1use crate::{
   2    Anchor, Autoscroll, BufferSerialization, Capability, Editor, EditorEvent, EditorSettings,
   3    ExcerptId, ExcerptRange, FormatTarget, MultiBuffer, MultiBufferSnapshot, NavigationData,
   4    ReportEditorEvent, SearchWithinRange, SelectionEffects, ToPoint as _,
   5    display_map::HighlightKey,
   6    editor_settings::SeedQuerySetting,
   7    persistence::{DB, SerializedEditor},
   8    scroll::{ScrollAnchor, ScrollOffset},
   9};
  10use anyhow::{Context as _, Result, anyhow};
  11use collections::{HashMap, HashSet};
  12use file_icons::FileIcons;
  13use futures::future::try_join_all;
  14use git::status::GitSummary;
  15use gpui::{
  16    AnyElement, App, AsyncWindowContext, Context, Entity, EntityId, EventEmitter, IntoElement,
  17    ParentElement, Pixels, SharedString, Styled, Task, WeakEntity, Window, point,
  18};
  19use language::{
  20    Bias, Buffer, BufferRow, CharKind, CharScopeContext, DiskState, LocalFile, Point,
  21    SelectionGoal, proto::serialize_anchor as serialize_text_anchor,
  22};
  23use lsp::DiagnosticSeverity;
  24use multi_buffer::MultiBufferOffset;
  25use project::{
  26    File, Project, ProjectItem as _, ProjectPath, lsp_store::FormatTrigger,
  27    project_settings::ProjectSettings, search::SearchQuery,
  28};
  29use rpc::proto::{self, update_view};
  30use settings::Settings;
  31use std::{
  32    any::TypeId,
  33    borrow::Cow,
  34    cmp::{self, Ordering},
  35    iter,
  36    ops::Range,
  37    path::{Path, PathBuf},
  38    sync::Arc,
  39};
  40use text::{BufferId, BufferSnapshot, Selection};
  41use theme::{Theme, ThemeSettings};
  42use ui::{IconDecorationKind, prelude::*};
  43use util::{ResultExt, TryFutureExt, paths::PathExt};
  44use workspace::{
  45    CollaboratorId, ItemId, ItemNavHistory, ToolbarItemLocation, ViewId, Workspace, WorkspaceId,
  46    invalid_item_view::InvalidItemView,
  47    item::{FollowableItem, Item, ItemBufferKind, ItemEvent, ProjectItem, SaveOptions},
  48    searchable::{
  49        Direction, FilteredSearchRange, SearchEvent, SearchableItem, SearchableItemHandle,
  50    },
  51};
  52use workspace::{
  53    OpenOptions,
  54    item::{Dedup, ItemSettings, SerializableItem, TabContentParams},
  55};
  56use workspace::{
  57    OpenVisible, Pane, WorkspaceSettings,
  58    item::{BreadcrumbText, FollowEvent, ProjectItemKind},
  59    searchable::SearchOptions,
  60};
  61
  62pub const MAX_TAB_TITLE_LEN: usize = 24;
  63
  64impl FollowableItem for Editor {
  65    fn remote_id(&self) -> Option<ViewId> {
  66        self.remote_id
  67    }
  68
  69    fn from_state_proto(
  70        workspace: Entity<Workspace>,
  71        remote_id: ViewId,
  72        state: &mut Option<proto::view::Variant>,
  73        window: &mut Window,
  74        cx: &mut App,
  75    ) -> Option<Task<Result<Entity<Self>>>> {
  76        let project = workspace.read(cx).project().to_owned();
  77        let Some(proto::view::Variant::Editor(_)) = state else {
  78            return None;
  79        };
  80        let Some(proto::view::Variant::Editor(state)) = state.take() else {
  81            unreachable!()
  82        };
  83
  84        let buffer_ids = state
  85            .excerpts
  86            .iter()
  87            .map(|excerpt| excerpt.buffer_id)
  88            .collect::<HashSet<_>>();
  89        let buffers = project.update(cx, |project, cx| {
  90            buffer_ids
  91                .iter()
  92                .map(|id| BufferId::new(*id).map(|id| project.open_buffer_by_id(id, cx)))
  93                .collect::<Result<Vec<_>>>()
  94        });
  95
  96        Some(window.spawn(cx, async move |cx| {
  97            let mut buffers = futures::future::try_join_all(buffers?)
  98                .await
  99                .debug_assert_ok("leaders don't share views for unshared buffers")?;
 100
 101            let editor = cx.update(|window, cx| {
 102                let multibuffer = cx.new(|cx| {
 103                    let mut multibuffer;
 104                    if state.singleton && buffers.len() == 1 {
 105                        multibuffer = MultiBuffer::singleton(buffers.pop().unwrap(), cx)
 106                    } else {
 107                        multibuffer = MultiBuffer::new(project.read(cx).capability());
 108                        let mut sorted_excerpts = state.excerpts.clone();
 109                        sorted_excerpts.sort_by_key(|e| e.id);
 110                        let sorted_excerpts = sorted_excerpts.into_iter().peekable();
 111
 112                        for excerpt in sorted_excerpts {
 113                            let Ok(buffer_id) = BufferId::new(excerpt.buffer_id) else {
 114                                continue;
 115                            };
 116
 117                            let mut insert_position = ExcerptId::min();
 118                            for e in &state.excerpts {
 119                                if e.id == excerpt.id {
 120                                    break;
 121                                }
 122                                if e.id < excerpt.id {
 123                                    insert_position = ExcerptId::from_proto(e.id);
 124                                }
 125                            }
 126
 127                            let buffer =
 128                                buffers.iter().find(|b| b.read(cx).remote_id() == buffer_id);
 129
 130                            let Some(excerpt) = deserialize_excerpt_range(excerpt) else {
 131                                continue;
 132                            };
 133
 134                            let Some(buffer) = buffer else { continue };
 135
 136                            multibuffer.insert_excerpts_with_ids_after(
 137                                insert_position,
 138                                buffer.clone(),
 139                                [excerpt],
 140                                cx,
 141                            );
 142                        }
 143                    };
 144
 145                    if let Some(title) = &state.title {
 146                        multibuffer = multibuffer.with_title(title.clone())
 147                    }
 148
 149                    multibuffer
 150                });
 151
 152                cx.new(|cx| {
 153                    let mut editor =
 154                        Editor::for_multibuffer(multibuffer, Some(project.clone()), window, cx);
 155                    editor.remote_id = Some(remote_id);
 156                    editor
 157                })
 158            })?;
 159
 160            update_editor_from_message(
 161                editor.downgrade(),
 162                project,
 163                proto::update_view::Editor {
 164                    selections: state.selections,
 165                    pending_selection: state.pending_selection,
 166                    scroll_top_anchor: state.scroll_top_anchor,
 167                    scroll_x: state.scroll_x,
 168                    scroll_y: state.scroll_y,
 169                    ..Default::default()
 170                },
 171                cx,
 172            )
 173            .await?;
 174
 175            Ok(editor)
 176        }))
 177    }
 178
 179    fn set_leader_id(
 180        &mut self,
 181        leader_id: Option<CollaboratorId>,
 182        window: &mut Window,
 183        cx: &mut Context<Self>,
 184    ) {
 185        self.leader_id = leader_id;
 186        if self.leader_id.is_some() {
 187            self.buffer.update(cx, |buffer, cx| {
 188                buffer.remove_active_selections(cx);
 189            });
 190        } else if self.focus_handle.is_focused(window) {
 191            self.buffer.update(cx, |buffer, cx| {
 192                buffer.set_active_selections(
 193                    &self.selections.disjoint_anchors_arc(),
 194                    self.selections.line_mode(),
 195                    self.cursor_shape,
 196                    cx,
 197                );
 198            });
 199        }
 200        cx.notify();
 201    }
 202
 203    fn to_state_proto(&self, _: &Window, cx: &App) -> Option<proto::view::Variant> {
 204        let buffer = self.buffer.read(cx);
 205        if buffer
 206            .as_singleton()
 207            .and_then(|buffer| buffer.read(cx).file())
 208            .is_some_and(|file| file.is_private())
 209        {
 210            return None;
 211        }
 212
 213        let scroll_anchor = self.scroll_manager.anchor();
 214        let excerpts = buffer
 215            .read(cx)
 216            .excerpts()
 217            .map(|(id, buffer, range)| proto::Excerpt {
 218                id: id.to_proto(),
 219                buffer_id: buffer.remote_id().into(),
 220                context_start: Some(serialize_text_anchor(&range.context.start)),
 221                context_end: Some(serialize_text_anchor(&range.context.end)),
 222                primary_start: Some(serialize_text_anchor(&range.primary.start)),
 223                primary_end: Some(serialize_text_anchor(&range.primary.end)),
 224            })
 225            .collect();
 226        let snapshot = buffer.snapshot(cx);
 227
 228        Some(proto::view::Variant::Editor(proto::view::Editor {
 229            singleton: buffer.is_singleton(),
 230            title: buffer.explicit_title().map(ToOwned::to_owned),
 231            excerpts,
 232            scroll_top_anchor: Some(serialize_anchor(&scroll_anchor.anchor, &snapshot)),
 233            scroll_x: scroll_anchor.offset.x,
 234            scroll_y: scroll_anchor.offset.y,
 235            selections: self
 236                .selections
 237                .disjoint_anchors_arc()
 238                .iter()
 239                .map(|s| serialize_selection(s, &snapshot))
 240                .collect(),
 241            pending_selection: self
 242                .selections
 243                .pending_anchor()
 244                .as_ref()
 245                .map(|s| serialize_selection(s, &snapshot)),
 246        }))
 247    }
 248
 249    fn to_follow_event(event: &EditorEvent) -> Option<workspace::item::FollowEvent> {
 250        match event {
 251            EditorEvent::Edited { .. } => Some(FollowEvent::Unfollow),
 252            EditorEvent::SelectionsChanged { local }
 253            | EditorEvent::ScrollPositionChanged { local, .. } => {
 254                if *local {
 255                    Some(FollowEvent::Unfollow)
 256                } else {
 257                    None
 258                }
 259            }
 260            _ => None,
 261        }
 262    }
 263
 264    fn add_event_to_update_proto(
 265        &self,
 266        event: &EditorEvent,
 267        update: &mut Option<proto::update_view::Variant>,
 268        _: &Window,
 269        cx: &App,
 270    ) -> bool {
 271        let update =
 272            update.get_or_insert_with(|| proto::update_view::Variant::Editor(Default::default()));
 273
 274        match update {
 275            proto::update_view::Variant::Editor(update) => match event {
 276                EditorEvent::ExcerptsAdded {
 277                    buffer,
 278                    predecessor,
 279                    excerpts,
 280                } => {
 281                    let buffer_id = buffer.read(cx).remote_id();
 282                    let mut excerpts = excerpts.iter();
 283                    if let Some((id, range)) = excerpts.next() {
 284                        update.inserted_excerpts.push(proto::ExcerptInsertion {
 285                            previous_excerpt_id: Some(predecessor.to_proto()),
 286                            excerpt: serialize_excerpt(buffer_id, id, range),
 287                        });
 288                        update.inserted_excerpts.extend(excerpts.map(|(id, range)| {
 289                            proto::ExcerptInsertion {
 290                                previous_excerpt_id: None,
 291                                excerpt: serialize_excerpt(buffer_id, id, range),
 292                            }
 293                        }))
 294                    }
 295                    true
 296                }
 297                EditorEvent::ExcerptsRemoved { ids, .. } => {
 298                    update
 299                        .deleted_excerpts
 300                        .extend(ids.iter().copied().map(ExcerptId::to_proto));
 301                    true
 302                }
 303                EditorEvent::ScrollPositionChanged { autoscroll, .. } if !autoscroll => {
 304                    let snapshot = self.buffer.read(cx).snapshot(cx);
 305                    let scroll_anchor = self.scroll_manager.anchor();
 306                    update.scroll_top_anchor =
 307                        Some(serialize_anchor(&scroll_anchor.anchor, &snapshot));
 308                    update.scroll_x = scroll_anchor.offset.x;
 309                    update.scroll_y = scroll_anchor.offset.y;
 310                    true
 311                }
 312                EditorEvent::SelectionsChanged { .. } => {
 313                    let snapshot = self.buffer.read(cx).snapshot(cx);
 314                    update.selections = self
 315                        .selections
 316                        .disjoint_anchors_arc()
 317                        .iter()
 318                        .map(|s| serialize_selection(s, &snapshot))
 319                        .collect();
 320                    update.pending_selection = self
 321                        .selections
 322                        .pending_anchor()
 323                        .as_ref()
 324                        .map(|s| serialize_selection(s, &snapshot));
 325                    true
 326                }
 327                _ => false,
 328            },
 329        }
 330    }
 331
 332    fn apply_update_proto(
 333        &mut self,
 334        project: &Entity<Project>,
 335        message: update_view::Variant,
 336        window: &mut Window,
 337        cx: &mut Context<Self>,
 338    ) -> Task<Result<()>> {
 339        let update_view::Variant::Editor(message) = message;
 340        let project = project.clone();
 341        cx.spawn_in(window, async move |this, cx| {
 342            update_editor_from_message(this, project, message, cx).await
 343        })
 344    }
 345
 346    fn is_project_item(&self, _window: &Window, _cx: &App) -> bool {
 347        true
 348    }
 349
 350    fn dedup(&self, existing: &Self, _: &Window, cx: &App) -> Option<Dedup> {
 351        let self_singleton = self.buffer.read(cx).as_singleton()?;
 352        let other_singleton = existing.buffer.read(cx).as_singleton()?;
 353        if self_singleton == other_singleton {
 354            Some(Dedup::KeepExisting)
 355        } else {
 356            None
 357        }
 358    }
 359
 360    fn update_agent_location(
 361        &mut self,
 362        location: language::Anchor,
 363        window: &mut Window,
 364        cx: &mut Context<Self>,
 365    ) {
 366        let buffer = self.buffer.read(cx);
 367        let buffer = buffer.read(cx);
 368        let Some(position) = buffer.as_singleton_anchor(location) else {
 369            return;
 370        };
 371        let selection = Selection {
 372            id: 0,
 373            reversed: false,
 374            start: position,
 375            end: position,
 376            goal: SelectionGoal::None,
 377        };
 378        drop(buffer);
 379        self.set_selections_from_remote(vec![selection], None, window, cx);
 380        self.request_autoscroll_remotely(Autoscroll::fit(), cx);
 381    }
 382}
 383
 384async fn update_editor_from_message(
 385    this: WeakEntity<Editor>,
 386    project: Entity<Project>,
 387    message: proto::update_view::Editor,
 388    cx: &mut AsyncWindowContext,
 389) -> Result<()> {
 390    // Open all of the buffers of which excerpts were added to the editor.
 391    let inserted_excerpt_buffer_ids = message
 392        .inserted_excerpts
 393        .iter()
 394        .filter_map(|insertion| Some(insertion.excerpt.as_ref()?.buffer_id))
 395        .collect::<HashSet<_>>();
 396    let inserted_excerpt_buffers = project.update(cx, |project, cx| {
 397        inserted_excerpt_buffer_ids
 398            .into_iter()
 399            .map(|id| BufferId::new(id).map(|id| project.open_buffer_by_id(id, cx)))
 400            .collect::<Result<Vec<_>>>()
 401    })??;
 402    let _inserted_excerpt_buffers = try_join_all(inserted_excerpt_buffers).await?;
 403
 404    // Update the editor's excerpts.
 405    this.update(cx, |editor, cx| {
 406        editor.buffer.update(cx, |multibuffer, cx| {
 407            let mut removed_excerpt_ids = message
 408                .deleted_excerpts
 409                .into_iter()
 410                .map(ExcerptId::from_proto)
 411                .collect::<Vec<_>>();
 412            removed_excerpt_ids.sort_by({
 413                let multibuffer = multibuffer.read(cx);
 414                move |a, b| a.cmp(b, &multibuffer)
 415            });
 416
 417            let mut insertions = message.inserted_excerpts.into_iter().peekable();
 418            while let Some(insertion) = insertions.next() {
 419                let Some(excerpt) = insertion.excerpt else {
 420                    continue;
 421                };
 422                let Some(previous_excerpt_id) = insertion.previous_excerpt_id else {
 423                    continue;
 424                };
 425                let buffer_id = BufferId::new(excerpt.buffer_id)?;
 426                let Some(buffer) = project.read(cx).buffer_for_id(buffer_id, cx) else {
 427                    continue;
 428                };
 429
 430                let adjacent_excerpts = iter::from_fn(|| {
 431                    let insertion = insertions.peek()?;
 432                    if insertion.previous_excerpt_id.is_none()
 433                        && insertion.excerpt.as_ref()?.buffer_id == u64::from(buffer_id)
 434                    {
 435                        insertions.next()?.excerpt
 436                    } else {
 437                        None
 438                    }
 439                });
 440
 441                multibuffer.insert_excerpts_with_ids_after(
 442                    ExcerptId::from_proto(previous_excerpt_id),
 443                    buffer,
 444                    [excerpt]
 445                        .into_iter()
 446                        .chain(adjacent_excerpts)
 447                        .filter_map(deserialize_excerpt_range),
 448                    cx,
 449                );
 450            }
 451
 452            multibuffer.remove_excerpts(removed_excerpt_ids, cx);
 453            anyhow::Ok(())
 454        })
 455    })??;
 456
 457    // Deserialize the editor state.
 458    let selections = message
 459        .selections
 460        .into_iter()
 461        .filter_map(deserialize_selection)
 462        .collect::<Vec<_>>();
 463    let pending_selection = message.pending_selection.and_then(deserialize_selection);
 464    let scroll_top_anchor = message.scroll_top_anchor.and_then(deserialize_anchor);
 465
 466    // Wait until the buffer has received all of the operations referenced by
 467    // the editor's new state.
 468    this.update(cx, |editor, cx| {
 469        editor.buffer.update(cx, |buffer, cx| {
 470            buffer.wait_for_anchors(
 471                selections
 472                    .iter()
 473                    .chain(pending_selection.as_ref())
 474                    .flat_map(|selection| [selection.start, selection.end])
 475                    .chain(scroll_top_anchor),
 476                cx,
 477            )
 478        })
 479    })?
 480    .await?;
 481
 482    // Update the editor's state.
 483    this.update_in(cx, |editor, window, cx| {
 484        if !selections.is_empty() || pending_selection.is_some() {
 485            editor.set_selections_from_remote(selections, pending_selection, window, cx);
 486            editor.request_autoscroll_remotely(Autoscroll::newest(), cx);
 487        } else if let Some(scroll_top_anchor) = scroll_top_anchor {
 488            editor.set_scroll_anchor_remote(
 489                ScrollAnchor {
 490                    anchor: scroll_top_anchor,
 491                    offset: point(message.scroll_x, message.scroll_y),
 492                },
 493                window,
 494                cx,
 495            );
 496        }
 497    })?;
 498    Ok(())
 499}
 500
 501fn serialize_excerpt(
 502    buffer_id: BufferId,
 503    id: &ExcerptId,
 504    range: &ExcerptRange<language::Anchor>,
 505) -> Option<proto::Excerpt> {
 506    Some(proto::Excerpt {
 507        id: id.to_proto(),
 508        buffer_id: buffer_id.into(),
 509        context_start: Some(serialize_text_anchor(&range.context.start)),
 510        context_end: Some(serialize_text_anchor(&range.context.end)),
 511        primary_start: Some(serialize_text_anchor(&range.primary.start)),
 512        primary_end: Some(serialize_text_anchor(&range.primary.end)),
 513    })
 514}
 515
 516fn serialize_selection(
 517    selection: &Selection<Anchor>,
 518    buffer: &MultiBufferSnapshot,
 519) -> proto::Selection {
 520    proto::Selection {
 521        id: selection.id as u64,
 522        start: Some(serialize_anchor(&selection.start, buffer)),
 523        end: Some(serialize_anchor(&selection.end, buffer)),
 524        reversed: selection.reversed,
 525    }
 526}
 527
 528fn serialize_anchor(anchor: &Anchor, buffer: &MultiBufferSnapshot) -> proto::EditorAnchor {
 529    proto::EditorAnchor {
 530        excerpt_id: buffer.latest_excerpt_id(anchor.excerpt_id).to_proto(),
 531        anchor: Some(serialize_text_anchor(&anchor.text_anchor)),
 532    }
 533}
 534
 535fn deserialize_excerpt_range(
 536    excerpt: proto::Excerpt,
 537) -> Option<(ExcerptId, ExcerptRange<language::Anchor>)> {
 538    let context = {
 539        let start = language::proto::deserialize_anchor(excerpt.context_start?)?;
 540        let end = language::proto::deserialize_anchor(excerpt.context_end?)?;
 541        start..end
 542    };
 543    let primary = excerpt
 544        .primary_start
 545        .zip(excerpt.primary_end)
 546        .and_then(|(start, end)| {
 547            let start = language::proto::deserialize_anchor(start)?;
 548            let end = language::proto::deserialize_anchor(end)?;
 549            Some(start..end)
 550        })
 551        .unwrap_or_else(|| context.clone());
 552    Some((
 553        ExcerptId::from_proto(excerpt.id),
 554        ExcerptRange { context, primary },
 555    ))
 556}
 557
 558fn deserialize_selection(selection: proto::Selection) -> Option<Selection<Anchor>> {
 559    Some(Selection {
 560        id: selection.id as usize,
 561        start: deserialize_anchor(selection.start?)?,
 562        end: deserialize_anchor(selection.end?)?,
 563        reversed: selection.reversed,
 564        goal: SelectionGoal::None,
 565    })
 566}
 567
 568fn deserialize_anchor(anchor: proto::EditorAnchor) -> Option<Anchor> {
 569    let excerpt_id = ExcerptId::from_proto(anchor.excerpt_id);
 570    Some(Anchor::in_buffer(
 571        excerpt_id,
 572        language::proto::deserialize_anchor(anchor.anchor?)?,
 573    ))
 574}
 575
 576impl Item for Editor {
 577    type Event = EditorEvent;
 578
 579    fn act_as_type<'a>(
 580        &'a self,
 581        type_id: TypeId,
 582        self_handle: &'a Entity<Self>,
 583        cx: &'a App,
 584    ) -> Option<gpui::AnyEntity> {
 585        if TypeId::of::<Self>() == type_id {
 586            Some(self_handle.clone().into())
 587        } else if TypeId::of::<MultiBuffer>() == type_id {
 588            Some(self_handle.read(cx).buffer.clone().into())
 589        } else {
 590            None
 591        }
 592    }
 593
 594    fn navigate(
 595        &mut self,
 596        data: Box<dyn std::any::Any>,
 597        window: &mut Window,
 598        cx: &mut Context<Self>,
 599    ) -> bool {
 600        if let Ok(data) = data.downcast::<NavigationData>() {
 601            let newest_selection = self.selections.newest::<Point>(&self.display_snapshot(cx));
 602            let buffer = self.buffer.read(cx).read(cx);
 603            let offset = if buffer.can_resolve(&data.cursor_anchor) {
 604                data.cursor_anchor.to_point(&buffer)
 605            } else {
 606                buffer.clip_point(data.cursor_position, Bias::Left)
 607            };
 608
 609            let mut scroll_anchor = data.scroll_anchor;
 610            if !buffer.can_resolve(&scroll_anchor.anchor) {
 611                scroll_anchor.anchor = buffer.anchor_before(
 612                    buffer.clip_point(Point::new(data.scroll_top_row, 0), Bias::Left),
 613                );
 614            }
 615
 616            drop(buffer);
 617
 618            if newest_selection.head() == offset {
 619                false
 620            } else {
 621                self.set_scroll_anchor(scroll_anchor, window, cx);
 622                self.change_selections(
 623                    SelectionEffects::default().nav_history(false),
 624                    window,
 625                    cx,
 626                    |s| s.select_ranges([offset..offset]),
 627                );
 628                true
 629            }
 630        } else {
 631            false
 632        }
 633    }
 634
 635    fn tab_tooltip_text(&self, cx: &App) -> Option<SharedString> {
 636        self.buffer()
 637            .read(cx)
 638            .as_singleton()
 639            .and_then(|buffer| buffer.read(cx).file())
 640            .and_then(|file| File::from_dyn(Some(file)))
 641            .map(|file| {
 642                file.worktree
 643                    .read(cx)
 644                    .absolutize(&file.path)
 645                    .compact()
 646                    .to_string_lossy()
 647                    .into_owned()
 648                    .into()
 649            })
 650    }
 651
 652    fn telemetry_event_text(&self) -> Option<&'static str> {
 653        None
 654    }
 655
 656    fn tab_content_text(&self, detail: usize, cx: &App) -> SharedString {
 657        if let Some(path) = path_for_buffer(&self.buffer, detail, true, cx) {
 658            path.to_string().into()
 659        } else {
 660            // Use the same logic as the displayed title for consistency
 661            self.buffer.read(cx).title(cx).to_string().into()
 662        }
 663    }
 664
 665    fn suggested_filename(&self, cx: &App) -> SharedString {
 666        self.buffer.read(cx).title(cx).to_string().into()
 667    }
 668
 669    fn tab_icon(&self, _: &Window, cx: &App) -> Option<Icon> {
 670        ItemSettings::get_global(cx)
 671            .file_icons
 672            .then(|| {
 673                path_for_buffer(&self.buffer, 0, true, cx)
 674                    .and_then(|path| FileIcons::get_icon(Path::new(&*path), cx))
 675            })
 676            .flatten()
 677            .map(Icon::from_path)
 678    }
 679
 680    fn tab_content(&self, params: TabContentParams, _: &Window, cx: &App) -> AnyElement {
 681        let label_color = if ItemSettings::get_global(cx).git_status {
 682            self.buffer()
 683                .read(cx)
 684                .as_singleton()
 685                .and_then(|buffer| {
 686                    let buffer = buffer.read(cx);
 687                    let path = buffer.project_path(cx)?;
 688                    let buffer_id = buffer.remote_id();
 689                    let project = self.project()?.read(cx);
 690                    let entry = project.entry_for_path(&path, cx)?;
 691                    let (repo, repo_path) = project
 692                        .git_store()
 693                        .read(cx)
 694                        .repository_and_path_for_buffer_id(buffer_id, cx)?;
 695                    let status = repo.read(cx).status_for_path(&repo_path)?.status;
 696
 697                    Some(entry_git_aware_label_color(
 698                        status.summary(),
 699                        entry.is_ignored,
 700                        params.selected,
 701                    ))
 702                })
 703                .unwrap_or_else(|| entry_label_color(params.selected))
 704        } else {
 705            entry_label_color(params.selected)
 706        };
 707
 708        let description = params.detail.and_then(|detail| {
 709            let path = path_for_buffer(&self.buffer, detail, false, cx)?;
 710            let description = path.trim();
 711
 712            if description.is_empty() {
 713                return None;
 714            }
 715
 716            Some(util::truncate_and_trailoff(description, MAX_TAB_TITLE_LEN))
 717        });
 718
 719        // Whether the file was saved in the past but is now deleted.
 720        let was_deleted: bool = self
 721            .buffer()
 722            .read(cx)
 723            .as_singleton()
 724            .and_then(|buffer| buffer.read(cx).file())
 725            .is_some_and(|file| file.disk_state() == DiskState::Deleted);
 726
 727        h_flex()
 728            .gap_2()
 729            .child(
 730                Label::new(self.title(cx).to_string())
 731                    .color(label_color)
 732                    .when(params.preview, |this| this.italic())
 733                    .when(was_deleted, |this| this.strikethrough()),
 734            )
 735            .when_some(description, |this, description| {
 736                this.child(
 737                    Label::new(description)
 738                        .size(LabelSize::XSmall)
 739                        .color(Color::Muted),
 740                )
 741            })
 742            .into_any_element()
 743    }
 744
 745    fn for_each_project_item(
 746        &self,
 747        cx: &App,
 748        f: &mut dyn FnMut(EntityId, &dyn project::ProjectItem),
 749    ) {
 750        self.buffer
 751            .read(cx)
 752            .for_each_buffer(|buffer| f(buffer.entity_id(), buffer.read(cx)));
 753    }
 754
 755    fn buffer_kind(&self, cx: &App) -> ItemBufferKind {
 756        match self.buffer.read(cx).is_singleton() {
 757            true => ItemBufferKind::Singleton,
 758            false => ItemBufferKind::Multibuffer,
 759        }
 760    }
 761
 762    fn can_save_as(&self, cx: &App) -> bool {
 763        self.buffer.read(cx).is_singleton()
 764    }
 765
 766    fn can_split(&self) -> bool {
 767        true
 768    }
 769
 770    fn clone_on_split(
 771        &self,
 772        _workspace_id: Option<WorkspaceId>,
 773        window: &mut Window,
 774        cx: &mut Context<Self>,
 775    ) -> Task<Option<Entity<Editor>>>
 776    where
 777        Self: Sized,
 778    {
 779        Task::ready(Some(cx.new(|cx| self.clone(window, cx))))
 780    }
 781
 782    fn set_nav_history(
 783        &mut self,
 784        history: ItemNavHistory,
 785        _window: &mut Window,
 786        _: &mut Context<Self>,
 787    ) {
 788        self.nav_history = Some(history);
 789    }
 790
 791    fn on_removed(&self, cx: &App) {
 792        self.report_editor_event(ReportEditorEvent::Closed, None, cx);
 793    }
 794
 795    fn deactivated(&mut self, _: &mut Window, cx: &mut Context<Self>) {
 796        let selection = self.selections.newest_anchor();
 797        self.push_to_nav_history(selection.head(), None, true, false, cx);
 798    }
 799
 800    fn workspace_deactivated(&mut self, _: &mut Window, cx: &mut Context<Self>) {
 801        self.hide_hovered_link(cx);
 802    }
 803
 804    fn is_dirty(&self, cx: &App) -> bool {
 805        self.buffer().read(cx).read(cx).is_dirty()
 806    }
 807
 808    fn is_read_only(&self, cx: &App) -> bool {
 809        self.read_only(cx)
 810    }
 811
 812    // Note: this mirrors the logic in `Editor::toggle_read_only`, but is reachable
 813    // without relying on focus-based action dispatch.
 814    fn toggle_read_only(&mut self, window: &mut Window, cx: &mut Context<Self>) {
 815        if let Some(buffer) = self.buffer.read(cx).as_singleton() {
 816            buffer.update(cx, |buffer, cx| {
 817                buffer.set_capability(
 818                    match buffer.capability() {
 819                        Capability::ReadWrite => Capability::Read,
 820                        Capability::Read => Capability::ReadWrite,
 821                        Capability::ReadOnly => Capability::ReadOnly,
 822                    },
 823                    cx,
 824                );
 825            });
 826        }
 827        cx.notify();
 828        window.refresh();
 829    }
 830
 831    fn has_deleted_file(&self, cx: &App) -> bool {
 832        self.buffer().read(cx).read(cx).has_deleted_file()
 833    }
 834
 835    fn has_conflict(&self, cx: &App) -> bool {
 836        self.buffer().read(cx).read(cx).has_conflict()
 837    }
 838
 839    fn can_save(&self, cx: &App) -> bool {
 840        let buffer = &self.buffer().read(cx);
 841        if let Some(buffer) = buffer.as_singleton() {
 842            buffer.read(cx).project_path(cx).is_some()
 843        } else {
 844            true
 845        }
 846    }
 847
 848    fn save(
 849        &mut self,
 850        options: SaveOptions,
 851        project: Entity<Project>,
 852        window: &mut Window,
 853        cx: &mut Context<Self>,
 854    ) -> Task<Result<()>> {
 855        // Add meta data tracking # of auto saves
 856        if options.autosave {
 857            self.report_editor_event(ReportEditorEvent::Saved { auto_saved: true }, None, cx);
 858        } else {
 859            self.report_editor_event(ReportEditorEvent::Saved { auto_saved: false }, None, cx);
 860        }
 861
 862        let buffers = self.buffer().clone().read(cx).all_buffers();
 863        let buffers = buffers
 864            .into_iter()
 865            .map(|handle| handle.read(cx).base_buffer().unwrap_or(handle.clone()))
 866            .collect::<HashSet<_>>();
 867
 868        let buffers_to_save = if self.buffer.read(cx).is_singleton() && !options.autosave {
 869            buffers
 870        } else {
 871            buffers
 872                .into_iter()
 873                .filter(|buffer| buffer.read(cx).is_dirty())
 874                .collect()
 875        };
 876
 877        cx.spawn_in(window, async move |this, cx| {
 878            if options.format {
 879                this.update_in(cx, |editor, window, cx| {
 880                    editor.perform_format(
 881                        project.clone(),
 882                        FormatTrigger::Save,
 883                        FormatTarget::Buffers(buffers_to_save.clone()),
 884                        window,
 885                        cx,
 886                    )
 887                })?
 888                .await?;
 889            }
 890
 891            if !buffers_to_save.is_empty() {
 892                project
 893                    .update(cx, |project, cx| {
 894                        project.save_buffers(buffers_to_save.clone(), cx)
 895                    })?
 896                    .await?;
 897            }
 898
 899            Ok(())
 900        })
 901    }
 902
 903    fn save_as(
 904        &mut self,
 905        project: Entity<Project>,
 906        path: ProjectPath,
 907        _: &mut Window,
 908        cx: &mut Context<Self>,
 909    ) -> Task<Result<()>> {
 910        let buffer = self
 911            .buffer()
 912            .read(cx)
 913            .as_singleton()
 914            .expect("cannot call save_as on an excerpt list");
 915
 916        let file_extension = path.path.extension().map(|a| a.to_string());
 917        self.report_editor_event(
 918            ReportEditorEvent::Saved { auto_saved: false },
 919            file_extension,
 920            cx,
 921        );
 922
 923        project.update(cx, |project, cx| project.save_buffer_as(buffer, path, cx))
 924    }
 925
 926    fn reload(
 927        &mut self,
 928        project: Entity<Project>,
 929        window: &mut Window,
 930        cx: &mut Context<Self>,
 931    ) -> Task<Result<()>> {
 932        let buffer = self.buffer().clone();
 933        let buffers = self.buffer.read(cx).all_buffers();
 934        let reload_buffers =
 935            project.update(cx, |project, cx| project.reload_buffers(buffers, true, cx));
 936        cx.spawn_in(window, async move |this, cx| {
 937            let transaction = reload_buffers.log_err().await;
 938            this.update(cx, |editor, cx| {
 939                editor.request_autoscroll(Autoscroll::fit(), cx)
 940            })?;
 941            buffer
 942                .update(cx, |buffer, cx| {
 943                    if let Some(transaction) = transaction
 944                        && !buffer.is_singleton()
 945                    {
 946                        buffer.push_transaction(&transaction.0, cx);
 947                    }
 948                })
 949                .ok();
 950            Ok(())
 951        })
 952    }
 953
 954    fn as_searchable(
 955        &self,
 956        handle: &Entity<Self>,
 957        _: &App,
 958    ) -> Option<Box<dyn SearchableItemHandle>> {
 959        Some(Box::new(handle.clone()))
 960    }
 961
 962    fn pixel_position_of_cursor(&self, _: &App) -> Option<gpui::Point<Pixels>> {
 963        self.pixel_position_of_newest_cursor
 964    }
 965
 966    fn breadcrumb_location(&self, _: &App) -> ToolbarItemLocation {
 967        if self.show_breadcrumbs {
 968            ToolbarItemLocation::PrimaryLeft
 969        } else {
 970            ToolbarItemLocation::Hidden
 971        }
 972    }
 973
 974    fn breadcrumbs(&self, variant: &Theme, cx: &App) -> Option<Vec<BreadcrumbText>> {
 975        let cursor = self.selections.newest_anchor().head();
 976        let multibuffer = self.buffer().read(cx);
 977        let (buffer_id, symbols) = multibuffer
 978            .read(cx)
 979            .symbols_containing(cursor, Some(variant.syntax()))?;
 980        let buffer = multibuffer.buffer(buffer_id)?;
 981
 982        let buffer = buffer.read(cx);
 983        let text = self.breadcrumb_header.clone().unwrap_or_else(|| {
 984            buffer
 985                .snapshot()
 986                .resolve_file_path(
 987                    self.project
 988                        .as_ref()
 989                        .map(|project| project.read(cx).visible_worktrees(cx).count() > 1)
 990                        .unwrap_or_default(),
 991                    cx,
 992                )
 993                .unwrap_or_else(|| {
 994                    if multibuffer.is_singleton() {
 995                        multibuffer.title(cx).to_string()
 996                    } else {
 997                        "untitled".to_string()
 998                    }
 999                })
1000        });
1001
1002        let settings = ThemeSettings::get_global(cx);
1003
1004        let mut breadcrumbs = vec![BreadcrumbText {
1005            text,
1006            highlights: None,
1007            font: Some(settings.buffer_font.clone()),
1008        }];
1009
1010        breadcrumbs.extend(symbols.into_iter().map(|symbol| BreadcrumbText {
1011            text: symbol.text,
1012            highlights: Some(symbol.highlight_ranges),
1013            font: Some(settings.buffer_font.clone()),
1014        }));
1015        Some(breadcrumbs)
1016    }
1017
1018    fn added_to_workspace(
1019        &mut self,
1020        workspace: &mut Workspace,
1021        _window: &mut Window,
1022        cx: &mut Context<Self>,
1023    ) {
1024        self.workspace = Some((workspace.weak_handle(), workspace.database_id()));
1025        if let Some(workspace) = &workspace.weak_handle().upgrade() {
1026            cx.subscribe(workspace, |editor, _, event: &workspace::Event, _cx| {
1027                if let workspace::Event::ModalOpened = event {
1028                    editor.mouse_context_menu.take();
1029                    editor.inline_blame_popover.take();
1030                }
1031            })
1032            .detach();
1033        }
1034    }
1035
1036    fn to_item_events(event: &EditorEvent, mut f: impl FnMut(ItemEvent)) {
1037        match event {
1038            EditorEvent::Saved | EditorEvent::TitleChanged => {
1039                f(ItemEvent::UpdateTab);
1040                f(ItemEvent::UpdateBreadcrumbs);
1041            }
1042
1043            EditorEvent::Reparsed(_) => {
1044                f(ItemEvent::UpdateBreadcrumbs);
1045            }
1046
1047            EditorEvent::SelectionsChanged { local } if *local => {
1048                f(ItemEvent::UpdateBreadcrumbs);
1049            }
1050
1051            EditorEvent::BreadcrumbsChanged => {
1052                f(ItemEvent::UpdateBreadcrumbs);
1053            }
1054
1055            EditorEvent::DirtyChanged => {
1056                f(ItemEvent::UpdateTab);
1057            }
1058
1059            EditorEvent::BufferEdited => {
1060                f(ItemEvent::Edit);
1061                f(ItemEvent::UpdateBreadcrumbs);
1062            }
1063
1064            EditorEvent::ExcerptsAdded { .. } | EditorEvent::ExcerptsRemoved { .. } => {
1065                f(ItemEvent::Edit);
1066            }
1067
1068            _ => {}
1069        }
1070    }
1071
1072    fn preserve_preview(&self, cx: &App) -> bool {
1073        self.buffer.read(cx).preserve_preview(cx)
1074    }
1075}
1076
1077impl SerializableItem for Editor {
1078    fn serialized_item_kind() -> &'static str {
1079        "Editor"
1080    }
1081
1082    fn cleanup(
1083        workspace_id: WorkspaceId,
1084        alive_items: Vec<ItemId>,
1085        _window: &mut Window,
1086        cx: &mut App,
1087    ) -> Task<Result<()>> {
1088        workspace::delete_unloaded_items(alive_items, workspace_id, "editors", &DB, cx)
1089    }
1090
1091    fn deserialize(
1092        project: Entity<Project>,
1093        workspace: WeakEntity<Workspace>,
1094        workspace_id: workspace::WorkspaceId,
1095        item_id: ItemId,
1096        window: &mut Window,
1097        cx: &mut App,
1098    ) -> Task<Result<Entity<Self>>> {
1099        let serialized_editor = match DB
1100            .get_serialized_editor(item_id, workspace_id)
1101            .context("Failed to query editor state")
1102        {
1103            Ok(Some(serialized_editor)) => {
1104                if ProjectSettings::get_global(cx)
1105                    .session
1106                    .restore_unsaved_buffers
1107                {
1108                    serialized_editor
1109                } else {
1110                    SerializedEditor {
1111                        abs_path: serialized_editor.abs_path,
1112                        contents: None,
1113                        language: None,
1114                        mtime: None,
1115                    }
1116                }
1117            }
1118            Ok(None) => {
1119                return Task::ready(Err(anyhow!(
1120                    "Unable to deserialize editor: No entry in database for item_id: {item_id} and workspace_id {workspace_id:?}"
1121                )));
1122            }
1123            Err(error) => {
1124                return Task::ready(Err(error));
1125            }
1126        };
1127        log::debug!(
1128            "Deserialized editor {item_id:?} in workspace {workspace_id:?}, {serialized_editor:?}"
1129        );
1130
1131        match serialized_editor {
1132            SerializedEditor {
1133                abs_path: None,
1134                contents: Some(contents),
1135                language,
1136                ..
1137            } => window.spawn(cx, {
1138                let project = project.clone();
1139                async move |cx| {
1140                    let language_registry =
1141                        project.read_with(cx, |project, _| project.languages().clone())?;
1142
1143                    let language = if let Some(language_name) = language {
1144                        // We don't fail here, because we'd rather not set the language if the name changed
1145                        // than fail to restore the buffer.
1146                        language_registry
1147                            .language_for_name(&language_name)
1148                            .await
1149                            .ok()
1150                    } else {
1151                        None
1152                    };
1153
1154                    // First create the empty buffer
1155                    let buffer = project
1156                        .update(cx, |project, cx| project.create_buffer(true, cx))?
1157                        .await
1158                        .context("Failed to create buffer while deserializing editor")?;
1159
1160                    // Then set the text so that the dirty bit is set correctly
1161                    buffer.update(cx, |buffer, cx| {
1162                        buffer.set_language_registry(language_registry);
1163                        if let Some(language) = language {
1164                            buffer.set_language(Some(language), cx);
1165                        }
1166                        buffer.set_text(contents, cx);
1167                        if let Some(entry) = buffer.peek_undo_stack() {
1168                            buffer.forget_transaction(entry.transaction_id());
1169                        }
1170                    })?;
1171
1172                    cx.update(|window, cx| {
1173                        cx.new(|cx| {
1174                            let mut editor = Editor::for_buffer(buffer, Some(project), window, cx);
1175
1176                            editor.read_metadata_from_db(item_id, workspace_id, window, cx);
1177                            editor
1178                        })
1179                    })
1180                }
1181            }),
1182            SerializedEditor {
1183                abs_path: Some(abs_path),
1184                contents,
1185                mtime,
1186                ..
1187            } => {
1188                let opened_buffer = project.update(cx, |project, cx| {
1189                    let (worktree, path) = project.find_worktree(&abs_path, cx)?;
1190                    let project_path = ProjectPath {
1191                        worktree_id: worktree.read(cx).id(),
1192                        path: path,
1193                    };
1194                    Some(project.open_path(project_path, cx))
1195                });
1196
1197                match opened_buffer {
1198                    Some(opened_buffer) => {
1199                        window.spawn(cx, async move |cx| {
1200                            let (_, buffer) = opened_buffer
1201                                .await
1202                                .context("Failed to open path in project")?;
1203
1204                            // This is a bit wasteful: we're loading the whole buffer from
1205                            // disk and then overwrite the content.
1206                            // But for now, it keeps the implementation of the content serialization
1207                            // simple, because we don't have to persist all of the metadata that we get
1208                            // by loading the file (git diff base, ...).
1209                            if let Some(buffer_text) = contents {
1210                                buffer.update(cx, |buffer, cx| {
1211                                    // If we did restore an mtime, we want to store it on the buffer
1212                                    // so that the next edit will mark the buffer as dirty/conflicted.
1213                                    if mtime.is_some() {
1214                                        buffer.did_reload(
1215                                            buffer.version(),
1216                                            buffer.line_ending(),
1217                                            mtime,
1218                                            cx,
1219                                        );
1220                                    }
1221                                    buffer.set_text(buffer_text, cx);
1222                                    if let Some(entry) = buffer.peek_undo_stack() {
1223                                        buffer.forget_transaction(entry.transaction_id());
1224                                    }
1225                                })?;
1226                            }
1227
1228                            cx.update(|window, cx| {
1229                                cx.new(|cx| {
1230                                    let mut editor =
1231                                        Editor::for_buffer(buffer, Some(project), window, cx);
1232
1233                                    editor.read_metadata_from_db(item_id, workspace_id, window, cx);
1234                                    editor
1235                                })
1236                            })
1237                        })
1238                    }
1239                    None => {
1240                        let open_by_abs_path = workspace.update(cx, |workspace, cx| {
1241                            workspace.open_abs_path(
1242                                abs_path.clone(),
1243                                OpenOptions {
1244                                    visible: Some(OpenVisible::None),
1245                                    ..Default::default()
1246                                },
1247                                window,
1248                                cx,
1249                            )
1250                        });
1251                        window.spawn(cx, async move |cx| {
1252                            let editor = open_by_abs_path?.await?.downcast::<Editor>().with_context(|| format!("Failed to downcast to Editor after opening abs path {abs_path:?}"))?;
1253                            editor.update_in(cx, |editor, window, cx| {
1254                                editor.read_metadata_from_db(item_id, workspace_id, window, cx);
1255                            })?;
1256                            Ok(editor)
1257                        })
1258                    }
1259                }
1260            }
1261            SerializedEditor {
1262                abs_path: None,
1263                contents: None,
1264                ..
1265            } => window.spawn(cx, async move |cx| {
1266                let buffer = project
1267                    .update(cx, |project, cx| project.create_buffer(true, cx))?
1268                    .await
1269                    .context("Failed to create buffer")?;
1270
1271                cx.update(|window, cx| {
1272                    cx.new(|cx| {
1273                        let mut editor = Editor::for_buffer(buffer, Some(project), window, cx);
1274
1275                        editor.read_metadata_from_db(item_id, workspace_id, window, cx);
1276                        editor
1277                    })
1278                })
1279            }),
1280        }
1281    }
1282
1283    fn serialize(
1284        &mut self,
1285        workspace: &mut Workspace,
1286        item_id: ItemId,
1287        closing: bool,
1288        window: &mut Window,
1289        cx: &mut Context<Self>,
1290    ) -> Option<Task<Result<()>>> {
1291        let buffer_serialization = self.buffer_serialization?;
1292        let project = self.project.clone()?;
1293
1294        let serialize_dirty_buffers = match buffer_serialization {
1295            // If we don't have a worktree, we don't serialize, because
1296            // projects without worktrees aren't deserialized.
1297            BufferSerialization::All => project.read(cx).visible_worktrees(cx).next().is_some(),
1298            BufferSerialization::NonDirtyBuffers => false,
1299        };
1300
1301        if closing && !serialize_dirty_buffers {
1302            return None;
1303        }
1304
1305        let workspace_id = workspace.database_id()?;
1306
1307        let buffer = self.buffer().read(cx).as_singleton()?;
1308
1309        let abs_path = buffer.read(cx).file().and_then(|file| {
1310            let worktree_id = file.worktree_id(cx);
1311            project
1312                .read(cx)
1313                .worktree_for_id(worktree_id, cx)
1314                .map(|worktree| worktree.read(cx).absolutize(file.path()))
1315                .or_else(|| {
1316                    let full_path = file.full_path(cx);
1317                    let project_path = project.read(cx).find_project_path(&full_path, cx)?;
1318                    project.read(cx).absolute_path(&project_path, cx)
1319                })
1320        });
1321
1322        let is_dirty = buffer.read(cx).is_dirty();
1323        let mtime = buffer.read(cx).saved_mtime();
1324
1325        let snapshot = buffer.read(cx).snapshot();
1326
1327        Some(cx.spawn_in(window, async move |_this, cx| {
1328            cx.background_spawn(async move {
1329                let (contents, language) = if serialize_dirty_buffers && is_dirty {
1330                    let contents = snapshot.text();
1331                    let language = snapshot.language().map(|lang| lang.name().to_string());
1332                    (Some(contents), language)
1333                } else {
1334                    (None, None)
1335                };
1336
1337                let editor = SerializedEditor {
1338                    abs_path,
1339                    contents,
1340                    language,
1341                    mtime,
1342                };
1343                log::debug!("Serializing editor {item_id:?} in workspace {workspace_id:?}");
1344                DB.save_serialized_editor(item_id, workspace_id, editor)
1345                    .await
1346                    .context("failed to save serialized editor")
1347            })
1348            .await
1349            .context("failed to save contents of buffer")?;
1350
1351            Ok(())
1352        }))
1353    }
1354
1355    fn should_serialize(&self, event: &Self::Event) -> bool {
1356        self.should_serialize_buffer()
1357            && matches!(
1358                event,
1359                EditorEvent::Saved | EditorEvent::DirtyChanged | EditorEvent::BufferEdited
1360            )
1361    }
1362}
1363
1364#[derive(Debug, Default)]
1365struct EditorRestorationData {
1366    entries: HashMap<PathBuf, RestorationData>,
1367}
1368
1369#[derive(Default, Debug)]
1370pub struct RestorationData {
1371    pub scroll_position: (BufferRow, gpui::Point<ScrollOffset>),
1372    pub folds: Vec<Range<Point>>,
1373    pub selections: Vec<Range<Point>>,
1374}
1375
1376impl ProjectItem for Editor {
1377    type Item = Buffer;
1378
1379    fn project_item_kind() -> Option<ProjectItemKind> {
1380        Some(ProjectItemKind("Editor"))
1381    }
1382
1383    fn for_project_item(
1384        project: Entity<Project>,
1385        pane: Option<&Pane>,
1386        buffer: Entity<Buffer>,
1387        window: &mut Window,
1388        cx: &mut Context<Self>,
1389    ) -> Self {
1390        let mut editor = Self::for_buffer(buffer.clone(), Some(project), window, cx);
1391        if let Some((excerpt_id, _, snapshot)) =
1392            editor.buffer().read(cx).snapshot(cx).as_singleton()
1393            && WorkspaceSettings::get(None, cx).restore_on_file_reopen
1394            && let Some(restoration_data) = Self::project_item_kind()
1395                .and_then(|kind| pane.as_ref()?.project_item_restoration_data.get(&kind))
1396                .and_then(|data| data.downcast_ref::<EditorRestorationData>())
1397                .and_then(|data| {
1398                    let file = project::File::from_dyn(buffer.read(cx).file())?;
1399                    data.entries.get(&file.abs_path(cx))
1400                })
1401        {
1402            editor.fold_ranges(
1403                clip_ranges(&restoration_data.folds, snapshot),
1404                false,
1405                window,
1406                cx,
1407            );
1408            if !restoration_data.selections.is_empty() {
1409                editor.change_selections(SelectionEffects::no_scroll(), window, cx, |s| {
1410                    s.select_ranges(clip_ranges(&restoration_data.selections, snapshot));
1411                });
1412            }
1413            let (top_row, offset) = restoration_data.scroll_position;
1414            let anchor =
1415                Anchor::in_buffer(*excerpt_id, snapshot.anchor_before(Point::new(top_row, 0)));
1416            editor.set_scroll_anchor(ScrollAnchor { anchor, offset }, window, cx);
1417        }
1418
1419        editor
1420    }
1421
1422    fn for_broken_project_item(
1423        abs_path: &Path,
1424        is_local: bool,
1425        e: &anyhow::Error,
1426        window: &mut Window,
1427        cx: &mut App,
1428    ) -> Option<InvalidItemView> {
1429        Some(InvalidItemView::new(abs_path, is_local, e, window, cx))
1430    }
1431}
1432
1433fn clip_ranges<'a>(
1434    original: impl IntoIterator<Item = &'a Range<Point>> + 'a,
1435    snapshot: &'a BufferSnapshot,
1436) -> Vec<Range<Point>> {
1437    original
1438        .into_iter()
1439        .map(|range| {
1440            snapshot.clip_point(range.start, Bias::Left)
1441                ..snapshot.clip_point(range.end, Bias::Right)
1442        })
1443        .collect()
1444}
1445
1446impl EventEmitter<SearchEvent> for Editor {}
1447
1448impl Editor {
1449    pub fn update_restoration_data(
1450        &self,
1451        cx: &mut Context<Self>,
1452        write: impl for<'a> FnOnce(&'a mut RestorationData) + 'static,
1453    ) {
1454        if self.mode.is_minimap() || !WorkspaceSettings::get(None, cx).restore_on_file_reopen {
1455            return;
1456        }
1457
1458        let editor = cx.entity();
1459        cx.defer(move |cx| {
1460            editor.update(cx, |editor, cx| {
1461                let kind = Editor::project_item_kind()?;
1462                let pane = editor.workspace()?.read(cx).pane_for(&cx.entity())?;
1463                let buffer = editor.buffer().read(cx).as_singleton()?;
1464                let file_abs_path = project::File::from_dyn(buffer.read(cx).file())?.abs_path(cx);
1465                pane.update(cx, |pane, _| {
1466                    let data = pane
1467                        .project_item_restoration_data
1468                        .entry(kind)
1469                        .or_insert_with(|| Box::new(EditorRestorationData::default()) as Box<_>);
1470                    let data = match data.downcast_mut::<EditorRestorationData>() {
1471                        Some(data) => data,
1472                        None => {
1473                            *data = Box::new(EditorRestorationData::default());
1474                            data.downcast_mut::<EditorRestorationData>()
1475                                .expect("just written the type downcasted to")
1476                        }
1477                    };
1478
1479                    let data = data.entries.entry(file_abs_path).or_default();
1480                    write(data);
1481                    Some(())
1482                })
1483            });
1484        });
1485    }
1486}
1487
1488pub(crate) enum BufferSearchHighlights {}
1489impl SearchableItem for Editor {
1490    type Match = Range<Anchor>;
1491
1492    fn get_matches(&self, _window: &mut Window, _: &mut App) -> Vec<Range<Anchor>> {
1493        self.background_highlights
1494            .get(&HighlightKey::Type(TypeId::of::<BufferSearchHighlights>()))
1495            .map_or(Vec::new(), |(_color, ranges)| {
1496                ranges.iter().cloned().collect()
1497            })
1498    }
1499
1500    fn clear_matches(&mut self, _: &mut Window, cx: &mut Context<Self>) {
1501        if self
1502            .clear_background_highlights::<BufferSearchHighlights>(cx)
1503            .is_some()
1504        {
1505            cx.emit(SearchEvent::MatchesInvalidated);
1506        }
1507    }
1508
1509    fn update_matches(
1510        &mut self,
1511        matches: &[Range<Anchor>],
1512        active_match_index: Option<usize>,
1513        _: &mut Window,
1514        cx: &mut Context<Self>,
1515    ) {
1516        let existing_range = self
1517            .background_highlights
1518            .get(&HighlightKey::Type(TypeId::of::<BufferSearchHighlights>()))
1519            .map(|(_, range)| range.as_ref());
1520        let updated = existing_range != Some(matches);
1521        self.highlight_background::<BufferSearchHighlights>(
1522            matches,
1523            move |index, theme| {
1524                if active_match_index == Some(*index) {
1525                    theme.colors().search_active_match_background
1526                } else {
1527                    theme.colors().search_match_background
1528                }
1529            },
1530            cx,
1531        );
1532        if updated {
1533            cx.emit(SearchEvent::MatchesInvalidated);
1534        }
1535    }
1536
1537    fn has_filtered_search_ranges(&mut self) -> bool {
1538        self.has_background_highlights::<SearchWithinRange>()
1539    }
1540
1541    fn toggle_filtered_search_ranges(
1542        &mut self,
1543        enabled: Option<FilteredSearchRange>,
1544        _: &mut Window,
1545        cx: &mut Context<Self>,
1546    ) {
1547        if self.has_filtered_search_ranges() {
1548            self.previous_search_ranges = self
1549                .clear_background_highlights::<SearchWithinRange>(cx)
1550                .map(|(_, ranges)| ranges)
1551        }
1552
1553        if let Some(range) = enabled {
1554            let ranges = self.selections.disjoint_anchor_ranges().collect::<Vec<_>>();
1555
1556            if ranges.iter().any(|s| s.start != s.end) {
1557                self.set_search_within_ranges(&ranges, cx);
1558            } else if let Some(previous_search_ranges) = self.previous_search_ranges.take()
1559                && range != FilteredSearchRange::Selection
1560            {
1561                self.set_search_within_ranges(&previous_search_ranges, cx);
1562            }
1563        }
1564    }
1565
1566    fn supported_options(&self) -> SearchOptions {
1567        if self.in_project_search {
1568            SearchOptions {
1569                case: true,
1570                word: true,
1571                regex: true,
1572                replacement: false,
1573                selection: false,
1574                find_in_results: true,
1575            }
1576        } else {
1577            SearchOptions {
1578                case: true,
1579                word: true,
1580                regex: true,
1581                replacement: true,
1582                selection: true,
1583                find_in_results: false,
1584            }
1585        }
1586    }
1587
1588    fn query_suggestion(&mut self, window: &mut Window, cx: &mut Context<Self>) -> String {
1589        let setting = EditorSettings::get_global(cx).seed_search_query_from_cursor;
1590        let snapshot = self.snapshot(window, cx);
1591        let selection = self.selections.newest_adjusted(&snapshot.display_snapshot);
1592        let buffer_snapshot = snapshot.buffer_snapshot();
1593
1594        match setting {
1595            SeedQuerySetting::Never => String::new(),
1596            SeedQuerySetting::Selection | SeedQuerySetting::Always if !selection.is_empty() => {
1597                let text: String = buffer_snapshot
1598                    .text_for_range(selection.start..selection.end)
1599                    .collect();
1600                if text.contains('\n') {
1601                    String::new()
1602                } else {
1603                    text
1604                }
1605            }
1606            SeedQuerySetting::Selection => String::new(),
1607            SeedQuerySetting::Always => {
1608                let (range, kind) = buffer_snapshot
1609                    .surrounding_word(selection.start, Some(CharScopeContext::Completion));
1610                if kind == Some(CharKind::Word) {
1611                    let text: String = buffer_snapshot.text_for_range(range).collect();
1612                    if !text.trim().is_empty() {
1613                        return text;
1614                    }
1615                }
1616                String::new()
1617            }
1618        }
1619    }
1620
1621    fn activate_match(
1622        &mut self,
1623        index: usize,
1624        matches: &[Range<Anchor>],
1625        window: &mut Window,
1626        cx: &mut Context<Self>,
1627    ) {
1628        self.unfold_ranges(&[matches[index].clone()], false, true, cx);
1629        let range = self.range_for_match(&matches[index]);
1630        let autoscroll = if EditorSettings::get_global(cx).search.center_on_match {
1631            Autoscroll::center()
1632        } else {
1633            Autoscroll::fit()
1634        };
1635        self.change_selections(SelectionEffects::scroll(autoscroll), window, cx, |s| {
1636            s.select_ranges([range]);
1637        })
1638    }
1639
1640    fn select_matches(
1641        &mut self,
1642        matches: &[Self::Match],
1643        window: &mut Window,
1644        cx: &mut Context<Self>,
1645    ) {
1646        self.unfold_ranges(matches, false, false, cx);
1647        self.change_selections(SelectionEffects::no_scroll(), window, cx, |s| {
1648            s.select_ranges(matches.iter().cloned())
1649        });
1650    }
1651    fn replace(
1652        &mut self,
1653        identifier: &Self::Match,
1654        query: &SearchQuery,
1655        window: &mut Window,
1656        cx: &mut Context<Self>,
1657    ) {
1658        let text = self.buffer.read(cx);
1659        let text = text.snapshot(cx);
1660        let text = text.text_for_range(identifier.clone()).collect::<Vec<_>>();
1661        let text: Cow<_> = if text.len() == 1 {
1662            text.first().cloned().unwrap().into()
1663        } else {
1664            let joined_chunks = text.join("");
1665            joined_chunks.into()
1666        };
1667
1668        if let Some(replacement) = query.replacement_for(&text) {
1669            self.transact(window, cx, |this, _, cx| {
1670                this.edit([(identifier.clone(), Arc::from(&*replacement))], cx);
1671            });
1672        }
1673    }
1674    fn replace_all(
1675        &mut self,
1676        matches: &mut dyn Iterator<Item = &Self::Match>,
1677        query: &SearchQuery,
1678        window: &mut Window,
1679        cx: &mut Context<Self>,
1680    ) {
1681        let text = self.buffer.read(cx);
1682        let text = text.snapshot(cx);
1683        let mut edits = vec![];
1684
1685        for m in matches {
1686            let text = text.text_for_range(m.clone()).collect::<Vec<_>>();
1687
1688            let text: Cow<_> = if text.len() == 1 {
1689                text.first().cloned().unwrap().into()
1690            } else {
1691                let joined_chunks = text.join("");
1692                joined_chunks.into()
1693            };
1694
1695            if let Some(replacement) = query.replacement_for(&text) {
1696                edits.push((m.clone(), Arc::from(&*replacement)));
1697            }
1698        }
1699
1700        if !edits.is_empty() {
1701            self.transact(window, cx, |this, _, cx| {
1702                this.edit(edits, cx);
1703            });
1704        }
1705    }
1706    fn match_index_for_direction(
1707        &mut self,
1708        matches: &[Range<Anchor>],
1709        current_index: usize,
1710        direction: Direction,
1711        count: usize,
1712        _: &mut Window,
1713        cx: &mut Context<Self>,
1714    ) -> usize {
1715        let buffer = self.buffer().read(cx).snapshot(cx);
1716        let current_index_position = if self.selections.disjoint_anchors_arc().len() == 1 {
1717            self.selections.newest_anchor().head()
1718        } else {
1719            matches[current_index].start
1720        };
1721
1722        let mut count = count % matches.len();
1723        if count == 0 {
1724            return current_index;
1725        }
1726        match direction {
1727            Direction::Next => {
1728                if matches[current_index]
1729                    .start
1730                    .cmp(&current_index_position, &buffer)
1731                    .is_gt()
1732                {
1733                    count -= 1
1734                }
1735
1736                (current_index + count) % matches.len()
1737            }
1738            Direction::Prev => {
1739                if matches[current_index]
1740                    .end
1741                    .cmp(&current_index_position, &buffer)
1742                    .is_lt()
1743                {
1744                    count -= 1;
1745                }
1746
1747                if current_index >= count {
1748                    current_index - count
1749                } else {
1750                    matches.len() - (count - current_index)
1751                }
1752            }
1753        }
1754    }
1755
1756    fn find_matches(
1757        &mut self,
1758        query: Arc<project::search::SearchQuery>,
1759        _: &mut Window,
1760        cx: &mut Context<Self>,
1761    ) -> Task<Vec<Range<Anchor>>> {
1762        let buffer = self.buffer().read(cx).snapshot(cx);
1763        let search_within_ranges = self
1764            .background_highlights
1765            .get(&HighlightKey::Type(TypeId::of::<SearchWithinRange>()))
1766            .map_or(vec![], |(_color, ranges)| {
1767                ranges.iter().cloned().collect::<Vec<_>>()
1768            });
1769
1770        cx.background_spawn(async move {
1771            let mut ranges = Vec::new();
1772
1773            let search_within_ranges = if search_within_ranges.is_empty() {
1774                vec![buffer.anchor_before(MultiBufferOffset(0))..buffer.anchor_after(buffer.len())]
1775            } else {
1776                search_within_ranges
1777            };
1778
1779            for range in search_within_ranges {
1780                for (search_buffer, search_range, excerpt_id, deleted_hunk_anchor) in
1781                    buffer.range_to_buffer_ranges_with_deleted_hunks(range)
1782                {
1783                    ranges.extend(
1784                        query
1785                            .search(
1786                                search_buffer,
1787                                Some(search_range.start.0..search_range.end.0),
1788                            )
1789                            .await
1790                            .into_iter()
1791                            .map(|match_range| {
1792                                if let Some(deleted_hunk_anchor) = deleted_hunk_anchor {
1793                                    let start = search_buffer
1794                                        .anchor_after(search_range.start + match_range.start);
1795                                    let end = search_buffer
1796                                        .anchor_before(search_range.start + match_range.end);
1797                                    deleted_hunk_anchor.with_diff_base_anchor(start)
1798                                        ..deleted_hunk_anchor.with_diff_base_anchor(end)
1799                                } else {
1800                                    let start = search_buffer
1801                                        .anchor_after(search_range.start + match_range.start);
1802                                    let end = search_buffer
1803                                        .anchor_before(search_range.start + match_range.end);
1804                                    Anchor::range_in_buffer(excerpt_id, start..end)
1805                                }
1806                            }),
1807                    );
1808                }
1809            }
1810
1811            ranges
1812        })
1813    }
1814
1815    fn active_match_index(
1816        &mut self,
1817        direction: Direction,
1818        matches: &[Range<Anchor>],
1819        _: &mut Window,
1820        cx: &mut Context<Self>,
1821    ) -> Option<usize> {
1822        active_match_index(
1823            direction,
1824            matches,
1825            &self.selections.newest_anchor().head(),
1826            &self.buffer().read(cx).snapshot(cx),
1827        )
1828    }
1829
1830    fn search_bar_visibility_changed(&mut self, _: bool, _: &mut Window, _: &mut Context<Self>) {
1831        self.expect_bounds_change = self.last_bounds;
1832    }
1833
1834    fn set_search_is_case_sensitive(
1835        &mut self,
1836        case_sensitive: Option<bool>,
1837        _cx: &mut Context<Self>,
1838    ) {
1839        self.select_next_is_case_sensitive = case_sensitive;
1840    }
1841}
1842
1843pub fn active_match_index(
1844    direction: Direction,
1845    ranges: &[Range<Anchor>],
1846    cursor: &Anchor,
1847    buffer: &MultiBufferSnapshot,
1848) -> Option<usize> {
1849    if ranges.is_empty() {
1850        None
1851    } else {
1852        let r = ranges.binary_search_by(|probe| {
1853            if probe.end.cmp(cursor, buffer).is_lt() {
1854                Ordering::Less
1855            } else if probe.start.cmp(cursor, buffer).is_gt() {
1856                Ordering::Greater
1857            } else {
1858                Ordering::Equal
1859            }
1860        });
1861        match direction {
1862            Direction::Prev => match r {
1863                Ok(i) => Some(i),
1864                Err(i) => Some(i.saturating_sub(1)),
1865            },
1866            Direction::Next => match r {
1867                Ok(i) | Err(i) => Some(cmp::min(i, ranges.len() - 1)),
1868            },
1869        }
1870    }
1871}
1872
1873pub fn entry_label_color(selected: bool) -> Color {
1874    if selected {
1875        Color::Default
1876    } else {
1877        Color::Muted
1878    }
1879}
1880
1881pub fn entry_diagnostic_aware_icon_name_and_color(
1882    diagnostic_severity: Option<DiagnosticSeverity>,
1883) -> Option<(IconName, Color)> {
1884    match diagnostic_severity {
1885        Some(DiagnosticSeverity::ERROR) => Some((IconName::Close, Color::Error)),
1886        Some(DiagnosticSeverity::WARNING) => Some((IconName::Triangle, Color::Warning)),
1887        _ => None,
1888    }
1889}
1890
1891pub fn entry_diagnostic_aware_icon_decoration_and_color(
1892    diagnostic_severity: Option<DiagnosticSeverity>,
1893) -> Option<(IconDecorationKind, Color)> {
1894    match diagnostic_severity {
1895        Some(DiagnosticSeverity::ERROR) => Some((IconDecorationKind::X, Color::Error)),
1896        Some(DiagnosticSeverity::WARNING) => Some((IconDecorationKind::Triangle, Color::Warning)),
1897        _ => None,
1898    }
1899}
1900
1901pub fn entry_git_aware_label_color(git_status: GitSummary, ignored: bool, selected: bool) -> Color {
1902    let tracked = git_status.index + git_status.worktree;
1903    if ignored {
1904        Color::Ignored
1905    } else if git_status.conflict > 0 {
1906        Color::Conflict
1907    } else if tracked.modified > 0 {
1908        Color::Modified
1909    } else if tracked.added > 0 || git_status.untracked > 0 {
1910        Color::Created
1911    } else {
1912        entry_label_color(selected)
1913    }
1914}
1915
1916fn path_for_buffer<'a>(
1917    buffer: &Entity<MultiBuffer>,
1918    height: usize,
1919    include_filename: bool,
1920    cx: &'a App,
1921) -> Option<Cow<'a, str>> {
1922    let file = buffer.read(cx).as_singleton()?.read(cx).file()?;
1923    path_for_file(file, height, include_filename, cx)
1924}
1925
1926fn path_for_file<'a>(
1927    file: &'a Arc<dyn language::File>,
1928    mut height: usize,
1929    include_filename: bool,
1930    cx: &'a App,
1931) -> Option<Cow<'a, str>> {
1932    if project::File::from_dyn(Some(file)).is_none() {
1933        return None;
1934    }
1935
1936    let file = file.as_ref();
1937    // Ensure we always render at least the filename.
1938    height += 1;
1939
1940    let mut prefix = file.path().as_ref();
1941    while height > 0 {
1942        if let Some(parent) = prefix.parent() {
1943            prefix = parent;
1944            height -= 1;
1945        } else {
1946            break;
1947        }
1948    }
1949
1950    // The full_path method allocates, so avoid calling it if height is zero.
1951    if height > 0 {
1952        let mut full_path = file.full_path(cx);
1953        if !include_filename {
1954            if !full_path.pop() {
1955                return None;
1956            }
1957        }
1958        Some(full_path.to_string_lossy().into_owned().into())
1959    } else {
1960        let mut path = file.path().strip_prefix(prefix).ok()?;
1961        if !include_filename {
1962            path = path.parent()?;
1963        }
1964        Some(path.display(file.path_style(cx)))
1965    }
1966}
1967
1968#[cfg(test)]
1969mod tests {
1970    use crate::editor_tests::init_test;
1971    use fs::Fs;
1972
1973    use super::*;
1974    use fs::MTime;
1975    use gpui::{App, VisualTestContext};
1976    use language::TestFile;
1977    use project::FakeFs;
1978    use std::path::{Path, PathBuf};
1979    use util::{path, rel_path::RelPath};
1980
1981    #[gpui::test]
1982    fn test_path_for_file(cx: &mut App) {
1983        let file: Arc<dyn language::File> = Arc::new(TestFile {
1984            path: RelPath::empty().into(),
1985            root_name: String::new(),
1986            local_root: None,
1987        });
1988        assert_eq!(path_for_file(&file, 0, false, cx), None);
1989    }
1990
1991    async fn deserialize_editor(
1992        item_id: ItemId,
1993        workspace_id: WorkspaceId,
1994        workspace: Entity<Workspace>,
1995        project: Entity<Project>,
1996        cx: &mut VisualTestContext,
1997    ) -> Entity<Editor> {
1998        workspace
1999            .update_in(cx, |workspace, window, cx| {
2000                let pane = workspace.active_pane();
2001                pane.update(cx, |_, cx| {
2002                    Editor::deserialize(
2003                        project.clone(),
2004                        workspace.weak_handle(),
2005                        workspace_id,
2006                        item_id,
2007                        window,
2008                        cx,
2009                    )
2010                })
2011            })
2012            .await
2013            .unwrap()
2014    }
2015
2016    #[gpui::test]
2017    async fn test_deserialize(cx: &mut gpui::TestAppContext) {
2018        init_test(cx, |_| {});
2019
2020        let fs = FakeFs::new(cx.executor());
2021        fs.insert_file(path!("/file.rs"), Default::default()).await;
2022
2023        // Test case 1: Deserialize with path and contents
2024        {
2025            let project = Project::test(fs.clone(), [path!("/file.rs").as_ref()], cx).await;
2026            let (workspace, cx) =
2027                cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
2028            let workspace_id = workspace::WORKSPACE_DB.next_id().await.unwrap();
2029            let item_id = 1234 as ItemId;
2030            let mtime = fs
2031                .metadata(Path::new(path!("/file.rs")))
2032                .await
2033                .unwrap()
2034                .unwrap()
2035                .mtime;
2036
2037            let serialized_editor = SerializedEditor {
2038                abs_path: Some(PathBuf::from(path!("/file.rs"))),
2039                contents: Some("fn main() {}".to_string()),
2040                language: Some("Rust".to_string()),
2041                mtime: Some(mtime),
2042            };
2043
2044            DB.save_serialized_editor(item_id, workspace_id, serialized_editor.clone())
2045                .await
2046                .unwrap();
2047
2048            let deserialized =
2049                deserialize_editor(item_id, workspace_id, workspace, project, cx).await;
2050
2051            deserialized.update(cx, |editor, cx| {
2052                assert_eq!(editor.text(cx), "fn main() {}");
2053                assert!(editor.is_dirty(cx));
2054                assert!(!editor.has_conflict(cx));
2055                let buffer = editor.buffer().read(cx).as_singleton().unwrap().read(cx);
2056                assert!(buffer.file().is_some());
2057            });
2058        }
2059
2060        // Test case 2: Deserialize with only path
2061        {
2062            let project = Project::test(fs.clone(), [path!("/file.rs").as_ref()], cx).await;
2063            let (workspace, cx) =
2064                cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
2065
2066            let workspace_id = workspace::WORKSPACE_DB.next_id().await.unwrap();
2067
2068            let item_id = 5678 as ItemId;
2069            let serialized_editor = SerializedEditor {
2070                abs_path: Some(PathBuf::from(path!("/file.rs"))),
2071                contents: None,
2072                language: None,
2073                mtime: None,
2074            };
2075
2076            DB.save_serialized_editor(item_id, workspace_id, serialized_editor)
2077                .await
2078                .unwrap();
2079
2080            let deserialized =
2081                deserialize_editor(item_id, workspace_id, workspace, project, cx).await;
2082
2083            deserialized.update(cx, |editor, cx| {
2084                assert_eq!(editor.text(cx), ""); // The file should be empty as per our initial setup
2085                assert!(!editor.is_dirty(cx));
2086                assert!(!editor.has_conflict(cx));
2087
2088                let buffer = editor.buffer().read(cx).as_singleton().unwrap().read(cx);
2089                assert!(buffer.file().is_some());
2090            });
2091        }
2092
2093        // Test case 3: Deserialize with no path (untitled buffer, with content and language)
2094        {
2095            let project = Project::test(fs.clone(), [path!("/file.rs").as_ref()], cx).await;
2096            // Add Rust to the language, so that we can restore the language of the buffer
2097            project.read_with(cx, |project, _| {
2098                project.languages().add(languages::rust_lang())
2099            });
2100
2101            let (workspace, cx) =
2102                cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
2103
2104            let workspace_id = workspace::WORKSPACE_DB.next_id().await.unwrap();
2105
2106            let item_id = 9012 as ItemId;
2107            let serialized_editor = SerializedEditor {
2108                abs_path: None,
2109                contents: Some("hello".to_string()),
2110                language: Some("Rust".to_string()),
2111                mtime: None,
2112            };
2113
2114            DB.save_serialized_editor(item_id, workspace_id, serialized_editor)
2115                .await
2116                .unwrap();
2117
2118            let deserialized =
2119                deserialize_editor(item_id, workspace_id, workspace, project, cx).await;
2120
2121            deserialized.update(cx, |editor, cx| {
2122                assert_eq!(editor.text(cx), "hello");
2123                assert!(editor.is_dirty(cx)); // The editor should be dirty for an untitled buffer
2124
2125                let buffer = editor.buffer().read(cx).as_singleton().unwrap().read(cx);
2126                assert_eq!(
2127                    buffer.language().map(|lang| lang.name()),
2128                    Some("Rust".into())
2129                ); // Language should be set to Rust
2130                assert!(buffer.file().is_none()); // The buffer should not have an associated file
2131            });
2132        }
2133
2134        // Test case 4: Deserialize with path, content, and old mtime
2135        {
2136            let project = Project::test(fs.clone(), [path!("/file.rs").as_ref()], cx).await;
2137            let (workspace, cx) =
2138                cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
2139
2140            let workspace_id = workspace::WORKSPACE_DB.next_id().await.unwrap();
2141
2142            let item_id = 9345 as ItemId;
2143            let old_mtime = MTime::from_seconds_and_nanos(0, 50);
2144            let serialized_editor = SerializedEditor {
2145                abs_path: Some(PathBuf::from(path!("/file.rs"))),
2146                contents: Some("fn main() {}".to_string()),
2147                language: Some("Rust".to_string()),
2148                mtime: Some(old_mtime),
2149            };
2150
2151            DB.save_serialized_editor(item_id, workspace_id, serialized_editor)
2152                .await
2153                .unwrap();
2154
2155            let deserialized =
2156                deserialize_editor(item_id, workspace_id, workspace, project, cx).await;
2157
2158            deserialized.update(cx, |editor, cx| {
2159                assert_eq!(editor.text(cx), "fn main() {}");
2160                assert!(editor.has_conflict(cx)); // The editor should have a conflict
2161            });
2162        }
2163
2164        // Test case 5: Deserialize with no path, no content, no language, and no old mtime (new, empty, unsaved buffer)
2165        {
2166            let project = Project::test(fs.clone(), [path!("/file.rs").as_ref()], cx).await;
2167            let (workspace, cx) =
2168                cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
2169
2170            let workspace_id = workspace::WORKSPACE_DB.next_id().await.unwrap();
2171
2172            let item_id = 10000 as ItemId;
2173            let serialized_editor = SerializedEditor {
2174                abs_path: None,
2175                contents: None,
2176                language: None,
2177                mtime: None,
2178            };
2179
2180            DB.save_serialized_editor(item_id, workspace_id, serialized_editor)
2181                .await
2182                .unwrap();
2183
2184            let deserialized =
2185                deserialize_editor(item_id, workspace_id, workspace, project, cx).await;
2186
2187            deserialized.update(cx, |editor, cx| {
2188                assert_eq!(editor.text(cx), "");
2189                assert!(!editor.is_dirty(cx));
2190                assert!(!editor.has_conflict(cx));
2191
2192                let buffer = editor.buffer().read(cx).as_singleton().unwrap().read(cx);
2193                assert!(buffer.file().is_none());
2194            });
2195        }
2196    }
2197}