1use crate::{
   2    Anchor, Autoscroll, BufferSerialization, Editor, EditorEvent, EditorSettings, ExcerptId,
   3    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    fn has_deleted_file(&self, cx: &App) -> bool {
 813        self.buffer().read(cx).read(cx).has_deleted_file()
 814    }
 815
 816    fn has_conflict(&self, cx: &App) -> bool {
 817        self.buffer().read(cx).read(cx).has_conflict()
 818    }
 819
 820    fn can_save(&self, cx: &App) -> bool {
 821        let buffer = &self.buffer().read(cx);
 822        if let Some(buffer) = buffer.as_singleton() {
 823            buffer.read(cx).project_path(cx).is_some()
 824        } else {
 825            true
 826        }
 827    }
 828
 829    fn save(
 830        &mut self,
 831        options: SaveOptions,
 832        project: Entity<Project>,
 833        window: &mut Window,
 834        cx: &mut Context<Self>,
 835    ) -> Task<Result<()>> {
 836        // Add meta data tracking # of auto saves
 837        if options.autosave {
 838            self.report_editor_event(ReportEditorEvent::Saved { auto_saved: true }, None, cx);
 839        } else {
 840            self.report_editor_event(ReportEditorEvent::Saved { auto_saved: false }, None, cx);
 841        }
 842
 843        let buffers = self.buffer().clone().read(cx).all_buffers();
 844        let buffers = buffers
 845            .into_iter()
 846            .map(|handle| handle.read(cx).base_buffer().unwrap_or(handle.clone()))
 847            .collect::<HashSet<_>>();
 848
 849        let buffers_to_save = if self.buffer.read(cx).is_singleton() && !options.autosave {
 850            buffers
 851        } else {
 852            buffers
 853                .into_iter()
 854                .filter(|buffer| buffer.read(cx).is_dirty())
 855                .collect()
 856        };
 857
 858        cx.spawn_in(window, async move |this, cx| {
 859            if options.format {
 860                this.update_in(cx, |editor, window, cx| {
 861                    editor.perform_format(
 862                        project.clone(),
 863                        FormatTrigger::Save,
 864                        FormatTarget::Buffers(buffers_to_save.clone()),
 865                        window,
 866                        cx,
 867                    )
 868                })?
 869                .await?;
 870            }
 871
 872            if !buffers_to_save.is_empty() {
 873                project
 874                    .update(cx, |project, cx| {
 875                        project.save_buffers(buffers_to_save.clone(), cx)
 876                    })?
 877                    .await?;
 878            }
 879
 880            Ok(())
 881        })
 882    }
 883
 884    fn save_as(
 885        &mut self,
 886        project: Entity<Project>,
 887        path: ProjectPath,
 888        _: &mut Window,
 889        cx: &mut Context<Self>,
 890    ) -> Task<Result<()>> {
 891        let buffer = self
 892            .buffer()
 893            .read(cx)
 894            .as_singleton()
 895            .expect("cannot call save_as on an excerpt list");
 896
 897        let file_extension = path.path.extension().map(|a| a.to_string());
 898        self.report_editor_event(
 899            ReportEditorEvent::Saved { auto_saved: false },
 900            file_extension,
 901            cx,
 902        );
 903
 904        project.update(cx, |project, cx| project.save_buffer_as(buffer, path, cx))
 905    }
 906
 907    fn reload(
 908        &mut self,
 909        project: Entity<Project>,
 910        window: &mut Window,
 911        cx: &mut Context<Self>,
 912    ) -> Task<Result<()>> {
 913        let buffer = self.buffer().clone();
 914        let buffers = self.buffer.read(cx).all_buffers();
 915        let reload_buffers =
 916            project.update(cx, |project, cx| project.reload_buffers(buffers, true, cx));
 917        cx.spawn_in(window, async move |this, cx| {
 918            let transaction = reload_buffers.log_err().await;
 919            this.update(cx, |editor, cx| {
 920                editor.request_autoscroll(Autoscroll::fit(), cx)
 921            })?;
 922            buffer
 923                .update(cx, |buffer, cx| {
 924                    if let Some(transaction) = transaction
 925                        && !buffer.is_singleton()
 926                    {
 927                        buffer.push_transaction(&transaction.0, cx);
 928                    }
 929                })
 930                .ok();
 931            Ok(())
 932        })
 933    }
 934
 935    fn as_searchable(
 936        &self,
 937        handle: &Entity<Self>,
 938        _: &App,
 939    ) -> Option<Box<dyn SearchableItemHandle>> {
 940        Some(Box::new(handle.clone()))
 941    }
 942
 943    fn pixel_position_of_cursor(&self, _: &App) -> Option<gpui::Point<Pixels>> {
 944        self.pixel_position_of_newest_cursor
 945    }
 946
 947    fn breadcrumb_location(&self, _: &App) -> ToolbarItemLocation {
 948        if self.show_breadcrumbs {
 949            ToolbarItemLocation::PrimaryLeft
 950        } else {
 951            ToolbarItemLocation::Hidden
 952        }
 953    }
 954
 955    fn breadcrumbs(&self, variant: &Theme, cx: &App) -> Option<Vec<BreadcrumbText>> {
 956        let cursor = self.selections.newest_anchor().head();
 957        let multibuffer = self.buffer().read(cx);
 958        let (buffer_id, symbols) = multibuffer
 959            .read(cx)
 960            .symbols_containing(cursor, Some(variant.syntax()))?;
 961        let buffer = multibuffer.buffer(buffer_id)?;
 962
 963        let buffer = buffer.read(cx);
 964        let text = self.breadcrumb_header.clone().unwrap_or_else(|| {
 965            buffer
 966                .snapshot()
 967                .resolve_file_path(
 968                    self.project
 969                        .as_ref()
 970                        .map(|project| project.read(cx).visible_worktrees(cx).count() > 1)
 971                        .unwrap_or_default(),
 972                    cx,
 973                )
 974                .unwrap_or_else(|| {
 975                    if multibuffer.is_singleton() {
 976                        multibuffer.title(cx).to_string()
 977                    } else {
 978                        "untitled".to_string()
 979                    }
 980                })
 981        });
 982
 983        let settings = ThemeSettings::get_global(cx);
 984
 985        let mut breadcrumbs = vec![BreadcrumbText {
 986            text,
 987            highlights: None,
 988            font: Some(settings.buffer_font.clone()),
 989        }];
 990
 991        breadcrumbs.extend(symbols.into_iter().map(|symbol| BreadcrumbText {
 992            text: symbol.text,
 993            highlights: Some(symbol.highlight_ranges),
 994            font: Some(settings.buffer_font.clone()),
 995        }));
 996        Some(breadcrumbs)
 997    }
 998
 999    fn added_to_workspace(
1000        &mut self,
1001        workspace: &mut Workspace,
1002        _window: &mut Window,
1003        cx: &mut Context<Self>,
1004    ) {
1005        self.workspace = Some((workspace.weak_handle(), workspace.database_id()));
1006        if let Some(workspace) = &workspace.weak_handle().upgrade() {
1007            cx.subscribe(workspace, |editor, _, event: &workspace::Event, _cx| {
1008                if let workspace::Event::ModalOpened = event {
1009                    editor.mouse_context_menu.take();
1010                    editor.inline_blame_popover.take();
1011                }
1012            })
1013            .detach();
1014        }
1015    }
1016
1017    fn to_item_events(event: &EditorEvent, mut f: impl FnMut(ItemEvent)) {
1018        match event {
1019            EditorEvent::Saved | EditorEvent::TitleChanged => {
1020                f(ItemEvent::UpdateTab);
1021                f(ItemEvent::UpdateBreadcrumbs);
1022            }
1023
1024            EditorEvent::Reparsed(_) => {
1025                f(ItemEvent::UpdateBreadcrumbs);
1026            }
1027
1028            EditorEvent::SelectionsChanged { local } if *local => {
1029                f(ItemEvent::UpdateBreadcrumbs);
1030            }
1031
1032            EditorEvent::BreadcrumbsChanged => {
1033                f(ItemEvent::UpdateBreadcrumbs);
1034            }
1035
1036            EditorEvent::DirtyChanged => {
1037                f(ItemEvent::UpdateTab);
1038            }
1039
1040            EditorEvent::BufferEdited => {
1041                f(ItemEvent::Edit);
1042                f(ItemEvent::UpdateBreadcrumbs);
1043            }
1044
1045            EditorEvent::ExcerptsAdded { .. } | EditorEvent::ExcerptsRemoved { .. } => {
1046                f(ItemEvent::Edit);
1047            }
1048
1049            _ => {}
1050        }
1051    }
1052
1053    fn preserve_preview(&self, cx: &App) -> bool {
1054        self.buffer.read(cx).preserve_preview(cx)
1055    }
1056}
1057
1058impl SerializableItem for Editor {
1059    fn serialized_item_kind() -> &'static str {
1060        "Editor"
1061    }
1062
1063    fn cleanup(
1064        workspace_id: WorkspaceId,
1065        alive_items: Vec<ItemId>,
1066        _window: &mut Window,
1067        cx: &mut App,
1068    ) -> Task<Result<()>> {
1069        workspace::delete_unloaded_items(alive_items, workspace_id, "editors", &DB, cx)
1070    }
1071
1072    fn deserialize(
1073        project: Entity<Project>,
1074        workspace: WeakEntity<Workspace>,
1075        workspace_id: workspace::WorkspaceId,
1076        item_id: ItemId,
1077        window: &mut Window,
1078        cx: &mut App,
1079    ) -> Task<Result<Entity<Self>>> {
1080        let serialized_editor = match DB
1081            .get_serialized_editor(item_id, workspace_id)
1082            .context("Failed to query editor state")
1083        {
1084            Ok(Some(serialized_editor)) => {
1085                if ProjectSettings::get_global(cx)
1086                    .session
1087                    .restore_unsaved_buffers
1088                {
1089                    serialized_editor
1090                } else {
1091                    SerializedEditor {
1092                        abs_path: serialized_editor.abs_path,
1093                        contents: None,
1094                        language: None,
1095                        mtime: None,
1096                    }
1097                }
1098            }
1099            Ok(None) => {
1100                return Task::ready(Err(anyhow!(
1101                    "Unable to deserialize editor: No entry in database for item_id: {item_id} and workspace_id {workspace_id:?}"
1102                )));
1103            }
1104            Err(error) => {
1105                return Task::ready(Err(error));
1106            }
1107        };
1108        log::debug!(
1109            "Deserialized editor {item_id:?} in workspace {workspace_id:?}, {serialized_editor:?}"
1110        );
1111
1112        match serialized_editor {
1113            SerializedEditor {
1114                abs_path: None,
1115                contents: Some(contents),
1116                language,
1117                ..
1118            } => window.spawn(cx, {
1119                let project = project.clone();
1120                async move |cx| {
1121                    let language_registry =
1122                        project.read_with(cx, |project, _| project.languages().clone())?;
1123
1124                    let language = if let Some(language_name) = language {
1125                        // We don't fail here, because we'd rather not set the language if the name changed
1126                        // than fail to restore the buffer.
1127                        language_registry
1128                            .language_for_name(&language_name)
1129                            .await
1130                            .ok()
1131                    } else {
1132                        None
1133                    };
1134
1135                    // First create the empty buffer
1136                    let buffer = project
1137                        .update(cx, |project, cx| project.create_buffer(true, cx))?
1138                        .await
1139                        .context("Failed to create buffer while deserializing editor")?;
1140
1141                    // Then set the text so that the dirty bit is set correctly
1142                    buffer.update(cx, |buffer, cx| {
1143                        buffer.set_language_registry(language_registry);
1144                        if let Some(language) = language {
1145                            buffer.set_language(Some(language), cx);
1146                        }
1147                        buffer.set_text(contents, cx);
1148                        if let Some(entry) = buffer.peek_undo_stack() {
1149                            buffer.forget_transaction(entry.transaction_id());
1150                        }
1151                    })?;
1152
1153                    cx.update(|window, cx| {
1154                        cx.new(|cx| {
1155                            let mut editor = Editor::for_buffer(buffer, Some(project), window, cx);
1156
1157                            editor.read_metadata_from_db(item_id, workspace_id, window, cx);
1158                            editor
1159                        })
1160                    })
1161                }
1162            }),
1163            SerializedEditor {
1164                abs_path: Some(abs_path),
1165                contents,
1166                mtime,
1167                ..
1168            } => {
1169                let opened_buffer = project.update(cx, |project, cx| {
1170                    let (worktree, path) = project.find_worktree(&abs_path, cx)?;
1171                    let project_path = ProjectPath {
1172                        worktree_id: worktree.read(cx).id(),
1173                        path: path,
1174                    };
1175                    Some(project.open_path(project_path, cx))
1176                });
1177
1178                match opened_buffer {
1179                    Some(opened_buffer) => {
1180                        window.spawn(cx, async move |cx| {
1181                            let (_, buffer) = opened_buffer
1182                                .await
1183                                .context("Failed to open path in project")?;
1184
1185                            // This is a bit wasteful: we're loading the whole buffer from
1186                            // disk and then overwrite the content.
1187                            // But for now, it keeps the implementation of the content serialization
1188                            // simple, because we don't have to persist all of the metadata that we get
1189                            // by loading the file (git diff base, ...).
1190                            if let Some(buffer_text) = contents {
1191                                buffer.update(cx, |buffer, cx| {
1192                                    // If we did restore an mtime, we want to store it on the buffer
1193                                    // so that the next edit will mark the buffer as dirty/conflicted.
1194                                    if mtime.is_some() {
1195                                        buffer.did_reload(
1196                                            buffer.version(),
1197                                            buffer.line_ending(),
1198                                            mtime,
1199                                            cx,
1200                                        );
1201                                    }
1202                                    buffer.set_text(buffer_text, cx);
1203                                    if let Some(entry) = buffer.peek_undo_stack() {
1204                                        buffer.forget_transaction(entry.transaction_id());
1205                                    }
1206                                })?;
1207                            }
1208
1209                            cx.update(|window, cx| {
1210                                cx.new(|cx| {
1211                                    let mut editor =
1212                                        Editor::for_buffer(buffer, Some(project), window, cx);
1213
1214                                    editor.read_metadata_from_db(item_id, workspace_id, window, cx);
1215                                    editor
1216                                })
1217                            })
1218                        })
1219                    }
1220                    None => {
1221                        let open_by_abs_path = workspace.update(cx, |workspace, cx| {
1222                            workspace.open_abs_path(
1223                                abs_path.clone(),
1224                                OpenOptions {
1225                                    visible: Some(OpenVisible::None),
1226                                    ..Default::default()
1227                                },
1228                                window,
1229                                cx,
1230                            )
1231                        });
1232                        window.spawn(cx, async move |cx| {
1233                            let editor = open_by_abs_path?.await?.downcast::<Editor>().with_context(|| format!("Failed to downcast to Editor after opening abs path {abs_path:?}"))?;
1234                            editor.update_in(cx, |editor, window, cx| {
1235                                editor.read_metadata_from_db(item_id, workspace_id, window, cx);
1236                            })?;
1237                            Ok(editor)
1238                        })
1239                    }
1240                }
1241            }
1242            SerializedEditor {
1243                abs_path: None,
1244                contents: None,
1245                ..
1246            } => window.spawn(cx, async move |cx| {
1247                let buffer = project
1248                    .update(cx, |project, cx| project.create_buffer(true, cx))?
1249                    .await
1250                    .context("Failed to create buffer")?;
1251
1252                cx.update(|window, cx| {
1253                    cx.new(|cx| {
1254                        let mut editor = Editor::for_buffer(buffer, Some(project), window, cx);
1255
1256                        editor.read_metadata_from_db(item_id, workspace_id, window, cx);
1257                        editor
1258                    })
1259                })
1260            }),
1261        }
1262    }
1263
1264    fn serialize(
1265        &mut self,
1266        workspace: &mut Workspace,
1267        item_id: ItemId,
1268        closing: bool,
1269        window: &mut Window,
1270        cx: &mut Context<Self>,
1271    ) -> Option<Task<Result<()>>> {
1272        let buffer_serialization = self.buffer_serialization?;
1273        let project = self.project.clone()?;
1274
1275        let serialize_dirty_buffers = match buffer_serialization {
1276            // If we don't have a worktree, we don't serialize, because
1277            // projects without worktrees aren't deserialized.
1278            BufferSerialization::All => project.read(cx).visible_worktrees(cx).next().is_some(),
1279            BufferSerialization::NonDirtyBuffers => false,
1280        };
1281
1282        if closing && !serialize_dirty_buffers {
1283            return None;
1284        }
1285
1286        let workspace_id = workspace.database_id()?;
1287
1288        let buffer = self.buffer().read(cx).as_singleton()?;
1289
1290        let abs_path = buffer.read(cx).file().and_then(|file| {
1291            let worktree_id = file.worktree_id(cx);
1292            project
1293                .read(cx)
1294                .worktree_for_id(worktree_id, cx)
1295                .map(|worktree| worktree.read(cx).absolutize(file.path()))
1296                .or_else(|| {
1297                    let full_path = file.full_path(cx);
1298                    let project_path = project.read(cx).find_project_path(&full_path, cx)?;
1299                    project.read(cx).absolute_path(&project_path, cx)
1300                })
1301        });
1302
1303        let is_dirty = buffer.read(cx).is_dirty();
1304        let mtime = buffer.read(cx).saved_mtime();
1305
1306        let snapshot = buffer.read(cx).snapshot();
1307
1308        Some(cx.spawn_in(window, async move |_this, cx| {
1309            cx.background_spawn(async move {
1310                let (contents, language) = if serialize_dirty_buffers && is_dirty {
1311                    let contents = snapshot.text();
1312                    let language = snapshot.language().map(|lang| lang.name().to_string());
1313                    (Some(contents), language)
1314                } else {
1315                    (None, None)
1316                };
1317
1318                let editor = SerializedEditor {
1319                    abs_path,
1320                    contents,
1321                    language,
1322                    mtime,
1323                };
1324                log::debug!("Serializing editor {item_id:?} in workspace {workspace_id:?}");
1325                DB.save_serialized_editor(item_id, workspace_id, editor)
1326                    .await
1327                    .context("failed to save serialized editor")
1328            })
1329            .await
1330            .context("failed to save contents of buffer")?;
1331
1332            Ok(())
1333        }))
1334    }
1335
1336    fn should_serialize(&self, event: &Self::Event) -> bool {
1337        self.should_serialize_buffer()
1338            && matches!(
1339                event,
1340                EditorEvent::Saved | EditorEvent::DirtyChanged | EditorEvent::BufferEdited
1341            )
1342    }
1343}
1344
1345#[derive(Debug, Default)]
1346struct EditorRestorationData {
1347    entries: HashMap<PathBuf, RestorationData>,
1348}
1349
1350#[derive(Default, Debug)]
1351pub struct RestorationData {
1352    pub scroll_position: (BufferRow, gpui::Point<ScrollOffset>),
1353    pub folds: Vec<Range<Point>>,
1354    pub selections: Vec<Range<Point>>,
1355}
1356
1357impl ProjectItem for Editor {
1358    type Item = Buffer;
1359
1360    fn project_item_kind() -> Option<ProjectItemKind> {
1361        Some(ProjectItemKind("Editor"))
1362    }
1363
1364    fn for_project_item(
1365        project: Entity<Project>,
1366        pane: Option<&Pane>,
1367        buffer: Entity<Buffer>,
1368        window: &mut Window,
1369        cx: &mut Context<Self>,
1370    ) -> Self {
1371        let mut editor = Self::for_buffer(buffer.clone(), Some(project), window, cx);
1372        if let Some((excerpt_id, _, snapshot)) =
1373            editor.buffer().read(cx).snapshot(cx).as_singleton()
1374            && WorkspaceSettings::get(None, cx).restore_on_file_reopen
1375            && let Some(restoration_data) = Self::project_item_kind()
1376                .and_then(|kind| pane.as_ref()?.project_item_restoration_data.get(&kind))
1377                .and_then(|data| data.downcast_ref::<EditorRestorationData>())
1378                .and_then(|data| {
1379                    let file = project::File::from_dyn(buffer.read(cx).file())?;
1380                    data.entries.get(&file.abs_path(cx))
1381                })
1382        {
1383            editor.fold_ranges(
1384                clip_ranges(&restoration_data.folds, snapshot),
1385                false,
1386                window,
1387                cx,
1388            );
1389            if !restoration_data.selections.is_empty() {
1390                editor.change_selections(SelectionEffects::no_scroll(), window, cx, |s| {
1391                    s.select_ranges(clip_ranges(&restoration_data.selections, snapshot));
1392                });
1393            }
1394            let (top_row, offset) = restoration_data.scroll_position;
1395            let anchor =
1396                Anchor::in_buffer(*excerpt_id, snapshot.anchor_before(Point::new(top_row, 0)));
1397            editor.set_scroll_anchor(ScrollAnchor { anchor, offset }, window, cx);
1398        }
1399
1400        editor
1401    }
1402
1403    fn for_broken_project_item(
1404        abs_path: &Path,
1405        is_local: bool,
1406        e: &anyhow::Error,
1407        window: &mut Window,
1408        cx: &mut App,
1409    ) -> Option<InvalidItemView> {
1410        Some(InvalidItemView::new(abs_path, is_local, e, window, cx))
1411    }
1412}
1413
1414fn clip_ranges<'a>(
1415    original: impl IntoIterator<Item = &'a Range<Point>> + 'a,
1416    snapshot: &'a BufferSnapshot,
1417) -> Vec<Range<Point>> {
1418    original
1419        .into_iter()
1420        .map(|range| {
1421            snapshot.clip_point(range.start, Bias::Left)
1422                ..snapshot.clip_point(range.end, Bias::Right)
1423        })
1424        .collect()
1425}
1426
1427impl EventEmitter<SearchEvent> for Editor {}
1428
1429impl Editor {
1430    pub fn update_restoration_data(
1431        &self,
1432        cx: &mut Context<Self>,
1433        write: impl for<'a> FnOnce(&'a mut RestorationData) + 'static,
1434    ) {
1435        if self.mode.is_minimap() || !WorkspaceSettings::get(None, cx).restore_on_file_reopen {
1436            return;
1437        }
1438
1439        let editor = cx.entity();
1440        cx.defer(move |cx| {
1441            editor.update(cx, |editor, cx| {
1442                let kind = Editor::project_item_kind()?;
1443                let pane = editor.workspace()?.read(cx).pane_for(&cx.entity())?;
1444                let buffer = editor.buffer().read(cx).as_singleton()?;
1445                let file_abs_path = project::File::from_dyn(buffer.read(cx).file())?.abs_path(cx);
1446                pane.update(cx, |pane, _| {
1447                    let data = pane
1448                        .project_item_restoration_data
1449                        .entry(kind)
1450                        .or_insert_with(|| Box::new(EditorRestorationData::default()) as Box<_>);
1451                    let data = match data.downcast_mut::<EditorRestorationData>() {
1452                        Some(data) => data,
1453                        None => {
1454                            *data = Box::new(EditorRestorationData::default());
1455                            data.downcast_mut::<EditorRestorationData>()
1456                                .expect("just written the type downcasted to")
1457                        }
1458                    };
1459
1460                    let data = data.entries.entry(file_abs_path).or_default();
1461                    write(data);
1462                    Some(())
1463                })
1464            });
1465        });
1466    }
1467}
1468
1469pub(crate) enum BufferSearchHighlights {}
1470impl SearchableItem for Editor {
1471    type Match = Range<Anchor>;
1472
1473    fn get_matches(&self, _window: &mut Window, _: &mut App) -> Vec<Range<Anchor>> {
1474        self.background_highlights
1475            .get(&HighlightKey::Type(TypeId::of::<BufferSearchHighlights>()))
1476            .map_or(Vec::new(), |(_color, ranges)| {
1477                ranges.iter().cloned().collect()
1478            })
1479    }
1480
1481    fn clear_matches(&mut self, _: &mut Window, cx: &mut Context<Self>) {
1482        if self
1483            .clear_background_highlights::<BufferSearchHighlights>(cx)
1484            .is_some()
1485        {
1486            cx.emit(SearchEvent::MatchesInvalidated);
1487        }
1488    }
1489
1490    fn update_matches(
1491        &mut self,
1492        matches: &[Range<Anchor>],
1493        active_match_index: Option<usize>,
1494        _: &mut Window,
1495        cx: &mut Context<Self>,
1496    ) {
1497        let existing_range = self
1498            .background_highlights
1499            .get(&HighlightKey::Type(TypeId::of::<BufferSearchHighlights>()))
1500            .map(|(_, range)| range.as_ref());
1501        let updated = existing_range != Some(matches);
1502        self.highlight_background::<BufferSearchHighlights>(
1503            matches,
1504            move |index, theme| {
1505                if active_match_index == Some(*index) {
1506                    theme.colors().search_active_match_background
1507                } else {
1508                    theme.colors().search_match_background
1509                }
1510            },
1511            cx,
1512        );
1513        if updated {
1514            cx.emit(SearchEvent::MatchesInvalidated);
1515        }
1516    }
1517
1518    fn has_filtered_search_ranges(&mut self) -> bool {
1519        self.has_background_highlights::<SearchWithinRange>()
1520    }
1521
1522    fn toggle_filtered_search_ranges(
1523        &mut self,
1524        enabled: Option<FilteredSearchRange>,
1525        _: &mut Window,
1526        cx: &mut Context<Self>,
1527    ) {
1528        if self.has_filtered_search_ranges() {
1529            self.previous_search_ranges = self
1530                .clear_background_highlights::<SearchWithinRange>(cx)
1531                .map(|(_, ranges)| ranges)
1532        }
1533
1534        if let Some(range) = enabled {
1535            let ranges = self.selections.disjoint_anchor_ranges().collect::<Vec<_>>();
1536
1537            if ranges.iter().any(|s| s.start != s.end) {
1538                self.set_search_within_ranges(&ranges, cx);
1539            } else if let Some(previous_search_ranges) = self.previous_search_ranges.take()
1540                && range != FilteredSearchRange::Selection
1541            {
1542                self.set_search_within_ranges(&previous_search_ranges, cx);
1543            }
1544        }
1545    }
1546
1547    fn supported_options(&self) -> SearchOptions {
1548        if self.in_project_search {
1549            SearchOptions {
1550                case: true,
1551                word: true,
1552                regex: true,
1553                replacement: false,
1554                selection: false,
1555                find_in_results: true,
1556            }
1557        } else {
1558            SearchOptions {
1559                case: true,
1560                word: true,
1561                regex: true,
1562                replacement: true,
1563                selection: true,
1564                find_in_results: false,
1565            }
1566        }
1567    }
1568
1569    fn query_suggestion(&mut self, window: &mut Window, cx: &mut Context<Self>) -> String {
1570        let setting = EditorSettings::get_global(cx).seed_search_query_from_cursor;
1571        let snapshot = self.snapshot(window, cx);
1572        let selection = self.selections.newest_adjusted(&snapshot.display_snapshot);
1573        let buffer_snapshot = snapshot.buffer_snapshot();
1574
1575        match setting {
1576            SeedQuerySetting::Never => String::new(),
1577            SeedQuerySetting::Selection | SeedQuerySetting::Always if !selection.is_empty() => {
1578                let text: String = buffer_snapshot
1579                    .text_for_range(selection.start..selection.end)
1580                    .collect();
1581                if text.contains('\n') {
1582                    String::new()
1583                } else {
1584                    text
1585                }
1586            }
1587            SeedQuerySetting::Selection => String::new(),
1588            SeedQuerySetting::Always => {
1589                let (range, kind) = buffer_snapshot
1590                    .surrounding_word(selection.start, Some(CharScopeContext::Completion));
1591                if kind == Some(CharKind::Word) {
1592                    let text: String = buffer_snapshot.text_for_range(range).collect();
1593                    if !text.trim().is_empty() {
1594                        return text;
1595                    }
1596                }
1597                String::new()
1598            }
1599        }
1600    }
1601
1602    fn activate_match(
1603        &mut self,
1604        index: usize,
1605        matches: &[Range<Anchor>],
1606        window: &mut Window,
1607        cx: &mut Context<Self>,
1608    ) {
1609        self.unfold_ranges(&[matches[index].clone()], false, true, cx);
1610        let range = self.range_for_match(&matches[index]);
1611        let autoscroll = if EditorSettings::get_global(cx).search.center_on_match {
1612            Autoscroll::center()
1613        } else {
1614            Autoscroll::fit()
1615        };
1616        self.change_selections(SelectionEffects::scroll(autoscroll), window, cx, |s| {
1617            s.select_ranges([range]);
1618        })
1619    }
1620
1621    fn select_matches(
1622        &mut self,
1623        matches: &[Self::Match],
1624        window: &mut Window,
1625        cx: &mut Context<Self>,
1626    ) {
1627        self.unfold_ranges(matches, false, false, cx);
1628        self.change_selections(SelectionEffects::no_scroll(), window, cx, |s| {
1629            s.select_ranges(matches.iter().cloned())
1630        });
1631    }
1632    fn replace(
1633        &mut self,
1634        identifier: &Self::Match,
1635        query: &SearchQuery,
1636        window: &mut Window,
1637        cx: &mut Context<Self>,
1638    ) {
1639        let text = self.buffer.read(cx);
1640        let text = text.snapshot(cx);
1641        let text = text.text_for_range(identifier.clone()).collect::<Vec<_>>();
1642        let text: Cow<_> = if text.len() == 1 {
1643            text.first().cloned().unwrap().into()
1644        } else {
1645            let joined_chunks = text.join("");
1646            joined_chunks.into()
1647        };
1648
1649        if let Some(replacement) = query.replacement_for(&text) {
1650            self.transact(window, cx, |this, _, cx| {
1651                this.edit([(identifier.clone(), Arc::from(&*replacement))], cx);
1652            });
1653        }
1654    }
1655    fn replace_all(
1656        &mut self,
1657        matches: &mut dyn Iterator<Item = &Self::Match>,
1658        query: &SearchQuery,
1659        window: &mut Window,
1660        cx: &mut Context<Self>,
1661    ) {
1662        let text = self.buffer.read(cx);
1663        let text = text.snapshot(cx);
1664        let mut edits = vec![];
1665
1666        for m in matches {
1667            let text = text.text_for_range(m.clone()).collect::<Vec<_>>();
1668
1669            let text: Cow<_> = if text.len() == 1 {
1670                text.first().cloned().unwrap().into()
1671            } else {
1672                let joined_chunks = text.join("");
1673                joined_chunks.into()
1674            };
1675
1676            if let Some(replacement) = query.replacement_for(&text) {
1677                edits.push((m.clone(), Arc::from(&*replacement)));
1678            }
1679        }
1680
1681        if !edits.is_empty() {
1682            self.transact(window, cx, |this, _, cx| {
1683                this.edit(edits, cx);
1684            });
1685        }
1686    }
1687    fn match_index_for_direction(
1688        &mut self,
1689        matches: &[Range<Anchor>],
1690        current_index: usize,
1691        direction: Direction,
1692        count: usize,
1693        _: &mut Window,
1694        cx: &mut Context<Self>,
1695    ) -> usize {
1696        let buffer = self.buffer().read(cx).snapshot(cx);
1697        let current_index_position = if self.selections.disjoint_anchors_arc().len() == 1 {
1698            self.selections.newest_anchor().head()
1699        } else {
1700            matches[current_index].start
1701        };
1702
1703        let mut count = count % matches.len();
1704        if count == 0 {
1705            return current_index;
1706        }
1707        match direction {
1708            Direction::Next => {
1709                if matches[current_index]
1710                    .start
1711                    .cmp(&current_index_position, &buffer)
1712                    .is_gt()
1713                {
1714                    count -= 1
1715                }
1716
1717                (current_index + count) % matches.len()
1718            }
1719            Direction::Prev => {
1720                if matches[current_index]
1721                    .end
1722                    .cmp(&current_index_position, &buffer)
1723                    .is_lt()
1724                {
1725                    count -= 1;
1726                }
1727
1728                if current_index >= count {
1729                    current_index - count
1730                } else {
1731                    matches.len() - (count - current_index)
1732                }
1733            }
1734        }
1735    }
1736
1737    fn find_matches(
1738        &mut self,
1739        query: Arc<project::search::SearchQuery>,
1740        _: &mut Window,
1741        cx: &mut Context<Self>,
1742    ) -> Task<Vec<Range<Anchor>>> {
1743        let buffer = self.buffer().read(cx).snapshot(cx);
1744        let search_within_ranges = self
1745            .background_highlights
1746            .get(&HighlightKey::Type(TypeId::of::<SearchWithinRange>()))
1747            .map_or(vec![], |(_color, ranges)| {
1748                ranges.iter().cloned().collect::<Vec<_>>()
1749            });
1750
1751        cx.background_spawn(async move {
1752            let mut ranges = Vec::new();
1753
1754            let search_within_ranges = if search_within_ranges.is_empty() {
1755                vec![buffer.anchor_before(MultiBufferOffset(0))..buffer.anchor_after(buffer.len())]
1756            } else {
1757                search_within_ranges
1758            };
1759
1760            for range in search_within_ranges {
1761                for (search_buffer, search_range, excerpt_id, deleted_hunk_anchor) in
1762                    buffer.range_to_buffer_ranges_with_deleted_hunks(range)
1763                {
1764                    ranges.extend(
1765                        query
1766                            .search(
1767                                search_buffer,
1768                                Some(search_range.start.0..search_range.end.0),
1769                            )
1770                            .await
1771                            .into_iter()
1772                            .map(|match_range| {
1773                                if let Some(deleted_hunk_anchor) = deleted_hunk_anchor {
1774                                    let start = search_buffer
1775                                        .anchor_after(search_range.start + match_range.start);
1776                                    let end = search_buffer
1777                                        .anchor_before(search_range.start + match_range.end);
1778                                    deleted_hunk_anchor.with_diff_base_anchor(start)
1779                                        ..deleted_hunk_anchor.with_diff_base_anchor(end)
1780                                } else {
1781                                    let start = search_buffer
1782                                        .anchor_after(search_range.start + match_range.start);
1783                                    let end = search_buffer
1784                                        .anchor_before(search_range.start + match_range.end);
1785                                    Anchor::range_in_buffer(excerpt_id, start..end)
1786                                }
1787                            }),
1788                    );
1789                }
1790            }
1791
1792            ranges
1793        })
1794    }
1795
1796    fn active_match_index(
1797        &mut self,
1798        direction: Direction,
1799        matches: &[Range<Anchor>],
1800        _: &mut Window,
1801        cx: &mut Context<Self>,
1802    ) -> Option<usize> {
1803        active_match_index(
1804            direction,
1805            matches,
1806            &self.selections.newest_anchor().head(),
1807            &self.buffer().read(cx).snapshot(cx),
1808        )
1809    }
1810
1811    fn search_bar_visibility_changed(&mut self, _: bool, _: &mut Window, _: &mut Context<Self>) {
1812        self.expect_bounds_change = self.last_bounds;
1813    }
1814
1815    fn set_search_is_case_sensitive(
1816        &mut self,
1817        case_sensitive: Option<bool>,
1818        _cx: &mut Context<Self>,
1819    ) {
1820        self.select_next_is_case_sensitive = case_sensitive;
1821    }
1822}
1823
1824pub fn active_match_index(
1825    direction: Direction,
1826    ranges: &[Range<Anchor>],
1827    cursor: &Anchor,
1828    buffer: &MultiBufferSnapshot,
1829) -> Option<usize> {
1830    if ranges.is_empty() {
1831        None
1832    } else {
1833        let r = ranges.binary_search_by(|probe| {
1834            if probe.end.cmp(cursor, buffer).is_lt() {
1835                Ordering::Less
1836            } else if probe.start.cmp(cursor, buffer).is_gt() {
1837                Ordering::Greater
1838            } else {
1839                Ordering::Equal
1840            }
1841        });
1842        match direction {
1843            Direction::Prev => match r {
1844                Ok(i) => Some(i),
1845                Err(i) => Some(i.saturating_sub(1)),
1846            },
1847            Direction::Next => match r {
1848                Ok(i) | Err(i) => Some(cmp::min(i, ranges.len() - 1)),
1849            },
1850        }
1851    }
1852}
1853
1854pub fn entry_label_color(selected: bool) -> Color {
1855    if selected {
1856        Color::Default
1857    } else {
1858        Color::Muted
1859    }
1860}
1861
1862pub fn entry_diagnostic_aware_icon_name_and_color(
1863    diagnostic_severity: Option<DiagnosticSeverity>,
1864) -> Option<(IconName, Color)> {
1865    match diagnostic_severity {
1866        Some(DiagnosticSeverity::ERROR) => Some((IconName::Close, Color::Error)),
1867        Some(DiagnosticSeverity::WARNING) => Some((IconName::Triangle, Color::Warning)),
1868        _ => None,
1869    }
1870}
1871
1872pub fn entry_diagnostic_aware_icon_decoration_and_color(
1873    diagnostic_severity: Option<DiagnosticSeverity>,
1874) -> Option<(IconDecorationKind, Color)> {
1875    match diagnostic_severity {
1876        Some(DiagnosticSeverity::ERROR) => Some((IconDecorationKind::X, Color::Error)),
1877        Some(DiagnosticSeverity::WARNING) => Some((IconDecorationKind::Triangle, Color::Warning)),
1878        _ => None,
1879    }
1880}
1881
1882pub fn entry_git_aware_label_color(git_status: GitSummary, ignored: bool, selected: bool) -> Color {
1883    let tracked = git_status.index + git_status.worktree;
1884    if ignored {
1885        Color::Ignored
1886    } else if git_status.conflict > 0 {
1887        Color::Conflict
1888    } else if tracked.modified > 0 {
1889        Color::Modified
1890    } else if tracked.added > 0 || git_status.untracked > 0 {
1891        Color::Created
1892    } else {
1893        entry_label_color(selected)
1894    }
1895}
1896
1897fn path_for_buffer<'a>(
1898    buffer: &Entity<MultiBuffer>,
1899    height: usize,
1900    include_filename: bool,
1901    cx: &'a App,
1902) -> Option<Cow<'a, str>> {
1903    let file = buffer.read(cx).as_singleton()?.read(cx).file()?;
1904    path_for_file(file, height, include_filename, cx)
1905}
1906
1907fn path_for_file<'a>(
1908    file: &'a Arc<dyn language::File>,
1909    mut height: usize,
1910    include_filename: bool,
1911    cx: &'a App,
1912) -> Option<Cow<'a, str>> {
1913    if project::File::from_dyn(Some(file)).is_none() {
1914        return None;
1915    }
1916
1917    let file = file.as_ref();
1918    // Ensure we always render at least the filename.
1919    height += 1;
1920
1921    let mut prefix = file.path().as_ref();
1922    while height > 0 {
1923        if let Some(parent) = prefix.parent() {
1924            prefix = parent;
1925            height -= 1;
1926        } else {
1927            break;
1928        }
1929    }
1930
1931    // The full_path method allocates, so avoid calling it if height is zero.
1932    if height > 0 {
1933        let mut full_path = file.full_path(cx);
1934        if !include_filename {
1935            if !full_path.pop() {
1936                return None;
1937            }
1938        }
1939        Some(full_path.to_string_lossy().into_owned().into())
1940    } else {
1941        let mut path = file.path().strip_prefix(prefix).ok()?;
1942        if !include_filename {
1943            path = path.parent()?;
1944        }
1945        Some(path.display(file.path_style(cx)))
1946    }
1947}
1948
1949#[cfg(test)]
1950mod tests {
1951    use crate::editor_tests::init_test;
1952    use fs::Fs;
1953
1954    use super::*;
1955    use fs::MTime;
1956    use gpui::{App, VisualTestContext};
1957    use language::TestFile;
1958    use project::FakeFs;
1959    use std::path::{Path, PathBuf};
1960    use util::{path, rel_path::RelPath};
1961
1962    #[gpui::test]
1963    fn test_path_for_file(cx: &mut App) {
1964        let file: Arc<dyn language::File> = Arc::new(TestFile {
1965            path: RelPath::empty().into(),
1966            root_name: String::new(),
1967            local_root: None,
1968        });
1969        assert_eq!(path_for_file(&file, 0, false, cx), None);
1970    }
1971
1972    async fn deserialize_editor(
1973        item_id: ItemId,
1974        workspace_id: WorkspaceId,
1975        workspace: Entity<Workspace>,
1976        project: Entity<Project>,
1977        cx: &mut VisualTestContext,
1978    ) -> Entity<Editor> {
1979        workspace
1980            .update_in(cx, |workspace, window, cx| {
1981                let pane = workspace.active_pane();
1982                pane.update(cx, |_, cx| {
1983                    Editor::deserialize(
1984                        project.clone(),
1985                        workspace.weak_handle(),
1986                        workspace_id,
1987                        item_id,
1988                        window,
1989                        cx,
1990                    )
1991                })
1992            })
1993            .await
1994            .unwrap()
1995    }
1996
1997    #[gpui::test]
1998    async fn test_deserialize(cx: &mut gpui::TestAppContext) {
1999        init_test(cx, |_| {});
2000
2001        let fs = FakeFs::new(cx.executor());
2002        fs.insert_file(path!("/file.rs"), Default::default()).await;
2003
2004        // Test case 1: Deserialize with path and contents
2005        {
2006            let project = Project::test(fs.clone(), [path!("/file.rs").as_ref()], cx).await;
2007            let (workspace, cx) =
2008                cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
2009            let workspace_id = workspace::WORKSPACE_DB.next_id().await.unwrap();
2010            let item_id = 1234 as ItemId;
2011            let mtime = fs
2012                .metadata(Path::new(path!("/file.rs")))
2013                .await
2014                .unwrap()
2015                .unwrap()
2016                .mtime;
2017
2018            let serialized_editor = SerializedEditor {
2019                abs_path: Some(PathBuf::from(path!("/file.rs"))),
2020                contents: Some("fn main() {}".to_string()),
2021                language: Some("Rust".to_string()),
2022                mtime: Some(mtime),
2023            };
2024
2025            DB.save_serialized_editor(item_id, workspace_id, serialized_editor.clone())
2026                .await
2027                .unwrap();
2028
2029            let deserialized =
2030                deserialize_editor(item_id, workspace_id, workspace, project, cx).await;
2031
2032            deserialized.update(cx, |editor, cx| {
2033                assert_eq!(editor.text(cx), "fn main() {}");
2034                assert!(editor.is_dirty(cx));
2035                assert!(!editor.has_conflict(cx));
2036                let buffer = editor.buffer().read(cx).as_singleton().unwrap().read(cx);
2037                assert!(buffer.file().is_some());
2038            });
2039        }
2040
2041        // Test case 2: Deserialize with only path
2042        {
2043            let project = Project::test(fs.clone(), [path!("/file.rs").as_ref()], cx).await;
2044            let (workspace, cx) =
2045                cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
2046
2047            let workspace_id = workspace::WORKSPACE_DB.next_id().await.unwrap();
2048
2049            let item_id = 5678 as ItemId;
2050            let serialized_editor = SerializedEditor {
2051                abs_path: Some(PathBuf::from(path!("/file.rs"))),
2052                contents: None,
2053                language: None,
2054                mtime: None,
2055            };
2056
2057            DB.save_serialized_editor(item_id, workspace_id, serialized_editor)
2058                .await
2059                .unwrap();
2060
2061            let deserialized =
2062                deserialize_editor(item_id, workspace_id, workspace, project, cx).await;
2063
2064            deserialized.update(cx, |editor, cx| {
2065                assert_eq!(editor.text(cx), ""); // The file should be empty as per our initial setup
2066                assert!(!editor.is_dirty(cx));
2067                assert!(!editor.has_conflict(cx));
2068
2069                let buffer = editor.buffer().read(cx).as_singleton().unwrap().read(cx);
2070                assert!(buffer.file().is_some());
2071            });
2072        }
2073
2074        // Test case 3: Deserialize with no path (untitled buffer, with content and language)
2075        {
2076            let project = Project::test(fs.clone(), [path!("/file.rs").as_ref()], cx).await;
2077            // Add Rust to the language, so that we can restore the language of the buffer
2078            project.read_with(cx, |project, _| {
2079                project.languages().add(languages::rust_lang())
2080            });
2081
2082            let (workspace, cx) =
2083                cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
2084
2085            let workspace_id = workspace::WORKSPACE_DB.next_id().await.unwrap();
2086
2087            let item_id = 9012 as ItemId;
2088            let serialized_editor = SerializedEditor {
2089                abs_path: None,
2090                contents: Some("hello".to_string()),
2091                language: Some("Rust".to_string()),
2092                mtime: None,
2093            };
2094
2095            DB.save_serialized_editor(item_id, workspace_id, serialized_editor)
2096                .await
2097                .unwrap();
2098
2099            let deserialized =
2100                deserialize_editor(item_id, workspace_id, workspace, project, cx).await;
2101
2102            deserialized.update(cx, |editor, cx| {
2103                assert_eq!(editor.text(cx), "hello");
2104                assert!(editor.is_dirty(cx)); // The editor should be dirty for an untitled buffer
2105
2106                let buffer = editor.buffer().read(cx).as_singleton().unwrap().read(cx);
2107                assert_eq!(
2108                    buffer.language().map(|lang| lang.name()),
2109                    Some("Rust".into())
2110                ); // Language should be set to Rust
2111                assert!(buffer.file().is_none()); // The buffer should not have an associated file
2112            });
2113        }
2114
2115        // Test case 4: Deserialize with path, content, and old mtime
2116        {
2117            let project = Project::test(fs.clone(), [path!("/file.rs").as_ref()], cx).await;
2118            let (workspace, cx) =
2119                cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
2120
2121            let workspace_id = workspace::WORKSPACE_DB.next_id().await.unwrap();
2122
2123            let item_id = 9345 as ItemId;
2124            let old_mtime = MTime::from_seconds_and_nanos(0, 50);
2125            let serialized_editor = SerializedEditor {
2126                abs_path: Some(PathBuf::from(path!("/file.rs"))),
2127                contents: Some("fn main() {}".to_string()),
2128                language: Some("Rust".to_string()),
2129                mtime: Some(old_mtime),
2130            };
2131
2132            DB.save_serialized_editor(item_id, workspace_id, serialized_editor)
2133                .await
2134                .unwrap();
2135
2136            let deserialized =
2137                deserialize_editor(item_id, workspace_id, workspace, project, cx).await;
2138
2139            deserialized.update(cx, |editor, cx| {
2140                assert_eq!(editor.text(cx), "fn main() {}");
2141                assert!(editor.has_conflict(cx)); // The editor should have a conflict
2142            });
2143        }
2144
2145        // Test case 5: Deserialize with no path, no content, no language, and no old mtime (new, empty, unsaved buffer)
2146        {
2147            let project = Project::test(fs.clone(), [path!("/file.rs").as_ref()], cx).await;
2148            let (workspace, cx) =
2149                cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
2150
2151            let workspace_id = workspace::WORKSPACE_DB.next_id().await.unwrap();
2152
2153            let item_id = 10000 as ItemId;
2154            let serialized_editor = SerializedEditor {
2155                abs_path: None,
2156                contents: None,
2157                language: None,
2158                mtime: None,
2159            };
2160
2161            DB.save_serialized_editor(item_id, workspace_id, serialized_editor)
2162                .await
2163                .unwrap();
2164
2165            let deserialized =
2166                deserialize_editor(item_id, workspace_id, workspace, project, cx).await;
2167
2168            deserialized.update(cx, |editor, cx| {
2169                assert_eq!(editor.text(cx), "");
2170                assert!(!editor.is_dirty(cx));
2171                assert!(!editor.has_conflict(cx));
2172
2173                let buffer = editor.buffer().read(cx).as_singleton().unwrap().read(cx);
2174                assert!(buffer.file().is_none());
2175            });
2176        }
2177    }
2178}