot.line_len(MultiBufferRow(new_range.end.row)),
2382                                    ),
2383                            )
2384                            .collect::<String>();
2385
2386                        let mut old_row = old_range.start.row;
2387                        let mut new_row = new_range.start.row;
2388                        let diff = TextDiff::from_lines(old_text.as_str(), new_text.as_str());
2389
2390                        let mut deleted_row_ranges: Vec<(Anchor, RangeInclusive<u32>)> = Vec::new();
2391                        let mut inserted_row_ranges = Vec::new();
2392                        for change in diff.iter_all_changes() {
2393                            let line_count = change.value().lines().count() as u32;
2394                            match change.tag() {
2395                                similar::ChangeTag::Equal => {
2396                                    old_row += line_count;
2397                                    new_row += line_count;
2398                                }
2399                                similar::ChangeTag::Delete => {
2400                                    let old_end_row = old_row + line_count - 1;
2401                                    let new_row =
2402                                        new_snapshot.anchor_before(Point::new(new_row, 0));
2403
2404                                    if let Some((_, last_deleted_row_range)) =
2405                                        deleted_row_ranges.last_mut()
2406                                    {
2407                                        if *last_deleted_row_range.end() + 1 == old_row {
2408                                            *last_deleted_row_range =
2409                                                *last_deleted_row_range.start()..=old_end_row;
2410                                        } else {
2411                                            deleted_row_ranges
2412                                                .push((new_row, old_row..=old_end_row));
2413                                        }
2414                                    } else {
2415                                        deleted_row_ranges.push((new_row, old_row..=old_end_row));
2416                                    }
2417
2418                                    old_row += line_count;
2419                                }
2420                                similar::ChangeTag::Insert => {
2421                                    let new_end_row = new_row + line_count - 1;
2422                                    let start = new_snapshot.anchor_before(Point::new(new_row, 0));
2423                                    let end = new_snapshot.anchor_before(Point::new(
2424                                        new_end_row,
2425                                        new_snapshot.line_len(MultiBufferRow(new_end_row)),
2426                                    ));
2427                                    inserted_row_ranges.push(start..=end);
2428                                    new_row += line_count;
2429                                }
2430                            }
2431                        }
2432
2433                        (deleted_row_ranges, inserted_row_ranges)
2434                    })
2435                    .await;
2436
2437                this.update(&mut cx, |this, cx| {
2438                    this.diff.deleted_row_ranges = deleted_row_ranges;
2439                    this.diff.inserted_row_ranges = inserted_row_ranges;
2440                    this.diff.task = None;
2441                    if this.diff.should_update {
2442                        this.update_diff(cx);
2443                    }
2444                    cx.notify();
2445                })
2446                .ok();
2447            }));
2448        }
2449    }
2450}
2451
2452struct StripInvalidSpans<T> {
2453    stream: T,
2454    stream_done: bool,
2455    buffer: String,
2456    first_line: bool,
2457    line_end: bool,
2458    starts_with_code_block: bool,
2459}
2460
2461impl<T> StripInvalidSpans<T>
2462where
2463    T: Stream<Item = Result<String>>,
2464{
2465    fn new(stream: T) -> Self {
2466        Self {
2467            stream,
2468            stream_done: false,
2469            buffer: String::new(),
2470            first_line: true,
2471            line_end: false,
2472            starts_with_code_block: false,
2473        }
2474    }
2475}
2476
2477impl<T> Stream for StripInvalidSpans<T>
2478where
2479    T: Stream<Item = Result<String>>,
2480{
2481    type Item = Result<String>;
2482
2483    fn poll_next(self: Pin<&mut Self>, cx: &mut task::Context) -> Poll<Option<Self::Item>> {
2484        const CODE_BLOCK_DELIMITER: &str = "```";
2485        const CURSOR_SPAN: &str = "<|CURSOR|>";
2486
2487        let this = unsafe { self.get_unchecked_mut() };
2488        loop {
2489            if !this.stream_done {
2490                let mut stream = unsafe { Pin::new_unchecked(&mut this.stream) };
2491                match stream.as_mut().poll_next(cx) {
2492                    Poll::Ready(Some(Ok(chunk))) => {
2493                        this.buffer.push_str(&chunk);
2494                    }
2495                    Poll::Ready(Some(Err(error))) => return Poll::Ready(Some(Err(error))),
2496                    Poll::Ready(None) => {
2497                        this.stream_done = true;
2498                    }
2499                    Poll::Pending => return Poll::Pending,
2500                }
2501            }
2502
2503            let mut chunk = String::new();
2504            let mut consumed = 0;
2505            if !this.buffer.is_empty() {
2506                let mut lines = this.buffer.split('\n').enumerate().peekable();
2507                while let Some((line_ix, line)) = lines.next() {
2508                    if line_ix > 0 {
2509                        this.first_line = false;
2510                    }
2511
2512                    if this.first_line {
2513                        let trimmed_line = line.trim();
2514                        if lines.peek().is_some() {
2515                            if trimmed_line.starts_with(CODE_BLOCK_DELIMITER) {
2516                                consumed += line.len() + 1;
2517                                this.starts_with_code_block = true;
2518                                continue;
2519                            }
2520                        } else if trimmed_line.is_empty()
2521                            || prefixes(CODE_BLOCK_DELIMITER)
2522                                .any(|prefix| trimmed_line.starts_with(prefix))
2523                        {
2524                            break;
2525                        }
2526                    }
2527
2528                    let line_without_cursor = line.replace(CURSOR_SPAN, "");
2529                    if lines.peek().is_some() {
2530                        if this.line_end {
2531                            chunk.push('\n');
2532                        }
2533
2534                        chunk.push_str(&line_without_cursor);
2535                        this.line_end = true;
2536                        consumed += line.len() + 1;
2537                    } else if this.stream_done {
2538                        if !this.starts_with_code_block
2539                            || !line_without_cursor.trim().ends_with(CODE_BLOCK_DELIMITER)
2540                        {
2541                            if this.line_end {
2542                                chunk.push('\n');
2543                            }
2544
2545                            chunk.push_str(&line);
2546                        }
2547
2548                        consumed += line.len();
2549                    } else {
2550                        let trimmed_line = line.trim();
2551                        if trimmed_line.is_empty()
2552                            || prefixes(CURSOR_SPAN).any(|prefix| trimmed_line.ends_with(prefix))
2553                            || prefixes(CODE_BLOCK_DELIMITER)
2554                                .any(|prefix| trimmed_line.ends_with(prefix))
2555                        {
2556                            break;
2557                        } else {
2558                            if this.line_end {
2559                                chunk.push('\n');
2560                                this.line_end = false;
2561                            }
2562
2563                            chunk.push_str(&line_without_cursor);
2564                            consumed += line.len();
2565                        }
2566                    }
2567                }
2568            }
2569
2570            this.buffer = this.buffer.split_off(consumed);
2571            if !chunk.is_empty() {
2572                return Poll::Ready(Some(Ok(chunk)));
2573            } else if this.stream_done {
2574                return Poll::Ready(None);
2575            }
2576        }
2577    }
2578}
2579
2580fn prefixes(text: &str) -> impl Iterator<Item = &str> {
2581    (0..text.len() - 1).map(|ix| &text[..ix + 1])
2582}
2583
2584fn merge_ranges(ranges: &mut Vec<Range<Anchor>>, buffer: &MultiBufferSnapshot) {
2585    ranges.sort_unstable_by(|a, b| {
2586        a.start
2587            .cmp(&b.start, buffer)
2588            .then_with(|| b.end.cmp(&a.end, buffer))
2589    });
2590
2591    let mut ix = 0;
2592    while ix + 1 < ranges.len() {
2593        let b = ranges[ix + 1].clone();
2594        let a = &mut ranges[ix];
2595        if a.end.cmp(&b.start, buffer).is_gt() {
2596            if a.end.cmp(&b.end, buffer).is_lt() {
2597                a.end = b.end;
2598            }
2599            ranges.remove(ix + 1);
2600        } else {
2601            ix += 1;
2602        }
2603    }
2604}
2605
2606#[cfg(test)]
2607mod tests {
2608    use super::*;
2609    use crate::FakeCompletionProvider;
2610    use futures::stream::{self};
2611    use gpui::{Context, TestAppContext};
2612    use indoc::indoc;
2613    use language::{
2614        language_settings, tree_sitter_rust, Buffer, Language, LanguageConfig, LanguageMatcher,
2615        Point,
2616    };
2617    use rand::prelude::*;
2618    use serde::Serialize;
2619    use settings::SettingsStore;
2620    use std::{future, sync::Arc};
2621
2622    #[derive(Serialize)]
2623    pub struct DummyCompletionRequest {
2624        pub name: String,
2625    }
2626
2627    #[gpui::test(iterations = 10)]
2628    async fn test_transform_autoindent(cx: &mut TestAppContext, mut rng: StdRng) {
2629        cx.set_global(cx.update(SettingsStore::test));
2630        cx.update(|cx| FakeCompletionProvider::setup_test(cx));
2631        cx.update(language_settings::init);
2632
2633        let text = indoc! {"
2634            fn main() {
2635                let x = 0;
2636                for _ in 0..10 {
2637                    x += 1;
2638                }
2639            }
2640        "};
2641        let buffer =
2642            cx.new_model(|cx| Buffer::local(text, cx).with_language(Arc::new(rust_lang()), cx));
2643        let buffer = cx.new_model(|cx| MultiBuffer::singleton(buffer, cx));
2644        let range = buffer.read_with(cx, |buffer, cx| {
2645            let snapshot = buffer.snapshot(cx);
2646            snapshot.anchor_before(Point::new(1, 0))..snapshot.anchor_after(Point::new(4, 5))
2647        });
2648        let codegen = cx.new_model(|cx| Codegen::new(buffer.clone(), range, None, None, cx));
2649
2650        let (chunks_tx, chunks_rx) = mpsc::unbounded();
2651        codegen.update(cx, |codegen, cx| {
2652            codegen.start(
2653                String::new(),
2654                future::ready(Ok(chunks_rx.map(|chunk| Ok(chunk)).boxed())),
2655                cx,
2656            )
2657        });
2658
2659        let mut new_text = concat!(
2660            "       let mut x = 0;\n",
2661            "       while x < 10 {\n",
2662            "           x += 1;\n",
2663            "       }",
2664        );
2665        while !new_text.is_empty() {
2666            let max_len = cmp::min(new_text.len(), 10);
2667            let len = rng.gen_range(1..=max_len);
2668            let (chunk, suffix) = new_text.split_at(len);
2669            chunks_tx.unbounded_send(chunk.to_string()).unwrap();
2670            new_text = suffix;
2671            cx.background_executor.run_until_parked();
2672        }
2673        drop(chunks_tx);
2674        cx.background_executor.run_until_parked();
2675
2676        assert_eq!(
2677            buffer.read_with(cx, |buffer, cx| buffer.snapshot(cx).text()),
2678            indoc! {"
2679                fn main() {
2680                    let mut x = 0;
2681                    while x < 10 {
2682                        x += 1;
2683                    }
2684                }
2685            "}
2686        );
2687    }
2688
2689    #[gpui::test(iterations = 10)]
2690    async fn test_autoindent_when_generating_past_indentation(
2691        cx: &mut TestAppContext,
2692        mut rng: StdRng,
2693    ) {
2694        cx.set_global(cx.update(SettingsStore::test));
2695        cx.update(language_settings::init);
2696
2697        let text = indoc! {"
2698            fn main() {
2699                le
2700            }
2701        "};
2702        let buffer =
2703            cx.new_model(|cx| Buffer::local(text, cx).with_language(Arc::new(rust_lang()), cx));
2704        let buffer = cx.new_model(|cx| MultiBuffer::singleton(buffer, cx));
2705        let range = buffer.read_with(cx, |buffer, cx| {
2706            let snapshot = buffer.snapshot(cx);
2707            snapshot.anchor_before(Point::new(1, 6))..snapshot.anchor_after(Point::new(1, 6))
2708        });
2709        let codegen = cx.new_model(|cx| Codegen::new(buffer.clone(), range, None, None, cx));
2710
2711        let (chunks_tx, chunks_rx) = mpsc::unbounded();
2712        codegen.update(cx, |codegen, cx| {
2713            codegen.start(
2714                String::new(),
2715                future::ready(Ok(chunks_rx.map(|chunk| Ok(chunk)).boxed())),
2716                cx,
2717            )
2718        });
2719
2720        cx.background_executor.run_until_parked();
2721
2722        let mut new_text = concat!(
2723            "t mut x = 0;\n",
2724            "while x < 10 {\n",
2725            "    x += 1;\n",
2726            "}", //
2727        );
2728        while !new_text.is_empty() {
2729            let max_len = cmp::min(new_text.len(), 10);
2730            let len = rng.gen_range(1..=max_len);
2731            let (chunk, suffix) = new_text.split_at(len);
2732            chunks_tx.unbounded_send(chunk.to_string()).unwrap();
2733            new_text = suffix;
2734            cx.background_executor.run_until_parked();
2735        }
2736        drop(chunks_tx);
2737        cx.background_executor.run_until_parked();
2738
2739        assert_eq!(
2740            buffer.read_with(cx, |buffer, cx| buffer.snapshot(cx).text()),
2741            indoc! {"
2742                fn main() {
2743                    let mut x = 0;
2744                    while x < 10 {
2745                        x += 1;
2746                    }
2747                }
2748            "}
2749        );
2750    }
2751
2752    #[gpui::test(iterations = 10)]
2753    async fn test_autoindent_when_generating_before_indentation(
2754        cx: &mut TestAppContext,
2755        mut rng: StdRng,
2756    ) {
2757        cx.update(|cx| FakeCompletionProvider::setup_test(cx));
2758        cx.set_global(cx.update(SettingsStore::test));
2759        cx.update(language_settings::init);
2760
2761        let text = concat!(
2762            "fn main() {\n",
2763            "  \n",
2764            "}\n" //
2765        );
2766        let buffer =
2767            cx.new_model(|cx| Buffer::local(text, cx).with_language(Arc::new(rust_lang()), cx));
2768        let buffer = cx.new_model(|cx| MultiBuffer::singleton(buffer, cx));
2769        let range = buffer.read_with(cx, |buffer, cx| {
2770            let snapshot = buffer.snapshot(cx);
2771            snapshot.anchor_before(Point::new(1, 2))..snapshot.anchor_after(Point::new(1, 2))
2772        });
2773        let codegen = cx.new_model(|cx| Codegen::new(buffer.clone(), range, None, None, cx));
2774
2775        let (chunks_tx, chunks_rx) = mpsc::unbounded();
2776        codegen.update(cx, |codegen, cx| {
2777            codegen.start(
2778                String::new(),
2779                future::ready(Ok(chunks_rx.map(|chunk| Ok(chunk)).boxed())),
2780                cx,
2781            )
2782        });
2783
2784        cx.background_executor.run_until_parked();
2785
2786        let mut new_text = concat!(
2787            "let mut x = 0;\n",
2788            "while x < 10 {\n",
2789            "    x += 1;\n",
2790            "}", //
2791        );
2792        while !new_text.is_empty() {
2793            let max_len = cmp::min(new_text.len(), 10);
2794            let len = rng.gen_range(1..=max_len);
2795            let (chunk, suffix) = new_text.split_at(len);
2796            chunks_tx.unbounded_send(chunk.to_string()).unwrap();
2797            new_text = suffix;
2798            cx.background_executor.run_until_parked();
2799        }
2800        drop(chunks_tx);
2801        cx.background_executor.run_until_parked();
2802
2803        assert_eq!(
2804            buffer.read_with(cx, |buffer, cx| buffer.snapshot(cx).text()),
2805            indoc! {"
2806                fn main() {
2807                    let mut x = 0;
2808                    while x < 10 {
2809                        x += 1;
2810                    }
2811                }
2812            "}
2813        );
2814    }
2815
2816    #[gpui::test]
2817    async fn test_strip_invalid_spans_from_codeblock() {
2818        assert_chunks("Lorem ipsum dolor", "Lorem ipsum dolor").await;
2819        assert_chunks("```\nLorem ipsum dolor", "Lorem ipsum dolor").await;
2820        assert_chunks("```\nLorem ipsum dolor\n```", "Lorem ipsum dolor").await;
2821        assert_chunks(
2822            "```html\n```js\nLorem ipsum dolor\n```\n```",
2823            "```js\nLorem ipsum dolor\n```",
2824        )
2825        .await;
2826        assert_chunks("``\nLorem ipsum dolor\n```", "``\nLorem ipsum dolor\n```").await;
2827        assert_chunks("Lorem<|CURSOR|> ipsum", "Lorem ipsum").await;
2828        assert_chunks("Lorem ipsum", "Lorem ipsum").await;
2829        assert_chunks("```\n<|CURSOR|>Lorem ipsum\n```", "Lorem ipsum").await;
2830
2831        async fn assert_chunks(text: &str, expected_text: &str) {
2832            for chunk_size in 1..=text.len() {
2833                let actual_text = StripInvalidSpans::new(chunks(text, chunk_size))
2834                    .map(|chunk| chunk.unwrap())
2835                    .collect::<String>()
2836                    .await;
2837                assert_eq!(
2838                    actual_text, expected_text,
2839                    "failed to strip invalid spans, chunk size: {}",
2840                    chunk_size
2841                );
2842            }
2843        }
2844
2845        fn chunks(text: &str, size: usize) -> impl Stream<Item = Result<String>> {
2846            stream::iter(
2847                text.chars()
2848                    .collect::<Vec<_>>()
2849                    .chunks(size)
2850                    .map(|chunk| Ok(chunk.iter().collect::<String>()))
2851                    .collect::<Vec<_>>(),
2852            )
2853        }
2854    }
2855
2856    fn rust_lang() -> Language {
2857        Language::new(
2858            LanguageConfig {
2859                name: "Rust".into(),
2860                matcher: LanguageMatcher {
2861                    path_suffixes: vec!["rs".to_string()],
2862                    ..Default::default()
2863                },
2864                ..Default::default()
2865            },
2866            Some(tree_sitter_rust::language()),
2867        )
2868        .with_indents_query(
2869            r#"
2870            (call_expression) @indent
2871            (field_expression) @indent
2872            (_ "(" ")" @end) @indent
2873            (_ "{" "}" @end) @indent
2874            "#,
2875        )
2876        .unwrap()
2877    }
2878}