1pub mod fs;
   2mod ignore;
   3mod lsp_command;
   4pub mod search;
   5pub mod worktree;
   6
   7use anyhow::{anyhow, Context, Result};
   8use client::{proto, Client, PeerId, TypedEnvelope, User, UserStore};
   9use clock::ReplicaId;
  10use collections::{hash_map, BTreeMap, HashMap, HashSet};
  11use futures::{future::Shared, Future, FutureExt, StreamExt, TryFutureExt};
  12use fuzzy::{PathMatch, PathMatchCandidate, PathMatchCandidateSet};
  13use gpui::{
  14    AnyModelHandle, AppContext, AsyncAppContext, Entity, ModelContext, ModelHandle,
  15    MutableAppContext, Task, UpgradeModelHandle, WeakModelHandle,
  16};
  17use language::{
  18    point_to_lsp,
  19    proto::{deserialize_anchor, deserialize_version, serialize_anchor, serialize_version},
  20    range_from_lsp, range_to_lsp, Anchor, Bias, Buffer, CodeAction, CodeLabel, Completion,
  21    Diagnostic, DiagnosticEntry, DiagnosticSet, Event as BufferEvent, File as _, Language,
  22    LanguageRegistry, LanguageServerName, LocalFile, LspAdapter, OffsetRangeExt, Operation, Patch,
  23    PointUtf16, TextBufferSnapshot, ToOffset, ToPointUtf16, Transaction,
  24};
  25use lsp::{DiagnosticSeverity, DiagnosticTag, DocumentHighlightKind, LanguageServer};
  26use lsp_command::*;
  27use parking_lot::Mutex;
  28use postage::watch;
  29use rand::prelude::*;
  30use search::SearchQuery;
  31use sha2::{Digest, Sha256};
  32use similar::{ChangeTag, TextDiff};
  33use std::{
  34    cell::RefCell,
  35    cmp::{self, Ordering},
  36    convert::TryInto,
  37    hash::Hash,
  38    mem,
  39    ops::Range,
  40    path::{Component, Path, PathBuf},
  41    rc::Rc,
  42    sync::{
  43        atomic::{AtomicBool, AtomicUsize, Ordering::SeqCst},
  44        Arc,
  45    },
  46    time::Instant,
  47};
  48use util::{post_inc, ResultExt, TryFutureExt as _};
  49
  50pub use fs::*;
  51pub use worktree::*;
  52
  53pub trait Item: Entity {
  54    fn entry_id(&self, cx: &AppContext) -> Option<ProjectEntryId>;
  55}
  56
  57pub struct Project {
  58    worktrees: Vec<WorktreeHandle>,
  59    active_entry: Option<ProjectEntryId>,
  60    languages: Arc<LanguageRegistry>,
  61    language_servers:
  62        HashMap<(WorktreeId, LanguageServerName), (Arc<dyn LspAdapter>, Arc<LanguageServer>)>,
  63    started_language_servers:
  64        HashMap<(WorktreeId, LanguageServerName), Task<Option<Arc<LanguageServer>>>>,
  65    language_server_statuses: BTreeMap<usize, LanguageServerStatus>,
  66    language_server_settings: Arc<Mutex<serde_json::Value>>,
  67    next_language_server_id: usize,
  68    client: Arc<client::Client>,
  69    next_entry_id: Arc<AtomicUsize>,
  70    user_store: ModelHandle<UserStore>,
  71    fs: Arc<dyn Fs>,
  72    client_state: ProjectClientState,
  73    collaborators: HashMap<PeerId, Collaborator>,
  74    subscriptions: Vec<client::Subscription>,
  75    language_servers_with_diagnostics_running: isize,
  76    opened_buffer: (Rc<RefCell<watch::Sender<()>>>, watch::Receiver<()>),
  77    shared_buffers: HashMap<PeerId, HashSet<u64>>,
  78    loading_buffers: HashMap<
  79        ProjectPath,
  80        postage::watch::Receiver<Option<Result<ModelHandle<Buffer>, Arc<anyhow::Error>>>>,
  81    >,
  82    loading_local_worktrees:
  83        HashMap<Arc<Path>, Shared<Task<Result<ModelHandle<Worktree>, Arc<anyhow::Error>>>>>,
  84    opened_buffers: HashMap<u64, OpenBuffer>,
  85    buffer_snapshots: HashMap<u64, Vec<(i32, TextBufferSnapshot)>>,
  86    nonce: u128,
  87}
  88
  89enum OpenBuffer {
  90    Strong(ModelHandle<Buffer>),
  91    Weak(WeakModelHandle<Buffer>),
  92    Loading(Vec<Operation>),
  93}
  94
  95enum WorktreeHandle {
  96    Strong(ModelHandle<Worktree>),
  97    Weak(WeakModelHandle<Worktree>),
  98}
  99
 100enum ProjectClientState {
 101    Local {
 102        is_shared: bool,
 103        remote_id_tx: watch::Sender<Option<u64>>,
 104        remote_id_rx: watch::Receiver<Option<u64>>,
 105        _maintain_remote_id_task: Task<Option<()>>,
 106    },
 107    Remote {
 108        sharing_has_stopped: bool,
 109        remote_id: u64,
 110        replica_id: ReplicaId,
 111        _detect_unshare_task: Task<Option<()>>,
 112    },
 113}
 114
 115#[derive(Clone, Debug)]
 116pub struct Collaborator {
 117    pub user: Arc<User>,
 118    pub peer_id: PeerId,
 119    pub replica_id: ReplicaId,
 120}
 121
 122#[derive(Clone, Debug, PartialEq)]
 123pub enum Event {
 124    ActiveEntryChanged(Option<ProjectEntryId>),
 125    WorktreeRemoved(WorktreeId),
 126    DiskBasedDiagnosticsStarted,
 127    DiskBasedDiagnosticsUpdated,
 128    DiskBasedDiagnosticsFinished,
 129    DiagnosticsUpdated(ProjectPath),
 130    RemoteIdChanged(Option<u64>),
 131    CollaboratorLeft(PeerId),
 132}
 133
 134enum LanguageServerEvent {
 135    WorkStart {
 136        token: String,
 137    },
 138    WorkProgress {
 139        token: String,
 140        progress: LanguageServerProgress,
 141    },
 142    WorkEnd {
 143        token: String,
 144    },
 145    DiagnosticsUpdate(lsp::PublishDiagnosticsParams),
 146}
 147
 148pub struct LanguageServerStatus {
 149    pub name: String,
 150    pub pending_work: BTreeMap<String, LanguageServerProgress>,
 151    pending_diagnostic_updates: isize,
 152}
 153
 154#[derive(Clone, Debug)]
 155pub struct LanguageServerProgress {
 156    pub message: Option<String>,
 157    pub percentage: Option<usize>,
 158    pub last_update_at: Instant,
 159}
 160
 161#[derive(Clone, Debug, Eq, PartialEq, Hash, PartialOrd, Ord)]
 162pub struct ProjectPath {
 163    pub worktree_id: WorktreeId,
 164    pub path: Arc<Path>,
 165}
 166
 167#[derive(Clone, Debug, Default, PartialEq)]
 168pub struct DiagnosticSummary {
 169    pub error_count: usize,
 170    pub warning_count: usize,
 171    pub info_count: usize,
 172    pub hint_count: usize,
 173}
 174
 175#[derive(Debug)]
 176pub struct Location {
 177    pub buffer: ModelHandle<Buffer>,
 178    pub range: Range<language::Anchor>,
 179}
 180
 181#[derive(Debug)]
 182pub struct DocumentHighlight {
 183    pub range: Range<language::Anchor>,
 184    pub kind: DocumentHighlightKind,
 185}
 186
 187#[derive(Clone, Debug)]
 188pub struct Symbol {
 189    pub source_worktree_id: WorktreeId,
 190    pub worktree_id: WorktreeId,
 191    pub language_server_name: LanguageServerName,
 192    pub path: PathBuf,
 193    pub label: CodeLabel,
 194    pub name: String,
 195    pub kind: lsp::SymbolKind,
 196    pub range: Range<PointUtf16>,
 197    pub signature: [u8; 32],
 198}
 199
 200#[derive(Default)]
 201pub struct ProjectTransaction(pub HashMap<ModelHandle<Buffer>, language::Transaction>);
 202
 203impl DiagnosticSummary {
 204    fn new<'a, T: 'a>(diagnostics: impl IntoIterator<Item = &'a DiagnosticEntry<T>>) -> Self {
 205        let mut this = Self {
 206            error_count: 0,
 207            warning_count: 0,
 208            info_count: 0,
 209            hint_count: 0,
 210        };
 211
 212        for entry in diagnostics {
 213            if entry.diagnostic.is_primary {
 214                match entry.diagnostic.severity {
 215                    DiagnosticSeverity::ERROR => this.error_count += 1,
 216                    DiagnosticSeverity::WARNING => this.warning_count += 1,
 217                    DiagnosticSeverity::INFORMATION => this.info_count += 1,
 218                    DiagnosticSeverity::HINT => this.hint_count += 1,
 219                    _ => {}
 220                }
 221            }
 222        }
 223
 224        this
 225    }
 226
 227    pub fn to_proto(&self, path: &Path) -> proto::DiagnosticSummary {
 228        proto::DiagnosticSummary {
 229            path: path.to_string_lossy().to_string(),
 230            error_count: self.error_count as u32,
 231            warning_count: self.warning_count as u32,
 232            info_count: self.info_count as u32,
 233            hint_count: self.hint_count as u32,
 234        }
 235    }
 236}
 237
 238#[derive(Clone, Copy, Debug, Default, Hash, PartialEq, Eq, PartialOrd, Ord)]
 239pub struct ProjectEntryId(usize);
 240
 241impl ProjectEntryId {
 242    pub fn new(counter: &AtomicUsize) -> Self {
 243        Self(counter.fetch_add(1, SeqCst))
 244    }
 245
 246    pub fn from_proto(id: u64) -> Self {
 247        Self(id as usize)
 248    }
 249
 250    pub fn to_proto(&self) -> u64 {
 251        self.0 as u64
 252    }
 253
 254    pub fn to_usize(&self) -> usize {
 255        self.0
 256    }
 257}
 258
 259impl Project {
 260    pub fn init(client: &Arc<Client>) {
 261        client.add_model_message_handler(Self::handle_add_collaborator);
 262        client.add_model_message_handler(Self::handle_buffer_reloaded);
 263        client.add_model_message_handler(Self::handle_buffer_saved);
 264        client.add_model_message_handler(Self::handle_start_language_server);
 265        client.add_model_message_handler(Self::handle_update_language_server);
 266        client.add_model_message_handler(Self::handle_remove_collaborator);
 267        client.add_model_message_handler(Self::handle_register_worktree);
 268        client.add_model_message_handler(Self::handle_unregister_worktree);
 269        client.add_model_message_handler(Self::handle_unshare_project);
 270        client.add_model_message_handler(Self::handle_update_buffer_file);
 271        client.add_model_message_handler(Self::handle_update_buffer);
 272        client.add_model_message_handler(Self::handle_update_diagnostic_summary);
 273        client.add_model_message_handler(Self::handle_update_worktree);
 274        client.add_model_request_handler(Self::handle_apply_additional_edits_for_completion);
 275        client.add_model_request_handler(Self::handle_apply_code_action);
 276        client.add_model_request_handler(Self::handle_format_buffers);
 277        client.add_model_request_handler(Self::handle_get_code_actions);
 278        client.add_model_request_handler(Self::handle_get_completions);
 279        client.add_model_request_handler(Self::handle_lsp_command::<GetDefinition>);
 280        client.add_model_request_handler(Self::handle_lsp_command::<GetDocumentHighlights>);
 281        client.add_model_request_handler(Self::handle_lsp_command::<GetReferences>);
 282        client.add_model_request_handler(Self::handle_lsp_command::<PrepareRename>);
 283        client.add_model_request_handler(Self::handle_lsp_command::<PerformRename>);
 284        client.add_model_request_handler(Self::handle_search_project);
 285        client.add_model_request_handler(Self::handle_get_project_symbols);
 286        client.add_model_request_handler(Self::handle_open_buffer_for_symbol);
 287        client.add_model_request_handler(Self::handle_open_buffer_by_id);
 288        client.add_model_request_handler(Self::handle_open_buffer_by_path);
 289        client.add_model_request_handler(Self::handle_save_buffer);
 290    }
 291
 292    pub fn local(
 293        client: Arc<Client>,
 294        user_store: ModelHandle<UserStore>,
 295        languages: Arc<LanguageRegistry>,
 296        fs: Arc<dyn Fs>,
 297        cx: &mut MutableAppContext,
 298    ) -> ModelHandle<Self> {
 299        cx.add_model(|cx: &mut ModelContext<Self>| {
 300            let (remote_id_tx, remote_id_rx) = watch::channel();
 301            let _maintain_remote_id_task = cx.spawn_weak({
 302                let rpc = client.clone();
 303                move |this, mut cx| {
 304                    async move {
 305                        let mut status = rpc.status();
 306                        while let Some(status) = status.next().await {
 307                            if let Some(this) = this.upgrade(&cx) {
 308                                if status.is_connected() {
 309                                    this.update(&mut cx, |this, cx| this.register(cx)).await?;
 310                                } else {
 311                                    this.update(&mut cx, |this, cx| this.unregister(cx));
 312                                }
 313                            }
 314                        }
 315                        Ok(())
 316                    }
 317                    .log_err()
 318                }
 319            });
 320
 321            let (opened_buffer_tx, opened_buffer_rx) = watch::channel();
 322            Self {
 323                worktrees: Default::default(),
 324                collaborators: Default::default(),
 325                opened_buffers: Default::default(),
 326                shared_buffers: Default::default(),
 327                loading_buffers: Default::default(),
 328                loading_local_worktrees: Default::default(),
 329                buffer_snapshots: Default::default(),
 330                client_state: ProjectClientState::Local {
 331                    is_shared: false,
 332                    remote_id_tx,
 333                    remote_id_rx,
 334                    _maintain_remote_id_task,
 335                },
 336                opened_buffer: (Rc::new(RefCell::new(opened_buffer_tx)), opened_buffer_rx),
 337                subscriptions: Vec::new(),
 338                active_entry: None,
 339                languages,
 340                client,
 341                user_store,
 342                fs,
 343                next_entry_id: Default::default(),
 344                language_servers_with_diagnostics_running: 0,
 345                language_servers: Default::default(),
 346                started_language_servers: Default::default(),
 347                language_server_statuses: Default::default(),
 348                language_server_settings: Default::default(),
 349                next_language_server_id: 0,
 350                nonce: StdRng::from_entropy().gen(),
 351            }
 352        })
 353    }
 354
 355    pub async fn remote(
 356        remote_id: u64,
 357        client: Arc<Client>,
 358        user_store: ModelHandle<UserStore>,
 359        languages: Arc<LanguageRegistry>,
 360        fs: Arc<dyn Fs>,
 361        cx: &mut AsyncAppContext,
 362    ) -> Result<ModelHandle<Self>> {
 363        client.authenticate_and_connect(true, &cx).await?;
 364
 365        let response = client
 366            .request(proto::JoinProject {
 367                project_id: remote_id,
 368            })
 369            .await?;
 370
 371        let replica_id = response.replica_id as ReplicaId;
 372
 373        let mut worktrees = Vec::new();
 374        for worktree in response.worktrees {
 375            let (worktree, load_task) = cx
 376                .update(|cx| Worktree::remote(remote_id, replica_id, worktree, client.clone(), cx));
 377            worktrees.push(worktree);
 378            load_task.detach();
 379        }
 380
 381        let (opened_buffer_tx, opened_buffer_rx) = watch::channel();
 382        let this = cx.add_model(|cx: &mut ModelContext<Self>| {
 383            let mut this = Self {
 384                worktrees: Vec::new(),
 385                loading_buffers: Default::default(),
 386                opened_buffer: (Rc::new(RefCell::new(opened_buffer_tx)), opened_buffer_rx),
 387                shared_buffers: Default::default(),
 388                loading_local_worktrees: Default::default(),
 389                active_entry: None,
 390                collaborators: Default::default(),
 391                languages,
 392                user_store: user_store.clone(),
 393                fs,
 394                next_entry_id: Default::default(),
 395                subscriptions: vec![client.add_model_for_remote_entity(remote_id, cx)],
 396                client: client.clone(),
 397                client_state: ProjectClientState::Remote {
 398                    sharing_has_stopped: false,
 399                    remote_id,
 400                    replica_id,
 401                    _detect_unshare_task: cx.spawn_weak(move |this, mut cx| {
 402                        async move {
 403                            let mut status = client.status();
 404                            let is_connected =
 405                                status.next().await.map_or(false, |s| s.is_connected());
 406                            // Even if we're initially connected, any future change of the status means we momentarily disconnected.
 407                            if !is_connected || status.next().await.is_some() {
 408                                if let Some(this) = this.upgrade(&cx) {
 409                                    this.update(&mut cx, |this, cx| this.project_unshared(cx))
 410                                }
 411                            }
 412                            Ok(())
 413                        }
 414                        .log_err()
 415                    }),
 416                },
 417                language_servers_with_diagnostics_running: 0,
 418                language_servers: Default::default(),
 419                started_language_servers: Default::default(),
 420                language_server_settings: Default::default(),
 421                language_server_statuses: response
 422                    .language_servers
 423                    .into_iter()
 424                    .map(|server| {
 425                        (
 426                            server.id as usize,
 427                            LanguageServerStatus {
 428                                name: server.name,
 429                                pending_work: Default::default(),
 430                                pending_diagnostic_updates: 0,
 431                            },
 432                        )
 433                    })
 434                    .collect(),
 435                next_language_server_id: 0,
 436                opened_buffers: Default::default(),
 437                buffer_snapshots: Default::default(),
 438                nonce: StdRng::from_entropy().gen(),
 439            };
 440            for worktree in worktrees {
 441                this.add_worktree(&worktree, cx);
 442            }
 443            this
 444        });
 445
 446        let user_ids = response
 447            .collaborators
 448            .iter()
 449            .map(|peer| peer.user_id)
 450            .collect();
 451        user_store
 452            .update(cx, |user_store, cx| user_store.load_users(user_ids, cx))
 453            .await?;
 454        let mut collaborators = HashMap::default();
 455        for message in response.collaborators {
 456            let collaborator = Collaborator::from_proto(message, &user_store, cx).await?;
 457            collaborators.insert(collaborator.peer_id, collaborator);
 458        }
 459
 460        this.update(cx, |this, _| {
 461            this.collaborators = collaborators;
 462        });
 463
 464        Ok(this)
 465    }
 466
 467    #[cfg(any(test, feature = "test-support"))]
 468    pub fn test(fs: Arc<dyn Fs>, cx: &mut gpui::TestAppContext) -> ModelHandle<Project> {
 469        let languages = Arc::new(LanguageRegistry::test());
 470        let http_client = client::test::FakeHttpClient::with_404_response();
 471        let client = client::Client::new(http_client.clone());
 472        let user_store = cx.add_model(|cx| UserStore::new(client.clone(), http_client, cx));
 473        cx.update(|cx| Project::local(client, user_store, languages, fs, cx))
 474    }
 475
 476    pub fn buffer_for_id(&self, remote_id: u64, cx: &AppContext) -> Option<ModelHandle<Buffer>> {
 477        self.opened_buffers
 478            .get(&remote_id)
 479            .and_then(|buffer| buffer.upgrade(cx))
 480    }
 481
 482    #[cfg(any(test, feature = "test-support"))]
 483    pub fn languages(&self) -> &Arc<LanguageRegistry> {
 484        &self.languages
 485    }
 486
 487    #[cfg(any(test, feature = "test-support"))]
 488    pub fn check_invariants(&self, cx: &AppContext) {
 489        if self.is_local() {
 490            let mut worktree_root_paths = HashMap::default();
 491            for worktree in self.worktrees(cx) {
 492                let worktree = worktree.read(cx);
 493                let abs_path = worktree.as_local().unwrap().abs_path().clone();
 494                let prev_worktree_id = worktree_root_paths.insert(abs_path.clone(), worktree.id());
 495                assert_eq!(
 496                    prev_worktree_id,
 497                    None,
 498                    "abs path {:?} for worktree {:?} is not unique ({:?} was already registered with the same path)",
 499                    abs_path,
 500                    worktree.id(),
 501                    prev_worktree_id
 502                )
 503            }
 504        } else {
 505            let replica_id = self.replica_id();
 506            for buffer in self.opened_buffers.values() {
 507                if let Some(buffer) = buffer.upgrade(cx) {
 508                    let buffer = buffer.read(cx);
 509                    assert_eq!(
 510                        buffer.deferred_ops_len(),
 511                        0,
 512                        "replica {}, buffer {} has deferred operations",
 513                        replica_id,
 514                        buffer.remote_id()
 515                    );
 516                }
 517            }
 518        }
 519    }
 520
 521    #[cfg(any(test, feature = "test-support"))]
 522    pub fn has_open_buffer(&self, path: impl Into<ProjectPath>, cx: &AppContext) -> bool {
 523        let path = path.into();
 524        if let Some(worktree) = self.worktree_for_id(path.worktree_id, cx) {
 525            self.opened_buffers.iter().any(|(_, buffer)| {
 526                if let Some(buffer) = buffer.upgrade(cx) {
 527                    if let Some(file) = File::from_dyn(buffer.read(cx).file()) {
 528                        if file.worktree == worktree && file.path() == &path.path {
 529                            return true;
 530                        }
 531                    }
 532                }
 533                false
 534            })
 535        } else {
 536            false
 537        }
 538    }
 539
 540    pub fn fs(&self) -> &Arc<dyn Fs> {
 541        &self.fs
 542    }
 543
 544    fn unregister(&mut self, cx: &mut ModelContext<Self>) {
 545        self.unshare(cx);
 546        for worktree in &self.worktrees {
 547            if let Some(worktree) = worktree.upgrade(cx) {
 548                worktree.update(cx, |worktree, _| {
 549                    worktree.as_local_mut().unwrap().unregister();
 550                });
 551            }
 552        }
 553
 554        if let ProjectClientState::Local { remote_id_tx, .. } = &mut self.client_state {
 555            *remote_id_tx.borrow_mut() = None;
 556        }
 557
 558        self.subscriptions.clear();
 559    }
 560
 561    fn register(&mut self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
 562        self.unregister(cx);
 563
 564        let response = self.client.request(proto::RegisterProject {});
 565        cx.spawn(|this, mut cx| async move {
 566            let remote_id = response.await?.project_id;
 567
 568            let mut registrations = Vec::new();
 569            this.update(&mut cx, |this, cx| {
 570                if let ProjectClientState::Local { remote_id_tx, .. } = &mut this.client_state {
 571                    *remote_id_tx.borrow_mut() = Some(remote_id);
 572                }
 573
 574                cx.emit(Event::RemoteIdChanged(Some(remote_id)));
 575
 576                this.subscriptions
 577                    .push(this.client.add_model_for_remote_entity(remote_id, cx));
 578
 579                for worktree in &this.worktrees {
 580                    if let Some(worktree) = worktree.upgrade(cx) {
 581                        registrations.push(worktree.update(cx, |worktree, cx| {
 582                            let worktree = worktree.as_local_mut().unwrap();
 583                            worktree.register(remote_id, cx)
 584                        }));
 585                    }
 586                }
 587            });
 588
 589            futures::future::try_join_all(registrations).await?;
 590            Ok(())
 591        })
 592    }
 593
 594    pub fn remote_id(&self) -> Option<u64> {
 595        match &self.client_state {
 596            ProjectClientState::Local { remote_id_rx, .. } => *remote_id_rx.borrow(),
 597            ProjectClientState::Remote { remote_id, .. } => Some(*remote_id),
 598        }
 599    }
 600
 601    pub fn next_remote_id(&self) -> impl Future<Output = u64> {
 602        let mut id = None;
 603        let mut watch = None;
 604        match &self.client_state {
 605            ProjectClientState::Local { remote_id_rx, .. } => watch = Some(remote_id_rx.clone()),
 606            ProjectClientState::Remote { remote_id, .. } => id = Some(*remote_id),
 607        }
 608
 609        async move {
 610            if let Some(id) = id {
 611                return id;
 612            }
 613            let mut watch = watch.unwrap();
 614            loop {
 615                let id = *watch.borrow();
 616                if let Some(id) = id {
 617                    return id;
 618                }
 619                watch.next().await;
 620            }
 621        }
 622    }
 623
 624    pub fn replica_id(&self) -> ReplicaId {
 625        match &self.client_state {
 626            ProjectClientState::Local { .. } => 0,
 627            ProjectClientState::Remote { replica_id, .. } => *replica_id,
 628        }
 629    }
 630
 631    pub fn collaborators(&self) -> &HashMap<PeerId, Collaborator> {
 632        &self.collaborators
 633    }
 634
 635    pub fn worktrees<'a>(
 636        &'a self,
 637        cx: &'a AppContext,
 638    ) -> impl 'a + Iterator<Item = ModelHandle<Worktree>> {
 639        self.worktrees
 640            .iter()
 641            .filter_map(move |worktree| worktree.upgrade(cx))
 642    }
 643
 644    pub fn visible_worktrees<'a>(
 645        &'a self,
 646        cx: &'a AppContext,
 647    ) -> impl 'a + Iterator<Item = ModelHandle<Worktree>> {
 648        self.worktrees.iter().filter_map(|worktree| {
 649            worktree.upgrade(cx).and_then(|worktree| {
 650                if worktree.read(cx).is_visible() {
 651                    Some(worktree)
 652                } else {
 653                    None
 654                }
 655            })
 656        })
 657    }
 658
 659    pub fn worktree_for_id(
 660        &self,
 661        id: WorktreeId,
 662        cx: &AppContext,
 663    ) -> Option<ModelHandle<Worktree>> {
 664        self.worktrees(cx)
 665            .find(|worktree| worktree.read(cx).id() == id)
 666    }
 667
 668    pub fn worktree_for_entry(
 669        &self,
 670        entry_id: ProjectEntryId,
 671        cx: &AppContext,
 672    ) -> Option<ModelHandle<Worktree>> {
 673        self.worktrees(cx)
 674            .find(|worktree| worktree.read(cx).contains_entry(entry_id))
 675    }
 676
 677    pub fn worktree_id_for_entry(
 678        &self,
 679        entry_id: ProjectEntryId,
 680        cx: &AppContext,
 681    ) -> Option<WorktreeId> {
 682        self.worktree_for_entry(entry_id, cx)
 683            .map(|worktree| worktree.read(cx).id())
 684    }
 685
 686    pub fn share(&self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
 687        let rpc = self.client.clone();
 688        cx.spawn(|this, mut cx| async move {
 689            let project_id = this.update(&mut cx, |this, cx| {
 690                if let ProjectClientState::Local {
 691                    is_shared,
 692                    remote_id_rx,
 693                    ..
 694                } = &mut this.client_state
 695                {
 696                    *is_shared = true;
 697
 698                    for open_buffer in this.opened_buffers.values_mut() {
 699                        match open_buffer {
 700                            OpenBuffer::Strong(_) => {}
 701                            OpenBuffer::Weak(buffer) => {
 702                                if let Some(buffer) = buffer.upgrade(cx) {
 703                                    *open_buffer = OpenBuffer::Strong(buffer);
 704                                }
 705                            }
 706                            OpenBuffer::Loading(_) => unreachable!(),
 707                        }
 708                    }
 709
 710                    for worktree_handle in this.worktrees.iter_mut() {
 711                        match worktree_handle {
 712                            WorktreeHandle::Strong(_) => {}
 713                            WorktreeHandle::Weak(worktree) => {
 714                                if let Some(worktree) = worktree.upgrade(cx) {
 715                                    *worktree_handle = WorktreeHandle::Strong(worktree);
 716                                }
 717                            }
 718                        }
 719                    }
 720
 721                    remote_id_rx
 722                        .borrow()
 723                        .ok_or_else(|| anyhow!("no project id"))
 724                } else {
 725                    Err(anyhow!("can't share a remote project"))
 726                }
 727            })?;
 728
 729            rpc.request(proto::ShareProject { project_id }).await?;
 730
 731            let mut tasks = Vec::new();
 732            this.update(&mut cx, |this, cx| {
 733                for worktree in this.worktrees(cx).collect::<Vec<_>>() {
 734                    worktree.update(cx, |worktree, cx| {
 735                        let worktree = worktree.as_local_mut().unwrap();
 736                        tasks.push(worktree.share(project_id, cx));
 737                    });
 738                }
 739            });
 740            for task in tasks {
 741                task.await?;
 742            }
 743            this.update(&mut cx, |_, cx| cx.notify());
 744            Ok(())
 745        })
 746    }
 747
 748    pub fn unshare(&mut self, cx: &mut ModelContext<Self>) {
 749        let rpc = self.client.clone();
 750
 751        if let ProjectClientState::Local {
 752            is_shared,
 753            remote_id_rx,
 754            ..
 755        } = &mut self.client_state
 756        {
 757            if !*is_shared {
 758                return;
 759            }
 760
 761            *is_shared = false;
 762            self.collaborators.clear();
 763            self.shared_buffers.clear();
 764            for worktree_handle in self.worktrees.iter_mut() {
 765                if let WorktreeHandle::Strong(worktree) = worktree_handle {
 766                    let is_visible = worktree.update(cx, |worktree, _| {
 767                        worktree.as_local_mut().unwrap().unshare();
 768                        worktree.is_visible()
 769                    });
 770                    if !is_visible {
 771                        *worktree_handle = WorktreeHandle::Weak(worktree.downgrade());
 772                    }
 773                }
 774            }
 775
 776            for open_buffer in self.opened_buffers.values_mut() {
 777                match open_buffer {
 778                    OpenBuffer::Strong(buffer) => {
 779                        *open_buffer = OpenBuffer::Weak(buffer.downgrade());
 780                    }
 781                    _ => {}
 782                }
 783            }
 784
 785            if let Some(project_id) = *remote_id_rx.borrow() {
 786                rpc.send(proto::UnshareProject { project_id }).log_err();
 787            }
 788
 789            cx.notify();
 790        } else {
 791            log::error!("attempted to unshare a remote project");
 792        }
 793    }
 794
 795    fn project_unshared(&mut self, cx: &mut ModelContext<Self>) {
 796        if let ProjectClientState::Remote {
 797            sharing_has_stopped,
 798            ..
 799        } = &mut self.client_state
 800        {
 801            *sharing_has_stopped = true;
 802            self.collaborators.clear();
 803            cx.notify();
 804        }
 805    }
 806
 807    pub fn is_read_only(&self) -> bool {
 808        match &self.client_state {
 809            ProjectClientState::Local { .. } => false,
 810            ProjectClientState::Remote {
 811                sharing_has_stopped,
 812                ..
 813            } => *sharing_has_stopped,
 814        }
 815    }
 816
 817    pub fn is_local(&self) -> bool {
 818        match &self.client_state {
 819            ProjectClientState::Local { .. } => true,
 820            ProjectClientState::Remote { .. } => false,
 821        }
 822    }
 823
 824    pub fn is_remote(&self) -> bool {
 825        !self.is_local()
 826    }
 827
 828    pub fn create_buffer(&mut self, cx: &mut ModelContext<Self>) -> Result<ModelHandle<Buffer>> {
 829        if self.is_remote() {
 830            return Err(anyhow!("creating buffers as a guest is not supported yet"));
 831        }
 832
 833        let buffer = cx.add_model(|cx| {
 834            Buffer::new(self.replica_id(), "", cx).with_language(language::PLAIN_TEXT.clone(), cx)
 835        });
 836        self.register_buffer(&buffer, cx)?;
 837        Ok(buffer)
 838    }
 839
 840    pub fn open_path(
 841        &mut self,
 842        path: impl Into<ProjectPath>,
 843        cx: &mut ModelContext<Self>,
 844    ) -> Task<Result<(ProjectEntryId, AnyModelHandle)>> {
 845        let task = self.open_buffer(path, cx);
 846        cx.spawn_weak(|_, cx| async move {
 847            let buffer = task.await?;
 848            let project_entry_id = buffer
 849                .read_with(&cx, |buffer, cx| {
 850                    File::from_dyn(buffer.file()).and_then(|file| file.project_entry_id(cx))
 851                })
 852                .ok_or_else(|| anyhow!("no project entry"))?;
 853            Ok((project_entry_id, buffer.into()))
 854        })
 855    }
 856
 857    pub fn open_buffer(
 858        &mut self,
 859        path: impl Into<ProjectPath>,
 860        cx: &mut ModelContext<Self>,
 861    ) -> Task<Result<ModelHandle<Buffer>>> {
 862        let project_path = path.into();
 863        let worktree = if let Some(worktree) = self.worktree_for_id(project_path.worktree_id, cx) {
 864            worktree
 865        } else {
 866            return Task::ready(Err(anyhow!("no such worktree")));
 867        };
 868
 869        // If there is already a buffer for the given path, then return it.
 870        let existing_buffer = self.get_open_buffer(&project_path, cx);
 871        if let Some(existing_buffer) = existing_buffer {
 872            return Task::ready(Ok(existing_buffer));
 873        }
 874
 875        let mut loading_watch = match self.loading_buffers.entry(project_path.clone()) {
 876            // If the given path is already being loaded, then wait for that existing
 877            // task to complete and return the same buffer.
 878            hash_map::Entry::Occupied(e) => e.get().clone(),
 879
 880            // Otherwise, record the fact that this path is now being loaded.
 881            hash_map::Entry::Vacant(entry) => {
 882                let (mut tx, rx) = postage::watch::channel();
 883                entry.insert(rx.clone());
 884
 885                let load_buffer = if worktree.read(cx).is_local() {
 886                    self.open_local_buffer(&project_path.path, &worktree, cx)
 887                } else {
 888                    self.open_remote_buffer(&project_path.path, &worktree, cx)
 889                };
 890
 891                cx.spawn(move |this, mut cx| async move {
 892                    let load_result = load_buffer.await;
 893                    *tx.borrow_mut() = Some(this.update(&mut cx, |this, _| {
 894                        // Record the fact that the buffer is no longer loading.
 895                        this.loading_buffers.remove(&project_path);
 896                        let buffer = load_result.map_err(Arc::new)?;
 897                        Ok(buffer)
 898                    }));
 899                })
 900                .detach();
 901                rx
 902            }
 903        };
 904
 905        cx.foreground().spawn(async move {
 906            loop {
 907                if let Some(result) = loading_watch.borrow().as_ref() {
 908                    match result {
 909                        Ok(buffer) => return Ok(buffer.clone()),
 910                        Err(error) => return Err(anyhow!("{}", error)),
 911                    }
 912                }
 913                loading_watch.next().await;
 914            }
 915        })
 916    }
 917
 918    fn open_local_buffer(
 919        &mut self,
 920        path: &Arc<Path>,
 921        worktree: &ModelHandle<Worktree>,
 922        cx: &mut ModelContext<Self>,
 923    ) -> Task<Result<ModelHandle<Buffer>>> {
 924        let load_buffer = worktree.update(cx, |worktree, cx| {
 925            let worktree = worktree.as_local_mut().unwrap();
 926            worktree.load_buffer(path, cx)
 927        });
 928        cx.spawn(|this, mut cx| async move {
 929            let buffer = load_buffer.await?;
 930            this.update(&mut cx, |this, cx| this.register_buffer(&buffer, cx))?;
 931            Ok(buffer)
 932        })
 933    }
 934
 935    fn open_remote_buffer(
 936        &mut self,
 937        path: &Arc<Path>,
 938        worktree: &ModelHandle<Worktree>,
 939        cx: &mut ModelContext<Self>,
 940    ) -> Task<Result<ModelHandle<Buffer>>> {
 941        let rpc = self.client.clone();
 942        let project_id = self.remote_id().unwrap();
 943        let remote_worktree_id = worktree.read(cx).id();
 944        let path = path.clone();
 945        let path_string = path.to_string_lossy().to_string();
 946        cx.spawn(|this, mut cx| async move {
 947            let response = rpc
 948                .request(proto::OpenBufferByPath {
 949                    project_id,
 950                    worktree_id: remote_worktree_id.to_proto(),
 951                    path: path_string,
 952                })
 953                .await?;
 954            let buffer = response.buffer.ok_or_else(|| anyhow!("missing buffer"))?;
 955            this.update(&mut cx, |this, cx| this.deserialize_buffer(buffer, cx))
 956                .await
 957        })
 958    }
 959
 960    fn open_local_buffer_via_lsp(
 961        &mut self,
 962        abs_path: lsp::Url,
 963        lsp_adapter: Arc<dyn LspAdapter>,
 964        lsp_server: Arc<LanguageServer>,
 965        cx: &mut ModelContext<Self>,
 966    ) -> Task<Result<ModelHandle<Buffer>>> {
 967        cx.spawn(|this, mut cx| async move {
 968            let abs_path = abs_path
 969                .to_file_path()
 970                .map_err(|_| anyhow!("can't convert URI to path"))?;
 971            let (worktree, relative_path) = if let Some(result) =
 972                this.read_with(&cx, |this, cx| this.find_local_worktree(&abs_path, cx))
 973            {
 974                result
 975            } else {
 976                let worktree = this
 977                    .update(&mut cx, |this, cx| {
 978                        this.create_local_worktree(&abs_path, false, cx)
 979                    })
 980                    .await?;
 981                this.update(&mut cx, |this, cx| {
 982                    this.language_servers.insert(
 983                        (worktree.read(cx).id(), lsp_adapter.name()),
 984                        (lsp_adapter, lsp_server),
 985                    );
 986                });
 987                (worktree, PathBuf::new())
 988            };
 989
 990            let project_path = ProjectPath {
 991                worktree_id: worktree.read_with(&cx, |worktree, _| worktree.id()),
 992                path: relative_path.into(),
 993            };
 994            this.update(&mut cx, |this, cx| this.open_buffer(project_path, cx))
 995                .await
 996        })
 997    }
 998
 999    pub fn open_buffer_by_id(
1000        &mut self,
1001        id: u64,
1002        cx: &mut ModelContext<Self>,
1003    ) -> Task<Result<ModelHandle<Buffer>>> {
1004        if let Some(buffer) = self.buffer_for_id(id, cx) {
1005            Task::ready(Ok(buffer))
1006        } else if self.is_local() {
1007            Task::ready(Err(anyhow!("buffer {} does not exist", id)))
1008        } else if let Some(project_id) = self.remote_id() {
1009            let request = self
1010                .client
1011                .request(proto::OpenBufferById { project_id, id });
1012            cx.spawn(|this, mut cx| async move {
1013                let buffer = request
1014                    .await?
1015                    .buffer
1016                    .ok_or_else(|| anyhow!("invalid buffer"))?;
1017                this.update(&mut cx, |this, cx| this.deserialize_buffer(buffer, cx))
1018                    .await
1019            })
1020        } else {
1021            Task::ready(Err(anyhow!("cannot open buffer while disconnected")))
1022        }
1023    }
1024
1025    pub fn save_buffer_as(
1026        &mut self,
1027        buffer: ModelHandle<Buffer>,
1028        abs_path: PathBuf,
1029        cx: &mut ModelContext<Project>,
1030    ) -> Task<Result<()>> {
1031        let worktree_task = self.find_or_create_local_worktree(&abs_path, true, cx);
1032        cx.spawn(|this, mut cx| async move {
1033            let (worktree, path) = worktree_task.await?;
1034            worktree
1035                .update(&mut cx, |worktree, cx| {
1036                    worktree
1037                        .as_local_mut()
1038                        .unwrap()
1039                        .save_buffer_as(buffer.clone(), path, cx)
1040                })
1041                .await?;
1042            this.update(&mut cx, |this, cx| {
1043                this.assign_language_to_buffer(&buffer, cx);
1044                this.register_buffer_with_language_server(&buffer, cx);
1045            });
1046            Ok(())
1047        })
1048    }
1049
1050    pub fn get_open_buffer(
1051        &mut self,
1052        path: &ProjectPath,
1053        cx: &mut ModelContext<Self>,
1054    ) -> Option<ModelHandle<Buffer>> {
1055        let worktree = self.worktree_for_id(path.worktree_id, cx)?;
1056        self.opened_buffers.values().find_map(|buffer| {
1057            let buffer = buffer.upgrade(cx)?;
1058            let file = File::from_dyn(buffer.read(cx).file())?;
1059            if file.worktree == worktree && file.path() == &path.path {
1060                Some(buffer)
1061            } else {
1062                None
1063            }
1064        })
1065    }
1066
1067    fn register_buffer(
1068        &mut self,
1069        buffer: &ModelHandle<Buffer>,
1070        cx: &mut ModelContext<Self>,
1071    ) -> Result<()> {
1072        let remote_id = buffer.read(cx).remote_id();
1073        let open_buffer = if self.is_remote() || self.is_shared() {
1074            OpenBuffer::Strong(buffer.clone())
1075        } else {
1076            OpenBuffer::Weak(buffer.downgrade())
1077        };
1078
1079        match self.opened_buffers.insert(remote_id, open_buffer) {
1080            None => {}
1081            Some(OpenBuffer::Loading(operations)) => {
1082                buffer.update(cx, |buffer, cx| buffer.apply_ops(operations, cx))?
1083            }
1084            Some(OpenBuffer::Weak(existing_handle)) => {
1085                if existing_handle.upgrade(cx).is_some() {
1086                    Err(anyhow!(
1087                        "already registered buffer with remote id {}",
1088                        remote_id
1089                    ))?
1090                }
1091            }
1092            Some(OpenBuffer::Strong(_)) => Err(anyhow!(
1093                "already registered buffer with remote id {}",
1094                remote_id
1095            ))?,
1096        }
1097        cx.subscribe(buffer, |this, buffer, event, cx| {
1098            this.on_buffer_event(buffer, event, cx);
1099        })
1100        .detach();
1101
1102        self.assign_language_to_buffer(buffer, cx);
1103        self.register_buffer_with_language_server(buffer, cx);
1104
1105        Ok(())
1106    }
1107
1108    fn register_buffer_with_language_server(
1109        &mut self,
1110        buffer_handle: &ModelHandle<Buffer>,
1111        cx: &mut ModelContext<Self>,
1112    ) {
1113        let buffer = buffer_handle.read(cx);
1114        let buffer_id = buffer.remote_id();
1115        if let Some(file) = File::from_dyn(buffer.file()) {
1116            if file.is_local() {
1117                let uri = lsp::Url::from_file_path(file.abs_path(cx)).unwrap();
1118                let initial_snapshot = buffer.text_snapshot();
1119                let language_server = self.language_server_for_buffer(buffer, cx).cloned();
1120
1121                if let Some(local_worktree) = file.worktree.read(cx).as_local() {
1122                    if let Some(diagnostics) = local_worktree.diagnostics_for_path(file.path()) {
1123                        self.update_buffer_diagnostics(&buffer_handle, diagnostics, None, cx)
1124                            .log_err();
1125                    }
1126                }
1127
1128                if let Some((_, server)) = language_server {
1129                    server
1130                        .notify::<lsp::notification::DidOpenTextDocument>(
1131                            lsp::DidOpenTextDocumentParams {
1132                                text_document: lsp::TextDocumentItem::new(
1133                                    uri,
1134                                    Default::default(),
1135                                    0,
1136                                    initial_snapshot.text(),
1137                                ),
1138                            }
1139                            .clone(),
1140                        )
1141                        .log_err();
1142                    buffer_handle.update(cx, |buffer, cx| {
1143                        buffer.set_completion_triggers(
1144                            server
1145                                .capabilities()
1146                                .completion_provider
1147                                .as_ref()
1148                                .and_then(|provider| provider.trigger_characters.clone())
1149                                .unwrap_or(Vec::new()),
1150                            cx,
1151                        )
1152                    });
1153                    self.buffer_snapshots
1154                        .insert(buffer_id, vec![(0, initial_snapshot)]);
1155                }
1156
1157                cx.observe_release(buffer_handle, |this, buffer, cx| {
1158                    if let Some(file) = File::from_dyn(buffer.file()) {
1159                        if file.is_local() {
1160                            let uri = lsp::Url::from_file_path(file.abs_path(cx)).unwrap();
1161                            if let Some((_, server)) = this.language_server_for_buffer(buffer, cx) {
1162                                server
1163                                    .notify::<lsp::notification::DidCloseTextDocument>(
1164                                        lsp::DidCloseTextDocumentParams {
1165                                            text_document: lsp::TextDocumentIdentifier::new(
1166                                                uri.clone(),
1167                                            ),
1168                                        },
1169                                    )
1170                                    .log_err();
1171                            }
1172                        }
1173                    }
1174                })
1175                .detach();
1176            }
1177        }
1178    }
1179
1180    fn on_buffer_event(
1181        &mut self,
1182        buffer: ModelHandle<Buffer>,
1183        event: &BufferEvent,
1184        cx: &mut ModelContext<Self>,
1185    ) -> Option<()> {
1186        match event {
1187            BufferEvent::Operation(operation) => {
1188                let project_id = self.remote_id()?;
1189                let request = self.client.request(proto::UpdateBuffer {
1190                    project_id,
1191                    buffer_id: buffer.read(cx).remote_id(),
1192                    operations: vec![language::proto::serialize_operation(&operation)],
1193                });
1194                cx.background().spawn(request).detach_and_log_err(cx);
1195            }
1196            BufferEvent::Edited { .. } => {
1197                let (_, language_server) = self
1198                    .language_server_for_buffer(buffer.read(cx), cx)?
1199                    .clone();
1200                let buffer = buffer.read(cx);
1201                let file = File::from_dyn(buffer.file())?;
1202                let abs_path = file.as_local()?.abs_path(cx);
1203                let uri = lsp::Url::from_file_path(abs_path).unwrap();
1204                let buffer_snapshots = self.buffer_snapshots.entry(buffer.remote_id()).or_default();
1205                let (version, prev_snapshot) = buffer_snapshots.last()?;
1206                let next_snapshot = buffer.text_snapshot();
1207                let next_version = version + 1;
1208
1209                let content_changes = buffer
1210                    .edits_since::<(PointUtf16, usize)>(prev_snapshot.version())
1211                    .map(|edit| {
1212                        let edit_start = edit.new.start.0;
1213                        let edit_end = edit_start + (edit.old.end.0 - edit.old.start.0);
1214                        let new_text = next_snapshot
1215                            .text_for_range(edit.new.start.1..edit.new.end.1)
1216                            .collect();
1217                        lsp::TextDocumentContentChangeEvent {
1218                            range: Some(lsp::Range::new(
1219                                point_to_lsp(edit_start),
1220                                point_to_lsp(edit_end),
1221                            )),
1222                            range_length: None,
1223                            text: new_text,
1224                        }
1225                    })
1226                    .collect();
1227
1228                buffer_snapshots.push((next_version, next_snapshot));
1229
1230                language_server
1231                    .notify::<lsp::notification::DidChangeTextDocument>(
1232                        lsp::DidChangeTextDocumentParams {
1233                            text_document: lsp::VersionedTextDocumentIdentifier::new(
1234                                uri,
1235                                next_version,
1236                            ),
1237                            content_changes,
1238                        },
1239                    )
1240                    .log_err();
1241            }
1242            BufferEvent::Saved => {
1243                let file = File::from_dyn(buffer.read(cx).file())?;
1244                let worktree_id = file.worktree_id(cx);
1245                let abs_path = file.as_local()?.abs_path(cx);
1246                let text_document = lsp::TextDocumentIdentifier {
1247                    uri: lsp::Url::from_file_path(abs_path).unwrap(),
1248                };
1249
1250                for (_, server) in self.language_servers_for_worktree(worktree_id) {
1251                    server
1252                        .notify::<lsp::notification::DidSaveTextDocument>(
1253                            lsp::DidSaveTextDocumentParams {
1254                                text_document: text_document.clone(),
1255                                text: None,
1256                            },
1257                        )
1258                        .log_err();
1259                }
1260            }
1261            _ => {}
1262        }
1263
1264        None
1265    }
1266
1267    fn language_servers_for_worktree(
1268        &self,
1269        worktree_id: WorktreeId,
1270    ) -> impl Iterator<Item = &(Arc<dyn LspAdapter>, Arc<LanguageServer>)> {
1271        self.language_servers.iter().filter_map(
1272            move |((language_server_worktree_id, _), server)| {
1273                if *language_server_worktree_id == worktree_id {
1274                    Some(server)
1275                } else {
1276                    None
1277                }
1278            },
1279        )
1280    }
1281
1282    fn assign_language_to_buffer(
1283        &mut self,
1284        buffer: &ModelHandle<Buffer>,
1285        cx: &mut ModelContext<Self>,
1286    ) -> Option<()> {
1287        // If the buffer has a language, set it and start the language server if we haven't already.
1288        let full_path = buffer.read(cx).file()?.full_path(cx);
1289        let language = self.languages.select_language(&full_path)?;
1290        buffer.update(cx, |buffer, cx| {
1291            buffer.set_language(Some(language.clone()), cx);
1292        });
1293
1294        let file = File::from_dyn(buffer.read(cx).file())?;
1295        let worktree = file.worktree.read(cx).as_local()?;
1296        let worktree_id = worktree.id();
1297        let worktree_abs_path = worktree.abs_path().clone();
1298        self.start_language_server(worktree_id, worktree_abs_path, language, cx);
1299
1300        None
1301    }
1302
1303    fn start_language_server(
1304        &mut self,
1305        worktree_id: WorktreeId,
1306        worktree_path: Arc<Path>,
1307        language: Arc<Language>,
1308        cx: &mut ModelContext<Self>,
1309    ) {
1310        let adapter = if let Some(adapter) = language.lsp_adapter() {
1311            adapter
1312        } else {
1313            return;
1314        };
1315        let key = (worktree_id, adapter.name());
1316        self.started_language_servers
1317            .entry(key.clone())
1318            .or_insert_with(|| {
1319                let server_id = post_inc(&mut self.next_language_server_id);
1320                let language_server = self.languages.start_language_server(
1321                    server_id,
1322                    language.clone(),
1323                    worktree_path,
1324                    self.client.http_client(),
1325                    cx,
1326                );
1327                cx.spawn_weak(|this, mut cx| async move {
1328                    let language_server = language_server?.await.log_err()?;
1329                    let this = this.upgrade(&cx)?;
1330                    let (language_server_events_tx, language_server_events_rx) =
1331                        smol::channel::unbounded();
1332
1333                    language_server
1334                        .on_notification::<lsp::notification::PublishDiagnostics, _>({
1335                            let language_server_events_tx = language_server_events_tx.clone();
1336                            move |params, _| {
1337                                language_server_events_tx
1338                                    .try_send(LanguageServerEvent::DiagnosticsUpdate(params))
1339                                    .ok();
1340                            }
1341                        })
1342                        .detach();
1343
1344                    language_server
1345                        .on_request::<lsp::request::WorkspaceConfiguration, _, _>({
1346                            let settings = this
1347                                .read_with(&cx, |this, _| this.language_server_settings.clone());
1348                            move |params, _| {
1349                                let settings = settings.lock().clone();
1350                                async move {
1351                                    Ok(params
1352                                        .items
1353                                        .into_iter()
1354                                        .map(|item| {
1355                                            if let Some(section) = &item.section {
1356                                                settings
1357                                                    .get(section)
1358                                                    .cloned()
1359                                                    .unwrap_or(serde_json::Value::Null)
1360                                            } else {
1361                                                settings.clone()
1362                                            }
1363                                        })
1364                                        .collect())
1365                                }
1366                            }
1367                        })
1368                        .detach();
1369
1370                    language_server
1371                        .on_notification::<lsp::notification::Progress, _>(move |params, _| {
1372                            let token = match params.token {
1373                                lsp::NumberOrString::String(token) => token,
1374                                lsp::NumberOrString::Number(token) => {
1375                                    log::info!("skipping numeric progress token {}", token);
1376                                    return;
1377                                }
1378                            };
1379
1380                            match params.value {
1381                                lsp::ProgressParamsValue::WorkDone(progress) => match progress {
1382                                    lsp::WorkDoneProgress::Begin(_) => {
1383                                        language_server_events_tx
1384                                            .try_send(LanguageServerEvent::WorkStart { token })
1385                                            .ok();
1386                                    }
1387                                    lsp::WorkDoneProgress::Report(report) => {
1388                                        language_server_events_tx
1389                                            .try_send(LanguageServerEvent::WorkProgress {
1390                                                token,
1391                                                progress: LanguageServerProgress {
1392                                                    message: report.message,
1393                                                    percentage: report
1394                                                        .percentage
1395                                                        .map(|p| p as usize),
1396                                                    last_update_at: Instant::now(),
1397                                                },
1398                                            })
1399                                            .ok();
1400                                    }
1401                                    lsp::WorkDoneProgress::End(_) => {
1402                                        language_server_events_tx
1403                                            .try_send(LanguageServerEvent::WorkEnd { token })
1404                                            .ok();
1405                                    }
1406                                },
1407                            }
1408                        })
1409                        .detach();
1410
1411                    let language_server = language_server
1412                        .initialize(adapter.initialization_options())
1413                        .await
1414                        .log_err()?;
1415
1416                    // Process all the LSP events.
1417                    cx.spawn(|mut cx| {
1418                        let this = this.downgrade();
1419                        async move {
1420                            while let Ok(event) = language_server_events_rx.recv().await {
1421                                let this = this.upgrade(&cx)?;
1422                                this.update(&mut cx, |this, cx| {
1423                                    this.on_lsp_event(server_id, event, &language, cx)
1424                                });
1425
1426                                // Don't starve the main thread when lots of events arrive all at once.
1427                                smol::future::yield_now().await;
1428                            }
1429                            Some(())
1430                        }
1431                    })
1432                    .detach();
1433
1434                    this.update(&mut cx, |this, cx| {
1435                        this.language_servers
1436                            .insert(key.clone(), (adapter, language_server.clone()));
1437                        this.language_server_statuses.insert(
1438                            server_id,
1439                            LanguageServerStatus {
1440                                name: language_server.name().to_string(),
1441                                pending_work: Default::default(),
1442                                pending_diagnostic_updates: 0,
1443                            },
1444                        );
1445                        language_server
1446                            .notify::<lsp::notification::DidChangeConfiguration>(
1447                                lsp::DidChangeConfigurationParams {
1448                                    settings: this.language_server_settings.lock().clone(),
1449                                },
1450                            )
1451                            .ok();
1452
1453                        if let Some(project_id) = this.remote_id() {
1454                            this.client
1455                                .send(proto::StartLanguageServer {
1456                                    project_id,
1457                                    server: Some(proto::LanguageServer {
1458                                        id: server_id as u64,
1459                                        name: language_server.name().to_string(),
1460                                    }),
1461                                })
1462                                .log_err();
1463                        }
1464
1465                        // Tell the language server about every open buffer in the worktree that matches the language.
1466                        for buffer in this.opened_buffers.values() {
1467                            if let Some(buffer_handle) = buffer.upgrade(cx) {
1468                                let buffer = buffer_handle.read(cx);
1469                                let file = if let Some(file) = File::from_dyn(buffer.file()) {
1470                                    file
1471                                } else {
1472                                    continue;
1473                                };
1474                                let language = if let Some(language) = buffer.language() {
1475                                    language
1476                                } else {
1477                                    continue;
1478                                };
1479                                if file.worktree.read(cx).id() != key.0
1480                                    || language.lsp_adapter().map(|a| a.name())
1481                                        != Some(key.1.clone())
1482                                {
1483                                    continue;
1484                                }
1485
1486                                let file = file.as_local()?;
1487                                let versions = this
1488                                    .buffer_snapshots
1489                                    .entry(buffer.remote_id())
1490                                    .or_insert_with(|| vec![(0, buffer.text_snapshot())]);
1491                                let (version, initial_snapshot) = versions.last().unwrap();
1492                                let uri = lsp::Url::from_file_path(file.abs_path(cx)).unwrap();
1493                                language_server
1494                                    .notify::<lsp::notification::DidOpenTextDocument>(
1495                                        lsp::DidOpenTextDocumentParams {
1496                                            text_document: lsp::TextDocumentItem::new(
1497                                                uri,
1498                                                Default::default(),
1499                                                *version,
1500                                                initial_snapshot.text(),
1501                                            ),
1502                                        },
1503                                    )
1504                                    .log_err()?;
1505                                buffer_handle.update(cx, |buffer, cx| {
1506                                    buffer.set_completion_triggers(
1507                                        language_server
1508                                            .capabilities()
1509                                            .completion_provider
1510                                            .as_ref()
1511                                            .and_then(|provider| {
1512                                                provider.trigger_characters.clone()
1513                                            })
1514                                            .unwrap_or(Vec::new()),
1515                                        cx,
1516                                    )
1517                                });
1518                            }
1519                        }
1520
1521                        cx.notify();
1522                        Some(())
1523                    });
1524
1525                    Some(language_server)
1526                })
1527            });
1528    }
1529
1530    pub fn restart_language_servers_for_buffers(
1531        &mut self,
1532        buffers: impl IntoIterator<Item = ModelHandle<Buffer>>,
1533        cx: &mut ModelContext<Self>,
1534    ) -> Option<()> {
1535        let language_server_lookup_info: HashSet<(WorktreeId, Arc<Path>, PathBuf)> = buffers
1536            .into_iter()
1537            .filter_map(|buffer| {
1538                let file = File::from_dyn(buffer.read(cx).file())?;
1539                let worktree = file.worktree.read(cx).as_local()?;
1540                let worktree_id = worktree.id();
1541                let worktree_abs_path = worktree.abs_path().clone();
1542                let full_path = file.full_path(cx);
1543                Some((worktree_id, worktree_abs_path, full_path))
1544            })
1545            .collect();
1546        for (worktree_id, worktree_abs_path, full_path) in language_server_lookup_info {
1547            let language = self.languages.select_language(&full_path)?;
1548            self.restart_language_server(worktree_id, worktree_abs_path, language, cx);
1549        }
1550
1551        None
1552    }
1553
1554    fn restart_language_server(
1555        &mut self,
1556        worktree_id: WorktreeId,
1557        worktree_path: Arc<Path>,
1558        language: Arc<Language>,
1559        cx: &mut ModelContext<Self>,
1560    ) {
1561        let adapter = if let Some(adapter) = language.lsp_adapter() {
1562            adapter
1563        } else {
1564            return;
1565        };
1566        let key = (worktree_id, adapter.name());
1567        let server_to_shutdown = self.language_servers.remove(&key);
1568        self.started_language_servers.remove(&key);
1569        server_to_shutdown
1570            .as_ref()
1571            .map(|(_, server)| self.language_server_statuses.remove(&server.server_id()));
1572        cx.spawn_weak(|this, mut cx| async move {
1573            if let Some(this) = this.upgrade(&cx) {
1574                if let Some((_, server_to_shutdown)) = server_to_shutdown {
1575                    if let Some(shutdown_task) = server_to_shutdown.shutdown() {
1576                        shutdown_task.await;
1577                    }
1578                }
1579
1580                this.update(&mut cx, |this, cx| {
1581                    this.start_language_server(worktree_id, worktree_path, language, cx);
1582                });
1583            }
1584        })
1585        .detach();
1586    }
1587
1588    fn on_lsp_event(
1589        &mut self,
1590        language_server_id: usize,
1591        event: LanguageServerEvent,
1592        language: &Arc<Language>,
1593        cx: &mut ModelContext<Self>,
1594    ) {
1595        let disk_diagnostics_token = language.disk_based_diagnostics_progress_token();
1596        let language_server_status =
1597            if let Some(status) = self.language_server_statuses.get_mut(&language_server_id) {
1598                status
1599            } else {
1600                return;
1601            };
1602
1603        match event {
1604            LanguageServerEvent::WorkStart { token } => {
1605                if Some(token.as_str()) == disk_diagnostics_token {
1606                    language_server_status.pending_diagnostic_updates += 1;
1607                    if language_server_status.pending_diagnostic_updates == 1 {
1608                        self.disk_based_diagnostics_started(cx);
1609                        self.broadcast_language_server_update(
1610                            language_server_id,
1611                            proto::update_language_server::Variant::DiskBasedDiagnosticsUpdating(
1612                                proto::LspDiskBasedDiagnosticsUpdating {},
1613                            ),
1614                        );
1615                    }
1616                } else {
1617                    self.on_lsp_work_start(language_server_id, token.clone(), cx);
1618                    self.broadcast_language_server_update(
1619                        language_server_id,
1620                        proto::update_language_server::Variant::WorkStart(proto::LspWorkStart {
1621                            token,
1622                        }),
1623                    );
1624                }
1625            }
1626            LanguageServerEvent::WorkProgress { token, progress } => {
1627                if Some(token.as_str()) != disk_diagnostics_token {
1628                    self.on_lsp_work_progress(
1629                        language_server_id,
1630                        token.clone(),
1631                        progress.clone(),
1632                        cx,
1633                    );
1634                    self.broadcast_language_server_update(
1635                        language_server_id,
1636                        proto::update_language_server::Variant::WorkProgress(
1637                            proto::LspWorkProgress {
1638                                token,
1639                                message: progress.message,
1640                                percentage: progress.percentage.map(|p| p as u32),
1641                            },
1642                        ),
1643                    );
1644                }
1645            }
1646            LanguageServerEvent::WorkEnd { token } => {
1647                if Some(token.as_str()) == disk_diagnostics_token {
1648                    language_server_status.pending_diagnostic_updates -= 1;
1649                    if language_server_status.pending_diagnostic_updates == 0 {
1650                        self.disk_based_diagnostics_finished(cx);
1651                        self.broadcast_language_server_update(
1652                            language_server_id,
1653                            proto::update_language_server::Variant::DiskBasedDiagnosticsUpdated(
1654                                proto::LspDiskBasedDiagnosticsUpdated {},
1655                            ),
1656                        );
1657                    }
1658                } else {
1659                    self.on_lsp_work_end(language_server_id, token.clone(), cx);
1660                    self.broadcast_language_server_update(
1661                        language_server_id,
1662                        proto::update_language_server::Variant::WorkEnd(proto::LspWorkEnd {
1663                            token,
1664                        }),
1665                    );
1666                }
1667            }
1668            LanguageServerEvent::DiagnosticsUpdate(mut params) => {
1669                language.process_diagnostics(&mut params);
1670
1671                if disk_diagnostics_token.is_none() {
1672                    self.disk_based_diagnostics_started(cx);
1673                    self.broadcast_language_server_update(
1674                        language_server_id,
1675                        proto::update_language_server::Variant::DiskBasedDiagnosticsUpdating(
1676                            proto::LspDiskBasedDiagnosticsUpdating {},
1677                        ),
1678                    );
1679                }
1680                self.update_diagnostics(params, language.disk_based_diagnostic_sources(), cx)
1681                    .log_err();
1682                if disk_diagnostics_token.is_none() {
1683                    self.disk_based_diagnostics_finished(cx);
1684                    self.broadcast_language_server_update(
1685                        language_server_id,
1686                        proto::update_language_server::Variant::DiskBasedDiagnosticsUpdated(
1687                            proto::LspDiskBasedDiagnosticsUpdated {},
1688                        ),
1689                    );
1690                }
1691            }
1692        }
1693    }
1694
1695    fn on_lsp_work_start(
1696        &mut self,
1697        language_server_id: usize,
1698        token: String,
1699        cx: &mut ModelContext<Self>,
1700    ) {
1701        if let Some(status) = self.language_server_statuses.get_mut(&language_server_id) {
1702            status.pending_work.insert(
1703                token,
1704                LanguageServerProgress {
1705                    message: None,
1706                    percentage: None,
1707                    last_update_at: Instant::now(),
1708                },
1709            );
1710            cx.notify();
1711        }
1712    }
1713
1714    fn on_lsp_work_progress(
1715        &mut self,
1716        language_server_id: usize,
1717        token: String,
1718        progress: LanguageServerProgress,
1719        cx: &mut ModelContext<Self>,
1720    ) {
1721        if let Some(status) = self.language_server_statuses.get_mut(&language_server_id) {
1722            status.pending_work.insert(token, progress);
1723            cx.notify();
1724        }
1725    }
1726
1727    fn on_lsp_work_end(
1728        &mut self,
1729        language_server_id: usize,
1730        token: String,
1731        cx: &mut ModelContext<Self>,
1732    ) {
1733        if let Some(status) = self.language_server_statuses.get_mut(&language_server_id) {
1734            status.pending_work.remove(&token);
1735            cx.notify();
1736        }
1737    }
1738
1739    fn broadcast_language_server_update(
1740        &self,
1741        language_server_id: usize,
1742        event: proto::update_language_server::Variant,
1743    ) {
1744        if let Some(project_id) = self.remote_id() {
1745            self.client
1746                .send(proto::UpdateLanguageServer {
1747                    project_id,
1748                    language_server_id: language_server_id as u64,
1749                    variant: Some(event),
1750                })
1751                .log_err();
1752        }
1753    }
1754
1755    pub fn set_language_server_settings(&mut self, settings: serde_json::Value) {
1756        for (_, server) in self.language_servers.values() {
1757            server
1758                .notify::<lsp::notification::DidChangeConfiguration>(
1759                    lsp::DidChangeConfigurationParams {
1760                        settings: settings.clone(),
1761                    },
1762                )
1763                .ok();
1764        }
1765        *self.language_server_settings.lock() = settings;
1766    }
1767
1768    pub fn language_server_statuses(
1769        &self,
1770    ) -> impl DoubleEndedIterator<Item = &LanguageServerStatus> {
1771        self.language_server_statuses.values()
1772    }
1773
1774    pub fn update_diagnostics(
1775        &mut self,
1776        params: lsp::PublishDiagnosticsParams,
1777        disk_based_sources: &[&str],
1778        cx: &mut ModelContext<Self>,
1779    ) -> Result<()> {
1780        let abs_path = params
1781            .uri
1782            .to_file_path()
1783            .map_err(|_| anyhow!("URI is not a file"))?;
1784        let mut next_group_id = 0;
1785        let mut diagnostics = Vec::default();
1786        let mut primary_diagnostic_group_ids = HashMap::default();
1787        let mut sources_by_group_id = HashMap::default();
1788        let mut supporting_diagnostics = HashMap::default();
1789        for diagnostic in &params.diagnostics {
1790            let source = diagnostic.source.as_ref();
1791            let code = diagnostic.code.as_ref().map(|code| match code {
1792                lsp::NumberOrString::Number(code) => code.to_string(),
1793                lsp::NumberOrString::String(code) => code.clone(),
1794            });
1795            let range = range_from_lsp(diagnostic.range);
1796            let is_supporting = diagnostic
1797                .related_information
1798                .as_ref()
1799                .map_or(false, |infos| {
1800                    infos.iter().any(|info| {
1801                        primary_diagnostic_group_ids.contains_key(&(
1802                            source,
1803                            code.clone(),
1804                            range_from_lsp(info.location.range),
1805                        ))
1806                    })
1807                });
1808
1809            let is_unnecessary = diagnostic.tags.as_ref().map_or(false, |tags| {
1810                tags.iter().any(|tag| *tag == DiagnosticTag::UNNECESSARY)
1811            });
1812
1813            if is_supporting {
1814                supporting_diagnostics.insert(
1815                    (source, code.clone(), range),
1816                    (diagnostic.severity, is_unnecessary),
1817                );
1818            } else {
1819                let group_id = post_inc(&mut next_group_id);
1820                let is_disk_based = source.map_or(false, |source| {
1821                    disk_based_sources.contains(&source.as_str())
1822                });
1823
1824                sources_by_group_id.insert(group_id, source);
1825                primary_diagnostic_group_ids
1826                    .insert((source, code.clone(), range.clone()), group_id);
1827
1828                diagnostics.push(DiagnosticEntry {
1829                    range,
1830                    diagnostic: Diagnostic {
1831                        code: code.clone(),
1832                        severity: diagnostic.severity.unwrap_or(DiagnosticSeverity::ERROR),
1833                        message: diagnostic.message.clone(),
1834                        group_id,
1835                        is_primary: true,
1836                        is_valid: true,
1837                        is_disk_based,
1838                        is_unnecessary,
1839                    },
1840                });
1841                if let Some(infos) = &diagnostic.related_information {
1842                    for info in infos {
1843                        if info.location.uri == params.uri && !info.message.is_empty() {
1844                            let range = range_from_lsp(info.location.range);
1845                            diagnostics.push(DiagnosticEntry {
1846                                range,
1847                                diagnostic: Diagnostic {
1848                                    code: code.clone(),
1849                                    severity: DiagnosticSeverity::INFORMATION,
1850                                    message: info.message.clone(),
1851                                    group_id,
1852                                    is_primary: false,
1853                                    is_valid: true,
1854                                    is_disk_based,
1855                                    is_unnecessary: false,
1856                                },
1857                            });
1858                        }
1859                    }
1860                }
1861            }
1862        }
1863
1864        for entry in &mut diagnostics {
1865            let diagnostic = &mut entry.diagnostic;
1866            if !diagnostic.is_primary {
1867                let source = *sources_by_group_id.get(&diagnostic.group_id).unwrap();
1868                if let Some(&(severity, is_unnecessary)) = supporting_diagnostics.get(&(
1869                    source,
1870                    diagnostic.code.clone(),
1871                    entry.range.clone(),
1872                )) {
1873                    if let Some(severity) = severity {
1874                        diagnostic.severity = severity;
1875                    }
1876                    diagnostic.is_unnecessary = is_unnecessary;
1877                }
1878            }
1879        }
1880
1881        self.update_diagnostic_entries(abs_path, params.version, diagnostics, cx)?;
1882        Ok(())
1883    }
1884
1885    pub fn update_diagnostic_entries(
1886        &mut self,
1887        abs_path: PathBuf,
1888        version: Option<i32>,
1889        diagnostics: Vec<DiagnosticEntry<PointUtf16>>,
1890        cx: &mut ModelContext<Project>,
1891    ) -> Result<(), anyhow::Error> {
1892        let (worktree, relative_path) = self
1893            .find_local_worktree(&abs_path, cx)
1894            .ok_or_else(|| anyhow!("no worktree found for diagnostics"))?;
1895        if !worktree.read(cx).is_visible() {
1896            return Ok(());
1897        }
1898
1899        let project_path = ProjectPath {
1900            worktree_id: worktree.read(cx).id(),
1901            path: relative_path.into(),
1902        };
1903
1904        for buffer in self.opened_buffers.values() {
1905            if let Some(buffer) = buffer.upgrade(cx) {
1906                if buffer
1907                    .read(cx)
1908                    .file()
1909                    .map_or(false, |file| *file.path() == project_path.path)
1910                {
1911                    self.update_buffer_diagnostics(&buffer, diagnostics.clone(), version, cx)?;
1912                    break;
1913                }
1914            }
1915        }
1916        worktree.update(cx, |worktree, cx| {
1917            worktree
1918                .as_local_mut()
1919                .ok_or_else(|| anyhow!("not a local worktree"))?
1920                .update_diagnostics(project_path.path.clone(), diagnostics, cx)
1921        })?;
1922        cx.emit(Event::DiagnosticsUpdated(project_path));
1923        Ok(())
1924    }
1925
1926    fn update_buffer_diagnostics(
1927        &mut self,
1928        buffer: &ModelHandle<Buffer>,
1929        mut diagnostics: Vec<DiagnosticEntry<PointUtf16>>,
1930        version: Option<i32>,
1931        cx: &mut ModelContext<Self>,
1932    ) -> Result<()> {
1933        fn compare_diagnostics(a: &Diagnostic, b: &Diagnostic) -> Ordering {
1934            Ordering::Equal
1935                .then_with(|| b.is_primary.cmp(&a.is_primary))
1936                .then_with(|| a.is_disk_based.cmp(&b.is_disk_based))
1937                .then_with(|| a.severity.cmp(&b.severity))
1938                .then_with(|| a.message.cmp(&b.message))
1939        }
1940
1941        let snapshot = self.buffer_snapshot_for_lsp_version(buffer, version, cx)?;
1942
1943        diagnostics.sort_unstable_by(|a, b| {
1944            Ordering::Equal
1945                .then_with(|| a.range.start.cmp(&b.range.start))
1946                .then_with(|| b.range.end.cmp(&a.range.end))
1947                .then_with(|| compare_diagnostics(&a.diagnostic, &b.diagnostic))
1948        });
1949
1950        let mut sanitized_diagnostics = Vec::new();
1951        let edits_since_save = Patch::new(
1952            snapshot
1953                .edits_since::<PointUtf16>(buffer.read(cx).saved_version())
1954                .collect(),
1955        );
1956        for entry in diagnostics {
1957            let start;
1958            let end;
1959            if entry.diagnostic.is_disk_based {
1960                // Some diagnostics are based on files on disk instead of buffers'
1961                // current contents. Adjust these diagnostics' ranges to reflect
1962                // any unsaved edits.
1963                start = edits_since_save.old_to_new(entry.range.start);
1964                end = edits_since_save.old_to_new(entry.range.end);
1965            } else {
1966                start = entry.range.start;
1967                end = entry.range.end;
1968            }
1969
1970            let mut range = snapshot.clip_point_utf16(start, Bias::Left)
1971                ..snapshot.clip_point_utf16(end, Bias::Right);
1972
1973            // Expand empty ranges by one character
1974            if range.start == range.end {
1975                range.end.column += 1;
1976                range.end = snapshot.clip_point_utf16(range.end, Bias::Right);
1977                if range.start == range.end && range.end.column > 0 {
1978                    range.start.column -= 1;
1979                    range.start = snapshot.clip_point_utf16(range.start, Bias::Left);
1980                }
1981            }
1982
1983            sanitized_diagnostics.push(DiagnosticEntry {
1984                range,
1985                diagnostic: entry.diagnostic,
1986            });
1987        }
1988        drop(edits_since_save);
1989
1990        let set = DiagnosticSet::new(sanitized_diagnostics, &snapshot);
1991        buffer.update(cx, |buffer, cx| buffer.update_diagnostics(set, cx));
1992        Ok(())
1993    }
1994
1995    pub fn format(
1996        &self,
1997        buffers: HashSet<ModelHandle<Buffer>>,
1998        push_to_history: bool,
1999        cx: &mut ModelContext<Project>,
2000    ) -> Task<Result<ProjectTransaction>> {
2001        let mut local_buffers = Vec::new();
2002        let mut remote_buffers = None;
2003        for buffer_handle in buffers {
2004            let buffer = buffer_handle.read(cx);
2005            if let Some(file) = File::from_dyn(buffer.file()) {
2006                if let Some(buffer_abs_path) = file.as_local().map(|f| f.abs_path(cx)) {
2007                    if let Some((_, server)) = self.language_server_for_buffer(buffer, cx) {
2008                        local_buffers.push((buffer_handle, buffer_abs_path, server.clone()));
2009                    }
2010                } else {
2011                    remote_buffers.get_or_insert(Vec::new()).push(buffer_handle);
2012                }
2013            } else {
2014                return Task::ready(Ok(Default::default()));
2015            }
2016        }
2017
2018        let remote_buffers = self.remote_id().zip(remote_buffers);
2019        let client = self.client.clone();
2020
2021        cx.spawn(|this, mut cx| async move {
2022            let mut project_transaction = ProjectTransaction::default();
2023
2024            if let Some((project_id, remote_buffers)) = remote_buffers {
2025                let response = client
2026                    .request(proto::FormatBuffers {
2027                        project_id,
2028                        buffer_ids: remote_buffers
2029                            .iter()
2030                            .map(|buffer| buffer.read_with(&cx, |buffer, _| buffer.remote_id()))
2031                            .collect(),
2032                    })
2033                    .await?
2034                    .transaction
2035                    .ok_or_else(|| anyhow!("missing transaction"))?;
2036                project_transaction = this
2037                    .update(&mut cx, |this, cx| {
2038                        this.deserialize_project_transaction(response, push_to_history, cx)
2039                    })
2040                    .await?;
2041            }
2042
2043            for (buffer, buffer_abs_path, language_server) in local_buffers {
2044                let text_document = lsp::TextDocumentIdentifier::new(
2045                    lsp::Url::from_file_path(&buffer_abs_path).unwrap(),
2046                );
2047                let capabilities = &language_server.capabilities();
2048                let lsp_edits = if capabilities
2049                    .document_formatting_provider
2050                    .as_ref()
2051                    .map_or(false, |provider| *provider != lsp::OneOf::Left(false))
2052                {
2053                    language_server
2054                        .request::<lsp::request::Formatting>(lsp::DocumentFormattingParams {
2055                            text_document,
2056                            options: lsp::FormattingOptions {
2057                                tab_size: 4,
2058                                insert_spaces: true,
2059                                insert_final_newline: Some(true),
2060                                ..Default::default()
2061                            },
2062                            work_done_progress_params: Default::default(),
2063                        })
2064                        .await?
2065                } else if capabilities
2066                    .document_range_formatting_provider
2067                    .as_ref()
2068                    .map_or(false, |provider| *provider != lsp::OneOf::Left(false))
2069                {
2070                    let buffer_start = lsp::Position::new(0, 0);
2071                    let buffer_end =
2072                        buffer.read_with(&cx, |buffer, _| point_to_lsp(buffer.max_point_utf16()));
2073                    language_server
2074                        .request::<lsp::request::RangeFormatting>(
2075                            lsp::DocumentRangeFormattingParams {
2076                                text_document,
2077                                range: lsp::Range::new(buffer_start, buffer_end),
2078                                options: lsp::FormattingOptions {
2079                                    tab_size: 4,
2080                                    insert_spaces: true,
2081                                    insert_final_newline: Some(true),
2082                                    ..Default::default()
2083                                },
2084                                work_done_progress_params: Default::default(),
2085                            },
2086                        )
2087                        .await?
2088                } else {
2089                    continue;
2090                };
2091
2092                if let Some(lsp_edits) = lsp_edits {
2093                    let edits = this
2094                        .update(&mut cx, |this, cx| {
2095                            this.edits_from_lsp(&buffer, lsp_edits, None, cx)
2096                        })
2097                        .await?;
2098                    buffer.update(&mut cx, |buffer, cx| {
2099                        buffer.finalize_last_transaction();
2100                        buffer.start_transaction();
2101                        for (range, text) in edits {
2102                            buffer.edit([range], text, cx);
2103                        }
2104                        if buffer.end_transaction(cx).is_some() {
2105                            let transaction = buffer.finalize_last_transaction().unwrap().clone();
2106                            if !push_to_history {
2107                                buffer.forget_transaction(transaction.id);
2108                            }
2109                            project_transaction.0.insert(cx.handle(), transaction);
2110                        }
2111                    });
2112                }
2113            }
2114
2115            Ok(project_transaction)
2116        })
2117    }
2118
2119    pub fn definition<T: ToPointUtf16>(
2120        &self,
2121        buffer: &ModelHandle<Buffer>,
2122        position: T,
2123        cx: &mut ModelContext<Self>,
2124    ) -> Task<Result<Vec<Location>>> {
2125        let position = position.to_point_utf16(buffer.read(cx));
2126        self.request_lsp(buffer.clone(), GetDefinition { position }, cx)
2127    }
2128
2129    pub fn references<T: ToPointUtf16>(
2130        &self,
2131        buffer: &ModelHandle<Buffer>,
2132        position: T,
2133        cx: &mut ModelContext<Self>,
2134    ) -> Task<Result<Vec<Location>>> {
2135        let position = position.to_point_utf16(buffer.read(cx));
2136        self.request_lsp(buffer.clone(), GetReferences { position }, cx)
2137    }
2138
2139    pub fn document_highlights<T: ToPointUtf16>(
2140        &self,
2141        buffer: &ModelHandle<Buffer>,
2142        position: T,
2143        cx: &mut ModelContext<Self>,
2144    ) -> Task<Result<Vec<DocumentHighlight>>> {
2145        let position = position.to_point_utf16(buffer.read(cx));
2146
2147        self.request_lsp(buffer.clone(), GetDocumentHighlights { position }, cx)
2148    }
2149
2150    pub fn symbols(&self, query: &str, cx: &mut ModelContext<Self>) -> Task<Result<Vec<Symbol>>> {
2151        if self.is_local() {
2152            let mut language_servers = HashMap::default();
2153            for ((worktree_id, _), (lsp_adapter, language_server)) in self.language_servers.iter() {
2154                if let Some(worktree) = self
2155                    .worktree_for_id(*worktree_id, cx)
2156                    .and_then(|worktree| worktree.read(cx).as_local())
2157                {
2158                    language_servers
2159                        .entry(Arc::as_ptr(language_server))
2160                        .or_insert((
2161                            lsp_adapter.clone(),
2162                            language_server.clone(),
2163                            *worktree_id,
2164                            worktree.abs_path().clone(),
2165                        ));
2166                }
2167            }
2168
2169            let mut requests = Vec::new();
2170            for (_, language_server, _, _) in language_servers.values() {
2171                requests.push(language_server.request::<lsp::request::WorkspaceSymbol>(
2172                    lsp::WorkspaceSymbolParams {
2173                        query: query.to_string(),
2174                        ..Default::default()
2175                    },
2176                ));
2177            }
2178
2179            cx.spawn_weak(|this, cx| async move {
2180                let responses = futures::future::try_join_all(requests).await?;
2181
2182                let mut symbols = Vec::new();
2183                if let Some(this) = this.upgrade(&cx) {
2184                    this.read_with(&cx, |this, cx| {
2185                        for ((adapter, _, source_worktree_id, worktree_abs_path), lsp_symbols) in
2186                            language_servers.into_values().zip(responses)
2187                        {
2188                            symbols.extend(lsp_symbols.into_iter().flatten().filter_map(
2189                                |lsp_symbol| {
2190                                    let abs_path = lsp_symbol.location.uri.to_file_path().ok()?;
2191                                    let mut worktree_id = source_worktree_id;
2192                                    let path;
2193                                    if let Some((worktree, rel_path)) =
2194                                        this.find_local_worktree(&abs_path, cx)
2195                                    {
2196                                        worktree_id = worktree.read(cx).id();
2197                                        path = rel_path;
2198                                    } else {
2199                                        path = relativize_path(&worktree_abs_path, &abs_path);
2200                                    }
2201
2202                                    let label = this
2203                                        .languages
2204                                        .select_language(&path)
2205                                        .and_then(|language| {
2206                                            language
2207                                                .label_for_symbol(&lsp_symbol.name, lsp_symbol.kind)
2208                                        })
2209                                        .unwrap_or_else(|| {
2210                                            CodeLabel::plain(lsp_symbol.name.clone(), None)
2211                                        });
2212                                    let signature = this.symbol_signature(worktree_id, &path);
2213
2214                                    Some(Symbol {
2215                                        source_worktree_id,
2216                                        worktree_id,
2217                                        language_server_name: adapter.name(),
2218                                        name: lsp_symbol.name,
2219                                        kind: lsp_symbol.kind,
2220                                        label,
2221                                        path,
2222                                        range: range_from_lsp(lsp_symbol.location.range),
2223                                        signature,
2224                                    })
2225                                },
2226                            ));
2227                        }
2228                    })
2229                }
2230
2231                Ok(symbols)
2232            })
2233        } else if let Some(project_id) = self.remote_id() {
2234            let request = self.client.request(proto::GetProjectSymbols {
2235                project_id,
2236                query: query.to_string(),
2237            });
2238            cx.spawn_weak(|this, cx| async move {
2239                let response = request.await?;
2240                let mut symbols = Vec::new();
2241                if let Some(this) = this.upgrade(&cx) {
2242                    this.read_with(&cx, |this, _| {
2243                        symbols.extend(
2244                            response
2245                                .symbols
2246                                .into_iter()
2247                                .filter_map(|symbol| this.deserialize_symbol(symbol).log_err()),
2248                        );
2249                    })
2250                }
2251                Ok(symbols)
2252            })
2253        } else {
2254            Task::ready(Ok(Default::default()))
2255        }
2256    }
2257
2258    pub fn open_buffer_for_symbol(
2259        &mut self,
2260        symbol: &Symbol,
2261        cx: &mut ModelContext<Self>,
2262    ) -> Task<Result<ModelHandle<Buffer>>> {
2263        if self.is_local() {
2264            let (lsp_adapter, language_server) = if let Some(server) = self.language_servers.get(&(
2265                symbol.source_worktree_id,
2266                symbol.language_server_name.clone(),
2267            )) {
2268                server.clone()
2269            } else {
2270                return Task::ready(Err(anyhow!(
2271                    "language server for worktree and language not found"
2272                )));
2273            };
2274
2275            let worktree_abs_path = if let Some(worktree_abs_path) = self
2276                .worktree_for_id(symbol.worktree_id, cx)
2277                .and_then(|worktree| worktree.read(cx).as_local())
2278                .map(|local_worktree| local_worktree.abs_path())
2279            {
2280                worktree_abs_path
2281            } else {
2282                return Task::ready(Err(anyhow!("worktree not found for symbol")));
2283            };
2284            let symbol_abs_path = worktree_abs_path.join(&symbol.path);
2285            let symbol_uri = if let Ok(uri) = lsp::Url::from_file_path(symbol_abs_path) {
2286                uri
2287            } else {
2288                return Task::ready(Err(anyhow!("invalid symbol path")));
2289            };
2290
2291            self.open_local_buffer_via_lsp(symbol_uri, lsp_adapter, language_server, cx)
2292        } else if let Some(project_id) = self.remote_id() {
2293            let request = self.client.request(proto::OpenBufferForSymbol {
2294                project_id,
2295                symbol: Some(serialize_symbol(symbol)),
2296            });
2297            cx.spawn(|this, mut cx| async move {
2298                let response = request.await?;
2299                let buffer = response.buffer.ok_or_else(|| anyhow!("invalid buffer"))?;
2300                this.update(&mut cx, |this, cx| this.deserialize_buffer(buffer, cx))
2301                    .await
2302            })
2303        } else {
2304            Task::ready(Err(anyhow!("project does not have a remote id")))
2305        }
2306    }
2307
2308    pub fn completions<T: ToPointUtf16>(
2309        &self,
2310        source_buffer_handle: &ModelHandle<Buffer>,
2311        position: T,
2312        cx: &mut ModelContext<Self>,
2313    ) -> Task<Result<Vec<Completion>>> {
2314        let source_buffer_handle = source_buffer_handle.clone();
2315        let source_buffer = source_buffer_handle.read(cx);
2316        let buffer_id = source_buffer.remote_id();
2317        let language = source_buffer.language().cloned();
2318        let worktree;
2319        let buffer_abs_path;
2320        if let Some(file) = File::from_dyn(source_buffer.file()) {
2321            worktree = file.worktree.clone();
2322            buffer_abs_path = file.as_local().map(|f| f.abs_path(cx));
2323        } else {
2324            return Task::ready(Ok(Default::default()));
2325        };
2326
2327        let position = position.to_point_utf16(source_buffer);
2328        let anchor = source_buffer.anchor_after(position);
2329
2330        if worktree.read(cx).as_local().is_some() {
2331            let buffer_abs_path = buffer_abs_path.unwrap();
2332            let (_, lang_server) =
2333                if let Some(server) = self.language_server_for_buffer(source_buffer, cx) {
2334                    server.clone()
2335                } else {
2336                    return Task::ready(Ok(Default::default()));
2337                };
2338
2339            cx.spawn(|_, cx| async move {
2340                let clipped_position = source_buffer_handle
2341                    .read_with(&cx, |this, _| this.clip_point_utf16(position, Bias::Left));
2342                if clipped_position != position {
2343                    log::info!("Completion position out of date");
2344                    return Ok(Default::default());
2345                }
2346
2347                let completions = lang_server
2348                    .request::<lsp::request::Completion>(lsp::CompletionParams {
2349                        text_document_position: lsp::TextDocumentPositionParams::new(
2350                            lsp::TextDocumentIdentifier::new(
2351                                lsp::Url::from_file_path(buffer_abs_path).unwrap(),
2352                            ),
2353                            point_to_lsp(position),
2354                        ),
2355                        context: Default::default(),
2356                        work_done_progress_params: Default::default(),
2357                        partial_result_params: Default::default(),
2358                    })
2359                    .await
2360                    .context("lsp completion request failed")?;
2361
2362                let completions = if let Some(completions) = completions {
2363                    match completions {
2364                        lsp::CompletionResponse::Array(completions) => completions,
2365                        lsp::CompletionResponse::List(list) => list.items,
2366                    }
2367                } else {
2368                    Default::default()
2369                };
2370
2371                source_buffer_handle.read_with(&cx, |this, _| {
2372                    Ok(completions
2373                        .into_iter()
2374                        .filter_map(|lsp_completion| {
2375                            let (old_range, new_text) = match lsp_completion.text_edit.as_ref() {
2376                                Some(lsp::CompletionTextEdit::Edit(edit)) => {
2377                                    (range_from_lsp(edit.range), edit.new_text.clone())
2378                                }
2379                                None => (
2380                                    this.common_prefix_at(position, &lsp_completion.label),
2381                                    lsp_completion.label.clone(),
2382                                ),
2383                                Some(lsp::CompletionTextEdit::InsertAndReplace(_)) => {
2384                                    log::info!("unsupported insert/replace completion");
2385                                    return None;
2386                                }
2387                            };
2388
2389                            let clipped_start = this.clip_point_utf16(old_range.start, Bias::Left);
2390                            let clipped_end = this.clip_point_utf16(old_range.end, Bias::Left);
2391                            if clipped_start == old_range.start && clipped_end == old_range.end {
2392                                Some(Completion {
2393                                    old_range: this.anchor_before(old_range.start)
2394                                        ..this.anchor_after(old_range.end),
2395                                    new_text,
2396                                    label: language
2397                                        .as_ref()
2398                                        .and_then(|l| l.label_for_completion(&lsp_completion))
2399                                        .unwrap_or_else(|| {
2400                                            CodeLabel::plain(
2401                                                lsp_completion.label.clone(),
2402                                                lsp_completion.filter_text.as_deref(),
2403                                            )
2404                                        }),
2405                                    lsp_completion,
2406                                })
2407                            } else {
2408                                log::info!("completion out of expected range");
2409                                None
2410                            }
2411                        })
2412                        .collect())
2413                })
2414            })
2415        } else if let Some(project_id) = self.remote_id() {
2416            let rpc = self.client.clone();
2417            let message = proto::GetCompletions {
2418                project_id,
2419                buffer_id,
2420                position: Some(language::proto::serialize_anchor(&anchor)),
2421                version: serialize_version(&source_buffer.version()),
2422            };
2423            cx.spawn_weak(|_, mut cx| async move {
2424                let response = rpc.request(message).await?;
2425
2426                source_buffer_handle
2427                    .update(&mut cx, |buffer, _| {
2428                        buffer.wait_for_version(deserialize_version(response.version))
2429                    })
2430                    .await;
2431
2432                response
2433                    .completions
2434                    .into_iter()
2435                    .map(|completion| {
2436                        language::proto::deserialize_completion(completion, language.as_ref())
2437                    })
2438                    .collect()
2439            })
2440        } else {
2441            Task::ready(Ok(Default::default()))
2442        }
2443    }
2444
2445    pub fn apply_additional_edits_for_completion(
2446        &self,
2447        buffer_handle: ModelHandle<Buffer>,
2448        completion: Completion,
2449        push_to_history: bool,
2450        cx: &mut ModelContext<Self>,
2451    ) -> Task<Result<Option<Transaction>>> {
2452        let buffer = buffer_handle.read(cx);
2453        let buffer_id = buffer.remote_id();
2454
2455        if self.is_local() {
2456            let (_, lang_server) = if let Some(server) = self.language_server_for_buffer(buffer, cx)
2457            {
2458                server.clone()
2459            } else {
2460                return Task::ready(Ok(Default::default()));
2461            };
2462
2463            cx.spawn(|this, mut cx| async move {
2464                let resolved_completion = lang_server
2465                    .request::<lsp::request::ResolveCompletionItem>(completion.lsp_completion)
2466                    .await?;
2467                if let Some(edits) = resolved_completion.additional_text_edits {
2468                    let edits = this
2469                        .update(&mut cx, |this, cx| {
2470                            this.edits_from_lsp(&buffer_handle, edits, None, cx)
2471                        })
2472                        .await?;
2473                    buffer_handle.update(&mut cx, |buffer, cx| {
2474                        buffer.finalize_last_transaction();
2475                        buffer.start_transaction();
2476                        for (range, text) in edits {
2477                            buffer.edit([range], text, cx);
2478                        }
2479                        let transaction = if buffer.end_transaction(cx).is_some() {
2480                            let transaction = buffer.finalize_last_transaction().unwrap().clone();
2481                            if !push_to_history {
2482                                buffer.forget_transaction(transaction.id);
2483                            }
2484                            Some(transaction)
2485                        } else {
2486                            None
2487                        };
2488                        Ok(transaction)
2489                    })
2490                } else {
2491                    Ok(None)
2492                }
2493            })
2494        } else if let Some(project_id) = self.remote_id() {
2495            let client = self.client.clone();
2496            cx.spawn(|_, mut cx| async move {
2497                let response = client
2498                    .request(proto::ApplyCompletionAdditionalEdits {
2499                        project_id,
2500                        buffer_id,
2501                        completion: Some(language::proto::serialize_completion(&completion)),
2502                    })
2503                    .await?;
2504
2505                if let Some(transaction) = response.transaction {
2506                    let transaction = language::proto::deserialize_transaction(transaction)?;
2507                    buffer_handle
2508                        .update(&mut cx, |buffer, _| {
2509                            buffer.wait_for_edits(transaction.edit_ids.iter().copied())
2510                        })
2511                        .await;
2512                    if push_to_history {
2513                        buffer_handle.update(&mut cx, |buffer, _| {
2514                            buffer.push_transaction(transaction.clone(), Instant::now());
2515                        });
2516                    }
2517                    Ok(Some(transaction))
2518                } else {
2519                    Ok(None)
2520                }
2521            })
2522        } else {
2523            Task::ready(Err(anyhow!("project does not have a remote id")))
2524        }
2525    }
2526
2527    pub fn code_actions<T: Clone + ToOffset>(
2528        &self,
2529        buffer_handle: &ModelHandle<Buffer>,
2530        range: Range<T>,
2531        cx: &mut ModelContext<Self>,
2532    ) -> Task<Result<Vec<CodeAction>>> {
2533        let buffer_handle = buffer_handle.clone();
2534        let buffer = buffer_handle.read(cx);
2535        let snapshot = buffer.snapshot();
2536        let relevant_diagnostics = snapshot
2537            .diagnostics_in_range::<usize, usize>(range.to_offset(&snapshot), false)
2538            .map(|entry| entry.to_lsp_diagnostic_stub())
2539            .collect();
2540        let buffer_id = buffer.remote_id();
2541        let worktree;
2542        let buffer_abs_path;
2543        if let Some(file) = File::from_dyn(buffer.file()) {
2544            worktree = file.worktree.clone();
2545            buffer_abs_path = file.as_local().map(|f| f.abs_path(cx));
2546        } else {
2547            return Task::ready(Ok(Default::default()));
2548        };
2549        let range = buffer.anchor_before(range.start)..buffer.anchor_before(range.end);
2550
2551        if worktree.read(cx).as_local().is_some() {
2552            let buffer_abs_path = buffer_abs_path.unwrap();
2553            let (_, lang_server) = if let Some(server) = self.language_server_for_buffer(buffer, cx)
2554            {
2555                server.clone()
2556            } else {
2557                return Task::ready(Ok(Default::default()));
2558            };
2559
2560            let lsp_range = range_to_lsp(range.to_point_utf16(buffer));
2561            cx.foreground().spawn(async move {
2562                if !lang_server.capabilities().code_action_provider.is_some() {
2563                    return Ok(Default::default());
2564                }
2565
2566                Ok(lang_server
2567                    .request::<lsp::request::CodeActionRequest>(lsp::CodeActionParams {
2568                        text_document: lsp::TextDocumentIdentifier::new(
2569                            lsp::Url::from_file_path(buffer_abs_path).unwrap(),
2570                        ),
2571                        range: lsp_range,
2572                        work_done_progress_params: Default::default(),
2573                        partial_result_params: Default::default(),
2574                        context: lsp::CodeActionContext {
2575                            diagnostics: relevant_diagnostics,
2576                            only: Some(vec![
2577                                lsp::CodeActionKind::QUICKFIX,
2578                                lsp::CodeActionKind::REFACTOR,
2579                                lsp::CodeActionKind::REFACTOR_EXTRACT,
2580                                lsp::CodeActionKind::SOURCE,
2581                            ]),
2582                        },
2583                    })
2584                    .await?
2585                    .unwrap_or_default()
2586                    .into_iter()
2587                    .filter_map(|entry| {
2588                        if let lsp::CodeActionOrCommand::CodeAction(lsp_action) = entry {
2589                            Some(CodeAction {
2590                                range: range.clone(),
2591                                lsp_action,
2592                            })
2593                        } else {
2594                            None
2595                        }
2596                    })
2597                    .collect())
2598            })
2599        } else if let Some(project_id) = self.remote_id() {
2600            let rpc = self.client.clone();
2601            let version = buffer.version();
2602            cx.spawn_weak(|_, mut cx| async move {
2603                let response = rpc
2604                    .request(proto::GetCodeActions {
2605                        project_id,
2606                        buffer_id,
2607                        start: Some(language::proto::serialize_anchor(&range.start)),
2608                        end: Some(language::proto::serialize_anchor(&range.end)),
2609                        version: serialize_version(&version),
2610                    })
2611                    .await?;
2612
2613                buffer_handle
2614                    .update(&mut cx, |buffer, _| {
2615                        buffer.wait_for_version(deserialize_version(response.version))
2616                    })
2617                    .await;
2618
2619                response
2620                    .actions
2621                    .into_iter()
2622                    .map(language::proto::deserialize_code_action)
2623                    .collect()
2624            })
2625        } else {
2626            Task::ready(Ok(Default::default()))
2627        }
2628    }
2629
2630    pub fn apply_code_action(
2631        &self,
2632        buffer_handle: ModelHandle<Buffer>,
2633        mut action: CodeAction,
2634        push_to_history: bool,
2635        cx: &mut ModelContext<Self>,
2636    ) -> Task<Result<ProjectTransaction>> {
2637        if self.is_local() {
2638            let buffer = buffer_handle.read(cx);
2639            let (lsp_adapter, lang_server) =
2640                if let Some(server) = self.language_server_for_buffer(buffer, cx) {
2641                    server.clone()
2642                } else {
2643                    return Task::ready(Ok(Default::default()));
2644                };
2645            let range = action.range.to_point_utf16(buffer);
2646
2647            cx.spawn(|this, mut cx| async move {
2648                if let Some(lsp_range) = action
2649                    .lsp_action
2650                    .data
2651                    .as_mut()
2652                    .and_then(|d| d.get_mut("codeActionParams"))
2653                    .and_then(|d| d.get_mut("range"))
2654                {
2655                    *lsp_range = serde_json::to_value(&range_to_lsp(range)).unwrap();
2656                    action.lsp_action = lang_server
2657                        .request::<lsp::request::CodeActionResolveRequest>(action.lsp_action)
2658                        .await?;
2659                } else {
2660                    let actions = this
2661                        .update(&mut cx, |this, cx| {
2662                            this.code_actions(&buffer_handle, action.range, cx)
2663                        })
2664                        .await?;
2665                    action.lsp_action = actions
2666                        .into_iter()
2667                        .find(|a| a.lsp_action.title == action.lsp_action.title)
2668                        .ok_or_else(|| anyhow!("code action is outdated"))?
2669                        .lsp_action;
2670                }
2671
2672                if let Some(edit) = action.lsp_action.edit {
2673                    Self::deserialize_workspace_edit(
2674                        this,
2675                        edit,
2676                        push_to_history,
2677                        lsp_adapter,
2678                        lang_server,
2679                        &mut cx,
2680                    )
2681                    .await
2682                } else {
2683                    Ok(ProjectTransaction::default())
2684                }
2685            })
2686        } else if let Some(project_id) = self.remote_id() {
2687            let client = self.client.clone();
2688            let request = proto::ApplyCodeAction {
2689                project_id,
2690                buffer_id: buffer_handle.read(cx).remote_id(),
2691                action: Some(language::proto::serialize_code_action(&action)),
2692            };
2693            cx.spawn(|this, mut cx| async move {
2694                let response = client
2695                    .request(request)
2696                    .await?
2697                    .transaction
2698                    .ok_or_else(|| anyhow!("missing transaction"))?;
2699                this.update(&mut cx, |this, cx| {
2700                    this.deserialize_project_transaction(response, push_to_history, cx)
2701                })
2702                .await
2703            })
2704        } else {
2705            Task::ready(Err(anyhow!("project does not have a remote id")))
2706        }
2707    }
2708
2709    async fn deserialize_workspace_edit(
2710        this: ModelHandle<Self>,
2711        edit: lsp::WorkspaceEdit,
2712        push_to_history: bool,
2713        lsp_adapter: Arc<dyn LspAdapter>,
2714        language_server: Arc<LanguageServer>,
2715        cx: &mut AsyncAppContext,
2716    ) -> Result<ProjectTransaction> {
2717        let fs = this.read_with(cx, |this, _| this.fs.clone());
2718        let mut operations = Vec::new();
2719        if let Some(document_changes) = edit.document_changes {
2720            match document_changes {
2721                lsp::DocumentChanges::Edits(edits) => {
2722                    operations.extend(edits.into_iter().map(lsp::DocumentChangeOperation::Edit))
2723                }
2724                lsp::DocumentChanges::Operations(ops) => operations = ops,
2725            }
2726        } else if let Some(changes) = edit.changes {
2727            operations.extend(changes.into_iter().map(|(uri, edits)| {
2728                lsp::DocumentChangeOperation::Edit(lsp::TextDocumentEdit {
2729                    text_document: lsp::OptionalVersionedTextDocumentIdentifier {
2730                        uri,
2731                        version: None,
2732                    },
2733                    edits: edits.into_iter().map(lsp::OneOf::Left).collect(),
2734                })
2735            }));
2736        }
2737
2738        let mut project_transaction = ProjectTransaction::default();
2739        for operation in operations {
2740            match operation {
2741                lsp::DocumentChangeOperation::Op(lsp::ResourceOp::Create(op)) => {
2742                    let abs_path = op
2743                        .uri
2744                        .to_file_path()
2745                        .map_err(|_| anyhow!("can't convert URI to path"))?;
2746
2747                    if let Some(parent_path) = abs_path.parent() {
2748                        fs.create_dir(parent_path).await?;
2749                    }
2750                    if abs_path.ends_with("/") {
2751                        fs.create_dir(&abs_path).await?;
2752                    } else {
2753                        fs.create_file(&abs_path, op.options.map(Into::into).unwrap_or_default())
2754                            .await?;
2755                    }
2756                }
2757                lsp::DocumentChangeOperation::Op(lsp::ResourceOp::Rename(op)) => {
2758                    let source_abs_path = op
2759                        .old_uri
2760                        .to_file_path()
2761                        .map_err(|_| anyhow!("can't convert URI to path"))?;
2762                    let target_abs_path = op
2763                        .new_uri
2764                        .to_file_path()
2765                        .map_err(|_| anyhow!("can't convert URI to path"))?;
2766                    fs.rename(
2767                        &source_abs_path,
2768                        &target_abs_path,
2769                        op.options.map(Into::into).unwrap_or_default(),
2770                    )
2771                    .await?;
2772                }
2773                lsp::DocumentChangeOperation::Op(lsp::ResourceOp::Delete(op)) => {
2774                    let abs_path = op
2775                        .uri
2776                        .to_file_path()
2777                        .map_err(|_| anyhow!("can't convert URI to path"))?;
2778                    let options = op.options.map(Into::into).unwrap_or_default();
2779                    if abs_path.ends_with("/") {
2780                        fs.remove_dir(&abs_path, options).await?;
2781                    } else {
2782                        fs.remove_file(&abs_path, options).await?;
2783                    }
2784                }
2785                lsp::DocumentChangeOperation::Edit(op) => {
2786                    let buffer_to_edit = this
2787                        .update(cx, |this, cx| {
2788                            this.open_local_buffer_via_lsp(
2789                                op.text_document.uri,
2790                                lsp_adapter.clone(),
2791                                language_server.clone(),
2792                                cx,
2793                            )
2794                        })
2795                        .await?;
2796
2797                    let edits = this
2798                        .update(cx, |this, cx| {
2799                            let edits = op.edits.into_iter().map(|edit| match edit {
2800                                lsp::OneOf::Left(edit) => edit,
2801                                lsp::OneOf::Right(edit) => edit.text_edit,
2802                            });
2803                            this.edits_from_lsp(
2804                                &buffer_to_edit,
2805                                edits,
2806                                op.text_document.version,
2807                                cx,
2808                            )
2809                        })
2810                        .await?;
2811
2812                    let transaction = buffer_to_edit.update(cx, |buffer, cx| {
2813                        buffer.finalize_last_transaction();
2814                        buffer.start_transaction();
2815                        for (range, text) in edits {
2816                            buffer.edit([range], text, cx);
2817                        }
2818                        let transaction = if buffer.end_transaction(cx).is_some() {
2819                            let transaction = buffer.finalize_last_transaction().unwrap().clone();
2820                            if !push_to_history {
2821                                buffer.forget_transaction(transaction.id);
2822                            }
2823                            Some(transaction)
2824                        } else {
2825                            None
2826                        };
2827
2828                        transaction
2829                    });
2830                    if let Some(transaction) = transaction {
2831                        project_transaction.0.insert(buffer_to_edit, transaction);
2832                    }
2833                }
2834            }
2835        }
2836
2837        Ok(project_transaction)
2838    }
2839
2840    pub fn prepare_rename<T: ToPointUtf16>(
2841        &self,
2842        buffer: ModelHandle<Buffer>,
2843        position: T,
2844        cx: &mut ModelContext<Self>,
2845    ) -> Task<Result<Option<Range<Anchor>>>> {
2846        let position = position.to_point_utf16(buffer.read(cx));
2847        self.request_lsp(buffer, PrepareRename { position }, cx)
2848    }
2849
2850    pub fn perform_rename<T: ToPointUtf16>(
2851        &self,
2852        buffer: ModelHandle<Buffer>,
2853        position: T,
2854        new_name: String,
2855        push_to_history: bool,
2856        cx: &mut ModelContext<Self>,
2857    ) -> Task<Result<ProjectTransaction>> {
2858        let position = position.to_point_utf16(buffer.read(cx));
2859        self.request_lsp(
2860            buffer,
2861            PerformRename {
2862                position,
2863                new_name,
2864                push_to_history,
2865            },
2866            cx,
2867        )
2868    }
2869
2870    pub fn search(
2871        &self,
2872        query: SearchQuery,
2873        cx: &mut ModelContext<Self>,
2874    ) -> Task<Result<HashMap<ModelHandle<Buffer>, Vec<Range<Anchor>>>>> {
2875        if self.is_local() {
2876            let snapshots = self
2877                .visible_worktrees(cx)
2878                .filter_map(|tree| {
2879                    let tree = tree.read(cx).as_local()?;
2880                    Some(tree.snapshot())
2881                })
2882                .collect::<Vec<_>>();
2883
2884            let background = cx.background().clone();
2885            let path_count: usize = snapshots.iter().map(|s| s.visible_file_count()).sum();
2886            if path_count == 0 {
2887                return Task::ready(Ok(Default::default()));
2888            }
2889            let workers = background.num_cpus().min(path_count);
2890            let (matching_paths_tx, mut matching_paths_rx) = smol::channel::bounded(1024);
2891            cx.background()
2892                .spawn({
2893                    let fs = self.fs.clone();
2894                    let background = cx.background().clone();
2895                    let query = query.clone();
2896                    async move {
2897                        let fs = &fs;
2898                        let query = &query;
2899                        let matching_paths_tx = &matching_paths_tx;
2900                        let paths_per_worker = (path_count + workers - 1) / workers;
2901                        let snapshots = &snapshots;
2902                        background
2903                            .scoped(|scope| {
2904                                for worker_ix in 0..workers {
2905                                    let worker_start_ix = worker_ix * paths_per_worker;
2906                                    let worker_end_ix = worker_start_ix + paths_per_worker;
2907                                    scope.spawn(async move {
2908                                        let mut snapshot_start_ix = 0;
2909                                        let mut abs_path = PathBuf::new();
2910                                        for snapshot in snapshots {
2911                                            let snapshot_end_ix =
2912                                                snapshot_start_ix + snapshot.visible_file_count();
2913                                            if worker_end_ix <= snapshot_start_ix {
2914                                                break;
2915                                            } else if worker_start_ix > snapshot_end_ix {
2916                                                snapshot_start_ix = snapshot_end_ix;
2917                                                continue;
2918                                            } else {
2919                                                let start_in_snapshot = worker_start_ix
2920                                                    .saturating_sub(snapshot_start_ix);
2921                                                let end_in_snapshot =
2922                                                    cmp::min(worker_end_ix, snapshot_end_ix)
2923                                                        - snapshot_start_ix;
2924
2925                                                for entry in snapshot
2926                                                    .files(false, start_in_snapshot)
2927                                                    .take(end_in_snapshot - start_in_snapshot)
2928                                                {
2929                                                    if matching_paths_tx.is_closed() {
2930                                                        break;
2931                                                    }
2932
2933                                                    abs_path.clear();
2934                                                    abs_path.push(&snapshot.abs_path());
2935                                                    abs_path.push(&entry.path);
2936                                                    let matches = if let Some(file) =
2937                                                        fs.open_sync(&abs_path).await.log_err()
2938                                                    {
2939                                                        query.detect(file).unwrap_or(false)
2940                                                    } else {
2941                                                        false
2942                                                    };
2943
2944                                                    if matches {
2945                                                        let project_path =
2946                                                            (snapshot.id(), entry.path.clone());
2947                                                        if matching_paths_tx
2948                                                            .send(project_path)
2949                                                            .await
2950                                                            .is_err()
2951                                                        {
2952                                                            break;
2953                                                        }
2954                                                    }
2955                                                }
2956
2957                                                snapshot_start_ix = snapshot_end_ix;
2958                                            }
2959                                        }
2960                                    });
2961                                }
2962                            })
2963                            .await;
2964                    }
2965                })
2966                .detach();
2967
2968            let (buffers_tx, buffers_rx) = smol::channel::bounded(1024);
2969            let open_buffers = self
2970                .opened_buffers
2971                .values()
2972                .filter_map(|b| b.upgrade(cx))
2973                .collect::<HashSet<_>>();
2974            cx.spawn(|this, cx| async move {
2975                for buffer in &open_buffers {
2976                    let snapshot = buffer.read_with(&cx, |buffer, _| buffer.snapshot());
2977                    buffers_tx.send((buffer.clone(), snapshot)).await?;
2978                }
2979
2980                let open_buffers = Rc::new(RefCell::new(open_buffers));
2981                while let Some(project_path) = matching_paths_rx.next().await {
2982                    if buffers_tx.is_closed() {
2983                        break;
2984                    }
2985
2986                    let this = this.clone();
2987                    let open_buffers = open_buffers.clone();
2988                    let buffers_tx = buffers_tx.clone();
2989                    cx.spawn(|mut cx| async move {
2990                        if let Some(buffer) = this
2991                            .update(&mut cx, |this, cx| this.open_buffer(project_path, cx))
2992                            .await
2993                            .log_err()
2994                        {
2995                            if open_buffers.borrow_mut().insert(buffer.clone()) {
2996                                let snapshot = buffer.read_with(&cx, |buffer, _| buffer.snapshot());
2997                                buffers_tx.send((buffer, snapshot)).await?;
2998                            }
2999                        }
3000
3001                        Ok::<_, anyhow::Error>(())
3002                    })
3003                    .detach();
3004                }
3005
3006                Ok::<_, anyhow::Error>(())
3007            })
3008            .detach_and_log_err(cx);
3009
3010            let background = cx.background().clone();
3011            cx.background().spawn(async move {
3012                let query = &query;
3013                let mut matched_buffers = Vec::new();
3014                for _ in 0..workers {
3015                    matched_buffers.push(HashMap::default());
3016                }
3017                background
3018                    .scoped(|scope| {
3019                        for worker_matched_buffers in matched_buffers.iter_mut() {
3020                            let mut buffers_rx = buffers_rx.clone();
3021                            scope.spawn(async move {
3022                                while let Some((buffer, snapshot)) = buffers_rx.next().await {
3023                                    let buffer_matches = query
3024                                        .search(snapshot.as_rope())
3025                                        .await
3026                                        .iter()
3027                                        .map(|range| {
3028                                            snapshot.anchor_before(range.start)
3029                                                ..snapshot.anchor_after(range.end)
3030                                        })
3031                                        .collect::<Vec<_>>();
3032                                    if !buffer_matches.is_empty() {
3033                                        worker_matched_buffers
3034                                            .insert(buffer.clone(), buffer_matches);
3035                                    }
3036                                }
3037                            });
3038                        }
3039                    })
3040                    .await;
3041                Ok(matched_buffers.into_iter().flatten().collect())
3042            })
3043        } else if let Some(project_id) = self.remote_id() {
3044            let request = self.client.request(query.to_proto(project_id));
3045            cx.spawn(|this, mut cx| async move {
3046                let response = request.await?;
3047                let mut result = HashMap::default();
3048                for location in response.locations {
3049                    let buffer = location.buffer.ok_or_else(|| anyhow!("missing buffer"))?;
3050                    let target_buffer = this
3051                        .update(&mut cx, |this, cx| this.deserialize_buffer(buffer, cx))
3052                        .await?;
3053                    let start = location
3054                        .start
3055                        .and_then(deserialize_anchor)
3056                        .ok_or_else(|| anyhow!("missing target start"))?;
3057                    let end = location
3058                        .end
3059                        .and_then(deserialize_anchor)
3060                        .ok_or_else(|| anyhow!("missing target end"))?;
3061                    result
3062                        .entry(target_buffer)
3063                        .or_insert(Vec::new())
3064                        .push(start..end)
3065                }
3066                Ok(result)
3067            })
3068        } else {
3069            Task::ready(Ok(Default::default()))
3070        }
3071    }
3072
3073    fn request_lsp<R: LspCommand>(
3074        &self,
3075        buffer_handle: ModelHandle<Buffer>,
3076        request: R,
3077        cx: &mut ModelContext<Self>,
3078    ) -> Task<Result<R::Response>>
3079    where
3080        <R::LspRequest as lsp::request::Request>::Result: Send,
3081    {
3082        let buffer = buffer_handle.read(cx);
3083        if self.is_local() {
3084            let file = File::from_dyn(buffer.file()).and_then(File::as_local);
3085            if let Some((file, (_, language_server))) =
3086                file.zip(self.language_server_for_buffer(buffer, cx).cloned())
3087            {
3088                let lsp_params = request.to_lsp(&file.abs_path(cx), cx);
3089                return cx.spawn(|this, cx| async move {
3090                    if !request.check_capabilities(&language_server.capabilities()) {
3091                        return Ok(Default::default());
3092                    }
3093
3094                    let response = language_server
3095                        .request::<R::LspRequest>(lsp_params)
3096                        .await
3097                        .context("lsp request failed")?;
3098                    request
3099                        .response_from_lsp(response, this, buffer_handle, cx)
3100                        .await
3101                });
3102            }
3103        } else if let Some(project_id) = self.remote_id() {
3104            let rpc = self.client.clone();
3105            let message = request.to_proto(project_id, buffer);
3106            return cx.spawn(|this, cx| async move {
3107                let response = rpc.request(message).await?;
3108                request
3109                    .response_from_proto(response, this, buffer_handle, cx)
3110                    .await
3111            });
3112        }
3113        Task::ready(Ok(Default::default()))
3114    }
3115
3116    pub fn find_or_create_local_worktree(
3117        &mut self,
3118        abs_path: impl AsRef<Path>,
3119        visible: bool,
3120        cx: &mut ModelContext<Self>,
3121    ) -> Task<Result<(ModelHandle<Worktree>, PathBuf)>> {
3122        let abs_path = abs_path.as_ref();
3123        if let Some((tree, relative_path)) = self.find_local_worktree(abs_path, cx) {
3124            Task::ready(Ok((tree.clone(), relative_path.into())))
3125        } else {
3126            let worktree = self.create_local_worktree(abs_path, visible, cx);
3127            cx.foreground()
3128                .spawn(async move { Ok((worktree.await?, PathBuf::new())) })
3129        }
3130    }
3131
3132    pub fn find_local_worktree(
3133        &self,
3134        abs_path: &Path,
3135        cx: &AppContext,
3136    ) -> Option<(ModelHandle<Worktree>, PathBuf)> {
3137        for tree in self.worktrees(cx) {
3138            if let Some(relative_path) = tree
3139                .read(cx)
3140                .as_local()
3141                .and_then(|t| abs_path.strip_prefix(t.abs_path()).ok())
3142            {
3143                return Some((tree.clone(), relative_path.into()));
3144            }
3145        }
3146        None
3147    }
3148
3149    pub fn is_shared(&self) -> bool {
3150        match &self.client_state {
3151            ProjectClientState::Local { is_shared, .. } => *is_shared,
3152            ProjectClientState::Remote { .. } => false,
3153        }
3154    }
3155
3156    fn create_local_worktree(
3157        &mut self,
3158        abs_path: impl AsRef<Path>,
3159        visible: bool,
3160        cx: &mut ModelContext<Self>,
3161    ) -> Task<Result<ModelHandle<Worktree>>> {
3162        let fs = self.fs.clone();
3163        let client = self.client.clone();
3164        let next_entry_id = self.next_entry_id.clone();
3165        let path: Arc<Path> = abs_path.as_ref().into();
3166        let task = self
3167            .loading_local_worktrees
3168            .entry(path.clone())
3169            .or_insert_with(|| {
3170                cx.spawn(|project, mut cx| {
3171                    async move {
3172                        let worktree = Worktree::local(
3173                            client.clone(),
3174                            path.clone(),
3175                            visible,
3176                            fs,
3177                            next_entry_id,
3178                            &mut cx,
3179                        )
3180                        .await;
3181                        project.update(&mut cx, |project, _| {
3182                            project.loading_local_worktrees.remove(&path);
3183                        });
3184                        let worktree = worktree?;
3185
3186                        let (remote_project_id, is_shared) =
3187                            project.update(&mut cx, |project, cx| {
3188                                project.add_worktree(&worktree, cx);
3189                                (project.remote_id(), project.is_shared())
3190                            });
3191
3192                        if let Some(project_id) = remote_project_id {
3193                            if is_shared {
3194                                worktree
3195                                    .update(&mut cx, |worktree, cx| {
3196                                        worktree.as_local_mut().unwrap().share(project_id, cx)
3197                                    })
3198                                    .await?;
3199                            } else {
3200                                worktree
3201                                    .update(&mut cx, |worktree, cx| {
3202                                        worktree.as_local_mut().unwrap().register(project_id, cx)
3203                                    })
3204                                    .await?;
3205                            }
3206                        }
3207
3208                        Ok(worktree)
3209                    }
3210                    .map_err(|err| Arc::new(err))
3211                })
3212                .shared()
3213            })
3214            .clone();
3215        cx.foreground().spawn(async move {
3216            match task.await {
3217                Ok(worktree) => Ok(worktree),
3218                Err(err) => Err(anyhow!("{}", err)),
3219            }
3220        })
3221    }
3222
3223    pub fn remove_worktree(&mut self, id: WorktreeId, cx: &mut ModelContext<Self>) {
3224        self.worktrees.retain(|worktree| {
3225            worktree
3226                .upgrade(cx)
3227                .map_or(false, |w| w.read(cx).id() != id)
3228        });
3229        cx.notify();
3230    }
3231
3232    fn add_worktree(&mut self, worktree: &ModelHandle<Worktree>, cx: &mut ModelContext<Self>) {
3233        cx.observe(&worktree, |_, _, cx| cx.notify()).detach();
3234        if worktree.read(cx).is_local() {
3235            cx.subscribe(&worktree, |this, worktree, _, cx| {
3236                this.update_local_worktree_buffers(worktree, cx);
3237            })
3238            .detach();
3239        }
3240
3241        let push_strong_handle = {
3242            let worktree = worktree.read(cx);
3243            self.is_shared() || worktree.is_visible() || worktree.is_remote()
3244        };
3245        if push_strong_handle {
3246            self.worktrees
3247                .push(WorktreeHandle::Strong(worktree.clone()));
3248        } else {
3249            cx.observe_release(&worktree, |this, _, cx| {
3250                this.worktrees
3251                    .retain(|worktree| worktree.upgrade(cx).is_some());
3252                cx.notify();
3253            })
3254            .detach();
3255            self.worktrees
3256                .push(WorktreeHandle::Weak(worktree.downgrade()));
3257        }
3258        cx.notify();
3259    }
3260
3261    fn update_local_worktree_buffers(
3262        &mut self,
3263        worktree_handle: ModelHandle<Worktree>,
3264        cx: &mut ModelContext<Self>,
3265    ) {
3266        let snapshot = worktree_handle.read(cx).snapshot();
3267        let mut buffers_to_delete = Vec::new();
3268        for (buffer_id, buffer) in &self.opened_buffers {
3269            if let Some(buffer) = buffer.upgrade(cx) {
3270                buffer.update(cx, |buffer, cx| {
3271                    if let Some(old_file) = File::from_dyn(buffer.file()) {
3272                        if old_file.worktree != worktree_handle {
3273                            return;
3274                        }
3275
3276                        let new_file = if let Some(entry) = old_file
3277                            .entry_id
3278                            .and_then(|entry_id| snapshot.entry_for_id(entry_id))
3279                        {
3280                            File {
3281                                is_local: true,
3282                                entry_id: Some(entry.id),
3283                                mtime: entry.mtime,
3284                                path: entry.path.clone(),
3285                                worktree: worktree_handle.clone(),
3286                            }
3287                        } else if let Some(entry) =
3288                            snapshot.entry_for_path(old_file.path().as_ref())
3289                        {
3290                            File {
3291                                is_local: true,
3292                                entry_id: Some(entry.id),
3293                                mtime: entry.mtime,
3294                                path: entry.path.clone(),
3295                                worktree: worktree_handle.clone(),
3296                            }
3297                        } else {
3298                            File {
3299                                is_local: true,
3300                                entry_id: None,
3301                                path: old_file.path().clone(),
3302                                mtime: old_file.mtime(),
3303                                worktree: worktree_handle.clone(),
3304                            }
3305                        };
3306
3307                        if let Some(project_id) = self.remote_id() {
3308                            self.client
3309                                .send(proto::UpdateBufferFile {
3310                                    project_id,
3311                                    buffer_id: *buffer_id as u64,
3312                                    file: Some(new_file.to_proto()),
3313                                })
3314                                .log_err();
3315                        }
3316                        buffer.file_updated(Box::new(new_file), cx).detach();
3317                    }
3318                });
3319            } else {
3320                buffers_to_delete.push(*buffer_id);
3321            }
3322        }
3323
3324        for buffer_id in buffers_to_delete {
3325            self.opened_buffers.remove(&buffer_id);
3326        }
3327    }
3328
3329    pub fn set_active_path(&mut self, entry: Option<ProjectPath>, cx: &mut ModelContext<Self>) {
3330        let new_active_entry = entry.and_then(|project_path| {
3331            let worktree = self.worktree_for_id(project_path.worktree_id, cx)?;
3332            let entry = worktree.read(cx).entry_for_path(project_path.path)?;
3333            Some(entry.id)
3334        });
3335        if new_active_entry != self.active_entry {
3336            self.active_entry = new_active_entry;
3337            cx.emit(Event::ActiveEntryChanged(new_active_entry));
3338        }
3339    }
3340
3341    pub fn is_running_disk_based_diagnostics(&self) -> bool {
3342        self.language_servers_with_diagnostics_running > 0
3343    }
3344
3345    pub fn diagnostic_summary(&self, cx: &AppContext) -> DiagnosticSummary {
3346        let mut summary = DiagnosticSummary::default();
3347        for (_, path_summary) in self.diagnostic_summaries(cx) {
3348            summary.error_count += path_summary.error_count;
3349            summary.warning_count += path_summary.warning_count;
3350            summary.info_count += path_summary.info_count;
3351            summary.hint_count += path_summary.hint_count;
3352        }
3353        summary
3354    }
3355
3356    pub fn diagnostic_summaries<'a>(
3357        &'a self,
3358        cx: &'a AppContext,
3359    ) -> impl Iterator<Item = (ProjectPath, DiagnosticSummary)> + 'a {
3360        self.worktrees(cx).flat_map(move |worktree| {
3361            let worktree = worktree.read(cx);
3362            let worktree_id = worktree.id();
3363            worktree
3364                .diagnostic_summaries()
3365                .map(move |(path, summary)| (ProjectPath { worktree_id, path }, summary))
3366        })
3367    }
3368
3369    pub fn disk_based_diagnostics_started(&mut self, cx: &mut ModelContext<Self>) {
3370        self.language_servers_with_diagnostics_running += 1;
3371        if self.language_servers_with_diagnostics_running == 1 {
3372            cx.emit(Event::DiskBasedDiagnosticsStarted);
3373        }
3374    }
3375
3376    pub fn disk_based_diagnostics_finished(&mut self, cx: &mut ModelContext<Self>) {
3377        cx.emit(Event::DiskBasedDiagnosticsUpdated);
3378        self.language_servers_with_diagnostics_running -= 1;
3379        if self.language_servers_with_diagnostics_running == 0 {
3380            cx.emit(Event::DiskBasedDiagnosticsFinished);
3381        }
3382    }
3383
3384    pub fn active_entry(&self) -> Option<ProjectEntryId> {
3385        self.active_entry
3386    }
3387
3388    pub fn entry_for_path(&self, path: &ProjectPath, cx: &AppContext) -> Option<ProjectEntryId> {
3389        self.worktree_for_id(path.worktree_id, cx)?
3390            .read(cx)
3391            .entry_for_path(&path.path)
3392            .map(|entry| entry.id)
3393    }
3394
3395    pub fn path_for_entry(&self, entry_id: ProjectEntryId, cx: &AppContext) -> Option<ProjectPath> {
3396        let worktree = self.worktree_for_entry(entry_id, cx)?;
3397        let worktree = worktree.read(cx);
3398        let worktree_id = worktree.id();
3399        let path = worktree.entry_for_id(entry_id)?.path.clone();
3400        Some(ProjectPath { worktree_id, path })
3401    }
3402
3403    // RPC message handlers
3404
3405    async fn handle_unshare_project(
3406        this: ModelHandle<Self>,
3407        _: TypedEnvelope<proto::UnshareProject>,
3408        _: Arc<Client>,
3409        mut cx: AsyncAppContext,
3410    ) -> Result<()> {
3411        this.update(&mut cx, |this, cx| this.project_unshared(cx));
3412        Ok(())
3413    }
3414
3415    async fn handle_add_collaborator(
3416        this: ModelHandle<Self>,
3417        mut envelope: TypedEnvelope<proto::AddProjectCollaborator>,
3418        _: Arc<Client>,
3419        mut cx: AsyncAppContext,
3420    ) -> Result<()> {
3421        let user_store = this.read_with(&cx, |this, _| this.user_store.clone());
3422        let collaborator = envelope
3423            .payload
3424            .collaborator
3425            .take()
3426            .ok_or_else(|| anyhow!("empty collaborator"))?;
3427
3428        let collaborator = Collaborator::from_proto(collaborator, &user_store, &mut cx).await?;
3429        this.update(&mut cx, |this, cx| {
3430            this.collaborators
3431                .insert(collaborator.peer_id, collaborator);
3432            cx.notify();
3433        });
3434
3435        Ok(())
3436    }
3437
3438    async fn handle_remove_collaborator(
3439        this: ModelHandle<Self>,
3440        envelope: TypedEnvelope<proto::RemoveProjectCollaborator>,
3441        _: Arc<Client>,
3442        mut cx: AsyncAppContext,
3443    ) -> Result<()> {
3444        this.update(&mut cx, |this, cx| {
3445            let peer_id = PeerId(envelope.payload.peer_id);
3446            let replica_id = this
3447                .collaborators
3448                .remove(&peer_id)
3449                .ok_or_else(|| anyhow!("unknown peer {:?}", peer_id))?
3450                .replica_id;
3451            for (_, buffer) in &this.opened_buffers {
3452                if let Some(buffer) = buffer.upgrade(cx) {
3453                    buffer.update(cx, |buffer, cx| buffer.remove_peer(replica_id, cx));
3454                }
3455            }
3456            cx.emit(Event::CollaboratorLeft(peer_id));
3457            cx.notify();
3458            Ok(())
3459        })
3460    }
3461
3462    async fn handle_register_worktree(
3463        this: ModelHandle<Self>,
3464        envelope: TypedEnvelope<proto::RegisterWorktree>,
3465        client: Arc<Client>,
3466        mut cx: AsyncAppContext,
3467    ) -> Result<()> {
3468        this.update(&mut cx, |this, cx| {
3469            let remote_id = this.remote_id().ok_or_else(|| anyhow!("invalid project"))?;
3470            let replica_id = this.replica_id();
3471            let worktree = proto::Worktree {
3472                id: envelope.payload.worktree_id,
3473                root_name: envelope.payload.root_name,
3474                entries: Default::default(),
3475                diagnostic_summaries: Default::default(),
3476                visible: envelope.payload.visible,
3477            };
3478            let (worktree, load_task) =
3479                Worktree::remote(remote_id, replica_id, worktree, client, cx);
3480            this.add_worktree(&worktree, cx);
3481            load_task.detach();
3482            Ok(())
3483        })
3484    }
3485
3486    async fn handle_unregister_worktree(
3487        this: ModelHandle<Self>,
3488        envelope: TypedEnvelope<proto::UnregisterWorktree>,
3489        _: Arc<Client>,
3490        mut cx: AsyncAppContext,
3491    ) -> Result<()> {
3492        this.update(&mut cx, |this, cx| {
3493            let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
3494            this.remove_worktree(worktree_id, cx);
3495            Ok(())
3496        })
3497    }
3498
3499    async fn handle_update_worktree(
3500        this: ModelHandle<Self>,
3501        envelope: TypedEnvelope<proto::UpdateWorktree>,
3502        _: Arc<Client>,
3503        mut cx: AsyncAppContext,
3504    ) -> Result<()> {
3505        this.update(&mut cx, |this, cx| {
3506            let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
3507            if let Some(worktree) = this.worktree_for_id(worktree_id, cx) {
3508                worktree.update(cx, |worktree, _| {
3509                    let worktree = worktree.as_remote_mut().unwrap();
3510                    worktree.update_from_remote(envelope)
3511                })?;
3512            }
3513            Ok(())
3514        })
3515    }
3516
3517    async fn handle_update_diagnostic_summary(
3518        this: ModelHandle<Self>,
3519        envelope: TypedEnvelope<proto::UpdateDiagnosticSummary>,
3520        _: Arc<Client>,
3521        mut cx: AsyncAppContext,
3522    ) -> Result<()> {
3523        this.update(&mut cx, |this, cx| {
3524            let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
3525            if let Some(worktree) = this.worktree_for_id(worktree_id, cx) {
3526                if let Some(summary) = envelope.payload.summary {
3527                    let project_path = ProjectPath {
3528                        worktree_id,
3529                        path: Path::new(&summary.path).into(),
3530                    };
3531                    worktree.update(cx, |worktree, _| {
3532                        worktree
3533                            .as_remote_mut()
3534                            .unwrap()
3535                            .update_diagnostic_summary(project_path.path.clone(), &summary);
3536                    });
3537                    cx.emit(Event::DiagnosticsUpdated(project_path));
3538                }
3539            }
3540            Ok(())
3541        })
3542    }
3543
3544    async fn handle_start_language_server(
3545        this: ModelHandle<Self>,
3546        envelope: TypedEnvelope<proto::StartLanguageServer>,
3547        _: Arc<Client>,
3548        mut cx: AsyncAppContext,
3549    ) -> Result<()> {
3550        let server = envelope
3551            .payload
3552            .server
3553            .ok_or_else(|| anyhow!("invalid server"))?;
3554        this.update(&mut cx, |this, cx| {
3555            this.language_server_statuses.insert(
3556                server.id as usize,
3557                LanguageServerStatus {
3558                    name: server.name,
3559                    pending_work: Default::default(),
3560                    pending_diagnostic_updates: 0,
3561                },
3562            );
3563            cx.notify();
3564        });
3565        Ok(())
3566    }
3567
3568    async fn handle_update_language_server(
3569        this: ModelHandle<Self>,
3570        envelope: TypedEnvelope<proto::UpdateLanguageServer>,
3571        _: Arc<Client>,
3572        mut cx: AsyncAppContext,
3573    ) -> Result<()> {
3574        let language_server_id = envelope.payload.language_server_id as usize;
3575        match envelope
3576            .payload
3577            .variant
3578            .ok_or_else(|| anyhow!("invalid variant"))?
3579        {
3580            proto::update_language_server::Variant::WorkStart(payload) => {
3581                this.update(&mut cx, |this, cx| {
3582                    this.on_lsp_work_start(language_server_id, payload.token, cx);
3583                })
3584            }
3585            proto::update_language_server::Variant::WorkProgress(payload) => {
3586                this.update(&mut cx, |this, cx| {
3587                    this.on_lsp_work_progress(
3588                        language_server_id,
3589                        payload.token,
3590                        LanguageServerProgress {
3591                            message: payload.message,
3592                            percentage: payload.percentage.map(|p| p as usize),
3593                            last_update_at: Instant::now(),
3594                        },
3595                        cx,
3596                    );
3597                })
3598            }
3599            proto::update_language_server::Variant::WorkEnd(payload) => {
3600                this.update(&mut cx, |this, cx| {
3601                    this.on_lsp_work_end(language_server_id, payload.token, cx);
3602                })
3603            }
3604            proto::update_language_server::Variant::DiskBasedDiagnosticsUpdating(_) => {
3605                this.update(&mut cx, |this, cx| {
3606                    this.disk_based_diagnostics_started(cx);
3607                })
3608            }
3609            proto::update_language_server::Variant::DiskBasedDiagnosticsUpdated(_) => {
3610                this.update(&mut cx, |this, cx| this.disk_based_diagnostics_finished(cx));
3611            }
3612        }
3613
3614        Ok(())
3615    }
3616
3617    async fn handle_update_buffer(
3618        this: ModelHandle<Self>,
3619        envelope: TypedEnvelope<proto::UpdateBuffer>,
3620        _: Arc<Client>,
3621        mut cx: AsyncAppContext,
3622    ) -> Result<()> {
3623        this.update(&mut cx, |this, cx| {
3624            let payload = envelope.payload.clone();
3625            let buffer_id = payload.buffer_id;
3626            let ops = payload
3627                .operations
3628                .into_iter()
3629                .map(|op| language::proto::deserialize_operation(op))
3630                .collect::<Result<Vec<_>, _>>()?;
3631            match this.opened_buffers.entry(buffer_id) {
3632                hash_map::Entry::Occupied(mut e) => match e.get_mut() {
3633                    OpenBuffer::Strong(buffer) => {
3634                        buffer.update(cx, |buffer, cx| buffer.apply_ops(ops, cx))?;
3635                    }
3636                    OpenBuffer::Loading(operations) => operations.extend_from_slice(&ops),
3637                    OpenBuffer::Weak(_) => {}
3638                },
3639                hash_map::Entry::Vacant(e) => {
3640                    e.insert(OpenBuffer::Loading(ops));
3641                }
3642            }
3643            Ok(())
3644        })
3645    }
3646
3647    async fn handle_update_buffer_file(
3648        this: ModelHandle<Self>,
3649        envelope: TypedEnvelope<proto::UpdateBufferFile>,
3650        _: Arc<Client>,
3651        mut cx: AsyncAppContext,
3652    ) -> Result<()> {
3653        this.update(&mut cx, |this, cx| {
3654            let payload = envelope.payload.clone();
3655            let buffer_id = payload.buffer_id;
3656            let file = payload.file.ok_or_else(|| anyhow!("invalid file"))?;
3657            let worktree = this
3658                .worktree_for_id(WorktreeId::from_proto(file.worktree_id), cx)
3659                .ok_or_else(|| anyhow!("no such worktree"))?;
3660            let file = File::from_proto(file, worktree.clone(), cx)?;
3661            let buffer = this
3662                .opened_buffers
3663                .get_mut(&buffer_id)
3664                .and_then(|b| b.upgrade(cx))
3665                .ok_or_else(|| anyhow!("no such buffer"))?;
3666            buffer.update(cx, |buffer, cx| {
3667                buffer.file_updated(Box::new(file), cx).detach();
3668            });
3669            Ok(())
3670        })
3671    }
3672
3673    async fn handle_save_buffer(
3674        this: ModelHandle<Self>,
3675        envelope: TypedEnvelope<proto::SaveBuffer>,
3676        _: Arc<Client>,
3677        mut cx: AsyncAppContext,
3678    ) -> Result<proto::BufferSaved> {
3679        let buffer_id = envelope.payload.buffer_id;
3680        let requested_version = deserialize_version(envelope.payload.version);
3681
3682        let (project_id, buffer) = this.update(&mut cx, |this, cx| {
3683            let project_id = this.remote_id().ok_or_else(|| anyhow!("not connected"))?;
3684            let buffer = this
3685                .opened_buffers
3686                .get(&buffer_id)
3687                .map(|buffer| buffer.upgrade(cx).unwrap())
3688                .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))?;
3689            Ok::<_, anyhow::Error>((project_id, buffer))
3690        })?;
3691        buffer
3692            .update(&mut cx, |buffer, _| {
3693                buffer.wait_for_version(requested_version)
3694            })
3695            .await;
3696
3697        let (saved_version, mtime) = buffer.update(&mut cx, |buffer, cx| buffer.save(cx)).await?;
3698        Ok(proto::BufferSaved {
3699            project_id,
3700            buffer_id,
3701            version: serialize_version(&saved_version),
3702            mtime: Some(mtime.into()),
3703        })
3704    }
3705
3706    async fn handle_format_buffers(
3707        this: ModelHandle<Self>,
3708        envelope: TypedEnvelope<proto::FormatBuffers>,
3709        _: Arc<Client>,
3710        mut cx: AsyncAppContext,
3711    ) -> Result<proto::FormatBuffersResponse> {
3712        let sender_id = envelope.original_sender_id()?;
3713        let format = this.update(&mut cx, |this, cx| {
3714            let mut buffers = HashSet::default();
3715            for buffer_id in &envelope.payload.buffer_ids {
3716                buffers.insert(
3717                    this.opened_buffers
3718                        .get(buffer_id)
3719                        .map(|buffer| buffer.upgrade(cx).unwrap())
3720                        .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))?,
3721                );
3722            }
3723            Ok::<_, anyhow::Error>(this.format(buffers, false, cx))
3724        })?;
3725
3726        let project_transaction = format.await?;
3727        let project_transaction = this.update(&mut cx, |this, cx| {
3728            this.serialize_project_transaction_for_peer(project_transaction, sender_id, cx)
3729        });
3730        Ok(proto::FormatBuffersResponse {
3731            transaction: Some(project_transaction),
3732        })
3733    }
3734
3735    async fn handle_get_completions(
3736        this: ModelHandle<Self>,
3737        envelope: TypedEnvelope<proto::GetCompletions>,
3738        _: Arc<Client>,
3739        mut cx: AsyncAppContext,
3740    ) -> Result<proto::GetCompletionsResponse> {
3741        let position = envelope
3742            .payload
3743            .position
3744            .and_then(language::proto::deserialize_anchor)
3745            .ok_or_else(|| anyhow!("invalid position"))?;
3746        let version = deserialize_version(envelope.payload.version);
3747        let buffer = this.read_with(&cx, |this, cx| {
3748            this.opened_buffers
3749                .get(&envelope.payload.buffer_id)
3750                .map(|buffer| buffer.upgrade(cx).unwrap())
3751                .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))
3752        })?;
3753        buffer
3754            .update(&mut cx, |buffer, _| buffer.wait_for_version(version))
3755            .await;
3756        let version = buffer.read_with(&cx, |buffer, _| buffer.version());
3757        let completions = this
3758            .update(&mut cx, |this, cx| this.completions(&buffer, position, cx))
3759            .await?;
3760
3761        Ok(proto::GetCompletionsResponse {
3762            completions: completions
3763                .iter()
3764                .map(language::proto::serialize_completion)
3765                .collect(),
3766            version: serialize_version(&version),
3767        })
3768    }
3769
3770    async fn handle_apply_additional_edits_for_completion(
3771        this: ModelHandle<Self>,
3772        envelope: TypedEnvelope<proto::ApplyCompletionAdditionalEdits>,
3773        _: Arc<Client>,
3774        mut cx: AsyncAppContext,
3775    ) -> Result<proto::ApplyCompletionAdditionalEditsResponse> {
3776        let apply_additional_edits = this.update(&mut cx, |this, cx| {
3777            let buffer = this
3778                .opened_buffers
3779                .get(&envelope.payload.buffer_id)
3780                .map(|buffer| buffer.upgrade(cx).unwrap())
3781                .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))?;
3782            let language = buffer.read(cx).language();
3783            let completion = language::proto::deserialize_completion(
3784                envelope
3785                    .payload
3786                    .completion
3787                    .ok_or_else(|| anyhow!("invalid completion"))?,
3788                language,
3789            )?;
3790            Ok::<_, anyhow::Error>(
3791                this.apply_additional_edits_for_completion(buffer, completion, false, cx),
3792            )
3793        })?;
3794
3795        Ok(proto::ApplyCompletionAdditionalEditsResponse {
3796            transaction: apply_additional_edits
3797                .await?
3798                .as_ref()
3799                .map(language::proto::serialize_transaction),
3800        })
3801    }
3802
3803    async fn handle_get_code_actions(
3804        this: ModelHandle<Self>,
3805        envelope: TypedEnvelope<proto::GetCodeActions>,
3806        _: Arc<Client>,
3807        mut cx: AsyncAppContext,
3808    ) -> Result<proto::GetCodeActionsResponse> {
3809        let start = envelope
3810            .payload
3811            .start
3812            .and_then(language::proto::deserialize_anchor)
3813            .ok_or_else(|| anyhow!("invalid start"))?;
3814        let end = envelope
3815            .payload
3816            .end
3817            .and_then(language::proto::deserialize_anchor)
3818            .ok_or_else(|| anyhow!("invalid end"))?;
3819        let buffer = this.update(&mut cx, |this, cx| {
3820            this.opened_buffers
3821                .get(&envelope.payload.buffer_id)
3822                .map(|buffer| buffer.upgrade(cx).unwrap())
3823                .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))
3824        })?;
3825        buffer
3826            .update(&mut cx, |buffer, _| {
3827                buffer.wait_for_version(deserialize_version(envelope.payload.version))
3828            })
3829            .await;
3830
3831        let version = buffer.read_with(&cx, |buffer, _| buffer.version());
3832        let code_actions = this.update(&mut cx, |this, cx| {
3833            Ok::<_, anyhow::Error>(this.code_actions(&buffer, start..end, cx))
3834        })?;
3835
3836        Ok(proto::GetCodeActionsResponse {
3837            actions: code_actions
3838                .await?
3839                .iter()
3840                .map(language::proto::serialize_code_action)
3841                .collect(),
3842            version: serialize_version(&version),
3843        })
3844    }
3845
3846    async fn handle_apply_code_action(
3847        this: ModelHandle<Self>,
3848        envelope: TypedEnvelope<proto::ApplyCodeAction>,
3849        _: Arc<Client>,
3850        mut cx: AsyncAppContext,
3851    ) -> Result<proto::ApplyCodeActionResponse> {
3852        let sender_id = envelope.original_sender_id()?;
3853        let action = language::proto::deserialize_code_action(
3854            envelope
3855                .payload
3856                .action
3857                .ok_or_else(|| anyhow!("invalid action"))?,
3858        )?;
3859        let apply_code_action = this.update(&mut cx, |this, cx| {
3860            let buffer = this
3861                .opened_buffers
3862                .get(&envelope.payload.buffer_id)
3863                .map(|buffer| buffer.upgrade(cx).unwrap())
3864                .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))?;
3865            Ok::<_, anyhow::Error>(this.apply_code_action(buffer, action, false, cx))
3866        })?;
3867
3868        let project_transaction = apply_code_action.await?;
3869        let project_transaction = this.update(&mut cx, |this, cx| {
3870            this.serialize_project_transaction_for_peer(project_transaction, sender_id, cx)
3871        });
3872        Ok(proto::ApplyCodeActionResponse {
3873            transaction: Some(project_transaction),
3874        })
3875    }
3876
3877    async fn handle_lsp_command<T: LspCommand>(
3878        this: ModelHandle<Self>,
3879        envelope: TypedEnvelope<T::ProtoRequest>,
3880        _: Arc<Client>,
3881        mut cx: AsyncAppContext,
3882    ) -> Result<<T::ProtoRequest as proto::RequestMessage>::Response>
3883    where
3884        <T::LspRequest as lsp::request::Request>::Result: Send,
3885    {
3886        let sender_id = envelope.original_sender_id()?;
3887        let buffer_id = T::buffer_id_from_proto(&envelope.payload);
3888        let buffer_handle = this.read_with(&cx, |this, _| {
3889            this.opened_buffers
3890                .get(&buffer_id)
3891                .and_then(|buffer| buffer.upgrade(&cx))
3892                .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))
3893        })?;
3894        let request = T::from_proto(
3895            envelope.payload,
3896            this.clone(),
3897            buffer_handle.clone(),
3898            cx.clone(),
3899        )
3900        .await?;
3901        let buffer_version = buffer_handle.read_with(&cx, |buffer, _| buffer.version());
3902        let response = this
3903            .update(&mut cx, |this, cx| {
3904                this.request_lsp(buffer_handle, request, cx)
3905            })
3906            .await?;
3907        this.update(&mut cx, |this, cx| {
3908            Ok(T::response_to_proto(
3909                response,
3910                this,
3911                sender_id,
3912                &buffer_version,
3913                cx,
3914            ))
3915        })
3916    }
3917
3918    async fn handle_get_project_symbols(
3919        this: ModelHandle<Self>,
3920        envelope: TypedEnvelope<proto::GetProjectSymbols>,
3921        _: Arc<Client>,
3922        mut cx: AsyncAppContext,
3923    ) -> Result<proto::GetProjectSymbolsResponse> {
3924        let symbols = this
3925            .update(&mut cx, |this, cx| {
3926                this.symbols(&envelope.payload.query, cx)
3927            })
3928            .await?;
3929
3930        Ok(proto::GetProjectSymbolsResponse {
3931            symbols: symbols.iter().map(serialize_symbol).collect(),
3932        })
3933    }
3934
3935    async fn handle_search_project(
3936        this: ModelHandle<Self>,
3937        envelope: TypedEnvelope<proto::SearchProject>,
3938        _: Arc<Client>,
3939        mut cx: AsyncAppContext,
3940    ) -> Result<proto::SearchProjectResponse> {
3941        let peer_id = envelope.original_sender_id()?;
3942        let query = SearchQuery::from_proto(envelope.payload)?;
3943        let result = this
3944            .update(&mut cx, |this, cx| this.search(query, cx))
3945            .await?;
3946
3947        this.update(&mut cx, |this, cx| {
3948            let mut locations = Vec::new();
3949            for (buffer, ranges) in result {
3950                for range in ranges {
3951                    let start = serialize_anchor(&range.start);
3952                    let end = serialize_anchor(&range.end);
3953                    let buffer = this.serialize_buffer_for_peer(&buffer, peer_id, cx);
3954                    locations.push(proto::Location {
3955                        buffer: Some(buffer),
3956                        start: Some(start),
3957                        end: Some(end),
3958                    });
3959                }
3960            }
3961            Ok(proto::SearchProjectResponse { locations })
3962        })
3963    }
3964
3965    async fn handle_open_buffer_for_symbol(
3966        this: ModelHandle<Self>,
3967        envelope: TypedEnvelope<proto::OpenBufferForSymbol>,
3968        _: Arc<Client>,
3969        mut cx: AsyncAppContext,
3970    ) -> Result<proto::OpenBufferForSymbolResponse> {
3971        let peer_id = envelope.original_sender_id()?;
3972        let symbol = envelope
3973            .payload
3974            .symbol
3975            .ok_or_else(|| anyhow!("invalid symbol"))?;
3976        let symbol = this.read_with(&cx, |this, _| {
3977            let symbol = this.deserialize_symbol(symbol)?;
3978            let signature = this.symbol_signature(symbol.worktree_id, &symbol.path);
3979            if signature == symbol.signature {
3980                Ok(symbol)
3981            } else {
3982                Err(anyhow!("invalid symbol signature"))
3983            }
3984        })?;
3985        let buffer = this
3986            .update(&mut cx, |this, cx| this.open_buffer_for_symbol(&symbol, cx))
3987            .await?;
3988
3989        Ok(proto::OpenBufferForSymbolResponse {
3990            buffer: Some(this.update(&mut cx, |this, cx| {
3991                this.serialize_buffer_for_peer(&buffer, peer_id, cx)
3992            })),
3993        })
3994    }
3995
3996    fn symbol_signature(&self, worktree_id: WorktreeId, path: &Path) -> [u8; 32] {
3997        let mut hasher = Sha256::new();
3998        hasher.update(worktree_id.to_proto().to_be_bytes());
3999        hasher.update(path.to_string_lossy().as_bytes());
4000        hasher.update(self.nonce.to_be_bytes());
4001        hasher.finalize().as_slice().try_into().unwrap()
4002    }
4003
4004    async fn handle_open_buffer_by_id(
4005        this: ModelHandle<Self>,
4006        envelope: TypedEnvelope<proto::OpenBufferById>,
4007        _: Arc<Client>,
4008        mut cx: AsyncAppContext,
4009    ) -> Result<proto::OpenBufferResponse> {
4010        let peer_id = envelope.original_sender_id()?;
4011        let buffer = this
4012            .update(&mut cx, |this, cx| {
4013                this.open_buffer_by_id(envelope.payload.id, cx)
4014            })
4015            .await?;
4016        this.update(&mut cx, |this, cx| {
4017            Ok(proto::OpenBufferResponse {
4018                buffer: Some(this.serialize_buffer_for_peer(&buffer, peer_id, cx)),
4019            })
4020        })
4021    }
4022
4023    async fn handle_open_buffer_by_path(
4024        this: ModelHandle<Self>,
4025        envelope: TypedEnvelope<proto::OpenBufferByPath>,
4026        _: Arc<Client>,
4027        mut cx: AsyncAppContext,
4028    ) -> Result<proto::OpenBufferResponse> {
4029        let peer_id = envelope.original_sender_id()?;
4030        let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
4031        let open_buffer = this.update(&mut cx, |this, cx| {
4032            this.open_buffer(
4033                ProjectPath {
4034                    worktree_id,
4035                    path: PathBuf::from(envelope.payload.path).into(),
4036                },
4037                cx,
4038            )
4039        });
4040
4041        let buffer = open_buffer.await?;
4042        this.update(&mut cx, |this, cx| {
4043            Ok(proto::OpenBufferResponse {
4044                buffer: Some(this.serialize_buffer_for_peer(&buffer, peer_id, cx)),
4045            })
4046        })
4047    }
4048
4049    fn serialize_project_transaction_for_peer(
4050        &mut self,
4051        project_transaction: ProjectTransaction,
4052        peer_id: PeerId,
4053        cx: &AppContext,
4054    ) -> proto::ProjectTransaction {
4055        let mut serialized_transaction = proto::ProjectTransaction {
4056            buffers: Default::default(),
4057            transactions: Default::default(),
4058        };
4059        for (buffer, transaction) in project_transaction.0 {
4060            serialized_transaction
4061                .buffers
4062                .push(self.serialize_buffer_for_peer(&buffer, peer_id, cx));
4063            serialized_transaction
4064                .transactions
4065                .push(language::proto::serialize_transaction(&transaction));
4066        }
4067        serialized_transaction
4068    }
4069
4070    fn deserialize_project_transaction(
4071        &mut self,
4072        message: proto::ProjectTransaction,
4073        push_to_history: bool,
4074        cx: &mut ModelContext<Self>,
4075    ) -> Task<Result<ProjectTransaction>> {
4076        cx.spawn(|this, mut cx| async move {
4077            let mut project_transaction = ProjectTransaction::default();
4078            for (buffer, transaction) in message.buffers.into_iter().zip(message.transactions) {
4079                let buffer = this
4080                    .update(&mut cx, |this, cx| this.deserialize_buffer(buffer, cx))
4081                    .await?;
4082                let transaction = language::proto::deserialize_transaction(transaction)?;
4083                project_transaction.0.insert(buffer, transaction);
4084            }
4085
4086            for (buffer, transaction) in &project_transaction.0 {
4087                buffer
4088                    .update(&mut cx, |buffer, _| {
4089                        buffer.wait_for_edits(transaction.edit_ids.iter().copied())
4090                    })
4091                    .await;
4092
4093                if push_to_history {
4094                    buffer.update(&mut cx, |buffer, _| {
4095                        buffer.push_transaction(transaction.clone(), Instant::now());
4096                    });
4097                }
4098            }
4099
4100            Ok(project_transaction)
4101        })
4102    }
4103
4104    fn serialize_buffer_for_peer(
4105        &mut self,
4106        buffer: &ModelHandle<Buffer>,
4107        peer_id: PeerId,
4108        cx: &AppContext,
4109    ) -> proto::Buffer {
4110        let buffer_id = buffer.read(cx).remote_id();
4111        let shared_buffers = self.shared_buffers.entry(peer_id).or_default();
4112        if shared_buffers.insert(buffer_id) {
4113            proto::Buffer {
4114                variant: Some(proto::buffer::Variant::State(buffer.read(cx).to_proto())),
4115            }
4116        } else {
4117            proto::Buffer {
4118                variant: Some(proto::buffer::Variant::Id(buffer_id)),
4119            }
4120        }
4121    }
4122
4123    fn deserialize_buffer(
4124        &mut self,
4125        buffer: proto::Buffer,
4126        cx: &mut ModelContext<Self>,
4127    ) -> Task<Result<ModelHandle<Buffer>>> {
4128        let replica_id = self.replica_id();
4129
4130        let opened_buffer_tx = self.opened_buffer.0.clone();
4131        let mut opened_buffer_rx = self.opened_buffer.1.clone();
4132        cx.spawn(|this, mut cx| async move {
4133            match buffer.variant.ok_or_else(|| anyhow!("missing buffer"))? {
4134                proto::buffer::Variant::Id(id) => {
4135                    let buffer = loop {
4136                        let buffer = this.read_with(&cx, |this, cx| {
4137                            this.opened_buffers
4138                                .get(&id)
4139                                .and_then(|buffer| buffer.upgrade(cx))
4140                        });
4141                        if let Some(buffer) = buffer {
4142                            break buffer;
4143                        }
4144                        opened_buffer_rx
4145                            .next()
4146                            .await
4147                            .ok_or_else(|| anyhow!("project dropped while waiting for buffer"))?;
4148                    };
4149                    Ok(buffer)
4150                }
4151                proto::buffer::Variant::State(mut buffer) => {
4152                    let mut buffer_worktree = None;
4153                    let mut buffer_file = None;
4154                    if let Some(file) = buffer.file.take() {
4155                        this.read_with(&cx, |this, cx| {
4156                            let worktree_id = WorktreeId::from_proto(file.worktree_id);
4157                            let worktree =
4158                                this.worktree_for_id(worktree_id, cx).ok_or_else(|| {
4159                                    anyhow!("no worktree found for id {}", file.worktree_id)
4160                                })?;
4161                            buffer_file =
4162                                Some(Box::new(File::from_proto(file, worktree.clone(), cx)?)
4163                                    as Box<dyn language::File>);
4164                            buffer_worktree = Some(worktree);
4165                            Ok::<_, anyhow::Error>(())
4166                        })?;
4167                    }
4168
4169                    let buffer = cx.add_model(|cx| {
4170                        Buffer::from_proto(replica_id, buffer, buffer_file, cx).unwrap()
4171                    });
4172
4173                    this.update(&mut cx, |this, cx| this.register_buffer(&buffer, cx))?;
4174
4175                    *opened_buffer_tx.borrow_mut().borrow_mut() = ();
4176                    Ok(buffer)
4177                }
4178            }
4179        })
4180    }
4181
4182    fn deserialize_symbol(&self, serialized_symbol: proto::Symbol) -> Result<Symbol> {
4183        let source_worktree_id = WorktreeId::from_proto(serialized_symbol.source_worktree_id);
4184        let worktree_id = WorktreeId::from_proto(serialized_symbol.worktree_id);
4185        let start = serialized_symbol
4186            .start
4187            .ok_or_else(|| anyhow!("invalid start"))?;
4188        let end = serialized_symbol
4189            .end
4190            .ok_or_else(|| anyhow!("invalid end"))?;
4191        let kind = unsafe { mem::transmute(serialized_symbol.kind) };
4192        let path = PathBuf::from(serialized_symbol.path);
4193        let language = self.languages.select_language(&path);
4194        Ok(Symbol {
4195            source_worktree_id,
4196            worktree_id,
4197            language_server_name: LanguageServerName(serialized_symbol.language_server_name.into()),
4198            label: language
4199                .and_then(|language| language.label_for_symbol(&serialized_symbol.name, kind))
4200                .unwrap_or_else(|| CodeLabel::plain(serialized_symbol.name.clone(), None)),
4201            name: serialized_symbol.name,
4202            path,
4203            range: PointUtf16::new(start.row, start.column)..PointUtf16::new(end.row, end.column),
4204            kind,
4205            signature: serialized_symbol
4206                .signature
4207                .try_into()
4208                .map_err(|_| anyhow!("invalid signature"))?,
4209        })
4210    }
4211
4212    async fn handle_buffer_saved(
4213        this: ModelHandle<Self>,
4214        envelope: TypedEnvelope<proto::BufferSaved>,
4215        _: Arc<Client>,
4216        mut cx: AsyncAppContext,
4217    ) -> Result<()> {
4218        let version = deserialize_version(envelope.payload.version);
4219        let mtime = envelope
4220            .payload
4221            .mtime
4222            .ok_or_else(|| anyhow!("missing mtime"))?
4223            .into();
4224
4225        this.update(&mut cx, |this, cx| {
4226            let buffer = this
4227                .opened_buffers
4228                .get(&envelope.payload.buffer_id)
4229                .and_then(|buffer| buffer.upgrade(cx));
4230            if let Some(buffer) = buffer {
4231                buffer.update(cx, |buffer, cx| {
4232                    buffer.did_save(version, mtime, None, cx);
4233                });
4234            }
4235            Ok(())
4236        })
4237    }
4238
4239    async fn handle_buffer_reloaded(
4240        this: ModelHandle<Self>,
4241        envelope: TypedEnvelope<proto::BufferReloaded>,
4242        _: Arc<Client>,
4243        mut cx: AsyncAppContext,
4244    ) -> Result<()> {
4245        let payload = envelope.payload.clone();
4246        let version = deserialize_version(payload.version);
4247        let mtime = payload
4248            .mtime
4249            .ok_or_else(|| anyhow!("missing mtime"))?
4250            .into();
4251        this.update(&mut cx, |this, cx| {
4252            let buffer = this
4253                .opened_buffers
4254                .get(&payload.buffer_id)
4255                .and_then(|buffer| buffer.upgrade(cx));
4256            if let Some(buffer) = buffer {
4257                buffer.update(cx, |buffer, cx| {
4258                    buffer.did_reload(version, mtime, cx);
4259                });
4260            }
4261            Ok(())
4262        })
4263    }
4264
4265    pub fn match_paths<'a>(
4266        &self,
4267        query: &'a str,
4268        include_ignored: bool,
4269        smart_case: bool,
4270        max_results: usize,
4271        cancel_flag: &'a AtomicBool,
4272        cx: &AppContext,
4273    ) -> impl 'a + Future<Output = Vec<PathMatch>> {
4274        let worktrees = self
4275            .worktrees(cx)
4276            .filter(|worktree| worktree.read(cx).is_visible())
4277            .collect::<Vec<_>>();
4278        let include_root_name = worktrees.len() > 1;
4279        let candidate_sets = worktrees
4280            .into_iter()
4281            .map(|worktree| CandidateSet {
4282                snapshot: worktree.read(cx).snapshot(),
4283                include_ignored,
4284                include_root_name,
4285            })
4286            .collect::<Vec<_>>();
4287
4288        let background = cx.background().clone();
4289        async move {
4290            fuzzy::match_paths(
4291                candidate_sets.as_slice(),
4292                query,
4293                smart_case,
4294                max_results,
4295                cancel_flag,
4296                background,
4297            )
4298            .await
4299        }
4300    }
4301
4302    fn edits_from_lsp(
4303        &mut self,
4304        buffer: &ModelHandle<Buffer>,
4305        lsp_edits: impl 'static + Send + IntoIterator<Item = lsp::TextEdit>,
4306        version: Option<i32>,
4307        cx: &mut ModelContext<Self>,
4308    ) -> Task<Result<Vec<(Range<Anchor>, String)>>> {
4309        let snapshot = self.buffer_snapshot_for_lsp_version(buffer, version, cx);
4310        cx.background().spawn(async move {
4311            let snapshot = snapshot?;
4312            let mut lsp_edits = lsp_edits
4313                .into_iter()
4314                .map(|edit| (range_from_lsp(edit.range), edit.new_text))
4315                .peekable();
4316
4317            let mut edits = Vec::new();
4318            while let Some((mut range, mut new_text)) = lsp_edits.next() {
4319                // Combine any LSP edits that are adjacent.
4320                //
4321                // Also, combine LSP edits that are separated from each other by only
4322                // a newline. This is important because for some code actions,
4323                // Rust-analyzer rewrites the entire buffer via a series of edits that
4324                // are separated by unchanged newline characters.
4325                //
4326                // In order for the diffing logic below to work properly, any edits that
4327                // cancel each other out must be combined into one.
4328                while let Some((next_range, next_text)) = lsp_edits.peek() {
4329                    if next_range.start > range.end {
4330                        if next_range.start.row > range.end.row + 1
4331                            || next_range.start.column > 0
4332                            || snapshot.clip_point_utf16(
4333                                PointUtf16::new(range.end.row, u32::MAX),
4334                                Bias::Left,
4335                            ) > range.end
4336                        {
4337                            break;
4338                        }
4339                        new_text.push('\n');
4340                    }
4341                    range.end = next_range.end;
4342                    new_text.push_str(&next_text);
4343                    lsp_edits.next();
4344                }
4345
4346                if snapshot.clip_point_utf16(range.start, Bias::Left) != range.start
4347                    || snapshot.clip_point_utf16(range.end, Bias::Left) != range.end
4348                {
4349                    return Err(anyhow!("invalid edits received from language server"));
4350                }
4351
4352                // For multiline edits, perform a diff of the old and new text so that
4353                // we can identify the changes more precisely, preserving the locations
4354                // of any anchors positioned in the unchanged regions.
4355                if range.end.row > range.start.row {
4356                    let mut offset = range.start.to_offset(&snapshot);
4357                    let old_text = snapshot.text_for_range(range).collect::<String>();
4358
4359                    let diff = TextDiff::from_lines(old_text.as_str(), &new_text);
4360                    let mut moved_since_edit = true;
4361                    for change in diff.iter_all_changes() {
4362                        let tag = change.tag();
4363                        let value = change.value();
4364                        match tag {
4365                            ChangeTag::Equal => {
4366                                offset += value.len();
4367                                moved_since_edit = true;
4368                            }
4369                            ChangeTag::Delete => {
4370                                let start = snapshot.anchor_after(offset);
4371                                let end = snapshot.anchor_before(offset + value.len());
4372                                if moved_since_edit {
4373                                    edits.push((start..end, String::new()));
4374                                } else {
4375                                    edits.last_mut().unwrap().0.end = end;
4376                                }
4377                                offset += value.len();
4378                                moved_since_edit = false;
4379                            }
4380                            ChangeTag::Insert => {
4381                                if moved_since_edit {
4382                                    let anchor = snapshot.anchor_after(offset);
4383                                    edits.push((anchor.clone()..anchor, value.to_string()));
4384                                } else {
4385                                    edits.last_mut().unwrap().1.push_str(value);
4386                                }
4387                                moved_since_edit = false;
4388                            }
4389                        }
4390                    }
4391                } else if range.end == range.start {
4392                    let anchor = snapshot.anchor_after(range.start);
4393                    edits.push((anchor.clone()..anchor, new_text));
4394                } else {
4395                    let edit_start = snapshot.anchor_after(range.start);
4396                    let edit_end = snapshot.anchor_before(range.end);
4397                    edits.push((edit_start..edit_end, new_text));
4398                }
4399            }
4400
4401            Ok(edits)
4402        })
4403    }
4404
4405    fn buffer_snapshot_for_lsp_version(
4406        &mut self,
4407        buffer: &ModelHandle<Buffer>,
4408        version: Option<i32>,
4409        cx: &AppContext,
4410    ) -> Result<TextBufferSnapshot> {
4411        const OLD_VERSIONS_TO_RETAIN: i32 = 10;
4412
4413        if let Some(version) = version {
4414            let buffer_id = buffer.read(cx).remote_id();
4415            let snapshots = self
4416                .buffer_snapshots
4417                .get_mut(&buffer_id)
4418                .ok_or_else(|| anyhow!("no snapshot found for buffer {}", buffer_id))?;
4419            let mut found_snapshot = None;
4420            snapshots.retain(|(snapshot_version, snapshot)| {
4421                if snapshot_version + OLD_VERSIONS_TO_RETAIN < version {
4422                    false
4423                } else {
4424                    if *snapshot_version == version {
4425                        found_snapshot = Some(snapshot.clone());
4426                    }
4427                    true
4428                }
4429            });
4430
4431            found_snapshot.ok_or_else(|| {
4432                anyhow!(
4433                    "snapshot not found for buffer {} at version {}",
4434                    buffer_id,
4435                    version
4436                )
4437            })
4438        } else {
4439            Ok((buffer.read(cx)).text_snapshot())
4440        }
4441    }
4442
4443    fn language_server_for_buffer(
4444        &self,
4445        buffer: &Buffer,
4446        cx: &AppContext,
4447    ) -> Option<&(Arc<dyn LspAdapter>, Arc<LanguageServer>)> {
4448        if let Some((file, language)) = File::from_dyn(buffer.file()).zip(buffer.language()) {
4449            let worktree_id = file.worktree_id(cx);
4450            self.language_servers
4451                .get(&(worktree_id, language.lsp_adapter()?.name()))
4452        } else {
4453            None
4454        }
4455    }
4456}
4457
4458impl WorktreeHandle {
4459    pub fn upgrade(&self, cx: &AppContext) -> Option<ModelHandle<Worktree>> {
4460        match self {
4461            WorktreeHandle::Strong(handle) => Some(handle.clone()),
4462            WorktreeHandle::Weak(handle) => handle.upgrade(cx),
4463        }
4464    }
4465}
4466
4467impl OpenBuffer {
4468    pub fn upgrade(&self, cx: &impl UpgradeModelHandle) -> Option<ModelHandle<Buffer>> {
4469        match self {
4470            OpenBuffer::Strong(handle) => Some(handle.clone()),
4471            OpenBuffer::Weak(handle) => handle.upgrade(cx),
4472            OpenBuffer::Loading(_) => None,
4473        }
4474    }
4475}
4476
4477struct CandidateSet {
4478    snapshot: Snapshot,
4479    include_ignored: bool,
4480    include_root_name: bool,
4481}
4482
4483impl<'a> PathMatchCandidateSet<'a> for CandidateSet {
4484    type Candidates = CandidateSetIter<'a>;
4485
4486    fn id(&self) -> usize {
4487        self.snapshot.id().to_usize()
4488    }
4489
4490    fn len(&self) -> usize {
4491        if self.include_ignored {
4492            self.snapshot.file_count()
4493        } else {
4494            self.snapshot.visible_file_count()
4495        }
4496    }
4497
4498    fn prefix(&self) -> Arc<str> {
4499        if self.snapshot.root_entry().map_or(false, |e| e.is_file()) {
4500            self.snapshot.root_name().into()
4501        } else if self.include_root_name {
4502            format!("{}/", self.snapshot.root_name()).into()
4503        } else {
4504            "".into()
4505        }
4506    }
4507
4508    fn candidates(&'a self, start: usize) -> Self::Candidates {
4509        CandidateSetIter {
4510            traversal: self.snapshot.files(self.include_ignored, start),
4511        }
4512    }
4513}
4514
4515struct CandidateSetIter<'a> {
4516    traversal: Traversal<'a>,
4517}
4518
4519impl<'a> Iterator for CandidateSetIter<'a> {
4520    type Item = PathMatchCandidate<'a>;
4521
4522    fn next(&mut self) -> Option<Self::Item> {
4523        self.traversal.next().map(|entry| {
4524            if let EntryKind::File(char_bag) = entry.kind {
4525                PathMatchCandidate {
4526                    path: &entry.path,
4527                    char_bag,
4528                }
4529            } else {
4530                unreachable!()
4531            }
4532        })
4533    }
4534}
4535
4536impl Entity for Project {
4537    type Event = Event;
4538
4539    fn release(&mut self, _: &mut gpui::MutableAppContext) {
4540        match &self.client_state {
4541            ProjectClientState::Local { remote_id_rx, .. } => {
4542                if let Some(project_id) = *remote_id_rx.borrow() {
4543                    self.client
4544                        .send(proto::UnregisterProject { project_id })
4545                        .log_err();
4546                }
4547            }
4548            ProjectClientState::Remote { remote_id, .. } => {
4549                self.client
4550                    .send(proto::LeaveProject {
4551                        project_id: *remote_id,
4552                    })
4553                    .log_err();
4554            }
4555        }
4556    }
4557
4558    fn app_will_quit(
4559        &mut self,
4560        _: &mut MutableAppContext,
4561    ) -> Option<std::pin::Pin<Box<dyn 'static + Future<Output = ()>>>> {
4562        let shutdown_futures = self
4563            .language_servers
4564            .drain()
4565            .filter_map(|(_, (_, server))| server.shutdown())
4566            .collect::<Vec<_>>();
4567        Some(
4568            async move {
4569                futures::future::join_all(shutdown_futures).await;
4570            }
4571            .boxed(),
4572        )
4573    }
4574}
4575
4576impl Collaborator {
4577    fn from_proto(
4578        message: proto::Collaborator,
4579        user_store: &ModelHandle<UserStore>,
4580        cx: &mut AsyncAppContext,
4581    ) -> impl Future<Output = Result<Self>> {
4582        let user = user_store.update(cx, |user_store, cx| {
4583            user_store.fetch_user(message.user_id, cx)
4584        });
4585
4586        async move {
4587            Ok(Self {
4588                peer_id: PeerId(message.peer_id),
4589                user: user.await?,
4590                replica_id: message.replica_id as ReplicaId,
4591            })
4592        }
4593    }
4594}
4595
4596impl<P: AsRef<Path>> From<(WorktreeId, P)> for ProjectPath {
4597    fn from((worktree_id, path): (WorktreeId, P)) -> Self {
4598        Self {
4599            worktree_id,
4600            path: path.as_ref().into(),
4601        }
4602    }
4603}
4604
4605impl From<lsp::CreateFileOptions> for fs::CreateOptions {
4606    fn from(options: lsp::CreateFileOptions) -> Self {
4607        Self {
4608            overwrite: options.overwrite.unwrap_or(false),
4609            ignore_if_exists: options.ignore_if_exists.unwrap_or(false),
4610        }
4611    }
4612}
4613
4614impl From<lsp::RenameFileOptions> for fs::RenameOptions {
4615    fn from(options: lsp::RenameFileOptions) -> Self {
4616        Self {
4617            overwrite: options.overwrite.unwrap_or(false),
4618            ignore_if_exists: options.ignore_if_exists.unwrap_or(false),
4619        }
4620    }
4621}
4622
4623impl From<lsp::DeleteFileOptions> for fs::RemoveOptions {
4624    fn from(options: lsp::DeleteFileOptions) -> Self {
4625        Self {
4626            recursive: options.recursive.unwrap_or(false),
4627            ignore_if_not_exists: options.ignore_if_not_exists.unwrap_or(false),
4628        }
4629    }
4630}
4631
4632fn serialize_symbol(symbol: &Symbol) -> proto::Symbol {
4633    proto::Symbol {
4634        source_worktree_id: symbol.source_worktree_id.to_proto(),
4635        worktree_id: symbol.worktree_id.to_proto(),
4636        language_server_name: symbol.language_server_name.0.to_string(),
4637        name: symbol.name.clone(),
4638        kind: unsafe { mem::transmute(symbol.kind) },
4639        path: symbol.path.to_string_lossy().to_string(),
4640        start: Some(proto::Point {
4641            row: symbol.range.start.row,
4642            column: symbol.range.start.column,
4643        }),
4644        end: Some(proto::Point {
4645            row: symbol.range.end.row,
4646            column: symbol.range.end.column,
4647        }),
4648        signature: symbol.signature.to_vec(),
4649    }
4650}
4651
4652fn relativize_path(base: &Path, path: &Path) -> PathBuf {
4653    let mut path_components = path.components();
4654    let mut base_components = base.components();
4655    let mut components: Vec<Component> = Vec::new();
4656    loop {
4657        match (path_components.next(), base_components.next()) {
4658            (None, None) => break,
4659            (Some(a), None) => {
4660                components.push(a);
4661                components.extend(path_components.by_ref());
4662                break;
4663            }
4664            (None, _) => components.push(Component::ParentDir),
4665            (Some(a), Some(b)) if components.is_empty() && a == b => (),
4666            (Some(a), Some(b)) if b == Component::CurDir => components.push(a),
4667            (Some(a), Some(_)) => {
4668                components.push(Component::ParentDir);
4669                for _ in base_components {
4670                    components.push(Component::ParentDir);
4671                }
4672                components.push(a);
4673                components.extend(path_components.by_ref());
4674                break;
4675            }
4676        }
4677    }
4678    components.iter().map(|c| c.as_os_str()).collect()
4679}
4680
4681impl Item for Buffer {
4682    fn entry_id(&self, cx: &AppContext) -> Option<ProjectEntryId> {
4683        File::from_dyn(self.file()).and_then(|file| file.project_entry_id(cx))
4684    }
4685}
4686
4687#[cfg(test)]
4688mod tests {
4689    use super::{Event, *};
4690    use fs::RealFs;
4691    use futures::{future, StreamExt};
4692    use gpui::test::subscribe;
4693    use language::{
4694        tree_sitter_rust, Diagnostic, FakeLspAdapter, LanguageConfig, OffsetRangeExt, Point,
4695        ToPoint,
4696    };
4697    use lsp::Url;
4698    use serde_json::json;
4699    use std::{cell::RefCell, os::unix, path::PathBuf, rc::Rc};
4700    use unindent::Unindent as _;
4701    use util::{assert_set_eq, test::temp_tree};
4702    use worktree::WorktreeHandle as _;
4703
4704    #[gpui::test]
4705    async fn test_populate_and_search(cx: &mut gpui::TestAppContext) {
4706        let dir = temp_tree(json!({
4707            "root": {
4708                "apple": "",
4709                "banana": {
4710                    "carrot": {
4711                        "date": "",
4712                        "endive": "",
4713                    }
4714                },
4715                "fennel": {
4716                    "grape": "",
4717                }
4718            }
4719        }));
4720
4721        let root_link_path = dir.path().join("root_link");
4722        unix::fs::symlink(&dir.path().join("root"), &root_link_path).unwrap();
4723        unix::fs::symlink(
4724            &dir.path().join("root/fennel"),
4725            &dir.path().join("root/finnochio"),
4726        )
4727        .unwrap();
4728
4729        let project = Project::test(Arc::new(RealFs), cx);
4730
4731        let (tree, _) = project
4732            .update(cx, |project, cx| {
4733                project.find_or_create_local_worktree(&root_link_path, true, cx)
4734            })
4735            .await
4736            .unwrap();
4737
4738        cx.read(|cx| tree.read(cx).as_local().unwrap().scan_complete())
4739            .await;
4740        cx.read(|cx| {
4741            let tree = tree.read(cx);
4742            assert_eq!(tree.file_count(), 5);
4743            assert_eq!(
4744                tree.inode_for_path("fennel/grape"),
4745                tree.inode_for_path("finnochio/grape")
4746            );
4747        });
4748
4749        let cancel_flag = Default::default();
4750        let results = project
4751            .read_with(cx, |project, cx| {
4752                project.match_paths("bna", false, false, 10, &cancel_flag, cx)
4753            })
4754            .await;
4755        assert_eq!(
4756            results
4757                .into_iter()
4758                .map(|result| result.path)
4759                .collect::<Vec<Arc<Path>>>(),
4760            vec![
4761                PathBuf::from("banana/carrot/date").into(),
4762                PathBuf::from("banana/carrot/endive").into(),
4763            ]
4764        );
4765    }
4766
4767    #[gpui::test]
4768    async fn test_managing_language_servers(cx: &mut gpui::TestAppContext) {
4769        cx.foreground().forbid_parking();
4770
4771        let mut rust_language = Language::new(
4772            LanguageConfig {
4773                name: "Rust".into(),
4774                path_suffixes: vec!["rs".to_string()],
4775                ..Default::default()
4776            },
4777            Some(tree_sitter_rust::language()),
4778        );
4779        let mut json_language = Language::new(
4780            LanguageConfig {
4781                name: "JSON".into(),
4782                path_suffixes: vec!["json".to_string()],
4783                ..Default::default()
4784            },
4785            None,
4786        );
4787        let mut fake_rust_servers = rust_language.set_fake_lsp_adapter(FakeLspAdapter {
4788            name: "the-rust-language-server",
4789            capabilities: lsp::ServerCapabilities {
4790                completion_provider: Some(lsp::CompletionOptions {
4791                    trigger_characters: Some(vec![".".to_string(), "::".to_string()]),
4792                    ..Default::default()
4793                }),
4794                ..Default::default()
4795            },
4796            ..Default::default()
4797        });
4798        let mut fake_json_servers = json_language.set_fake_lsp_adapter(FakeLspAdapter {
4799            name: "the-json-language-server",
4800            capabilities: lsp::ServerCapabilities {
4801                completion_provider: Some(lsp::CompletionOptions {
4802                    trigger_characters: Some(vec![":".to_string()]),
4803                    ..Default::default()
4804                }),
4805                ..Default::default()
4806            },
4807            ..Default::default()
4808        });
4809
4810        let fs = FakeFs::new(cx.background());
4811        fs.insert_tree(
4812            "/the-root",
4813            json!({
4814                "test.rs": "const A: i32 = 1;",
4815                "test2.rs": "",
4816                "Cargo.toml": "a = 1",
4817                "package.json": "{\"a\": 1}",
4818            }),
4819        )
4820        .await;
4821
4822        let project = Project::test(fs, cx);
4823        project.update(cx, |project, _| {
4824            project.languages.add(Arc::new(rust_language));
4825            project.languages.add(Arc::new(json_language));
4826        });
4827
4828        let worktree_id = project
4829            .update(cx, |project, cx| {
4830                project.find_or_create_local_worktree("/the-root", true, cx)
4831            })
4832            .await
4833            .unwrap()
4834            .0
4835            .read_with(cx, |tree, _| tree.id());
4836
4837        // Open a buffer without an associated language server.
4838        let toml_buffer = project
4839            .update(cx, |project, cx| {
4840                project.open_buffer((worktree_id, "Cargo.toml"), cx)
4841            })
4842            .await
4843            .unwrap();
4844
4845        // Open a buffer with an associated language server.
4846        let rust_buffer = project
4847            .update(cx, |project, cx| {
4848                project.open_buffer((worktree_id, "test.rs"), cx)
4849            })
4850            .await
4851            .unwrap();
4852
4853        // A server is started up, and it is notified about Rust files.
4854        let mut fake_rust_server = fake_rust_servers.next().await.unwrap();
4855        assert_eq!(
4856            fake_rust_server
4857                .receive_notification::<lsp::notification::DidOpenTextDocument>()
4858                .await
4859                .text_document,
4860            lsp::TextDocumentItem {
4861                uri: lsp::Url::from_file_path("/the-root/test.rs").unwrap(),
4862                version: 0,
4863                text: "const A: i32 = 1;".to_string(),
4864                language_id: Default::default()
4865            }
4866        );
4867
4868        // The buffer is configured based on the language server's capabilities.
4869        rust_buffer.read_with(cx, |buffer, _| {
4870            assert_eq!(
4871                buffer.completion_triggers(),
4872                &[".".to_string(), "::".to_string()]
4873            );
4874        });
4875        toml_buffer.read_with(cx, |buffer, _| {
4876            assert!(buffer.completion_triggers().is_empty());
4877        });
4878
4879        // Edit a buffer. The changes are reported to the language server.
4880        rust_buffer.update(cx, |buffer, cx| buffer.edit([16..16], "2", cx));
4881        assert_eq!(
4882            fake_rust_server
4883                .receive_notification::<lsp::notification::DidChangeTextDocument>()
4884                .await
4885                .text_document,
4886            lsp::VersionedTextDocumentIdentifier::new(
4887                lsp::Url::from_file_path("/the-root/test.rs").unwrap(),
4888                1
4889            )
4890        );
4891
4892        // Open a third buffer with a different associated language server.
4893        let json_buffer = project
4894            .update(cx, |project, cx| {
4895                project.open_buffer((worktree_id, "package.json"), cx)
4896            })
4897            .await
4898            .unwrap();
4899
4900        // A json language server is started up and is only notified about the json buffer.
4901        let mut fake_json_server = fake_json_servers.next().await.unwrap();
4902        assert_eq!(
4903            fake_json_server
4904                .receive_notification::<lsp::notification::DidOpenTextDocument>()
4905                .await
4906                .text_document,
4907            lsp::TextDocumentItem {
4908                uri: lsp::Url::from_file_path("/the-root/package.json").unwrap(),
4909                version: 0,
4910                text: "{\"a\": 1}".to_string(),
4911                language_id: Default::default()
4912            }
4913        );
4914
4915        // This buffer is configured based on the second language server's
4916        // capabilities.
4917        json_buffer.read_with(cx, |buffer, _| {
4918            assert_eq!(buffer.completion_triggers(), &[":".to_string()]);
4919        });
4920
4921        // When opening another buffer whose language server is already running,
4922        // it is also configured based on the existing language server's capabilities.
4923        let rust_buffer2 = project
4924            .update(cx, |project, cx| {
4925                project.open_buffer((worktree_id, "test2.rs"), cx)
4926            })
4927            .await
4928            .unwrap();
4929        rust_buffer2.read_with(cx, |buffer, _| {
4930            assert_eq!(
4931                buffer.completion_triggers(),
4932                &[".".to_string(), "::".to_string()]
4933            );
4934        });
4935
4936        // Changes are reported only to servers matching the buffer's language.
4937        toml_buffer.update(cx, |buffer, cx| buffer.edit([5..5], "23", cx));
4938        rust_buffer2.update(cx, |buffer, cx| buffer.edit([0..0], "let x = 1;", cx));
4939        assert_eq!(
4940            fake_rust_server
4941                .receive_notification::<lsp::notification::DidChangeTextDocument>()
4942                .await
4943                .text_document,
4944            lsp::VersionedTextDocumentIdentifier::new(
4945                lsp::Url::from_file_path("/the-root/test2.rs").unwrap(),
4946                1
4947            )
4948        );
4949
4950        // Save notifications are reported to all servers.
4951        toml_buffer
4952            .update(cx, |buffer, cx| buffer.save(cx))
4953            .await
4954            .unwrap();
4955        assert_eq!(
4956            fake_rust_server
4957                .receive_notification::<lsp::notification::DidSaveTextDocument>()
4958                .await
4959                .text_document,
4960            lsp::TextDocumentIdentifier::new(
4961                lsp::Url::from_file_path("/the-root/Cargo.toml").unwrap()
4962            )
4963        );
4964        assert_eq!(
4965            fake_json_server
4966                .receive_notification::<lsp::notification::DidSaveTextDocument>()
4967                .await
4968                .text_document,
4969            lsp::TextDocumentIdentifier::new(
4970                lsp::Url::from_file_path("/the-root/Cargo.toml").unwrap()
4971            )
4972        );
4973
4974        // Restart language servers
4975        project.update(cx, |project, cx| {
4976            project.restart_language_servers_for_buffers(
4977                vec![rust_buffer.clone(), json_buffer.clone()],
4978                cx,
4979            );
4980        });
4981
4982        let mut rust_shutdown_requests = fake_rust_server
4983            .handle_request::<lsp::request::Shutdown, _, _>(|_, _| future::ready(Ok(())));
4984        let mut json_shutdown_requests = fake_json_server
4985            .handle_request::<lsp::request::Shutdown, _, _>(|_, _| future::ready(Ok(())));
4986        futures::join!(rust_shutdown_requests.next(), json_shutdown_requests.next());
4987
4988        let mut fake_rust_server = fake_rust_servers.next().await.unwrap();
4989        let mut fake_json_server = fake_json_servers.next().await.unwrap();
4990
4991        // Ensure both rust documents are reopened in new rust language server without worrying about order
4992        assert_set_eq!(
4993            [
4994                fake_rust_server
4995                    .receive_notification::<lsp::notification::DidOpenTextDocument>()
4996                    .await
4997                    .text_document,
4998                fake_rust_server
4999                    .receive_notification::<lsp::notification::DidOpenTextDocument>()
5000                    .await
5001                    .text_document,
5002            ],
5003            [
5004                lsp::TextDocumentItem {
5005                    uri: lsp::Url::from_file_path("/the-root/test.rs").unwrap(),
5006                    version: 1,
5007                    text: rust_buffer.read_with(cx, |buffer, _| buffer.text()),
5008                    language_id: Default::default()
5009                },
5010                lsp::TextDocumentItem {
5011                    uri: lsp::Url::from_file_path("/the-root/test2.rs").unwrap(),
5012                    version: 1,
5013                    text: rust_buffer2.read_with(cx, |buffer, _| buffer.text()),
5014                    language_id: Default::default()
5015                },
5016            ]
5017        );
5018
5019        // Ensure json document is reopened in new json language server
5020        assert_eq!(
5021            fake_json_server
5022                .receive_notification::<lsp::notification::DidOpenTextDocument>()
5023                .await
5024                .text_document,
5025            lsp::TextDocumentItem {
5026                uri: lsp::Url::from_file_path("/the-root/package.json").unwrap(),
5027                version: 0,
5028                text: json_buffer.read_with(cx, |buffer, _| buffer.text()),
5029                language_id: Default::default()
5030            }
5031        );
5032
5033        // Close notifications are reported only to servers matching the buffer's language.
5034        cx.update(|_| drop(json_buffer));
5035        let close_message = lsp::DidCloseTextDocumentParams {
5036            text_document: lsp::TextDocumentIdentifier::new(
5037                lsp::Url::from_file_path("/the-root/package.json").unwrap(),
5038            ),
5039        };
5040        assert_eq!(
5041            fake_json_server
5042                .receive_notification::<lsp::notification::DidCloseTextDocument>()
5043                .await,
5044            close_message,
5045        );
5046    }
5047
5048    #[gpui::test]
5049    async fn test_disk_based_diagnostics_progress(cx: &mut gpui::TestAppContext) {
5050        cx.foreground().forbid_parking();
5051
5052        let progress_token = "the-progress-token";
5053        let mut language = Language::new(
5054            LanguageConfig {
5055                name: "Rust".into(),
5056                path_suffixes: vec!["rs".to_string()],
5057                ..Default::default()
5058            },
5059            Some(tree_sitter_rust::language()),
5060        );
5061        let mut fake_servers = language.set_fake_lsp_adapter(FakeLspAdapter {
5062            disk_based_diagnostics_progress_token: Some(progress_token),
5063            disk_based_diagnostics_sources: &["disk"],
5064            ..Default::default()
5065        });
5066
5067        let fs = FakeFs::new(cx.background());
5068        fs.insert_tree(
5069            "/dir",
5070            json!({
5071                "a.rs": "fn a() { A }",
5072                "b.rs": "const y: i32 = 1",
5073            }),
5074        )
5075        .await;
5076
5077        let project = Project::test(fs, cx);
5078        project.update(cx, |project, _| project.languages.add(Arc::new(language)));
5079
5080        let (tree, _) = project
5081            .update(cx, |project, cx| {
5082                project.find_or_create_local_worktree("/dir", true, cx)
5083            })
5084            .await
5085            .unwrap();
5086        let worktree_id = tree.read_with(cx, |tree, _| tree.id());
5087
5088        cx.read(|cx| tree.read(cx).as_local().unwrap().scan_complete())
5089            .await;
5090
5091        // Cause worktree to start the fake language server
5092        let _buffer = project
5093            .update(cx, |project, cx| {
5094                project.open_buffer((worktree_id, Path::new("b.rs")), cx)
5095            })
5096            .await
5097            .unwrap();
5098
5099        let mut events = subscribe(&project, cx);
5100
5101        let mut fake_server = fake_servers.next().await.unwrap();
5102        fake_server.start_progress(progress_token).await;
5103        assert_eq!(
5104            events.next().await.unwrap(),
5105            Event::DiskBasedDiagnosticsStarted
5106        );
5107
5108        fake_server.start_progress(progress_token).await;
5109        fake_server.end_progress(progress_token).await;
5110        fake_server.start_progress(progress_token).await;
5111
5112        fake_server.notify::<lsp::notification::PublishDiagnostics>(
5113            lsp::PublishDiagnosticsParams {
5114                uri: Url::from_file_path("/dir/a.rs").unwrap(),
5115                version: None,
5116                diagnostics: vec![lsp::Diagnostic {
5117                    range: lsp::Range::new(lsp::Position::new(0, 9), lsp::Position::new(0, 10)),
5118                    severity: Some(lsp::DiagnosticSeverity::ERROR),
5119                    message: "undefined variable 'A'".to_string(),
5120                    ..Default::default()
5121                }],
5122            },
5123        );
5124        assert_eq!(
5125            events.next().await.unwrap(),
5126            Event::DiagnosticsUpdated((worktree_id, Path::new("a.rs")).into())
5127        );
5128
5129        fake_server.end_progress(progress_token).await;
5130        fake_server.end_progress(progress_token).await;
5131        assert_eq!(
5132            events.next().await.unwrap(),
5133            Event::DiskBasedDiagnosticsUpdated
5134        );
5135        assert_eq!(
5136            events.next().await.unwrap(),
5137            Event::DiskBasedDiagnosticsFinished
5138        );
5139
5140        let buffer = project
5141            .update(cx, |p, cx| p.open_buffer((worktree_id, "a.rs"), cx))
5142            .await
5143            .unwrap();
5144
5145        buffer.read_with(cx, |buffer, _| {
5146            let snapshot = buffer.snapshot();
5147            let diagnostics = snapshot
5148                .diagnostics_in_range::<_, Point>(0..buffer.len(), false)
5149                .collect::<Vec<_>>();
5150            assert_eq!(
5151                diagnostics,
5152                &[DiagnosticEntry {
5153                    range: Point::new(0, 9)..Point::new(0, 10),
5154                    diagnostic: Diagnostic {
5155                        severity: lsp::DiagnosticSeverity::ERROR,
5156                        message: "undefined variable 'A'".to_string(),
5157                        group_id: 0,
5158                        is_primary: true,
5159                        ..Default::default()
5160                    }
5161                }]
5162            )
5163        });
5164    }
5165
5166    #[gpui::test]
5167    async fn test_transforming_diagnostics(cx: &mut gpui::TestAppContext) {
5168        cx.foreground().forbid_parking();
5169
5170        let mut language = Language::new(
5171            LanguageConfig {
5172                name: "Rust".into(),
5173                path_suffixes: vec!["rs".to_string()],
5174                ..Default::default()
5175            },
5176            Some(tree_sitter_rust::language()),
5177        );
5178        let mut fake_servers = language.set_fake_lsp_adapter(FakeLspAdapter {
5179            disk_based_diagnostics_sources: &["disk"],
5180            ..Default::default()
5181        });
5182
5183        let text = "
5184            fn a() { A }
5185            fn b() { BB }
5186            fn c() { CCC }
5187        "
5188        .unindent();
5189
5190        let fs = FakeFs::new(cx.background());
5191        fs.insert_tree("/dir", json!({ "a.rs": text })).await;
5192
5193        let project = Project::test(fs, cx);
5194        project.update(cx, |project, _| project.languages.add(Arc::new(language)));
5195
5196        let worktree_id = project
5197            .update(cx, |project, cx| {
5198                project.find_or_create_local_worktree("/dir", true, cx)
5199            })
5200            .await
5201            .unwrap()
5202            .0
5203            .read_with(cx, |tree, _| tree.id());
5204
5205        let buffer = project
5206            .update(cx, |project, cx| {
5207                project.open_buffer((worktree_id, "a.rs"), cx)
5208            })
5209            .await
5210            .unwrap();
5211
5212        let mut fake_server = fake_servers.next().await.unwrap();
5213        let open_notification = fake_server
5214            .receive_notification::<lsp::notification::DidOpenTextDocument>()
5215            .await;
5216
5217        // Edit the buffer, moving the content down
5218        buffer.update(cx, |buffer, cx| buffer.edit([0..0], "\n\n", cx));
5219        let change_notification_1 = fake_server
5220            .receive_notification::<lsp::notification::DidChangeTextDocument>()
5221            .await;
5222        assert!(
5223            change_notification_1.text_document.version > open_notification.text_document.version
5224        );
5225
5226        // Report some diagnostics for the initial version of the buffer
5227        fake_server.notify::<lsp::notification::PublishDiagnostics>(
5228            lsp::PublishDiagnosticsParams {
5229                uri: lsp::Url::from_file_path("/dir/a.rs").unwrap(),
5230                version: Some(open_notification.text_document.version),
5231                diagnostics: vec![
5232                    lsp::Diagnostic {
5233                        range: lsp::Range::new(lsp::Position::new(0, 9), lsp::Position::new(0, 10)),
5234                        severity: Some(DiagnosticSeverity::ERROR),
5235                        message: "undefined variable 'A'".to_string(),
5236                        source: Some("disk".to_string()),
5237                        ..Default::default()
5238                    },
5239                    lsp::Diagnostic {
5240                        range: lsp::Range::new(lsp::Position::new(1, 9), lsp::Position::new(1, 11)),
5241                        severity: Some(DiagnosticSeverity::ERROR),
5242                        message: "undefined variable 'BB'".to_string(),
5243                        source: Some("disk".to_string()),
5244                        ..Default::default()
5245                    },
5246                    lsp::Diagnostic {
5247                        range: lsp::Range::new(lsp::Position::new(2, 9), lsp::Position::new(2, 12)),
5248                        severity: Some(DiagnosticSeverity::ERROR),
5249                        source: Some("disk".to_string()),
5250                        message: "undefined variable 'CCC'".to_string(),
5251                        ..Default::default()
5252                    },
5253                ],
5254            },
5255        );
5256
5257        // The diagnostics have moved down since they were created.
5258        buffer.next_notification(cx).await;
5259        buffer.read_with(cx, |buffer, _| {
5260            assert_eq!(
5261                buffer
5262                    .snapshot()
5263                    .diagnostics_in_range::<_, Point>(Point::new(3, 0)..Point::new(5, 0), false)
5264                    .collect::<Vec<_>>(),
5265                &[
5266                    DiagnosticEntry {
5267                        range: Point::new(3, 9)..Point::new(3, 11),
5268                        diagnostic: Diagnostic {
5269                            severity: DiagnosticSeverity::ERROR,
5270                            message: "undefined variable 'BB'".to_string(),
5271                            is_disk_based: true,
5272                            group_id: 1,
5273                            is_primary: true,
5274                            ..Default::default()
5275                        },
5276                    },
5277                    DiagnosticEntry {
5278                        range: Point::new(4, 9)..Point::new(4, 12),
5279                        diagnostic: Diagnostic {
5280                            severity: DiagnosticSeverity::ERROR,
5281                            message: "undefined variable 'CCC'".to_string(),
5282                            is_disk_based: true,
5283                            group_id: 2,
5284                            is_primary: true,
5285                            ..Default::default()
5286                        }
5287                    }
5288                ]
5289            );
5290            assert_eq!(
5291                chunks_with_diagnostics(buffer, 0..buffer.len()),
5292                [
5293                    ("\n\nfn a() { ".to_string(), None),
5294                    ("A".to_string(), Some(DiagnosticSeverity::ERROR)),
5295                    (" }\nfn b() { ".to_string(), None),
5296                    ("BB".to_string(), Some(DiagnosticSeverity::ERROR)),
5297                    (" }\nfn c() { ".to_string(), None),
5298                    ("CCC".to_string(), Some(DiagnosticSeverity::ERROR)),
5299                    (" }\n".to_string(), None),
5300                ]
5301            );
5302            assert_eq!(
5303                chunks_with_diagnostics(buffer, Point::new(3, 10)..Point::new(4, 11)),
5304                [
5305                    ("B".to_string(), Some(DiagnosticSeverity::ERROR)),
5306                    (" }\nfn c() { ".to_string(), None),
5307                    ("CC".to_string(), Some(DiagnosticSeverity::ERROR)),
5308                ]
5309            );
5310        });
5311
5312        // Ensure overlapping diagnostics are highlighted correctly.
5313        fake_server.notify::<lsp::notification::PublishDiagnostics>(
5314            lsp::PublishDiagnosticsParams {
5315                uri: lsp::Url::from_file_path("/dir/a.rs").unwrap(),
5316                version: Some(open_notification.text_document.version),
5317                diagnostics: vec![
5318                    lsp::Diagnostic {
5319                        range: lsp::Range::new(lsp::Position::new(0, 9), lsp::Position::new(0, 10)),
5320                        severity: Some(DiagnosticSeverity::ERROR),
5321                        message: "undefined variable 'A'".to_string(),
5322                        source: Some("disk".to_string()),
5323                        ..Default::default()
5324                    },
5325                    lsp::Diagnostic {
5326                        range: lsp::Range::new(lsp::Position::new(0, 9), lsp::Position::new(0, 12)),
5327                        severity: Some(DiagnosticSeverity::WARNING),
5328                        message: "unreachable statement".to_string(),
5329                        source: Some("disk".to_string()),
5330                        ..Default::default()
5331                    },
5332                ],
5333            },
5334        );
5335
5336        buffer.next_notification(cx).await;
5337        buffer.read_with(cx, |buffer, _| {
5338            assert_eq!(
5339                buffer
5340                    .snapshot()
5341                    .diagnostics_in_range::<_, Point>(Point::new(2, 0)..Point::new(3, 0), false)
5342                    .collect::<Vec<_>>(),
5343                &[
5344                    DiagnosticEntry {
5345                        range: Point::new(2, 9)..Point::new(2, 12),
5346                        diagnostic: Diagnostic {
5347                            severity: DiagnosticSeverity::WARNING,
5348                            message: "unreachable statement".to_string(),
5349                            is_disk_based: true,
5350                            group_id: 1,
5351                            is_primary: true,
5352                            ..Default::default()
5353                        }
5354                    },
5355                    DiagnosticEntry {
5356                        range: Point::new(2, 9)..Point::new(2, 10),
5357                        diagnostic: Diagnostic {
5358                            severity: DiagnosticSeverity::ERROR,
5359                            message: "undefined variable 'A'".to_string(),
5360                            is_disk_based: true,
5361                            group_id: 0,
5362                            is_primary: true,
5363                            ..Default::default()
5364                        },
5365                    }
5366                ]
5367            );
5368            assert_eq!(
5369                chunks_with_diagnostics(buffer, Point::new(2, 0)..Point::new(3, 0)),
5370                [
5371                    ("fn a() { ".to_string(), None),
5372                    ("A".to_string(), Some(DiagnosticSeverity::ERROR)),
5373                    (" }".to_string(), Some(DiagnosticSeverity::WARNING)),
5374                    ("\n".to_string(), None),
5375                ]
5376            );
5377            assert_eq!(
5378                chunks_with_diagnostics(buffer, Point::new(2, 10)..Point::new(3, 0)),
5379                [
5380                    (" }".to_string(), Some(DiagnosticSeverity::WARNING)),
5381                    ("\n".to_string(), None),
5382                ]
5383            );
5384        });
5385
5386        // Keep editing the buffer and ensure disk-based diagnostics get translated according to the
5387        // changes since the last save.
5388        buffer.update(cx, |buffer, cx| {
5389            buffer.edit(Some(Point::new(2, 0)..Point::new(2, 0)), "    ", cx);
5390            buffer.edit(Some(Point::new(2, 8)..Point::new(2, 10)), "(x: usize)", cx);
5391            buffer.edit(Some(Point::new(3, 10)..Point::new(3, 10)), "xxx", cx);
5392        });
5393        let change_notification_2 = fake_server
5394            .receive_notification::<lsp::notification::DidChangeTextDocument>()
5395            .await;
5396        assert!(
5397            change_notification_2.text_document.version
5398                > change_notification_1.text_document.version
5399        );
5400
5401        // Handle out-of-order diagnostics
5402        fake_server.notify::<lsp::notification::PublishDiagnostics>(
5403            lsp::PublishDiagnosticsParams {
5404                uri: lsp::Url::from_file_path("/dir/a.rs").unwrap(),
5405                version: Some(change_notification_2.text_document.version),
5406                diagnostics: vec![
5407                    lsp::Diagnostic {
5408                        range: lsp::Range::new(lsp::Position::new(1, 9), lsp::Position::new(1, 11)),
5409                        severity: Some(DiagnosticSeverity::ERROR),
5410                        message: "undefined variable 'BB'".to_string(),
5411                        source: Some("disk".to_string()),
5412                        ..Default::default()
5413                    },
5414                    lsp::Diagnostic {
5415                        range: lsp::Range::new(lsp::Position::new(0, 9), lsp::Position::new(0, 10)),
5416                        severity: Some(DiagnosticSeverity::WARNING),
5417                        message: "undefined variable 'A'".to_string(),
5418                        source: Some("disk".to_string()),
5419                        ..Default::default()
5420                    },
5421                ],
5422            },
5423        );
5424
5425        buffer.next_notification(cx).await;
5426        buffer.read_with(cx, |buffer, _| {
5427            assert_eq!(
5428                buffer
5429                    .snapshot()
5430                    .diagnostics_in_range::<_, Point>(0..buffer.len(), false)
5431                    .collect::<Vec<_>>(),
5432                &[
5433                    DiagnosticEntry {
5434                        range: Point::new(2, 21)..Point::new(2, 22),
5435                        diagnostic: Diagnostic {
5436                            severity: DiagnosticSeverity::WARNING,
5437                            message: "undefined variable 'A'".to_string(),
5438                            is_disk_based: true,
5439                            group_id: 1,
5440                            is_primary: true,
5441                            ..Default::default()
5442                        }
5443                    },
5444                    DiagnosticEntry {
5445                        range: Point::new(3, 9)..Point::new(3, 14),
5446                        diagnostic: Diagnostic {
5447                            severity: DiagnosticSeverity::ERROR,
5448                            message: "undefined variable 'BB'".to_string(),
5449                            is_disk_based: true,
5450                            group_id: 0,
5451                            is_primary: true,
5452                            ..Default::default()
5453                        },
5454                    }
5455                ]
5456            );
5457        });
5458    }
5459
5460    #[gpui::test]
5461    async fn test_empty_diagnostic_ranges(cx: &mut gpui::TestAppContext) {
5462        cx.foreground().forbid_parking();
5463
5464        let text = concat!(
5465            "let one = ;\n", //
5466            "let two = \n",
5467            "let three = 3;\n",
5468        );
5469
5470        let fs = FakeFs::new(cx.background());
5471        fs.insert_tree("/dir", json!({ "a.rs": text })).await;
5472
5473        let project = Project::test(fs, cx);
5474        let worktree_id = project
5475            .update(cx, |project, cx| {
5476                project.find_or_create_local_worktree("/dir", true, cx)
5477            })
5478            .await
5479            .unwrap()
5480            .0
5481            .read_with(cx, |tree, _| tree.id());
5482
5483        let buffer = project
5484            .update(cx, |project, cx| {
5485                project.open_buffer((worktree_id, "a.rs"), cx)
5486            })
5487            .await
5488            .unwrap();
5489
5490        project.update(cx, |project, cx| {
5491            project
5492                .update_buffer_diagnostics(
5493                    &buffer,
5494                    vec![
5495                        DiagnosticEntry {
5496                            range: PointUtf16::new(0, 10)..PointUtf16::new(0, 10),
5497                            diagnostic: Diagnostic {
5498                                severity: DiagnosticSeverity::ERROR,
5499                                message: "syntax error 1".to_string(),
5500                                ..Default::default()
5501                            },
5502                        },
5503                        DiagnosticEntry {
5504                            range: PointUtf16::new(1, 10)..PointUtf16::new(1, 10),
5505                            diagnostic: Diagnostic {
5506                                severity: DiagnosticSeverity::ERROR,
5507                                message: "syntax error 2".to_string(),
5508                                ..Default::default()
5509                            },
5510                        },
5511                    ],
5512                    None,
5513                    cx,
5514                )
5515                .unwrap();
5516        });
5517
5518        // An empty range is extended forward to include the following character.
5519        // At the end of a line, an empty range is extended backward to include
5520        // the preceding character.
5521        buffer.read_with(cx, |buffer, _| {
5522            let chunks = chunks_with_diagnostics(&buffer, 0..buffer.len());
5523            assert_eq!(
5524                chunks
5525                    .iter()
5526                    .map(|(s, d)| (s.as_str(), *d))
5527                    .collect::<Vec<_>>(),
5528                &[
5529                    ("let one = ", None),
5530                    (";", Some(DiagnosticSeverity::ERROR)),
5531                    ("\nlet two =", None),
5532                    (" ", Some(DiagnosticSeverity::ERROR)),
5533                    ("\nlet three = 3;\n", None)
5534                ]
5535            );
5536        });
5537    }
5538
5539    #[gpui::test]
5540    async fn test_edits_from_lsp_with_past_version(cx: &mut gpui::TestAppContext) {
5541        cx.foreground().forbid_parking();
5542
5543        let mut language = Language::new(
5544            LanguageConfig {
5545                name: "Rust".into(),
5546                path_suffixes: vec!["rs".to_string()],
5547                ..Default::default()
5548            },
5549            Some(tree_sitter_rust::language()),
5550        );
5551        let mut fake_servers = language.set_fake_lsp_adapter(Default::default());
5552
5553        let text = "
5554            fn a() {
5555                f1();
5556            }
5557            fn b() {
5558                f2();
5559            }
5560            fn c() {
5561                f3();
5562            }
5563        "
5564        .unindent();
5565
5566        let fs = FakeFs::new(cx.background());
5567        fs.insert_tree(
5568            "/dir",
5569            json!({
5570                "a.rs": text.clone(),
5571            }),
5572        )
5573        .await;
5574
5575        let project = Project::test(fs, cx);
5576        project.update(cx, |project, _| project.languages.add(Arc::new(language)));
5577
5578        let worktree_id = project
5579            .update(cx, |project, cx| {
5580                project.find_or_create_local_worktree("/dir", true, cx)
5581            })
5582            .await
5583            .unwrap()
5584            .0
5585            .read_with(cx, |tree, _| tree.id());
5586
5587        let buffer = project
5588            .update(cx, |project, cx| {
5589                project.open_buffer((worktree_id, "a.rs"), cx)
5590            })
5591            .await
5592            .unwrap();
5593
5594        let mut fake_server = fake_servers.next().await.unwrap();
5595        let lsp_document_version = fake_server
5596            .receive_notification::<lsp::notification::DidOpenTextDocument>()
5597            .await
5598            .text_document
5599            .version;
5600
5601        // Simulate editing the buffer after the language server computes some edits.
5602        buffer.update(cx, |buffer, cx| {
5603            buffer.edit(
5604                [Point::new(0, 0)..Point::new(0, 0)],
5605                "// above first function\n",
5606                cx,
5607            );
5608            buffer.edit(
5609                [Point::new(2, 0)..Point::new(2, 0)],
5610                "    // inside first function\n",
5611                cx,
5612            );
5613            buffer.edit(
5614                [Point::new(6, 4)..Point::new(6, 4)],
5615                "// inside second function ",
5616                cx,
5617            );
5618
5619            assert_eq!(
5620                buffer.text(),
5621                "
5622                    // above first function
5623                    fn a() {
5624                        // inside first function
5625                        f1();
5626                    }
5627                    fn b() {
5628                        // inside second function f2();
5629                    }
5630                    fn c() {
5631                        f3();
5632                    }
5633                "
5634                .unindent()
5635            );
5636        });
5637
5638        let edits = project
5639            .update(cx, |project, cx| {
5640                project.edits_from_lsp(
5641                    &buffer,
5642                    vec![
5643                        // replace body of first function
5644                        lsp::TextEdit {
5645                            range: lsp::Range::new(
5646                                lsp::Position::new(0, 0),
5647                                lsp::Position::new(3, 0),
5648                            ),
5649                            new_text: "
5650                                fn a() {
5651                                    f10();
5652                                }
5653                            "
5654                            .unindent(),
5655                        },
5656                        // edit inside second function
5657                        lsp::TextEdit {
5658                            range: lsp::Range::new(
5659                                lsp::Position::new(4, 6),
5660                                lsp::Position::new(4, 6),
5661                            ),
5662                            new_text: "00".into(),
5663                        },
5664                        // edit inside third function via two distinct edits
5665                        lsp::TextEdit {
5666                            range: lsp::Range::new(
5667                                lsp::Position::new(7, 5),
5668                                lsp::Position::new(7, 5),
5669                            ),
5670                            new_text: "4000".into(),
5671                        },
5672                        lsp::TextEdit {
5673                            range: lsp::Range::new(
5674                                lsp::Position::new(7, 5),
5675                                lsp::Position::new(7, 6),
5676                            ),
5677                            new_text: "".into(),
5678                        },
5679                    ],
5680                    Some(lsp_document_version),
5681                    cx,
5682                )
5683            })
5684            .await
5685            .unwrap();
5686
5687        buffer.update(cx, |buffer, cx| {
5688            for (range, new_text) in edits {
5689                buffer.edit([range], new_text, cx);
5690            }
5691            assert_eq!(
5692                buffer.text(),
5693                "
5694                    // above first function
5695                    fn a() {
5696                        // inside first function
5697                        f10();
5698                    }
5699                    fn b() {
5700                        // inside second function f200();
5701                    }
5702                    fn c() {
5703                        f4000();
5704                    }
5705                "
5706                .unindent()
5707            );
5708        });
5709    }
5710
5711    #[gpui::test]
5712    async fn test_edits_from_lsp_with_edits_on_adjacent_lines(cx: &mut gpui::TestAppContext) {
5713        cx.foreground().forbid_parking();
5714
5715        let text = "
5716            use a::b;
5717            use a::c;
5718
5719            fn f() {
5720                b();
5721                c();
5722            }
5723        "
5724        .unindent();
5725
5726        let fs = FakeFs::new(cx.background());
5727        fs.insert_tree(
5728            "/dir",
5729            json!({
5730                "a.rs": text.clone(),
5731            }),
5732        )
5733        .await;
5734
5735        let project = Project::test(fs, cx);
5736        let worktree_id = project
5737            .update(cx, |project, cx| {
5738                project.find_or_create_local_worktree("/dir", true, cx)
5739            })
5740            .await
5741            .unwrap()
5742            .0
5743            .read_with(cx, |tree, _| tree.id());
5744
5745        let buffer = project
5746            .update(cx, |project, cx| {
5747                project.open_buffer((worktree_id, "a.rs"), cx)
5748            })
5749            .await
5750            .unwrap();
5751
5752        // Simulate the language server sending us a small edit in the form of a very large diff.
5753        // Rust-analyzer does this when performing a merge-imports code action.
5754        let edits = project
5755            .update(cx, |project, cx| {
5756                project.edits_from_lsp(
5757                    &buffer,
5758                    [
5759                        // Replace the first use statement without editing the semicolon.
5760                        lsp::TextEdit {
5761                            range: lsp::Range::new(
5762                                lsp::Position::new(0, 4),
5763                                lsp::Position::new(0, 8),
5764                            ),
5765                            new_text: "a::{b, c}".into(),
5766                        },
5767                        // Reinsert the remainder of the file between the semicolon and the final
5768                        // newline of the file.
5769                        lsp::TextEdit {
5770                            range: lsp::Range::new(
5771                                lsp::Position::new(0, 9),
5772                                lsp::Position::new(0, 9),
5773                            ),
5774                            new_text: "\n\n".into(),
5775                        },
5776                        lsp::TextEdit {
5777                            range: lsp::Range::new(
5778                                lsp::Position::new(0, 9),
5779                                lsp::Position::new(0, 9),
5780                            ),
5781                            new_text: "
5782                                fn f() {
5783                                    b();
5784                                    c();
5785                                }"
5786                            .unindent(),
5787                        },
5788                        // Delete everything after the first newline of the file.
5789                        lsp::TextEdit {
5790                            range: lsp::Range::new(
5791                                lsp::Position::new(1, 0),
5792                                lsp::Position::new(7, 0),
5793                            ),
5794                            new_text: "".into(),
5795                        },
5796                    ],
5797                    None,
5798                    cx,
5799                )
5800            })
5801            .await
5802            .unwrap();
5803
5804        buffer.update(cx, |buffer, cx| {
5805            let edits = edits
5806                .into_iter()
5807                .map(|(range, text)| {
5808                    (
5809                        range.start.to_point(&buffer)..range.end.to_point(&buffer),
5810                        text,
5811                    )
5812                })
5813                .collect::<Vec<_>>();
5814
5815            assert_eq!(
5816                edits,
5817                [
5818                    (Point::new(0, 4)..Point::new(0, 8), "a::{b, c}".into()),
5819                    (Point::new(1, 0)..Point::new(2, 0), "".into())
5820                ]
5821            );
5822
5823            for (range, new_text) in edits {
5824                buffer.edit([range], new_text, cx);
5825            }
5826            assert_eq!(
5827                buffer.text(),
5828                "
5829                    use a::{b, c};
5830
5831                    fn f() {
5832                        b();
5833                        c();
5834                    }
5835                "
5836                .unindent()
5837            );
5838        });
5839    }
5840
5841    fn chunks_with_diagnostics<T: ToOffset + ToPoint>(
5842        buffer: &Buffer,
5843        range: Range<T>,
5844    ) -> Vec<(String, Option<DiagnosticSeverity>)> {
5845        let mut chunks: Vec<(String, Option<DiagnosticSeverity>)> = Vec::new();
5846        for chunk in buffer.snapshot().chunks(range, true) {
5847            if chunks.last().map_or(false, |prev_chunk| {
5848                prev_chunk.1 == chunk.diagnostic_severity
5849            }) {
5850                chunks.last_mut().unwrap().0.push_str(chunk.text);
5851            } else {
5852                chunks.push((chunk.text.to_string(), chunk.diagnostic_severity));
5853            }
5854        }
5855        chunks
5856    }
5857
5858    #[gpui::test]
5859    async fn test_search_worktree_without_files(cx: &mut gpui::TestAppContext) {
5860        let dir = temp_tree(json!({
5861            "root": {
5862                "dir1": {},
5863                "dir2": {
5864                    "dir3": {}
5865                }
5866            }
5867        }));
5868
5869        let project = Project::test(Arc::new(RealFs), cx);
5870        let (tree, _) = project
5871            .update(cx, |project, cx| {
5872                project.find_or_create_local_worktree(&dir.path(), true, cx)
5873            })
5874            .await
5875            .unwrap();
5876
5877        cx.read(|cx| tree.read(cx).as_local().unwrap().scan_complete())
5878            .await;
5879
5880        let cancel_flag = Default::default();
5881        let results = project
5882            .read_with(cx, |project, cx| {
5883                project.match_paths("dir", false, false, 10, &cancel_flag, cx)
5884            })
5885            .await;
5886
5887        assert!(results.is_empty());
5888    }
5889
5890    #[gpui::test]
5891    async fn test_definition(cx: &mut gpui::TestAppContext) {
5892        let mut language = Language::new(
5893            LanguageConfig {
5894                name: "Rust".into(),
5895                path_suffixes: vec!["rs".to_string()],
5896                ..Default::default()
5897            },
5898            Some(tree_sitter_rust::language()),
5899        );
5900        let mut fake_servers = language.set_fake_lsp_adapter(Default::default());
5901
5902        let fs = FakeFs::new(cx.background());
5903        fs.insert_tree(
5904            "/dir",
5905            json!({
5906                "a.rs": "const fn a() { A }",
5907                "b.rs": "const y: i32 = crate::a()",
5908            }),
5909        )
5910        .await;
5911
5912        let project = Project::test(fs, cx);
5913        project.update(cx, |project, _| project.languages.add(Arc::new(language)));
5914
5915        let (tree, _) = project
5916            .update(cx, |project, cx| {
5917                project.find_or_create_local_worktree("/dir/b.rs", true, cx)
5918            })
5919            .await
5920            .unwrap();
5921        let worktree_id = tree.read_with(cx, |tree, _| tree.id());
5922        cx.read(|cx| tree.read(cx).as_local().unwrap().scan_complete())
5923            .await;
5924
5925        let buffer = project
5926            .update(cx, |project, cx| project.open_buffer((worktree_id, ""), cx))
5927            .await
5928            .unwrap();
5929
5930        let fake_server = fake_servers.next().await.unwrap();
5931        fake_server.handle_request::<lsp::request::GotoDefinition, _, _>(|params, _| async move {
5932            let params = params.text_document_position_params;
5933            assert_eq!(
5934                params.text_document.uri.to_file_path().unwrap(),
5935                Path::new("/dir/b.rs"),
5936            );
5937            assert_eq!(params.position, lsp::Position::new(0, 22));
5938
5939            Ok(Some(lsp::GotoDefinitionResponse::Scalar(
5940                lsp::Location::new(
5941                    lsp::Url::from_file_path("/dir/a.rs").unwrap(),
5942                    lsp::Range::new(lsp::Position::new(0, 9), lsp::Position::new(0, 10)),
5943                ),
5944            )))
5945        });
5946
5947        let mut definitions = project
5948            .update(cx, |project, cx| project.definition(&buffer, 22, cx))
5949            .await
5950            .unwrap();
5951
5952        assert_eq!(definitions.len(), 1);
5953        let definition = definitions.pop().unwrap();
5954        cx.update(|cx| {
5955            let target_buffer = definition.buffer.read(cx);
5956            assert_eq!(
5957                target_buffer
5958                    .file()
5959                    .unwrap()
5960                    .as_local()
5961                    .unwrap()
5962                    .abs_path(cx),
5963                Path::new("/dir/a.rs"),
5964            );
5965            assert_eq!(definition.range.to_offset(target_buffer), 9..10);
5966            assert_eq!(
5967                list_worktrees(&project, cx),
5968                [("/dir/b.rs".as_ref(), true), ("/dir/a.rs".as_ref(), false)]
5969            );
5970
5971            drop(definition);
5972        });
5973        cx.read(|cx| {
5974            assert_eq!(list_worktrees(&project, cx), [("/dir/b.rs".as_ref(), true)]);
5975        });
5976
5977        fn list_worktrees<'a>(
5978            project: &'a ModelHandle<Project>,
5979            cx: &'a AppContext,
5980        ) -> Vec<(&'a Path, bool)> {
5981            project
5982                .read(cx)
5983                .worktrees(cx)
5984                .map(|worktree| {
5985                    let worktree = worktree.read(cx);
5986                    (
5987                        worktree.as_local().unwrap().abs_path().as_ref(),
5988                        worktree.is_visible(),
5989                    )
5990                })
5991                .collect::<Vec<_>>()
5992        }
5993    }
5994
5995    #[gpui::test]
5996    async fn test_save_file(cx: &mut gpui::TestAppContext) {
5997        let fs = FakeFs::new(cx.background());
5998        fs.insert_tree(
5999            "/dir",
6000            json!({
6001                "file1": "the old contents",
6002            }),
6003        )
6004        .await;
6005
6006        let project = Project::test(fs.clone(), cx);
6007        let worktree_id = project
6008            .update(cx, |p, cx| {
6009                p.find_or_create_local_worktree("/dir", true, cx)
6010            })
6011            .await
6012            .unwrap()
6013            .0
6014            .read_with(cx, |tree, _| tree.id());
6015
6016        let buffer = project
6017            .update(cx, |p, cx| p.open_buffer((worktree_id, "file1"), cx))
6018            .await
6019            .unwrap();
6020        buffer
6021            .update(cx, |buffer, cx| {
6022                assert_eq!(buffer.text(), "the old contents");
6023                buffer.edit(Some(0..0), "a line of text.\n".repeat(10 * 1024), cx);
6024                buffer.save(cx)
6025            })
6026            .await
6027            .unwrap();
6028
6029        let new_text = fs.load(Path::new("/dir/file1")).await.unwrap();
6030        assert_eq!(new_text, buffer.read_with(cx, |buffer, _| buffer.text()));
6031    }
6032
6033    #[gpui::test]
6034    async fn test_save_in_single_file_worktree(cx: &mut gpui::TestAppContext) {
6035        let fs = FakeFs::new(cx.background());
6036        fs.insert_tree(
6037            "/dir",
6038            json!({
6039                "file1": "the old contents",
6040            }),
6041        )
6042        .await;
6043
6044        let project = Project::test(fs.clone(), cx);
6045        let worktree_id = project
6046            .update(cx, |p, cx| {
6047                p.find_or_create_local_worktree("/dir/file1", true, cx)
6048            })
6049            .await
6050            .unwrap()
6051            .0
6052            .read_with(cx, |tree, _| tree.id());
6053
6054        let buffer = project
6055            .update(cx, |p, cx| p.open_buffer((worktree_id, ""), cx))
6056            .await
6057            .unwrap();
6058        buffer
6059            .update(cx, |buffer, cx| {
6060                buffer.edit(Some(0..0), "a line of text.\n".repeat(10 * 1024), cx);
6061                buffer.save(cx)
6062            })
6063            .await
6064            .unwrap();
6065
6066        let new_text = fs.load(Path::new("/dir/file1")).await.unwrap();
6067        assert_eq!(new_text, buffer.read_with(cx, |buffer, _| buffer.text()));
6068    }
6069
6070    #[gpui::test]
6071    async fn test_save_as(cx: &mut gpui::TestAppContext) {
6072        let fs = FakeFs::new(cx.background());
6073        fs.insert_tree("/dir", json!({})).await;
6074
6075        let project = Project::test(fs.clone(), cx);
6076        let (worktree, _) = project
6077            .update(cx, |project, cx| {
6078                project.find_or_create_local_worktree("/dir", true, cx)
6079            })
6080            .await
6081            .unwrap();
6082        let worktree_id = worktree.read_with(cx, |worktree, _| worktree.id());
6083
6084        let buffer = project.update(cx, |project, cx| project.create_buffer(cx).unwrap());
6085        buffer.update(cx, |buffer, cx| {
6086            buffer.edit([0..0], "abc", cx);
6087            assert!(buffer.is_dirty());
6088            assert!(!buffer.has_conflict());
6089        });
6090        project
6091            .update(cx, |project, cx| {
6092                project.save_buffer_as(buffer.clone(), "/dir/file1".into(), cx)
6093            })
6094            .await
6095            .unwrap();
6096        assert_eq!(fs.load(Path::new("/dir/file1")).await.unwrap(), "abc");
6097        buffer.read_with(cx, |buffer, cx| {
6098            assert_eq!(buffer.file().unwrap().full_path(cx), Path::new("dir/file1"));
6099            assert!(!buffer.is_dirty());
6100            assert!(!buffer.has_conflict());
6101        });
6102
6103        let opened_buffer = project
6104            .update(cx, |project, cx| {
6105                project.open_buffer((worktree_id, "file1"), cx)
6106            })
6107            .await
6108            .unwrap();
6109        assert_eq!(opened_buffer, buffer);
6110    }
6111
6112    #[gpui::test(retries = 5)]
6113    async fn test_rescan_and_remote_updates(cx: &mut gpui::TestAppContext) {
6114        let dir = temp_tree(json!({
6115            "a": {
6116                "file1": "",
6117                "file2": "",
6118                "file3": "",
6119            },
6120            "b": {
6121                "c": {
6122                    "file4": "",
6123                    "file5": "",
6124                }
6125            }
6126        }));
6127
6128        let project = Project::test(Arc::new(RealFs), cx);
6129        let rpc = project.read_with(cx, |p, _| p.client.clone());
6130
6131        let (tree, _) = project
6132            .update(cx, |p, cx| {
6133                p.find_or_create_local_worktree(dir.path(), true, cx)
6134            })
6135            .await
6136            .unwrap();
6137        let worktree_id = tree.read_with(cx, |tree, _| tree.id());
6138
6139        let buffer_for_path = |path: &'static str, cx: &mut gpui::TestAppContext| {
6140            let buffer = project.update(cx, |p, cx| p.open_buffer((worktree_id, path), cx));
6141            async move { buffer.await.unwrap() }
6142        };
6143        let id_for_path = |path: &'static str, cx: &gpui::TestAppContext| {
6144            tree.read_with(cx, |tree, _| {
6145                tree.entry_for_path(path)
6146                    .expect(&format!("no entry for path {}", path))
6147                    .id
6148            })
6149        };
6150
6151        let buffer2 = buffer_for_path("a/file2", cx).await;
6152        let buffer3 = buffer_for_path("a/file3", cx).await;
6153        let buffer4 = buffer_for_path("b/c/file4", cx).await;
6154        let buffer5 = buffer_for_path("b/c/file5", cx).await;
6155
6156        let file2_id = id_for_path("a/file2", &cx);
6157        let file3_id = id_for_path("a/file3", &cx);
6158        let file4_id = id_for_path("b/c/file4", &cx);
6159
6160        // Wait for the initial scan.
6161        cx.read(|cx| tree.read(cx).as_local().unwrap().scan_complete())
6162            .await;
6163
6164        // Create a remote copy of this worktree.
6165        let initial_snapshot = tree.read_with(cx, |tree, _| tree.as_local().unwrap().snapshot());
6166        let (remote, load_task) = cx.update(|cx| {
6167            Worktree::remote(
6168                1,
6169                1,
6170                initial_snapshot.to_proto(&Default::default(), true),
6171                rpc.clone(),
6172                cx,
6173            )
6174        });
6175        load_task.await;
6176
6177        cx.read(|cx| {
6178            assert!(!buffer2.read(cx).is_dirty());
6179            assert!(!buffer3.read(cx).is_dirty());
6180            assert!(!buffer4.read(cx).is_dirty());
6181            assert!(!buffer5.read(cx).is_dirty());
6182        });
6183
6184        // Rename and delete files and directories.
6185        tree.flush_fs_events(&cx).await;
6186        std::fs::rename(dir.path().join("a/file3"), dir.path().join("b/c/file3")).unwrap();
6187        std::fs::remove_file(dir.path().join("b/c/file5")).unwrap();
6188        std::fs::rename(dir.path().join("b/c"), dir.path().join("d")).unwrap();
6189        std::fs::rename(dir.path().join("a/file2"), dir.path().join("a/file2.new")).unwrap();
6190        tree.flush_fs_events(&cx).await;
6191
6192        let expected_paths = vec![
6193            "a",
6194            "a/file1",
6195            "a/file2.new",
6196            "b",
6197            "d",
6198            "d/file3",
6199            "d/file4",
6200        ];
6201
6202        cx.read(|app| {
6203            assert_eq!(
6204                tree.read(app)
6205                    .paths()
6206                    .map(|p| p.to_str().unwrap())
6207                    .collect::<Vec<_>>(),
6208                expected_paths
6209            );
6210
6211            assert_eq!(id_for_path("a/file2.new", &cx), file2_id);
6212            assert_eq!(id_for_path("d/file3", &cx), file3_id);
6213            assert_eq!(id_for_path("d/file4", &cx), file4_id);
6214
6215            assert_eq!(
6216                buffer2.read(app).file().unwrap().path().as_ref(),
6217                Path::new("a/file2.new")
6218            );
6219            assert_eq!(
6220                buffer3.read(app).file().unwrap().path().as_ref(),
6221                Path::new("d/file3")
6222            );
6223            assert_eq!(
6224                buffer4.read(app).file().unwrap().path().as_ref(),
6225                Path::new("d/file4")
6226            );
6227            assert_eq!(
6228                buffer5.read(app).file().unwrap().path().as_ref(),
6229                Path::new("b/c/file5")
6230            );
6231
6232            assert!(!buffer2.read(app).file().unwrap().is_deleted());
6233            assert!(!buffer3.read(app).file().unwrap().is_deleted());
6234            assert!(!buffer4.read(app).file().unwrap().is_deleted());
6235            assert!(buffer5.read(app).file().unwrap().is_deleted());
6236        });
6237
6238        // Update the remote worktree. Check that it becomes consistent with the
6239        // local worktree.
6240        remote.update(cx, |remote, cx| {
6241            let update_message = tree.read(cx).as_local().unwrap().snapshot().build_update(
6242                &initial_snapshot,
6243                1,
6244                1,
6245                true,
6246            );
6247            remote
6248                .as_remote_mut()
6249                .unwrap()
6250                .snapshot
6251                .apply_remote_update(update_message)
6252                .unwrap();
6253
6254            assert_eq!(
6255                remote
6256                    .paths()
6257                    .map(|p| p.to_str().unwrap())
6258                    .collect::<Vec<_>>(),
6259                expected_paths
6260            );
6261        });
6262    }
6263
6264    #[gpui::test]
6265    async fn test_buffer_deduping(cx: &mut gpui::TestAppContext) {
6266        let fs = FakeFs::new(cx.background());
6267        fs.insert_tree(
6268            "/the-dir",
6269            json!({
6270                "a.txt": "a-contents",
6271                "b.txt": "b-contents",
6272            }),
6273        )
6274        .await;
6275
6276        let project = Project::test(fs.clone(), cx);
6277        let worktree_id = project
6278            .update(cx, |p, cx| {
6279                p.find_or_create_local_worktree("/the-dir", true, cx)
6280            })
6281            .await
6282            .unwrap()
6283            .0
6284            .read_with(cx, |tree, _| tree.id());
6285
6286        // Spawn multiple tasks to open paths, repeating some paths.
6287        let (buffer_a_1, buffer_b, buffer_a_2) = project.update(cx, |p, cx| {
6288            (
6289                p.open_buffer((worktree_id, "a.txt"), cx),
6290                p.open_buffer((worktree_id, "b.txt"), cx),
6291                p.open_buffer((worktree_id, "a.txt"), cx),
6292            )
6293        });
6294
6295        let buffer_a_1 = buffer_a_1.await.unwrap();
6296        let buffer_a_2 = buffer_a_2.await.unwrap();
6297        let buffer_b = buffer_b.await.unwrap();
6298        assert_eq!(buffer_a_1.read_with(cx, |b, _| b.text()), "a-contents");
6299        assert_eq!(buffer_b.read_with(cx, |b, _| b.text()), "b-contents");
6300
6301        // There is only one buffer per path.
6302        let buffer_a_id = buffer_a_1.id();
6303        assert_eq!(buffer_a_2.id(), buffer_a_id);
6304
6305        // Open the same path again while it is still open.
6306        drop(buffer_a_1);
6307        let buffer_a_3 = project
6308            .update(cx, |p, cx| p.open_buffer((worktree_id, "a.txt"), cx))
6309            .await
6310            .unwrap();
6311
6312        // There's still only one buffer per path.
6313        assert_eq!(buffer_a_3.id(), buffer_a_id);
6314    }
6315
6316    #[gpui::test]
6317    async fn test_buffer_is_dirty(cx: &mut gpui::TestAppContext) {
6318        use std::fs;
6319
6320        let dir = temp_tree(json!({
6321            "file1": "abc",
6322            "file2": "def",
6323            "file3": "ghi",
6324        }));
6325
6326        let project = Project::test(Arc::new(RealFs), cx);
6327        let (worktree, _) = project
6328            .update(cx, |p, cx| {
6329                p.find_or_create_local_worktree(dir.path(), true, cx)
6330            })
6331            .await
6332            .unwrap();
6333        let worktree_id = worktree.read_with(cx, |worktree, _| worktree.id());
6334
6335        worktree.flush_fs_events(&cx).await;
6336        worktree
6337            .read_with(cx, |t, _| t.as_local().unwrap().scan_complete())
6338            .await;
6339
6340        let buffer1 = project
6341            .update(cx, |p, cx| p.open_buffer((worktree_id, "file1"), cx))
6342            .await
6343            .unwrap();
6344        let events = Rc::new(RefCell::new(Vec::new()));
6345
6346        // initially, the buffer isn't dirty.
6347        buffer1.update(cx, |buffer, cx| {
6348            cx.subscribe(&buffer1, {
6349                let events = events.clone();
6350                move |_, _, event, _| match event {
6351                    BufferEvent::Operation(_) => {}
6352                    _ => events.borrow_mut().push(event.clone()),
6353                }
6354            })
6355            .detach();
6356
6357            assert!(!buffer.is_dirty());
6358            assert!(events.borrow().is_empty());
6359
6360            buffer.edit(vec![1..2], "", cx);
6361        });
6362
6363        // after the first edit, the buffer is dirty, and emits a dirtied event.
6364        buffer1.update(cx, |buffer, cx| {
6365            assert!(buffer.text() == "ac");
6366            assert!(buffer.is_dirty());
6367            assert_eq!(
6368                *events.borrow(),
6369                &[language::Event::Edited, language::Event::Dirtied]
6370            );
6371            events.borrow_mut().clear();
6372            buffer.did_save(buffer.version(), buffer.file().unwrap().mtime(), None, cx);
6373        });
6374
6375        // after saving, the buffer is not dirty, and emits a saved event.
6376        buffer1.update(cx, |buffer, cx| {
6377            assert!(!buffer.is_dirty());
6378            assert_eq!(*events.borrow(), &[language::Event::Saved]);
6379            events.borrow_mut().clear();
6380
6381            buffer.edit(vec![1..1], "B", cx);
6382            buffer.edit(vec![2..2], "D", cx);
6383        });
6384
6385        // after editing again, the buffer is dirty, and emits another dirty event.
6386        buffer1.update(cx, |buffer, cx| {
6387            assert!(buffer.text() == "aBDc");
6388            assert!(buffer.is_dirty());
6389            assert_eq!(
6390                *events.borrow(),
6391                &[
6392                    language::Event::Edited,
6393                    language::Event::Dirtied,
6394                    language::Event::Edited,
6395                ],
6396            );
6397            events.borrow_mut().clear();
6398
6399            // TODO - currently, after restoring the buffer to its
6400            // previously-saved state, the is still considered dirty.
6401            buffer.edit([1..3], "", cx);
6402            assert!(buffer.text() == "ac");
6403            assert!(buffer.is_dirty());
6404        });
6405
6406        assert_eq!(*events.borrow(), &[language::Event::Edited]);
6407
6408        // When a file is deleted, the buffer is considered dirty.
6409        let events = Rc::new(RefCell::new(Vec::new()));
6410        let buffer2 = project
6411            .update(cx, |p, cx| p.open_buffer((worktree_id, "file2"), cx))
6412            .await
6413            .unwrap();
6414        buffer2.update(cx, |_, cx| {
6415            cx.subscribe(&buffer2, {
6416                let events = events.clone();
6417                move |_, _, event, _| events.borrow_mut().push(event.clone())
6418            })
6419            .detach();
6420        });
6421
6422        fs::remove_file(dir.path().join("file2")).unwrap();
6423        buffer2.condition(&cx, |b, _| b.is_dirty()).await;
6424        assert_eq!(
6425            *events.borrow(),
6426            &[language::Event::Dirtied, language::Event::FileHandleChanged]
6427        );
6428
6429        // When a file is already dirty when deleted, we don't emit a Dirtied event.
6430        let events = Rc::new(RefCell::new(Vec::new()));
6431        let buffer3 = project
6432            .update(cx, |p, cx| p.open_buffer((worktree_id, "file3"), cx))
6433            .await
6434            .unwrap();
6435        buffer3.update(cx, |_, cx| {
6436            cx.subscribe(&buffer3, {
6437                let events = events.clone();
6438                move |_, _, event, _| events.borrow_mut().push(event.clone())
6439            })
6440            .detach();
6441        });
6442
6443        worktree.flush_fs_events(&cx).await;
6444        buffer3.update(cx, |buffer, cx| {
6445            buffer.edit(Some(0..0), "x", cx);
6446        });
6447        events.borrow_mut().clear();
6448        fs::remove_file(dir.path().join("file3")).unwrap();
6449        buffer3
6450            .condition(&cx, |_, _| !events.borrow().is_empty())
6451            .await;
6452        assert_eq!(*events.borrow(), &[language::Event::FileHandleChanged]);
6453        cx.read(|cx| assert!(buffer3.read(cx).is_dirty()));
6454    }
6455
6456    #[gpui::test]
6457    async fn test_buffer_file_changes_on_disk(cx: &mut gpui::TestAppContext) {
6458        use std::fs;
6459
6460        let initial_contents = "aaa\nbbbbb\nc\n";
6461        let dir = temp_tree(json!({ "the-file": initial_contents }));
6462
6463        let project = Project::test(Arc::new(RealFs), cx);
6464        let (worktree, _) = project
6465            .update(cx, |p, cx| {
6466                p.find_or_create_local_worktree(dir.path(), true, cx)
6467            })
6468            .await
6469            .unwrap();
6470        let worktree_id = worktree.read_with(cx, |tree, _| tree.id());
6471
6472        worktree
6473            .read_with(cx, |t, _| t.as_local().unwrap().scan_complete())
6474            .await;
6475
6476        let abs_path = dir.path().join("the-file");
6477        let buffer = project
6478            .update(cx, |p, cx| p.open_buffer((worktree_id, "the-file"), cx))
6479            .await
6480            .unwrap();
6481
6482        // TODO
6483        // Add a cursor on each row.
6484        // let selection_set_id = buffer.update(&mut cx, |buffer, cx| {
6485        //     assert!(!buffer.is_dirty());
6486        //     buffer.add_selection_set(
6487        //         &(0..3)
6488        //             .map(|row| Selection {
6489        //                 id: row as usize,
6490        //                 start: Point::new(row, 1),
6491        //                 end: Point::new(row, 1),
6492        //                 reversed: false,
6493        //                 goal: SelectionGoal::None,
6494        //             })
6495        //             .collect::<Vec<_>>(),
6496        //         cx,
6497        //     )
6498        // });
6499
6500        // Change the file on disk, adding two new lines of text, and removing
6501        // one line.
6502        buffer.read_with(cx, |buffer, _| {
6503            assert!(!buffer.is_dirty());
6504            assert!(!buffer.has_conflict());
6505        });
6506        let new_contents = "AAAA\naaa\nBB\nbbbbb\n";
6507        fs::write(&abs_path, new_contents).unwrap();
6508
6509        // Because the buffer was not modified, it is reloaded from disk. Its
6510        // contents are edited according to the diff between the old and new
6511        // file contents.
6512        buffer
6513            .condition(&cx, |buffer, _| buffer.text() == new_contents)
6514            .await;
6515
6516        buffer.update(cx, |buffer, _| {
6517            assert_eq!(buffer.text(), new_contents);
6518            assert!(!buffer.is_dirty());
6519            assert!(!buffer.has_conflict());
6520
6521            // TODO
6522            // let cursor_positions = buffer
6523            //     .selection_set(selection_set_id)
6524            //     .unwrap()
6525            //     .selections::<Point>(&*buffer)
6526            //     .map(|selection| {
6527            //         assert_eq!(selection.start, selection.end);
6528            //         selection.start
6529            //     })
6530            //     .collect::<Vec<_>>();
6531            // assert_eq!(
6532            //     cursor_positions,
6533            //     [Point::new(1, 1), Point::new(3, 1), Point::new(4, 0)]
6534            // );
6535        });
6536
6537        // Modify the buffer
6538        buffer.update(cx, |buffer, cx| {
6539            buffer.edit(vec![0..0], " ", cx);
6540            assert!(buffer.is_dirty());
6541            assert!(!buffer.has_conflict());
6542        });
6543
6544        // Change the file on disk again, adding blank lines to the beginning.
6545        fs::write(&abs_path, "\n\n\nAAAA\naaa\nBB\nbbbbb\n").unwrap();
6546
6547        // Because the buffer is modified, it doesn't reload from disk, but is
6548        // marked as having a conflict.
6549        buffer
6550            .condition(&cx, |buffer, _| buffer.has_conflict())
6551            .await;
6552    }
6553
6554    #[gpui::test]
6555    async fn test_grouped_diagnostics(cx: &mut gpui::TestAppContext) {
6556        cx.foreground().forbid_parking();
6557
6558        let fs = FakeFs::new(cx.background());
6559        fs.insert_tree(
6560            "/the-dir",
6561            json!({
6562                "a.rs": "
6563                    fn foo(mut v: Vec<usize>) {
6564                        for x in &v {
6565                            v.push(1);
6566                        }
6567                    }
6568                "
6569                .unindent(),
6570            }),
6571        )
6572        .await;
6573
6574        let project = Project::test(fs.clone(), cx);
6575        let (worktree, _) = project
6576            .update(cx, |p, cx| {
6577                p.find_or_create_local_worktree("/the-dir", true, cx)
6578            })
6579            .await
6580            .unwrap();
6581        let worktree_id = worktree.read_with(cx, |tree, _| tree.id());
6582
6583        let buffer = project
6584            .update(cx, |p, cx| p.open_buffer((worktree_id, "a.rs"), cx))
6585            .await
6586            .unwrap();
6587
6588        let buffer_uri = Url::from_file_path("/the-dir/a.rs").unwrap();
6589        let message = lsp::PublishDiagnosticsParams {
6590            uri: buffer_uri.clone(),
6591            diagnostics: vec![
6592                lsp::Diagnostic {
6593                    range: lsp::Range::new(lsp::Position::new(1, 8), lsp::Position::new(1, 9)),
6594                    severity: Some(DiagnosticSeverity::WARNING),
6595                    message: "error 1".to_string(),
6596                    related_information: Some(vec![lsp::DiagnosticRelatedInformation {
6597                        location: lsp::Location {
6598                            uri: buffer_uri.clone(),
6599                            range: lsp::Range::new(
6600                                lsp::Position::new(1, 8),
6601                                lsp::Position::new(1, 9),
6602                            ),
6603                        },
6604                        message: "error 1 hint 1".to_string(),
6605                    }]),
6606                    ..Default::default()
6607                },
6608                lsp::Diagnostic {
6609                    range: lsp::Range::new(lsp::Position::new(1, 8), lsp::Position::new(1, 9)),
6610                    severity: Some(DiagnosticSeverity::HINT),
6611                    message: "error 1 hint 1".to_string(),
6612                    related_information: Some(vec![lsp::DiagnosticRelatedInformation {
6613                        location: lsp::Location {
6614                            uri: buffer_uri.clone(),
6615                            range: lsp::Range::new(
6616                                lsp::Position::new(1, 8),
6617                                lsp::Position::new(1, 9),
6618                            ),
6619                        },
6620                        message: "original diagnostic".to_string(),
6621                    }]),
6622                    ..Default::default()
6623                },
6624                lsp::Diagnostic {
6625                    range: lsp::Range::new(lsp::Position::new(2, 8), lsp::Position::new(2, 17)),
6626                    severity: Some(DiagnosticSeverity::ERROR),
6627                    message: "error 2".to_string(),
6628                    related_information: Some(vec![
6629                        lsp::DiagnosticRelatedInformation {
6630                            location: lsp::Location {
6631                                uri: buffer_uri.clone(),
6632                                range: lsp::Range::new(
6633                                    lsp::Position::new(1, 13),
6634                                    lsp::Position::new(1, 15),
6635                                ),
6636                            },
6637                            message: "error 2 hint 1".to_string(),
6638                        },
6639                        lsp::DiagnosticRelatedInformation {
6640                            location: lsp::Location {
6641                                uri: buffer_uri.clone(),
6642                                range: lsp::Range::new(
6643                                    lsp::Position::new(1, 13),
6644                                    lsp::Position::new(1, 15),
6645                                ),
6646                            },
6647                            message: "error 2 hint 2".to_string(),
6648                        },
6649                    ]),
6650                    ..Default::default()
6651                },
6652                lsp::Diagnostic {
6653                    range: lsp::Range::new(lsp::Position::new(1, 13), lsp::Position::new(1, 15)),
6654                    severity: Some(DiagnosticSeverity::HINT),
6655                    message: "error 2 hint 1".to_string(),
6656                    related_information: Some(vec![lsp::DiagnosticRelatedInformation {
6657                        location: lsp::Location {
6658                            uri: buffer_uri.clone(),
6659                            range: lsp::Range::new(
6660                                lsp::Position::new(2, 8),
6661                                lsp::Position::new(2, 17),
6662                            ),
6663                        },
6664                        message: "original diagnostic".to_string(),
6665                    }]),
6666                    ..Default::default()
6667                },
6668                lsp::Diagnostic {
6669                    range: lsp::Range::new(lsp::Position::new(1, 13), lsp::Position::new(1, 15)),
6670                    severity: Some(DiagnosticSeverity::HINT),
6671                    message: "error 2 hint 2".to_string(),
6672                    related_information: Some(vec![lsp::DiagnosticRelatedInformation {
6673                        location: lsp::Location {
6674                            uri: buffer_uri.clone(),
6675                            range: lsp::Range::new(
6676                                lsp::Position::new(2, 8),
6677                                lsp::Position::new(2, 17),
6678                            ),
6679                        },
6680                        message: "original diagnostic".to_string(),
6681                    }]),
6682                    ..Default::default()
6683                },
6684            ],
6685            version: None,
6686        };
6687
6688        project
6689            .update(cx, |p, cx| p.update_diagnostics(message, &[], cx))
6690            .unwrap();
6691        let buffer = buffer.read_with(cx, |buffer, _| buffer.snapshot());
6692
6693        assert_eq!(
6694            buffer
6695                .diagnostics_in_range::<_, Point>(0..buffer.len(), false)
6696                .collect::<Vec<_>>(),
6697            &[
6698                DiagnosticEntry {
6699                    range: Point::new(1, 8)..Point::new(1, 9),
6700                    diagnostic: Diagnostic {
6701                        severity: DiagnosticSeverity::WARNING,
6702                        message: "error 1".to_string(),
6703                        group_id: 0,
6704                        is_primary: true,
6705                        ..Default::default()
6706                    }
6707                },
6708                DiagnosticEntry {
6709                    range: Point::new(1, 8)..Point::new(1, 9),
6710                    diagnostic: Diagnostic {
6711                        severity: DiagnosticSeverity::HINT,
6712                        message: "error 1 hint 1".to_string(),
6713                        group_id: 0,
6714                        is_primary: false,
6715                        ..Default::default()
6716                    }
6717                },
6718                DiagnosticEntry {
6719                    range: Point::new(1, 13)..Point::new(1, 15),
6720                    diagnostic: Diagnostic {
6721                        severity: DiagnosticSeverity::HINT,
6722                        message: "error 2 hint 1".to_string(),
6723                        group_id: 1,
6724                        is_primary: false,
6725                        ..Default::default()
6726                    }
6727                },
6728                DiagnosticEntry {
6729                    range: Point::new(1, 13)..Point::new(1, 15),
6730                    diagnostic: Diagnostic {
6731                        severity: DiagnosticSeverity::HINT,
6732                        message: "error 2 hint 2".to_string(),
6733                        group_id: 1,
6734                        is_primary: false,
6735                        ..Default::default()
6736                    }
6737                },
6738                DiagnosticEntry {
6739                    range: Point::new(2, 8)..Point::new(2, 17),
6740                    diagnostic: Diagnostic {
6741                        severity: DiagnosticSeverity::ERROR,
6742                        message: "error 2".to_string(),
6743                        group_id: 1,
6744                        is_primary: true,
6745                        ..Default::default()
6746                    }
6747                }
6748            ]
6749        );
6750
6751        assert_eq!(
6752            buffer.diagnostic_group::<Point>(0).collect::<Vec<_>>(),
6753            &[
6754                DiagnosticEntry {
6755                    range: Point::new(1, 8)..Point::new(1, 9),
6756                    diagnostic: Diagnostic {
6757                        severity: DiagnosticSeverity::WARNING,
6758                        message: "error 1".to_string(),
6759                        group_id: 0,
6760                        is_primary: true,
6761                        ..Default::default()
6762                    }
6763                },
6764                DiagnosticEntry {
6765                    range: Point::new(1, 8)..Point::new(1, 9),
6766                    diagnostic: Diagnostic {
6767                        severity: DiagnosticSeverity::HINT,
6768                        message: "error 1 hint 1".to_string(),
6769                        group_id: 0,
6770                        is_primary: false,
6771                        ..Default::default()
6772                    }
6773                },
6774            ]
6775        );
6776        assert_eq!(
6777            buffer.diagnostic_group::<Point>(1).collect::<Vec<_>>(),
6778            &[
6779                DiagnosticEntry {
6780                    range: Point::new(1, 13)..Point::new(1, 15),
6781                    diagnostic: Diagnostic {
6782                        severity: DiagnosticSeverity::HINT,
6783                        message: "error 2 hint 1".to_string(),
6784                        group_id: 1,
6785                        is_primary: false,
6786                        ..Default::default()
6787                    }
6788                },
6789                DiagnosticEntry {
6790                    range: Point::new(1, 13)..Point::new(1, 15),
6791                    diagnostic: Diagnostic {
6792                        severity: DiagnosticSeverity::HINT,
6793                        message: "error 2 hint 2".to_string(),
6794                        group_id: 1,
6795                        is_primary: false,
6796                        ..Default::default()
6797                    }
6798                },
6799                DiagnosticEntry {
6800                    range: Point::new(2, 8)..Point::new(2, 17),
6801                    diagnostic: Diagnostic {
6802                        severity: DiagnosticSeverity::ERROR,
6803                        message: "error 2".to_string(),
6804                        group_id: 1,
6805                        is_primary: true,
6806                        ..Default::default()
6807                    }
6808                }
6809            ]
6810        );
6811    }
6812
6813    #[gpui::test]
6814    async fn test_rename(cx: &mut gpui::TestAppContext) {
6815        cx.foreground().forbid_parking();
6816
6817        let mut language = Language::new(
6818            LanguageConfig {
6819                name: "Rust".into(),
6820                path_suffixes: vec!["rs".to_string()],
6821                ..Default::default()
6822            },
6823            Some(tree_sitter_rust::language()),
6824        );
6825        let mut fake_servers = language.set_fake_lsp_adapter(Default::default());
6826
6827        let fs = FakeFs::new(cx.background());
6828        fs.insert_tree(
6829            "/dir",
6830            json!({
6831                "one.rs": "const ONE: usize = 1;",
6832                "two.rs": "const TWO: usize = one::ONE + one::ONE;"
6833            }),
6834        )
6835        .await;
6836
6837        let project = Project::test(fs.clone(), cx);
6838        project.update(cx, |project, _| project.languages.add(Arc::new(language)));
6839
6840        let (tree, _) = project
6841            .update(cx, |project, cx| {
6842                project.find_or_create_local_worktree("/dir", true, cx)
6843            })
6844            .await
6845            .unwrap();
6846        let worktree_id = tree.read_with(cx, |tree, _| tree.id());
6847        cx.read(|cx| tree.read(cx).as_local().unwrap().scan_complete())
6848            .await;
6849
6850        let buffer = project
6851            .update(cx, |project, cx| {
6852                project.open_buffer((worktree_id, Path::new("one.rs")), cx)
6853            })
6854            .await
6855            .unwrap();
6856
6857        let fake_server = fake_servers.next().await.unwrap();
6858
6859        let response = project.update(cx, |project, cx| {
6860            project.prepare_rename(buffer.clone(), 7, cx)
6861        });
6862        fake_server
6863            .handle_request::<lsp::request::PrepareRenameRequest, _, _>(|params, _| async move {
6864                assert_eq!(params.text_document.uri.as_str(), "file:///dir/one.rs");
6865                assert_eq!(params.position, lsp::Position::new(0, 7));
6866                Ok(Some(lsp::PrepareRenameResponse::Range(lsp::Range::new(
6867                    lsp::Position::new(0, 6),
6868                    lsp::Position::new(0, 9),
6869                ))))
6870            })
6871            .next()
6872            .await
6873            .unwrap();
6874        let range = response.await.unwrap().unwrap();
6875        let range = buffer.read_with(cx, |buffer, _| range.to_offset(buffer));
6876        assert_eq!(range, 6..9);
6877
6878        let response = project.update(cx, |project, cx| {
6879            project.perform_rename(buffer.clone(), 7, "THREE".to_string(), true, cx)
6880        });
6881        fake_server
6882            .handle_request::<lsp::request::Rename, _, _>(|params, _| async move {
6883                assert_eq!(
6884                    params.text_document_position.text_document.uri.as_str(),
6885                    "file:///dir/one.rs"
6886                );
6887                assert_eq!(
6888                    params.text_document_position.position,
6889                    lsp::Position::new(0, 7)
6890                );
6891                assert_eq!(params.new_name, "THREE");
6892                Ok(Some(lsp::WorkspaceEdit {
6893                    changes: Some(
6894                        [
6895                            (
6896                                lsp::Url::from_file_path("/dir/one.rs").unwrap(),
6897                                vec![lsp::TextEdit::new(
6898                                    lsp::Range::new(
6899                                        lsp::Position::new(0, 6),
6900                                        lsp::Position::new(0, 9),
6901                                    ),
6902                                    "THREE".to_string(),
6903                                )],
6904                            ),
6905                            (
6906                                lsp::Url::from_file_path("/dir/two.rs").unwrap(),
6907                                vec![
6908                                    lsp::TextEdit::new(
6909                                        lsp::Range::new(
6910                                            lsp::Position::new(0, 24),
6911                                            lsp::Position::new(0, 27),
6912                                        ),
6913                                        "THREE".to_string(),
6914                                    ),
6915                                    lsp::TextEdit::new(
6916                                        lsp::Range::new(
6917                                            lsp::Position::new(0, 35),
6918                                            lsp::Position::new(0, 38),
6919                                        ),
6920                                        "THREE".to_string(),
6921                                    ),
6922                                ],
6923                            ),
6924                        ]
6925                        .into_iter()
6926                        .collect(),
6927                    ),
6928                    ..Default::default()
6929                }))
6930            })
6931            .next()
6932            .await
6933            .unwrap();
6934        let mut transaction = response.await.unwrap().0;
6935        assert_eq!(transaction.len(), 2);
6936        assert_eq!(
6937            transaction
6938                .remove_entry(&buffer)
6939                .unwrap()
6940                .0
6941                .read_with(cx, |buffer, _| buffer.text()),
6942            "const THREE: usize = 1;"
6943        );
6944        assert_eq!(
6945            transaction
6946                .into_keys()
6947                .next()
6948                .unwrap()
6949                .read_with(cx, |buffer, _| buffer.text()),
6950            "const TWO: usize = one::THREE + one::THREE;"
6951        );
6952    }
6953
6954    #[gpui::test]
6955    async fn test_search(cx: &mut gpui::TestAppContext) {
6956        let fs = FakeFs::new(cx.background());
6957        fs.insert_tree(
6958            "/dir",
6959            json!({
6960                "one.rs": "const ONE: usize = 1;",
6961                "two.rs": "const TWO: usize = one::ONE + one::ONE;",
6962                "three.rs": "const THREE: usize = one::ONE + two::TWO;",
6963                "four.rs": "const FOUR: usize = one::ONE + three::THREE;",
6964            }),
6965        )
6966        .await;
6967        let project = Project::test(fs.clone(), cx);
6968        let (tree, _) = project
6969            .update(cx, |project, cx| {
6970                project.find_or_create_local_worktree("/dir", true, cx)
6971            })
6972            .await
6973            .unwrap();
6974        let worktree_id = tree.read_with(cx, |tree, _| tree.id());
6975        cx.read(|cx| tree.read(cx).as_local().unwrap().scan_complete())
6976            .await;
6977
6978        assert_eq!(
6979            search(&project, SearchQuery::text("TWO", false, true), cx)
6980                .await
6981                .unwrap(),
6982            HashMap::from_iter([
6983                ("two.rs".to_string(), vec![6..9]),
6984                ("three.rs".to_string(), vec![37..40])
6985            ])
6986        );
6987
6988        let buffer_4 = project
6989            .update(cx, |project, cx| {
6990                project.open_buffer((worktree_id, "four.rs"), cx)
6991            })
6992            .await
6993            .unwrap();
6994        buffer_4.update(cx, |buffer, cx| {
6995            buffer.edit([20..28, 31..43], "two::TWO", cx);
6996        });
6997
6998        assert_eq!(
6999            search(&project, SearchQuery::text("TWO", false, true), cx)
7000                .await
7001                .unwrap(),
7002            HashMap::from_iter([
7003                ("two.rs".to_string(), vec![6..9]),
7004                ("three.rs".to_string(), vec![37..40]),
7005                ("four.rs".to_string(), vec![25..28, 36..39])
7006            ])
7007        );
7008
7009        async fn search(
7010            project: &ModelHandle<Project>,
7011            query: SearchQuery,
7012            cx: &mut gpui::TestAppContext,
7013        ) -> Result<HashMap<String, Vec<Range<usize>>>> {
7014            let results = project
7015                .update(cx, |project, cx| project.search(query, cx))
7016                .await?;
7017
7018            Ok(results
7019                .into_iter()
7020                .map(|(buffer, ranges)| {
7021                    buffer.read_with(cx, |buffer, _| {
7022                        let path = buffer.file().unwrap().path().to_string_lossy().to_string();
7023                        let ranges = ranges
7024                            .into_iter()
7025                            .map(|range| range.to_offset(buffer))
7026                            .collect::<Vec<_>>();
7027                        (path, ranges)
7028                    })
7029                })
7030                .collect())
7031        }
7032    }
7033}