1use crate::{
   2    display_map::ToDisplayPoint, link_go_to_definition::hide_link_definition,
   3    movement::surrounding_word, persistence::DB, scroll::ScrollAnchor, Anchor, Autoscroll, Editor,
   4    Event, ExcerptId, ExcerptRange, MultiBuffer, MultiBufferSnapshot, NavigationData, ToPoint as _,
   5};
   6use anyhow::{Context, Result};
   7use collections::HashSet;
   8use futures::future::try_join_all;
   9use gpui::{
  10    elements::*, geometry::vector::vec2f, AppContext, AsyncAppContext, Entity, ModelHandle,
  11    Subscription, Task, View, ViewContext, ViewHandle, WeakViewHandle,
  12};
  13use language::{
  14    proto::serialize_anchor as serialize_text_anchor, Bias, Buffer, OffsetRangeExt, Point,
  15    SelectionGoal,
  16};
  17use project::{FormatTrigger, Item as _, Project, ProjectPath};
  18use rpc::proto::{self, update_view};
  19use smallvec::SmallVec;
  20use std::{
  21    borrow::Cow,
  22    cmp::{self, Ordering},
  23    fmt::Write,
  24    iter,
  25    ops::Range,
  26    path::{Path, PathBuf},
  27};
  28use text::Selection;
  29use util::{paths::FILE_ROW_COLUMN_DELIMITER, ResultExt, TryFutureExt};
  30use workspace::item::{BreadcrumbText, FollowableItemHandle};
  31use workspace::{
  32    item::{FollowableItem, Item, ItemEvent, ItemHandle, ProjectItem},
  33    searchable::{Direction, SearchEvent, SearchableItem, SearchableItemHandle},
  34    ItemId, ItemNavHistory, Pane, StatusItemView, ToolbarItemLocation, ViewId, Workspace,
  35    WorkspaceId,
  36};
  37
  38pub const MAX_TAB_TITLE_LEN: usize = 24;
  39
  40impl FollowableItem for Editor {
  41    fn remote_id(&self) -> Option<ViewId> {
  42        self.remote_id
  43    }
  44
  45    fn from_state_proto(
  46        pane: ViewHandle<workspace::Pane>,
  47        project: ModelHandle<Project>,
  48        remote_id: ViewId,
  49        state: &mut Option<proto::view::Variant>,
  50        cx: &mut AppContext,
  51    ) -> Option<Task<Result<ViewHandle<Self>>>> {
  52        let Some(proto::view::Variant::Editor(_)) = state else { return None };
  53        let Some(proto::view::Variant::Editor(state)) = state.take() else { unreachable!() };
  54
  55        let client = project.read(cx).client();
  56        let replica_id = project.read(cx).replica_id();
  57        let buffer_ids = state
  58            .excerpts
  59            .iter()
  60            .map(|excerpt| excerpt.buffer_id)
  61            .collect::<HashSet<_>>();
  62        let buffers = project.update(cx, |project, cx| {
  63            buffer_ids
  64                .iter()
  65                .map(|id| project.open_buffer_by_id(*id, cx))
  66                .collect::<Vec<_>>()
  67        });
  68
  69        let pane = pane.downgrade();
  70        Some(cx.spawn(|mut cx| async move {
  71            let mut buffers = futures::future::try_join_all(buffers).await?;
  72            let editor = pane.read_with(&cx, |pane, cx| {
  73                let mut editors = pane.items_of_type::<Self>();
  74                editors.find(|editor| {
  75                    let ids_match = editor.remote_id(&client, cx) == Some(remote_id);
  76                    let singleton_buffer_matches = state.singleton
  77                        && buffers.first()
  78                            == editor.read(cx).buffer.read(cx).as_singleton().as_ref();
  79                    ids_match || singleton_buffer_matches
  80                })
  81            })?;
  82
  83            let editor = if let Some(editor) = editor {
  84                editor
  85            } else {
  86                pane.update(&mut cx, |_, cx| {
  87                    let multibuffer = cx.add_model(|cx| {
  88                        let mut multibuffer;
  89                        if state.singleton && buffers.len() == 1 {
  90                            multibuffer = MultiBuffer::singleton(buffers.pop().unwrap(), cx)
  91                        } else {
  92                            multibuffer = MultiBuffer::new(replica_id);
  93                            let mut excerpts = state.excerpts.into_iter().peekable();
  94                            while let Some(excerpt) = excerpts.peek() {
  95                                let buffer_id = excerpt.buffer_id;
  96                                let buffer_excerpts = iter::from_fn(|| {
  97                                    let excerpt = excerpts.peek()?;
  98                                    (excerpt.buffer_id == buffer_id)
  99                                        .then(|| excerpts.next().unwrap())
 100                                });
 101                                let buffer =
 102                                    buffers.iter().find(|b| b.read(cx).remote_id() == buffer_id);
 103                                if let Some(buffer) = buffer {
 104                                    multibuffer.push_excerpts(
 105                                        buffer.clone(),
 106                                        buffer_excerpts.filter_map(deserialize_excerpt_range),
 107                                        cx,
 108                                    );
 109                                }
 110                            }
 111                        };
 112
 113                        if let Some(title) = &state.title {
 114                            multibuffer = multibuffer.with_title(title.clone())
 115                        }
 116
 117                        multibuffer
 118                    });
 119
 120                    cx.add_view(|cx| {
 121                        let mut editor =
 122                            Editor::for_multibuffer(multibuffer, Some(project.clone()), cx);
 123                        editor.remote_id = Some(remote_id);
 124                        editor
 125                    })
 126                })?
 127            };
 128
 129            update_editor_from_message(
 130                editor.downgrade(),
 131                project,
 132                proto::update_view::Editor {
 133                    selections: state.selections,
 134                    pending_selection: state.pending_selection,
 135                    scroll_top_anchor: state.scroll_top_anchor,
 136                    scroll_x: state.scroll_x,
 137                    scroll_y: state.scroll_y,
 138                    ..Default::default()
 139                },
 140                &mut cx,
 141            )
 142            .await?;
 143
 144            Ok(editor)
 145        }))
 146    }
 147
 148    fn set_leader_replica_id(
 149        &mut self,
 150        leader_replica_id: Option<u16>,
 151        cx: &mut ViewContext<Self>,
 152    ) {
 153        self.leader_replica_id = leader_replica_id;
 154        if self.leader_replica_id.is_some() {
 155            self.buffer.update(cx, |buffer, cx| {
 156                buffer.remove_active_selections(cx);
 157            });
 158        } else {
 159            self.buffer.update(cx, |buffer, cx| {
 160                if self.focused {
 161                    buffer.set_active_selections(
 162                        &self.selections.disjoint_anchors(),
 163                        self.selections.line_mode,
 164                        self.cursor_shape,
 165                        cx,
 166                    );
 167                }
 168            });
 169        }
 170        cx.notify();
 171    }
 172
 173    fn to_state_proto(&self, cx: &AppContext) -> Option<proto::view::Variant> {
 174        let buffer = self.buffer.read(cx);
 175        let scroll_anchor = self.scroll_manager.anchor();
 176        let excerpts = buffer
 177            .read(cx)
 178            .excerpts()
 179            .map(|(id, buffer, range)| proto::Excerpt {
 180                id: id.to_proto(),
 181                buffer_id: buffer.remote_id(),
 182                context_start: Some(serialize_text_anchor(&range.context.start)),
 183                context_end: Some(serialize_text_anchor(&range.context.end)),
 184                primary_start: range
 185                    .primary
 186                    .as_ref()
 187                    .map(|range| serialize_text_anchor(&range.start)),
 188                primary_end: range
 189                    .primary
 190                    .as_ref()
 191                    .map(|range| serialize_text_anchor(&range.end)),
 192            })
 193            .collect();
 194
 195        Some(proto::view::Variant::Editor(proto::view::Editor {
 196            singleton: buffer.is_singleton(),
 197            title: (!buffer.is_singleton()).then(|| buffer.title(cx).into()),
 198            excerpts,
 199            scroll_top_anchor: Some(serialize_anchor(&scroll_anchor.anchor)),
 200            scroll_x: scroll_anchor.offset.x(),
 201            scroll_y: scroll_anchor.offset.y(),
 202            selections: self
 203                .selections
 204                .disjoint_anchors()
 205                .iter()
 206                .map(serialize_selection)
 207                .collect(),
 208            pending_selection: self
 209                .selections
 210                .pending_anchor()
 211                .as_ref()
 212                .map(serialize_selection),
 213        }))
 214    }
 215
 216    fn add_event_to_update_proto(
 217        &self,
 218        event: &Self::Event,
 219        update: &mut Option<proto::update_view::Variant>,
 220        cx: &AppContext,
 221    ) -> bool {
 222        let update =
 223            update.get_or_insert_with(|| proto::update_view::Variant::Editor(Default::default()));
 224
 225        match update {
 226            proto::update_view::Variant::Editor(update) => match event {
 227                Event::ExcerptsAdded {
 228                    buffer,
 229                    predecessor,
 230                    excerpts,
 231                } => {
 232                    let buffer_id = buffer.read(cx).remote_id();
 233                    let mut excerpts = excerpts.iter();
 234                    if let Some((id, range)) = excerpts.next() {
 235                        update.inserted_excerpts.push(proto::ExcerptInsertion {
 236                            previous_excerpt_id: Some(predecessor.to_proto()),
 237                            excerpt: serialize_excerpt(buffer_id, id, range),
 238                        });
 239                        update.inserted_excerpts.extend(excerpts.map(|(id, range)| {
 240                            proto::ExcerptInsertion {
 241                                previous_excerpt_id: None,
 242                                excerpt: serialize_excerpt(buffer_id, id, range),
 243                            }
 244                        }))
 245                    }
 246                    true
 247                }
 248                Event::ExcerptsRemoved { ids } => {
 249                    update
 250                        .deleted_excerpts
 251                        .extend(ids.iter().map(ExcerptId::to_proto));
 252                    true
 253                }
 254                Event::ScrollPositionChanged { .. } => {
 255                    let scroll_anchor = self.scroll_manager.anchor();
 256                    update.scroll_top_anchor = Some(serialize_anchor(&scroll_anchor.anchor));
 257                    update.scroll_x = scroll_anchor.offset.x();
 258                    update.scroll_y = scroll_anchor.offset.y();
 259                    true
 260                }
 261                Event::SelectionsChanged { .. } => {
 262                    update.selections = self
 263                        .selections
 264                        .disjoint_anchors()
 265                        .iter()
 266                        .map(serialize_selection)
 267                        .collect();
 268                    update.pending_selection = self
 269                        .selections
 270                        .pending_anchor()
 271                        .as_ref()
 272                        .map(serialize_selection);
 273                    true
 274                }
 275                _ => false,
 276            },
 277        }
 278    }
 279
 280    fn apply_update_proto(
 281        &mut self,
 282        project: &ModelHandle<Project>,
 283        message: update_view::Variant,
 284        cx: &mut ViewContext<Self>,
 285    ) -> Task<Result<()>> {
 286        let update_view::Variant::Editor(message) = message;
 287        let project = project.clone();
 288        cx.spawn(|this, mut cx| async move {
 289            update_editor_from_message(this, project, message, &mut cx).await
 290        })
 291    }
 292
 293    fn should_unfollow_on_event(event: &Self::Event, _: &AppContext) -> bool {
 294        match event {
 295            Event::Edited => true,
 296            Event::SelectionsChanged { local } => *local,
 297            Event::ScrollPositionChanged { local, .. } => *local,
 298            _ => false,
 299        }
 300    }
 301}
 302
 303async fn update_editor_from_message(
 304    this: WeakViewHandle<Editor>,
 305    project: ModelHandle<Project>,
 306    message: proto::update_view::Editor,
 307    cx: &mut AsyncAppContext,
 308) -> Result<()> {
 309    // Open all of the buffers of which excerpts were added to the editor.
 310    let inserted_excerpt_buffer_ids = message
 311        .inserted_excerpts
 312        .iter()
 313        .filter_map(|insertion| Some(insertion.excerpt.as_ref()?.buffer_id))
 314        .collect::<HashSet<_>>();
 315    let inserted_excerpt_buffers = project.update(cx, |project, cx| {
 316        inserted_excerpt_buffer_ids
 317            .into_iter()
 318            .map(|id| project.open_buffer_by_id(id, cx))
 319            .collect::<Vec<_>>()
 320    });
 321    let _inserted_excerpt_buffers = try_join_all(inserted_excerpt_buffers).await?;
 322
 323    // Update the editor's excerpts.
 324    this.update(cx, |editor, cx| {
 325        editor.buffer.update(cx, |multibuffer, cx| {
 326            let mut removed_excerpt_ids = message
 327                .deleted_excerpts
 328                .into_iter()
 329                .map(ExcerptId::from_proto)
 330                .collect::<Vec<_>>();
 331            removed_excerpt_ids.sort_by({
 332                let multibuffer = multibuffer.read(cx);
 333                move |a, b| a.cmp(&b, &multibuffer)
 334            });
 335
 336            let mut insertions = message.inserted_excerpts.into_iter().peekable();
 337            while let Some(insertion) = insertions.next() {
 338                let Some(excerpt) = insertion.excerpt else { continue };
 339                let Some(previous_excerpt_id) = insertion.previous_excerpt_id else { continue };
 340                let buffer_id = excerpt.buffer_id;
 341                let Some(buffer) = project.read(cx).buffer_for_id(buffer_id, cx) else { continue };
 342
 343                let adjacent_excerpts = iter::from_fn(|| {
 344                    let insertion = insertions.peek()?;
 345                    if insertion.previous_excerpt_id.is_none()
 346                        && insertion.excerpt.as_ref()?.buffer_id == buffer_id
 347                    {
 348                        insertions.next()?.excerpt
 349                    } else {
 350                        None
 351                    }
 352                });
 353
 354                multibuffer.insert_excerpts_with_ids_after(
 355                    ExcerptId::from_proto(previous_excerpt_id),
 356                    buffer,
 357                    [excerpt]
 358                        .into_iter()
 359                        .chain(adjacent_excerpts)
 360                        .filter_map(|excerpt| {
 361                            Some((
 362                                ExcerptId::from_proto(excerpt.id),
 363                                deserialize_excerpt_range(excerpt)?,
 364                            ))
 365                        }),
 366                    cx,
 367                );
 368            }
 369
 370            multibuffer.remove_excerpts(removed_excerpt_ids, cx);
 371        });
 372    })?;
 373
 374    // Deserialize the editor state.
 375    let (selections, pending_selection, scroll_top_anchor) = this.update(cx, |editor, cx| {
 376        let buffer = editor.buffer.read(cx).read(cx);
 377        let selections = message
 378            .selections
 379            .into_iter()
 380            .filter_map(|selection| deserialize_selection(&buffer, selection))
 381            .collect::<Vec<_>>();
 382        let pending_selection = message
 383            .pending_selection
 384            .and_then(|selection| deserialize_selection(&buffer, selection));
 385        let scroll_top_anchor = message
 386            .scroll_top_anchor
 387            .and_then(|anchor| deserialize_anchor(&buffer, anchor));
 388        anyhow::Ok((selections, pending_selection, scroll_top_anchor))
 389    })??;
 390
 391    // Wait until the buffer has received all of the operations referenced by
 392    // the editor's new state.
 393    this.update(cx, |editor, cx| {
 394        editor.buffer.update(cx, |buffer, cx| {
 395            buffer.wait_for_anchors(
 396                selections
 397                    .iter()
 398                    .chain(pending_selection.as_ref())
 399                    .flat_map(|selection| [selection.start, selection.end])
 400                    .chain(scroll_top_anchor),
 401                cx,
 402            )
 403        })
 404    })?
 405    .await?;
 406
 407    // Update the editor's state.
 408    this.update(cx, |editor, cx| {
 409        if !selections.is_empty() || pending_selection.is_some() {
 410            editor.set_selections_from_remote(selections, pending_selection, cx);
 411            editor.request_autoscroll_remotely(Autoscroll::newest(), cx);
 412        } else if let Some(scroll_top_anchor) = scroll_top_anchor {
 413            editor.set_scroll_anchor_remote(
 414                ScrollAnchor {
 415                    anchor: scroll_top_anchor,
 416                    offset: vec2f(message.scroll_x, message.scroll_y),
 417                },
 418                cx,
 419            );
 420        }
 421    })?;
 422    Ok(())
 423}
 424
 425fn serialize_excerpt(
 426    buffer_id: u64,
 427    id: &ExcerptId,
 428    range: &ExcerptRange<language::Anchor>,
 429) -> Option<proto::Excerpt> {
 430    Some(proto::Excerpt {
 431        id: id.to_proto(),
 432        buffer_id,
 433        context_start: Some(serialize_text_anchor(&range.context.start)),
 434        context_end: Some(serialize_text_anchor(&range.context.end)),
 435        primary_start: range
 436            .primary
 437            .as_ref()
 438            .map(|r| serialize_text_anchor(&r.start)),
 439        primary_end: range
 440            .primary
 441            .as_ref()
 442            .map(|r| serialize_text_anchor(&r.end)),
 443    })
 444}
 445
 446fn serialize_selection(selection: &Selection<Anchor>) -> proto::Selection {
 447    proto::Selection {
 448        id: selection.id as u64,
 449        start: Some(serialize_anchor(&selection.start)),
 450        end: Some(serialize_anchor(&selection.end)),
 451        reversed: selection.reversed,
 452    }
 453}
 454
 455fn serialize_anchor(anchor: &Anchor) -> proto::EditorAnchor {
 456    proto::EditorAnchor {
 457        excerpt_id: anchor.excerpt_id.to_proto(),
 458        anchor: Some(serialize_text_anchor(&anchor.text_anchor)),
 459    }
 460}
 461
 462fn deserialize_excerpt_range(excerpt: proto::Excerpt) -> Option<ExcerptRange<language::Anchor>> {
 463    let context = {
 464        let start = language::proto::deserialize_anchor(excerpt.context_start?)?;
 465        let end = language::proto::deserialize_anchor(excerpt.context_end?)?;
 466        start..end
 467    };
 468    let primary = excerpt
 469        .primary_start
 470        .zip(excerpt.primary_end)
 471        .and_then(|(start, end)| {
 472            let start = language::proto::deserialize_anchor(start)?;
 473            let end = language::proto::deserialize_anchor(end)?;
 474            Some(start..end)
 475        });
 476    Some(ExcerptRange { context, primary })
 477}
 478
 479fn deserialize_selection(
 480    buffer: &MultiBufferSnapshot,
 481    selection: proto::Selection,
 482) -> Option<Selection<Anchor>> {
 483    Some(Selection {
 484        id: selection.id as usize,
 485        start: deserialize_anchor(buffer, selection.start?)?,
 486        end: deserialize_anchor(buffer, selection.end?)?,
 487        reversed: selection.reversed,
 488        goal: SelectionGoal::None,
 489    })
 490}
 491
 492fn deserialize_anchor(buffer: &MultiBufferSnapshot, anchor: proto::EditorAnchor) -> Option<Anchor> {
 493    let excerpt_id = ExcerptId::from_proto(anchor.excerpt_id);
 494    Some(Anchor {
 495        excerpt_id,
 496        text_anchor: language::proto::deserialize_anchor(anchor.anchor?)?,
 497        buffer_id: buffer.buffer_id_for_excerpt(excerpt_id),
 498    })
 499}
 500
 501impl Item for Editor {
 502    fn navigate(&mut self, data: Box<dyn std::any::Any>, cx: &mut ViewContext<Self>) -> bool {
 503        if let Ok(data) = data.downcast::<NavigationData>() {
 504            let newest_selection = self.selections.newest::<Point>(cx);
 505            let buffer = self.buffer.read(cx).read(cx);
 506            let offset = if buffer.can_resolve(&data.cursor_anchor) {
 507                data.cursor_anchor.to_point(&buffer)
 508            } else {
 509                buffer.clip_point(data.cursor_position, Bias::Left)
 510            };
 511
 512            let mut scroll_anchor = data.scroll_anchor;
 513            if !buffer.can_resolve(&scroll_anchor.anchor) {
 514                scroll_anchor.anchor = buffer.anchor_before(
 515                    buffer.clip_point(Point::new(data.scroll_top_row, 0), Bias::Left),
 516                );
 517            }
 518
 519            drop(buffer);
 520
 521            if newest_selection.head() == offset {
 522                false
 523            } else {
 524                let nav_history = self.nav_history.take();
 525                self.set_scroll_anchor(scroll_anchor, cx);
 526                self.change_selections(Some(Autoscroll::fit()), cx, |s| {
 527                    s.select_ranges([offset..offset])
 528                });
 529                self.nav_history = nav_history;
 530                true
 531            }
 532        } else {
 533            false
 534        }
 535    }
 536
 537    fn tab_tooltip_text(&self, cx: &AppContext) -> Option<Cow<str>> {
 538        let file_path = self
 539            .buffer()
 540            .read(cx)
 541            .as_singleton()?
 542            .read(cx)
 543            .file()
 544            .and_then(|f| f.as_local())?
 545            .abs_path(cx);
 546
 547        let file_path = util::paths::compact(&file_path)
 548            .to_string_lossy()
 549            .to_string();
 550
 551        Some(file_path.into())
 552    }
 553
 554    fn tab_description<'a>(&'a self, detail: usize, cx: &'a AppContext) -> Option<Cow<str>> {
 555        match path_for_buffer(&self.buffer, detail, true, cx)? {
 556            Cow::Borrowed(path) => Some(path.to_string_lossy()),
 557            Cow::Owned(path) => Some(path.to_string_lossy().to_string().into()),
 558        }
 559    }
 560
 561    fn tab_content<T: View>(
 562        &self,
 563        detail: Option<usize>,
 564        style: &theme::Tab,
 565        cx: &AppContext,
 566    ) -> AnyElement<T> {
 567        Flex::row()
 568            .with_child(Label::new(self.title(cx).to_string(), style.label.clone()).into_any())
 569            .with_children(detail.and_then(|detail| {
 570                let path = path_for_buffer(&self.buffer, detail, false, cx)?;
 571                let description = path.to_string_lossy();
 572                Some(
 573                    Label::new(
 574                        util::truncate_and_trailoff(&description, MAX_TAB_TITLE_LEN),
 575                        style.description.text.clone(),
 576                    )
 577                    .contained()
 578                    .with_style(style.description.container)
 579                    .aligned(),
 580                )
 581            }))
 582            .align_children_center()
 583            .into_any()
 584    }
 585
 586    fn for_each_project_item(&self, cx: &AppContext, f: &mut dyn FnMut(usize, &dyn project::Item)) {
 587        self.buffer
 588            .read(cx)
 589            .for_each_buffer(|buffer| f(buffer.id(), buffer.read(cx)));
 590    }
 591
 592    fn is_singleton(&self, cx: &AppContext) -> bool {
 593        self.buffer.read(cx).is_singleton()
 594    }
 595
 596    fn clone_on_split(&self, _workspace_id: WorkspaceId, cx: &mut ViewContext<Self>) -> Option<Self>
 597    where
 598        Self: Sized,
 599    {
 600        Some(self.clone(cx))
 601    }
 602
 603    fn set_nav_history(&mut self, history: ItemNavHistory, _: &mut ViewContext<Self>) {
 604        self.nav_history = Some(history);
 605    }
 606
 607    fn deactivated(&mut self, cx: &mut ViewContext<Self>) {
 608        let selection = self.selections.newest_anchor();
 609        self.push_to_nav_history(selection.head(), None, cx);
 610    }
 611
 612    fn workspace_deactivated(&mut self, cx: &mut ViewContext<Self>) {
 613        hide_link_definition(self, cx);
 614        self.link_go_to_definition_state.last_mouse_location = None;
 615    }
 616
 617    fn is_dirty(&self, cx: &AppContext) -> bool {
 618        self.buffer().read(cx).read(cx).is_dirty()
 619    }
 620
 621    fn has_conflict(&self, cx: &AppContext) -> bool {
 622        self.buffer().read(cx).read(cx).has_conflict()
 623    }
 624
 625    fn can_save(&self, cx: &AppContext) -> bool {
 626        let buffer = &self.buffer().read(cx);
 627        if let Some(buffer) = buffer.as_singleton() {
 628            buffer.read(cx).project_path(cx).is_some()
 629        } else {
 630            true
 631        }
 632    }
 633
 634    fn save(
 635        &mut self,
 636        project: ModelHandle<Project>,
 637        cx: &mut ViewContext<Self>,
 638    ) -> Task<Result<()>> {
 639        self.report_editor_event("save", None, cx);
 640        let format = self.perform_format(project.clone(), FormatTrigger::Save, cx);
 641        let buffers = self.buffer().clone().read(cx).all_buffers();
 642        cx.spawn(|_, mut cx| async move {
 643            format.await?;
 644
 645            if buffers.len() == 1 {
 646                project
 647                    .update(&mut cx, |project, cx| project.save_buffers(buffers, cx))
 648                    .await?;
 649            } else {
 650                // For multi-buffers, only save those ones that contain changes. For clean buffers
 651                // we simulate saving by calling `Buffer::did_save`, so that language servers or
 652                // other downstream listeners of save events get notified.
 653                let (dirty_buffers, clean_buffers) = buffers.into_iter().partition(|buffer| {
 654                    buffer.read_with(&cx, |buffer, _| buffer.is_dirty() || buffer.has_conflict())
 655                });
 656
 657                project
 658                    .update(&mut cx, |project, cx| {
 659                        project.save_buffers(dirty_buffers, cx)
 660                    })
 661                    .await?;
 662                for buffer in clean_buffers {
 663                    buffer.update(&mut cx, |buffer, cx| {
 664                        let version = buffer.saved_version().clone();
 665                        let fingerprint = buffer.saved_version_fingerprint();
 666                        let mtime = buffer.saved_mtime();
 667                        buffer.did_save(version, fingerprint, mtime, cx);
 668                    });
 669                }
 670            }
 671
 672            Ok(())
 673        })
 674    }
 675
 676    fn save_as(
 677        &mut self,
 678        project: ModelHandle<Project>,
 679        abs_path: PathBuf,
 680        cx: &mut ViewContext<Self>,
 681    ) -> Task<Result<()>> {
 682        let buffer = self
 683            .buffer()
 684            .read(cx)
 685            .as_singleton()
 686            .expect("cannot call save_as on an excerpt list");
 687
 688        let file_extension = abs_path
 689            .extension()
 690            .map(|a| a.to_string_lossy().to_string());
 691        self.report_editor_event("save", file_extension, cx);
 692
 693        project.update(cx, |project, cx| {
 694            project.save_buffer_as(buffer, abs_path, cx)
 695        })
 696    }
 697
 698    fn reload(
 699        &mut self,
 700        project: ModelHandle<Project>,
 701        cx: &mut ViewContext<Self>,
 702    ) -> Task<Result<()>> {
 703        let buffer = self.buffer().clone();
 704        let buffers = self.buffer.read(cx).all_buffers();
 705        let reload_buffers =
 706            project.update(cx, |project, cx| project.reload_buffers(buffers, true, cx));
 707        cx.spawn(|this, mut cx| async move {
 708            let transaction = reload_buffers.log_err().await;
 709            this.update(&mut cx, |editor, cx| {
 710                editor.request_autoscroll(Autoscroll::fit(), cx)
 711            })?;
 712            buffer.update(&mut cx, |buffer, cx| {
 713                if let Some(transaction) = transaction {
 714                    if !buffer.is_singleton() {
 715                        buffer.push_transaction(&transaction.0, cx);
 716                    }
 717                }
 718            });
 719            Ok(())
 720        })
 721    }
 722
 723    fn to_item_events(event: &Self::Event) -> SmallVec<[ItemEvent; 2]> {
 724        let mut result = SmallVec::new();
 725        match event {
 726            Event::Closed => result.push(ItemEvent::CloseItem),
 727            Event::Saved | Event::TitleChanged => {
 728                result.push(ItemEvent::UpdateTab);
 729                result.push(ItemEvent::UpdateBreadcrumbs);
 730            }
 731            Event::Reparsed => {
 732                result.push(ItemEvent::UpdateBreadcrumbs);
 733            }
 734            Event::SelectionsChanged { local } if *local => {
 735                result.push(ItemEvent::UpdateBreadcrumbs);
 736            }
 737            Event::DirtyChanged => {
 738                result.push(ItemEvent::UpdateTab);
 739            }
 740            Event::BufferEdited => {
 741                result.push(ItemEvent::Edit);
 742                result.push(ItemEvent::UpdateBreadcrumbs);
 743            }
 744            _ => {}
 745        }
 746        result
 747    }
 748
 749    fn as_searchable(&self, handle: &ViewHandle<Self>) -> Option<Box<dyn SearchableItemHandle>> {
 750        Some(Box::new(handle.clone()))
 751    }
 752
 753    fn breadcrumb_location(&self) -> ToolbarItemLocation {
 754        ToolbarItemLocation::PrimaryLeft { flex: None }
 755    }
 756
 757    fn breadcrumbs(&self, theme: &theme::Theme, cx: &AppContext) -> Option<Vec<BreadcrumbText>> {
 758        let cursor = self.selections.newest_anchor().head();
 759        let multibuffer = &self.buffer().read(cx);
 760        let (buffer_id, symbols) =
 761            multibuffer.symbols_containing(cursor, Some(&theme.editor.syntax), cx)?;
 762        let buffer = multibuffer.buffer(buffer_id)?;
 763
 764        let buffer = buffer.read(cx);
 765        let filename = buffer
 766            .snapshot()
 767            .resolve_file_path(
 768                cx,
 769                self.project
 770                    .as_ref()
 771                    .map(|project| project.read(cx).visible_worktrees(cx).count() > 1)
 772                    .unwrap_or_default(),
 773            )
 774            .map(|path| path.to_string_lossy().to_string())
 775            .unwrap_or_else(|| "untitled".to_string());
 776
 777        let mut breadcrumbs = vec![BreadcrumbText {
 778            text: filename,
 779            highlights: None,
 780        }];
 781        breadcrumbs.extend(symbols.into_iter().map(|symbol| BreadcrumbText {
 782            text: symbol.text,
 783            highlights: Some(symbol.highlight_ranges),
 784        }));
 785        Some(breadcrumbs)
 786    }
 787
 788    fn added_to_workspace(&mut self, workspace: &mut Workspace, cx: &mut ViewContext<Self>) {
 789        let workspace_id = workspace.database_id();
 790        let item_id = cx.view_id();
 791        self.workspace = Some((workspace.weak_handle(), workspace.database_id()));
 792
 793        fn serialize(
 794            buffer: ModelHandle<Buffer>,
 795            workspace_id: WorkspaceId,
 796            item_id: ItemId,
 797            cx: &mut AppContext,
 798        ) {
 799            if let Some(file) = buffer.read(cx).file().and_then(|file| file.as_local()) {
 800                let path = file.abs_path(cx);
 801
 802                cx.background()
 803                    .spawn(async move {
 804                        DB.save_path(item_id, workspace_id, path.clone())
 805                            .await
 806                            .log_err()
 807                    })
 808                    .detach();
 809            }
 810        }
 811
 812        if let Some(buffer) = self.buffer().read(cx).as_singleton() {
 813            serialize(buffer.clone(), workspace_id, item_id, cx);
 814
 815            cx.subscribe(&buffer, |this, buffer, event, cx| {
 816                if let Some((_, workspace_id)) = this.workspace.as_ref() {
 817                    if let language::Event::FileHandleChanged = event {
 818                        serialize(buffer, *workspace_id, cx.view_id(), cx);
 819                    }
 820                }
 821            })
 822            .detach();
 823        }
 824    }
 825
 826    fn serialized_item_kind() -> Option<&'static str> {
 827        Some("Editor")
 828    }
 829
 830    fn deserialize(
 831        project: ModelHandle<Project>,
 832        _workspace: WeakViewHandle<Workspace>,
 833        workspace_id: workspace::WorkspaceId,
 834        item_id: ItemId,
 835        cx: &mut ViewContext<Pane>,
 836    ) -> Task<Result<ViewHandle<Self>>> {
 837        let project_item: Result<_> = project.update(cx, |project, cx| {
 838            // Look up the path with this key associated, create a self with that path
 839            let path = DB
 840                .get_path(item_id, workspace_id)?
 841                .context("No path stored for this editor")?;
 842
 843            let (worktree, path) = project
 844                .find_local_worktree(&path, cx)
 845                .with_context(|| format!("No worktree for path: {path:?}"))?;
 846            let project_path = ProjectPath {
 847                worktree_id: worktree.read(cx).id(),
 848                path: path.into(),
 849            };
 850
 851            Ok(project.open_path(project_path, cx))
 852        });
 853
 854        project_item
 855            .map(|project_item| {
 856                cx.spawn(|pane, mut cx| async move {
 857                    let (_, project_item) = project_item.await?;
 858                    let buffer = project_item
 859                        .downcast::<Buffer>()
 860                        .context("Project item at stored path was not a buffer")?;
 861                    Ok(pane.update(&mut cx, |_, cx| {
 862                        cx.add_view(|cx| {
 863                            let mut editor = Editor::for_buffer(buffer, Some(project), cx);
 864                            editor.read_scroll_position_from_db(item_id, workspace_id, cx);
 865                            editor
 866                        })
 867                    })?)
 868                })
 869            })
 870            .unwrap_or_else(|error| Task::ready(Err(error)))
 871    }
 872}
 873
 874impl ProjectItem for Editor {
 875    type Item = Buffer;
 876
 877    fn for_project_item(
 878        project: ModelHandle<Project>,
 879        buffer: ModelHandle<Buffer>,
 880        cx: &mut ViewContext<Self>,
 881    ) -> Self {
 882        Self::for_buffer(buffer, Some(project), cx)
 883    }
 884}
 885
 886enum BufferSearchHighlights {}
 887impl SearchableItem for Editor {
 888    type Match = Range<Anchor>;
 889
 890    fn to_search_event(event: &Self::Event) -> Option<SearchEvent> {
 891        match event {
 892            Event::BufferEdited => Some(SearchEvent::MatchesInvalidated),
 893            Event::SelectionsChanged { .. } => Some(SearchEvent::ActiveMatchChanged),
 894            _ => None,
 895        }
 896    }
 897
 898    fn clear_matches(&mut self, cx: &mut ViewContext<Self>) {
 899        self.clear_background_highlights::<BufferSearchHighlights>(cx);
 900    }
 901
 902    fn update_matches(&mut self, matches: Vec<Range<Anchor>>, cx: &mut ViewContext<Self>) {
 903        self.highlight_background::<BufferSearchHighlights>(
 904            matches,
 905            |theme| theme.search.match_background,
 906            cx,
 907        );
 908    }
 909
 910    fn query_suggestion(&mut self, cx: &mut ViewContext<Self>) -> String {
 911        let display_map = self.snapshot(cx).display_snapshot;
 912        let selection = self.selections.newest::<usize>(cx);
 913        if selection.start == selection.end {
 914            let point = selection.start.to_display_point(&display_map);
 915            let range = surrounding_word(&display_map, point);
 916            let range = range.start.to_offset(&display_map, Bias::Left)
 917                ..range.end.to_offset(&display_map, Bias::Right);
 918            let text: String = display_map.buffer_snapshot.text_for_range(range).collect();
 919            if text.trim().is_empty() {
 920                String::new()
 921            } else {
 922                text
 923            }
 924        } else {
 925            display_map
 926                .buffer_snapshot
 927                .text_for_range(selection.start..selection.end)
 928                .collect()
 929        }
 930    }
 931
 932    fn activate_match(
 933        &mut self,
 934        index: usize,
 935        matches: Vec<Range<Anchor>>,
 936        cx: &mut ViewContext<Self>,
 937    ) {
 938        self.unfold_ranges([matches[index].clone()], false, true, cx);
 939        let range = self.range_for_match(&matches[index]);
 940        self.change_selections(Some(Autoscroll::fit()), cx, |s| s.select_ranges([range]));
 941    }
 942
 943    fn match_index_for_direction(
 944        &mut self,
 945        matches: &Vec<Range<Anchor>>,
 946        mut current_index: usize,
 947        direction: Direction,
 948        cx: &mut ViewContext<Self>,
 949    ) -> usize {
 950        let buffer = self.buffer().read(cx).snapshot(cx);
 951        let cursor = self.selections.newest_anchor().head();
 952        if matches[current_index].start.cmp(&cursor, &buffer).is_gt() {
 953            if direction == Direction::Prev {
 954                if current_index == 0 {
 955                    current_index = matches.len() - 1;
 956                } else {
 957                    current_index -= 1;
 958                }
 959            }
 960        } else if matches[current_index].end.cmp(&cursor, &buffer).is_lt() {
 961            if direction == Direction::Next {
 962                current_index = 0;
 963            }
 964        } else if direction == Direction::Prev {
 965            if current_index == 0 {
 966                current_index = matches.len() - 1;
 967            } else {
 968                current_index -= 1;
 969            }
 970        } else if direction == Direction::Next {
 971            if current_index == matches.len() - 1 {
 972                current_index = 0
 973            } else {
 974                current_index += 1;
 975            }
 976        };
 977        current_index
 978    }
 979
 980    fn find_matches(
 981        &mut self,
 982        query: project::search::SearchQuery,
 983        cx: &mut ViewContext<Self>,
 984    ) -> Task<Vec<Range<Anchor>>> {
 985        let buffer = self.buffer().read(cx).snapshot(cx);
 986        cx.background().spawn(async move {
 987            let mut ranges = Vec::new();
 988            if let Some((_, _, excerpt_buffer)) = buffer.as_singleton() {
 989                ranges.extend(
 990                    query
 991                        .search(excerpt_buffer.as_rope())
 992                        .await
 993                        .into_iter()
 994                        .map(|range| {
 995                            buffer.anchor_after(range.start)..buffer.anchor_before(range.end)
 996                        }),
 997                );
 998            } else {
 999                for excerpt in buffer.excerpt_boundaries_in_range(0..buffer.len()) {
1000                    let excerpt_range = excerpt.range.context.to_offset(&excerpt.buffer);
1001                    let rope = excerpt.buffer.as_rope().slice(excerpt_range.clone());
1002                    ranges.extend(query.search(&rope).await.into_iter().map(|range| {
1003                        let start = excerpt
1004                            .buffer
1005                            .anchor_after(excerpt_range.start + range.start);
1006                        let end = excerpt
1007                            .buffer
1008                            .anchor_before(excerpt_range.start + range.end);
1009                        buffer.anchor_in_excerpt(excerpt.id.clone(), start)
1010                            ..buffer.anchor_in_excerpt(excerpt.id.clone(), end)
1011                    }));
1012                }
1013            }
1014            ranges
1015        })
1016    }
1017
1018    fn active_match_index(
1019        &mut self,
1020        matches: Vec<Range<Anchor>>,
1021        cx: &mut ViewContext<Self>,
1022    ) -> Option<usize> {
1023        active_match_index(
1024            &matches,
1025            &self.selections.newest_anchor().head(),
1026            &self.buffer().read(cx).snapshot(cx),
1027        )
1028    }
1029}
1030
1031pub fn active_match_index(
1032    ranges: &[Range<Anchor>],
1033    cursor: &Anchor,
1034    buffer: &MultiBufferSnapshot,
1035) -> Option<usize> {
1036    if ranges.is_empty() {
1037        None
1038    } else {
1039        match ranges.binary_search_by(|probe| {
1040            if probe.end.cmp(cursor, &*buffer).is_lt() {
1041                Ordering::Less
1042            } else if probe.start.cmp(cursor, &*buffer).is_gt() {
1043                Ordering::Greater
1044            } else {
1045                Ordering::Equal
1046            }
1047        }) {
1048            Ok(i) | Err(i) => Some(cmp::min(i, ranges.len() - 1)),
1049        }
1050    }
1051}
1052
1053pub struct CursorPosition {
1054    position: Option<Point>,
1055    selected_count: usize,
1056    _observe_active_editor: Option<Subscription>,
1057}
1058
1059impl Default for CursorPosition {
1060    fn default() -> Self {
1061        Self::new()
1062    }
1063}
1064
1065impl CursorPosition {
1066    pub fn new() -> Self {
1067        Self {
1068            position: None,
1069            selected_count: 0,
1070            _observe_active_editor: None,
1071        }
1072    }
1073
1074    fn update_position(&mut self, editor: ViewHandle<Editor>, cx: &mut ViewContext<Self>) {
1075        let editor = editor.read(cx);
1076        let buffer = editor.buffer().read(cx).snapshot(cx);
1077
1078        self.selected_count = 0;
1079        let mut last_selection: Option<Selection<usize>> = None;
1080        for selection in editor.selections.all::<usize>(cx) {
1081            self.selected_count += selection.end - selection.start;
1082            if last_selection
1083                .as_ref()
1084                .map_or(true, |last_selection| selection.id > last_selection.id)
1085            {
1086                last_selection = Some(selection);
1087            }
1088        }
1089        self.position = last_selection.map(|s| s.head().to_point(&buffer));
1090
1091        cx.notify();
1092    }
1093}
1094
1095impl Entity for CursorPosition {
1096    type Event = ();
1097}
1098
1099impl View for CursorPosition {
1100    fn ui_name() -> &'static str {
1101        "CursorPosition"
1102    }
1103
1104    fn render(&mut self, cx: &mut ViewContext<Self>) -> AnyElement<Self> {
1105        if let Some(position) = self.position {
1106            let theme = &theme::current(cx).workspace.status_bar;
1107            let mut text = format!(
1108                "{}{FILE_ROW_COLUMN_DELIMITER}{}",
1109                position.row + 1,
1110                position.column + 1
1111            );
1112            if self.selected_count > 0 {
1113                write!(text, " ({} selected)", self.selected_count).unwrap();
1114            }
1115            Label::new(text, theme.cursor_position.clone()).into_any()
1116        } else {
1117            Empty::new().into_any()
1118        }
1119    }
1120}
1121
1122impl StatusItemView for CursorPosition {
1123    fn set_active_pane_item(
1124        &mut self,
1125        active_pane_item: Option<&dyn ItemHandle>,
1126        cx: &mut ViewContext<Self>,
1127    ) {
1128        if let Some(editor) = active_pane_item.and_then(|item| item.act_as::<Editor>(cx)) {
1129            self._observe_active_editor = Some(cx.observe(&editor, Self::update_position));
1130            self.update_position(editor, cx);
1131        } else {
1132            self.position = None;
1133            self._observe_active_editor = None;
1134        }
1135
1136        cx.notify();
1137    }
1138}
1139
1140fn path_for_buffer<'a>(
1141    buffer: &ModelHandle<MultiBuffer>,
1142    height: usize,
1143    include_filename: bool,
1144    cx: &'a AppContext,
1145) -> Option<Cow<'a, Path>> {
1146    let file = buffer.read(cx).as_singleton()?.read(cx).file()?;
1147    path_for_file(file.as_ref(), height, include_filename, cx)
1148}
1149
1150fn path_for_file<'a>(
1151    file: &'a dyn language::File,
1152    mut height: usize,
1153    include_filename: bool,
1154    cx: &'a AppContext,
1155) -> Option<Cow<'a, Path>> {
1156    // Ensure we always render at least the filename.
1157    height += 1;
1158
1159    let mut prefix = file.path().as_ref();
1160    while height > 0 {
1161        if let Some(parent) = prefix.parent() {
1162            prefix = parent;
1163            height -= 1;
1164        } else {
1165            break;
1166        }
1167    }
1168
1169    // Here we could have just always used `full_path`, but that is very
1170    // allocation-heavy and so we try to use a `Cow<Path>` if we haven't
1171    // traversed all the way up to the worktree's root.
1172    if height > 0 {
1173        let full_path = file.full_path(cx);
1174        if include_filename {
1175            Some(full_path.into())
1176        } else {
1177            Some(full_path.parent()?.to_path_buf().into())
1178        }
1179    } else {
1180        let mut path = file.path().strip_prefix(prefix).ok()?;
1181        if !include_filename {
1182            path = path.parent()?;
1183        }
1184        Some(path.into())
1185    }
1186}
1187
1188#[cfg(test)]
1189mod tests {
1190    use super::*;
1191    use gpui::AppContext;
1192    use std::{
1193        path::{Path, PathBuf},
1194        sync::Arc,
1195        time::SystemTime,
1196    };
1197
1198    #[gpui::test]
1199    fn test_path_for_file(cx: &mut AppContext) {
1200        let file = TestFile {
1201            path: Path::new("").into(),
1202            full_path: PathBuf::from(""),
1203        };
1204        assert_eq!(path_for_file(&file, 0, false, cx), None);
1205    }
1206
1207    struct TestFile {
1208        path: Arc<Path>,
1209        full_path: PathBuf,
1210    }
1211
1212    impl language::File for TestFile {
1213        fn path(&self) -> &Arc<Path> {
1214            &self.path
1215        }
1216
1217        fn full_path(&self, _: &gpui::AppContext) -> PathBuf {
1218            self.full_path.clone()
1219        }
1220
1221        fn as_local(&self) -> Option<&dyn language::LocalFile> {
1222            unimplemented!()
1223        }
1224
1225        fn mtime(&self) -> SystemTime {
1226            unimplemented!()
1227        }
1228
1229        fn file_name<'a>(&'a self, _: &'a gpui::AppContext) -> &'a std::ffi::OsStr {
1230            unimplemented!()
1231        }
1232
1233        fn worktree_id(&self) -> usize {
1234            0
1235        }
1236
1237        fn is_deleted(&self) -> bool {
1238            unimplemented!()
1239        }
1240
1241        fn as_any(&self) -> &dyn std::any::Any {
1242            unimplemented!()
1243        }
1244
1245        fn to_proto(&self) -> rpc::proto::File {
1246            unimplemented!()
1247        }
1248    }
1249}