1pub mod fs;
   2mod ignore;
   3pub mod worktree;
   4
   5use anyhow::{anyhow, Result};
   6use client::{proto, Client, PeerId, TypedEnvelope, User, UserStore};
   7use clock::ReplicaId;
   8use collections::{hash_map, HashMap, HashSet};
   9use futures::Future;
  10use fuzzy::{PathMatch, PathMatchCandidate, PathMatchCandidateSet};
  11use gpui::{
  12    AppContext, AsyncAppContext, Entity, ModelContext, ModelHandle, MutableAppContext, Task,
  13    WeakModelHandle,
  14};
  15use language::{
  16    range_from_lsp, Bias, Buffer, Diagnostic, DiagnosticEntry, File as _, Language,
  17    LanguageRegistry, Operation, ToOffset, ToPointUtf16,
  18};
  19use lsp::{DiagnosticSeverity, LanguageServer};
  20use postage::{prelude::Stream, watch};
  21use smol::block_on;
  22use std::{
  23    convert::TryInto,
  24    ops::Range,
  25    path::{Path, PathBuf},
  26    sync::{
  27        atomic::{AtomicBool, Ordering::SeqCst},
  28        Arc,
  29    },
  30};
  31use util::{post_inc, ResultExt, TryFutureExt as _};
  32
  33pub use fs::*;
  34pub use worktree::*;
  35
  36pub struct Project {
  37    worktrees: Vec<WorktreeHandle>,
  38    active_entry: Option<ProjectEntry>,
  39    languages: Arc<LanguageRegistry>,
  40    language_servers: HashMap<(WorktreeId, String), Arc<LanguageServer>>,
  41    client: Arc<client::Client>,
  42    user_store: ModelHandle<UserStore>,
  43    fs: Arc<dyn Fs>,
  44    client_state: ProjectClientState,
  45    collaborators: HashMap<PeerId, Collaborator>,
  46    subscriptions: Vec<client::Subscription>,
  47    language_servers_with_diagnostics_running: isize,
  48    open_buffers: HashMap<usize, OpenBuffer>,
  49    loading_buffers: HashMap<
  50        ProjectPath,
  51        postage::watch::Receiver<
  52            Option<Result<(ModelHandle<Buffer>, Arc<AtomicBool>), Arc<anyhow::Error>>>,
  53        >,
  54    >,
  55    shared_buffers: HashMap<PeerId, HashMap<u64, ModelHandle<Buffer>>>,
  56}
  57
  58enum OpenBuffer {
  59    Operations(Vec<Operation>),
  60    Loaded(WeakModelHandle<Buffer>),
  61}
  62
  63enum WorktreeHandle {
  64    Strong(ModelHandle<Worktree>),
  65    Weak(WeakModelHandle<Worktree>),
  66}
  67
  68enum ProjectClientState {
  69    Local {
  70        is_shared: bool,
  71        remote_id_tx: watch::Sender<Option<u64>>,
  72        remote_id_rx: watch::Receiver<Option<u64>>,
  73        _maintain_remote_id_task: Task<Option<()>>,
  74    },
  75    Remote {
  76        sharing_has_stopped: bool,
  77        remote_id: u64,
  78        replica_id: ReplicaId,
  79    },
  80}
  81
  82#[derive(Clone, Debug)]
  83pub struct Collaborator {
  84    pub user: Arc<User>,
  85    pub peer_id: PeerId,
  86    pub replica_id: ReplicaId,
  87}
  88
  89#[derive(Clone, Debug, PartialEq)]
  90pub enum Event {
  91    ActiveEntryChanged(Option<ProjectEntry>),
  92    WorktreeRemoved(WorktreeId),
  93    DiskBasedDiagnosticsStarted,
  94    DiskBasedDiagnosticsUpdated,
  95    DiskBasedDiagnosticsFinished,
  96    DiagnosticsUpdated(ProjectPath),
  97}
  98
  99#[derive(Clone, Debug, Eq, PartialEq, Hash, PartialOrd, Ord)]
 100pub struct ProjectPath {
 101    pub worktree_id: WorktreeId,
 102    pub path: Arc<Path>,
 103}
 104
 105#[derive(Clone, Debug, Default, PartialEq)]
 106pub struct DiagnosticSummary {
 107    pub error_count: usize,
 108    pub warning_count: usize,
 109    pub info_count: usize,
 110    pub hint_count: usize,
 111}
 112
 113#[derive(Debug)]
 114pub struct Definition {
 115    pub target_buffer: ModelHandle<Buffer>,
 116    pub target_range: Range<language::Anchor>,
 117}
 118
 119impl DiagnosticSummary {
 120    fn new<'a, T: 'a>(diagnostics: impl IntoIterator<Item = &'a DiagnosticEntry<T>>) -> Self {
 121        let mut this = Self {
 122            error_count: 0,
 123            warning_count: 0,
 124            info_count: 0,
 125            hint_count: 0,
 126        };
 127
 128        for entry in diagnostics {
 129            if entry.diagnostic.is_primary {
 130                match entry.diagnostic.severity {
 131                    DiagnosticSeverity::ERROR => this.error_count += 1,
 132                    DiagnosticSeverity::WARNING => this.warning_count += 1,
 133                    DiagnosticSeverity::INFORMATION => this.info_count += 1,
 134                    DiagnosticSeverity::HINT => this.hint_count += 1,
 135                    _ => {}
 136                }
 137            }
 138        }
 139
 140        this
 141    }
 142
 143    pub fn to_proto(&self, path: Arc<Path>) -> proto::DiagnosticSummary {
 144        proto::DiagnosticSummary {
 145            path: path.to_string_lossy().to_string(),
 146            error_count: self.error_count as u32,
 147            warning_count: self.warning_count as u32,
 148            info_count: self.info_count as u32,
 149            hint_count: self.hint_count as u32,
 150        }
 151    }
 152}
 153
 154#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
 155pub struct ProjectEntry {
 156    pub worktree_id: WorktreeId,
 157    pub entry_id: usize,
 158}
 159
 160impl Project {
 161    pub fn local(
 162        client: Arc<Client>,
 163        user_store: ModelHandle<UserStore>,
 164        languages: Arc<LanguageRegistry>,
 165        fs: Arc<dyn Fs>,
 166        cx: &mut MutableAppContext,
 167    ) -> ModelHandle<Self> {
 168        cx.add_model(|cx: &mut ModelContext<Self>| {
 169            let (remote_id_tx, remote_id_rx) = watch::channel();
 170            let _maintain_remote_id_task = cx.spawn_weak({
 171                let rpc = client.clone();
 172                move |this, mut cx| {
 173                    async move {
 174                        let mut status = rpc.status();
 175                        while let Some(status) = status.recv().await {
 176                            if let Some(this) = this.upgrade(&cx) {
 177                                let remote_id = if let client::Status::Connected { .. } = status {
 178                                    let response = rpc.request(proto::RegisterProject {}).await?;
 179                                    Some(response.project_id)
 180                                } else {
 181                                    None
 182                                };
 183
 184                                if let Some(project_id) = remote_id {
 185                                    let mut registrations = Vec::new();
 186                                    this.update(&mut cx, |this, cx| {
 187                                        for worktree in this.worktrees(cx).collect::<Vec<_>>() {
 188                                            registrations.push(worktree.update(
 189                                                cx,
 190                                                |worktree, cx| {
 191                                                    let worktree = worktree.as_local_mut().unwrap();
 192                                                    worktree.register(project_id, cx)
 193                                                },
 194                                            ));
 195                                        }
 196                                    });
 197                                    for registration in registrations {
 198                                        registration.await?;
 199                                    }
 200                                }
 201                                this.update(&mut cx, |this, cx| this.set_remote_id(remote_id, cx));
 202                            }
 203                        }
 204                        Ok(())
 205                    }
 206                    .log_err()
 207                }
 208            });
 209
 210            Self {
 211                worktrees: Default::default(),
 212                collaborators: Default::default(),
 213                open_buffers: Default::default(),
 214                loading_buffers: Default::default(),
 215                shared_buffers: Default::default(),
 216                client_state: ProjectClientState::Local {
 217                    is_shared: false,
 218                    remote_id_tx,
 219                    remote_id_rx,
 220                    _maintain_remote_id_task,
 221                },
 222                subscriptions: Vec::new(),
 223                active_entry: None,
 224                languages,
 225                client,
 226                user_store,
 227                fs,
 228                language_servers_with_diagnostics_running: 0,
 229                language_servers: Default::default(),
 230            }
 231        })
 232    }
 233
 234    pub async fn remote(
 235        remote_id: u64,
 236        client: Arc<Client>,
 237        user_store: ModelHandle<UserStore>,
 238        languages: Arc<LanguageRegistry>,
 239        fs: Arc<dyn Fs>,
 240        cx: &mut AsyncAppContext,
 241    ) -> Result<ModelHandle<Self>> {
 242        client.authenticate_and_connect(&cx).await?;
 243
 244        let response = client
 245            .request(proto::JoinProject {
 246                project_id: remote_id,
 247            })
 248            .await?;
 249
 250        let replica_id = response.replica_id as ReplicaId;
 251
 252        let mut worktrees = Vec::new();
 253        for worktree in response.worktrees {
 254            worktrees
 255                .push(Worktree::remote(remote_id, replica_id, worktree, client.clone(), cx).await?);
 256        }
 257
 258        let user_ids = response
 259            .collaborators
 260            .iter()
 261            .map(|peer| peer.user_id)
 262            .collect();
 263        user_store
 264            .update(cx, |user_store, cx| user_store.load_users(user_ids, cx))
 265            .await?;
 266        let mut collaborators = HashMap::default();
 267        for message in response.collaborators {
 268            let collaborator = Collaborator::from_proto(message, &user_store, cx).await?;
 269            collaborators.insert(collaborator.peer_id, collaborator);
 270        }
 271
 272        Ok(cx.add_model(|cx| {
 273            let mut this = Self {
 274                worktrees: Vec::new(),
 275                open_buffers: Default::default(),
 276                loading_buffers: Default::default(),
 277                shared_buffers: Default::default(),
 278                active_entry: None,
 279                collaborators,
 280                languages,
 281                user_store,
 282                fs,
 283                subscriptions: vec![
 284                    client.subscribe_to_entity(remote_id, cx, Self::handle_unshare_project),
 285                    client.subscribe_to_entity(remote_id, cx, Self::handle_add_collaborator),
 286                    client.subscribe_to_entity(remote_id, cx, Self::handle_remove_collaborator),
 287                    client.subscribe_to_entity(remote_id, cx, Self::handle_share_worktree),
 288                    client.subscribe_to_entity(remote_id, cx, Self::handle_unregister_worktree),
 289                    client.subscribe_to_entity(remote_id, cx, Self::handle_update_worktree),
 290                    client.subscribe_to_entity(
 291                        remote_id,
 292                        cx,
 293                        Self::handle_update_diagnostic_summary,
 294                    ),
 295                    client.subscribe_to_entity(
 296                        remote_id,
 297                        cx,
 298                        Self::handle_disk_based_diagnostics_updating,
 299                    ),
 300                    client.subscribe_to_entity(
 301                        remote_id,
 302                        cx,
 303                        Self::handle_disk_based_diagnostics_updated,
 304                    ),
 305                    client.subscribe_to_entity(remote_id, cx, Self::handle_update_buffer),
 306                    client.subscribe_to_entity(remote_id, cx, Self::handle_buffer_saved),
 307                ],
 308                client,
 309                client_state: ProjectClientState::Remote {
 310                    sharing_has_stopped: false,
 311                    remote_id,
 312                    replica_id,
 313                },
 314                language_servers_with_diagnostics_running: 0,
 315                language_servers: Default::default(),
 316            };
 317            for worktree in worktrees {
 318                this.add_worktree(&worktree, cx);
 319            }
 320            this
 321        }))
 322    }
 323
 324    fn set_remote_id(&mut self, remote_id: Option<u64>, cx: &mut ModelContext<Self>) {
 325        if let ProjectClientState::Local { remote_id_tx, .. } = &mut self.client_state {
 326            *remote_id_tx.borrow_mut() = remote_id;
 327        }
 328
 329        self.subscriptions.clear();
 330        if let Some(remote_id) = remote_id {
 331            let client = &self.client;
 332            self.subscriptions.extend([
 333                client.subscribe_to_entity(remote_id, cx, Self::handle_open_buffer),
 334                client.subscribe_to_entity(remote_id, cx, Self::handle_close_buffer),
 335                client.subscribe_to_entity(remote_id, cx, Self::handle_add_collaborator),
 336                client.subscribe_to_entity(remote_id, cx, Self::handle_remove_collaborator),
 337                client.subscribe_to_entity(remote_id, cx, Self::handle_update_worktree),
 338                client.subscribe_to_entity(remote_id, cx, Self::handle_update_buffer),
 339                client.subscribe_to_entity(remote_id, cx, Self::handle_save_buffer),
 340                client.subscribe_to_entity(remote_id, cx, Self::handle_buffer_saved),
 341                client.subscribe_to_entity(remote_id, cx, Self::handle_format_buffer),
 342            ]);
 343        }
 344    }
 345
 346    pub fn remote_id(&self) -> Option<u64> {
 347        match &self.client_state {
 348            ProjectClientState::Local { remote_id_rx, .. } => *remote_id_rx.borrow(),
 349            ProjectClientState::Remote { remote_id, .. } => Some(*remote_id),
 350        }
 351    }
 352
 353    pub fn next_remote_id(&self) -> impl Future<Output = u64> {
 354        let mut id = None;
 355        let mut watch = None;
 356        match &self.client_state {
 357            ProjectClientState::Local { remote_id_rx, .. } => watch = Some(remote_id_rx.clone()),
 358            ProjectClientState::Remote { remote_id, .. } => id = Some(*remote_id),
 359        }
 360
 361        async move {
 362            if let Some(id) = id {
 363                return id;
 364            }
 365            let mut watch = watch.unwrap();
 366            loop {
 367                let id = *watch.borrow();
 368                if let Some(id) = id {
 369                    return id;
 370                }
 371                watch.recv().await;
 372            }
 373        }
 374    }
 375
 376    pub fn replica_id(&self) -> ReplicaId {
 377        match &self.client_state {
 378            ProjectClientState::Local { .. } => 0,
 379            ProjectClientState::Remote { replica_id, .. } => *replica_id,
 380        }
 381    }
 382
 383    pub fn collaborators(&self) -> &HashMap<PeerId, Collaborator> {
 384        &self.collaborators
 385    }
 386
 387    pub fn worktrees<'a>(
 388        &'a self,
 389        cx: &'a AppContext,
 390    ) -> impl 'a + Iterator<Item = ModelHandle<Worktree>> {
 391        self.worktrees
 392            .iter()
 393            .filter_map(move |worktree| worktree.upgrade(cx))
 394    }
 395
 396    pub fn worktree_for_id(
 397        &self,
 398        id: WorktreeId,
 399        cx: &AppContext,
 400    ) -> Option<ModelHandle<Worktree>> {
 401        self.worktrees(cx)
 402            .find(|worktree| worktree.read(cx).id() == id)
 403    }
 404
 405    pub fn share(&self, cx: &mut ModelContext<Self>) -> Task<anyhow::Result<()>> {
 406        let rpc = self.client.clone();
 407        cx.spawn(|this, mut cx| async move {
 408            let project_id = this.update(&mut cx, |this, _| {
 409                if let ProjectClientState::Local {
 410                    is_shared,
 411                    remote_id_rx,
 412                    ..
 413                } = &mut this.client_state
 414                {
 415                    *is_shared = true;
 416                    remote_id_rx
 417                        .borrow()
 418                        .ok_or_else(|| anyhow!("no project id"))
 419                } else {
 420                    Err(anyhow!("can't share a remote project"))
 421                }
 422            })?;
 423
 424            rpc.request(proto::ShareProject { project_id }).await?;
 425            let mut tasks = Vec::new();
 426            this.update(&mut cx, |this, cx| {
 427                for worktree in this.worktrees(cx).collect::<Vec<_>>() {
 428                    worktree.update(cx, |worktree, cx| {
 429                        let worktree = worktree.as_local_mut().unwrap();
 430                        tasks.push(worktree.share(cx));
 431                    });
 432                }
 433            });
 434            for task in tasks {
 435                task.await?;
 436            }
 437            this.update(&mut cx, |_, cx| cx.notify());
 438            Ok(())
 439        })
 440    }
 441
 442    pub fn unshare(&self, cx: &mut ModelContext<Self>) -> Task<anyhow::Result<()>> {
 443        let rpc = self.client.clone();
 444        cx.spawn(|this, mut cx| async move {
 445            let project_id = this.update(&mut cx, |this, _| {
 446                if let ProjectClientState::Local {
 447                    is_shared,
 448                    remote_id_rx,
 449                    ..
 450                } = &mut this.client_state
 451                {
 452                    *is_shared = false;
 453                    remote_id_rx
 454                        .borrow()
 455                        .ok_or_else(|| anyhow!("no project id"))
 456                } else {
 457                    Err(anyhow!("can't share a remote project"))
 458                }
 459            })?;
 460
 461            rpc.send(proto::UnshareProject { project_id }).await?;
 462            this.update(&mut cx, |this, cx| {
 463                this.collaborators.clear();
 464                for worktree in this.worktrees(cx).collect::<Vec<_>>() {
 465                    worktree.update(cx, |worktree, _| {
 466                        worktree.as_local_mut().unwrap().unshare();
 467                    });
 468                }
 469                cx.notify()
 470            });
 471            Ok(())
 472        })
 473    }
 474
 475    pub fn is_read_only(&self) -> bool {
 476        match &self.client_state {
 477            ProjectClientState::Local { .. } => false,
 478            ProjectClientState::Remote {
 479                sharing_has_stopped,
 480                ..
 481            } => *sharing_has_stopped,
 482        }
 483    }
 484
 485    pub fn is_local(&self) -> bool {
 486        match &self.client_state {
 487            ProjectClientState::Local { .. } => true,
 488            ProjectClientState::Remote { .. } => false,
 489        }
 490    }
 491
 492    pub fn open_buffer(
 493        &mut self,
 494        path: impl Into<ProjectPath>,
 495        cx: &mut ModelContext<Self>,
 496    ) -> Task<Result<ModelHandle<Buffer>>> {
 497        let path = path.into();
 498        let worktree = if let Some(worktree) = self.worktree_for_id(path.worktree_id, cx) {
 499            worktree
 500        } else {
 501            return cx
 502                .foreground()
 503                .spawn(async move { Err(anyhow!("no such worktree")) });
 504        };
 505
 506        // If there is already a buffer for the given path, then return it.
 507        let existing_buffer = self.get_open_buffer(&path, cx);
 508        if let Some(existing_buffer) = existing_buffer {
 509            return cx.foreground().spawn(async move { Ok(existing_buffer) });
 510        }
 511
 512        let mut loading_watch = match self.loading_buffers.entry(path.clone()) {
 513            // If the given path is already being loaded, then wait for that existing
 514            // task to complete and return the same buffer.
 515            hash_map::Entry::Occupied(e) => e.get().clone(),
 516
 517            // Otherwise, record the fact that this path is now being loaded.
 518            hash_map::Entry::Vacant(entry) => {
 519                let (mut tx, rx) = postage::watch::channel();
 520                entry.insert(rx.clone());
 521
 522                let load_buffer = worktree.update(cx, |worktree, cx| match worktree {
 523                    Worktree::Local(worktree) => worktree.open_buffer(&path.path, cx),
 524                    Worktree::Remote(worktree) => worktree.open_buffer(&path.path, cx),
 525                });
 526
 527                cx.spawn(move |this, mut cx| async move {
 528                    let load_result = load_buffer.await;
 529                    *tx.borrow_mut() = Some(this.update(&mut cx, |this, _| {
 530                        // Record the fact that the buffer is no longer loading.
 531                        this.loading_buffers.remove(&path);
 532                        let buffer = load_result.map_err(Arc::new)?;
 533                        this.open_buffers
 534                            .insert(buffer.id(), OpenBuffer::Loaded(buffer.downgrade()));
 535                        Ok((buffer, Arc::new(AtomicBool::new(true))))
 536                    }));
 537                })
 538                .detach();
 539                rx
 540            }
 541        };
 542
 543        cx.spawn(|this, mut cx| async move {
 544            let (buffer, buffer_is_new) = loop {
 545                if let Some(result) = loading_watch.borrow().as_ref() {
 546                    break match result {
 547                        Ok((buf, is_new)) => Ok((buf.clone(), is_new.fetch_and(false, SeqCst))),
 548                        Err(error) => Err(anyhow!("{}", error)),
 549                    };
 550                }
 551                loading_watch.recv().await;
 552            }?;
 553
 554            if buffer_is_new {
 555                this.update(&mut cx, |this, cx| {
 556                    this.assign_language_to_buffer(worktree, buffer.clone(), cx)
 557                });
 558            }
 559            Ok(buffer)
 560        })
 561    }
 562
 563    pub fn save_buffer_as(
 564        &self,
 565        buffer: ModelHandle<Buffer>,
 566        abs_path: PathBuf,
 567        cx: &mut ModelContext<Project>,
 568    ) -> Task<Result<()>> {
 569        let worktree_task = self.find_or_create_worktree_for_abs_path(&abs_path, false, cx);
 570        cx.spawn(|this, mut cx| async move {
 571            let (worktree, path) = worktree_task.await?;
 572            worktree
 573                .update(&mut cx, |worktree, cx| {
 574                    worktree
 575                        .as_local_mut()
 576                        .unwrap()
 577                        .save_buffer_as(buffer.clone(), path, cx)
 578                })
 579                .await?;
 580            this.update(&mut cx, |this, cx| {
 581                this.open_buffers
 582                    .insert(buffer.id(), OpenBuffer::Loaded(buffer.downgrade()));
 583                this.assign_language_to_buffer(worktree, buffer, cx)
 584            });
 585            Ok(())
 586        })
 587    }
 588
 589    #[cfg(any(test, feature = "test-support"))]
 590    pub fn has_open_buffer(&self, path: impl Into<ProjectPath>, cx: &AppContext) -> bool {
 591        let path = path.into();
 592        if let Some(worktree) = self.worktree_for_id(path.worktree_id, cx) {
 593            self.open_buffers.iter().any(|(_, buffer)| {
 594                if let Some(buffer) = buffer.upgrade(cx) {
 595                    if let Some(file) = File::from_dyn(buffer.read(cx).file()) {
 596                        if file.worktree == worktree && file.path() == &path.path {
 597                            return true;
 598                        }
 599                    }
 600                }
 601                false
 602            })
 603        } else {
 604            false
 605        }
 606    }
 607
 608    fn get_open_buffer(
 609        &mut self,
 610        path: &ProjectPath,
 611        cx: &mut ModelContext<Self>,
 612    ) -> Option<ModelHandle<Buffer>> {
 613        let mut result = None;
 614        let worktree = self.worktree_for_id(path.worktree_id, cx)?;
 615        self.open_buffers.retain(|_, buffer| {
 616            if let OpenBuffer::Loaded(buffer) = buffer {
 617                if let Some(buffer) = buffer.upgrade(cx) {
 618                    if let Some(file) = File::from_dyn(buffer.read(cx).file()) {
 619                        if file.worktree == worktree && file.path() == &path.path {
 620                            result = Some(buffer);
 621                        }
 622                    }
 623                    return true;
 624                }
 625            }
 626            false
 627        });
 628        result
 629    }
 630
 631    fn assign_language_to_buffer(
 632        &mut self,
 633        worktree: ModelHandle<Worktree>,
 634        buffer: ModelHandle<Buffer>,
 635        cx: &mut ModelContext<Self>,
 636    ) -> Option<()> {
 637        // Set the buffer's language
 638        let full_path = buffer.read(cx).file()?.full_path();
 639        let language = self.languages.select_language(&full_path)?.clone();
 640        buffer.update(cx, |buffer, cx| {
 641            buffer.set_language(Some(language.clone()), cx);
 642        });
 643
 644        // For local worktrees, start a language server if needed.
 645        let worktree = worktree.read(cx);
 646        let worktree_id = worktree.id();
 647        let worktree_abs_path = worktree.as_local()?.abs_path().clone();
 648        let language_server = match self
 649            .language_servers
 650            .entry((worktree_id, language.name().to_string()))
 651        {
 652            hash_map::Entry::Occupied(e) => Some(e.get().clone()),
 653            hash_map::Entry::Vacant(e) => {
 654                Self::start_language_server(self.client.clone(), language, &worktree_abs_path, cx)
 655                    .map(|server| e.insert(server).clone())
 656            }
 657        };
 658
 659        buffer.update(cx, |buffer, cx| {
 660            buffer.set_language_server(language_server, cx)
 661        });
 662
 663        None
 664    }
 665
 666    fn start_language_server(
 667        rpc: Arc<Client>,
 668        language: Arc<Language>,
 669        worktree_path: &Path,
 670        cx: &mut ModelContext<Self>,
 671    ) -> Option<Arc<LanguageServer>> {
 672        enum LspEvent {
 673            DiagnosticsStart,
 674            DiagnosticsUpdate(lsp::PublishDiagnosticsParams),
 675            DiagnosticsFinish,
 676        }
 677
 678        let language_server = language
 679            .start_server(worktree_path, cx)
 680            .log_err()
 681            .flatten()?;
 682        let disk_based_sources = language
 683            .disk_based_diagnostic_sources()
 684            .cloned()
 685            .unwrap_or_default();
 686        let disk_based_diagnostics_progress_token =
 687            language.disk_based_diagnostics_progress_token().cloned();
 688        let has_disk_based_diagnostic_progress_token =
 689            disk_based_diagnostics_progress_token.is_some();
 690        let (diagnostics_tx, diagnostics_rx) = smol::channel::unbounded();
 691
 692        // Listen for `PublishDiagnostics` notifications.
 693        language_server
 694            .on_notification::<lsp::notification::PublishDiagnostics, _>({
 695                let diagnostics_tx = diagnostics_tx.clone();
 696                move |params| {
 697                    if !has_disk_based_diagnostic_progress_token {
 698                        block_on(diagnostics_tx.send(LspEvent::DiagnosticsStart)).ok();
 699                    }
 700                    block_on(diagnostics_tx.send(LspEvent::DiagnosticsUpdate(params))).ok();
 701                    if !has_disk_based_diagnostic_progress_token {
 702                        block_on(diagnostics_tx.send(LspEvent::DiagnosticsFinish)).ok();
 703                    }
 704                }
 705            })
 706            .detach();
 707
 708        // Listen for `Progress` notifications. Send an event when the language server
 709        // transitions between running jobs and not running any jobs.
 710        let mut running_jobs_for_this_server: i32 = 0;
 711        language_server
 712            .on_notification::<lsp::notification::Progress, _>(move |params| {
 713                let token = match params.token {
 714                    lsp::NumberOrString::Number(_) => None,
 715                    lsp::NumberOrString::String(token) => Some(token),
 716                };
 717
 718                if token == disk_based_diagnostics_progress_token {
 719                    match params.value {
 720                        lsp::ProgressParamsValue::WorkDone(progress) => match progress {
 721                            lsp::WorkDoneProgress::Begin(_) => {
 722                                running_jobs_for_this_server += 1;
 723                                if running_jobs_for_this_server == 1 {
 724                                    block_on(diagnostics_tx.send(LspEvent::DiagnosticsStart)).ok();
 725                                }
 726                            }
 727                            lsp::WorkDoneProgress::End(_) => {
 728                                running_jobs_for_this_server -= 1;
 729                                if running_jobs_for_this_server == 0 {
 730                                    block_on(diagnostics_tx.send(LspEvent::DiagnosticsFinish)).ok();
 731                                }
 732                            }
 733                            _ => {}
 734                        },
 735                    }
 736                }
 737            })
 738            .detach();
 739
 740        // Process all the LSP events.
 741        cx.spawn_weak(|this, mut cx| async move {
 742            while let Ok(message) = diagnostics_rx.recv().await {
 743                let this = cx.read(|cx| this.upgrade(cx))?;
 744                match message {
 745                    LspEvent::DiagnosticsStart => {
 746                        let send = this.update(&mut cx, |this, cx| {
 747                            this.disk_based_diagnostics_started(cx);
 748                            this.remote_id().map(|project_id| {
 749                                rpc.send(proto::DiskBasedDiagnosticsUpdating { project_id })
 750                            })
 751                        });
 752                        if let Some(send) = send {
 753                            send.await.log_err();
 754                        }
 755                    }
 756                    LspEvent::DiagnosticsUpdate(params) => {
 757                        this.update(&mut cx, |this, cx| {
 758                            this.update_diagnostics(params, &disk_based_sources, cx)
 759                                .log_err();
 760                        });
 761                    }
 762                    LspEvent::DiagnosticsFinish => {
 763                        let send = this.update(&mut cx, |this, cx| {
 764                            this.disk_based_diagnostics_finished(cx);
 765                            this.remote_id().map(|project_id| {
 766                                rpc.send(proto::DiskBasedDiagnosticsUpdated { project_id })
 767                            })
 768                        });
 769                        if let Some(send) = send {
 770                            send.await.log_err();
 771                        }
 772                    }
 773                }
 774            }
 775            Some(())
 776        })
 777        .detach();
 778
 779        Some(language_server)
 780    }
 781
 782    pub fn update_diagnostics(
 783        &mut self,
 784        params: lsp::PublishDiagnosticsParams,
 785        disk_based_sources: &HashSet<String>,
 786        cx: &mut ModelContext<Self>,
 787    ) -> Result<()> {
 788        let path = params
 789            .uri
 790            .to_file_path()
 791            .map_err(|_| anyhow!("URI is not a file"))?;
 792        let (worktree, relative_path) = self
 793            .find_worktree_for_abs_path(&path, cx)
 794            .ok_or_else(|| anyhow!("no worktree found for diagnostics"))?;
 795        let project_path = ProjectPath {
 796            worktree_id: worktree.read(cx).id(),
 797            path: relative_path.into(),
 798        };
 799        let mut next_group_id = 0;
 800        let mut diagnostics = Vec::default();
 801        let mut primary_diagnostic_group_ids = HashMap::default();
 802        let mut sources_by_group_id = HashMap::default();
 803        let mut supporting_diagnostic_severities = HashMap::default();
 804        for diagnostic in &params.diagnostics {
 805            let source = diagnostic.source.as_ref();
 806            let code = diagnostic.code.as_ref().map(|code| match code {
 807                lsp::NumberOrString::Number(code) => code.to_string(),
 808                lsp::NumberOrString::String(code) => code.clone(),
 809            });
 810            let range = range_from_lsp(diagnostic.range);
 811            let is_supporting = diagnostic
 812                .related_information
 813                .as_ref()
 814                .map_or(false, |infos| {
 815                    infos.iter().any(|info| {
 816                        primary_diagnostic_group_ids.contains_key(&(
 817                            source,
 818                            code.clone(),
 819                            range_from_lsp(info.location.range),
 820                        ))
 821                    })
 822                });
 823
 824            if is_supporting {
 825                if let Some(severity) = diagnostic.severity {
 826                    supporting_diagnostic_severities
 827                        .insert((source, code.clone(), range), severity);
 828                }
 829            } else {
 830                let group_id = post_inc(&mut next_group_id);
 831                let is_disk_based =
 832                    source.map_or(false, |source| disk_based_sources.contains(source));
 833
 834                sources_by_group_id.insert(group_id, source);
 835                primary_diagnostic_group_ids
 836                    .insert((source, code.clone(), range.clone()), group_id);
 837
 838                diagnostics.push(DiagnosticEntry {
 839                    range,
 840                    diagnostic: Diagnostic {
 841                        code: code.clone(),
 842                        severity: diagnostic.severity.unwrap_or(DiagnosticSeverity::ERROR),
 843                        message: diagnostic.message.clone(),
 844                        group_id,
 845                        is_primary: true,
 846                        is_valid: true,
 847                        is_disk_based,
 848                    },
 849                });
 850                if let Some(infos) = &diagnostic.related_information {
 851                    for info in infos {
 852                        if info.location.uri == params.uri {
 853                            let range = range_from_lsp(info.location.range);
 854                            diagnostics.push(DiagnosticEntry {
 855                                range,
 856                                diagnostic: Diagnostic {
 857                                    code: code.clone(),
 858                                    severity: DiagnosticSeverity::INFORMATION,
 859                                    message: info.message.clone(),
 860                                    group_id,
 861                                    is_primary: false,
 862                                    is_valid: true,
 863                                    is_disk_based,
 864                                },
 865                            });
 866                        }
 867                    }
 868                }
 869            }
 870        }
 871
 872        for entry in &mut diagnostics {
 873            let diagnostic = &mut entry.diagnostic;
 874            if !diagnostic.is_primary {
 875                let source = *sources_by_group_id.get(&diagnostic.group_id).unwrap();
 876                if let Some(&severity) = supporting_diagnostic_severities.get(&(
 877                    source,
 878                    diagnostic.code.clone(),
 879                    entry.range.clone(),
 880                )) {
 881                    diagnostic.severity = severity;
 882                }
 883            }
 884        }
 885
 886        for buffer in self.open_buffers.values() {
 887            if let Some(buffer) = buffer.upgrade(cx) {
 888                if buffer
 889                    .read(cx)
 890                    .file()
 891                    .map_or(false, |file| *file.path() == project_path.path)
 892                {
 893                    buffer.update(cx, |buffer, cx| {
 894                        buffer.update_diagnostics(params.version, diagnostics.clone(), cx)
 895                    })?;
 896                    break;
 897                }
 898            }
 899        }
 900
 901        worktree.update(cx, |worktree, cx| {
 902            worktree
 903                .as_local_mut()
 904                .ok_or_else(|| anyhow!("not a local worktree"))?
 905                .update_diagnostics(project_path.path.clone(), diagnostics, cx)
 906        })?;
 907        cx.emit(Event::DiagnosticsUpdated(project_path));
 908        Ok(())
 909    }
 910
 911    pub fn definition<T: ToOffset>(
 912        &self,
 913        source_buffer_handle: &ModelHandle<Buffer>,
 914        position: T,
 915        cx: &mut ModelContext<Self>,
 916    ) -> Task<Result<Vec<Definition>>> {
 917        let source_buffer_handle = source_buffer_handle.clone();
 918        let buffer = source_buffer_handle.read(cx);
 919        let worktree;
 920        let buffer_abs_path;
 921        if let Some(file) = File::from_dyn(buffer.file()) {
 922            worktree = file.worktree.clone();
 923            buffer_abs_path = file.abs_path();
 924        } else {
 925            return Task::ready(Err(anyhow!("buffer does not belong to any worktree")));
 926        };
 927
 928        if worktree.read(cx).as_local().is_some() {
 929            let point = buffer.offset_to_point_utf16(position.to_offset(buffer));
 930            let buffer_abs_path = buffer_abs_path.unwrap();
 931            let lang_name;
 932            let lang_server;
 933            if let Some(lang) = buffer.language() {
 934                lang_name = lang.name().to_string();
 935                if let Some(server) = self
 936                    .language_servers
 937                    .get(&(worktree.read(cx).id(), lang_name.clone()))
 938                {
 939                    lang_server = server.clone();
 940                } else {
 941                    return Task::ready(Err(anyhow!("buffer does not have a language server")));
 942                };
 943            } else {
 944                return Task::ready(Err(anyhow!("buffer does not have a language")));
 945            }
 946
 947            cx.spawn(|this, mut cx| async move {
 948                let response = lang_server
 949                    .request::<lsp::request::GotoDefinition>(lsp::GotoDefinitionParams {
 950                        text_document_position_params: lsp::TextDocumentPositionParams {
 951                            text_document: lsp::TextDocumentIdentifier::new(
 952                                lsp::Url::from_file_path(&buffer_abs_path).unwrap(),
 953                            ),
 954                            position: lsp::Position::new(point.row, point.column),
 955                        },
 956                        work_done_progress_params: Default::default(),
 957                        partial_result_params: Default::default(),
 958                    })
 959                    .await?;
 960
 961                let mut definitions = Vec::new();
 962                if let Some(response) = response {
 963                    let mut unresolved_locations = Vec::new();
 964                    match response {
 965                        lsp::GotoDefinitionResponse::Scalar(loc) => {
 966                            unresolved_locations.push((loc.uri, loc.range));
 967                        }
 968                        lsp::GotoDefinitionResponse::Array(locs) => {
 969                            unresolved_locations.extend(locs.into_iter().map(|l| (l.uri, l.range)));
 970                        }
 971                        lsp::GotoDefinitionResponse::Link(links) => {
 972                            unresolved_locations.extend(
 973                                links
 974                                    .into_iter()
 975                                    .map(|l| (l.target_uri, l.target_selection_range)),
 976                            );
 977                        }
 978                    }
 979
 980                    for (target_uri, target_range) in unresolved_locations {
 981                        let abs_path = target_uri
 982                            .to_file_path()
 983                            .map_err(|_| anyhow!("invalid target path"))?;
 984
 985                        let (worktree, relative_path) = if let Some(result) = this
 986                            .read_with(&cx, |this, cx| {
 987                                this.find_worktree_for_abs_path(&abs_path, cx)
 988                            }) {
 989                            result
 990                        } else {
 991                            let (worktree, relative_path) = this
 992                                .update(&mut cx, |this, cx| {
 993                                    this.create_worktree_for_abs_path(&abs_path, true, cx)
 994                                })
 995                                .await?;
 996                            this.update(&mut cx, |this, cx| {
 997                                this.language_servers.insert(
 998                                    (worktree.read(cx).id(), lang_name.clone()),
 999                                    lang_server.clone(),
1000                                );
1001                            });
1002                            (worktree, relative_path)
1003                        };
1004
1005                        let project_path = ProjectPath {
1006                            worktree_id: worktree.read_with(&cx, |worktree, _| worktree.id()),
1007                            path: relative_path.into(),
1008                        };
1009                        let target_buffer_handle = this
1010                            .update(&mut cx, |this, cx| this.open_buffer(project_path, cx))
1011                            .await?;
1012                        cx.read(|cx| {
1013                            let target_buffer = target_buffer_handle.read(cx);
1014                            let target_start = target_buffer
1015                                .clip_point_utf16(target_range.start.to_point_utf16(), Bias::Left);
1016                            let target_end = target_buffer
1017                                .clip_point_utf16(target_range.end.to_point_utf16(), Bias::Left);
1018                            definitions.push(Definition {
1019                                target_buffer: target_buffer_handle,
1020                                target_range: target_buffer.anchor_after(target_start)
1021                                    ..target_buffer.anchor_before(target_end),
1022                            });
1023                        });
1024                    }
1025                }
1026
1027                Ok(definitions)
1028            })
1029        } else {
1030            log::info!("go to definition is not yet implemented for guests");
1031            Task::ready(Ok(Default::default()))
1032        }
1033    }
1034
1035    pub fn find_or_create_worktree_for_abs_path(
1036        &self,
1037        abs_path: impl AsRef<Path>,
1038        weak: bool,
1039        cx: &mut ModelContext<Self>,
1040    ) -> Task<Result<(ModelHandle<Worktree>, PathBuf)>> {
1041        let abs_path = abs_path.as_ref();
1042        if let Some((tree, relative_path)) = self.find_worktree_for_abs_path(abs_path, cx) {
1043            Task::ready(Ok((tree.clone(), relative_path.into())))
1044        } else {
1045            self.create_worktree_for_abs_path(abs_path, weak, cx)
1046        }
1047    }
1048
1049    fn create_worktree_for_abs_path(
1050        &self,
1051        abs_path: &Path,
1052        weak: bool,
1053        cx: &mut ModelContext<Self>,
1054    ) -> Task<Result<(ModelHandle<Worktree>, PathBuf)>> {
1055        let worktree = self.add_local_worktree(abs_path, weak, cx);
1056        cx.background().spawn(async move {
1057            let worktree = worktree.await?;
1058            Ok((worktree, PathBuf::new()))
1059        })
1060    }
1061
1062    fn find_worktree_for_abs_path(
1063        &self,
1064        abs_path: &Path,
1065        cx: &AppContext,
1066    ) -> Option<(ModelHandle<Worktree>, PathBuf)> {
1067        for tree in self.worktrees(cx) {
1068            if let Some(relative_path) = tree
1069                .read(cx)
1070                .as_local()
1071                .and_then(|t| abs_path.strip_prefix(t.abs_path()).ok())
1072            {
1073                return Some((tree.clone(), relative_path.into()));
1074            }
1075        }
1076        None
1077    }
1078
1079    pub fn is_shared(&self) -> bool {
1080        match &self.client_state {
1081            ProjectClientState::Local { is_shared, .. } => *is_shared,
1082            ProjectClientState::Remote { .. } => false,
1083        }
1084    }
1085
1086    pub fn add_local_worktree(
1087        &self,
1088        abs_path: impl AsRef<Path>,
1089        weak: bool,
1090        cx: &mut ModelContext<Self>,
1091    ) -> Task<Result<ModelHandle<Worktree>>> {
1092        let fs = self.fs.clone();
1093        let client = self.client.clone();
1094        let path = Arc::from(abs_path.as_ref());
1095        cx.spawn(|project, mut cx| async move {
1096            let worktree = Worktree::local(client.clone(), path, weak, fs, &mut cx).await?;
1097
1098            let (remote_project_id, is_shared) = project.update(&mut cx, |project, cx| {
1099                project.add_worktree(&worktree, cx);
1100                (project.remote_id(), project.is_shared())
1101            });
1102
1103            if let Some(project_id) = remote_project_id {
1104                worktree
1105                    .update(&mut cx, |worktree, cx| {
1106                        worktree.as_local_mut().unwrap().register(project_id, cx)
1107                    })
1108                    .await?;
1109                if is_shared {
1110                    worktree
1111                        .update(&mut cx, |worktree, cx| {
1112                            worktree.as_local_mut().unwrap().share(cx)
1113                        })
1114                        .await?;
1115                }
1116            }
1117
1118            Ok(worktree)
1119        })
1120    }
1121
1122    pub fn remove_worktree(&mut self, id: WorktreeId, cx: &mut ModelContext<Self>) {
1123        self.worktrees.retain(|worktree| {
1124            worktree
1125                .upgrade(cx)
1126                .map_or(false, |w| w.read(cx).id() != id)
1127        });
1128        cx.notify();
1129    }
1130
1131    fn add_worktree(&mut self, worktree: &ModelHandle<Worktree>, cx: &mut ModelContext<Self>) {
1132        cx.observe(&worktree, |_, _, cx| cx.notify()).detach();
1133        cx.subscribe(&worktree, |this, worktree, _, cx| {
1134            this.update_open_buffers(worktree, cx)
1135        })
1136        .detach();
1137
1138        let push_weak_handle = {
1139            let worktree = worktree.read(cx);
1140            worktree.is_local() && worktree.is_weak()
1141        };
1142        if push_weak_handle {
1143            cx.observe_release(&worktree, |this, cx| {
1144                this.worktrees
1145                    .retain(|worktree| worktree.upgrade(cx).is_some());
1146                cx.notify();
1147            })
1148            .detach();
1149            self.worktrees
1150                .push(WorktreeHandle::Weak(worktree.downgrade()));
1151        } else {
1152            self.worktrees
1153                .push(WorktreeHandle::Strong(worktree.clone()));
1154        }
1155        cx.notify();
1156    }
1157
1158    fn update_open_buffers(
1159        &mut self,
1160        worktree_handle: ModelHandle<Worktree>,
1161        cx: &mut ModelContext<Self>,
1162    ) {
1163        let local = worktree_handle.read(cx).is_local();
1164        let snapshot = worktree_handle.read(cx).snapshot();
1165        let worktree_path = snapshot.abs_path();
1166        let mut buffers_to_delete = Vec::new();
1167        for (buffer_id, buffer) in &self.open_buffers {
1168            if let OpenBuffer::Loaded(buffer) = buffer {
1169                if let Some(buffer) = buffer.upgrade(cx) {
1170                    buffer.update(cx, |buffer, cx| {
1171                        if let Some(old_file) = File::from_dyn(buffer.file()) {
1172                            if old_file.worktree != worktree_handle {
1173                                return;
1174                            }
1175
1176                            let new_file = if let Some(entry) = old_file
1177                                .entry_id
1178                                .and_then(|entry_id| snapshot.entry_for_id(entry_id))
1179                            {
1180                                File {
1181                                    is_local: local,
1182                                    worktree_path: worktree_path.clone(),
1183                                    entry_id: Some(entry.id),
1184                                    mtime: entry.mtime,
1185                                    path: entry.path.clone(),
1186                                    worktree: worktree_handle.clone(),
1187                                }
1188                            } else if let Some(entry) =
1189                                snapshot.entry_for_path(old_file.path().as_ref())
1190                            {
1191                                File {
1192                                    is_local: local,
1193                                    worktree_path: worktree_path.clone(),
1194                                    entry_id: Some(entry.id),
1195                                    mtime: entry.mtime,
1196                                    path: entry.path.clone(),
1197                                    worktree: worktree_handle.clone(),
1198                                }
1199                            } else {
1200                                File {
1201                                    is_local: local,
1202                                    worktree_path: worktree_path.clone(),
1203                                    entry_id: None,
1204                                    path: old_file.path().clone(),
1205                                    mtime: old_file.mtime(),
1206                                    worktree: worktree_handle.clone(),
1207                                }
1208                            };
1209
1210                            if let Some(task) = buffer.file_updated(Box::new(new_file), cx) {
1211                                task.detach();
1212                            }
1213                        }
1214                    });
1215                } else {
1216                    buffers_to_delete.push(*buffer_id);
1217                }
1218            }
1219        }
1220
1221        for buffer_id in buffers_to_delete {
1222            self.open_buffers.remove(&buffer_id);
1223        }
1224    }
1225
1226    pub fn set_active_path(&mut self, entry: Option<ProjectPath>, cx: &mut ModelContext<Self>) {
1227        let new_active_entry = entry.and_then(|project_path| {
1228            let worktree = self.worktree_for_id(project_path.worktree_id, cx)?;
1229            let entry = worktree.read(cx).entry_for_path(project_path.path)?;
1230            Some(ProjectEntry {
1231                worktree_id: project_path.worktree_id,
1232                entry_id: entry.id,
1233            })
1234        });
1235        if new_active_entry != self.active_entry {
1236            self.active_entry = new_active_entry;
1237            cx.emit(Event::ActiveEntryChanged(new_active_entry));
1238        }
1239    }
1240
1241    pub fn is_running_disk_based_diagnostics(&self) -> bool {
1242        self.language_servers_with_diagnostics_running > 0
1243    }
1244
1245    pub fn diagnostic_summary(&self, cx: &AppContext) -> DiagnosticSummary {
1246        let mut summary = DiagnosticSummary::default();
1247        for (_, path_summary) in self.diagnostic_summaries(cx) {
1248            summary.error_count += path_summary.error_count;
1249            summary.warning_count += path_summary.warning_count;
1250            summary.info_count += path_summary.info_count;
1251            summary.hint_count += path_summary.hint_count;
1252        }
1253        summary
1254    }
1255
1256    pub fn diagnostic_summaries<'a>(
1257        &'a self,
1258        cx: &'a AppContext,
1259    ) -> impl Iterator<Item = (ProjectPath, DiagnosticSummary)> + 'a {
1260        self.worktrees(cx).flat_map(move |worktree| {
1261            let worktree = worktree.read(cx);
1262            let worktree_id = worktree.id();
1263            worktree
1264                .diagnostic_summaries()
1265                .map(move |(path, summary)| (ProjectPath { worktree_id, path }, summary))
1266        })
1267    }
1268
1269    fn disk_based_diagnostics_started(&mut self, cx: &mut ModelContext<Self>) {
1270        self.language_servers_with_diagnostics_running += 1;
1271        if self.language_servers_with_diagnostics_running == 1 {
1272            cx.emit(Event::DiskBasedDiagnosticsStarted);
1273        }
1274    }
1275
1276    fn disk_based_diagnostics_finished(&mut self, cx: &mut ModelContext<Self>) {
1277        cx.emit(Event::DiskBasedDiagnosticsUpdated);
1278        self.language_servers_with_diagnostics_running -= 1;
1279        if self.language_servers_with_diagnostics_running == 0 {
1280            cx.emit(Event::DiskBasedDiagnosticsFinished);
1281        }
1282    }
1283
1284    pub fn active_entry(&self) -> Option<ProjectEntry> {
1285        self.active_entry
1286    }
1287
1288    // RPC message handlers
1289
1290    fn handle_unshare_project(
1291        &mut self,
1292        _: TypedEnvelope<proto::UnshareProject>,
1293        _: Arc<Client>,
1294        cx: &mut ModelContext<Self>,
1295    ) -> Result<()> {
1296        if let ProjectClientState::Remote {
1297            sharing_has_stopped,
1298            ..
1299        } = &mut self.client_state
1300        {
1301            *sharing_has_stopped = true;
1302            self.collaborators.clear();
1303            cx.notify();
1304            Ok(())
1305        } else {
1306            unreachable!()
1307        }
1308    }
1309
1310    fn handle_add_collaborator(
1311        &mut self,
1312        mut envelope: TypedEnvelope<proto::AddProjectCollaborator>,
1313        _: Arc<Client>,
1314        cx: &mut ModelContext<Self>,
1315    ) -> Result<()> {
1316        let user_store = self.user_store.clone();
1317        let collaborator = envelope
1318            .payload
1319            .collaborator
1320            .take()
1321            .ok_or_else(|| anyhow!("empty collaborator"))?;
1322
1323        cx.spawn(|this, mut cx| {
1324            async move {
1325                let collaborator =
1326                    Collaborator::from_proto(collaborator, &user_store, &mut cx).await?;
1327                this.update(&mut cx, |this, cx| {
1328                    this.collaborators
1329                        .insert(collaborator.peer_id, collaborator);
1330                    cx.notify();
1331                });
1332                Ok(())
1333            }
1334            .log_err()
1335        })
1336        .detach();
1337
1338        Ok(())
1339    }
1340
1341    fn handle_remove_collaborator(
1342        &mut self,
1343        envelope: TypedEnvelope<proto::RemoveProjectCollaborator>,
1344        _: Arc<Client>,
1345        cx: &mut ModelContext<Self>,
1346    ) -> Result<()> {
1347        let peer_id = PeerId(envelope.payload.peer_id);
1348        let replica_id = self
1349            .collaborators
1350            .remove(&peer_id)
1351            .ok_or_else(|| anyhow!("unknown peer {:?}", peer_id))?
1352            .replica_id;
1353        self.shared_buffers.remove(&peer_id);
1354        for (_, buffer) in &self.open_buffers {
1355            if let OpenBuffer::Loaded(buffer) = buffer {
1356                if let Some(buffer) = buffer.upgrade(cx) {
1357                    buffer.update(cx, |buffer, cx| buffer.remove_peer(replica_id, cx));
1358                }
1359            }
1360        }
1361        cx.notify();
1362        Ok(())
1363    }
1364
1365    fn handle_share_worktree(
1366        &mut self,
1367        envelope: TypedEnvelope<proto::ShareWorktree>,
1368        client: Arc<Client>,
1369        cx: &mut ModelContext<Self>,
1370    ) -> Result<()> {
1371        let remote_id = self.remote_id().ok_or_else(|| anyhow!("invalid project"))?;
1372        let replica_id = self.replica_id();
1373        let worktree = envelope
1374            .payload
1375            .worktree
1376            .ok_or_else(|| anyhow!("invalid worktree"))?;
1377        cx.spawn(|this, mut cx| {
1378            async move {
1379                let worktree =
1380                    Worktree::remote(remote_id, replica_id, worktree, client, &mut cx).await?;
1381                this.update(&mut cx, |this, cx| this.add_worktree(&worktree, cx));
1382                Ok(())
1383            }
1384            .log_err()
1385        })
1386        .detach();
1387        Ok(())
1388    }
1389
1390    fn handle_unregister_worktree(
1391        &mut self,
1392        envelope: TypedEnvelope<proto::UnregisterWorktree>,
1393        _: Arc<Client>,
1394        cx: &mut ModelContext<Self>,
1395    ) -> Result<()> {
1396        let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
1397        self.remove_worktree(worktree_id, cx);
1398        Ok(())
1399    }
1400
1401    fn handle_update_worktree(
1402        &mut self,
1403        envelope: TypedEnvelope<proto::UpdateWorktree>,
1404        _: Arc<Client>,
1405        cx: &mut ModelContext<Self>,
1406    ) -> Result<()> {
1407        let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
1408        if let Some(worktree) = self.worktree_for_id(worktree_id, cx) {
1409            worktree.update(cx, |worktree, cx| {
1410                let worktree = worktree.as_remote_mut().unwrap();
1411                worktree.update_from_remote(envelope, cx)
1412            })?;
1413        }
1414        Ok(())
1415    }
1416
1417    fn handle_update_diagnostic_summary(
1418        &mut self,
1419        envelope: TypedEnvelope<proto::UpdateDiagnosticSummary>,
1420        _: Arc<Client>,
1421        cx: &mut ModelContext<Self>,
1422    ) -> Result<()> {
1423        let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
1424        if let Some(worktree) = self.worktree_for_id(worktree_id, cx) {
1425            if let Some(summary) = envelope.payload.summary {
1426                let project_path = ProjectPath {
1427                    worktree_id,
1428                    path: Path::new(&summary.path).into(),
1429                };
1430                worktree.update(cx, |worktree, _| {
1431                    worktree
1432                        .as_remote_mut()
1433                        .unwrap()
1434                        .update_diagnostic_summary(project_path.path.clone(), &summary);
1435                });
1436                cx.emit(Event::DiagnosticsUpdated(project_path));
1437            }
1438        }
1439        Ok(())
1440    }
1441
1442    fn handle_disk_based_diagnostics_updating(
1443        &mut self,
1444        _: TypedEnvelope<proto::DiskBasedDiagnosticsUpdating>,
1445        _: Arc<Client>,
1446        cx: &mut ModelContext<Self>,
1447    ) -> Result<()> {
1448        self.disk_based_diagnostics_started(cx);
1449        Ok(())
1450    }
1451
1452    fn handle_disk_based_diagnostics_updated(
1453        &mut self,
1454        _: TypedEnvelope<proto::DiskBasedDiagnosticsUpdated>,
1455        _: Arc<Client>,
1456        cx: &mut ModelContext<Self>,
1457    ) -> Result<()> {
1458        self.disk_based_diagnostics_finished(cx);
1459        Ok(())
1460    }
1461
1462    pub fn handle_update_buffer(
1463        &mut self,
1464        envelope: TypedEnvelope<proto::UpdateBuffer>,
1465        _: Arc<Client>,
1466        cx: &mut ModelContext<Self>,
1467    ) -> Result<()> {
1468        let payload = envelope.payload.clone();
1469        let buffer_id = payload.buffer_id as usize;
1470        let ops = payload
1471            .operations
1472            .into_iter()
1473            .map(|op| language::proto::deserialize_operation(op))
1474            .collect::<Result<Vec<_>, _>>()?;
1475        match self.open_buffers.get_mut(&buffer_id) {
1476            Some(OpenBuffer::Operations(pending_ops)) => pending_ops.extend(ops),
1477            Some(OpenBuffer::Loaded(buffer)) => {
1478                if let Some(buffer) = buffer.upgrade(cx) {
1479                    buffer.update(cx, |buffer, cx| buffer.apply_ops(ops, cx))?;
1480                } else {
1481                    self.open_buffers
1482                        .insert(buffer_id, OpenBuffer::Operations(ops));
1483                }
1484            }
1485            None => {
1486                self.open_buffers
1487                    .insert(buffer_id, OpenBuffer::Operations(ops));
1488            }
1489        }
1490        Ok(())
1491    }
1492
1493    pub fn handle_save_buffer(
1494        &mut self,
1495        envelope: TypedEnvelope<proto::SaveBuffer>,
1496        rpc: Arc<Client>,
1497        cx: &mut ModelContext<Self>,
1498    ) -> Result<()> {
1499        let sender_id = envelope.original_sender_id()?;
1500        let project_id = self.remote_id().ok_or_else(|| anyhow!("not connected"))?;
1501        let buffer = self
1502            .shared_buffers
1503            .get(&sender_id)
1504            .and_then(|shared_buffers| shared_buffers.get(&envelope.payload.buffer_id).cloned())
1505            .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))?;
1506        let receipt = envelope.receipt();
1507        let worktree_id = envelope.payload.worktree_id;
1508        let buffer_id = envelope.payload.buffer_id;
1509        let save = cx.spawn(|_, mut cx| async move {
1510            buffer.update(&mut cx, |buffer, cx| buffer.save(cx)).await
1511        });
1512
1513        cx.background()
1514            .spawn(
1515                async move {
1516                    let (version, mtime) = save.await?;
1517
1518                    rpc.respond(
1519                        receipt,
1520                        proto::BufferSaved {
1521                            project_id,
1522                            worktree_id,
1523                            buffer_id,
1524                            version: (&version).into(),
1525                            mtime: Some(mtime.into()),
1526                        },
1527                    )
1528                    .await?;
1529
1530                    Ok(())
1531                }
1532                .log_err(),
1533            )
1534            .detach();
1535        Ok(())
1536    }
1537
1538    pub fn handle_format_buffer(
1539        &mut self,
1540        envelope: TypedEnvelope<proto::FormatBuffer>,
1541        rpc: Arc<Client>,
1542        cx: &mut ModelContext<Self>,
1543    ) -> Result<()> {
1544        let receipt = envelope.receipt();
1545        let sender_id = envelope.original_sender_id()?;
1546        let buffer = self
1547            .shared_buffers
1548            .get(&sender_id)
1549            .and_then(|shared_buffers| shared_buffers.get(&envelope.payload.buffer_id).cloned())
1550            .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))?;
1551        cx.spawn(|_, mut cx| async move {
1552            let format = buffer.update(&mut cx, |buffer, cx| buffer.format(cx)).await;
1553            // We spawn here in order to enqueue the sending of `Ack` *after* transmission of edits
1554            // associated with formatting.
1555            cx.spawn(|_| async move {
1556                match format {
1557                    Ok(()) => rpc.respond(receipt, proto::Ack {}).await?,
1558                    Err(error) => {
1559                        rpc.respond_with_error(
1560                            receipt,
1561                            proto::Error {
1562                                message: error.to_string(),
1563                            },
1564                        )
1565                        .await?
1566                    }
1567                }
1568                Ok::<_, anyhow::Error>(())
1569            })
1570            .await
1571            .log_err();
1572        })
1573        .detach();
1574        Ok(())
1575    }
1576
1577    pub fn handle_open_buffer(
1578        &mut self,
1579        envelope: TypedEnvelope<proto::OpenBuffer>,
1580        rpc: Arc<Client>,
1581        cx: &mut ModelContext<Self>,
1582    ) -> anyhow::Result<()> {
1583        let receipt = envelope.receipt();
1584        let peer_id = envelope.original_sender_id()?;
1585        let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
1586        let open_buffer = self.open_buffer(
1587            ProjectPath {
1588                worktree_id,
1589                path: PathBuf::from(envelope.payload.path).into(),
1590            },
1591            cx,
1592        );
1593        cx.spawn(|this, mut cx| {
1594            async move {
1595                let buffer = open_buffer.await?;
1596                this.update(&mut cx, |this, _| {
1597                    this.shared_buffers
1598                        .entry(peer_id)
1599                        .or_default()
1600                        .insert(buffer.id() as u64, buffer.clone());
1601                });
1602                let message = buffer.read_with(&cx, |buffer, _| buffer.to_proto());
1603                rpc.respond(
1604                    receipt,
1605                    proto::OpenBufferResponse {
1606                        buffer: Some(message),
1607                    },
1608                )
1609                .await
1610            }
1611            .log_err()
1612        })
1613        .detach();
1614        Ok(())
1615    }
1616
1617    pub fn handle_close_buffer(
1618        &mut self,
1619        envelope: TypedEnvelope<proto::CloseBuffer>,
1620        _: Arc<Client>,
1621        cx: &mut ModelContext<Self>,
1622    ) -> anyhow::Result<()> {
1623        if let Some(shared_buffers) = self.shared_buffers.get_mut(&envelope.original_sender_id()?) {
1624            shared_buffers.remove(&envelope.payload.buffer_id);
1625            cx.notify();
1626        }
1627        Ok(())
1628    }
1629
1630    pub fn handle_buffer_saved(
1631        &mut self,
1632        envelope: TypedEnvelope<proto::BufferSaved>,
1633        _: Arc<Client>,
1634        cx: &mut ModelContext<Self>,
1635    ) -> Result<()> {
1636        let payload = envelope.payload.clone();
1637        let buffer = self
1638            .open_buffers
1639            .get(&(payload.buffer_id as usize))
1640            .and_then(|buf| {
1641                if let OpenBuffer::Loaded(buffer) = buf {
1642                    buffer.upgrade(cx)
1643                } else {
1644                    None
1645                }
1646            });
1647        if let Some(buffer) = buffer {
1648            buffer.update(cx, |buffer, cx| {
1649                let version = payload.version.try_into()?;
1650                let mtime = payload
1651                    .mtime
1652                    .ok_or_else(|| anyhow!("missing mtime"))?
1653                    .into();
1654                buffer.did_save(version, mtime, None, cx);
1655                Result::<_, anyhow::Error>::Ok(())
1656            })?;
1657        }
1658        Ok(())
1659    }
1660
1661    pub fn match_paths<'a>(
1662        &self,
1663        query: &'a str,
1664        include_ignored: bool,
1665        smart_case: bool,
1666        max_results: usize,
1667        cancel_flag: &'a AtomicBool,
1668        cx: &AppContext,
1669    ) -> impl 'a + Future<Output = Vec<PathMatch>> {
1670        let worktrees = self
1671            .worktrees(cx)
1672            .filter(|worktree| !worktree.read(cx).is_weak())
1673            .collect::<Vec<_>>();
1674        let include_root_name = worktrees.len() > 1;
1675        let candidate_sets = worktrees
1676            .into_iter()
1677            .map(|worktree| CandidateSet {
1678                snapshot: worktree.read(cx).snapshot(),
1679                include_ignored,
1680                include_root_name,
1681            })
1682            .collect::<Vec<_>>();
1683
1684        let background = cx.background().clone();
1685        async move {
1686            fuzzy::match_paths(
1687                candidate_sets.as_slice(),
1688                query,
1689                smart_case,
1690                max_results,
1691                cancel_flag,
1692                background,
1693            )
1694            .await
1695        }
1696    }
1697}
1698
1699impl WorktreeHandle {
1700    pub fn upgrade(&self, cx: &AppContext) -> Option<ModelHandle<Worktree>> {
1701        match self {
1702            WorktreeHandle::Strong(handle) => Some(handle.clone()),
1703            WorktreeHandle::Weak(handle) => handle.upgrade(cx),
1704        }
1705    }
1706}
1707
1708struct CandidateSet {
1709    snapshot: Snapshot,
1710    include_ignored: bool,
1711    include_root_name: bool,
1712}
1713
1714impl<'a> PathMatchCandidateSet<'a> for CandidateSet {
1715    type Candidates = CandidateSetIter<'a>;
1716
1717    fn id(&self) -> usize {
1718        self.snapshot.id().to_usize()
1719    }
1720
1721    fn len(&self) -> usize {
1722        if self.include_ignored {
1723            self.snapshot.file_count()
1724        } else {
1725            self.snapshot.visible_file_count()
1726        }
1727    }
1728
1729    fn prefix(&self) -> Arc<str> {
1730        if self.snapshot.root_entry().map_or(false, |e| e.is_file()) {
1731            self.snapshot.root_name().into()
1732        } else if self.include_root_name {
1733            format!("{}/", self.snapshot.root_name()).into()
1734        } else {
1735            "".into()
1736        }
1737    }
1738
1739    fn candidates(&'a self, start: usize) -> Self::Candidates {
1740        CandidateSetIter {
1741            traversal: self.snapshot.files(self.include_ignored, start),
1742        }
1743    }
1744}
1745
1746struct CandidateSetIter<'a> {
1747    traversal: Traversal<'a>,
1748}
1749
1750impl<'a> Iterator for CandidateSetIter<'a> {
1751    type Item = PathMatchCandidate<'a>;
1752
1753    fn next(&mut self) -> Option<Self::Item> {
1754        self.traversal.next().map(|entry| {
1755            if let EntryKind::File(char_bag) = entry.kind {
1756                PathMatchCandidate {
1757                    path: &entry.path,
1758                    char_bag,
1759                }
1760            } else {
1761                unreachable!()
1762            }
1763        })
1764    }
1765}
1766
1767impl Entity for Project {
1768    type Event = Event;
1769
1770    fn release(&mut self, cx: &mut gpui::MutableAppContext) {
1771        match &self.client_state {
1772            ProjectClientState::Local { remote_id_rx, .. } => {
1773                if let Some(project_id) = *remote_id_rx.borrow() {
1774                    let rpc = self.client.clone();
1775                    cx.spawn(|_| async move {
1776                        if let Err(err) = rpc.send(proto::UnregisterProject { project_id }).await {
1777                            log::error!("error unregistering project: {}", err);
1778                        }
1779                    })
1780                    .detach();
1781                }
1782            }
1783            ProjectClientState::Remote { remote_id, .. } => {
1784                let rpc = self.client.clone();
1785                let project_id = *remote_id;
1786                cx.spawn(|_| async move {
1787                    if let Err(err) = rpc.send(proto::LeaveProject { project_id }).await {
1788                        log::error!("error leaving project: {}", err);
1789                    }
1790                })
1791                .detach();
1792            }
1793        }
1794    }
1795
1796    fn app_will_quit(
1797        &mut self,
1798        _: &mut MutableAppContext,
1799    ) -> Option<std::pin::Pin<Box<dyn 'static + Future<Output = ()>>>> {
1800        use futures::FutureExt;
1801
1802        let shutdown_futures = self
1803            .language_servers
1804            .drain()
1805            .filter_map(|(_, server)| server.shutdown())
1806            .collect::<Vec<_>>();
1807        Some(
1808            async move {
1809                futures::future::join_all(shutdown_futures).await;
1810            }
1811            .boxed(),
1812        )
1813    }
1814}
1815
1816impl Collaborator {
1817    fn from_proto(
1818        message: proto::Collaborator,
1819        user_store: &ModelHandle<UserStore>,
1820        cx: &mut AsyncAppContext,
1821    ) -> impl Future<Output = Result<Self>> {
1822        let user = user_store.update(cx, |user_store, cx| {
1823            user_store.fetch_user(message.user_id, cx)
1824        });
1825
1826        async move {
1827            Ok(Self {
1828                peer_id: PeerId(message.peer_id),
1829                user: user.await?,
1830                replica_id: message.replica_id as ReplicaId,
1831            })
1832        }
1833    }
1834}
1835
1836impl<P: AsRef<Path>> From<(WorktreeId, P)> for ProjectPath {
1837    fn from((worktree_id, path): (WorktreeId, P)) -> Self {
1838        Self {
1839            worktree_id,
1840            path: path.as_ref().into(),
1841        }
1842    }
1843}
1844
1845impl OpenBuffer {
1846    fn upgrade(&self, cx: &AppContext) -> Option<ModelHandle<Buffer>> {
1847        match self {
1848            OpenBuffer::Loaded(buffer) => buffer.upgrade(cx),
1849            OpenBuffer::Operations(_) => None,
1850        }
1851    }
1852}
1853
1854#[cfg(test)]
1855mod tests {
1856    use super::{Event, *};
1857    use client::test::FakeHttpClient;
1858    use fs::RealFs;
1859    use futures::StreamExt;
1860    use gpui::{test::subscribe, TestAppContext};
1861    use language::{
1862        tree_sitter_rust, AnchorRangeExt, Diagnostic, LanguageConfig, LanguageRegistry,
1863        LanguageServerConfig, Point,
1864    };
1865    use lsp::Url;
1866    use serde_json::json;
1867    use std::{cell::RefCell, os::unix, path::PathBuf, rc::Rc};
1868    use unindent::Unindent as _;
1869    use util::test::temp_tree;
1870    use worktree::WorktreeHandle as _;
1871
1872    #[gpui::test]
1873    async fn test_populate_and_search(mut cx: gpui::TestAppContext) {
1874        let dir = temp_tree(json!({
1875            "root": {
1876                "apple": "",
1877                "banana": {
1878                    "carrot": {
1879                        "date": "",
1880                        "endive": "",
1881                    }
1882                },
1883                "fennel": {
1884                    "grape": "",
1885                }
1886            }
1887        }));
1888
1889        let root_link_path = dir.path().join("root_link");
1890        unix::fs::symlink(&dir.path().join("root"), &root_link_path).unwrap();
1891        unix::fs::symlink(
1892            &dir.path().join("root/fennel"),
1893            &dir.path().join("root/finnochio"),
1894        )
1895        .unwrap();
1896
1897        let project = build_project(Arc::new(RealFs), &mut cx);
1898
1899        let (tree, _) = project
1900            .update(&mut cx, |project, cx| {
1901                project.find_or_create_worktree_for_abs_path(&root_link_path, false, cx)
1902            })
1903            .await
1904            .unwrap();
1905
1906        cx.read(|cx| tree.read(cx).as_local().unwrap().scan_complete())
1907            .await;
1908        cx.read(|cx| {
1909            let tree = tree.read(cx);
1910            assert_eq!(tree.file_count(), 5);
1911            assert_eq!(
1912                tree.inode_for_path("fennel/grape"),
1913                tree.inode_for_path("finnochio/grape")
1914            );
1915        });
1916
1917        let cancel_flag = Default::default();
1918        let results = project
1919            .read_with(&cx, |project, cx| {
1920                project.match_paths("bna", false, false, 10, &cancel_flag, cx)
1921            })
1922            .await;
1923        assert_eq!(
1924            results
1925                .into_iter()
1926                .map(|result| result.path)
1927                .collect::<Vec<Arc<Path>>>(),
1928            vec![
1929                PathBuf::from("banana/carrot/date").into(),
1930                PathBuf::from("banana/carrot/endive").into(),
1931            ]
1932        );
1933    }
1934
1935    #[gpui::test]
1936    async fn test_language_server_diagnostics(mut cx: gpui::TestAppContext) {
1937        let (language_server_config, mut fake_server) =
1938            LanguageServerConfig::fake(cx.background()).await;
1939        let progress_token = language_server_config
1940            .disk_based_diagnostics_progress_token
1941            .clone()
1942            .unwrap();
1943
1944        let mut languages = LanguageRegistry::new();
1945        languages.add(Arc::new(Language::new(
1946            LanguageConfig {
1947                name: "Rust".to_string(),
1948                path_suffixes: vec!["rs".to_string()],
1949                language_server: Some(language_server_config),
1950                ..Default::default()
1951            },
1952            Some(tree_sitter_rust::language()),
1953        )));
1954
1955        let dir = temp_tree(json!({
1956            "a.rs": "fn a() { A }",
1957            "b.rs": "const y: i32 = 1",
1958        }));
1959
1960        let http_client = FakeHttpClient::with_404_response();
1961        let client = Client::new(http_client.clone());
1962        let user_store = cx.add_model(|cx| UserStore::new(client.clone(), http_client, cx));
1963
1964        let project = cx.update(|cx| {
1965            Project::local(
1966                client,
1967                user_store,
1968                Arc::new(languages),
1969                Arc::new(RealFs),
1970                cx,
1971            )
1972        });
1973
1974        let (tree, _) = project
1975            .update(&mut cx, |project, cx| {
1976                project.find_or_create_worktree_for_abs_path(dir.path(), false, cx)
1977            })
1978            .await
1979            .unwrap();
1980        let worktree_id = tree.read_with(&cx, |tree, _| tree.id());
1981
1982        cx.read(|cx| tree.read(cx).as_local().unwrap().scan_complete())
1983            .await;
1984
1985        // Cause worktree to start the fake language server
1986        let _buffer = project
1987            .update(&mut cx, |project, cx| {
1988                project.open_buffer(
1989                    ProjectPath {
1990                        worktree_id,
1991                        path: Path::new("b.rs").into(),
1992                    },
1993                    cx,
1994                )
1995            })
1996            .await
1997            .unwrap();
1998
1999        let mut events = subscribe(&project, &mut cx);
2000
2001        fake_server.start_progress(&progress_token).await;
2002        assert_eq!(
2003            events.next().await.unwrap(),
2004            Event::DiskBasedDiagnosticsStarted
2005        );
2006
2007        fake_server.start_progress(&progress_token).await;
2008        fake_server.end_progress(&progress_token).await;
2009        fake_server.start_progress(&progress_token).await;
2010
2011        fake_server
2012            .notify::<lsp::notification::PublishDiagnostics>(lsp::PublishDiagnosticsParams {
2013                uri: Url::from_file_path(dir.path().join("a.rs")).unwrap(),
2014                version: None,
2015                diagnostics: vec![lsp::Diagnostic {
2016                    range: lsp::Range::new(lsp::Position::new(0, 9), lsp::Position::new(0, 10)),
2017                    severity: Some(lsp::DiagnosticSeverity::ERROR),
2018                    message: "undefined variable 'A'".to_string(),
2019                    ..Default::default()
2020                }],
2021            })
2022            .await;
2023        assert_eq!(
2024            events.next().await.unwrap(),
2025            Event::DiagnosticsUpdated(ProjectPath {
2026                worktree_id,
2027                path: Arc::from(Path::new("a.rs"))
2028            })
2029        );
2030
2031        fake_server.end_progress(&progress_token).await;
2032        fake_server.end_progress(&progress_token).await;
2033        assert_eq!(
2034            events.next().await.unwrap(),
2035            Event::DiskBasedDiagnosticsUpdated
2036        );
2037        assert_eq!(
2038            events.next().await.unwrap(),
2039            Event::DiskBasedDiagnosticsFinished
2040        );
2041
2042        let buffer = project
2043            .update(&mut cx, |p, cx| p.open_buffer((worktree_id, "a.rs"), cx))
2044            .await
2045            .unwrap();
2046
2047        buffer.read_with(&cx, |buffer, _| {
2048            let snapshot = buffer.snapshot();
2049            let diagnostics = snapshot
2050                .diagnostics_in_range::<_, Point>(0..buffer.len())
2051                .collect::<Vec<_>>();
2052            assert_eq!(
2053                diagnostics,
2054                &[DiagnosticEntry {
2055                    range: Point::new(0, 9)..Point::new(0, 10),
2056                    diagnostic: Diagnostic {
2057                        severity: lsp::DiagnosticSeverity::ERROR,
2058                        message: "undefined variable 'A'".to_string(),
2059                        group_id: 0,
2060                        is_primary: true,
2061                        ..Default::default()
2062                    }
2063                }]
2064            )
2065        });
2066    }
2067
2068    #[gpui::test]
2069    async fn test_search_worktree_without_files(mut cx: gpui::TestAppContext) {
2070        let dir = temp_tree(json!({
2071            "root": {
2072                "dir1": {},
2073                "dir2": {
2074                    "dir3": {}
2075                }
2076            }
2077        }));
2078
2079        let project = build_project(Arc::new(RealFs), &mut cx);
2080        let (tree, _) = project
2081            .update(&mut cx, |project, cx| {
2082                project.find_or_create_worktree_for_abs_path(&dir.path(), false, cx)
2083            })
2084            .await
2085            .unwrap();
2086
2087        cx.read(|cx| tree.read(cx).as_local().unwrap().scan_complete())
2088            .await;
2089
2090        let cancel_flag = Default::default();
2091        let results = project
2092            .read_with(&cx, |project, cx| {
2093                project.match_paths("dir", false, false, 10, &cancel_flag, cx)
2094            })
2095            .await;
2096
2097        assert!(results.is_empty());
2098    }
2099
2100    #[gpui::test]
2101    async fn test_definition(mut cx: gpui::TestAppContext) {
2102        let (language_server_config, mut fake_server) =
2103            LanguageServerConfig::fake(cx.background()).await;
2104
2105        let mut languages = LanguageRegistry::new();
2106        languages.add(Arc::new(Language::new(
2107            LanguageConfig {
2108                name: "Rust".to_string(),
2109                path_suffixes: vec!["rs".to_string()],
2110                language_server: Some(language_server_config),
2111                ..Default::default()
2112            },
2113            Some(tree_sitter_rust::language()),
2114        )));
2115
2116        let dir = temp_tree(json!({
2117            "a.rs": "const fn a() { A }",
2118            "b.rs": "const y: i32 = crate::a()",
2119        }));
2120
2121        let http_client = FakeHttpClient::with_404_response();
2122        let client = Client::new(http_client.clone());
2123        let user_store = cx.add_model(|cx| UserStore::new(client.clone(), http_client, cx));
2124        let project = cx.update(|cx| {
2125            Project::local(
2126                client,
2127                user_store,
2128                Arc::new(languages),
2129                Arc::new(RealFs),
2130                cx,
2131            )
2132        });
2133
2134        let (tree, _) = project
2135            .update(&mut cx, |project, cx| {
2136                project.find_or_create_worktree_for_abs_path(dir.path().join("b.rs"), false, cx)
2137            })
2138            .await
2139            .unwrap();
2140        let worktree_id = tree.read_with(&cx, |tree, _| tree.id());
2141        cx.read(|cx| tree.read(cx).as_local().unwrap().scan_complete())
2142            .await;
2143
2144        // Cause worktree to start the fake language server
2145        let buffer = project
2146            .update(&mut cx, |project, cx| {
2147                project.open_buffer(
2148                    ProjectPath {
2149                        worktree_id,
2150                        path: Path::new("").into(),
2151                    },
2152                    cx,
2153                )
2154            })
2155            .await
2156            .unwrap();
2157        let definitions =
2158            project.update(&mut cx, |project, cx| project.definition(&buffer, 22, cx));
2159        let (request_id, request) = fake_server
2160            .receive_request::<lsp::request::GotoDefinition>()
2161            .await;
2162        let request_params = request.text_document_position_params;
2163        assert_eq!(
2164            request_params.text_document.uri.to_file_path().unwrap(),
2165            dir.path().join("b.rs")
2166        );
2167        assert_eq!(request_params.position, lsp::Position::new(0, 22));
2168
2169        fake_server
2170            .respond(
2171                request_id,
2172                Some(lsp::GotoDefinitionResponse::Scalar(lsp::Location::new(
2173                    lsp::Url::from_file_path(dir.path().join("a.rs")).unwrap(),
2174                    lsp::Range::new(lsp::Position::new(0, 9), lsp::Position::new(0, 10)),
2175                ))),
2176            )
2177            .await;
2178        let mut definitions = definitions.await.unwrap();
2179        assert_eq!(definitions.len(), 1);
2180        let definition = definitions.pop().unwrap();
2181        cx.update(|cx| {
2182            let target_buffer = definition.target_buffer.read(cx);
2183            assert_eq!(
2184                target_buffer.file().unwrap().abs_path(),
2185                Some(dir.path().join("a.rs"))
2186            );
2187            assert_eq!(definition.target_range.to_offset(target_buffer), 9..10);
2188            assert_eq!(
2189                list_worktrees(&project, cx),
2190                [
2191                    (dir.path().join("b.rs"), false),
2192                    (dir.path().join("a.rs"), true)
2193                ]
2194            );
2195
2196            drop(definition);
2197        });
2198        cx.read(|cx| {
2199            assert_eq!(
2200                list_worktrees(&project, cx),
2201                [(dir.path().join("b.rs"), false)]
2202            );
2203        });
2204
2205        fn list_worktrees(project: &ModelHandle<Project>, cx: &AppContext) -> Vec<(PathBuf, bool)> {
2206            project
2207                .read(cx)
2208                .worktrees(cx)
2209                .map(|worktree| {
2210                    let worktree = worktree.read(cx);
2211                    (
2212                        worktree.as_local().unwrap().abs_path().to_path_buf(),
2213                        worktree.is_weak(),
2214                    )
2215                })
2216                .collect::<Vec<_>>()
2217        }
2218    }
2219
2220    #[gpui::test]
2221    async fn test_save_file(mut cx: gpui::TestAppContext) {
2222        let fs = Arc::new(FakeFs::new());
2223        fs.insert_tree(
2224            "/dir",
2225            json!({
2226                "file1": "the old contents",
2227            }),
2228        )
2229        .await;
2230
2231        let project = build_project(fs.clone(), &mut cx);
2232        let worktree_id = project
2233            .update(&mut cx, |p, cx| p.add_local_worktree("/dir", false, cx))
2234            .await
2235            .unwrap()
2236            .read_with(&cx, |tree, _| tree.id());
2237
2238        let buffer = project
2239            .update(&mut cx, |p, cx| p.open_buffer((worktree_id, "file1"), cx))
2240            .await
2241            .unwrap();
2242        buffer
2243            .update(&mut cx, |buffer, cx| {
2244                assert_eq!(buffer.text(), "the old contents");
2245                buffer.edit(Some(0..0), "a line of text.\n".repeat(10 * 1024), cx);
2246                buffer.save(cx)
2247            })
2248            .await
2249            .unwrap();
2250
2251        let new_text = fs.load(Path::new("/dir/file1")).await.unwrap();
2252        assert_eq!(new_text, buffer.read_with(&cx, |buffer, _| buffer.text()));
2253    }
2254
2255    #[gpui::test]
2256    async fn test_save_in_single_file_worktree(mut cx: gpui::TestAppContext) {
2257        let fs = Arc::new(FakeFs::new());
2258        fs.insert_tree(
2259            "/dir",
2260            json!({
2261                "file1": "the old contents",
2262            }),
2263        )
2264        .await;
2265
2266        let project = build_project(fs.clone(), &mut cx);
2267        let worktree_id = project
2268            .update(&mut cx, |p, cx| {
2269                p.add_local_worktree("/dir/file1", false, cx)
2270            })
2271            .await
2272            .unwrap()
2273            .read_with(&cx, |tree, _| tree.id());
2274
2275        let buffer = project
2276            .update(&mut cx, |p, cx| p.open_buffer((worktree_id, ""), cx))
2277            .await
2278            .unwrap();
2279        buffer
2280            .update(&mut cx, |buffer, cx| {
2281                buffer.edit(Some(0..0), "a line of text.\n".repeat(10 * 1024), cx);
2282                buffer.save(cx)
2283            })
2284            .await
2285            .unwrap();
2286
2287        let new_text = fs.load(Path::new("/dir/file1")).await.unwrap();
2288        assert_eq!(new_text, buffer.read_with(&cx, |buffer, _| buffer.text()));
2289    }
2290
2291    #[gpui::test]
2292    async fn test_rescan_and_remote_updates(mut cx: gpui::TestAppContext) {
2293        let dir = temp_tree(json!({
2294            "a": {
2295                "file1": "",
2296                "file2": "",
2297                "file3": "",
2298            },
2299            "b": {
2300                "c": {
2301                    "file4": "",
2302                    "file5": "",
2303                }
2304            }
2305        }));
2306
2307        let project = build_project(Arc::new(RealFs), &mut cx);
2308        let rpc = project.read_with(&cx, |p, _| p.client.clone());
2309
2310        let tree = project
2311            .update(&mut cx, |p, cx| p.add_local_worktree(dir.path(), false, cx))
2312            .await
2313            .unwrap();
2314        let worktree_id = tree.read_with(&cx, |tree, _| tree.id());
2315
2316        let buffer_for_path = |path: &'static str, cx: &mut gpui::TestAppContext| {
2317            let buffer = project.update(cx, |p, cx| p.open_buffer((worktree_id, path), cx));
2318            async move { buffer.await.unwrap() }
2319        };
2320        let id_for_path = |path: &'static str, cx: &gpui::TestAppContext| {
2321            tree.read_with(cx, |tree, _| {
2322                tree.entry_for_path(path)
2323                    .expect(&format!("no entry for path {}", path))
2324                    .id
2325            })
2326        };
2327
2328        let buffer2 = buffer_for_path("a/file2", &mut cx).await;
2329        let buffer3 = buffer_for_path("a/file3", &mut cx).await;
2330        let buffer4 = buffer_for_path("b/c/file4", &mut cx).await;
2331        let buffer5 = buffer_for_path("b/c/file5", &mut cx).await;
2332
2333        let file2_id = id_for_path("a/file2", &cx);
2334        let file3_id = id_for_path("a/file3", &cx);
2335        let file4_id = id_for_path("b/c/file4", &cx);
2336
2337        // Wait for the initial scan.
2338        cx.read(|cx| tree.read(cx).as_local().unwrap().scan_complete())
2339            .await;
2340
2341        // Create a remote copy of this worktree.
2342        let initial_snapshot = tree.read_with(&cx, |tree, _| tree.snapshot());
2343        let remote = Worktree::remote(
2344            1,
2345            1,
2346            initial_snapshot.to_proto(&Default::default(), Default::default()),
2347            rpc.clone(),
2348            &mut cx.to_async(),
2349        )
2350        .await
2351        .unwrap();
2352
2353        cx.read(|cx| {
2354            assert!(!buffer2.read(cx).is_dirty());
2355            assert!(!buffer3.read(cx).is_dirty());
2356            assert!(!buffer4.read(cx).is_dirty());
2357            assert!(!buffer5.read(cx).is_dirty());
2358        });
2359
2360        // Rename and delete files and directories.
2361        tree.flush_fs_events(&cx).await;
2362        std::fs::rename(dir.path().join("a/file3"), dir.path().join("b/c/file3")).unwrap();
2363        std::fs::remove_file(dir.path().join("b/c/file5")).unwrap();
2364        std::fs::rename(dir.path().join("b/c"), dir.path().join("d")).unwrap();
2365        std::fs::rename(dir.path().join("a/file2"), dir.path().join("a/file2.new")).unwrap();
2366        tree.flush_fs_events(&cx).await;
2367
2368        let expected_paths = vec![
2369            "a",
2370            "a/file1",
2371            "a/file2.new",
2372            "b",
2373            "d",
2374            "d/file3",
2375            "d/file4",
2376        ];
2377
2378        cx.read(|app| {
2379            assert_eq!(
2380                tree.read(app)
2381                    .paths()
2382                    .map(|p| p.to_str().unwrap())
2383                    .collect::<Vec<_>>(),
2384                expected_paths
2385            );
2386
2387            assert_eq!(id_for_path("a/file2.new", &cx), file2_id);
2388            assert_eq!(id_for_path("d/file3", &cx), file3_id);
2389            assert_eq!(id_for_path("d/file4", &cx), file4_id);
2390
2391            assert_eq!(
2392                buffer2.read(app).file().unwrap().path().as_ref(),
2393                Path::new("a/file2.new")
2394            );
2395            assert_eq!(
2396                buffer3.read(app).file().unwrap().path().as_ref(),
2397                Path::new("d/file3")
2398            );
2399            assert_eq!(
2400                buffer4.read(app).file().unwrap().path().as_ref(),
2401                Path::new("d/file4")
2402            );
2403            assert_eq!(
2404                buffer5.read(app).file().unwrap().path().as_ref(),
2405                Path::new("b/c/file5")
2406            );
2407
2408            assert!(!buffer2.read(app).file().unwrap().is_deleted());
2409            assert!(!buffer3.read(app).file().unwrap().is_deleted());
2410            assert!(!buffer4.read(app).file().unwrap().is_deleted());
2411            assert!(buffer5.read(app).file().unwrap().is_deleted());
2412        });
2413
2414        // Update the remote worktree. Check that it becomes consistent with the
2415        // local worktree.
2416        remote.update(&mut cx, |remote, cx| {
2417            let update_message =
2418                tree.read(cx)
2419                    .snapshot()
2420                    .build_update(&initial_snapshot, 1, 1, true);
2421            remote
2422                .as_remote_mut()
2423                .unwrap()
2424                .snapshot
2425                .apply_update(update_message)
2426                .unwrap();
2427
2428            assert_eq!(
2429                remote
2430                    .paths()
2431                    .map(|p| p.to_str().unwrap())
2432                    .collect::<Vec<_>>(),
2433                expected_paths
2434            );
2435        });
2436    }
2437
2438    #[gpui::test]
2439    async fn test_buffer_deduping(mut cx: gpui::TestAppContext) {
2440        let fs = Arc::new(FakeFs::new());
2441        fs.insert_tree(
2442            "/the-dir",
2443            json!({
2444                "a.txt": "a-contents",
2445                "b.txt": "b-contents",
2446            }),
2447        )
2448        .await;
2449
2450        let project = build_project(fs.clone(), &mut cx);
2451        let worktree_id = project
2452            .update(&mut cx, |p, cx| p.add_local_worktree("/the-dir", false, cx))
2453            .await
2454            .unwrap()
2455            .read_with(&cx, |tree, _| tree.id());
2456
2457        // Spawn multiple tasks to open paths, repeating some paths.
2458        let (buffer_a_1, buffer_b, buffer_a_2) = project.update(&mut cx, |p, cx| {
2459            (
2460                p.open_buffer((worktree_id, "a.txt"), cx),
2461                p.open_buffer((worktree_id, "b.txt"), cx),
2462                p.open_buffer((worktree_id, "a.txt"), cx),
2463            )
2464        });
2465
2466        let buffer_a_1 = buffer_a_1.await.unwrap();
2467        let buffer_a_2 = buffer_a_2.await.unwrap();
2468        let buffer_b = buffer_b.await.unwrap();
2469        assert_eq!(buffer_a_1.read_with(&cx, |b, _| b.text()), "a-contents");
2470        assert_eq!(buffer_b.read_with(&cx, |b, _| b.text()), "b-contents");
2471
2472        // There is only one buffer per path.
2473        let buffer_a_id = buffer_a_1.id();
2474        assert_eq!(buffer_a_2.id(), buffer_a_id);
2475
2476        // Open the same path again while it is still open.
2477        drop(buffer_a_1);
2478        let buffer_a_3 = project
2479            .update(&mut cx, |p, cx| p.open_buffer((worktree_id, "a.txt"), cx))
2480            .await
2481            .unwrap();
2482
2483        // There's still only one buffer per path.
2484        assert_eq!(buffer_a_3.id(), buffer_a_id);
2485    }
2486
2487    #[gpui::test]
2488    async fn test_buffer_is_dirty(mut cx: gpui::TestAppContext) {
2489        use std::fs;
2490
2491        let dir = temp_tree(json!({
2492            "file1": "abc",
2493            "file2": "def",
2494            "file3": "ghi",
2495        }));
2496
2497        let project = build_project(Arc::new(RealFs), &mut cx);
2498        let worktree = project
2499            .update(&mut cx, |p, cx| p.add_local_worktree(dir.path(), false, cx))
2500            .await
2501            .unwrap();
2502        let worktree_id = worktree.read_with(&cx, |worktree, _| worktree.id());
2503
2504        worktree.flush_fs_events(&cx).await;
2505        worktree
2506            .read_with(&cx, |t, _| t.as_local().unwrap().scan_complete())
2507            .await;
2508
2509        let buffer1 = project
2510            .update(&mut cx, |p, cx| p.open_buffer((worktree_id, "file1"), cx))
2511            .await
2512            .unwrap();
2513        let events = Rc::new(RefCell::new(Vec::new()));
2514
2515        // initially, the buffer isn't dirty.
2516        buffer1.update(&mut cx, |buffer, cx| {
2517            cx.subscribe(&buffer1, {
2518                let events = events.clone();
2519                move |_, _, event, _| events.borrow_mut().push(event.clone())
2520            })
2521            .detach();
2522
2523            assert!(!buffer.is_dirty());
2524            assert!(events.borrow().is_empty());
2525
2526            buffer.edit(vec![1..2], "", cx);
2527        });
2528
2529        // after the first edit, the buffer is dirty, and emits a dirtied event.
2530        buffer1.update(&mut cx, |buffer, cx| {
2531            assert!(buffer.text() == "ac");
2532            assert!(buffer.is_dirty());
2533            assert_eq!(
2534                *events.borrow(),
2535                &[language::Event::Edited, language::Event::Dirtied]
2536            );
2537            events.borrow_mut().clear();
2538            buffer.did_save(buffer.version(), buffer.file().unwrap().mtime(), None, cx);
2539        });
2540
2541        // after saving, the buffer is not dirty, and emits a saved event.
2542        buffer1.update(&mut cx, |buffer, cx| {
2543            assert!(!buffer.is_dirty());
2544            assert_eq!(*events.borrow(), &[language::Event::Saved]);
2545            events.borrow_mut().clear();
2546
2547            buffer.edit(vec![1..1], "B", cx);
2548            buffer.edit(vec![2..2], "D", cx);
2549        });
2550
2551        // after editing again, the buffer is dirty, and emits another dirty event.
2552        buffer1.update(&mut cx, |buffer, cx| {
2553            assert!(buffer.text() == "aBDc");
2554            assert!(buffer.is_dirty());
2555            assert_eq!(
2556                *events.borrow(),
2557                &[
2558                    language::Event::Edited,
2559                    language::Event::Dirtied,
2560                    language::Event::Edited,
2561                ],
2562            );
2563            events.borrow_mut().clear();
2564
2565            // TODO - currently, after restoring the buffer to its
2566            // previously-saved state, the is still considered dirty.
2567            buffer.edit([1..3], "", cx);
2568            assert!(buffer.text() == "ac");
2569            assert!(buffer.is_dirty());
2570        });
2571
2572        assert_eq!(*events.borrow(), &[language::Event::Edited]);
2573
2574        // When a file is deleted, the buffer is considered dirty.
2575        let events = Rc::new(RefCell::new(Vec::new()));
2576        let buffer2 = project
2577            .update(&mut cx, |p, cx| p.open_buffer((worktree_id, "file2"), cx))
2578            .await
2579            .unwrap();
2580        buffer2.update(&mut cx, |_, cx| {
2581            cx.subscribe(&buffer2, {
2582                let events = events.clone();
2583                move |_, _, event, _| events.borrow_mut().push(event.clone())
2584            })
2585            .detach();
2586        });
2587
2588        fs::remove_file(dir.path().join("file2")).unwrap();
2589        buffer2.condition(&cx, |b, _| b.is_dirty()).await;
2590        assert_eq!(
2591            *events.borrow(),
2592            &[language::Event::Dirtied, language::Event::FileHandleChanged]
2593        );
2594
2595        // When a file is already dirty when deleted, we don't emit a Dirtied event.
2596        let events = Rc::new(RefCell::new(Vec::new()));
2597        let buffer3 = project
2598            .update(&mut cx, |p, cx| p.open_buffer((worktree_id, "file3"), cx))
2599            .await
2600            .unwrap();
2601        buffer3.update(&mut cx, |_, cx| {
2602            cx.subscribe(&buffer3, {
2603                let events = events.clone();
2604                move |_, _, event, _| events.borrow_mut().push(event.clone())
2605            })
2606            .detach();
2607        });
2608
2609        worktree.flush_fs_events(&cx).await;
2610        buffer3.update(&mut cx, |buffer, cx| {
2611            buffer.edit(Some(0..0), "x", cx);
2612        });
2613        events.borrow_mut().clear();
2614        fs::remove_file(dir.path().join("file3")).unwrap();
2615        buffer3
2616            .condition(&cx, |_, _| !events.borrow().is_empty())
2617            .await;
2618        assert_eq!(*events.borrow(), &[language::Event::FileHandleChanged]);
2619        cx.read(|cx| assert!(buffer3.read(cx).is_dirty()));
2620    }
2621
2622    #[gpui::test]
2623    async fn test_buffer_file_changes_on_disk(mut cx: gpui::TestAppContext) {
2624        use std::fs;
2625
2626        let initial_contents = "aaa\nbbbbb\nc\n";
2627        let dir = temp_tree(json!({ "the-file": initial_contents }));
2628
2629        let project = build_project(Arc::new(RealFs), &mut cx);
2630        let worktree = project
2631            .update(&mut cx, |p, cx| p.add_local_worktree(dir.path(), false, cx))
2632            .await
2633            .unwrap();
2634        let worktree_id = worktree.read_with(&cx, |tree, _| tree.id());
2635
2636        worktree
2637            .read_with(&cx, |t, _| t.as_local().unwrap().scan_complete())
2638            .await;
2639
2640        let abs_path = dir.path().join("the-file");
2641        let buffer = project
2642            .update(&mut cx, |p, cx| {
2643                p.open_buffer((worktree_id, "the-file"), cx)
2644            })
2645            .await
2646            .unwrap();
2647
2648        // TODO
2649        // Add a cursor on each row.
2650        // let selection_set_id = buffer.update(&mut cx, |buffer, cx| {
2651        //     assert!(!buffer.is_dirty());
2652        //     buffer.add_selection_set(
2653        //         &(0..3)
2654        //             .map(|row| Selection {
2655        //                 id: row as usize,
2656        //                 start: Point::new(row, 1),
2657        //                 end: Point::new(row, 1),
2658        //                 reversed: false,
2659        //                 goal: SelectionGoal::None,
2660        //             })
2661        //             .collect::<Vec<_>>(),
2662        //         cx,
2663        //     )
2664        // });
2665
2666        // Change the file on disk, adding two new lines of text, and removing
2667        // one line.
2668        buffer.read_with(&cx, |buffer, _| {
2669            assert!(!buffer.is_dirty());
2670            assert!(!buffer.has_conflict());
2671        });
2672        let new_contents = "AAAA\naaa\nBB\nbbbbb\n";
2673        fs::write(&abs_path, new_contents).unwrap();
2674
2675        // Because the buffer was not modified, it is reloaded from disk. Its
2676        // contents are edited according to the diff between the old and new
2677        // file contents.
2678        buffer
2679            .condition(&cx, |buffer, _| buffer.text() == new_contents)
2680            .await;
2681
2682        buffer.update(&mut cx, |buffer, _| {
2683            assert_eq!(buffer.text(), new_contents);
2684            assert!(!buffer.is_dirty());
2685            assert!(!buffer.has_conflict());
2686
2687            // TODO
2688            // let cursor_positions = buffer
2689            //     .selection_set(selection_set_id)
2690            //     .unwrap()
2691            //     .selections::<Point>(&*buffer)
2692            //     .map(|selection| {
2693            //         assert_eq!(selection.start, selection.end);
2694            //         selection.start
2695            //     })
2696            //     .collect::<Vec<_>>();
2697            // assert_eq!(
2698            //     cursor_positions,
2699            //     [Point::new(1, 1), Point::new(3, 1), Point::new(4, 0)]
2700            // );
2701        });
2702
2703        // Modify the buffer
2704        buffer.update(&mut cx, |buffer, cx| {
2705            buffer.edit(vec![0..0], " ", cx);
2706            assert!(buffer.is_dirty());
2707            assert!(!buffer.has_conflict());
2708        });
2709
2710        // Change the file on disk again, adding blank lines to the beginning.
2711        fs::write(&abs_path, "\n\n\nAAAA\naaa\nBB\nbbbbb\n").unwrap();
2712
2713        // Because the buffer is modified, it doesn't reload from disk, but is
2714        // marked as having a conflict.
2715        buffer
2716            .condition(&cx, |buffer, _| buffer.has_conflict())
2717            .await;
2718    }
2719
2720    #[gpui::test]
2721    async fn test_grouped_diagnostics(mut cx: gpui::TestAppContext) {
2722        let fs = Arc::new(FakeFs::new());
2723        fs.insert_tree(
2724            "/the-dir",
2725            json!({
2726                "a.rs": "
2727                    fn foo(mut v: Vec<usize>) {
2728                        for x in &v {
2729                            v.push(1);
2730                        }
2731                    }
2732                "
2733                .unindent(),
2734            }),
2735        )
2736        .await;
2737
2738        let project = build_project(fs.clone(), &mut cx);
2739        let worktree = project
2740            .update(&mut cx, |p, cx| p.add_local_worktree("/the-dir", false, cx))
2741            .await
2742            .unwrap();
2743        let worktree_id = worktree.read_with(&cx, |tree, _| tree.id());
2744
2745        let buffer = project
2746            .update(&mut cx, |p, cx| p.open_buffer((worktree_id, "a.rs"), cx))
2747            .await
2748            .unwrap();
2749
2750        let buffer_uri = Url::from_file_path("/the-dir/a.rs").unwrap();
2751        let message = lsp::PublishDiagnosticsParams {
2752            uri: buffer_uri.clone(),
2753            diagnostics: vec![
2754                lsp::Diagnostic {
2755                    range: lsp::Range::new(lsp::Position::new(1, 8), lsp::Position::new(1, 9)),
2756                    severity: Some(DiagnosticSeverity::WARNING),
2757                    message: "error 1".to_string(),
2758                    related_information: Some(vec![lsp::DiagnosticRelatedInformation {
2759                        location: lsp::Location {
2760                            uri: buffer_uri.clone(),
2761                            range: lsp::Range::new(
2762                                lsp::Position::new(1, 8),
2763                                lsp::Position::new(1, 9),
2764                            ),
2765                        },
2766                        message: "error 1 hint 1".to_string(),
2767                    }]),
2768                    ..Default::default()
2769                },
2770                lsp::Diagnostic {
2771                    range: lsp::Range::new(lsp::Position::new(1, 8), lsp::Position::new(1, 9)),
2772                    severity: Some(DiagnosticSeverity::HINT),
2773                    message: "error 1 hint 1".to_string(),
2774                    related_information: Some(vec![lsp::DiagnosticRelatedInformation {
2775                        location: lsp::Location {
2776                            uri: buffer_uri.clone(),
2777                            range: lsp::Range::new(
2778                                lsp::Position::new(1, 8),
2779                                lsp::Position::new(1, 9),
2780                            ),
2781                        },
2782                        message: "original diagnostic".to_string(),
2783                    }]),
2784                    ..Default::default()
2785                },
2786                lsp::Diagnostic {
2787                    range: lsp::Range::new(lsp::Position::new(2, 8), lsp::Position::new(2, 17)),
2788                    severity: Some(DiagnosticSeverity::ERROR),
2789                    message: "error 2".to_string(),
2790                    related_information: Some(vec![
2791                        lsp::DiagnosticRelatedInformation {
2792                            location: lsp::Location {
2793                                uri: buffer_uri.clone(),
2794                                range: lsp::Range::new(
2795                                    lsp::Position::new(1, 13),
2796                                    lsp::Position::new(1, 15),
2797                                ),
2798                            },
2799                            message: "error 2 hint 1".to_string(),
2800                        },
2801                        lsp::DiagnosticRelatedInformation {
2802                            location: lsp::Location {
2803                                uri: buffer_uri.clone(),
2804                                range: lsp::Range::new(
2805                                    lsp::Position::new(1, 13),
2806                                    lsp::Position::new(1, 15),
2807                                ),
2808                            },
2809                            message: "error 2 hint 2".to_string(),
2810                        },
2811                    ]),
2812                    ..Default::default()
2813                },
2814                lsp::Diagnostic {
2815                    range: lsp::Range::new(lsp::Position::new(1, 13), lsp::Position::new(1, 15)),
2816                    severity: Some(DiagnosticSeverity::HINT),
2817                    message: "error 2 hint 1".to_string(),
2818                    related_information: Some(vec![lsp::DiagnosticRelatedInformation {
2819                        location: lsp::Location {
2820                            uri: buffer_uri.clone(),
2821                            range: lsp::Range::new(
2822                                lsp::Position::new(2, 8),
2823                                lsp::Position::new(2, 17),
2824                            ),
2825                        },
2826                        message: "original diagnostic".to_string(),
2827                    }]),
2828                    ..Default::default()
2829                },
2830                lsp::Diagnostic {
2831                    range: lsp::Range::new(lsp::Position::new(1, 13), lsp::Position::new(1, 15)),
2832                    severity: Some(DiagnosticSeverity::HINT),
2833                    message: "error 2 hint 2".to_string(),
2834                    related_information: Some(vec![lsp::DiagnosticRelatedInformation {
2835                        location: lsp::Location {
2836                            uri: buffer_uri.clone(),
2837                            range: lsp::Range::new(
2838                                lsp::Position::new(2, 8),
2839                                lsp::Position::new(2, 17),
2840                            ),
2841                        },
2842                        message: "original diagnostic".to_string(),
2843                    }]),
2844                    ..Default::default()
2845                },
2846            ],
2847            version: None,
2848        };
2849
2850        project
2851            .update(&mut cx, |p, cx| {
2852                p.update_diagnostics(message, &Default::default(), cx)
2853            })
2854            .unwrap();
2855        let buffer = buffer.read_with(&cx, |buffer, _| buffer.snapshot());
2856
2857        assert_eq!(
2858            buffer
2859                .diagnostics_in_range::<_, Point>(0..buffer.len())
2860                .collect::<Vec<_>>(),
2861            &[
2862                DiagnosticEntry {
2863                    range: Point::new(1, 8)..Point::new(1, 9),
2864                    diagnostic: Diagnostic {
2865                        severity: DiagnosticSeverity::WARNING,
2866                        message: "error 1".to_string(),
2867                        group_id: 0,
2868                        is_primary: true,
2869                        ..Default::default()
2870                    }
2871                },
2872                DiagnosticEntry {
2873                    range: Point::new(1, 8)..Point::new(1, 9),
2874                    diagnostic: Diagnostic {
2875                        severity: DiagnosticSeverity::HINT,
2876                        message: "error 1 hint 1".to_string(),
2877                        group_id: 0,
2878                        is_primary: false,
2879                        ..Default::default()
2880                    }
2881                },
2882                DiagnosticEntry {
2883                    range: Point::new(1, 13)..Point::new(1, 15),
2884                    diagnostic: Diagnostic {
2885                        severity: DiagnosticSeverity::HINT,
2886                        message: "error 2 hint 1".to_string(),
2887                        group_id: 1,
2888                        is_primary: false,
2889                        ..Default::default()
2890                    }
2891                },
2892                DiagnosticEntry {
2893                    range: Point::new(1, 13)..Point::new(1, 15),
2894                    diagnostic: Diagnostic {
2895                        severity: DiagnosticSeverity::HINT,
2896                        message: "error 2 hint 2".to_string(),
2897                        group_id: 1,
2898                        is_primary: false,
2899                        ..Default::default()
2900                    }
2901                },
2902                DiagnosticEntry {
2903                    range: Point::new(2, 8)..Point::new(2, 17),
2904                    diagnostic: Diagnostic {
2905                        severity: DiagnosticSeverity::ERROR,
2906                        message: "error 2".to_string(),
2907                        group_id: 1,
2908                        is_primary: true,
2909                        ..Default::default()
2910                    }
2911                }
2912            ]
2913        );
2914
2915        assert_eq!(
2916            buffer.diagnostic_group::<Point>(0).collect::<Vec<_>>(),
2917            &[
2918                DiagnosticEntry {
2919                    range: Point::new(1, 8)..Point::new(1, 9),
2920                    diagnostic: Diagnostic {
2921                        severity: DiagnosticSeverity::WARNING,
2922                        message: "error 1".to_string(),
2923                        group_id: 0,
2924                        is_primary: true,
2925                        ..Default::default()
2926                    }
2927                },
2928                DiagnosticEntry {
2929                    range: Point::new(1, 8)..Point::new(1, 9),
2930                    diagnostic: Diagnostic {
2931                        severity: DiagnosticSeverity::HINT,
2932                        message: "error 1 hint 1".to_string(),
2933                        group_id: 0,
2934                        is_primary: false,
2935                        ..Default::default()
2936                    }
2937                },
2938            ]
2939        );
2940        assert_eq!(
2941            buffer.diagnostic_group::<Point>(1).collect::<Vec<_>>(),
2942            &[
2943                DiagnosticEntry {
2944                    range: Point::new(1, 13)..Point::new(1, 15),
2945                    diagnostic: Diagnostic {
2946                        severity: DiagnosticSeverity::HINT,
2947                        message: "error 2 hint 1".to_string(),
2948                        group_id: 1,
2949                        is_primary: false,
2950                        ..Default::default()
2951                    }
2952                },
2953                DiagnosticEntry {
2954                    range: Point::new(1, 13)..Point::new(1, 15),
2955                    diagnostic: Diagnostic {
2956                        severity: DiagnosticSeverity::HINT,
2957                        message: "error 2 hint 2".to_string(),
2958                        group_id: 1,
2959                        is_primary: false,
2960                        ..Default::default()
2961                    }
2962                },
2963                DiagnosticEntry {
2964                    range: Point::new(2, 8)..Point::new(2, 17),
2965                    diagnostic: Diagnostic {
2966                        severity: DiagnosticSeverity::ERROR,
2967                        message: "error 2".to_string(),
2968                        group_id: 1,
2969                        is_primary: true,
2970                        ..Default::default()
2971                    }
2972                }
2973            ]
2974        );
2975    }
2976
2977    fn build_project(fs: Arc<dyn Fs>, cx: &mut TestAppContext) -> ModelHandle<Project> {
2978        let languages = Arc::new(LanguageRegistry::new());
2979        let http_client = FakeHttpClient::with_404_response();
2980        let client = client::Client::new(http_client.clone());
2981        let user_store = cx.add_model(|cx| UserStore::new(client.clone(), http_client, cx));
2982        cx.update(|cx| Project::local(client, user_store, languages, fs, cx))
2983    }
2984}