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(project_id, 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, cx| {
 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.insert(
 534                            buffer.read(cx).remote_id() as usize,
 535                            OpenBuffer::Loaded(buffer.downgrade()),
 536                        );
 537                        Ok((buffer, Arc::new(AtomicBool::new(true))))
 538                    }));
 539                })
 540                .detach();
 541                rx
 542            }
 543        };
 544
 545        cx.spawn(|this, mut cx| async move {
 546            let (buffer, buffer_is_new) = loop {
 547                if let Some(result) = loading_watch.borrow().as_ref() {
 548                    break match result {
 549                        Ok((buf, is_new)) => Ok((buf.clone(), is_new.fetch_and(false, SeqCst))),
 550                        Err(error) => Err(anyhow!("{}", error)),
 551                    };
 552                }
 553                loading_watch.recv().await;
 554            }?;
 555
 556            if buffer_is_new {
 557                this.update(&mut cx, |this, cx| {
 558                    this.assign_language_to_buffer(worktree, buffer.clone(), cx)
 559                });
 560            }
 561            Ok(buffer)
 562        })
 563    }
 564
 565    pub fn save_buffer_as(
 566        &self,
 567        buffer: ModelHandle<Buffer>,
 568        abs_path: PathBuf,
 569        cx: &mut ModelContext<Project>,
 570    ) -> Task<Result<()>> {
 571        let worktree_task = self.find_or_create_worktree_for_abs_path(&abs_path, false, cx);
 572        cx.spawn(|this, mut cx| async move {
 573            let (worktree, path) = worktree_task.await?;
 574            worktree
 575                .update(&mut cx, |worktree, cx| {
 576                    worktree
 577                        .as_local_mut()
 578                        .unwrap()
 579                        .save_buffer_as(buffer.clone(), path, cx)
 580                })
 581                .await?;
 582            this.update(&mut cx, |this, cx| {
 583                this.open_buffers
 584                    .insert(buffer.id(), OpenBuffer::Loaded(buffer.downgrade()));
 585                this.assign_language_to_buffer(worktree, buffer, cx)
 586            });
 587            Ok(())
 588        })
 589    }
 590
 591    #[cfg(any(test, feature = "test-support"))]
 592    pub fn has_open_buffer(&self, path: impl Into<ProjectPath>, cx: &AppContext) -> bool {
 593        let path = path.into();
 594        if let Some(worktree) = self.worktree_for_id(path.worktree_id, cx) {
 595            self.open_buffers.iter().any(|(_, buffer)| {
 596                if let Some(buffer) = buffer.upgrade(cx) {
 597                    if let Some(file) = File::from_dyn(buffer.read(cx).file()) {
 598                        if file.worktree == worktree && file.path() == &path.path {
 599                            return true;
 600                        }
 601                    }
 602                }
 603                false
 604            })
 605        } else {
 606            false
 607        }
 608    }
 609
 610    fn get_open_buffer(
 611        &mut self,
 612        path: &ProjectPath,
 613        cx: &mut ModelContext<Self>,
 614    ) -> Option<ModelHandle<Buffer>> {
 615        let mut result = None;
 616        let worktree = self.worktree_for_id(path.worktree_id, cx)?;
 617        self.open_buffers.retain(|_, buffer| {
 618            if let OpenBuffer::Loaded(buffer) = buffer {
 619                if let Some(buffer) = buffer.upgrade(cx) {
 620                    if let Some(file) = File::from_dyn(buffer.read(cx).file()) {
 621                        if file.worktree == worktree && file.path() == &path.path {
 622                            result = Some(buffer);
 623                        }
 624                    }
 625                    return true;
 626                }
 627            }
 628            false
 629        });
 630        result
 631    }
 632
 633    fn assign_language_to_buffer(
 634        &mut self,
 635        worktree: ModelHandle<Worktree>,
 636        buffer: ModelHandle<Buffer>,
 637        cx: &mut ModelContext<Self>,
 638    ) -> Option<()> {
 639        // Set the buffer's language
 640        let full_path = buffer.read(cx).file()?.full_path();
 641        let language = self.languages.select_language(&full_path)?.clone();
 642        buffer.update(cx, |buffer, cx| {
 643            buffer.set_language(Some(language.clone()), cx);
 644        });
 645
 646        // For local worktrees, start a language server if needed.
 647        let worktree = worktree.read(cx);
 648        let worktree_id = worktree.id();
 649        let worktree_abs_path = worktree.as_local()?.abs_path().clone();
 650        let language_server = match self
 651            .language_servers
 652            .entry((worktree_id, language.name().to_string()))
 653        {
 654            hash_map::Entry::Occupied(e) => Some(e.get().clone()),
 655            hash_map::Entry::Vacant(e) => {
 656                Self::start_language_server(self.client.clone(), language, &worktree_abs_path, cx)
 657                    .map(|server| e.insert(server).clone())
 658            }
 659        };
 660
 661        buffer.update(cx, |buffer, cx| {
 662            buffer.set_language_server(language_server, cx)
 663        });
 664
 665        None
 666    }
 667
 668    fn start_language_server(
 669        rpc: Arc<Client>,
 670        language: Arc<Language>,
 671        worktree_path: &Path,
 672        cx: &mut ModelContext<Self>,
 673    ) -> Option<Arc<LanguageServer>> {
 674        enum LspEvent {
 675            DiagnosticsStart,
 676            DiagnosticsUpdate(lsp::PublishDiagnosticsParams),
 677            DiagnosticsFinish,
 678        }
 679
 680        let language_server = language
 681            .start_server(worktree_path, cx)
 682            .log_err()
 683            .flatten()?;
 684        let disk_based_sources = language
 685            .disk_based_diagnostic_sources()
 686            .cloned()
 687            .unwrap_or_default();
 688        let disk_based_diagnostics_progress_token =
 689            language.disk_based_diagnostics_progress_token().cloned();
 690        let has_disk_based_diagnostic_progress_token =
 691            disk_based_diagnostics_progress_token.is_some();
 692        let (diagnostics_tx, diagnostics_rx) = smol::channel::unbounded();
 693
 694        // Listen for `PublishDiagnostics` notifications.
 695        language_server
 696            .on_notification::<lsp::notification::PublishDiagnostics, _>({
 697                let diagnostics_tx = diagnostics_tx.clone();
 698                move |params| {
 699                    if !has_disk_based_diagnostic_progress_token {
 700                        block_on(diagnostics_tx.send(LspEvent::DiagnosticsStart)).ok();
 701                    }
 702                    block_on(diagnostics_tx.send(LspEvent::DiagnosticsUpdate(params))).ok();
 703                    if !has_disk_based_diagnostic_progress_token {
 704                        block_on(diagnostics_tx.send(LspEvent::DiagnosticsFinish)).ok();
 705                    }
 706                }
 707            })
 708            .detach();
 709
 710        // Listen for `Progress` notifications. Send an event when the language server
 711        // transitions between running jobs and not running any jobs.
 712        let mut running_jobs_for_this_server: i32 = 0;
 713        language_server
 714            .on_notification::<lsp::notification::Progress, _>(move |params| {
 715                let token = match params.token {
 716                    lsp::NumberOrString::Number(_) => None,
 717                    lsp::NumberOrString::String(token) => Some(token),
 718                };
 719
 720                if token == disk_based_diagnostics_progress_token {
 721                    match params.value {
 722                        lsp::ProgressParamsValue::WorkDone(progress) => match progress {
 723                            lsp::WorkDoneProgress::Begin(_) => {
 724                                running_jobs_for_this_server += 1;
 725                                if running_jobs_for_this_server == 1 {
 726                                    block_on(diagnostics_tx.send(LspEvent::DiagnosticsStart)).ok();
 727                                }
 728                            }
 729                            lsp::WorkDoneProgress::End(_) => {
 730                                running_jobs_for_this_server -= 1;
 731                                if running_jobs_for_this_server == 0 {
 732                                    block_on(diagnostics_tx.send(LspEvent::DiagnosticsFinish)).ok();
 733                                }
 734                            }
 735                            _ => {}
 736                        },
 737                    }
 738                }
 739            })
 740            .detach();
 741
 742        // Process all the LSP events.
 743        cx.spawn_weak(|this, mut cx| async move {
 744            while let Ok(message) = diagnostics_rx.recv().await {
 745                let this = cx.read(|cx| this.upgrade(cx))?;
 746                match message {
 747                    LspEvent::DiagnosticsStart => {
 748                        let send = this.update(&mut cx, |this, cx| {
 749                            this.disk_based_diagnostics_started(cx);
 750                            this.remote_id().map(|project_id| {
 751                                rpc.send(proto::DiskBasedDiagnosticsUpdating { project_id })
 752                            })
 753                        });
 754                        if let Some(send) = send {
 755                            send.await.log_err();
 756                        }
 757                    }
 758                    LspEvent::DiagnosticsUpdate(params) => {
 759                        this.update(&mut cx, |this, cx| {
 760                            this.update_diagnostics(params, &disk_based_sources, cx)
 761                                .log_err();
 762                        });
 763                    }
 764                    LspEvent::DiagnosticsFinish => {
 765                        let send = this.update(&mut cx, |this, cx| {
 766                            this.disk_based_diagnostics_finished(cx);
 767                            this.remote_id().map(|project_id| {
 768                                rpc.send(proto::DiskBasedDiagnosticsUpdated { project_id })
 769                            })
 770                        });
 771                        if let Some(send) = send {
 772                            send.await.log_err();
 773                        }
 774                    }
 775                }
 776            }
 777            Some(())
 778        })
 779        .detach();
 780
 781        Some(language_server)
 782    }
 783
 784    pub fn update_diagnostics(
 785        &mut self,
 786        params: lsp::PublishDiagnosticsParams,
 787        disk_based_sources: &HashSet<String>,
 788        cx: &mut ModelContext<Self>,
 789    ) -> Result<()> {
 790        let path = params
 791            .uri
 792            .to_file_path()
 793            .map_err(|_| anyhow!("URI is not a file"))?;
 794        let (worktree, relative_path) = self
 795            .find_worktree_for_abs_path(&path, cx)
 796            .ok_or_else(|| anyhow!("no worktree found for diagnostics"))?;
 797        let project_path = ProjectPath {
 798            worktree_id: worktree.read(cx).id(),
 799            path: relative_path.into(),
 800        };
 801        let mut next_group_id = 0;
 802        let mut diagnostics = Vec::default();
 803        let mut primary_diagnostic_group_ids = HashMap::default();
 804        let mut sources_by_group_id = HashMap::default();
 805        let mut supporting_diagnostic_severities = HashMap::default();
 806        for diagnostic in &params.diagnostics {
 807            let source = diagnostic.source.as_ref();
 808            let code = diagnostic.code.as_ref().map(|code| match code {
 809                lsp::NumberOrString::Number(code) => code.to_string(),
 810                lsp::NumberOrString::String(code) => code.clone(),
 811            });
 812            let range = range_from_lsp(diagnostic.range);
 813            let is_supporting = diagnostic
 814                .related_information
 815                .as_ref()
 816                .map_or(false, |infos| {
 817                    infos.iter().any(|info| {
 818                        primary_diagnostic_group_ids.contains_key(&(
 819                            source,
 820                            code.clone(),
 821                            range_from_lsp(info.location.range),
 822                        ))
 823                    })
 824                });
 825
 826            if is_supporting {
 827                if let Some(severity) = diagnostic.severity {
 828                    supporting_diagnostic_severities
 829                        .insert((source, code.clone(), range), severity);
 830                }
 831            } else {
 832                let group_id = post_inc(&mut next_group_id);
 833                let is_disk_based =
 834                    source.map_or(false, |source| disk_based_sources.contains(source));
 835
 836                sources_by_group_id.insert(group_id, source);
 837                primary_diagnostic_group_ids
 838                    .insert((source, code.clone(), range.clone()), group_id);
 839
 840                diagnostics.push(DiagnosticEntry {
 841                    range,
 842                    diagnostic: Diagnostic {
 843                        code: code.clone(),
 844                        severity: diagnostic.severity.unwrap_or(DiagnosticSeverity::ERROR),
 845                        message: diagnostic.message.clone(),
 846                        group_id,
 847                        is_primary: true,
 848                        is_valid: true,
 849                        is_disk_based,
 850                    },
 851                });
 852                if let Some(infos) = &diagnostic.related_information {
 853                    for info in infos {
 854                        if info.location.uri == params.uri {
 855                            let range = range_from_lsp(info.location.range);
 856                            diagnostics.push(DiagnosticEntry {
 857                                range,
 858                                diagnostic: Diagnostic {
 859                                    code: code.clone(),
 860                                    severity: DiagnosticSeverity::INFORMATION,
 861                                    message: info.message.clone(),
 862                                    group_id,
 863                                    is_primary: false,
 864                                    is_valid: true,
 865                                    is_disk_based,
 866                                },
 867                            });
 868                        }
 869                    }
 870                }
 871            }
 872        }
 873
 874        for entry in &mut diagnostics {
 875            let diagnostic = &mut entry.diagnostic;
 876            if !diagnostic.is_primary {
 877                let source = *sources_by_group_id.get(&diagnostic.group_id).unwrap();
 878                if let Some(&severity) = supporting_diagnostic_severities.get(&(
 879                    source,
 880                    diagnostic.code.clone(),
 881                    entry.range.clone(),
 882                )) {
 883                    diagnostic.severity = severity;
 884                }
 885            }
 886        }
 887
 888        for buffer in self.open_buffers.values() {
 889            if let Some(buffer) = buffer.upgrade(cx) {
 890                if buffer
 891                    .read(cx)
 892                    .file()
 893                    .map_or(false, |file| *file.path() == project_path.path)
 894                {
 895                    buffer.update(cx, |buffer, cx| {
 896                        buffer.update_diagnostics(params.version, diagnostics.clone(), cx)
 897                    })?;
 898                    break;
 899                }
 900            }
 901        }
 902
 903        worktree.update(cx, |worktree, cx| {
 904            worktree
 905                .as_local_mut()
 906                .ok_or_else(|| anyhow!("not a local worktree"))?
 907                .update_diagnostics(project_path.path.clone(), diagnostics, cx)
 908        })?;
 909        cx.emit(Event::DiagnosticsUpdated(project_path));
 910        Ok(())
 911    }
 912
 913    pub fn definition<T: ToOffset>(
 914        &self,
 915        source_buffer_handle: &ModelHandle<Buffer>,
 916        position: T,
 917        cx: &mut ModelContext<Self>,
 918    ) -> Task<Result<Vec<Definition>>> {
 919        let source_buffer_handle = source_buffer_handle.clone();
 920        let buffer = source_buffer_handle.read(cx);
 921        let worktree;
 922        let buffer_abs_path;
 923        if let Some(file) = File::from_dyn(buffer.file()) {
 924            worktree = file.worktree.clone();
 925            buffer_abs_path = file.abs_path();
 926        } else {
 927            return Task::ready(Err(anyhow!("buffer does not belong to any worktree")));
 928        };
 929
 930        if worktree.read(cx).as_local().is_some() {
 931            let point = buffer.offset_to_point_utf16(position.to_offset(buffer));
 932            let buffer_abs_path = buffer_abs_path.unwrap();
 933            let lang_name;
 934            let lang_server;
 935            if let Some(lang) = buffer.language() {
 936                lang_name = lang.name().to_string();
 937                if let Some(server) = self
 938                    .language_servers
 939                    .get(&(worktree.read(cx).id(), lang_name.clone()))
 940                {
 941                    lang_server = server.clone();
 942                } else {
 943                    return Task::ready(Err(anyhow!("buffer does not have a language server")));
 944                };
 945            } else {
 946                return Task::ready(Err(anyhow!("buffer does not have a language")));
 947            }
 948
 949            cx.spawn(|this, mut cx| async move {
 950                let response = lang_server
 951                    .request::<lsp::request::GotoDefinition>(lsp::GotoDefinitionParams {
 952                        text_document_position_params: lsp::TextDocumentPositionParams {
 953                            text_document: lsp::TextDocumentIdentifier::new(
 954                                lsp::Url::from_file_path(&buffer_abs_path).unwrap(),
 955                            ),
 956                            position: lsp::Position::new(point.row, point.column),
 957                        },
 958                        work_done_progress_params: Default::default(),
 959                        partial_result_params: Default::default(),
 960                    })
 961                    .await?;
 962
 963                let mut definitions = Vec::new();
 964                if let Some(response) = response {
 965                    let mut unresolved_locations = Vec::new();
 966                    match response {
 967                        lsp::GotoDefinitionResponse::Scalar(loc) => {
 968                            unresolved_locations.push((loc.uri, loc.range));
 969                        }
 970                        lsp::GotoDefinitionResponse::Array(locs) => {
 971                            unresolved_locations.extend(locs.into_iter().map(|l| (l.uri, l.range)));
 972                        }
 973                        lsp::GotoDefinitionResponse::Link(links) => {
 974                            unresolved_locations.extend(
 975                                links
 976                                    .into_iter()
 977                                    .map(|l| (l.target_uri, l.target_selection_range)),
 978                            );
 979                        }
 980                    }
 981
 982                    for (target_uri, target_range) in unresolved_locations {
 983                        let abs_path = target_uri
 984                            .to_file_path()
 985                            .map_err(|_| anyhow!("invalid target path"))?;
 986
 987                        let (worktree, relative_path) = if let Some(result) = this
 988                            .read_with(&cx, |this, cx| {
 989                                this.find_worktree_for_abs_path(&abs_path, cx)
 990                            }) {
 991                            result
 992                        } else {
 993                            let (worktree, relative_path) = this
 994                                .update(&mut cx, |this, cx| {
 995                                    this.create_worktree_for_abs_path(&abs_path, true, cx)
 996                                })
 997                                .await?;
 998                            this.update(&mut cx, |this, cx| {
 999                                this.language_servers.insert(
1000                                    (worktree.read(cx).id(), lang_name.clone()),
1001                                    lang_server.clone(),
1002                                );
1003                            });
1004                            (worktree, relative_path)
1005                        };
1006
1007                        let project_path = ProjectPath {
1008                            worktree_id: worktree.read_with(&cx, |worktree, _| worktree.id()),
1009                            path: relative_path.into(),
1010                        };
1011                        let target_buffer_handle = this
1012                            .update(&mut cx, |this, cx| this.open_buffer(project_path, cx))
1013                            .await?;
1014                        cx.read(|cx| {
1015                            let target_buffer = target_buffer_handle.read(cx);
1016                            let target_start = target_buffer
1017                                .clip_point_utf16(target_range.start.to_point_utf16(), Bias::Left);
1018                            let target_end = target_buffer
1019                                .clip_point_utf16(target_range.end.to_point_utf16(), Bias::Left);
1020                            definitions.push(Definition {
1021                                target_buffer: target_buffer_handle,
1022                                target_range: target_buffer.anchor_after(target_start)
1023                                    ..target_buffer.anchor_before(target_end),
1024                            });
1025                        });
1026                    }
1027                }
1028
1029                Ok(definitions)
1030            })
1031        } else {
1032            log::info!("go to definition is not yet implemented for guests");
1033            Task::ready(Ok(Default::default()))
1034        }
1035    }
1036
1037    pub fn find_or_create_worktree_for_abs_path(
1038        &self,
1039        abs_path: impl AsRef<Path>,
1040        weak: bool,
1041        cx: &mut ModelContext<Self>,
1042    ) -> Task<Result<(ModelHandle<Worktree>, PathBuf)>> {
1043        let abs_path = abs_path.as_ref();
1044        if let Some((tree, relative_path)) = self.find_worktree_for_abs_path(abs_path, cx) {
1045            Task::ready(Ok((tree.clone(), relative_path.into())))
1046        } else {
1047            self.create_worktree_for_abs_path(abs_path, weak, cx)
1048        }
1049    }
1050
1051    fn create_worktree_for_abs_path(
1052        &self,
1053        abs_path: &Path,
1054        weak: bool,
1055        cx: &mut ModelContext<Self>,
1056    ) -> Task<Result<(ModelHandle<Worktree>, PathBuf)>> {
1057        let worktree = self.add_local_worktree(abs_path, weak, cx);
1058        cx.background().spawn(async move {
1059            let worktree = worktree.await?;
1060            Ok((worktree, PathBuf::new()))
1061        })
1062    }
1063
1064    fn find_worktree_for_abs_path(
1065        &self,
1066        abs_path: &Path,
1067        cx: &AppContext,
1068    ) -> Option<(ModelHandle<Worktree>, PathBuf)> {
1069        for tree in self.worktrees(cx) {
1070            if let Some(relative_path) = tree
1071                .read(cx)
1072                .as_local()
1073                .and_then(|t| abs_path.strip_prefix(t.abs_path()).ok())
1074            {
1075                return Some((tree.clone(), relative_path.into()));
1076            }
1077        }
1078        None
1079    }
1080
1081    pub fn is_shared(&self) -> bool {
1082        match &self.client_state {
1083            ProjectClientState::Local { is_shared, .. } => *is_shared,
1084            ProjectClientState::Remote { .. } => false,
1085        }
1086    }
1087
1088    pub fn add_local_worktree(
1089        &self,
1090        abs_path: impl AsRef<Path>,
1091        weak: bool,
1092        cx: &mut ModelContext<Self>,
1093    ) -> Task<Result<ModelHandle<Worktree>>> {
1094        let fs = self.fs.clone();
1095        let client = self.client.clone();
1096        let path = Arc::from(abs_path.as_ref());
1097        cx.spawn(|project, mut cx| async move {
1098            let worktree = Worktree::local(client.clone(), path, weak, fs, &mut cx).await?;
1099
1100            let (remote_project_id, is_shared) = project.update(&mut cx, |project, cx| {
1101                project.add_worktree(&worktree, cx);
1102                (project.remote_id(), project.is_shared())
1103            });
1104
1105            if let Some(project_id) = remote_project_id {
1106                worktree
1107                    .update(&mut cx, |worktree, cx| {
1108                        worktree.as_local_mut().unwrap().register(project_id, cx)
1109                    })
1110                    .await?;
1111                if is_shared {
1112                    worktree
1113                        .update(&mut cx, |worktree, cx| {
1114                            worktree.as_local_mut().unwrap().share(project_id, cx)
1115                        })
1116                        .await?;
1117                }
1118            }
1119
1120            Ok(worktree)
1121        })
1122    }
1123
1124    pub fn remove_worktree(&mut self, id: WorktreeId, cx: &mut ModelContext<Self>) {
1125        self.worktrees.retain(|worktree| {
1126            worktree
1127                .upgrade(cx)
1128                .map_or(false, |w| w.read(cx).id() != id)
1129        });
1130        cx.notify();
1131    }
1132
1133    fn add_worktree(&mut self, worktree: &ModelHandle<Worktree>, cx: &mut ModelContext<Self>) {
1134        cx.observe(&worktree, |_, _, cx| cx.notify()).detach();
1135        cx.subscribe(&worktree, |this, worktree, _, cx| {
1136            this.update_open_buffers(worktree, cx)
1137        })
1138        .detach();
1139
1140        let push_weak_handle = {
1141            let worktree = worktree.read(cx);
1142            worktree.is_local() && worktree.is_weak()
1143        };
1144        if push_weak_handle {
1145            cx.observe_release(&worktree, |this, cx| {
1146                this.worktrees
1147                    .retain(|worktree| worktree.upgrade(cx).is_some());
1148                cx.notify();
1149            })
1150            .detach();
1151            self.worktrees
1152                .push(WorktreeHandle::Weak(worktree.downgrade()));
1153        } else {
1154            self.worktrees
1155                .push(WorktreeHandle::Strong(worktree.clone()));
1156        }
1157        cx.notify();
1158    }
1159
1160    fn update_open_buffers(
1161        &mut self,
1162        worktree_handle: ModelHandle<Worktree>,
1163        cx: &mut ModelContext<Self>,
1164    ) {
1165        let local = worktree_handle.read(cx).is_local();
1166        let snapshot = worktree_handle.read(cx).snapshot();
1167        let worktree_path = snapshot.abs_path();
1168        let mut buffers_to_delete = Vec::new();
1169        for (buffer_id, buffer) in &self.open_buffers {
1170            if let OpenBuffer::Loaded(buffer) = buffer {
1171                if let Some(buffer) = buffer.upgrade(cx) {
1172                    buffer.update(cx, |buffer, cx| {
1173                        if let Some(old_file) = File::from_dyn(buffer.file()) {
1174                            if old_file.worktree != worktree_handle {
1175                                return;
1176                            }
1177
1178                            let new_file = if let Some(entry) = old_file
1179                                .entry_id
1180                                .and_then(|entry_id| snapshot.entry_for_id(entry_id))
1181                            {
1182                                File {
1183                                    is_local: local,
1184                                    worktree_path: worktree_path.clone(),
1185                                    entry_id: Some(entry.id),
1186                                    mtime: entry.mtime,
1187                                    path: entry.path.clone(),
1188                                    worktree: worktree_handle.clone(),
1189                                }
1190                            } else if let Some(entry) =
1191                                snapshot.entry_for_path(old_file.path().as_ref())
1192                            {
1193                                File {
1194                                    is_local: local,
1195                                    worktree_path: worktree_path.clone(),
1196                                    entry_id: Some(entry.id),
1197                                    mtime: entry.mtime,
1198                                    path: entry.path.clone(),
1199                                    worktree: worktree_handle.clone(),
1200                                }
1201                            } else {
1202                                File {
1203                                    is_local: local,
1204                                    worktree_path: worktree_path.clone(),
1205                                    entry_id: None,
1206                                    path: old_file.path().clone(),
1207                                    mtime: old_file.mtime(),
1208                                    worktree: worktree_handle.clone(),
1209                                }
1210                            };
1211
1212                            if let Some(task) = buffer.file_updated(Box::new(new_file), cx) {
1213                                task.detach();
1214                            }
1215                        }
1216                    });
1217                } else {
1218                    buffers_to_delete.push(*buffer_id);
1219                }
1220            }
1221        }
1222
1223        for buffer_id in buffers_to_delete {
1224            self.open_buffers.remove(&buffer_id);
1225        }
1226    }
1227
1228    pub fn set_active_path(&mut self, entry: Option<ProjectPath>, cx: &mut ModelContext<Self>) {
1229        let new_active_entry = entry.and_then(|project_path| {
1230            let worktree = self.worktree_for_id(project_path.worktree_id, cx)?;
1231            let entry = worktree.read(cx).entry_for_path(project_path.path)?;
1232            Some(ProjectEntry {
1233                worktree_id: project_path.worktree_id,
1234                entry_id: entry.id,
1235            })
1236        });
1237        if new_active_entry != self.active_entry {
1238            self.active_entry = new_active_entry;
1239            cx.emit(Event::ActiveEntryChanged(new_active_entry));
1240        }
1241    }
1242
1243    pub fn is_running_disk_based_diagnostics(&self) -> bool {
1244        self.language_servers_with_diagnostics_running > 0
1245    }
1246
1247    pub fn diagnostic_summary(&self, cx: &AppContext) -> DiagnosticSummary {
1248        let mut summary = DiagnosticSummary::default();
1249        for (_, path_summary) in self.diagnostic_summaries(cx) {
1250            summary.error_count += path_summary.error_count;
1251            summary.warning_count += path_summary.warning_count;
1252            summary.info_count += path_summary.info_count;
1253            summary.hint_count += path_summary.hint_count;
1254        }
1255        summary
1256    }
1257
1258    pub fn diagnostic_summaries<'a>(
1259        &'a self,
1260        cx: &'a AppContext,
1261    ) -> impl Iterator<Item = (ProjectPath, DiagnosticSummary)> + 'a {
1262        self.worktrees(cx).flat_map(move |worktree| {
1263            let worktree = worktree.read(cx);
1264            let worktree_id = worktree.id();
1265            worktree
1266                .diagnostic_summaries()
1267                .map(move |(path, summary)| (ProjectPath { worktree_id, path }, summary))
1268        })
1269    }
1270
1271    fn disk_based_diagnostics_started(&mut self, cx: &mut ModelContext<Self>) {
1272        self.language_servers_with_diagnostics_running += 1;
1273        if self.language_servers_with_diagnostics_running == 1 {
1274            cx.emit(Event::DiskBasedDiagnosticsStarted);
1275        }
1276    }
1277
1278    fn disk_based_diagnostics_finished(&mut self, cx: &mut ModelContext<Self>) {
1279        cx.emit(Event::DiskBasedDiagnosticsUpdated);
1280        self.language_servers_with_diagnostics_running -= 1;
1281        if self.language_servers_with_diagnostics_running == 0 {
1282            cx.emit(Event::DiskBasedDiagnosticsFinished);
1283        }
1284    }
1285
1286    pub fn active_entry(&self) -> Option<ProjectEntry> {
1287        self.active_entry
1288    }
1289
1290    // RPC message handlers
1291
1292    fn handle_unshare_project(
1293        &mut self,
1294        _: TypedEnvelope<proto::UnshareProject>,
1295        _: Arc<Client>,
1296        cx: &mut ModelContext<Self>,
1297    ) -> Result<()> {
1298        if let ProjectClientState::Remote {
1299            sharing_has_stopped,
1300            ..
1301        } = &mut self.client_state
1302        {
1303            *sharing_has_stopped = true;
1304            self.collaborators.clear();
1305            cx.notify();
1306            Ok(())
1307        } else {
1308            unreachable!()
1309        }
1310    }
1311
1312    fn handle_add_collaborator(
1313        &mut self,
1314        mut envelope: TypedEnvelope<proto::AddProjectCollaborator>,
1315        _: Arc<Client>,
1316        cx: &mut ModelContext<Self>,
1317    ) -> Result<()> {
1318        let user_store = self.user_store.clone();
1319        let collaborator = envelope
1320            .payload
1321            .collaborator
1322            .take()
1323            .ok_or_else(|| anyhow!("empty collaborator"))?;
1324
1325        cx.spawn(|this, mut cx| {
1326            async move {
1327                let collaborator =
1328                    Collaborator::from_proto(collaborator, &user_store, &mut cx).await?;
1329                this.update(&mut cx, |this, cx| {
1330                    this.collaborators
1331                        .insert(collaborator.peer_id, collaborator);
1332                    cx.notify();
1333                });
1334                Ok(())
1335            }
1336            .log_err()
1337        })
1338        .detach();
1339
1340        Ok(())
1341    }
1342
1343    fn handle_remove_collaborator(
1344        &mut self,
1345        envelope: TypedEnvelope<proto::RemoveProjectCollaborator>,
1346        _: Arc<Client>,
1347        cx: &mut ModelContext<Self>,
1348    ) -> Result<()> {
1349        let peer_id = PeerId(envelope.payload.peer_id);
1350        let replica_id = self
1351            .collaborators
1352            .remove(&peer_id)
1353            .ok_or_else(|| anyhow!("unknown peer {:?}", peer_id))?
1354            .replica_id;
1355        self.shared_buffers.remove(&peer_id);
1356        for (_, buffer) in &self.open_buffers {
1357            if let OpenBuffer::Loaded(buffer) = buffer {
1358                if let Some(buffer) = buffer.upgrade(cx) {
1359                    buffer.update(cx, |buffer, cx| buffer.remove_peer(replica_id, cx));
1360                }
1361            }
1362        }
1363        cx.notify();
1364        Ok(())
1365    }
1366
1367    fn handle_share_worktree(
1368        &mut self,
1369        envelope: TypedEnvelope<proto::ShareWorktree>,
1370        client: Arc<Client>,
1371        cx: &mut ModelContext<Self>,
1372    ) -> Result<()> {
1373        let remote_id = self.remote_id().ok_or_else(|| anyhow!("invalid project"))?;
1374        let replica_id = self.replica_id();
1375        let worktree = envelope
1376            .payload
1377            .worktree
1378            .ok_or_else(|| anyhow!("invalid worktree"))?;
1379        cx.spawn(|this, mut cx| {
1380            async move {
1381                let worktree =
1382                    Worktree::remote(remote_id, replica_id, worktree, client, &mut cx).await?;
1383                this.update(&mut cx, |this, cx| this.add_worktree(&worktree, cx));
1384                Ok(())
1385            }
1386            .log_err()
1387        })
1388        .detach();
1389        Ok(())
1390    }
1391
1392    fn handle_unregister_worktree(
1393        &mut self,
1394        envelope: TypedEnvelope<proto::UnregisterWorktree>,
1395        _: Arc<Client>,
1396        cx: &mut ModelContext<Self>,
1397    ) -> Result<()> {
1398        let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
1399        self.remove_worktree(worktree_id, cx);
1400        Ok(())
1401    }
1402
1403    fn handle_update_worktree(
1404        &mut self,
1405        envelope: TypedEnvelope<proto::UpdateWorktree>,
1406        _: Arc<Client>,
1407        cx: &mut ModelContext<Self>,
1408    ) -> Result<()> {
1409        let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
1410        if let Some(worktree) = self.worktree_for_id(worktree_id, cx) {
1411            worktree.update(cx, |worktree, cx| {
1412                let worktree = worktree.as_remote_mut().unwrap();
1413                worktree.update_from_remote(envelope, cx)
1414            })?;
1415        }
1416        Ok(())
1417    }
1418
1419    fn handle_update_diagnostic_summary(
1420        &mut self,
1421        envelope: TypedEnvelope<proto::UpdateDiagnosticSummary>,
1422        _: Arc<Client>,
1423        cx: &mut ModelContext<Self>,
1424    ) -> Result<()> {
1425        let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
1426        if let Some(worktree) = self.worktree_for_id(worktree_id, cx) {
1427            if let Some(summary) = envelope.payload.summary {
1428                let project_path = ProjectPath {
1429                    worktree_id,
1430                    path: Path::new(&summary.path).into(),
1431                };
1432                worktree.update(cx, |worktree, _| {
1433                    worktree
1434                        .as_remote_mut()
1435                        .unwrap()
1436                        .update_diagnostic_summary(project_path.path.clone(), &summary);
1437                });
1438                cx.emit(Event::DiagnosticsUpdated(project_path));
1439            }
1440        }
1441        Ok(())
1442    }
1443
1444    fn handle_disk_based_diagnostics_updating(
1445        &mut self,
1446        _: TypedEnvelope<proto::DiskBasedDiagnosticsUpdating>,
1447        _: Arc<Client>,
1448        cx: &mut ModelContext<Self>,
1449    ) -> Result<()> {
1450        self.disk_based_diagnostics_started(cx);
1451        Ok(())
1452    }
1453
1454    fn handle_disk_based_diagnostics_updated(
1455        &mut self,
1456        _: TypedEnvelope<proto::DiskBasedDiagnosticsUpdated>,
1457        _: Arc<Client>,
1458        cx: &mut ModelContext<Self>,
1459    ) -> Result<()> {
1460        self.disk_based_diagnostics_finished(cx);
1461        Ok(())
1462    }
1463
1464    pub fn handle_update_buffer(
1465        &mut self,
1466        envelope: TypedEnvelope<proto::UpdateBuffer>,
1467        _: Arc<Client>,
1468        cx: &mut ModelContext<Self>,
1469    ) -> Result<()> {
1470        let payload = envelope.payload.clone();
1471        let buffer_id = payload.buffer_id as usize;
1472        let ops = payload
1473            .operations
1474            .into_iter()
1475            .map(|op| language::proto::deserialize_operation(op))
1476            .collect::<Result<Vec<_>, _>>()?;
1477        match self.open_buffers.get_mut(&buffer_id) {
1478            Some(OpenBuffer::Operations(pending_ops)) => pending_ops.extend(ops),
1479            Some(OpenBuffer::Loaded(buffer)) => {
1480                if let Some(buffer) = buffer.upgrade(cx) {
1481                    buffer.update(cx, |buffer, cx| buffer.apply_ops(ops, cx))?;
1482                } else {
1483                    self.open_buffers
1484                        .insert(buffer_id, OpenBuffer::Operations(ops));
1485                }
1486            }
1487            None => {
1488                self.open_buffers
1489                    .insert(buffer_id, OpenBuffer::Operations(ops));
1490            }
1491        }
1492        Ok(())
1493    }
1494
1495    pub fn handle_save_buffer(
1496        &mut self,
1497        envelope: TypedEnvelope<proto::SaveBuffer>,
1498        rpc: Arc<Client>,
1499        cx: &mut ModelContext<Self>,
1500    ) -> Result<()> {
1501        let sender_id = envelope.original_sender_id()?;
1502        let project_id = self.remote_id().ok_or_else(|| anyhow!("not connected"))?;
1503        let buffer = self
1504            .shared_buffers
1505            .get(&sender_id)
1506            .and_then(|shared_buffers| shared_buffers.get(&envelope.payload.buffer_id).cloned())
1507            .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))?;
1508        let receipt = envelope.receipt();
1509        let buffer_id = envelope.payload.buffer_id;
1510        let save = cx.spawn(|_, mut cx| async move {
1511            buffer.update(&mut cx, |buffer, cx| buffer.save(cx)).await
1512        });
1513
1514        cx.background()
1515            .spawn(
1516                async move {
1517                    let (version, mtime) = save.await?;
1518
1519                    rpc.respond(
1520                        receipt,
1521                        proto::BufferSaved {
1522                            project_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}