1mod ignore;
   2mod lsp_command;
   3pub mod search;
   4pub mod worktree;
   5
   6#[cfg(test)]
   7mod project_tests;
   8
   9use anyhow::{anyhow, Context, Result};
  10use client::{proto, Client, TypedEnvelope, UserStore};
  11use clock::ReplicaId;
  12use collections::{hash_map, BTreeMap, HashMap, HashSet};
  13use futures::{
  14    channel::{mpsc, oneshot},
  15    future::Shared,
  16    AsyncWriteExt, Future, FutureExt, StreamExt, TryFutureExt,
  17};
  18use gpui::{
  19    AnyModelHandle, AppContext, AsyncAppContext, Entity, ModelContext, ModelHandle,
  20    MutableAppContext, Task, UpgradeModelHandle, WeakModelHandle,
  21};
  22use language::{
  23    point_to_lsp,
  24    proto::{
  25        deserialize_anchor, deserialize_line_ending, deserialize_version, serialize_anchor,
  26        serialize_version,
  27    },
  28    range_from_lsp, range_to_lsp, Anchor, Bias, Buffer, CachedLspAdapter, CharKind, CodeAction,
  29    CodeLabel, Completion, Diagnostic, DiagnosticEntry, DiagnosticSet, Event as BufferEvent,
  30    File as _, Language, LanguageRegistry, LanguageServerName, LocalFile, OffsetRangeExt,
  31    Operation, Patch, PointUtf16, TextBufferSnapshot, ToOffset, ToPointUtf16, Transaction,
  32    Unclipped,
  33};
  34use lsp::{
  35    DiagnosticSeverity, DiagnosticTag, DocumentHighlightKind, LanguageServer, LanguageString,
  36    MarkedString,
  37};
  38use lsp_command::*;
  39use parking_lot::Mutex;
  40use postage::watch;
  41use rand::prelude::*;
  42use search::SearchQuery;
  43use serde::Serialize;
  44use settings::{FormatOnSave, Formatter, Settings};
  45use sha2::{Digest, Sha256};
  46use similar::{ChangeTag, TextDiff};
  47use std::{
  48    cell::RefCell,
  49    cmp::{self, Ordering},
  50    convert::TryInto,
  51    hash::Hash,
  52    mem,
  53    num::NonZeroU32,
  54    ops::Range,
  55    path::{Component, Path, PathBuf},
  56    rc::Rc,
  57    str,
  58    sync::{
  59        atomic::{AtomicUsize, Ordering::SeqCst},
  60        Arc,
  61    },
  62    time::Instant,
  63};
  64use terminal::{Terminal, TerminalBuilder};
  65use thiserror::Error;
  66use util::{defer, post_inc, ResultExt, TryFutureExt as _};
  67
  68pub use fs::*;
  69pub use worktree::*;
  70
  71pub trait Item: Entity {
  72    fn entry_id(&self, cx: &AppContext) -> Option<ProjectEntryId>;
  73}
  74
  75// Language server state is stored across 3 collections:
  76//     language_servers =>
  77//         a mapping from unique server id to LanguageServerState which can either be a task for a
  78//         server in the process of starting, or a running server with adapter and language server arcs
  79//     language_server_ids => a mapping from worktreeId and server name to the unique server id
  80//     language_server_statuses => a mapping from unique server id to the current server status
  81//
  82// Multiple worktrees can map to the same language server for example when you jump to the definition
  83// of a file in the standard library. So language_server_ids is used to look up which server is active
  84// for a given worktree and language server name
  85//
  86// When starting a language server, first the id map is checked to make sure a server isn't already available
  87// for that worktree. If there is one, it finishes early. Otherwise, a new id is allocated and and
  88// the Starting variant of LanguageServerState is stored in the language_servers map.
  89pub struct Project {
  90    worktrees: Vec<WorktreeHandle>,
  91    active_entry: Option<ProjectEntryId>,
  92    languages: Arc<LanguageRegistry>,
  93    language_servers: HashMap<usize, LanguageServerState>,
  94    language_server_ids: HashMap<(WorktreeId, LanguageServerName), usize>,
  95    language_server_statuses: BTreeMap<usize, LanguageServerStatus>,
  96    language_server_settings: Arc<Mutex<serde_json::Value>>,
  97    last_workspace_edits_by_language_server: HashMap<usize, ProjectTransaction>,
  98    next_language_server_id: usize,
  99    client: Arc<client::Client>,
 100    next_entry_id: Arc<AtomicUsize>,
 101    next_diagnostic_group_id: usize,
 102    user_store: ModelHandle<UserStore>,
 103    fs: Arc<dyn Fs>,
 104    client_state: Option<ProjectClientState>,
 105    collaborators: HashMap<proto::PeerId, Collaborator>,
 106    client_subscriptions: Vec<client::Subscription>,
 107    _subscriptions: Vec<gpui::Subscription>,
 108    opened_buffer: (watch::Sender<()>, watch::Receiver<()>),
 109    shared_buffers: HashMap<proto::PeerId, HashSet<u64>>,
 110    #[allow(clippy::type_complexity)]
 111    loading_buffers: HashMap<
 112        ProjectPath,
 113        postage::watch::Receiver<Option<Result<ModelHandle<Buffer>, Arc<anyhow::Error>>>>,
 114    >,
 115    #[allow(clippy::type_complexity)]
 116    loading_local_worktrees:
 117        HashMap<Arc<Path>, Shared<Task<Result<ModelHandle<Worktree>, Arc<anyhow::Error>>>>>,
 118    opened_buffers: HashMap<u64, OpenBuffer>,
 119    incomplete_buffers: HashMap<u64, ModelHandle<Buffer>>,
 120    buffer_snapshots: HashMap<u64, Vec<(i32, TextBufferSnapshot)>>,
 121    buffers_being_formatted: HashSet<usize>,
 122    nonce: u128,
 123    _maintain_buffer_languages: Task<()>,
 124}
 125
 126#[derive(Error, Debug)]
 127pub enum JoinProjectError {
 128    #[error("host declined join request")]
 129    HostDeclined,
 130    #[error("host closed the project")]
 131    HostClosedProject,
 132    #[error("host went offline")]
 133    HostWentOffline,
 134    #[error("{0}")]
 135    Other(#[from] anyhow::Error),
 136}
 137
 138enum OpenBuffer {
 139    Strong(ModelHandle<Buffer>),
 140    Weak(WeakModelHandle<Buffer>),
 141    Operations(Vec<Operation>),
 142}
 143
 144enum WorktreeHandle {
 145    Strong(ModelHandle<Worktree>),
 146    Weak(WeakModelHandle<Worktree>),
 147}
 148
 149enum ProjectClientState {
 150    Local {
 151        remote_id: u64,
 152        metadata_changed: mpsc::UnboundedSender<oneshot::Sender<()>>,
 153        _maintain_metadata: Task<()>,
 154    },
 155    Remote {
 156        sharing_has_stopped: bool,
 157        remote_id: u64,
 158        replica_id: ReplicaId,
 159    },
 160}
 161
 162#[derive(Clone, Debug)]
 163pub struct Collaborator {
 164    pub peer_id: proto::PeerId,
 165    pub replica_id: ReplicaId,
 166}
 167
 168#[derive(Clone, Debug, PartialEq, Eq)]
 169pub enum Event {
 170    ActiveEntryChanged(Option<ProjectEntryId>),
 171    WorktreeAdded,
 172    WorktreeRemoved(WorktreeId),
 173    DiskBasedDiagnosticsStarted {
 174        language_server_id: usize,
 175    },
 176    DiskBasedDiagnosticsFinished {
 177        language_server_id: usize,
 178    },
 179    DiagnosticsUpdated {
 180        path: ProjectPath,
 181        language_server_id: usize,
 182    },
 183    RemoteIdChanged(Option<u64>),
 184    DisconnectedFromHost,
 185    CollaboratorUpdated {
 186        old_peer_id: proto::PeerId,
 187        new_peer_id: proto::PeerId,
 188    },
 189    CollaboratorLeft(proto::PeerId),
 190}
 191
 192pub enum LanguageServerState {
 193    Starting(Task<Option<Arc<LanguageServer>>>),
 194    Running {
 195        language: Arc<Language>,
 196        adapter: Arc<CachedLspAdapter>,
 197        server: Arc<LanguageServer>,
 198    },
 199}
 200
 201#[derive(Serialize)]
 202pub struct LanguageServerStatus {
 203    pub name: String,
 204    pub pending_work: BTreeMap<String, LanguageServerProgress>,
 205    pub has_pending_diagnostic_updates: bool,
 206    progress_tokens: HashSet<String>,
 207}
 208
 209#[derive(Clone, Debug, Serialize)]
 210pub struct LanguageServerProgress {
 211    pub message: Option<String>,
 212    pub percentage: Option<usize>,
 213    #[serde(skip_serializing)]
 214    pub last_update_at: Instant,
 215}
 216
 217#[derive(Clone, Debug, Eq, PartialEq, Hash, PartialOrd, Ord)]
 218pub struct ProjectPath {
 219    pub worktree_id: WorktreeId,
 220    pub path: Arc<Path>,
 221}
 222
 223#[derive(Copy, Clone, Debug, Default, PartialEq, Serialize)]
 224pub struct DiagnosticSummary {
 225    pub language_server_id: usize,
 226    pub error_count: usize,
 227    pub warning_count: usize,
 228}
 229
 230#[derive(Debug, Clone)]
 231pub struct Location {
 232    pub buffer: ModelHandle<Buffer>,
 233    pub range: Range<language::Anchor>,
 234}
 235
 236#[derive(Debug, Clone)]
 237pub struct LocationLink {
 238    pub origin: Option<Location>,
 239    pub target: Location,
 240}
 241
 242#[derive(Debug)]
 243pub struct DocumentHighlight {
 244    pub range: Range<language::Anchor>,
 245    pub kind: DocumentHighlightKind,
 246}
 247
 248#[derive(Clone, Debug)]
 249pub struct Symbol {
 250    pub language_server_name: LanguageServerName,
 251    pub source_worktree_id: WorktreeId,
 252    pub path: ProjectPath,
 253    pub label: CodeLabel,
 254    pub name: String,
 255    pub kind: lsp::SymbolKind,
 256    pub range: Range<Unclipped<PointUtf16>>,
 257    pub signature: [u8; 32],
 258}
 259
 260#[derive(Clone, Debug, PartialEq)]
 261pub struct HoverBlock {
 262    pub text: String,
 263    pub language: Option<String>,
 264}
 265
 266impl HoverBlock {
 267    fn try_new(marked_string: MarkedString) -> Option<Self> {
 268        let result = match marked_string {
 269            MarkedString::LanguageString(LanguageString { language, value }) => HoverBlock {
 270                text: value,
 271                language: Some(language),
 272            },
 273            MarkedString::String(text) => HoverBlock {
 274                text,
 275                language: None,
 276            },
 277        };
 278        if result.text.is_empty() {
 279            None
 280        } else {
 281            Some(result)
 282        }
 283    }
 284}
 285
 286#[derive(Debug)]
 287pub struct Hover {
 288    pub contents: Vec<HoverBlock>,
 289    pub range: Option<Range<language::Anchor>>,
 290}
 291
 292#[derive(Default)]
 293pub struct ProjectTransaction(pub HashMap<ModelHandle<Buffer>, language::Transaction>);
 294
 295impl DiagnosticSummary {
 296    fn new<'a, T: 'a>(
 297        language_server_id: usize,
 298        diagnostics: impl IntoIterator<Item = &'a DiagnosticEntry<T>>,
 299    ) -> Self {
 300        let mut this = Self {
 301            language_server_id,
 302            error_count: 0,
 303            warning_count: 0,
 304        };
 305
 306        for entry in diagnostics {
 307            if entry.diagnostic.is_primary {
 308                match entry.diagnostic.severity {
 309                    DiagnosticSeverity::ERROR => this.error_count += 1,
 310                    DiagnosticSeverity::WARNING => this.warning_count += 1,
 311                    _ => {}
 312                }
 313            }
 314        }
 315
 316        this
 317    }
 318
 319    pub fn is_empty(&self) -> bool {
 320        self.error_count == 0 && self.warning_count == 0
 321    }
 322
 323    pub fn to_proto(&self, path: &Path) -> proto::DiagnosticSummary {
 324        proto::DiagnosticSummary {
 325            path: path.to_string_lossy().to_string(),
 326            language_server_id: self.language_server_id as u64,
 327            error_count: self.error_count as u32,
 328            warning_count: self.warning_count as u32,
 329        }
 330    }
 331}
 332
 333#[derive(Clone, Copy, Debug, Default, Hash, PartialEq, Eq, PartialOrd, Ord)]
 334pub struct ProjectEntryId(usize);
 335
 336impl ProjectEntryId {
 337    pub const MAX: Self = Self(usize::MAX);
 338
 339    pub fn new(counter: &AtomicUsize) -> Self {
 340        Self(counter.fetch_add(1, SeqCst))
 341    }
 342
 343    pub fn from_proto(id: u64) -> Self {
 344        Self(id as usize)
 345    }
 346
 347    pub fn to_proto(&self) -> u64 {
 348        self.0 as u64
 349    }
 350
 351    pub fn to_usize(&self) -> usize {
 352        self.0
 353    }
 354}
 355
 356#[derive(Debug, Clone, Copy, PartialEq, Eq)]
 357pub enum FormatTrigger {
 358    Save,
 359    Manual,
 360}
 361
 362impl FormatTrigger {
 363    fn from_proto(value: i32) -> FormatTrigger {
 364        match value {
 365            0 => FormatTrigger::Save,
 366            1 => FormatTrigger::Manual,
 367            _ => FormatTrigger::Save,
 368        }
 369    }
 370}
 371
 372impl Project {
 373    pub fn init(client: &Arc<Client>) {
 374        client.add_model_message_handler(Self::handle_add_collaborator);
 375        client.add_model_message_handler(Self::handle_update_collaborator);
 376        client.add_model_message_handler(Self::handle_remove_collaborator);
 377        client.add_model_message_handler(Self::handle_buffer_reloaded);
 378        client.add_model_message_handler(Self::handle_buffer_saved);
 379        client.add_model_message_handler(Self::handle_start_language_server);
 380        client.add_model_message_handler(Self::handle_update_language_server);
 381        client.add_model_message_handler(Self::handle_update_project);
 382        client.add_model_message_handler(Self::handle_unshare_project);
 383        client.add_model_message_handler(Self::handle_create_buffer_for_peer);
 384        client.add_model_message_handler(Self::handle_update_buffer_file);
 385        client.add_model_message_handler(Self::handle_update_buffer);
 386        client.add_model_message_handler(Self::handle_update_diagnostic_summary);
 387        client.add_model_message_handler(Self::handle_update_worktree);
 388        client.add_model_request_handler(Self::handle_create_project_entry);
 389        client.add_model_request_handler(Self::handle_rename_project_entry);
 390        client.add_model_request_handler(Self::handle_copy_project_entry);
 391        client.add_model_request_handler(Self::handle_delete_project_entry);
 392        client.add_model_request_handler(Self::handle_apply_additional_edits_for_completion);
 393        client.add_model_request_handler(Self::handle_apply_code_action);
 394        client.add_model_request_handler(Self::handle_reload_buffers);
 395        client.add_model_request_handler(Self::handle_format_buffers);
 396        client.add_model_request_handler(Self::handle_get_code_actions);
 397        client.add_model_request_handler(Self::handle_get_completions);
 398        client.add_model_request_handler(Self::handle_lsp_command::<GetHover>);
 399        client.add_model_request_handler(Self::handle_lsp_command::<GetDefinition>);
 400        client.add_model_request_handler(Self::handle_lsp_command::<GetTypeDefinition>);
 401        client.add_model_request_handler(Self::handle_lsp_command::<GetDocumentHighlights>);
 402        client.add_model_request_handler(Self::handle_lsp_command::<GetReferences>);
 403        client.add_model_request_handler(Self::handle_lsp_command::<PrepareRename>);
 404        client.add_model_request_handler(Self::handle_lsp_command::<PerformRename>);
 405        client.add_model_request_handler(Self::handle_search_project);
 406        client.add_model_request_handler(Self::handle_get_project_symbols);
 407        client.add_model_request_handler(Self::handle_open_buffer_for_symbol);
 408        client.add_model_request_handler(Self::handle_open_buffer_by_id);
 409        client.add_model_request_handler(Self::handle_open_buffer_by_path);
 410        client.add_model_request_handler(Self::handle_save_buffer);
 411        client.add_model_message_handler(Self::handle_update_diff_base);
 412    }
 413
 414    pub fn local(
 415        client: Arc<Client>,
 416        user_store: ModelHandle<UserStore>,
 417        languages: Arc<LanguageRegistry>,
 418        fs: Arc<dyn Fs>,
 419        cx: &mut MutableAppContext,
 420    ) -> ModelHandle<Self> {
 421        cx.add_model(|cx: &mut ModelContext<Self>| Self {
 422            worktrees: Default::default(),
 423            collaborators: Default::default(),
 424            opened_buffers: Default::default(),
 425            shared_buffers: Default::default(),
 426            incomplete_buffers: Default::default(),
 427            loading_buffers: Default::default(),
 428            loading_local_worktrees: Default::default(),
 429            buffer_snapshots: Default::default(),
 430            client_state: None,
 431            opened_buffer: watch::channel(),
 432            client_subscriptions: Vec::new(),
 433            _subscriptions: vec![cx.observe_global::<Settings, _>(Self::on_settings_changed)],
 434            _maintain_buffer_languages: Self::maintain_buffer_languages(&languages, cx),
 435            active_entry: None,
 436            languages,
 437            client,
 438            user_store,
 439            fs,
 440            next_entry_id: Default::default(),
 441            next_diagnostic_group_id: Default::default(),
 442            language_servers: Default::default(),
 443            language_server_ids: Default::default(),
 444            language_server_statuses: Default::default(),
 445            last_workspace_edits_by_language_server: Default::default(),
 446            language_server_settings: Default::default(),
 447            buffers_being_formatted: Default::default(),
 448            next_language_server_id: 0,
 449            nonce: StdRng::from_entropy().gen(),
 450        })
 451    }
 452
 453    pub async fn remote(
 454        remote_id: u64,
 455        client: Arc<Client>,
 456        user_store: ModelHandle<UserStore>,
 457        languages: Arc<LanguageRegistry>,
 458        fs: Arc<dyn Fs>,
 459        mut cx: AsyncAppContext,
 460    ) -> Result<ModelHandle<Self>, JoinProjectError> {
 461        client.authenticate_and_connect(true, &cx).await?;
 462
 463        let subscription = client.subscribe_to_entity(remote_id);
 464        let response = client
 465            .request(proto::JoinProject {
 466                project_id: remote_id,
 467            })
 468            .await?;
 469        let this = cx.add_model(|cx| {
 470            let replica_id = response.replica_id as ReplicaId;
 471
 472            let mut worktrees = Vec::new();
 473            for worktree in response.worktrees {
 474                let worktree = cx.update(|cx| {
 475                    Worktree::remote(remote_id, replica_id, worktree, client.clone(), cx)
 476                });
 477                worktrees.push(worktree);
 478            }
 479
 480            let mut this = Self {
 481                worktrees: Vec::new(),
 482                loading_buffers: Default::default(),
 483                opened_buffer: watch::channel(),
 484                shared_buffers: Default::default(),
 485                incomplete_buffers: Default::default(),
 486                loading_local_worktrees: Default::default(),
 487                active_entry: None,
 488                collaborators: Default::default(),
 489                _maintain_buffer_languages: Self::maintain_buffer_languages(&languages, cx),
 490                languages,
 491                user_store: user_store.clone(),
 492                fs,
 493                next_entry_id: Default::default(),
 494                next_diagnostic_group_id: Default::default(),
 495                client_subscriptions: Default::default(),
 496                _subscriptions: Default::default(),
 497                client: client.clone(),
 498                client_state: Some(ProjectClientState::Remote {
 499                    sharing_has_stopped: false,
 500                    remote_id,
 501                    replica_id,
 502                }),
 503                language_servers: Default::default(),
 504                language_server_ids: Default::default(),
 505                language_server_settings: Default::default(),
 506                language_server_statuses: response
 507                    .language_servers
 508                    .into_iter()
 509                    .map(|server| {
 510                        (
 511                            server.id as usize,
 512                            LanguageServerStatus {
 513                                name: server.name,
 514                                pending_work: Default::default(),
 515                                has_pending_diagnostic_updates: false,
 516                                progress_tokens: Default::default(),
 517                            },
 518                        )
 519                    })
 520                    .collect(),
 521                last_workspace_edits_by_language_server: Default::default(),
 522                next_language_server_id: 0,
 523                opened_buffers: Default::default(),
 524                buffers_being_formatted: Default::default(),
 525                buffer_snapshots: Default::default(),
 526                nonce: StdRng::from_entropy().gen(),
 527            };
 528            for worktree in worktrees {
 529                let _ = this.add_worktree(&worktree, cx);
 530            }
 531            this
 532        });
 533        let subscription = subscription.set_model(&this, &mut cx);
 534
 535        let user_ids = response
 536            .collaborators
 537            .iter()
 538            .map(|peer| peer.user_id)
 539            .collect();
 540        user_store
 541            .update(&mut cx, |user_store, cx| user_store.get_users(user_ids, cx))
 542            .await?;
 543
 544        this.update(&mut cx, |this, cx| {
 545            this.set_collaborators_from_proto(response.collaborators, cx)?;
 546            this.client_subscriptions.push(subscription);
 547            anyhow::Ok(())
 548        })?;
 549
 550        Ok(this)
 551    }
 552
 553    #[cfg(any(test, feature = "test-support"))]
 554    pub async fn test(
 555        fs: Arc<dyn Fs>,
 556        root_paths: impl IntoIterator<Item = &Path>,
 557        cx: &mut gpui::TestAppContext,
 558    ) -> ModelHandle<Project> {
 559        if !cx.read(|cx| cx.has_global::<Settings>()) {
 560            cx.update(|cx| {
 561                cx.set_global(Settings::test(cx));
 562                cx.set_global(HomeDir(Path::new("/tmp/").to_path_buf()))
 563            });
 564        }
 565
 566        let languages = Arc::new(LanguageRegistry::test());
 567        let http_client = client::test::FakeHttpClient::with_404_response();
 568        let client = cx.update(|cx| client::Client::new(http_client.clone(), cx));
 569        let user_store = cx.add_model(|cx| UserStore::new(client.clone(), http_client, cx));
 570        let project = cx.update(|cx| Project::local(client, user_store, languages, fs, cx));
 571        for path in root_paths {
 572            let (tree, _) = project
 573                .update(cx, |project, cx| {
 574                    project.find_or_create_local_worktree(path, true, cx)
 575                })
 576                .await
 577                .unwrap();
 578            tree.read_with(cx, |tree, _| tree.as_local().unwrap().scan_complete())
 579                .await;
 580        }
 581        project
 582    }
 583
 584    fn on_settings_changed(&mut self, cx: &mut ModelContext<Self>) {
 585        let settings = cx.global::<Settings>();
 586
 587        let mut language_servers_to_start = Vec::new();
 588        for buffer in self.opened_buffers.values() {
 589            if let Some(buffer) = buffer.upgrade(cx) {
 590                let buffer = buffer.read(cx);
 591                if let Some((file, language)) = File::from_dyn(buffer.file()).zip(buffer.language())
 592                {
 593                    if settings.enable_language_server(Some(&language.name())) {
 594                        let worktree = file.worktree.read(cx);
 595                        language_servers_to_start.push((
 596                            worktree.id(),
 597                            worktree.as_local().unwrap().abs_path().clone(),
 598                            language.clone(),
 599                        ));
 600                    }
 601                }
 602            }
 603        }
 604
 605        let mut language_servers_to_stop = Vec::new();
 606        for language in self.languages.to_vec() {
 607            if let Some(lsp_adapter) = language.lsp_adapter() {
 608                if !settings.enable_language_server(Some(&language.name())) {
 609                    let lsp_name = &lsp_adapter.name;
 610                    for (worktree_id, started_lsp_name) in self.language_server_ids.keys() {
 611                        if lsp_name == started_lsp_name {
 612                            language_servers_to_stop.push((*worktree_id, started_lsp_name.clone()));
 613                        }
 614                    }
 615                }
 616            }
 617        }
 618
 619        // Stop all newly-disabled language servers.
 620        for (worktree_id, adapter_name) in language_servers_to_stop {
 621            self.stop_language_server(worktree_id, adapter_name, cx)
 622                .detach();
 623        }
 624
 625        // Start all the newly-enabled language servers.
 626        for (worktree_id, worktree_path, language) in language_servers_to_start {
 627            self.start_language_server(worktree_id, worktree_path, language, cx);
 628        }
 629
 630        cx.notify();
 631    }
 632
 633    pub fn buffer_for_id(&self, remote_id: u64, cx: &AppContext) -> Option<ModelHandle<Buffer>> {
 634        self.opened_buffers
 635            .get(&remote_id)
 636            .and_then(|buffer| buffer.upgrade(cx))
 637    }
 638
 639    pub fn languages(&self) -> &Arc<LanguageRegistry> {
 640        &self.languages
 641    }
 642
 643    pub fn client(&self) -> Arc<Client> {
 644        self.client.clone()
 645    }
 646
 647    pub fn user_store(&self) -> ModelHandle<UserStore> {
 648        self.user_store.clone()
 649    }
 650
 651    #[cfg(any(test, feature = "test-support"))]
 652    pub fn check_invariants(&self, cx: &AppContext) {
 653        if self.is_local() {
 654            let mut worktree_root_paths = HashMap::default();
 655            for worktree in self.worktrees(cx) {
 656                let worktree = worktree.read(cx);
 657                let abs_path = worktree.as_local().unwrap().abs_path().clone();
 658                let prev_worktree_id = worktree_root_paths.insert(abs_path.clone(), worktree.id());
 659                assert_eq!(
 660                    prev_worktree_id,
 661                    None,
 662                    "abs path {:?} for worktree {:?} is not unique ({:?} was already registered with the same path)",
 663                    abs_path,
 664                    worktree.id(),
 665                    prev_worktree_id
 666                )
 667            }
 668        } else {
 669            let replica_id = self.replica_id();
 670            for buffer in self.opened_buffers.values() {
 671                if let Some(buffer) = buffer.upgrade(cx) {
 672                    let buffer = buffer.read(cx);
 673                    assert_eq!(
 674                        buffer.deferred_ops_len(),
 675                        0,
 676                        "replica {}, buffer {} has deferred operations",
 677                        replica_id,
 678                        buffer.remote_id()
 679                    );
 680                }
 681            }
 682        }
 683    }
 684
 685    #[cfg(any(test, feature = "test-support"))]
 686    pub fn has_open_buffer(&self, path: impl Into<ProjectPath>, cx: &AppContext) -> bool {
 687        let path = path.into();
 688        if let Some(worktree) = self.worktree_for_id(path.worktree_id, cx) {
 689            self.opened_buffers.iter().any(|(_, buffer)| {
 690                if let Some(buffer) = buffer.upgrade(cx) {
 691                    if let Some(file) = File::from_dyn(buffer.read(cx).file()) {
 692                        if file.worktree == worktree && file.path() == &path.path {
 693                            return true;
 694                        }
 695                    }
 696                }
 697                false
 698            })
 699        } else {
 700            false
 701        }
 702    }
 703
 704    pub fn fs(&self) -> &Arc<dyn Fs> {
 705        &self.fs
 706    }
 707
 708    pub fn remote_id(&self) -> Option<u64> {
 709        match self.client_state.as_ref()? {
 710            ProjectClientState::Local { remote_id, .. }
 711            | ProjectClientState::Remote { remote_id, .. } => Some(*remote_id),
 712        }
 713    }
 714
 715    pub fn replica_id(&self) -> ReplicaId {
 716        match &self.client_state {
 717            Some(ProjectClientState::Remote { replica_id, .. }) => *replica_id,
 718            _ => 0,
 719        }
 720    }
 721
 722    fn metadata_changed(&mut self, cx: &mut ModelContext<Self>) -> impl Future<Output = ()> {
 723        let (tx, rx) = oneshot::channel();
 724        if let Some(ProjectClientState::Local {
 725            metadata_changed, ..
 726        }) = &mut self.client_state
 727        {
 728            let _ = metadata_changed.unbounded_send(tx);
 729        }
 730        cx.notify();
 731
 732        async move {
 733            // If the project is shared, this will resolve when the `_maintain_metadata` task has
 734            // a chance to update the metadata. Otherwise, it will resolve right away because `tx`
 735            // will get dropped.
 736            let _ = rx.await;
 737        }
 738    }
 739
 740    pub fn collaborators(&self) -> &HashMap<proto::PeerId, Collaborator> {
 741        &self.collaborators
 742    }
 743
 744    /// Collect all worktrees, including ones that don't appear in the project panel
 745    pub fn worktrees<'a>(
 746        &'a self,
 747        cx: &'a AppContext,
 748    ) -> impl 'a + DoubleEndedIterator<Item = ModelHandle<Worktree>> {
 749        self.worktrees
 750            .iter()
 751            .filter_map(move |worktree| worktree.upgrade(cx))
 752    }
 753
 754    /// Collect all user-visible worktrees, the ones that appear in the project panel
 755    pub fn visible_worktrees<'a>(
 756        &'a self,
 757        cx: &'a AppContext,
 758    ) -> impl 'a + DoubleEndedIterator<Item = ModelHandle<Worktree>> {
 759        self.worktrees.iter().filter_map(|worktree| {
 760            worktree.upgrade(cx).and_then(|worktree| {
 761                if worktree.read(cx).is_visible() {
 762                    Some(worktree)
 763                } else {
 764                    None
 765                }
 766            })
 767        })
 768    }
 769
 770    pub fn worktree_root_names<'a>(&'a self, cx: &'a AppContext) -> impl Iterator<Item = &'a str> {
 771        self.visible_worktrees(cx)
 772            .map(|tree| tree.read(cx).root_name())
 773    }
 774
 775    pub fn worktree_for_id(
 776        &self,
 777        id: WorktreeId,
 778        cx: &AppContext,
 779    ) -> Option<ModelHandle<Worktree>> {
 780        self.worktrees(cx)
 781            .find(|worktree| worktree.read(cx).id() == id)
 782    }
 783
 784    pub fn worktree_for_entry(
 785        &self,
 786        entry_id: ProjectEntryId,
 787        cx: &AppContext,
 788    ) -> Option<ModelHandle<Worktree>> {
 789        self.worktrees(cx)
 790            .find(|worktree| worktree.read(cx).contains_entry(entry_id))
 791    }
 792
 793    pub fn worktree_id_for_entry(
 794        &self,
 795        entry_id: ProjectEntryId,
 796        cx: &AppContext,
 797    ) -> Option<WorktreeId> {
 798        self.worktree_for_entry(entry_id, cx)
 799            .map(|worktree| worktree.read(cx).id())
 800    }
 801
 802    pub fn contains_paths(&self, paths: &[PathBuf], cx: &AppContext) -> bool {
 803        paths.iter().all(|path| self.contains_path(path, cx))
 804    }
 805
 806    pub fn contains_path(&self, path: &Path, cx: &AppContext) -> bool {
 807        for worktree in self.worktrees(cx) {
 808            let worktree = worktree.read(cx).as_local();
 809            if worktree.map_or(false, |w| w.contains_abs_path(path)) {
 810                return true;
 811            }
 812        }
 813        false
 814    }
 815
 816    pub fn create_entry(
 817        &mut self,
 818        project_path: impl Into<ProjectPath>,
 819        is_directory: bool,
 820        cx: &mut ModelContext<Self>,
 821    ) -> Option<Task<Result<Entry>>> {
 822        let project_path = project_path.into();
 823        let worktree = self.worktree_for_id(project_path.worktree_id, cx)?;
 824        if self.is_local() {
 825            Some(worktree.update(cx, |worktree, cx| {
 826                worktree
 827                    .as_local_mut()
 828                    .unwrap()
 829                    .create_entry(project_path.path, is_directory, cx)
 830            }))
 831        } else {
 832            let client = self.client.clone();
 833            let project_id = self.remote_id().unwrap();
 834            Some(cx.spawn_weak(|_, mut cx| async move {
 835                let response = client
 836                    .request(proto::CreateProjectEntry {
 837                        worktree_id: project_path.worktree_id.to_proto(),
 838                        project_id,
 839                        path: project_path.path.to_string_lossy().into(),
 840                        is_directory,
 841                    })
 842                    .await?;
 843                let entry = response
 844                    .entry
 845                    .ok_or_else(|| anyhow!("missing entry in response"))?;
 846                worktree
 847                    .update(&mut cx, |worktree, cx| {
 848                        worktree.as_remote_mut().unwrap().insert_entry(
 849                            entry,
 850                            response.worktree_scan_id as usize,
 851                            cx,
 852                        )
 853                    })
 854                    .await
 855            }))
 856        }
 857    }
 858
 859    pub fn copy_entry(
 860        &mut self,
 861        entry_id: ProjectEntryId,
 862        new_path: impl Into<Arc<Path>>,
 863        cx: &mut ModelContext<Self>,
 864    ) -> Option<Task<Result<Entry>>> {
 865        let worktree = self.worktree_for_entry(entry_id, cx)?;
 866        let new_path = new_path.into();
 867        if self.is_local() {
 868            worktree.update(cx, |worktree, cx| {
 869                worktree
 870                    .as_local_mut()
 871                    .unwrap()
 872                    .copy_entry(entry_id, new_path, cx)
 873            })
 874        } else {
 875            let client = self.client.clone();
 876            let project_id = self.remote_id().unwrap();
 877
 878            Some(cx.spawn_weak(|_, mut cx| async move {
 879                let response = client
 880                    .request(proto::CopyProjectEntry {
 881                        project_id,
 882                        entry_id: entry_id.to_proto(),
 883                        new_path: new_path.to_string_lossy().into(),
 884                    })
 885                    .await?;
 886                let entry = response
 887                    .entry
 888                    .ok_or_else(|| anyhow!("missing entry in response"))?;
 889                worktree
 890                    .update(&mut cx, |worktree, cx| {
 891                        worktree.as_remote_mut().unwrap().insert_entry(
 892                            entry,
 893                            response.worktree_scan_id as usize,
 894                            cx,
 895                        )
 896                    })
 897                    .await
 898            }))
 899        }
 900    }
 901
 902    pub fn rename_entry(
 903        &mut self,
 904        entry_id: ProjectEntryId,
 905        new_path: impl Into<Arc<Path>>,
 906        cx: &mut ModelContext<Self>,
 907    ) -> Option<Task<Result<Entry>>> {
 908        let worktree = self.worktree_for_entry(entry_id, cx)?;
 909        let new_path = new_path.into();
 910        if self.is_local() {
 911            worktree.update(cx, |worktree, cx| {
 912                worktree
 913                    .as_local_mut()
 914                    .unwrap()
 915                    .rename_entry(entry_id, new_path, cx)
 916            })
 917        } else {
 918            let client = self.client.clone();
 919            let project_id = self.remote_id().unwrap();
 920
 921            Some(cx.spawn_weak(|_, mut cx| async move {
 922                let response = client
 923                    .request(proto::RenameProjectEntry {
 924                        project_id,
 925                        entry_id: entry_id.to_proto(),
 926                        new_path: new_path.to_string_lossy().into(),
 927                    })
 928                    .await?;
 929                let entry = response
 930                    .entry
 931                    .ok_or_else(|| anyhow!("missing entry in response"))?;
 932                worktree
 933                    .update(&mut cx, |worktree, cx| {
 934                        worktree.as_remote_mut().unwrap().insert_entry(
 935                            entry,
 936                            response.worktree_scan_id as usize,
 937                            cx,
 938                        )
 939                    })
 940                    .await
 941            }))
 942        }
 943    }
 944
 945    pub fn delete_entry(
 946        &mut self,
 947        entry_id: ProjectEntryId,
 948        cx: &mut ModelContext<Self>,
 949    ) -> Option<Task<Result<()>>> {
 950        let worktree = self.worktree_for_entry(entry_id, cx)?;
 951        if self.is_local() {
 952            worktree.update(cx, |worktree, cx| {
 953                worktree.as_local_mut().unwrap().delete_entry(entry_id, cx)
 954            })
 955        } else {
 956            let client = self.client.clone();
 957            let project_id = self.remote_id().unwrap();
 958            Some(cx.spawn_weak(|_, mut cx| async move {
 959                let response = client
 960                    .request(proto::DeleteProjectEntry {
 961                        project_id,
 962                        entry_id: entry_id.to_proto(),
 963                    })
 964                    .await?;
 965                worktree
 966                    .update(&mut cx, move |worktree, cx| {
 967                        worktree.as_remote_mut().unwrap().delete_entry(
 968                            entry_id,
 969                            response.worktree_scan_id as usize,
 970                            cx,
 971                        )
 972                    })
 973                    .await
 974            }))
 975        }
 976    }
 977
 978    pub fn shared(&mut self, project_id: u64, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
 979        if self.client_state.is_some() {
 980            return Task::ready(Err(anyhow!("project was already shared")));
 981        }
 982
 983        let mut worktree_share_tasks = Vec::new();
 984
 985        for open_buffer in self.opened_buffers.values_mut() {
 986            match open_buffer {
 987                OpenBuffer::Strong(_) => {}
 988                OpenBuffer::Weak(buffer) => {
 989                    if let Some(buffer) = buffer.upgrade(cx) {
 990                        *open_buffer = OpenBuffer::Strong(buffer);
 991                    }
 992                }
 993                OpenBuffer::Operations(_) => unreachable!(),
 994            }
 995        }
 996
 997        for worktree_handle in self.worktrees.iter_mut() {
 998            match worktree_handle {
 999                WorktreeHandle::Strong(_) => {}
1000                WorktreeHandle::Weak(worktree) => {
1001                    if let Some(worktree) = worktree.upgrade(cx) {
1002                        *worktree_handle = WorktreeHandle::Strong(worktree);
1003                    }
1004                }
1005            }
1006        }
1007
1008        for (server_id, status) in &self.language_server_statuses {
1009            self.client
1010                .send(proto::StartLanguageServer {
1011                    project_id,
1012                    server: Some(proto::LanguageServer {
1013                        id: *server_id as u64,
1014                        name: status.name.clone(),
1015                    }),
1016                })
1017                .log_err();
1018        }
1019
1020        for worktree in self.worktrees(cx).collect::<Vec<_>>() {
1021            worktree.update(cx, |worktree, cx| {
1022                let worktree = worktree.as_local_mut().unwrap();
1023                worktree_share_tasks.push(worktree.share(project_id, cx));
1024            });
1025        }
1026
1027        self.client_subscriptions.push(
1028            self.client
1029                .subscribe_to_entity(project_id)
1030                .set_model(&cx.handle(), &mut cx.to_async()),
1031        );
1032        let _ = self.metadata_changed(cx);
1033        cx.emit(Event::RemoteIdChanged(Some(project_id)));
1034        cx.notify();
1035
1036        let (metadata_changed_tx, mut metadata_changed_rx) = mpsc::unbounded();
1037        self.client_state = Some(ProjectClientState::Local {
1038            remote_id: project_id,
1039            metadata_changed: metadata_changed_tx,
1040            _maintain_metadata: cx.spawn_weak(move |this, cx| async move {
1041                let mut txs = Vec::new();
1042                while let Some(tx) = metadata_changed_rx.next().await {
1043                    txs.push(tx);
1044                    while let Ok(Some(next_tx)) = metadata_changed_rx.try_next() {
1045                        txs.push(next_tx);
1046                    }
1047
1048                    let Some(this) = this.upgrade(&cx) else { break };
1049                    this.read_with(&cx, |this, cx| {
1050                        this.client.request(proto::UpdateProject {
1051                            project_id,
1052                            worktrees: this.worktree_metadata_protos(cx),
1053                        })
1054                    })
1055                    .await
1056                    .log_err();
1057
1058                    for tx in txs.drain(..) {
1059                        let _ = tx.send(());
1060                    }
1061                }
1062            }),
1063        });
1064
1065        cx.foreground().spawn(async move {
1066            futures::future::try_join_all(worktree_share_tasks).await?;
1067            Ok(())
1068        })
1069    }
1070
1071    pub fn reshared(
1072        &mut self,
1073        message: proto::ResharedProject,
1074        cx: &mut ModelContext<Self>,
1075    ) -> Result<()> {
1076        self.set_collaborators_from_proto(message.collaborators, cx)?;
1077        for worktree in self.worktrees.iter() {
1078            if let Some(worktree) = worktree.upgrade(&cx) {
1079                worktree.update(cx, |worktree, _| {
1080                    if let Some(worktree) = worktree.as_local_mut() {
1081                        worktree.reshare()
1082                    } else {
1083                        Ok(())
1084                    }
1085                })?;
1086            }
1087        }
1088        Ok(())
1089    }
1090
1091    pub fn rejoined(
1092        &mut self,
1093        message: proto::RejoinedProject,
1094        cx: &mut ModelContext<Self>,
1095    ) -> Result<()> {
1096        self.set_worktrees_from_proto(message.worktrees, cx)?;
1097        self.set_collaborators_from_proto(message.collaborators, cx)?;
1098
1099        self.language_server_statuses = message
1100            .language_servers
1101            .into_iter()
1102            .map(|server| {
1103                (
1104                    server.id as usize,
1105                    LanguageServerStatus {
1106                        name: server.name,
1107                        pending_work: Default::default(),
1108                        has_pending_diagnostic_updates: false,
1109                        progress_tokens: Default::default(),
1110                    },
1111                )
1112            })
1113            .collect();
1114
1115        cx.notify();
1116        Ok(())
1117    }
1118
1119    pub fn unshare(&mut self, cx: &mut ModelContext<Self>) -> Result<()> {
1120        if self.is_remote() {
1121            return Err(anyhow!("attempted to unshare a remote project"));
1122        }
1123
1124        if let Some(ProjectClientState::Local { remote_id, .. }) = self.client_state.take() {
1125            self.collaborators.clear();
1126            self.shared_buffers.clear();
1127            self.client_subscriptions.clear();
1128
1129            for worktree_handle in self.worktrees.iter_mut() {
1130                if let WorktreeHandle::Strong(worktree) = worktree_handle {
1131                    let is_visible = worktree.update(cx, |worktree, _| {
1132                        worktree.as_local_mut().unwrap().unshare();
1133                        worktree.is_visible()
1134                    });
1135                    if !is_visible {
1136                        *worktree_handle = WorktreeHandle::Weak(worktree.downgrade());
1137                    }
1138                }
1139            }
1140
1141            for open_buffer in self.opened_buffers.values_mut() {
1142                if let OpenBuffer::Strong(buffer) = open_buffer {
1143                    *open_buffer = OpenBuffer::Weak(buffer.downgrade());
1144                }
1145            }
1146
1147            let _ = self.metadata_changed(cx);
1148            cx.notify();
1149            self.client.send(proto::UnshareProject {
1150                project_id: remote_id,
1151            })?;
1152
1153            Ok(())
1154        } else {
1155            Err(anyhow!("attempted to unshare an unshared project"))
1156        }
1157    }
1158
1159    pub fn disconnected_from_host(&mut self, cx: &mut ModelContext<Self>) {
1160        if let Some(ProjectClientState::Remote {
1161            sharing_has_stopped,
1162            ..
1163        }) = &mut self.client_state
1164        {
1165            *sharing_has_stopped = true;
1166            self.collaborators.clear();
1167            for worktree in &self.worktrees {
1168                if let Some(worktree) = worktree.upgrade(cx) {
1169                    worktree.update(cx, |worktree, _| {
1170                        if let Some(worktree) = worktree.as_remote_mut() {
1171                            worktree.disconnected_from_host();
1172                        }
1173                    });
1174                }
1175            }
1176            cx.emit(Event::DisconnectedFromHost);
1177            cx.notify();
1178
1179            // Wake up all futures currently waiting on a buffer to get opened,
1180            // to give them a chance to fail now that we've disconnected.
1181            *self.opened_buffer.0.borrow_mut() = ();
1182        }
1183    }
1184
1185    pub fn is_read_only(&self) -> bool {
1186        match &self.client_state {
1187            Some(ProjectClientState::Remote {
1188                sharing_has_stopped,
1189                ..
1190            }) => *sharing_has_stopped,
1191            _ => false,
1192        }
1193    }
1194
1195    pub fn is_local(&self) -> bool {
1196        match &self.client_state {
1197            Some(ProjectClientState::Remote { .. }) => false,
1198            _ => true,
1199        }
1200    }
1201
1202    pub fn is_remote(&self) -> bool {
1203        !self.is_local()
1204    }
1205
1206    pub fn create_terminal(
1207        &mut self,
1208        working_directory: Option<PathBuf>,
1209        window_id: usize,
1210        cx: &mut ModelContext<Self>,
1211    ) -> Result<ModelHandle<Terminal>> {
1212        if self.is_remote() {
1213            return Err(anyhow!(
1214                "creating terminals as a guest is not supported yet"
1215            ));
1216        } else {
1217            let settings = cx.global::<Settings>();
1218            let shell = settings.terminal_shell();
1219            let envs = settings.terminal_env();
1220            let scroll = settings.terminal_scroll();
1221
1222            TerminalBuilder::new(
1223                working_directory.clone(),
1224                shell,
1225                envs,
1226                settings.terminal_overrides.blinking.clone(),
1227                scroll,
1228                window_id,
1229            )
1230            .map(|builder| cx.add_model(|cx| builder.subscribe(cx)))
1231        }
1232    }
1233
1234    pub fn create_buffer(
1235        &mut self,
1236        text: &str,
1237        language: Option<Arc<Language>>,
1238        cx: &mut ModelContext<Self>,
1239    ) -> Result<ModelHandle<Buffer>> {
1240        if self.is_remote() {
1241            return Err(anyhow!("creating buffers as a guest is not supported yet"));
1242        }
1243
1244        let buffer = cx.add_model(|cx| {
1245            Buffer::new(self.replica_id(), text, cx)
1246                .with_language(language.unwrap_or_else(|| language::PLAIN_TEXT.clone()), cx)
1247        });
1248        self.register_buffer(&buffer, cx)?;
1249        Ok(buffer)
1250    }
1251
1252    pub fn open_path(
1253        &mut self,
1254        path: impl Into<ProjectPath>,
1255        cx: &mut ModelContext<Self>,
1256    ) -> Task<Result<(ProjectEntryId, AnyModelHandle)>> {
1257        let task = self.open_buffer(path, cx);
1258        cx.spawn_weak(|_, cx| async move {
1259            let buffer = task.await?;
1260            let project_entry_id = buffer
1261                .read_with(&cx, |buffer, cx| {
1262                    File::from_dyn(buffer.file()).and_then(|file| file.project_entry_id(cx))
1263                })
1264                .ok_or_else(|| anyhow!("no project entry"))?;
1265            Ok((project_entry_id, buffer.into()))
1266        })
1267    }
1268
1269    pub fn open_local_buffer(
1270        &mut self,
1271        abs_path: impl AsRef<Path>,
1272        cx: &mut ModelContext<Self>,
1273    ) -> Task<Result<ModelHandle<Buffer>>> {
1274        if let Some((worktree, relative_path)) = self.find_local_worktree(abs_path.as_ref(), cx) {
1275            self.open_buffer((worktree.read(cx).id(), relative_path), cx)
1276        } else {
1277            Task::ready(Err(anyhow!("no such path")))
1278        }
1279    }
1280
1281    pub fn open_buffer(
1282        &mut self,
1283        path: impl Into<ProjectPath>,
1284        cx: &mut ModelContext<Self>,
1285    ) -> Task<Result<ModelHandle<Buffer>>> {
1286        let project_path = path.into();
1287        let worktree = if let Some(worktree) = self.worktree_for_id(project_path.worktree_id, cx) {
1288            worktree
1289        } else {
1290            return Task::ready(Err(anyhow!("no such worktree")));
1291        };
1292
1293        // If there is already a buffer for the given path, then return it.
1294        let existing_buffer = self.get_open_buffer(&project_path, cx);
1295        if let Some(existing_buffer) = existing_buffer {
1296            return Task::ready(Ok(existing_buffer));
1297        }
1298
1299        let mut loading_watch = match self.loading_buffers.entry(project_path.clone()) {
1300            // If the given path is already being loaded, then wait for that existing
1301            // task to complete and return the same buffer.
1302            hash_map::Entry::Occupied(e) => e.get().clone(),
1303
1304            // Otherwise, record the fact that this path is now being loaded.
1305            hash_map::Entry::Vacant(entry) => {
1306                let (mut tx, rx) = postage::watch::channel();
1307                entry.insert(rx.clone());
1308
1309                let load_buffer = if worktree.read(cx).is_local() {
1310                    self.open_local_buffer_internal(&project_path.path, &worktree, cx)
1311                } else {
1312                    self.open_remote_buffer_internal(&project_path.path, &worktree, cx)
1313                };
1314
1315                cx.spawn(move |this, mut cx| async move {
1316                    let load_result = load_buffer.await;
1317                    *tx.borrow_mut() = Some(this.update(&mut cx, |this, _| {
1318                        // Record the fact that the buffer is no longer loading.
1319                        this.loading_buffers.remove(&project_path);
1320                        let buffer = load_result.map_err(Arc::new)?;
1321                        Ok(buffer)
1322                    }));
1323                })
1324                .detach();
1325                rx
1326            }
1327        };
1328
1329        cx.foreground().spawn(async move {
1330            loop {
1331                if let Some(result) = loading_watch.borrow().as_ref() {
1332                    match result {
1333                        Ok(buffer) => return Ok(buffer.clone()),
1334                        Err(error) => return Err(anyhow!("{}", error)),
1335                    }
1336                }
1337                loading_watch.next().await;
1338            }
1339        })
1340    }
1341
1342    fn open_local_buffer_internal(
1343        &mut self,
1344        path: &Arc<Path>,
1345        worktree: &ModelHandle<Worktree>,
1346        cx: &mut ModelContext<Self>,
1347    ) -> Task<Result<ModelHandle<Buffer>>> {
1348        let load_buffer = worktree.update(cx, |worktree, cx| {
1349            let worktree = worktree.as_local_mut().unwrap();
1350            worktree.load_buffer(path, cx)
1351        });
1352        cx.spawn(|this, mut cx| async move {
1353            let buffer = load_buffer.await?;
1354            this.update(&mut cx, |this, cx| this.register_buffer(&buffer, cx))?;
1355            Ok(buffer)
1356        })
1357    }
1358
1359    fn open_remote_buffer_internal(
1360        &mut self,
1361        path: &Arc<Path>,
1362        worktree: &ModelHandle<Worktree>,
1363        cx: &mut ModelContext<Self>,
1364    ) -> Task<Result<ModelHandle<Buffer>>> {
1365        let rpc = self.client.clone();
1366        let project_id = self.remote_id().unwrap();
1367        let remote_worktree_id = worktree.read(cx).id();
1368        let path = path.clone();
1369        let path_string = path.to_string_lossy().to_string();
1370        cx.spawn(|this, mut cx| async move {
1371            let response = rpc
1372                .request(proto::OpenBufferByPath {
1373                    project_id,
1374                    worktree_id: remote_worktree_id.to_proto(),
1375                    path: path_string,
1376                })
1377                .await?;
1378            this.update(&mut cx, |this, cx| {
1379                this.wait_for_buffer(response.buffer_id, cx)
1380            })
1381            .await
1382        })
1383    }
1384
1385    /// LanguageServerName is owned, because it is inserted into a map
1386    fn open_local_buffer_via_lsp(
1387        &mut self,
1388        abs_path: lsp::Url,
1389        language_server_id: usize,
1390        language_server_name: LanguageServerName,
1391        cx: &mut ModelContext<Self>,
1392    ) -> Task<Result<ModelHandle<Buffer>>> {
1393        cx.spawn(|this, mut cx| async move {
1394            let abs_path = abs_path
1395                .to_file_path()
1396                .map_err(|_| anyhow!("can't convert URI to path"))?;
1397            let (worktree, relative_path) = if let Some(result) =
1398                this.read_with(&cx, |this, cx| this.find_local_worktree(&abs_path, cx))
1399            {
1400                result
1401            } else {
1402                let worktree = this
1403                    .update(&mut cx, |this, cx| {
1404                        this.create_local_worktree(&abs_path, false, cx)
1405                    })
1406                    .await?;
1407                this.update(&mut cx, |this, cx| {
1408                    this.language_server_ids.insert(
1409                        (worktree.read(cx).id(), language_server_name),
1410                        language_server_id,
1411                    );
1412                });
1413                (worktree, PathBuf::new())
1414            };
1415
1416            let project_path = ProjectPath {
1417                worktree_id: worktree.read_with(&cx, |worktree, _| worktree.id()),
1418                path: relative_path.into(),
1419            };
1420            this.update(&mut cx, |this, cx| this.open_buffer(project_path, cx))
1421                .await
1422        })
1423    }
1424
1425    pub fn open_buffer_by_id(
1426        &mut self,
1427        id: u64,
1428        cx: &mut ModelContext<Self>,
1429    ) -> Task<Result<ModelHandle<Buffer>>> {
1430        if let Some(buffer) = self.buffer_for_id(id, cx) {
1431            Task::ready(Ok(buffer))
1432        } else if self.is_local() {
1433            Task::ready(Err(anyhow!("buffer {} does not exist", id)))
1434        } else if let Some(project_id) = self.remote_id() {
1435            let request = self
1436                .client
1437                .request(proto::OpenBufferById { project_id, id });
1438            cx.spawn(|this, mut cx| async move {
1439                let buffer_id = request.await?.buffer_id;
1440                this.update(&mut cx, |this, cx| this.wait_for_buffer(buffer_id, cx))
1441                    .await
1442            })
1443        } else {
1444            Task::ready(Err(anyhow!("cannot open buffer while disconnected")))
1445        }
1446    }
1447
1448    pub fn save_buffer_as(
1449        &mut self,
1450        buffer: ModelHandle<Buffer>,
1451        abs_path: PathBuf,
1452        cx: &mut ModelContext<Project>,
1453    ) -> Task<Result<()>> {
1454        let worktree_task = self.find_or_create_local_worktree(&abs_path, true, cx);
1455        let old_path =
1456            File::from_dyn(buffer.read(cx).file()).and_then(|f| Some(f.as_local()?.abs_path(cx)));
1457        cx.spawn(|this, mut cx| async move {
1458            if let Some(old_path) = old_path {
1459                this.update(&mut cx, |this, cx| {
1460                    this.unregister_buffer_from_language_server(&buffer, old_path, cx);
1461                });
1462            }
1463            let (worktree, path) = worktree_task.await?;
1464            worktree
1465                .update(&mut cx, |worktree, cx| {
1466                    worktree
1467                        .as_local_mut()
1468                        .unwrap()
1469                        .save_buffer_as(buffer.clone(), path, cx)
1470                })
1471                .await?;
1472            this.update(&mut cx, |this, cx| {
1473                this.assign_language_to_buffer(&buffer, cx);
1474                this.register_buffer_with_language_server(&buffer, cx);
1475            });
1476            Ok(())
1477        })
1478    }
1479
1480    pub fn get_open_buffer(
1481        &mut self,
1482        path: &ProjectPath,
1483        cx: &mut ModelContext<Self>,
1484    ) -> Option<ModelHandle<Buffer>> {
1485        let worktree = self.worktree_for_id(path.worktree_id, cx)?;
1486        self.opened_buffers.values().find_map(|buffer| {
1487            let buffer = buffer.upgrade(cx)?;
1488            let file = File::from_dyn(buffer.read(cx).file())?;
1489            if file.worktree == worktree && file.path() == &path.path {
1490                Some(buffer)
1491            } else {
1492                None
1493            }
1494        })
1495    }
1496
1497    fn register_buffer(
1498        &mut self,
1499        buffer: &ModelHandle<Buffer>,
1500        cx: &mut ModelContext<Self>,
1501    ) -> Result<()> {
1502        let remote_id = buffer.read(cx).remote_id();
1503        let open_buffer = if self.is_remote() || self.is_shared() {
1504            OpenBuffer::Strong(buffer.clone())
1505        } else {
1506            OpenBuffer::Weak(buffer.downgrade())
1507        };
1508
1509        match self.opened_buffers.insert(remote_id, open_buffer) {
1510            None => {}
1511            Some(OpenBuffer::Operations(operations)) => {
1512                buffer.update(cx, |buffer, cx| buffer.apply_ops(operations, cx))?
1513            }
1514            Some(OpenBuffer::Weak(existing_handle)) => {
1515                if existing_handle.upgrade(cx).is_some() {
1516                    Err(anyhow!(
1517                        "already registered buffer with remote id {}",
1518                        remote_id
1519                    ))?
1520                }
1521            }
1522            Some(OpenBuffer::Strong(_)) => Err(anyhow!(
1523                "already registered buffer with remote id {}",
1524                remote_id
1525            ))?,
1526        }
1527        cx.subscribe(buffer, |this, buffer, event, cx| {
1528            this.on_buffer_event(buffer, event, cx);
1529        })
1530        .detach();
1531
1532        self.assign_language_to_buffer(buffer, cx);
1533        self.register_buffer_with_language_server(buffer, cx);
1534        cx.observe_release(buffer, |this, buffer, cx| {
1535            if let Some(file) = File::from_dyn(buffer.file()) {
1536                if file.is_local() {
1537                    let uri = lsp::Url::from_file_path(file.abs_path(cx)).unwrap();
1538                    if let Some((_, server)) = this.language_server_for_buffer(buffer, cx) {
1539                        server
1540                            .notify::<lsp::notification::DidCloseTextDocument>(
1541                                lsp::DidCloseTextDocumentParams {
1542                                    text_document: lsp::TextDocumentIdentifier::new(uri),
1543                                },
1544                            )
1545                            .log_err();
1546                    }
1547                }
1548            }
1549        })
1550        .detach();
1551
1552        *self.opened_buffer.0.borrow_mut() = ();
1553        Ok(())
1554    }
1555
1556    fn register_buffer_with_language_server(
1557        &mut self,
1558        buffer_handle: &ModelHandle<Buffer>,
1559        cx: &mut ModelContext<Self>,
1560    ) {
1561        let buffer = buffer_handle.read(cx);
1562        let buffer_id = buffer.remote_id();
1563        if let Some(file) = File::from_dyn(buffer.file()) {
1564            if file.is_local() {
1565                let uri = lsp::Url::from_file_path(file.abs_path(cx)).unwrap();
1566                let initial_snapshot = buffer.text_snapshot();
1567
1568                let mut language_server = None;
1569                let mut language_id = None;
1570                if let Some(language) = buffer.language() {
1571                    let worktree_id = file.worktree_id(cx);
1572                    if let Some(adapter) = language.lsp_adapter() {
1573                        language_id = adapter.language_ids.get(language.name().as_ref()).cloned();
1574                        language_server = self
1575                            .language_server_ids
1576                            .get(&(worktree_id, adapter.name.clone()))
1577                            .and_then(|id| self.language_servers.get(id))
1578                            .and_then(|server_state| {
1579                                if let LanguageServerState::Running { server, .. } = server_state {
1580                                    Some(server.clone())
1581                                } else {
1582                                    None
1583                                }
1584                            });
1585                    }
1586                }
1587
1588                if let Some(local_worktree) = file.worktree.read(cx).as_local() {
1589                    if let Some(diagnostics) = local_worktree.diagnostics_for_path(file.path()) {
1590                        self.update_buffer_diagnostics(buffer_handle, diagnostics, None, cx)
1591                            .log_err();
1592                    }
1593                }
1594
1595                if let Some(server) = language_server {
1596                    server
1597                        .notify::<lsp::notification::DidOpenTextDocument>(
1598                            lsp::DidOpenTextDocumentParams {
1599                                text_document: lsp::TextDocumentItem::new(
1600                                    uri,
1601                                    language_id.unwrap_or_default(),
1602                                    0,
1603                                    initial_snapshot.text(),
1604                                ),
1605                            },
1606                        )
1607                        .log_err();
1608                    buffer_handle.update(cx, |buffer, cx| {
1609                        buffer.set_completion_triggers(
1610                            server
1611                                .capabilities()
1612                                .completion_provider
1613                                .as_ref()
1614                                .and_then(|provider| provider.trigger_characters.clone())
1615                                .unwrap_or_default(),
1616                            cx,
1617                        )
1618                    });
1619                    self.buffer_snapshots
1620                        .insert(buffer_id, vec![(0, initial_snapshot)]);
1621                }
1622            }
1623        }
1624    }
1625
1626    fn unregister_buffer_from_language_server(
1627        &mut self,
1628        buffer: &ModelHandle<Buffer>,
1629        old_path: PathBuf,
1630        cx: &mut ModelContext<Self>,
1631    ) {
1632        buffer.update(cx, |buffer, cx| {
1633            buffer.update_diagnostics(Default::default(), cx);
1634            self.buffer_snapshots.remove(&buffer.remote_id());
1635            if let Some((_, language_server)) = self.language_server_for_buffer(buffer, cx) {
1636                language_server
1637                    .notify::<lsp::notification::DidCloseTextDocument>(
1638                        lsp::DidCloseTextDocumentParams {
1639                            text_document: lsp::TextDocumentIdentifier::new(
1640                                lsp::Url::from_file_path(old_path).unwrap(),
1641                            ),
1642                        },
1643                    )
1644                    .log_err();
1645            }
1646        });
1647    }
1648
1649    fn on_buffer_event(
1650        &mut self,
1651        buffer: ModelHandle<Buffer>,
1652        event: &BufferEvent,
1653        cx: &mut ModelContext<Self>,
1654    ) -> Option<()> {
1655        match event {
1656            BufferEvent::Operation(operation) => {
1657                if let Some(project_id) = self.remote_id() {
1658                    let request = self.client.request(proto::UpdateBuffer {
1659                        project_id,
1660                        buffer_id: buffer.read(cx).remote_id(),
1661                        operations: vec![language::proto::serialize_operation(operation)],
1662                    });
1663                    cx.background().spawn(request).detach_and_log_err(cx);
1664                }
1665            }
1666            BufferEvent::Edited { .. } => {
1667                let language_server = self
1668                    .language_server_for_buffer(buffer.read(cx), cx)
1669                    .map(|(_, server)| server.clone())?;
1670                let buffer = buffer.read(cx);
1671                let file = File::from_dyn(buffer.file())?;
1672                let abs_path = file.as_local()?.abs_path(cx);
1673                let uri = lsp::Url::from_file_path(abs_path).unwrap();
1674                let buffer_snapshots = self.buffer_snapshots.get_mut(&buffer.remote_id())?;
1675                let (version, prev_snapshot) = buffer_snapshots.last()?;
1676                let next_snapshot = buffer.text_snapshot();
1677                let next_version = version + 1;
1678
1679                let content_changes = buffer
1680                    .edits_since::<(PointUtf16, usize)>(prev_snapshot.version())
1681                    .map(|edit| {
1682                        let edit_start = edit.new.start.0;
1683                        let edit_end = edit_start + (edit.old.end.0 - edit.old.start.0);
1684                        let new_text = next_snapshot
1685                            .text_for_range(edit.new.start.1..edit.new.end.1)
1686                            .collect();
1687                        lsp::TextDocumentContentChangeEvent {
1688                            range: Some(lsp::Range::new(
1689                                point_to_lsp(edit_start),
1690                                point_to_lsp(edit_end),
1691                            )),
1692                            range_length: None,
1693                            text: new_text,
1694                        }
1695                    })
1696                    .collect();
1697
1698                buffer_snapshots.push((next_version, next_snapshot));
1699
1700                language_server
1701                    .notify::<lsp::notification::DidChangeTextDocument>(
1702                        lsp::DidChangeTextDocumentParams {
1703                            text_document: lsp::VersionedTextDocumentIdentifier::new(
1704                                uri,
1705                                next_version,
1706                            ),
1707                            content_changes,
1708                        },
1709                    )
1710                    .log_err();
1711            }
1712            BufferEvent::Saved => {
1713                let file = File::from_dyn(buffer.read(cx).file())?;
1714                let worktree_id = file.worktree_id(cx);
1715                let abs_path = file.as_local()?.abs_path(cx);
1716                let text_document = lsp::TextDocumentIdentifier {
1717                    uri: lsp::Url::from_file_path(abs_path).unwrap(),
1718                };
1719
1720                for (_, _, server) in self.language_servers_for_worktree(worktree_id) {
1721                    server
1722                        .notify::<lsp::notification::DidSaveTextDocument>(
1723                            lsp::DidSaveTextDocumentParams {
1724                                text_document: text_document.clone(),
1725                                text: None,
1726                            },
1727                        )
1728                        .log_err();
1729                }
1730
1731                // After saving a buffer, simulate disk-based diagnostics being finished for languages
1732                // that don't support a disk-based progress token.
1733                let (lsp_adapter, language_server) =
1734                    self.language_server_for_buffer(buffer.read(cx), cx)?;
1735                if lsp_adapter.disk_based_diagnostics_progress_token.is_none() {
1736                    let server_id = language_server.server_id();
1737                    self.disk_based_diagnostics_finished(server_id, cx);
1738                    self.broadcast_language_server_update(
1739                        server_id,
1740                        proto::update_language_server::Variant::DiskBasedDiagnosticsUpdated(
1741                            proto::LspDiskBasedDiagnosticsUpdated {},
1742                        ),
1743                    );
1744                }
1745            }
1746            _ => {}
1747        }
1748
1749        None
1750    }
1751
1752    fn language_servers_for_worktree(
1753        &self,
1754        worktree_id: WorktreeId,
1755    ) -> impl Iterator<Item = (&Arc<CachedLspAdapter>, &Arc<Language>, &Arc<LanguageServer>)> {
1756        self.language_server_ids
1757            .iter()
1758            .filter_map(move |((language_server_worktree_id, _), id)| {
1759                if *language_server_worktree_id == worktree_id {
1760                    if let Some(LanguageServerState::Running {
1761                        adapter,
1762                        language,
1763                        server,
1764                    }) = self.language_servers.get(id)
1765                    {
1766                        return Some((adapter, language, server));
1767                    }
1768                }
1769                None
1770            })
1771    }
1772
1773    fn maintain_buffer_languages(
1774        languages: &LanguageRegistry,
1775        cx: &mut ModelContext<Project>,
1776    ) -> Task<()> {
1777        let mut subscription = languages.subscribe();
1778        cx.spawn_weak(|project, mut cx| async move {
1779            while let Some(()) = subscription.next().await {
1780                if let Some(project) = project.upgrade(&cx) {
1781                    project.update(&mut cx, |project, cx| {
1782                        let mut buffers_without_language = Vec::new();
1783                        for buffer in project.opened_buffers.values() {
1784                            if let Some(buffer) = buffer.upgrade(cx) {
1785                                if buffer.read(cx).language().is_none() {
1786                                    buffers_without_language.push(buffer);
1787                                }
1788                            }
1789                        }
1790
1791                        for buffer in buffers_without_language {
1792                            project.assign_language_to_buffer(&buffer, cx);
1793                            project.register_buffer_with_language_server(&buffer, cx);
1794                        }
1795                    });
1796                }
1797            }
1798        })
1799    }
1800
1801    fn assign_language_to_buffer(
1802        &mut self,
1803        buffer: &ModelHandle<Buffer>,
1804        cx: &mut ModelContext<Self>,
1805    ) -> Option<()> {
1806        // If the buffer has a language, set it and start the language server if we haven't already.
1807        let full_path = buffer.read(cx).file()?.full_path(cx);
1808        let new_language = self.languages.select_language(&full_path)?;
1809        buffer.update(cx, |buffer, cx| {
1810            if buffer.language().map_or(true, |old_language| {
1811                !Arc::ptr_eq(old_language, &new_language)
1812            }) {
1813                buffer.set_language_registry(self.languages.clone());
1814                buffer.set_language(Some(new_language.clone()), cx);
1815            }
1816        });
1817
1818        let file = File::from_dyn(buffer.read(cx).file())?;
1819        let worktree = file.worktree.read(cx).as_local()?;
1820        let worktree_id = worktree.id();
1821        let worktree_abs_path = worktree.abs_path().clone();
1822        self.start_language_server(worktree_id, worktree_abs_path, new_language, cx);
1823
1824        None
1825    }
1826
1827    fn merge_json_value_into(source: serde_json::Value, target: &mut serde_json::Value) {
1828        use serde_json::Value;
1829
1830        match (source, target) {
1831            (Value::Object(source), Value::Object(target)) => {
1832                for (key, value) in source {
1833                    if let Some(target) = target.get_mut(&key) {
1834                        Self::merge_json_value_into(value, target);
1835                    } else {
1836                        target.insert(key.clone(), value);
1837                    }
1838                }
1839            }
1840
1841            (source, target) => *target = source,
1842        }
1843    }
1844
1845    fn start_language_server(
1846        &mut self,
1847        worktree_id: WorktreeId,
1848        worktree_path: Arc<Path>,
1849        language: Arc<Language>,
1850        cx: &mut ModelContext<Self>,
1851    ) {
1852        if !cx
1853            .global::<Settings>()
1854            .enable_language_server(Some(&language.name()))
1855        {
1856            return;
1857        }
1858
1859        let adapter = if let Some(adapter) = language.lsp_adapter() {
1860            adapter
1861        } else {
1862            return;
1863        };
1864        let key = (worktree_id, adapter.name.clone());
1865
1866        let mut initialization_options = adapter.initialization_options.clone();
1867
1868        let lsp = &cx.global::<Settings>().lsp.get(&adapter.name.0);
1869        let override_options = lsp.map(|s| s.initialization_options.clone()).flatten();
1870        match (&mut initialization_options, override_options) {
1871            (Some(initialization_options), Some(override_options)) => {
1872                Self::merge_json_value_into(override_options, initialization_options);
1873            }
1874
1875            (None, override_options) => initialization_options = override_options,
1876
1877            _ => {}
1878        }
1879
1880        self.language_server_ids
1881            .entry(key.clone())
1882            .or_insert_with(|| {
1883                let server_id = post_inc(&mut self.next_language_server_id);
1884                let language_server = self.languages.start_language_server(
1885                    server_id,
1886                    language.clone(),
1887                    worktree_path,
1888                    self.client.http_client(),
1889                    cx,
1890                );
1891                self.language_servers.insert(
1892                    server_id,
1893                    LanguageServerState::Starting(cx.spawn_weak(|this, mut cx| async move {
1894                        let language_server = language_server?.await.log_err()?;
1895                        let language_server = language_server
1896                            .initialize(initialization_options)
1897                            .await
1898                            .log_err()?;
1899                        let this = this.upgrade(&cx)?;
1900
1901                        language_server
1902                            .on_notification::<lsp::notification::PublishDiagnostics, _>({
1903                                let this = this.downgrade();
1904                                let adapter = adapter.clone();
1905                                move |mut params, cx| {
1906                                    let this = this;
1907                                    let adapter = adapter.clone();
1908                                    cx.spawn(|mut cx| async move {
1909                                        adapter.process_diagnostics(&mut params).await;
1910                                        if let Some(this) = this.upgrade(&cx) {
1911                                            this.update(&mut cx, |this, cx| {
1912                                                this.update_diagnostics(
1913                                                    server_id,
1914                                                    params,
1915                                                    &adapter.disk_based_diagnostic_sources,
1916                                                    cx,
1917                                                )
1918                                                .log_err();
1919                                            });
1920                                        }
1921                                    })
1922                                    .detach();
1923                                }
1924                            })
1925                            .detach();
1926
1927                        language_server
1928                            .on_request::<lsp::request::WorkspaceConfiguration, _, _>({
1929                                let settings = this.read_with(&cx, |this, _| {
1930                                    this.language_server_settings.clone()
1931                                });
1932                                move |params, _| {
1933                                    let settings = settings.lock().clone();
1934                                    async move {
1935                                        Ok(params
1936                                            .items
1937                                            .into_iter()
1938                                            .map(|item| {
1939                                                if let Some(section) = &item.section {
1940                                                    settings
1941                                                        .get(section)
1942                                                        .cloned()
1943                                                        .unwrap_or(serde_json::Value::Null)
1944                                                } else {
1945                                                    settings.clone()
1946                                                }
1947                                            })
1948                                            .collect())
1949                                    }
1950                                }
1951                            })
1952                            .detach();
1953
1954                        // Even though we don't have handling for these requests, respond to them to
1955                        // avoid stalling any language server like `gopls` which waits for a response
1956                        // to these requests when initializing.
1957                        language_server
1958                            .on_request::<lsp::request::WorkDoneProgressCreate, _, _>({
1959                                let this = this.downgrade();
1960                                move |params, mut cx| async move {
1961                                    if let Some(this) = this.upgrade(&cx) {
1962                                        this.update(&mut cx, |this, _| {
1963                                            if let Some(status) =
1964                                                this.language_server_statuses.get_mut(&server_id)
1965                                            {
1966                                                if let lsp::NumberOrString::String(token) =
1967                                                    params.token
1968                                                {
1969                                                    status.progress_tokens.insert(token);
1970                                                }
1971                                            }
1972                                        });
1973                                    }
1974                                    Ok(())
1975                                }
1976                            })
1977                            .detach();
1978                        language_server
1979                            .on_request::<lsp::request::RegisterCapability, _, _>(|_, _| async {
1980                                Ok(())
1981                            })
1982                            .detach();
1983
1984                        language_server
1985                            .on_request::<lsp::request::ApplyWorkspaceEdit, _, _>({
1986                                let this = this.downgrade();
1987                                let adapter = adapter.clone();
1988                                let language_server = language_server.clone();
1989                                move |params, cx| {
1990                                    Self::on_lsp_workspace_edit(
1991                                        this,
1992                                        params,
1993                                        server_id,
1994                                        adapter.clone(),
1995                                        language_server.clone(),
1996                                        cx,
1997                                    )
1998                                }
1999                            })
2000                            .detach();
2001
2002                        let disk_based_diagnostics_progress_token =
2003                            adapter.disk_based_diagnostics_progress_token.clone();
2004
2005                        language_server
2006                            .on_notification::<lsp::notification::Progress, _>({
2007                                let this = this.downgrade();
2008                                move |params, mut cx| {
2009                                    if let Some(this) = this.upgrade(&cx) {
2010                                        this.update(&mut cx, |this, cx| {
2011                                            this.on_lsp_progress(
2012                                                params,
2013                                                server_id,
2014                                                disk_based_diagnostics_progress_token.clone(),
2015                                                cx,
2016                                            );
2017                                        });
2018                                    }
2019                                }
2020                            })
2021                            .detach();
2022
2023                        this.update(&mut cx, |this, cx| {
2024                            // If the language server for this key doesn't match the server id, don't store the
2025                            // server. Which will cause it to be dropped, killing the process
2026                            if this
2027                                .language_server_ids
2028                                .get(&key)
2029                                .map(|id| id != &server_id)
2030                                .unwrap_or(false)
2031                            {
2032                                return None;
2033                            }
2034
2035                            // Update language_servers collection with Running variant of LanguageServerState
2036                            // indicating that the server is up and running and ready
2037                            this.language_servers.insert(
2038                                server_id,
2039                                LanguageServerState::Running {
2040                                    adapter: adapter.clone(),
2041                                    language,
2042                                    server: language_server.clone(),
2043                                },
2044                            );
2045                            this.language_server_statuses.insert(
2046                                server_id,
2047                                LanguageServerStatus {
2048                                    name: language_server.name().to_string(),
2049                                    pending_work: Default::default(),
2050                                    has_pending_diagnostic_updates: false,
2051                                    progress_tokens: Default::default(),
2052                                },
2053                            );
2054                            language_server
2055                                .notify::<lsp::notification::DidChangeConfiguration>(
2056                                    lsp::DidChangeConfigurationParams {
2057                                        settings: this.language_server_settings.lock().clone(),
2058                                    },
2059                                )
2060                                .ok();
2061
2062                            if let Some(project_id) = this.remote_id() {
2063                                this.client
2064                                    .send(proto::StartLanguageServer {
2065                                        project_id,
2066                                        server: Some(proto::LanguageServer {
2067                                            id: server_id as u64,
2068                                            name: language_server.name().to_string(),
2069                                        }),
2070                                    })
2071                                    .log_err();
2072                            }
2073
2074                            // Tell the language server about every open buffer in the worktree that matches the language.
2075                            for buffer in this.opened_buffers.values() {
2076                                if let Some(buffer_handle) = buffer.upgrade(cx) {
2077                                    let buffer = buffer_handle.read(cx);
2078                                    let file = if let Some(file) = File::from_dyn(buffer.file()) {
2079                                        file
2080                                    } else {
2081                                        continue;
2082                                    };
2083                                    let language = if let Some(language) = buffer.language() {
2084                                        language
2085                                    } else {
2086                                        continue;
2087                                    };
2088                                    if file.worktree.read(cx).id() != key.0
2089                                        || language.lsp_adapter().map(|a| a.name.clone())
2090                                            != Some(key.1.clone())
2091                                    {
2092                                        continue;
2093                                    }
2094
2095                                    let file = file.as_local()?;
2096                                    let versions = this
2097                                        .buffer_snapshots
2098                                        .entry(buffer.remote_id())
2099                                        .or_insert_with(|| vec![(0, buffer.text_snapshot())]);
2100                                    let (version, initial_snapshot) = versions.last().unwrap();
2101                                    let uri = lsp::Url::from_file_path(file.abs_path(cx)).unwrap();
2102                                    language_server
2103                                        .notify::<lsp::notification::DidOpenTextDocument>(
2104                                            lsp::DidOpenTextDocumentParams {
2105                                                text_document: lsp::TextDocumentItem::new(
2106                                                    uri,
2107                                                    adapter
2108                                                        .language_ids
2109                                                        .get(language.name().as_ref())
2110                                                        .cloned()
2111                                                        .unwrap_or_default(),
2112                                                    *version,
2113                                                    initial_snapshot.text(),
2114                                                ),
2115                                            },
2116                                        )
2117                                        .log_err()?;
2118                                    buffer_handle.update(cx, |buffer, cx| {
2119                                        buffer.set_completion_triggers(
2120                                            language_server
2121                                                .capabilities()
2122                                                .completion_provider
2123                                                .as_ref()
2124                                                .and_then(|provider| {
2125                                                    provider.trigger_characters.clone()
2126                                                })
2127                                                .unwrap_or_default(),
2128                                            cx,
2129                                        )
2130                                    });
2131                                }
2132                            }
2133
2134                            cx.notify();
2135                            Some(language_server)
2136                        })
2137                    })),
2138                );
2139
2140                server_id
2141            });
2142    }
2143
2144    // Returns a list of all of the worktrees which no longer have a language server and the root path
2145    // for the stopped server
2146    fn stop_language_server(
2147        &mut self,
2148        worktree_id: WorktreeId,
2149        adapter_name: LanguageServerName,
2150        cx: &mut ModelContext<Self>,
2151    ) -> Task<(Option<PathBuf>, Vec<WorktreeId>)> {
2152        let key = (worktree_id, adapter_name);
2153        if let Some(server_id) = self.language_server_ids.remove(&key) {
2154            // Remove other entries for this language server as well
2155            let mut orphaned_worktrees = vec![worktree_id];
2156            let other_keys = self.language_server_ids.keys().cloned().collect::<Vec<_>>();
2157            for other_key in other_keys {
2158                if self.language_server_ids.get(&other_key) == Some(&server_id) {
2159                    self.language_server_ids.remove(&other_key);
2160                    orphaned_worktrees.push(other_key.0);
2161                }
2162            }
2163
2164            self.language_server_statuses.remove(&server_id);
2165            cx.notify();
2166
2167            let server_state = self.language_servers.remove(&server_id);
2168            cx.spawn_weak(|this, mut cx| async move {
2169                let mut root_path = None;
2170
2171                let server = match server_state {
2172                    Some(LanguageServerState::Starting(started_language_server)) => {
2173                        started_language_server.await
2174                    }
2175                    Some(LanguageServerState::Running { server, .. }) => Some(server),
2176                    None => None,
2177                };
2178
2179                if let Some(server) = server {
2180                    root_path = Some(server.root_path().clone());
2181                    if let Some(shutdown) = server.shutdown() {
2182                        shutdown.await;
2183                    }
2184                }
2185
2186                if let Some(this) = this.upgrade(&cx) {
2187                    this.update(&mut cx, |this, cx| {
2188                        this.language_server_statuses.remove(&server_id);
2189                        cx.notify();
2190                    });
2191                }
2192
2193                (root_path, orphaned_worktrees)
2194            })
2195        } else {
2196            Task::ready((None, Vec::new()))
2197        }
2198    }
2199
2200    pub fn restart_language_servers_for_buffers(
2201        &mut self,
2202        buffers: impl IntoIterator<Item = ModelHandle<Buffer>>,
2203        cx: &mut ModelContext<Self>,
2204    ) -> Option<()> {
2205        let language_server_lookup_info: HashSet<(WorktreeId, Arc<Path>, PathBuf)> = buffers
2206            .into_iter()
2207            .filter_map(|buffer| {
2208                let file = File::from_dyn(buffer.read(cx).file())?;
2209                let worktree = file.worktree.read(cx).as_local()?;
2210                let worktree_id = worktree.id();
2211                let worktree_abs_path = worktree.abs_path().clone();
2212                let full_path = file.full_path(cx);
2213                Some((worktree_id, worktree_abs_path, full_path))
2214            })
2215            .collect();
2216        for (worktree_id, worktree_abs_path, full_path) in language_server_lookup_info {
2217            let language = self.languages.select_language(&full_path)?;
2218            self.restart_language_server(worktree_id, worktree_abs_path, language, cx);
2219        }
2220
2221        None
2222    }
2223
2224    fn restart_language_server(
2225        &mut self,
2226        worktree_id: WorktreeId,
2227        fallback_path: Arc<Path>,
2228        language: Arc<Language>,
2229        cx: &mut ModelContext<Self>,
2230    ) {
2231        let adapter = if let Some(adapter) = language.lsp_adapter() {
2232            adapter
2233        } else {
2234            return;
2235        };
2236
2237        let server_name = adapter.name.clone();
2238        let stop = self.stop_language_server(worktree_id, server_name.clone(), cx);
2239        cx.spawn_weak(|this, mut cx| async move {
2240            let (original_root_path, orphaned_worktrees) = stop.await;
2241            if let Some(this) = this.upgrade(&cx) {
2242                this.update(&mut cx, |this, cx| {
2243                    // Attempt to restart using original server path. Fallback to passed in
2244                    // path if we could not retrieve the root path
2245                    let root_path = original_root_path
2246                        .map(|path_buf| Arc::from(path_buf.as_path()))
2247                        .unwrap_or(fallback_path);
2248
2249                    this.start_language_server(worktree_id, root_path, language, cx);
2250
2251                    // Lookup new server id and set it for each of the orphaned worktrees
2252                    if let Some(new_server_id) = this
2253                        .language_server_ids
2254                        .get(&(worktree_id, server_name.clone()))
2255                        .cloned()
2256                    {
2257                        for orphaned_worktree in orphaned_worktrees {
2258                            this.language_server_ids
2259                                .insert((orphaned_worktree, server_name.clone()), new_server_id);
2260                        }
2261                    }
2262                });
2263            }
2264        })
2265        .detach();
2266    }
2267
2268    fn on_lsp_progress(
2269        &mut self,
2270        progress: lsp::ProgressParams,
2271        server_id: usize,
2272        disk_based_diagnostics_progress_token: Option<String>,
2273        cx: &mut ModelContext<Self>,
2274    ) {
2275        let token = match progress.token {
2276            lsp::NumberOrString::String(token) => token,
2277            lsp::NumberOrString::Number(token) => {
2278                log::info!("skipping numeric progress token {}", token);
2279                return;
2280            }
2281        };
2282        let lsp::ProgressParamsValue::WorkDone(progress) = progress.value;
2283        let language_server_status =
2284            if let Some(status) = self.language_server_statuses.get_mut(&server_id) {
2285                status
2286            } else {
2287                return;
2288            };
2289
2290        if !language_server_status.progress_tokens.contains(&token) {
2291            return;
2292        }
2293
2294        let is_disk_based_diagnostics_progress = disk_based_diagnostics_progress_token
2295            .as_ref()
2296            .map_or(false, |disk_based_token| {
2297                token.starts_with(disk_based_token)
2298            });
2299
2300        match progress {
2301            lsp::WorkDoneProgress::Begin(report) => {
2302                if is_disk_based_diagnostics_progress {
2303                    language_server_status.has_pending_diagnostic_updates = true;
2304                    self.disk_based_diagnostics_started(server_id, cx);
2305                    self.broadcast_language_server_update(
2306                        server_id,
2307                        proto::update_language_server::Variant::DiskBasedDiagnosticsUpdating(
2308                            proto::LspDiskBasedDiagnosticsUpdating {},
2309                        ),
2310                    );
2311                } else {
2312                    self.on_lsp_work_start(
2313                        server_id,
2314                        token.clone(),
2315                        LanguageServerProgress {
2316                            message: report.message.clone(),
2317                            percentage: report.percentage.map(|p| p as usize),
2318                            last_update_at: Instant::now(),
2319                        },
2320                        cx,
2321                    );
2322                    self.broadcast_language_server_update(
2323                        server_id,
2324                        proto::update_language_server::Variant::WorkStart(proto::LspWorkStart {
2325                            token,
2326                            message: report.message,
2327                            percentage: report.percentage.map(|p| p as u32),
2328                        }),
2329                    );
2330                }
2331            }
2332            lsp::WorkDoneProgress::Report(report) => {
2333                if !is_disk_based_diagnostics_progress {
2334                    self.on_lsp_work_progress(
2335                        server_id,
2336                        token.clone(),
2337                        LanguageServerProgress {
2338                            message: report.message.clone(),
2339                            percentage: report.percentage.map(|p| p as usize),
2340                            last_update_at: Instant::now(),
2341                        },
2342                        cx,
2343                    );
2344                    self.broadcast_language_server_update(
2345                        server_id,
2346                        proto::update_language_server::Variant::WorkProgress(
2347                            proto::LspWorkProgress {
2348                                token,
2349                                message: report.message,
2350                                percentage: report.percentage.map(|p| p as u32),
2351                            },
2352                        ),
2353                    );
2354                }
2355            }
2356            lsp::WorkDoneProgress::End(_) => {
2357                language_server_status.progress_tokens.remove(&token);
2358
2359                if is_disk_based_diagnostics_progress {
2360                    language_server_status.has_pending_diagnostic_updates = false;
2361                    self.disk_based_diagnostics_finished(server_id, cx);
2362                    self.broadcast_language_server_update(
2363                        server_id,
2364                        proto::update_language_server::Variant::DiskBasedDiagnosticsUpdated(
2365                            proto::LspDiskBasedDiagnosticsUpdated {},
2366                        ),
2367                    );
2368                } else {
2369                    self.on_lsp_work_end(server_id, token.clone(), cx);
2370                    self.broadcast_language_server_update(
2371                        server_id,
2372                        proto::update_language_server::Variant::WorkEnd(proto::LspWorkEnd {
2373                            token,
2374                        }),
2375                    );
2376                }
2377            }
2378        }
2379    }
2380
2381    fn on_lsp_work_start(
2382        &mut self,
2383        language_server_id: usize,
2384        token: String,
2385        progress: LanguageServerProgress,
2386        cx: &mut ModelContext<Self>,
2387    ) {
2388        if let Some(status) = self.language_server_statuses.get_mut(&language_server_id) {
2389            status.pending_work.insert(token, progress);
2390            cx.notify();
2391        }
2392    }
2393
2394    fn on_lsp_work_progress(
2395        &mut self,
2396        language_server_id: usize,
2397        token: String,
2398        progress: LanguageServerProgress,
2399        cx: &mut ModelContext<Self>,
2400    ) {
2401        if let Some(status) = self.language_server_statuses.get_mut(&language_server_id) {
2402            let entry = status
2403                .pending_work
2404                .entry(token)
2405                .or_insert(LanguageServerProgress {
2406                    message: Default::default(),
2407                    percentage: Default::default(),
2408                    last_update_at: progress.last_update_at,
2409                });
2410            if progress.message.is_some() {
2411                entry.message = progress.message;
2412            }
2413            if progress.percentage.is_some() {
2414                entry.percentage = progress.percentage;
2415            }
2416            entry.last_update_at = progress.last_update_at;
2417            cx.notify();
2418        }
2419    }
2420
2421    fn on_lsp_work_end(
2422        &mut self,
2423        language_server_id: usize,
2424        token: String,
2425        cx: &mut ModelContext<Self>,
2426    ) {
2427        if let Some(status) = self.language_server_statuses.get_mut(&language_server_id) {
2428            status.pending_work.remove(&token);
2429            cx.notify();
2430        }
2431    }
2432
2433    async fn on_lsp_workspace_edit(
2434        this: WeakModelHandle<Self>,
2435        params: lsp::ApplyWorkspaceEditParams,
2436        server_id: usize,
2437        adapter: Arc<CachedLspAdapter>,
2438        language_server: Arc<LanguageServer>,
2439        mut cx: AsyncAppContext,
2440    ) -> Result<lsp::ApplyWorkspaceEditResponse> {
2441        let this = this
2442            .upgrade(&cx)
2443            .ok_or_else(|| anyhow!("project project closed"))?;
2444        let transaction = Self::deserialize_workspace_edit(
2445            this.clone(),
2446            params.edit,
2447            true,
2448            adapter.clone(),
2449            language_server.clone(),
2450            &mut cx,
2451        )
2452        .await
2453        .log_err();
2454        this.update(&mut cx, |this, _| {
2455            if let Some(transaction) = transaction {
2456                this.last_workspace_edits_by_language_server
2457                    .insert(server_id, transaction);
2458            }
2459        });
2460        Ok(lsp::ApplyWorkspaceEditResponse {
2461            applied: true,
2462            failed_change: None,
2463            failure_reason: None,
2464        })
2465    }
2466
2467    fn broadcast_language_server_update(
2468        &self,
2469        language_server_id: usize,
2470        event: proto::update_language_server::Variant,
2471    ) {
2472        if let Some(project_id) = self.remote_id() {
2473            self.client
2474                .send(proto::UpdateLanguageServer {
2475                    project_id,
2476                    language_server_id: language_server_id as u64,
2477                    variant: Some(event),
2478                })
2479                .log_err();
2480        }
2481    }
2482
2483    pub fn set_language_server_settings(&mut self, settings: serde_json::Value) {
2484        for server_state in self.language_servers.values() {
2485            if let LanguageServerState::Running { server, .. } = server_state {
2486                server
2487                    .notify::<lsp::notification::DidChangeConfiguration>(
2488                        lsp::DidChangeConfigurationParams {
2489                            settings: settings.clone(),
2490                        },
2491                    )
2492                    .ok();
2493            }
2494        }
2495        *self.language_server_settings.lock() = settings;
2496    }
2497
2498    pub fn language_server_statuses(
2499        &self,
2500    ) -> impl DoubleEndedIterator<Item = &LanguageServerStatus> {
2501        self.language_server_statuses.values()
2502    }
2503
2504    pub fn update_diagnostics(
2505        &mut self,
2506        language_server_id: usize,
2507        params: lsp::PublishDiagnosticsParams,
2508        disk_based_sources: &[String],
2509        cx: &mut ModelContext<Self>,
2510    ) -> Result<()> {
2511        let abs_path = params
2512            .uri
2513            .to_file_path()
2514            .map_err(|_| anyhow!("URI is not a file"))?;
2515        let mut diagnostics = Vec::default();
2516        let mut primary_diagnostic_group_ids = HashMap::default();
2517        let mut sources_by_group_id = HashMap::default();
2518        let mut supporting_diagnostics = HashMap::default();
2519        for diagnostic in &params.diagnostics {
2520            let source = diagnostic.source.as_ref();
2521            let code = diagnostic.code.as_ref().map(|code| match code {
2522                lsp::NumberOrString::Number(code) => code.to_string(),
2523                lsp::NumberOrString::String(code) => code.clone(),
2524            });
2525            let range = range_from_lsp(diagnostic.range);
2526            let is_supporting = diagnostic
2527                .related_information
2528                .as_ref()
2529                .map_or(false, |infos| {
2530                    infos.iter().any(|info| {
2531                        primary_diagnostic_group_ids.contains_key(&(
2532                            source,
2533                            code.clone(),
2534                            range_from_lsp(info.location.range),
2535                        ))
2536                    })
2537                });
2538
2539            let is_unnecessary = diagnostic.tags.as_ref().map_or(false, |tags| {
2540                tags.iter().any(|tag| *tag == DiagnosticTag::UNNECESSARY)
2541            });
2542
2543            if is_supporting {
2544                supporting_diagnostics.insert(
2545                    (source, code.clone(), range),
2546                    (diagnostic.severity, is_unnecessary),
2547                );
2548            } else {
2549                let group_id = post_inc(&mut self.next_diagnostic_group_id);
2550                let is_disk_based =
2551                    source.map_or(false, |source| disk_based_sources.contains(source));
2552
2553                sources_by_group_id.insert(group_id, source);
2554                primary_diagnostic_group_ids
2555                    .insert((source, code.clone(), range.clone()), group_id);
2556
2557                diagnostics.push(DiagnosticEntry {
2558                    range,
2559                    diagnostic: Diagnostic {
2560                        code: code.clone(),
2561                        severity: diagnostic.severity.unwrap_or(DiagnosticSeverity::ERROR),
2562                        message: diagnostic.message.clone(),
2563                        group_id,
2564                        is_primary: true,
2565                        is_valid: true,
2566                        is_disk_based,
2567                        is_unnecessary,
2568                    },
2569                });
2570                if let Some(infos) = &diagnostic.related_information {
2571                    for info in infos {
2572                        if info.location.uri == params.uri && !info.message.is_empty() {
2573                            let range = range_from_lsp(info.location.range);
2574                            diagnostics.push(DiagnosticEntry {
2575                                range,
2576                                diagnostic: Diagnostic {
2577                                    code: code.clone(),
2578                                    severity: DiagnosticSeverity::INFORMATION,
2579                                    message: info.message.clone(),
2580                                    group_id,
2581                                    is_primary: false,
2582                                    is_valid: true,
2583                                    is_disk_based,
2584                                    is_unnecessary: false,
2585                                },
2586                            });
2587                        }
2588                    }
2589                }
2590            }
2591        }
2592
2593        for entry in &mut diagnostics {
2594            let diagnostic = &mut entry.diagnostic;
2595            if !diagnostic.is_primary {
2596                let source = *sources_by_group_id.get(&diagnostic.group_id).unwrap();
2597                if let Some(&(severity, is_unnecessary)) = supporting_diagnostics.get(&(
2598                    source,
2599                    diagnostic.code.clone(),
2600                    entry.range.clone(),
2601                )) {
2602                    if let Some(severity) = severity {
2603                        diagnostic.severity = severity;
2604                    }
2605                    diagnostic.is_unnecessary = is_unnecessary;
2606                }
2607            }
2608        }
2609
2610        self.update_diagnostic_entries(
2611            language_server_id,
2612            abs_path,
2613            params.version,
2614            diagnostics,
2615            cx,
2616        )?;
2617        Ok(())
2618    }
2619
2620    pub fn update_diagnostic_entries(
2621        &mut self,
2622        language_server_id: usize,
2623        abs_path: PathBuf,
2624        version: Option<i32>,
2625        diagnostics: Vec<DiagnosticEntry<Unclipped<PointUtf16>>>,
2626        cx: &mut ModelContext<Project>,
2627    ) -> Result<(), anyhow::Error> {
2628        let (worktree, relative_path) = self
2629            .find_local_worktree(&abs_path, cx)
2630            .ok_or_else(|| anyhow!("no worktree found for diagnostics"))?;
2631
2632        let project_path = ProjectPath {
2633            worktree_id: worktree.read(cx).id(),
2634            path: relative_path.into(),
2635        };
2636        if let Some(buffer) = self.get_open_buffer(&project_path, cx) {
2637            self.update_buffer_diagnostics(&buffer, diagnostics.clone(), version, cx)?;
2638        }
2639
2640        let updated = worktree.update(cx, |worktree, cx| {
2641            worktree
2642                .as_local_mut()
2643                .ok_or_else(|| anyhow!("not a local worktree"))?
2644                .update_diagnostics(
2645                    language_server_id,
2646                    project_path.path.clone(),
2647                    diagnostics,
2648                    cx,
2649                )
2650        })?;
2651        if updated {
2652            cx.emit(Event::DiagnosticsUpdated {
2653                language_server_id,
2654                path: project_path,
2655            });
2656        }
2657        Ok(())
2658    }
2659
2660    fn update_buffer_diagnostics(
2661        &mut self,
2662        buffer: &ModelHandle<Buffer>,
2663        mut diagnostics: Vec<DiagnosticEntry<Unclipped<PointUtf16>>>,
2664        version: Option<i32>,
2665        cx: &mut ModelContext<Self>,
2666    ) -> Result<()> {
2667        fn compare_diagnostics(a: &Diagnostic, b: &Diagnostic) -> Ordering {
2668            Ordering::Equal
2669                .then_with(|| b.is_primary.cmp(&a.is_primary))
2670                .then_with(|| a.is_disk_based.cmp(&b.is_disk_based))
2671                .then_with(|| a.severity.cmp(&b.severity))
2672                .then_with(|| a.message.cmp(&b.message))
2673        }
2674
2675        let snapshot = self.buffer_snapshot_for_lsp_version(buffer, version, cx)?;
2676
2677        diagnostics.sort_unstable_by(|a, b| {
2678            Ordering::Equal
2679                .then_with(|| a.range.start.cmp(&b.range.start))
2680                .then_with(|| b.range.end.cmp(&a.range.end))
2681                .then_with(|| compare_diagnostics(&a.diagnostic, &b.diagnostic))
2682        });
2683
2684        let mut sanitized_diagnostics = Vec::new();
2685        let edits_since_save = Patch::new(
2686            snapshot
2687                .edits_since::<Unclipped<PointUtf16>>(buffer.read(cx).saved_version())
2688                .collect(),
2689        );
2690        for entry in diagnostics {
2691            let start;
2692            let end;
2693            if entry.diagnostic.is_disk_based {
2694                // Some diagnostics are based on files on disk instead of buffers'
2695                // current contents. Adjust these diagnostics' ranges to reflect
2696                // any unsaved edits.
2697                start = edits_since_save.old_to_new(entry.range.start);
2698                end = edits_since_save.old_to_new(entry.range.end);
2699            } else {
2700                start = entry.range.start;
2701                end = entry.range.end;
2702            }
2703
2704            let mut range = snapshot.clip_point_utf16(start, Bias::Left)
2705                ..snapshot.clip_point_utf16(end, Bias::Right);
2706
2707            // Expand empty ranges by one codepoint
2708            if range.start == range.end {
2709                // This will be go to the next boundary when being clipped
2710                range.end.column += 1;
2711                range.end = snapshot.clip_point_utf16(Unclipped(range.end), Bias::Right);
2712                if range.start == range.end && range.end.column > 0 {
2713                    range.start.column -= 1;
2714                    range.end = snapshot.clip_point_utf16(Unclipped(range.end), Bias::Left);
2715                }
2716            }
2717
2718            sanitized_diagnostics.push(DiagnosticEntry {
2719                range,
2720                diagnostic: entry.diagnostic,
2721            });
2722        }
2723        drop(edits_since_save);
2724
2725        let set = DiagnosticSet::new(sanitized_diagnostics, &snapshot);
2726        buffer.update(cx, |buffer, cx| buffer.update_diagnostics(set, cx));
2727        Ok(())
2728    }
2729
2730    pub fn reload_buffers(
2731        &self,
2732        buffers: HashSet<ModelHandle<Buffer>>,
2733        push_to_history: bool,
2734        cx: &mut ModelContext<Self>,
2735    ) -> Task<Result<ProjectTransaction>> {
2736        let mut local_buffers = Vec::new();
2737        let mut remote_buffers = None;
2738        for buffer_handle in buffers {
2739            let buffer = buffer_handle.read(cx);
2740            if buffer.is_dirty() {
2741                if let Some(file) = File::from_dyn(buffer.file()) {
2742                    if file.is_local() {
2743                        local_buffers.push(buffer_handle);
2744                    } else {
2745                        remote_buffers.get_or_insert(Vec::new()).push(buffer_handle);
2746                    }
2747                }
2748            }
2749        }
2750
2751        let remote_buffers = self.remote_id().zip(remote_buffers);
2752        let client = self.client.clone();
2753
2754        cx.spawn(|this, mut cx| async move {
2755            let mut project_transaction = ProjectTransaction::default();
2756
2757            if let Some((project_id, remote_buffers)) = remote_buffers {
2758                let response = client
2759                    .request(proto::ReloadBuffers {
2760                        project_id,
2761                        buffer_ids: remote_buffers
2762                            .iter()
2763                            .map(|buffer| buffer.read_with(&cx, |buffer, _| buffer.remote_id()))
2764                            .collect(),
2765                    })
2766                    .await?
2767                    .transaction
2768                    .ok_or_else(|| anyhow!("missing transaction"))?;
2769                project_transaction = this
2770                    .update(&mut cx, |this, cx| {
2771                        this.deserialize_project_transaction(response, push_to_history, cx)
2772                    })
2773                    .await?;
2774            }
2775
2776            for buffer in local_buffers {
2777                let transaction = buffer
2778                    .update(&mut cx, |buffer, cx| buffer.reload(cx))
2779                    .await?;
2780                buffer.update(&mut cx, |buffer, cx| {
2781                    if let Some(transaction) = transaction {
2782                        if !push_to_history {
2783                            buffer.forget_transaction(transaction.id);
2784                        }
2785                        project_transaction.0.insert(cx.handle(), transaction);
2786                    }
2787                });
2788            }
2789
2790            Ok(project_transaction)
2791        })
2792    }
2793
2794    pub fn format(
2795        &self,
2796        buffers: HashSet<ModelHandle<Buffer>>,
2797        push_to_history: bool,
2798        trigger: FormatTrigger,
2799        cx: &mut ModelContext<Project>,
2800    ) -> Task<Result<ProjectTransaction>> {
2801        let mut local_buffers = Vec::new();
2802        let mut remote_buffers = None;
2803        for buffer_handle in buffers {
2804            let buffer = buffer_handle.read(cx);
2805            if let Some(file) = File::from_dyn(buffer.file()) {
2806                if let Some(buffer_abs_path) = file.as_local().map(|f| f.abs_path(cx)) {
2807                    if let Some((_, server)) = self.language_server_for_buffer(buffer, cx) {
2808                        local_buffers.push((buffer_handle, buffer_abs_path, server.clone()));
2809                    }
2810                } else {
2811                    remote_buffers.get_or_insert(Vec::new()).push(buffer_handle);
2812                }
2813            } else {
2814                return Task::ready(Ok(Default::default()));
2815            }
2816        }
2817
2818        let remote_buffers = self.remote_id().zip(remote_buffers);
2819        let client = self.client.clone();
2820
2821        cx.spawn(|this, mut cx| async move {
2822            let mut project_transaction = ProjectTransaction::default();
2823
2824            if let Some((project_id, remote_buffers)) = remote_buffers {
2825                let response = client
2826                    .request(proto::FormatBuffers {
2827                        project_id,
2828                        trigger: trigger as i32,
2829                        buffer_ids: remote_buffers
2830                            .iter()
2831                            .map(|buffer| buffer.read_with(&cx, |buffer, _| buffer.remote_id()))
2832                            .collect(),
2833                    })
2834                    .await?
2835                    .transaction
2836                    .ok_or_else(|| anyhow!("missing transaction"))?;
2837                project_transaction = this
2838                    .update(&mut cx, |this, cx| {
2839                        this.deserialize_project_transaction(response, push_to_history, cx)
2840                    })
2841                    .await?;
2842            }
2843
2844            // Do not allow multiple concurrent formatting requests for the
2845            // same buffer.
2846            this.update(&mut cx, |this, _| {
2847                local_buffers
2848                    .retain(|(buffer, _, _)| this.buffers_being_formatted.insert(buffer.id()));
2849            });
2850            let _cleanup = defer({
2851                let this = this.clone();
2852                let mut cx = cx.clone();
2853                let local_buffers = &local_buffers;
2854                move || {
2855                    this.update(&mut cx, |this, _| {
2856                        for (buffer, _, _) in local_buffers {
2857                            this.buffers_being_formatted.remove(&buffer.id());
2858                        }
2859                    });
2860                }
2861            });
2862
2863            for (buffer, buffer_abs_path, language_server) in &local_buffers {
2864                let (format_on_save, formatter, tab_size) = buffer.read_with(&cx, |buffer, cx| {
2865                    let settings = cx.global::<Settings>();
2866                    let language_name = buffer.language().map(|language| language.name());
2867                    (
2868                        settings.format_on_save(language_name.as_deref()),
2869                        settings.formatter(language_name.as_deref()),
2870                        settings.tab_size(language_name.as_deref()),
2871                    )
2872                });
2873
2874                let transaction = match (formatter, format_on_save) {
2875                    (_, FormatOnSave::Off) if trigger == FormatTrigger::Save => continue,
2876
2877                    (Formatter::LanguageServer, FormatOnSave::On | FormatOnSave::Off)
2878                    | (_, FormatOnSave::LanguageServer) => Self::format_via_lsp(
2879                        &this,
2880                        &buffer,
2881                        &buffer_abs_path,
2882                        &language_server,
2883                        tab_size,
2884                        &mut cx,
2885                    )
2886                    .await
2887                    .context("failed to format via language server")?,
2888
2889                    (
2890                        Formatter::External { command, arguments },
2891                        FormatOnSave::On | FormatOnSave::Off,
2892                    )
2893                    | (_, FormatOnSave::External { command, arguments }) => {
2894                        Self::format_via_external_command(
2895                            &buffer,
2896                            &buffer_abs_path,
2897                            &command,
2898                            &arguments,
2899                            &mut cx,
2900                        )
2901                        .await
2902                        .context(format!(
2903                            "failed to format via external command {:?}",
2904                            command
2905                        ))?
2906                    }
2907                };
2908
2909                if let Some(transaction) = transaction {
2910                    if !push_to_history {
2911                        buffer.update(&mut cx, |buffer, _| {
2912                            buffer.forget_transaction(transaction.id)
2913                        });
2914                    }
2915                    project_transaction.0.insert(buffer.clone(), transaction);
2916                }
2917            }
2918
2919            Ok(project_transaction)
2920        })
2921    }
2922
2923    async fn format_via_lsp(
2924        this: &ModelHandle<Self>,
2925        buffer: &ModelHandle<Buffer>,
2926        abs_path: &Path,
2927        language_server: &Arc<LanguageServer>,
2928        tab_size: NonZeroU32,
2929        cx: &mut AsyncAppContext,
2930    ) -> Result<Option<Transaction>> {
2931        let text_document =
2932            lsp::TextDocumentIdentifier::new(lsp::Url::from_file_path(abs_path).unwrap());
2933        let capabilities = &language_server.capabilities();
2934        let lsp_edits = if capabilities
2935            .document_formatting_provider
2936            .as_ref()
2937            .map_or(false, |provider| *provider != lsp::OneOf::Left(false))
2938        {
2939            language_server
2940                .request::<lsp::request::Formatting>(lsp::DocumentFormattingParams {
2941                    text_document,
2942                    options: lsp::FormattingOptions {
2943                        tab_size: tab_size.into(),
2944                        insert_spaces: true,
2945                        insert_final_newline: Some(true),
2946                        ..Default::default()
2947                    },
2948                    work_done_progress_params: Default::default(),
2949                })
2950                .await?
2951        } else if capabilities
2952            .document_range_formatting_provider
2953            .as_ref()
2954            .map_or(false, |provider| *provider != lsp::OneOf::Left(false))
2955        {
2956            let buffer_start = lsp::Position::new(0, 0);
2957            let buffer_end =
2958                buffer.read_with(cx, |buffer, _| point_to_lsp(buffer.max_point_utf16()));
2959            language_server
2960                .request::<lsp::request::RangeFormatting>(lsp::DocumentRangeFormattingParams {
2961                    text_document,
2962                    range: lsp::Range::new(buffer_start, buffer_end),
2963                    options: lsp::FormattingOptions {
2964                        tab_size: tab_size.into(),
2965                        insert_spaces: true,
2966                        insert_final_newline: Some(true),
2967                        ..Default::default()
2968                    },
2969                    work_done_progress_params: Default::default(),
2970                })
2971                .await?
2972        } else {
2973            None
2974        };
2975
2976        if let Some(lsp_edits) = lsp_edits {
2977            let edits = this
2978                .update(cx, |this, cx| {
2979                    this.edits_from_lsp(buffer, lsp_edits, None, cx)
2980                })
2981                .await?;
2982            buffer.update(cx, |buffer, cx| {
2983                buffer.finalize_last_transaction();
2984                buffer.start_transaction();
2985                for (range, text) in edits {
2986                    buffer.edit([(range, text)], None, cx);
2987                }
2988                if buffer.end_transaction(cx).is_some() {
2989                    let transaction = buffer.finalize_last_transaction().unwrap().clone();
2990                    Ok(Some(transaction))
2991                } else {
2992                    Ok(None)
2993                }
2994            })
2995        } else {
2996            Ok(None)
2997        }
2998    }
2999
3000    async fn format_via_external_command(
3001        buffer: &ModelHandle<Buffer>,
3002        buffer_abs_path: &Path,
3003        command: &str,
3004        arguments: &[String],
3005        cx: &mut AsyncAppContext,
3006    ) -> Result<Option<Transaction>> {
3007        let working_dir_path = buffer.read_with(cx, |buffer, cx| {
3008            let file = File::from_dyn(buffer.file())?;
3009            let worktree = file.worktree.read(cx).as_local()?;
3010            let mut worktree_path = worktree.abs_path().to_path_buf();
3011            if worktree.root_entry()?.is_file() {
3012                worktree_path.pop();
3013            }
3014            Some(worktree_path)
3015        });
3016
3017        if let Some(working_dir_path) = working_dir_path {
3018            let mut child =
3019                smol::process::Command::new(command)
3020                    .args(arguments.iter().map(|arg| {
3021                        arg.replace("{buffer_path}", &buffer_abs_path.to_string_lossy())
3022                    }))
3023                    .current_dir(&working_dir_path)
3024                    .stdin(smol::process::Stdio::piped())
3025                    .stdout(smol::process::Stdio::piped())
3026                    .stderr(smol::process::Stdio::piped())
3027                    .spawn()?;
3028            let stdin = child
3029                .stdin
3030                .as_mut()
3031                .ok_or_else(|| anyhow!("failed to acquire stdin"))?;
3032            let text = buffer.read_with(cx, |buffer, _| buffer.as_rope().clone());
3033            for chunk in text.chunks() {
3034                stdin.write_all(chunk.as_bytes()).await?;
3035            }
3036            stdin.flush().await?;
3037
3038            let output = child.output().await?;
3039            if !output.status.success() {
3040                return Err(anyhow!(
3041                    "command failed with exit code {:?}:\nstdout: {}\nstderr: {}",
3042                    output.status.code(),
3043                    String::from_utf8_lossy(&output.stdout),
3044                    String::from_utf8_lossy(&output.stderr),
3045                ));
3046            }
3047
3048            let stdout = String::from_utf8(output.stdout)?;
3049            let diff = buffer
3050                .read_with(cx, |buffer, cx| buffer.diff(stdout, cx))
3051                .await;
3052            Ok(buffer.update(cx, |buffer, cx| buffer.apply_diff(diff, cx).cloned()))
3053        } else {
3054            Ok(None)
3055        }
3056    }
3057
3058    pub fn definition<T: ToPointUtf16>(
3059        &self,
3060        buffer: &ModelHandle<Buffer>,
3061        position: T,
3062        cx: &mut ModelContext<Self>,
3063    ) -> Task<Result<Vec<LocationLink>>> {
3064        let position = position.to_point_utf16(buffer.read(cx));
3065        self.request_lsp(buffer.clone(), GetDefinition { position }, cx)
3066    }
3067
3068    pub fn type_definition<T: ToPointUtf16>(
3069        &self,
3070        buffer: &ModelHandle<Buffer>,
3071        position: T,
3072        cx: &mut ModelContext<Self>,
3073    ) -> Task<Result<Vec<LocationLink>>> {
3074        let position = position.to_point_utf16(buffer.read(cx));
3075        self.request_lsp(buffer.clone(), GetTypeDefinition { position }, cx)
3076    }
3077
3078    pub fn references<T: ToPointUtf16>(
3079        &self,
3080        buffer: &ModelHandle<Buffer>,
3081        position: T,
3082        cx: &mut ModelContext<Self>,
3083    ) -> Task<Result<Vec<Location>>> {
3084        let position = position.to_point_utf16(buffer.read(cx));
3085        self.request_lsp(buffer.clone(), GetReferences { position }, cx)
3086    }
3087
3088    pub fn document_highlights<T: ToPointUtf16>(
3089        &self,
3090        buffer: &ModelHandle<Buffer>,
3091        position: T,
3092        cx: &mut ModelContext<Self>,
3093    ) -> Task<Result<Vec<DocumentHighlight>>> {
3094        let position = position.to_point_utf16(buffer.read(cx));
3095        self.request_lsp(buffer.clone(), GetDocumentHighlights { position }, cx)
3096    }
3097
3098    pub fn symbols(&self, query: &str, cx: &mut ModelContext<Self>) -> Task<Result<Vec<Symbol>>> {
3099        if self.is_local() {
3100            let mut requests = Vec::new();
3101            for ((worktree_id, _), server_id) in self.language_server_ids.iter() {
3102                let worktree_id = *worktree_id;
3103                if let Some(worktree) = self
3104                    .worktree_for_id(worktree_id, cx)
3105                    .and_then(|worktree| worktree.read(cx).as_local())
3106                {
3107                    if let Some(LanguageServerState::Running {
3108                        adapter,
3109                        language,
3110                        server,
3111                    }) = self.language_servers.get(server_id)
3112                    {
3113                        let adapter = adapter.clone();
3114                        let language = language.clone();
3115                        let worktree_abs_path = worktree.abs_path().clone();
3116                        requests.push(
3117                            server
3118                                .request::<lsp::request::WorkspaceSymbol>(
3119                                    lsp::WorkspaceSymbolParams {
3120                                        query: query.to_string(),
3121                                        ..Default::default()
3122                                    },
3123                                )
3124                                .log_err()
3125                                .map(move |response| {
3126                                    (
3127                                        adapter,
3128                                        language,
3129                                        worktree_id,
3130                                        worktree_abs_path,
3131                                        response.unwrap_or_default(),
3132                                    )
3133                                }),
3134                        );
3135                    }
3136                }
3137            }
3138
3139            cx.spawn_weak(|this, cx| async move {
3140                let responses = futures::future::join_all(requests).await;
3141                let this = if let Some(this) = this.upgrade(&cx) {
3142                    this
3143                } else {
3144                    return Ok(Default::default());
3145                };
3146                let symbols = this.read_with(&cx, |this, cx| {
3147                    let mut symbols = Vec::new();
3148                    for (
3149                        adapter,
3150                        adapter_language,
3151                        source_worktree_id,
3152                        worktree_abs_path,
3153                        response,
3154                    ) in responses
3155                    {
3156                        symbols.extend(response.into_iter().flatten().filter_map(|lsp_symbol| {
3157                            let abs_path = lsp_symbol.location.uri.to_file_path().ok()?;
3158                            let mut worktree_id = source_worktree_id;
3159                            let path;
3160                            if let Some((worktree, rel_path)) =
3161                                this.find_local_worktree(&abs_path, cx)
3162                            {
3163                                worktree_id = worktree.read(cx).id();
3164                                path = rel_path;
3165                            } else {
3166                                path = relativize_path(&worktree_abs_path, &abs_path);
3167                            }
3168
3169                            let project_path = ProjectPath {
3170                                worktree_id,
3171                                path: path.into(),
3172                            };
3173                            let signature = this.symbol_signature(&project_path);
3174                            let language = this
3175                                .languages
3176                                .select_language(&project_path.path)
3177                                .unwrap_or(adapter_language.clone());
3178                            let language_server_name = adapter.name.clone();
3179                            Some(async move {
3180                                let label = language
3181                                    .label_for_symbol(&lsp_symbol.name, lsp_symbol.kind)
3182                                    .await;
3183
3184                                Symbol {
3185                                    language_server_name,
3186                                    source_worktree_id,
3187                                    path: project_path,
3188                                    label: label.unwrap_or_else(|| {
3189                                        CodeLabel::plain(lsp_symbol.name.clone(), None)
3190                                    }),
3191                                    kind: lsp_symbol.kind,
3192                                    name: lsp_symbol.name,
3193                                    range: range_from_lsp(lsp_symbol.location.range),
3194                                    signature,
3195                                }
3196                            })
3197                        }));
3198                    }
3199                    symbols
3200                });
3201                Ok(futures::future::join_all(symbols).await)
3202            })
3203        } else if let Some(project_id) = self.remote_id() {
3204            let request = self.client.request(proto::GetProjectSymbols {
3205                project_id,
3206                query: query.to_string(),
3207            });
3208            cx.spawn_weak(|this, cx| async move {
3209                let response = request.await?;
3210                let mut symbols = Vec::new();
3211                if let Some(this) = this.upgrade(&cx) {
3212                    let new_symbols = this.read_with(&cx, |this, _| {
3213                        response
3214                            .symbols
3215                            .into_iter()
3216                            .map(|symbol| this.deserialize_symbol(symbol))
3217                            .collect::<Vec<_>>()
3218                    });
3219                    symbols = futures::future::join_all(new_symbols)
3220                        .await
3221                        .into_iter()
3222                        .filter_map(|symbol| symbol.log_err())
3223                        .collect::<Vec<_>>();
3224                }
3225                Ok(symbols)
3226            })
3227        } else {
3228            Task::ready(Ok(Default::default()))
3229        }
3230    }
3231
3232    pub fn open_buffer_for_symbol(
3233        &mut self,
3234        symbol: &Symbol,
3235        cx: &mut ModelContext<Self>,
3236    ) -> Task<Result<ModelHandle<Buffer>>> {
3237        if self.is_local() {
3238            let language_server_id = if let Some(id) = self.language_server_ids.get(&(
3239                symbol.source_worktree_id,
3240                symbol.language_server_name.clone(),
3241            )) {
3242                *id
3243            } else {
3244                return Task::ready(Err(anyhow!(
3245                    "language server for worktree and language not found"
3246                )));
3247            };
3248
3249            let worktree_abs_path = if let Some(worktree_abs_path) = self
3250                .worktree_for_id(symbol.path.worktree_id, cx)
3251                .and_then(|worktree| worktree.read(cx).as_local())
3252                .map(|local_worktree| local_worktree.abs_path())
3253            {
3254                worktree_abs_path
3255            } else {
3256                return Task::ready(Err(anyhow!("worktree not found for symbol")));
3257            };
3258            let symbol_abs_path = worktree_abs_path.join(&symbol.path.path);
3259            let symbol_uri = if let Ok(uri) = lsp::Url::from_file_path(symbol_abs_path) {
3260                uri
3261            } else {
3262                return Task::ready(Err(anyhow!("invalid symbol path")));
3263            };
3264
3265            self.open_local_buffer_via_lsp(
3266                symbol_uri,
3267                language_server_id,
3268                symbol.language_server_name.clone(),
3269                cx,
3270            )
3271        } else if let Some(project_id) = self.remote_id() {
3272            let request = self.client.request(proto::OpenBufferForSymbol {
3273                project_id,
3274                symbol: Some(serialize_symbol(symbol)),
3275            });
3276            cx.spawn(|this, mut cx| async move {
3277                let response = request.await?;
3278                this.update(&mut cx, |this, cx| {
3279                    this.wait_for_buffer(response.buffer_id, cx)
3280                })
3281                .await
3282            })
3283        } else {
3284            Task::ready(Err(anyhow!("project does not have a remote id")))
3285        }
3286    }
3287
3288    pub fn hover<T: ToPointUtf16>(
3289        &self,
3290        buffer: &ModelHandle<Buffer>,
3291        position: T,
3292        cx: &mut ModelContext<Self>,
3293    ) -> Task<Result<Option<Hover>>> {
3294        let position = position.to_point_utf16(buffer.read(cx));
3295        self.request_lsp(buffer.clone(), GetHover { position }, cx)
3296    }
3297
3298    pub fn completions<T: ToPointUtf16>(
3299        &self,
3300        source_buffer_handle: &ModelHandle<Buffer>,
3301        position: T,
3302        cx: &mut ModelContext<Self>,
3303    ) -> Task<Result<Vec<Completion>>> {
3304        let source_buffer_handle = source_buffer_handle.clone();
3305        let source_buffer = source_buffer_handle.read(cx);
3306        let buffer_id = source_buffer.remote_id();
3307        let language = source_buffer.language().cloned();
3308        let worktree;
3309        let buffer_abs_path;
3310        if let Some(file) = File::from_dyn(source_buffer.file()) {
3311            worktree = file.worktree.clone();
3312            buffer_abs_path = file.as_local().map(|f| f.abs_path(cx));
3313        } else {
3314            return Task::ready(Ok(Default::default()));
3315        };
3316
3317        let position = Unclipped(position.to_point_utf16(source_buffer));
3318        let anchor = source_buffer.anchor_after(position);
3319
3320        if worktree.read(cx).as_local().is_some() {
3321            let buffer_abs_path = buffer_abs_path.unwrap();
3322            let lang_server =
3323                if let Some((_, server)) = self.language_server_for_buffer(source_buffer, cx) {
3324                    server.clone()
3325                } else {
3326                    return Task::ready(Ok(Default::default()));
3327                };
3328
3329            cx.spawn(|_, cx| async move {
3330                let completions = lang_server
3331                    .request::<lsp::request::Completion>(lsp::CompletionParams {
3332                        text_document_position: lsp::TextDocumentPositionParams::new(
3333                            lsp::TextDocumentIdentifier::new(
3334                                lsp::Url::from_file_path(buffer_abs_path).unwrap(),
3335                            ),
3336                            point_to_lsp(position.0),
3337                        ),
3338                        context: Default::default(),
3339                        work_done_progress_params: Default::default(),
3340                        partial_result_params: Default::default(),
3341                    })
3342                    .await
3343                    .context("lsp completion request failed")?;
3344
3345                let completions = if let Some(completions) = completions {
3346                    match completions {
3347                        lsp::CompletionResponse::Array(completions) => completions,
3348                        lsp::CompletionResponse::List(list) => list.items,
3349                    }
3350                } else {
3351                    Default::default()
3352                };
3353
3354                let completions = source_buffer_handle.read_with(&cx, |this, _| {
3355                    let snapshot = this.snapshot();
3356                    let clipped_position = this.clip_point_utf16(position, Bias::Left);
3357                    let mut range_for_token = None;
3358                    completions
3359                        .into_iter()
3360                        .filter_map(move |mut lsp_completion| {
3361                            // For now, we can only handle additional edits if they are returned
3362                            // when resolving the completion, not if they are present initially.
3363                            if lsp_completion
3364                                .additional_text_edits
3365                                .as_ref()
3366                                .map_or(false, |edits| !edits.is_empty())
3367                            {
3368                                return None;
3369                            }
3370
3371                            let (old_range, mut new_text) = match lsp_completion.text_edit.as_ref()
3372                            {
3373                                // If the language server provides a range to overwrite, then
3374                                // check that the range is valid.
3375                                Some(lsp::CompletionTextEdit::Edit(edit)) => {
3376                                    let range = range_from_lsp(edit.range);
3377                                    let start = snapshot.clip_point_utf16(range.start, Bias::Left);
3378                                    let end = snapshot.clip_point_utf16(range.end, Bias::Left);
3379                                    if start != range.start.0 || end != range.end.0 {
3380                                        log::info!("completion out of expected range");
3381                                        return None;
3382                                    }
3383                                    (
3384                                        snapshot.anchor_before(start)..snapshot.anchor_after(end),
3385                                        edit.new_text.clone(),
3386                                    )
3387                                }
3388                                // If the language server does not provide a range, then infer
3389                                // the range based on the syntax tree.
3390                                None => {
3391                                    if position.0 != clipped_position {
3392                                        log::info!("completion out of expected range");
3393                                        return None;
3394                                    }
3395                                    let Range { start, end } = range_for_token
3396                                        .get_or_insert_with(|| {
3397                                            let offset = position.to_offset(&snapshot);
3398                                            let (range, kind) = snapshot.surrounding_word(offset);
3399                                            if kind == Some(CharKind::Word) {
3400                                                range
3401                                            } else {
3402                                                offset..offset
3403                                            }
3404                                        })
3405                                        .clone();
3406                                    let text = lsp_completion
3407                                        .insert_text
3408                                        .as_ref()
3409                                        .unwrap_or(&lsp_completion.label)
3410                                        .clone();
3411                                    (
3412                                        snapshot.anchor_before(start)..snapshot.anchor_after(end),
3413                                        text,
3414                                    )
3415                                }
3416                                Some(lsp::CompletionTextEdit::InsertAndReplace(_)) => {
3417                                    log::info!("unsupported insert/replace completion");
3418                                    return None;
3419                                }
3420                            };
3421
3422                            LineEnding::normalize(&mut new_text);
3423                            let language = language.clone();
3424                            Some(async move {
3425                                let mut label = None;
3426                                if let Some(language) = language {
3427                                    language.process_completion(&mut lsp_completion).await;
3428                                    label = language.label_for_completion(&lsp_completion).await;
3429                                }
3430                                Completion {
3431                                    old_range,
3432                                    new_text,
3433                                    label: label.unwrap_or_else(|| {
3434                                        CodeLabel::plain(
3435                                            lsp_completion.label.clone(),
3436                                            lsp_completion.filter_text.as_deref(),
3437                                        )
3438                                    }),
3439                                    lsp_completion,
3440                                }
3441                            })
3442                        })
3443                });
3444
3445                Ok(futures::future::join_all(completions).await)
3446            })
3447        } else if let Some(project_id) = self.remote_id() {
3448            let rpc = self.client.clone();
3449            let message = proto::GetCompletions {
3450                project_id,
3451                buffer_id,
3452                position: Some(language::proto::serialize_anchor(&anchor)),
3453                version: serialize_version(&source_buffer.version()),
3454            };
3455            cx.spawn_weak(|this, mut cx| async move {
3456                let response = rpc.request(message).await?;
3457
3458                if this
3459                    .upgrade(&cx)
3460                    .ok_or_else(|| anyhow!("project was dropped"))?
3461                    .read_with(&cx, |this, _| this.is_read_only())
3462                {
3463                    return Err(anyhow!(
3464                        "failed to get completions: project was disconnected"
3465                    ));
3466                } else {
3467                    source_buffer_handle
3468                        .update(&mut cx, |buffer, _| {
3469                            buffer.wait_for_version(deserialize_version(response.version))
3470                        })
3471                        .await;
3472
3473                    let completions = response.completions.into_iter().map(|completion| {
3474                        language::proto::deserialize_completion(completion, language.clone())
3475                    });
3476                    futures::future::try_join_all(completions).await
3477                }
3478            })
3479        } else {
3480            Task::ready(Ok(Default::default()))
3481        }
3482    }
3483
3484    pub fn apply_additional_edits_for_completion(
3485        &self,
3486        buffer_handle: ModelHandle<Buffer>,
3487        completion: Completion,
3488        push_to_history: bool,
3489        cx: &mut ModelContext<Self>,
3490    ) -> Task<Result<Option<Transaction>>> {
3491        let buffer = buffer_handle.read(cx);
3492        let buffer_id = buffer.remote_id();
3493
3494        if self.is_local() {
3495            let lang_server = match self.language_server_for_buffer(buffer, cx) {
3496                Some((_, server)) => server.clone(),
3497                _ => return Task::ready(Ok(Default::default())),
3498            };
3499
3500            cx.spawn(|this, mut cx| async move {
3501                let resolved_completion = lang_server
3502                    .request::<lsp::request::ResolveCompletionItem>(completion.lsp_completion)
3503                    .await?;
3504
3505                if let Some(edits) = resolved_completion.additional_text_edits {
3506                    let edits = this
3507                        .update(&mut cx, |this, cx| {
3508                            this.edits_from_lsp(&buffer_handle, edits, None, cx)
3509                        })
3510                        .await?;
3511
3512                    buffer_handle.update(&mut cx, |buffer, cx| {
3513                        buffer.finalize_last_transaction();
3514                        buffer.start_transaction();
3515
3516                        for (range, text) in edits {
3517                            let primary = &completion.old_range;
3518                            let start_within = primary.start.cmp(&range.start, buffer).is_le()
3519                                && primary.end.cmp(&range.start, buffer).is_ge();
3520                            let end_within = range.start.cmp(&primary.end, buffer).is_le()
3521                                && range.end.cmp(&primary.end, buffer).is_ge();
3522
3523                            //Skip addtional edits which overlap with the primary completion edit
3524                            //https://github.com/zed-industries/zed/pull/1871
3525                            if !start_within && !end_within {
3526                                buffer.edit([(range, text)], None, cx);
3527                            }
3528                        }
3529
3530                        let transaction = if buffer.end_transaction(cx).is_some() {
3531                            let transaction = buffer.finalize_last_transaction().unwrap().clone();
3532                            if !push_to_history {
3533                                buffer.forget_transaction(transaction.id);
3534                            }
3535                            Some(transaction)
3536                        } else {
3537                            None
3538                        };
3539                        Ok(transaction)
3540                    })
3541                } else {
3542                    Ok(None)
3543                }
3544            })
3545        } else if let Some(project_id) = self.remote_id() {
3546            let client = self.client.clone();
3547            cx.spawn(|_, mut cx| async move {
3548                let response = client
3549                    .request(proto::ApplyCompletionAdditionalEdits {
3550                        project_id,
3551                        buffer_id,
3552                        completion: Some(language::proto::serialize_completion(&completion)),
3553                    })
3554                    .await?;
3555
3556                if let Some(transaction) = response.transaction {
3557                    let transaction = language::proto::deserialize_transaction(transaction)?;
3558                    buffer_handle
3559                        .update(&mut cx, |buffer, _| {
3560                            buffer.wait_for_edits(transaction.edit_ids.iter().copied())
3561                        })
3562                        .await;
3563                    if push_to_history {
3564                        buffer_handle.update(&mut cx, |buffer, _| {
3565                            buffer.push_transaction(transaction.clone(), Instant::now());
3566                        });
3567                    }
3568                    Ok(Some(transaction))
3569                } else {
3570                    Ok(None)
3571                }
3572            })
3573        } else {
3574            Task::ready(Err(anyhow!("project does not have a remote id")))
3575        }
3576    }
3577
3578    pub fn code_actions<T: Clone + ToOffset>(
3579        &self,
3580        buffer_handle: &ModelHandle<Buffer>,
3581        range: Range<T>,
3582        cx: &mut ModelContext<Self>,
3583    ) -> Task<Result<Vec<CodeAction>>> {
3584        let buffer_handle = buffer_handle.clone();
3585        let buffer = buffer_handle.read(cx);
3586        let snapshot = buffer.snapshot();
3587        let relevant_diagnostics = snapshot
3588            .diagnostics_in_range::<usize, usize>(range.to_offset(&snapshot), false)
3589            .map(|entry| entry.to_lsp_diagnostic_stub())
3590            .collect();
3591        let buffer_id = buffer.remote_id();
3592        let worktree;
3593        let buffer_abs_path;
3594        if let Some(file) = File::from_dyn(buffer.file()) {
3595            worktree = file.worktree.clone();
3596            buffer_abs_path = file.as_local().map(|f| f.abs_path(cx));
3597        } else {
3598            return Task::ready(Ok(Default::default()));
3599        };
3600        let range = buffer.anchor_before(range.start)..buffer.anchor_before(range.end);
3601
3602        if worktree.read(cx).as_local().is_some() {
3603            let buffer_abs_path = buffer_abs_path.unwrap();
3604            let lang_server = if let Some((_, server)) = self.language_server_for_buffer(buffer, cx)
3605            {
3606                server.clone()
3607            } else {
3608                return Task::ready(Ok(Default::default()));
3609            };
3610
3611            let lsp_range = range_to_lsp(range.to_point_utf16(buffer));
3612            cx.foreground().spawn(async move {
3613                if lang_server.capabilities().code_action_provider.is_none() {
3614                    return Ok(Default::default());
3615                }
3616
3617                Ok(lang_server
3618                    .request::<lsp::request::CodeActionRequest>(lsp::CodeActionParams {
3619                        text_document: lsp::TextDocumentIdentifier::new(
3620                            lsp::Url::from_file_path(buffer_abs_path).unwrap(),
3621                        ),
3622                        range: lsp_range,
3623                        work_done_progress_params: Default::default(),
3624                        partial_result_params: Default::default(),
3625                        context: lsp::CodeActionContext {
3626                            diagnostics: relevant_diagnostics,
3627                            only: Some(vec![
3628                                lsp::CodeActionKind::EMPTY,
3629                                lsp::CodeActionKind::QUICKFIX,
3630                                lsp::CodeActionKind::REFACTOR,
3631                                lsp::CodeActionKind::REFACTOR_EXTRACT,
3632                                lsp::CodeActionKind::SOURCE,
3633                            ]),
3634                        },
3635                    })
3636                    .await?
3637                    .unwrap_or_default()
3638                    .into_iter()
3639                    .filter_map(|entry| {
3640                        if let lsp::CodeActionOrCommand::CodeAction(lsp_action) = entry {
3641                            Some(CodeAction {
3642                                range: range.clone(),
3643                                lsp_action,
3644                            })
3645                        } else {
3646                            None
3647                        }
3648                    })
3649                    .collect())
3650            })
3651        } else if let Some(project_id) = self.remote_id() {
3652            let rpc = self.client.clone();
3653            let version = buffer.version();
3654            cx.spawn_weak(|this, mut cx| async move {
3655                let response = rpc
3656                    .request(proto::GetCodeActions {
3657                        project_id,
3658                        buffer_id,
3659                        start: Some(language::proto::serialize_anchor(&range.start)),
3660                        end: Some(language::proto::serialize_anchor(&range.end)),
3661                        version: serialize_version(&version),
3662                    })
3663                    .await?;
3664
3665                if this
3666                    .upgrade(&cx)
3667                    .ok_or_else(|| anyhow!("project was dropped"))?
3668                    .read_with(&cx, |this, _| this.is_read_only())
3669                {
3670                    return Err(anyhow!(
3671                        "failed to get code actions: project was disconnected"
3672                    ));
3673                } else {
3674                    buffer_handle
3675                        .update(&mut cx, |buffer, _| {
3676                            buffer.wait_for_version(deserialize_version(response.version))
3677                        })
3678                        .await;
3679
3680                    response
3681                        .actions
3682                        .into_iter()
3683                        .map(language::proto::deserialize_code_action)
3684                        .collect()
3685                }
3686            })
3687        } else {
3688            Task::ready(Ok(Default::default()))
3689        }
3690    }
3691
3692    pub fn apply_code_action(
3693        &self,
3694        buffer_handle: ModelHandle<Buffer>,
3695        mut action: CodeAction,
3696        push_to_history: bool,
3697        cx: &mut ModelContext<Self>,
3698    ) -> Task<Result<ProjectTransaction>> {
3699        if self.is_local() {
3700            let buffer = buffer_handle.read(cx);
3701            let (lsp_adapter, lang_server) =
3702                if let Some((adapter, server)) = self.language_server_for_buffer(buffer, cx) {
3703                    (adapter.clone(), server.clone())
3704                } else {
3705                    return Task::ready(Ok(Default::default()));
3706                };
3707            let range = action.range.to_point_utf16(buffer);
3708
3709            cx.spawn(|this, mut cx| async move {
3710                if let Some(lsp_range) = action
3711                    .lsp_action
3712                    .data
3713                    .as_mut()
3714                    .and_then(|d| d.get_mut("codeActionParams"))
3715                    .and_then(|d| d.get_mut("range"))
3716                {
3717                    *lsp_range = serde_json::to_value(&range_to_lsp(range)).unwrap();
3718                    action.lsp_action = lang_server
3719                        .request::<lsp::request::CodeActionResolveRequest>(action.lsp_action)
3720                        .await?;
3721                } else {
3722                    let actions = this
3723                        .update(&mut cx, |this, cx| {
3724                            this.code_actions(&buffer_handle, action.range, cx)
3725                        })
3726                        .await?;
3727                    action.lsp_action = actions
3728                        .into_iter()
3729                        .find(|a| a.lsp_action.title == action.lsp_action.title)
3730                        .ok_or_else(|| anyhow!("code action is outdated"))?
3731                        .lsp_action;
3732                }
3733
3734                if let Some(edit) = action.lsp_action.edit {
3735                    if edit.changes.is_some() || edit.document_changes.is_some() {
3736                        return Self::deserialize_workspace_edit(
3737                            this,
3738                            edit,
3739                            push_to_history,
3740                            lsp_adapter.clone(),
3741                            lang_server.clone(),
3742                            &mut cx,
3743                        )
3744                        .await;
3745                    }
3746                }
3747
3748                if let Some(command) = action.lsp_action.command {
3749                    this.update(&mut cx, |this, _| {
3750                        this.last_workspace_edits_by_language_server
3751                            .remove(&lang_server.server_id());
3752                    });
3753                    lang_server
3754                        .request::<lsp::request::ExecuteCommand>(lsp::ExecuteCommandParams {
3755                            command: command.command,
3756                            arguments: command.arguments.unwrap_or_default(),
3757                            ..Default::default()
3758                        })
3759                        .await?;
3760                    return Ok(this.update(&mut cx, |this, _| {
3761                        this.last_workspace_edits_by_language_server
3762                            .remove(&lang_server.server_id())
3763                            .unwrap_or_default()
3764                    }));
3765                }
3766
3767                Ok(ProjectTransaction::default())
3768            })
3769        } else if let Some(project_id) = self.remote_id() {
3770            let client = self.client.clone();
3771            let request = proto::ApplyCodeAction {
3772                project_id,
3773                buffer_id: buffer_handle.read(cx).remote_id(),
3774                action: Some(language::proto::serialize_code_action(&action)),
3775            };
3776            cx.spawn(|this, mut cx| async move {
3777                let response = client
3778                    .request(request)
3779                    .await?
3780                    .transaction
3781                    .ok_or_else(|| anyhow!("missing transaction"))?;
3782                this.update(&mut cx, |this, cx| {
3783                    this.deserialize_project_transaction(response, push_to_history, cx)
3784                })
3785                .await
3786            })
3787        } else {
3788            Task::ready(Err(anyhow!("project does not have a remote id")))
3789        }
3790    }
3791
3792    async fn deserialize_workspace_edit(
3793        this: ModelHandle<Self>,
3794        edit: lsp::WorkspaceEdit,
3795        push_to_history: bool,
3796        lsp_adapter: Arc<CachedLspAdapter>,
3797        language_server: Arc<LanguageServer>,
3798        cx: &mut AsyncAppContext,
3799    ) -> Result<ProjectTransaction> {
3800        let fs = this.read_with(cx, |this, _| this.fs.clone());
3801        let mut operations = Vec::new();
3802        if let Some(document_changes) = edit.document_changes {
3803            match document_changes {
3804                lsp::DocumentChanges::Edits(edits) => {
3805                    operations.extend(edits.into_iter().map(lsp::DocumentChangeOperation::Edit))
3806                }
3807                lsp::DocumentChanges::Operations(ops) => operations = ops,
3808            }
3809        } else if let Some(changes) = edit.changes {
3810            operations.extend(changes.into_iter().map(|(uri, edits)| {
3811                lsp::DocumentChangeOperation::Edit(lsp::TextDocumentEdit {
3812                    text_document: lsp::OptionalVersionedTextDocumentIdentifier {
3813                        uri,
3814                        version: None,
3815                    },
3816                    edits: edits.into_iter().map(lsp::OneOf::Left).collect(),
3817                })
3818            }));
3819        }
3820
3821        let mut project_transaction = ProjectTransaction::default();
3822        for operation in operations {
3823            match operation {
3824                lsp::DocumentChangeOperation::Op(lsp::ResourceOp::Create(op)) => {
3825                    let abs_path = op
3826                        .uri
3827                        .to_file_path()
3828                        .map_err(|_| anyhow!("can't convert URI to path"))?;
3829
3830                    if let Some(parent_path) = abs_path.parent() {
3831                        fs.create_dir(parent_path).await?;
3832                    }
3833                    if abs_path.ends_with("/") {
3834                        fs.create_dir(&abs_path).await?;
3835                    } else {
3836                        fs.create_file(&abs_path, op.options.map(Into::into).unwrap_or_default())
3837                            .await?;
3838                    }
3839                }
3840                lsp::DocumentChangeOperation::Op(lsp::ResourceOp::Rename(op)) => {
3841                    let source_abs_path = op
3842                        .old_uri
3843                        .to_file_path()
3844                        .map_err(|_| anyhow!("can't convert URI to path"))?;
3845                    let target_abs_path = op
3846                        .new_uri
3847                        .to_file_path()
3848                        .map_err(|_| anyhow!("can't convert URI to path"))?;
3849                    fs.rename(
3850                        &source_abs_path,
3851                        &target_abs_path,
3852                        op.options.map(Into::into).unwrap_or_default(),
3853                    )
3854                    .await?;
3855                }
3856                lsp::DocumentChangeOperation::Op(lsp::ResourceOp::Delete(op)) => {
3857                    let abs_path = op
3858                        .uri
3859                        .to_file_path()
3860                        .map_err(|_| anyhow!("can't convert URI to path"))?;
3861                    let options = op.options.map(Into::into).unwrap_or_default();
3862                    if abs_path.ends_with("/") {
3863                        fs.remove_dir(&abs_path, options).await?;
3864                    } else {
3865                        fs.remove_file(&abs_path, options).await?;
3866                    }
3867                }
3868                lsp::DocumentChangeOperation::Edit(op) => {
3869                    let buffer_to_edit = this
3870                        .update(cx, |this, cx| {
3871                            this.open_local_buffer_via_lsp(
3872                                op.text_document.uri,
3873                                language_server.server_id(),
3874                                lsp_adapter.name.clone(),
3875                                cx,
3876                            )
3877                        })
3878                        .await?;
3879
3880                    let edits = this
3881                        .update(cx, |this, cx| {
3882                            let edits = op.edits.into_iter().map(|edit| match edit {
3883                                lsp::OneOf::Left(edit) => edit,
3884                                lsp::OneOf::Right(edit) => edit.text_edit,
3885                            });
3886                            this.edits_from_lsp(
3887                                &buffer_to_edit,
3888                                edits,
3889                                op.text_document.version,
3890                                cx,
3891                            )
3892                        })
3893                        .await?;
3894
3895                    let transaction = buffer_to_edit.update(cx, |buffer, cx| {
3896                        buffer.finalize_last_transaction();
3897                        buffer.start_transaction();
3898                        for (range, text) in edits {
3899                            buffer.edit([(range, text)], None, cx);
3900                        }
3901                        let transaction = if buffer.end_transaction(cx).is_some() {
3902                            let transaction = buffer.finalize_last_transaction().unwrap().clone();
3903                            if !push_to_history {
3904                                buffer.forget_transaction(transaction.id);
3905                            }
3906                            Some(transaction)
3907                        } else {
3908                            None
3909                        };
3910
3911                        transaction
3912                    });
3913                    if let Some(transaction) = transaction {
3914                        project_transaction.0.insert(buffer_to_edit, transaction);
3915                    }
3916                }
3917            }
3918        }
3919
3920        Ok(project_transaction)
3921    }
3922
3923    pub fn prepare_rename<T: ToPointUtf16>(
3924        &self,
3925        buffer: ModelHandle<Buffer>,
3926        position: T,
3927        cx: &mut ModelContext<Self>,
3928    ) -> Task<Result<Option<Range<Anchor>>>> {
3929        let position = position.to_point_utf16(buffer.read(cx));
3930        self.request_lsp(buffer, PrepareRename { position }, cx)
3931    }
3932
3933    pub fn perform_rename<T: ToPointUtf16>(
3934        &self,
3935        buffer: ModelHandle<Buffer>,
3936        position: T,
3937        new_name: String,
3938        push_to_history: bool,
3939        cx: &mut ModelContext<Self>,
3940    ) -> Task<Result<ProjectTransaction>> {
3941        let position = position.to_point_utf16(buffer.read(cx));
3942        self.request_lsp(
3943            buffer,
3944            PerformRename {
3945                position,
3946                new_name,
3947                push_to_history,
3948            },
3949            cx,
3950        )
3951    }
3952
3953    #[allow(clippy::type_complexity)]
3954    pub fn search(
3955        &self,
3956        query: SearchQuery,
3957        cx: &mut ModelContext<Self>,
3958    ) -> Task<Result<HashMap<ModelHandle<Buffer>, Vec<Range<Anchor>>>>> {
3959        if self.is_local() {
3960            let snapshots = self
3961                .visible_worktrees(cx)
3962                .filter_map(|tree| {
3963                    let tree = tree.read(cx).as_local()?;
3964                    Some(tree.snapshot())
3965                })
3966                .collect::<Vec<_>>();
3967
3968            let background = cx.background().clone();
3969            let path_count: usize = snapshots.iter().map(|s| s.visible_file_count()).sum();
3970            if path_count == 0 {
3971                return Task::ready(Ok(Default::default()));
3972            }
3973            let workers = background.num_cpus().min(path_count);
3974            let (matching_paths_tx, mut matching_paths_rx) = smol::channel::bounded(1024);
3975            cx.background()
3976                .spawn({
3977                    let fs = self.fs.clone();
3978                    let background = cx.background().clone();
3979                    let query = query.clone();
3980                    async move {
3981                        let fs = &fs;
3982                        let query = &query;
3983                        let matching_paths_tx = &matching_paths_tx;
3984                        let paths_per_worker = (path_count + workers - 1) / workers;
3985                        let snapshots = &snapshots;
3986                        background
3987                            .scoped(|scope| {
3988                                for worker_ix in 0..workers {
3989                                    let worker_start_ix = worker_ix * paths_per_worker;
3990                                    let worker_end_ix = worker_start_ix + paths_per_worker;
3991                                    scope.spawn(async move {
3992                                        let mut snapshot_start_ix = 0;
3993                                        let mut abs_path = PathBuf::new();
3994                                        for snapshot in snapshots {
3995                                            let snapshot_end_ix =
3996                                                snapshot_start_ix + snapshot.visible_file_count();
3997                                            if worker_end_ix <= snapshot_start_ix {
3998                                                break;
3999                                            } else if worker_start_ix > snapshot_end_ix {
4000                                                snapshot_start_ix = snapshot_end_ix;
4001                                                continue;
4002                                            } else {
4003                                                let start_in_snapshot = worker_start_ix
4004                                                    .saturating_sub(snapshot_start_ix);
4005                                                let end_in_snapshot =
4006                                                    cmp::min(worker_end_ix, snapshot_end_ix)
4007                                                        - snapshot_start_ix;
4008
4009                                                for entry in snapshot
4010                                                    .files(false, start_in_snapshot)
4011                                                    .take(end_in_snapshot - start_in_snapshot)
4012                                                {
4013                                                    if matching_paths_tx.is_closed() {
4014                                                        break;
4015                                                    }
4016
4017                                                    abs_path.clear();
4018                                                    abs_path.push(&snapshot.abs_path());
4019                                                    abs_path.push(&entry.path);
4020                                                    let matches = if let Some(file) =
4021                                                        fs.open_sync(&abs_path).await.log_err()
4022                                                    {
4023                                                        query.detect(file).unwrap_or(false)
4024                                                    } else {
4025                                                        false
4026                                                    };
4027
4028                                                    if matches {
4029                                                        let project_path =
4030                                                            (snapshot.id(), entry.path.clone());
4031                                                        if matching_paths_tx
4032                                                            .send(project_path)
4033                                                            .await
4034                                                            .is_err()
4035                                                        {
4036                                                            break;
4037                                                        }
4038                                                    }
4039                                                }
4040
4041                                                snapshot_start_ix = snapshot_end_ix;
4042                                            }
4043                                        }
4044                                    });
4045                                }
4046                            })
4047                            .await;
4048                    }
4049                })
4050                .detach();
4051
4052            let (buffers_tx, buffers_rx) = smol::channel::bounded(1024);
4053            let open_buffers = self
4054                .opened_buffers
4055                .values()
4056                .filter_map(|b| b.upgrade(cx))
4057                .collect::<HashSet<_>>();
4058            cx.spawn(|this, cx| async move {
4059                for buffer in &open_buffers {
4060                    let snapshot = buffer.read_with(&cx, |buffer, _| buffer.snapshot());
4061                    buffers_tx.send((buffer.clone(), snapshot)).await?;
4062                }
4063
4064                let open_buffers = Rc::new(RefCell::new(open_buffers));
4065                while let Some(project_path) = matching_paths_rx.next().await {
4066                    if buffers_tx.is_closed() {
4067                        break;
4068                    }
4069
4070                    let this = this.clone();
4071                    let open_buffers = open_buffers.clone();
4072                    let buffers_tx = buffers_tx.clone();
4073                    cx.spawn(|mut cx| async move {
4074                        if let Some(buffer) = this
4075                            .update(&mut cx, |this, cx| this.open_buffer(project_path, cx))
4076                            .await
4077                            .log_err()
4078                        {
4079                            if open_buffers.borrow_mut().insert(buffer.clone()) {
4080                                let snapshot = buffer.read_with(&cx, |buffer, _| buffer.snapshot());
4081                                buffers_tx.send((buffer, snapshot)).await?;
4082                            }
4083                        }
4084
4085                        Ok::<_, anyhow::Error>(())
4086                    })
4087                    .detach();
4088                }
4089
4090                Ok::<_, anyhow::Error>(())
4091            })
4092            .detach_and_log_err(cx);
4093
4094            let background = cx.background().clone();
4095            cx.background().spawn(async move {
4096                let query = &query;
4097                let mut matched_buffers = Vec::new();
4098                for _ in 0..workers {
4099                    matched_buffers.push(HashMap::default());
4100                }
4101                background
4102                    .scoped(|scope| {
4103                        for worker_matched_buffers in matched_buffers.iter_mut() {
4104                            let mut buffers_rx = buffers_rx.clone();
4105                            scope.spawn(async move {
4106                                while let Some((buffer, snapshot)) = buffers_rx.next().await {
4107                                    let buffer_matches = query
4108                                        .search(snapshot.as_rope())
4109                                        .await
4110                                        .iter()
4111                                        .map(|range| {
4112                                            snapshot.anchor_before(range.start)
4113                                                ..snapshot.anchor_after(range.end)
4114                                        })
4115                                        .collect::<Vec<_>>();
4116                                    if !buffer_matches.is_empty() {
4117                                        worker_matched_buffers
4118                                            .insert(buffer.clone(), buffer_matches);
4119                                    }
4120                                }
4121                            });
4122                        }
4123                    })
4124                    .await;
4125                Ok(matched_buffers.into_iter().flatten().collect())
4126            })
4127        } else if let Some(project_id) = self.remote_id() {
4128            let request = self.client.request(query.to_proto(project_id));
4129            cx.spawn(|this, mut cx| async move {
4130                let response = request.await?;
4131                let mut result = HashMap::default();
4132                for location in response.locations {
4133                    let target_buffer = this
4134                        .update(&mut cx, |this, cx| {
4135                            this.wait_for_buffer(location.buffer_id, cx)
4136                        })
4137                        .await?;
4138                    let start = location
4139                        .start
4140                        .and_then(deserialize_anchor)
4141                        .ok_or_else(|| anyhow!("missing target start"))?;
4142                    let end = location
4143                        .end
4144                        .and_then(deserialize_anchor)
4145                        .ok_or_else(|| anyhow!("missing target end"))?;
4146                    result
4147                        .entry(target_buffer)
4148                        .or_insert(Vec::new())
4149                        .push(start..end)
4150                }
4151                Ok(result)
4152            })
4153        } else {
4154            Task::ready(Ok(Default::default()))
4155        }
4156    }
4157
4158    fn request_lsp<R: LspCommand>(
4159        &self,
4160        buffer_handle: ModelHandle<Buffer>,
4161        request: R,
4162        cx: &mut ModelContext<Self>,
4163    ) -> Task<Result<R::Response>>
4164    where
4165        <R::LspRequest as lsp::request::Request>::Result: Send,
4166    {
4167        let buffer = buffer_handle.read(cx);
4168        if self.is_local() {
4169            let file = File::from_dyn(buffer.file()).and_then(File::as_local);
4170            if let Some((file, language_server)) = file.zip(
4171                self.language_server_for_buffer(buffer, cx)
4172                    .map(|(_, server)| server.clone()),
4173            ) {
4174                let lsp_params = request.to_lsp(&file.abs_path(cx), cx);
4175                return cx.spawn(|this, cx| async move {
4176                    if !request.check_capabilities(language_server.capabilities()) {
4177                        return Ok(Default::default());
4178                    }
4179
4180                    let response = language_server
4181                        .request::<R::LspRequest>(lsp_params)
4182                        .await
4183                        .context("lsp request failed")?;
4184                    request
4185                        .response_from_lsp(response, this, buffer_handle, cx)
4186                        .await
4187                });
4188            }
4189        } else if let Some(project_id) = self.remote_id() {
4190            let rpc = self.client.clone();
4191            let message = request.to_proto(project_id, buffer);
4192            return cx.spawn(|this, cx| async move {
4193                let response = rpc.request(message).await?;
4194                if this.read_with(&cx, |this, _| this.is_read_only()) {
4195                    Err(anyhow!("disconnected before completing request"))
4196                } else {
4197                    request
4198                        .response_from_proto(response, this, buffer_handle, cx)
4199                        .await
4200                }
4201            });
4202        }
4203        Task::ready(Ok(Default::default()))
4204    }
4205
4206    pub fn find_or_create_local_worktree(
4207        &mut self,
4208        abs_path: impl AsRef<Path>,
4209        visible: bool,
4210        cx: &mut ModelContext<Self>,
4211    ) -> Task<Result<(ModelHandle<Worktree>, PathBuf)>> {
4212        let abs_path = abs_path.as_ref();
4213        if let Some((tree, relative_path)) = self.find_local_worktree(abs_path, cx) {
4214            Task::ready(Ok((tree, relative_path)))
4215        } else {
4216            let worktree = self.create_local_worktree(abs_path, visible, cx);
4217            cx.foreground()
4218                .spawn(async move { Ok((worktree.await?, PathBuf::new())) })
4219        }
4220    }
4221
4222    pub fn find_local_worktree(
4223        &self,
4224        abs_path: &Path,
4225        cx: &AppContext,
4226    ) -> Option<(ModelHandle<Worktree>, PathBuf)> {
4227        for tree in &self.worktrees {
4228            if let Some(tree) = tree.upgrade(cx) {
4229                if let Some(relative_path) = tree
4230                    .read(cx)
4231                    .as_local()
4232                    .and_then(|t| abs_path.strip_prefix(t.abs_path()).ok())
4233                {
4234                    return Some((tree.clone(), relative_path.into()));
4235                }
4236            }
4237        }
4238        None
4239    }
4240
4241    pub fn is_shared(&self) -> bool {
4242        match &self.client_state {
4243            Some(ProjectClientState::Local { .. }) => true,
4244            _ => false,
4245        }
4246    }
4247
4248    fn create_local_worktree(
4249        &mut self,
4250        abs_path: impl AsRef<Path>,
4251        visible: bool,
4252        cx: &mut ModelContext<Self>,
4253    ) -> Task<Result<ModelHandle<Worktree>>> {
4254        let fs = self.fs.clone();
4255        let client = self.client.clone();
4256        let next_entry_id = self.next_entry_id.clone();
4257        let path: Arc<Path> = abs_path.as_ref().into();
4258        let task = self
4259            .loading_local_worktrees
4260            .entry(path.clone())
4261            .or_insert_with(|| {
4262                cx.spawn(|project, mut cx| {
4263                    async move {
4264                        let worktree = Worktree::local(
4265                            client.clone(),
4266                            path.clone(),
4267                            visible,
4268                            fs,
4269                            next_entry_id,
4270                            &mut cx,
4271                        )
4272                        .await;
4273                        project.update(&mut cx, |project, _| {
4274                            project.loading_local_worktrees.remove(&path);
4275                        });
4276                        let worktree = worktree?;
4277
4278                        project
4279                            .update(&mut cx, |project, cx| project.add_worktree(&worktree, cx))
4280                            .await;
4281
4282                        if let Some(project_id) =
4283                            project.read_with(&cx, |project, _| project.remote_id())
4284                        {
4285                            worktree.update(&mut cx, |worktree, cx| {
4286                                worktree
4287                                    .as_local_mut()
4288                                    .unwrap()
4289                                    .share(project_id, cx)
4290                                    .detach_and_log_err(cx);
4291                            });
4292                        }
4293
4294                        Ok(worktree)
4295                    }
4296                    .map_err(Arc::new)
4297                })
4298                .shared()
4299            })
4300            .clone();
4301        cx.foreground().spawn(async move {
4302            match task.await {
4303                Ok(worktree) => Ok(worktree),
4304                Err(err) => Err(anyhow!("{}", err)),
4305            }
4306        })
4307    }
4308
4309    pub fn remove_worktree(
4310        &mut self,
4311        id_to_remove: WorktreeId,
4312        cx: &mut ModelContext<Self>,
4313    ) -> impl Future<Output = ()> {
4314        self.worktrees.retain(|worktree| {
4315            if let Some(worktree) = worktree.upgrade(cx) {
4316                let id = worktree.read(cx).id();
4317                if id == id_to_remove {
4318                    cx.emit(Event::WorktreeRemoved(id));
4319                    false
4320                } else {
4321                    true
4322                }
4323            } else {
4324                false
4325            }
4326        });
4327        self.metadata_changed(cx)
4328    }
4329
4330    fn add_worktree(
4331        &mut self,
4332        worktree: &ModelHandle<Worktree>,
4333        cx: &mut ModelContext<Self>,
4334    ) -> impl Future<Output = ()> {
4335        cx.observe(worktree, |_, _, cx| cx.notify()).detach();
4336        if worktree.read(cx).is_local() {
4337            cx.subscribe(worktree, |this, worktree, event, cx| match event {
4338                worktree::Event::UpdatedEntries => this.update_local_worktree_buffers(worktree, cx),
4339                worktree::Event::UpdatedGitRepositories(updated_repos) => {
4340                    this.update_local_worktree_buffers_git_repos(worktree, updated_repos, cx)
4341                }
4342            })
4343            .detach();
4344        }
4345
4346        let push_strong_handle = {
4347            let worktree = worktree.read(cx);
4348            self.is_shared() || worktree.is_visible() || worktree.is_remote()
4349        };
4350        if push_strong_handle {
4351            self.worktrees
4352                .push(WorktreeHandle::Strong(worktree.clone()));
4353        } else {
4354            self.worktrees
4355                .push(WorktreeHandle::Weak(worktree.downgrade()));
4356        }
4357
4358        cx.observe_release(worktree, |this, worktree, cx| {
4359            let _ = this.remove_worktree(worktree.id(), cx);
4360        })
4361        .detach();
4362
4363        cx.emit(Event::WorktreeAdded);
4364        self.metadata_changed(cx)
4365    }
4366
4367    fn update_local_worktree_buffers(
4368        &mut self,
4369        worktree_handle: ModelHandle<Worktree>,
4370        cx: &mut ModelContext<Self>,
4371    ) {
4372        let snapshot = worktree_handle.read(cx).snapshot();
4373        let mut buffers_to_delete = Vec::new();
4374        let mut renamed_buffers = Vec::new();
4375        for (buffer_id, buffer) in &self.opened_buffers {
4376            if let Some(buffer) = buffer.upgrade(cx) {
4377                buffer.update(cx, |buffer, cx| {
4378                    if let Some(old_file) = File::from_dyn(buffer.file()) {
4379                        if old_file.worktree != worktree_handle {
4380                            return;
4381                        }
4382
4383                        let new_file = if let Some(entry) = snapshot.entry_for_id(old_file.entry_id)
4384                        {
4385                            File {
4386                                is_local: true,
4387                                entry_id: entry.id,
4388                                mtime: entry.mtime,
4389                                path: entry.path.clone(),
4390                                worktree: worktree_handle.clone(),
4391                                is_deleted: false,
4392                            }
4393                        } else if let Some(entry) =
4394                            snapshot.entry_for_path(old_file.path().as_ref())
4395                        {
4396                            File {
4397                                is_local: true,
4398                                entry_id: entry.id,
4399                                mtime: entry.mtime,
4400                                path: entry.path.clone(),
4401                                worktree: worktree_handle.clone(),
4402                                is_deleted: false,
4403                            }
4404                        } else {
4405                            File {
4406                                is_local: true,
4407                                entry_id: old_file.entry_id,
4408                                path: old_file.path().clone(),
4409                                mtime: old_file.mtime(),
4410                                worktree: worktree_handle.clone(),
4411                                is_deleted: true,
4412                            }
4413                        };
4414
4415                        let old_path = old_file.abs_path(cx);
4416                        if new_file.abs_path(cx) != old_path {
4417                            renamed_buffers.push((cx.handle(), old_path));
4418                        }
4419
4420                        if let Some(project_id) = self.remote_id() {
4421                            self.client
4422                                .send(proto::UpdateBufferFile {
4423                                    project_id,
4424                                    buffer_id: *buffer_id as u64,
4425                                    file: Some(new_file.to_proto()),
4426                                })
4427                                .log_err();
4428                        }
4429                        buffer.file_updated(Arc::new(new_file), cx).detach();
4430                    }
4431                });
4432            } else {
4433                buffers_to_delete.push(*buffer_id);
4434            }
4435        }
4436
4437        for buffer_id in buffers_to_delete {
4438            self.opened_buffers.remove(&buffer_id);
4439        }
4440
4441        for (buffer, old_path) in renamed_buffers {
4442            self.unregister_buffer_from_language_server(&buffer, old_path, cx);
4443            self.assign_language_to_buffer(&buffer, cx);
4444            self.register_buffer_with_language_server(&buffer, cx);
4445        }
4446    }
4447
4448    fn update_local_worktree_buffers_git_repos(
4449        &mut self,
4450        worktree: ModelHandle<Worktree>,
4451        repos: &[GitRepositoryEntry],
4452        cx: &mut ModelContext<Self>,
4453    ) {
4454        for (_, buffer) in &self.opened_buffers {
4455            if let Some(buffer) = buffer.upgrade(cx) {
4456                let file = match File::from_dyn(buffer.read(cx).file()) {
4457                    Some(file) => file,
4458                    None => continue,
4459                };
4460                if file.worktree != worktree {
4461                    continue;
4462                }
4463
4464                let path = file.path().clone();
4465
4466                let repo = match repos.iter().find(|repo| repo.manages(&path)) {
4467                    Some(repo) => repo.clone(),
4468                    None => return,
4469                };
4470
4471                let relative_repo = match path.strip_prefix(repo.content_path) {
4472                    Ok(relative_repo) => relative_repo.to_owned(),
4473                    Err(_) => return,
4474                };
4475
4476                let remote_id = self.remote_id();
4477                let client = self.client.clone();
4478
4479                cx.spawn(|_, mut cx| async move {
4480                    let diff_base = cx
4481                        .background()
4482                        .spawn(async move { repo.repo.lock().load_index_text(&relative_repo) })
4483                        .await;
4484
4485                    let buffer_id = buffer.update(&mut cx, |buffer, cx| {
4486                        buffer.set_diff_base(diff_base.clone(), cx);
4487                        buffer.remote_id()
4488                    });
4489
4490                    if let Some(project_id) = remote_id {
4491                        client
4492                            .send(proto::UpdateDiffBase {
4493                                project_id,
4494                                buffer_id: buffer_id as u64,
4495                                diff_base,
4496                            })
4497                            .log_err();
4498                    }
4499                })
4500                .detach();
4501            }
4502        }
4503    }
4504
4505    pub fn set_active_path(&mut self, entry: Option<ProjectPath>, cx: &mut ModelContext<Self>) {
4506        let new_active_entry = entry.and_then(|project_path| {
4507            let worktree = self.worktree_for_id(project_path.worktree_id, cx)?;
4508            let entry = worktree.read(cx).entry_for_path(project_path.path)?;
4509            Some(entry.id)
4510        });
4511        if new_active_entry != self.active_entry {
4512            self.active_entry = new_active_entry;
4513            cx.emit(Event::ActiveEntryChanged(new_active_entry));
4514        }
4515    }
4516
4517    pub fn language_servers_running_disk_based_diagnostics(
4518        &self,
4519    ) -> impl Iterator<Item = usize> + '_ {
4520        self.language_server_statuses
4521            .iter()
4522            .filter_map(|(id, status)| {
4523                if status.has_pending_diagnostic_updates {
4524                    Some(*id)
4525                } else {
4526                    None
4527                }
4528            })
4529    }
4530
4531    pub fn diagnostic_summary(&self, cx: &AppContext) -> DiagnosticSummary {
4532        let mut summary = DiagnosticSummary::default();
4533        for (_, path_summary) in self.diagnostic_summaries(cx) {
4534            summary.error_count += path_summary.error_count;
4535            summary.warning_count += path_summary.warning_count;
4536        }
4537        summary
4538    }
4539
4540    pub fn diagnostic_summaries<'a>(
4541        &'a self,
4542        cx: &'a AppContext,
4543    ) -> impl Iterator<Item = (ProjectPath, DiagnosticSummary)> + 'a {
4544        self.visible_worktrees(cx).flat_map(move |worktree| {
4545            let worktree = worktree.read(cx);
4546            let worktree_id = worktree.id();
4547            worktree
4548                .diagnostic_summaries()
4549                .map(move |(path, summary)| (ProjectPath { worktree_id, path }, summary))
4550        })
4551    }
4552
4553    pub fn disk_based_diagnostics_started(
4554        &mut self,
4555        language_server_id: usize,
4556        cx: &mut ModelContext<Self>,
4557    ) {
4558        cx.emit(Event::DiskBasedDiagnosticsStarted { language_server_id });
4559    }
4560
4561    pub fn disk_based_diagnostics_finished(
4562        &mut self,
4563        language_server_id: usize,
4564        cx: &mut ModelContext<Self>,
4565    ) {
4566        cx.emit(Event::DiskBasedDiagnosticsFinished { language_server_id });
4567    }
4568
4569    pub fn active_entry(&self) -> Option<ProjectEntryId> {
4570        self.active_entry
4571    }
4572
4573    pub fn entry_for_path(&self, path: &ProjectPath, cx: &AppContext) -> Option<Entry> {
4574        self.worktree_for_id(path.worktree_id, cx)?
4575            .read(cx)
4576            .entry_for_path(&path.path)
4577            .cloned()
4578    }
4579
4580    pub fn path_for_entry(&self, entry_id: ProjectEntryId, cx: &AppContext) -> Option<ProjectPath> {
4581        let worktree = self.worktree_for_entry(entry_id, cx)?;
4582        let worktree = worktree.read(cx);
4583        let worktree_id = worktree.id();
4584        let path = worktree.entry_for_id(entry_id)?.path.clone();
4585        Some(ProjectPath { worktree_id, path })
4586    }
4587
4588    // RPC message handlers
4589
4590    async fn handle_unshare_project(
4591        this: ModelHandle<Self>,
4592        _: TypedEnvelope<proto::UnshareProject>,
4593        _: Arc<Client>,
4594        mut cx: AsyncAppContext,
4595    ) -> Result<()> {
4596        this.update(&mut cx, |this, cx| {
4597            if this.is_local() {
4598                this.unshare(cx)?;
4599            } else {
4600                this.disconnected_from_host(cx);
4601            }
4602            Ok(())
4603        })
4604    }
4605
4606    async fn handle_add_collaborator(
4607        this: ModelHandle<Self>,
4608        mut envelope: TypedEnvelope<proto::AddProjectCollaborator>,
4609        _: Arc<Client>,
4610        mut cx: AsyncAppContext,
4611    ) -> Result<()> {
4612        let collaborator = envelope
4613            .payload
4614            .collaborator
4615            .take()
4616            .ok_or_else(|| anyhow!("empty collaborator"))?;
4617
4618        let collaborator = Collaborator::from_proto(collaborator)?;
4619        this.update(&mut cx, |this, cx| {
4620            this.collaborators
4621                .insert(collaborator.peer_id, collaborator);
4622            cx.notify();
4623        });
4624
4625        Ok(())
4626    }
4627
4628    async fn handle_update_collaborator(
4629        this: ModelHandle<Self>,
4630        envelope: TypedEnvelope<proto::UpdateProjectCollaborator>,
4631        _: Arc<Client>,
4632        mut cx: AsyncAppContext,
4633    ) -> Result<()> {
4634        let old_peer_id = envelope
4635            .payload
4636            .old_peer_id
4637            .ok_or_else(|| anyhow!("missing old peer id"))?;
4638        let new_peer_id = envelope
4639            .payload
4640            .new_peer_id
4641            .ok_or_else(|| anyhow!("missing new peer id"))?;
4642        this.update(&mut cx, |this, cx| {
4643            let collaborator = this
4644                .collaborators
4645                .remove(&old_peer_id)
4646                .ok_or_else(|| anyhow!("received UpdateProjectCollaborator for unknown peer"))?;
4647            this.collaborators.insert(new_peer_id, collaborator);
4648            if let Some(buffers) = this.shared_buffers.remove(&old_peer_id) {
4649                this.shared_buffers.insert(new_peer_id, buffers);
4650            }
4651
4652            cx.emit(Event::CollaboratorUpdated {
4653                old_peer_id,
4654                new_peer_id,
4655            });
4656            cx.notify();
4657            Ok(())
4658        })
4659    }
4660
4661    async fn handle_remove_collaborator(
4662        this: ModelHandle<Self>,
4663        envelope: TypedEnvelope<proto::RemoveProjectCollaborator>,
4664        _: Arc<Client>,
4665        mut cx: AsyncAppContext,
4666    ) -> Result<()> {
4667        this.update(&mut cx, |this, cx| {
4668            let peer_id = envelope
4669                .payload
4670                .peer_id
4671                .ok_or_else(|| anyhow!("invalid peer id"))?;
4672            let replica_id = this
4673                .collaborators
4674                .remove(&peer_id)
4675                .ok_or_else(|| anyhow!("unknown peer {:?}", peer_id))?
4676                .replica_id;
4677            for buffer in this.opened_buffers.values() {
4678                if let Some(buffer) = buffer.upgrade(cx) {
4679                    buffer.update(cx, |buffer, cx| buffer.remove_peer(replica_id, cx));
4680                }
4681            }
4682            this.shared_buffers.remove(&peer_id);
4683
4684            cx.emit(Event::CollaboratorLeft(peer_id));
4685            cx.notify();
4686            Ok(())
4687        })
4688    }
4689
4690    async fn handle_update_project(
4691        this: ModelHandle<Self>,
4692        envelope: TypedEnvelope<proto::UpdateProject>,
4693        _: Arc<Client>,
4694        mut cx: AsyncAppContext,
4695    ) -> Result<()> {
4696        this.update(&mut cx, |this, cx| {
4697            this.set_worktrees_from_proto(envelope.payload.worktrees, cx)?;
4698            Ok(())
4699        })
4700    }
4701
4702    async fn handle_update_worktree(
4703        this: ModelHandle<Self>,
4704        envelope: TypedEnvelope<proto::UpdateWorktree>,
4705        _: Arc<Client>,
4706        mut cx: AsyncAppContext,
4707    ) -> Result<()> {
4708        this.update(&mut cx, |this, cx| {
4709            let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
4710            if let Some(worktree) = this.worktree_for_id(worktree_id, cx) {
4711                worktree.update(cx, |worktree, _| {
4712                    let worktree = worktree.as_remote_mut().unwrap();
4713                    worktree.update_from_remote(envelope.payload);
4714                });
4715            }
4716            Ok(())
4717        })
4718    }
4719
4720    async fn handle_create_project_entry(
4721        this: ModelHandle<Self>,
4722        envelope: TypedEnvelope<proto::CreateProjectEntry>,
4723        _: Arc<Client>,
4724        mut cx: AsyncAppContext,
4725    ) -> Result<proto::ProjectEntryResponse> {
4726        let worktree = this.update(&mut cx, |this, cx| {
4727            let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
4728            this.worktree_for_id(worktree_id, cx)
4729                .ok_or_else(|| anyhow!("worktree not found"))
4730        })?;
4731        let worktree_scan_id = worktree.read_with(&cx, |worktree, _| worktree.scan_id());
4732        let entry = worktree
4733            .update(&mut cx, |worktree, cx| {
4734                let worktree = worktree.as_local_mut().unwrap();
4735                let path = PathBuf::from(envelope.payload.path);
4736                worktree.create_entry(path, envelope.payload.is_directory, cx)
4737            })
4738            .await?;
4739        Ok(proto::ProjectEntryResponse {
4740            entry: Some((&entry).into()),
4741            worktree_scan_id: worktree_scan_id as u64,
4742        })
4743    }
4744
4745    async fn handle_rename_project_entry(
4746        this: ModelHandle<Self>,
4747        envelope: TypedEnvelope<proto::RenameProjectEntry>,
4748        _: Arc<Client>,
4749        mut cx: AsyncAppContext,
4750    ) -> Result<proto::ProjectEntryResponse> {
4751        let entry_id = ProjectEntryId::from_proto(envelope.payload.entry_id);
4752        let worktree = this.read_with(&cx, |this, cx| {
4753            this.worktree_for_entry(entry_id, cx)
4754                .ok_or_else(|| anyhow!("worktree not found"))
4755        })?;
4756        let worktree_scan_id = worktree.read_with(&cx, |worktree, _| worktree.scan_id());
4757        let entry = worktree
4758            .update(&mut cx, |worktree, cx| {
4759                let new_path = PathBuf::from(envelope.payload.new_path);
4760                worktree
4761                    .as_local_mut()
4762                    .unwrap()
4763                    .rename_entry(entry_id, new_path, cx)
4764                    .ok_or_else(|| anyhow!("invalid entry"))
4765            })?
4766            .await?;
4767        Ok(proto::ProjectEntryResponse {
4768            entry: Some((&entry).into()),
4769            worktree_scan_id: worktree_scan_id as u64,
4770        })
4771    }
4772
4773    async fn handle_copy_project_entry(
4774        this: ModelHandle<Self>,
4775        envelope: TypedEnvelope<proto::CopyProjectEntry>,
4776        _: Arc<Client>,
4777        mut cx: AsyncAppContext,
4778    ) -> Result<proto::ProjectEntryResponse> {
4779        let entry_id = ProjectEntryId::from_proto(envelope.payload.entry_id);
4780        let worktree = this.read_with(&cx, |this, cx| {
4781            this.worktree_for_entry(entry_id, cx)
4782                .ok_or_else(|| anyhow!("worktree not found"))
4783        })?;
4784        let worktree_scan_id = worktree.read_with(&cx, |worktree, _| worktree.scan_id());
4785        let entry = worktree
4786            .update(&mut cx, |worktree, cx| {
4787                let new_path = PathBuf::from(envelope.payload.new_path);
4788                worktree
4789                    .as_local_mut()
4790                    .unwrap()
4791                    .copy_entry(entry_id, new_path, cx)
4792                    .ok_or_else(|| anyhow!("invalid entry"))
4793            })?
4794            .await?;
4795        Ok(proto::ProjectEntryResponse {
4796            entry: Some((&entry).into()),
4797            worktree_scan_id: worktree_scan_id as u64,
4798        })
4799    }
4800
4801    async fn handle_delete_project_entry(
4802        this: ModelHandle<Self>,
4803        envelope: TypedEnvelope<proto::DeleteProjectEntry>,
4804        _: Arc<Client>,
4805        mut cx: AsyncAppContext,
4806    ) -> Result<proto::ProjectEntryResponse> {
4807        let entry_id = ProjectEntryId::from_proto(envelope.payload.entry_id);
4808        let worktree = this.read_with(&cx, |this, cx| {
4809            this.worktree_for_entry(entry_id, cx)
4810                .ok_or_else(|| anyhow!("worktree not found"))
4811        })?;
4812        let worktree_scan_id = worktree.read_with(&cx, |worktree, _| worktree.scan_id());
4813        worktree
4814            .update(&mut cx, |worktree, cx| {
4815                worktree
4816                    .as_local_mut()
4817                    .unwrap()
4818                    .delete_entry(entry_id, cx)
4819                    .ok_or_else(|| anyhow!("invalid entry"))
4820            })?
4821            .await?;
4822        Ok(proto::ProjectEntryResponse {
4823            entry: None,
4824            worktree_scan_id: worktree_scan_id as u64,
4825        })
4826    }
4827
4828    async fn handle_update_diagnostic_summary(
4829        this: ModelHandle<Self>,
4830        envelope: TypedEnvelope<proto::UpdateDiagnosticSummary>,
4831        _: Arc<Client>,
4832        mut cx: AsyncAppContext,
4833    ) -> Result<()> {
4834        this.update(&mut cx, |this, cx| {
4835            let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
4836            if let Some(worktree) = this.worktree_for_id(worktree_id, cx) {
4837                if let Some(summary) = envelope.payload.summary {
4838                    let project_path = ProjectPath {
4839                        worktree_id,
4840                        path: Path::new(&summary.path).into(),
4841                    };
4842                    worktree.update(cx, |worktree, _| {
4843                        worktree
4844                            .as_remote_mut()
4845                            .unwrap()
4846                            .update_diagnostic_summary(project_path.path.clone(), &summary);
4847                    });
4848                    cx.emit(Event::DiagnosticsUpdated {
4849                        language_server_id: summary.language_server_id as usize,
4850                        path: project_path,
4851                    });
4852                }
4853            }
4854            Ok(())
4855        })
4856    }
4857
4858    async fn handle_start_language_server(
4859        this: ModelHandle<Self>,
4860        envelope: TypedEnvelope<proto::StartLanguageServer>,
4861        _: Arc<Client>,
4862        mut cx: AsyncAppContext,
4863    ) -> Result<()> {
4864        let server = envelope
4865            .payload
4866            .server
4867            .ok_or_else(|| anyhow!("invalid server"))?;
4868        this.update(&mut cx, |this, cx| {
4869            this.language_server_statuses.insert(
4870                server.id as usize,
4871                LanguageServerStatus {
4872                    name: server.name,
4873                    pending_work: Default::default(),
4874                    has_pending_diagnostic_updates: false,
4875                    progress_tokens: Default::default(),
4876                },
4877            );
4878            cx.notify();
4879        });
4880        Ok(())
4881    }
4882
4883    async fn handle_update_language_server(
4884        this: ModelHandle<Self>,
4885        envelope: TypedEnvelope<proto::UpdateLanguageServer>,
4886        _: Arc<Client>,
4887        mut cx: AsyncAppContext,
4888    ) -> Result<()> {
4889        this.update(&mut cx, |this, cx| {
4890            let language_server_id = envelope.payload.language_server_id as usize;
4891
4892            match envelope
4893                .payload
4894                .variant
4895                .ok_or_else(|| anyhow!("invalid variant"))?
4896            {
4897                proto::update_language_server::Variant::WorkStart(payload) => {
4898                    this.on_lsp_work_start(
4899                        language_server_id,
4900                        payload.token,
4901                        LanguageServerProgress {
4902                            message: payload.message,
4903                            percentage: payload.percentage.map(|p| p as usize),
4904                            last_update_at: Instant::now(),
4905                        },
4906                        cx,
4907                    );
4908                }
4909
4910                proto::update_language_server::Variant::WorkProgress(payload) => {
4911                    this.on_lsp_work_progress(
4912                        language_server_id,
4913                        payload.token,
4914                        LanguageServerProgress {
4915                            message: payload.message,
4916                            percentage: payload.percentage.map(|p| p as usize),
4917                            last_update_at: Instant::now(),
4918                        },
4919                        cx,
4920                    );
4921                }
4922
4923                proto::update_language_server::Variant::WorkEnd(payload) => {
4924                    this.on_lsp_work_end(language_server_id, payload.token, cx);
4925                }
4926
4927                proto::update_language_server::Variant::DiskBasedDiagnosticsUpdating(_) => {
4928                    this.disk_based_diagnostics_started(language_server_id, cx);
4929                }
4930
4931                proto::update_language_server::Variant::DiskBasedDiagnosticsUpdated(_) => {
4932                    this.disk_based_diagnostics_finished(language_server_id, cx)
4933                }
4934            }
4935
4936            Ok(())
4937        })
4938    }
4939
4940    async fn handle_update_buffer(
4941        this: ModelHandle<Self>,
4942        envelope: TypedEnvelope<proto::UpdateBuffer>,
4943        _: Arc<Client>,
4944        mut cx: AsyncAppContext,
4945    ) -> Result<()> {
4946        this.update(&mut cx, |this, cx| {
4947            let payload = envelope.payload.clone();
4948            let buffer_id = payload.buffer_id;
4949            let ops = payload
4950                .operations
4951                .into_iter()
4952                .map(language::proto::deserialize_operation)
4953                .collect::<Result<Vec<_>, _>>()?;
4954            let is_remote = this.is_remote();
4955            match this.opened_buffers.entry(buffer_id) {
4956                hash_map::Entry::Occupied(mut e) => match e.get_mut() {
4957                    OpenBuffer::Strong(buffer) => {
4958                        buffer.update(cx, |buffer, cx| buffer.apply_ops(ops, cx))?;
4959                    }
4960                    OpenBuffer::Operations(operations) => operations.extend_from_slice(&ops),
4961                    OpenBuffer::Weak(_) => {}
4962                },
4963                hash_map::Entry::Vacant(e) => {
4964                    assert!(
4965                        is_remote,
4966                        "received buffer update from {:?}",
4967                        envelope.original_sender_id
4968                    );
4969                    e.insert(OpenBuffer::Operations(ops));
4970                }
4971            }
4972            Ok(())
4973        })
4974    }
4975
4976    async fn handle_create_buffer_for_peer(
4977        this: ModelHandle<Self>,
4978        envelope: TypedEnvelope<proto::CreateBufferForPeer>,
4979        _: Arc<Client>,
4980        mut cx: AsyncAppContext,
4981    ) -> Result<()> {
4982        this.update(&mut cx, |this, cx| {
4983            match envelope
4984                .payload
4985                .variant
4986                .ok_or_else(|| anyhow!("missing variant"))?
4987            {
4988                proto::create_buffer_for_peer::Variant::State(mut state) => {
4989                    let mut buffer_file = None;
4990                    if let Some(file) = state.file.take() {
4991                        let worktree_id = WorktreeId::from_proto(file.worktree_id);
4992                        let worktree = this.worktree_for_id(worktree_id, cx).ok_or_else(|| {
4993                            anyhow!("no worktree found for id {}", file.worktree_id)
4994                        })?;
4995                        buffer_file = Some(Arc::new(File::from_proto(file, worktree.clone(), cx)?)
4996                            as Arc<dyn language::File>);
4997                    }
4998
4999                    let buffer_id = state.id;
5000                    let buffer = cx.add_model(|_| {
5001                        Buffer::from_proto(this.replica_id(), state, buffer_file).unwrap()
5002                    });
5003                    this.incomplete_buffers.insert(buffer_id, buffer);
5004                }
5005                proto::create_buffer_for_peer::Variant::Chunk(chunk) => {
5006                    let buffer = this
5007                        .incomplete_buffers
5008                        .get(&chunk.buffer_id)
5009                        .ok_or_else(|| {
5010                            anyhow!(
5011                                "received chunk for buffer {} without initial state",
5012                                chunk.buffer_id
5013                            )
5014                        })?
5015                        .clone();
5016                    let operations = chunk
5017                        .operations
5018                        .into_iter()
5019                        .map(language::proto::deserialize_operation)
5020                        .collect::<Result<Vec<_>>>()?;
5021                    buffer.update(cx, |buffer, cx| buffer.apply_ops(operations, cx))?;
5022
5023                    if chunk.is_last {
5024                        this.incomplete_buffers.remove(&chunk.buffer_id);
5025                        this.register_buffer(&buffer, cx)?;
5026                    }
5027                }
5028            }
5029
5030            Ok(())
5031        })
5032    }
5033
5034    async fn handle_update_diff_base(
5035        this: ModelHandle<Self>,
5036        envelope: TypedEnvelope<proto::UpdateDiffBase>,
5037        _: Arc<Client>,
5038        mut cx: AsyncAppContext,
5039    ) -> Result<()> {
5040        this.update(&mut cx, |this, cx| {
5041            let buffer_id = envelope.payload.buffer_id;
5042            let diff_base = envelope.payload.diff_base;
5043            let buffer = this
5044                .opened_buffers
5045                .get_mut(&buffer_id)
5046                .and_then(|b| b.upgrade(cx))
5047                .ok_or_else(|| anyhow!("No such buffer {}", buffer_id))?;
5048
5049            buffer.update(cx, |buffer, cx| buffer.set_diff_base(diff_base, cx));
5050
5051            Ok(())
5052        })
5053    }
5054
5055    async fn handle_update_buffer_file(
5056        this: ModelHandle<Self>,
5057        envelope: TypedEnvelope<proto::UpdateBufferFile>,
5058        _: Arc<Client>,
5059        mut cx: AsyncAppContext,
5060    ) -> Result<()> {
5061        this.update(&mut cx, |this, cx| {
5062            let payload = envelope.payload.clone();
5063            let buffer_id = payload.buffer_id;
5064            let file = payload.file.ok_or_else(|| anyhow!("invalid file"))?;
5065            let worktree = this
5066                .worktree_for_id(WorktreeId::from_proto(file.worktree_id), cx)
5067                .ok_or_else(|| anyhow!("no such worktree"))?;
5068            let file = File::from_proto(file, worktree, cx)?;
5069            let buffer = this
5070                .opened_buffers
5071                .get_mut(&buffer_id)
5072                .and_then(|b| b.upgrade(cx))
5073                .ok_or_else(|| anyhow!("no such buffer"))?;
5074            buffer.update(cx, |buffer, cx| {
5075                buffer.file_updated(Arc::new(file), cx).detach();
5076            });
5077            this.assign_language_to_buffer(&buffer, cx);
5078            Ok(())
5079        })
5080    }
5081
5082    async fn handle_save_buffer(
5083        this: ModelHandle<Self>,
5084        envelope: TypedEnvelope<proto::SaveBuffer>,
5085        _: Arc<Client>,
5086        mut cx: AsyncAppContext,
5087    ) -> Result<proto::BufferSaved> {
5088        let buffer_id = envelope.payload.buffer_id;
5089        let requested_version = deserialize_version(envelope.payload.version);
5090
5091        let (project_id, buffer) = this.update(&mut cx, |this, cx| {
5092            let project_id = this.remote_id().ok_or_else(|| anyhow!("not connected"))?;
5093            let buffer = this
5094                .opened_buffers
5095                .get(&buffer_id)
5096                .and_then(|buffer| buffer.upgrade(cx))
5097                .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))?;
5098            Ok::<_, anyhow::Error>((project_id, buffer))
5099        })?;
5100        buffer
5101            .update(&mut cx, |buffer, _| {
5102                buffer.wait_for_version(requested_version)
5103            })
5104            .await;
5105
5106        let (saved_version, fingerprint, mtime) =
5107            buffer.update(&mut cx, |buffer, cx| buffer.save(cx)).await?;
5108        Ok(proto::BufferSaved {
5109            project_id,
5110            buffer_id,
5111            version: serialize_version(&saved_version),
5112            mtime: Some(mtime.into()),
5113            fingerprint,
5114        })
5115    }
5116
5117    async fn handle_reload_buffers(
5118        this: ModelHandle<Self>,
5119        envelope: TypedEnvelope<proto::ReloadBuffers>,
5120        _: Arc<Client>,
5121        mut cx: AsyncAppContext,
5122    ) -> Result<proto::ReloadBuffersResponse> {
5123        let sender_id = envelope.original_sender_id()?;
5124        let reload = this.update(&mut cx, |this, cx| {
5125            let mut buffers = HashSet::default();
5126            for buffer_id in &envelope.payload.buffer_ids {
5127                buffers.insert(
5128                    this.opened_buffers
5129                        .get(buffer_id)
5130                        .and_then(|buffer| buffer.upgrade(cx))
5131                        .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))?,
5132                );
5133            }
5134            Ok::<_, anyhow::Error>(this.reload_buffers(buffers, false, cx))
5135        })?;
5136
5137        let project_transaction = reload.await?;
5138        let project_transaction = this.update(&mut cx, |this, cx| {
5139            this.serialize_project_transaction_for_peer(project_transaction, sender_id, cx)
5140        });
5141        Ok(proto::ReloadBuffersResponse {
5142            transaction: Some(project_transaction),
5143        })
5144    }
5145
5146    async fn handle_format_buffers(
5147        this: ModelHandle<Self>,
5148        envelope: TypedEnvelope<proto::FormatBuffers>,
5149        _: Arc<Client>,
5150        mut cx: AsyncAppContext,
5151    ) -> Result<proto::FormatBuffersResponse> {
5152        let sender_id = envelope.original_sender_id()?;
5153        let format = this.update(&mut cx, |this, cx| {
5154            let mut buffers = HashSet::default();
5155            for buffer_id in &envelope.payload.buffer_ids {
5156                buffers.insert(
5157                    this.opened_buffers
5158                        .get(buffer_id)
5159                        .and_then(|buffer| buffer.upgrade(cx))
5160                        .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))?,
5161                );
5162            }
5163            let trigger = FormatTrigger::from_proto(envelope.payload.trigger);
5164            Ok::<_, anyhow::Error>(this.format(buffers, false, trigger, cx))
5165        })?;
5166
5167        let project_transaction = format.await?;
5168        let project_transaction = this.update(&mut cx, |this, cx| {
5169            this.serialize_project_transaction_for_peer(project_transaction, sender_id, cx)
5170        });
5171        Ok(proto::FormatBuffersResponse {
5172            transaction: Some(project_transaction),
5173        })
5174    }
5175
5176    async fn handle_get_completions(
5177        this: ModelHandle<Self>,
5178        envelope: TypedEnvelope<proto::GetCompletions>,
5179        _: Arc<Client>,
5180        mut cx: AsyncAppContext,
5181    ) -> Result<proto::GetCompletionsResponse> {
5182        let buffer = this.read_with(&cx, |this, cx| {
5183            this.opened_buffers
5184                .get(&envelope.payload.buffer_id)
5185                .and_then(|buffer| buffer.upgrade(cx))
5186                .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))
5187        })?;
5188
5189        let position = envelope
5190            .payload
5191            .position
5192            .and_then(language::proto::deserialize_anchor)
5193            .map(|p| {
5194                buffer.read_with(&cx, |buffer, _| {
5195                    buffer.clip_point_utf16(Unclipped(p.to_point_utf16(buffer)), Bias::Left)
5196                })
5197            })
5198            .ok_or_else(|| anyhow!("invalid position"))?;
5199
5200        let version = deserialize_version(envelope.payload.version);
5201        buffer
5202            .update(&mut cx, |buffer, _| buffer.wait_for_version(version))
5203            .await;
5204        let version = buffer.read_with(&cx, |buffer, _| buffer.version());
5205
5206        let completions = this
5207            .update(&mut cx, |this, cx| this.completions(&buffer, position, cx))
5208            .await?;
5209
5210        Ok(proto::GetCompletionsResponse {
5211            completions: completions
5212                .iter()
5213                .map(language::proto::serialize_completion)
5214                .collect(),
5215            version: serialize_version(&version),
5216        })
5217    }
5218
5219    async fn handle_apply_additional_edits_for_completion(
5220        this: ModelHandle<Self>,
5221        envelope: TypedEnvelope<proto::ApplyCompletionAdditionalEdits>,
5222        _: Arc<Client>,
5223        mut cx: AsyncAppContext,
5224    ) -> Result<proto::ApplyCompletionAdditionalEditsResponse> {
5225        let (buffer, completion) = this.update(&mut cx, |this, cx| {
5226            let buffer = this
5227                .opened_buffers
5228                .get(&envelope.payload.buffer_id)
5229                .and_then(|buffer| buffer.upgrade(cx))
5230                .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))?;
5231            let language = buffer.read(cx).language();
5232            let completion = language::proto::deserialize_completion(
5233                envelope
5234                    .payload
5235                    .completion
5236                    .ok_or_else(|| anyhow!("invalid completion"))?,
5237                language.cloned(),
5238            );
5239            Ok::<_, anyhow::Error>((buffer, completion))
5240        })?;
5241
5242        let completion = completion.await?;
5243
5244        let apply_additional_edits = this.update(&mut cx, |this, cx| {
5245            this.apply_additional_edits_for_completion(buffer, completion, false, cx)
5246        });
5247
5248        Ok(proto::ApplyCompletionAdditionalEditsResponse {
5249            transaction: apply_additional_edits
5250                .await?
5251                .as_ref()
5252                .map(language::proto::serialize_transaction),
5253        })
5254    }
5255
5256    async fn handle_get_code_actions(
5257        this: ModelHandle<Self>,
5258        envelope: TypedEnvelope<proto::GetCodeActions>,
5259        _: Arc<Client>,
5260        mut cx: AsyncAppContext,
5261    ) -> Result<proto::GetCodeActionsResponse> {
5262        let start = envelope
5263            .payload
5264            .start
5265            .and_then(language::proto::deserialize_anchor)
5266            .ok_or_else(|| anyhow!("invalid start"))?;
5267        let end = envelope
5268            .payload
5269            .end
5270            .and_then(language::proto::deserialize_anchor)
5271            .ok_or_else(|| anyhow!("invalid end"))?;
5272        let buffer = this.update(&mut cx, |this, cx| {
5273            this.opened_buffers
5274                .get(&envelope.payload.buffer_id)
5275                .and_then(|buffer| buffer.upgrade(cx))
5276                .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))
5277        })?;
5278        buffer
5279            .update(&mut cx, |buffer, _| {
5280                buffer.wait_for_version(deserialize_version(envelope.payload.version))
5281            })
5282            .await;
5283
5284        let version = buffer.read_with(&cx, |buffer, _| buffer.version());
5285        let code_actions = this.update(&mut cx, |this, cx| {
5286            Ok::<_, anyhow::Error>(this.code_actions(&buffer, start..end, cx))
5287        })?;
5288
5289        Ok(proto::GetCodeActionsResponse {
5290            actions: code_actions
5291                .await?
5292                .iter()
5293                .map(language::proto::serialize_code_action)
5294                .collect(),
5295            version: serialize_version(&version),
5296        })
5297    }
5298
5299    async fn handle_apply_code_action(
5300        this: ModelHandle<Self>,
5301        envelope: TypedEnvelope<proto::ApplyCodeAction>,
5302        _: Arc<Client>,
5303        mut cx: AsyncAppContext,
5304    ) -> Result<proto::ApplyCodeActionResponse> {
5305        let sender_id = envelope.original_sender_id()?;
5306        let action = language::proto::deserialize_code_action(
5307            envelope
5308                .payload
5309                .action
5310                .ok_or_else(|| anyhow!("invalid action"))?,
5311        )?;
5312        let apply_code_action = this.update(&mut cx, |this, cx| {
5313            let buffer = this
5314                .opened_buffers
5315                .get(&envelope.payload.buffer_id)
5316                .and_then(|buffer| buffer.upgrade(cx))
5317                .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))?;
5318            Ok::<_, anyhow::Error>(this.apply_code_action(buffer, action, false, cx))
5319        })?;
5320
5321        let project_transaction = apply_code_action.await?;
5322        let project_transaction = this.update(&mut cx, |this, cx| {
5323            this.serialize_project_transaction_for_peer(project_transaction, sender_id, cx)
5324        });
5325        Ok(proto::ApplyCodeActionResponse {
5326            transaction: Some(project_transaction),
5327        })
5328    }
5329
5330    async fn handle_lsp_command<T: LspCommand>(
5331        this: ModelHandle<Self>,
5332        envelope: TypedEnvelope<T::ProtoRequest>,
5333        _: Arc<Client>,
5334        mut cx: AsyncAppContext,
5335    ) -> Result<<T::ProtoRequest as proto::RequestMessage>::Response>
5336    where
5337        <T::LspRequest as lsp::request::Request>::Result: Send,
5338    {
5339        let sender_id = envelope.original_sender_id()?;
5340        let buffer_id = T::buffer_id_from_proto(&envelope.payload);
5341        let buffer_handle = this.read_with(&cx, |this, _| {
5342            this.opened_buffers
5343                .get(&buffer_id)
5344                .and_then(|buffer| buffer.upgrade(&cx))
5345                .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))
5346        })?;
5347        let request = T::from_proto(
5348            envelope.payload,
5349            this.clone(),
5350            buffer_handle.clone(),
5351            cx.clone(),
5352        )
5353        .await?;
5354        let buffer_version = buffer_handle.read_with(&cx, |buffer, _| buffer.version());
5355        let response = this
5356            .update(&mut cx, |this, cx| {
5357                this.request_lsp(buffer_handle, request, cx)
5358            })
5359            .await?;
5360        this.update(&mut cx, |this, cx| {
5361            Ok(T::response_to_proto(
5362                response,
5363                this,
5364                sender_id,
5365                &buffer_version,
5366                cx,
5367            ))
5368        })
5369    }
5370
5371    async fn handle_get_project_symbols(
5372        this: ModelHandle<Self>,
5373        envelope: TypedEnvelope<proto::GetProjectSymbols>,
5374        _: Arc<Client>,
5375        mut cx: AsyncAppContext,
5376    ) -> Result<proto::GetProjectSymbolsResponse> {
5377        let symbols = this
5378            .update(&mut cx, |this, cx| {
5379                this.symbols(&envelope.payload.query, cx)
5380            })
5381            .await?;
5382
5383        Ok(proto::GetProjectSymbolsResponse {
5384            symbols: symbols.iter().map(serialize_symbol).collect(),
5385        })
5386    }
5387
5388    async fn handle_search_project(
5389        this: ModelHandle<Self>,
5390        envelope: TypedEnvelope<proto::SearchProject>,
5391        _: Arc<Client>,
5392        mut cx: AsyncAppContext,
5393    ) -> Result<proto::SearchProjectResponse> {
5394        let peer_id = envelope.original_sender_id()?;
5395        let query = SearchQuery::from_proto(envelope.payload)?;
5396        let result = this
5397            .update(&mut cx, |this, cx| this.search(query, cx))
5398            .await?;
5399
5400        this.update(&mut cx, |this, cx| {
5401            let mut locations = Vec::new();
5402            for (buffer, ranges) in result {
5403                for range in ranges {
5404                    let start = serialize_anchor(&range.start);
5405                    let end = serialize_anchor(&range.end);
5406                    let buffer_id = this.create_buffer_for_peer(&buffer, peer_id, cx);
5407                    locations.push(proto::Location {
5408                        buffer_id,
5409                        start: Some(start),
5410                        end: Some(end),
5411                    });
5412                }
5413            }
5414            Ok(proto::SearchProjectResponse { locations })
5415        })
5416    }
5417
5418    async fn handle_open_buffer_for_symbol(
5419        this: ModelHandle<Self>,
5420        envelope: TypedEnvelope<proto::OpenBufferForSymbol>,
5421        _: Arc<Client>,
5422        mut cx: AsyncAppContext,
5423    ) -> Result<proto::OpenBufferForSymbolResponse> {
5424        let peer_id = envelope.original_sender_id()?;
5425        let symbol = envelope
5426            .payload
5427            .symbol
5428            .ok_or_else(|| anyhow!("invalid symbol"))?;
5429        let symbol = this
5430            .read_with(&cx, |this, _| this.deserialize_symbol(symbol))
5431            .await?;
5432        let symbol = this.read_with(&cx, |this, _| {
5433            let signature = this.symbol_signature(&symbol.path);
5434            if signature == symbol.signature {
5435                Ok(symbol)
5436            } else {
5437                Err(anyhow!("invalid symbol signature"))
5438            }
5439        })?;
5440        let buffer = this
5441            .update(&mut cx, |this, cx| this.open_buffer_for_symbol(&symbol, cx))
5442            .await?;
5443
5444        Ok(proto::OpenBufferForSymbolResponse {
5445            buffer_id: this.update(&mut cx, |this, cx| {
5446                this.create_buffer_for_peer(&buffer, peer_id, cx)
5447            }),
5448        })
5449    }
5450
5451    fn symbol_signature(&self, project_path: &ProjectPath) -> [u8; 32] {
5452        let mut hasher = Sha256::new();
5453        hasher.update(project_path.worktree_id.to_proto().to_be_bytes());
5454        hasher.update(project_path.path.to_string_lossy().as_bytes());
5455        hasher.update(self.nonce.to_be_bytes());
5456        hasher.finalize().as_slice().try_into().unwrap()
5457    }
5458
5459    async fn handle_open_buffer_by_id(
5460        this: ModelHandle<Self>,
5461        envelope: TypedEnvelope<proto::OpenBufferById>,
5462        _: Arc<Client>,
5463        mut cx: AsyncAppContext,
5464    ) -> Result<proto::OpenBufferResponse> {
5465        let peer_id = envelope.original_sender_id()?;
5466        let buffer = this
5467            .update(&mut cx, |this, cx| {
5468                this.open_buffer_by_id(envelope.payload.id, cx)
5469            })
5470            .await?;
5471        this.update(&mut cx, |this, cx| {
5472            Ok(proto::OpenBufferResponse {
5473                buffer_id: this.create_buffer_for_peer(&buffer, peer_id, cx),
5474            })
5475        })
5476    }
5477
5478    async fn handle_open_buffer_by_path(
5479        this: ModelHandle<Self>,
5480        envelope: TypedEnvelope<proto::OpenBufferByPath>,
5481        _: Arc<Client>,
5482        mut cx: AsyncAppContext,
5483    ) -> Result<proto::OpenBufferResponse> {
5484        let peer_id = envelope.original_sender_id()?;
5485        let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
5486        let open_buffer = this.update(&mut cx, |this, cx| {
5487            this.open_buffer(
5488                ProjectPath {
5489                    worktree_id,
5490                    path: PathBuf::from(envelope.payload.path).into(),
5491                },
5492                cx,
5493            )
5494        });
5495
5496        let buffer = open_buffer.await?;
5497        this.update(&mut cx, |this, cx| {
5498            Ok(proto::OpenBufferResponse {
5499                buffer_id: this.create_buffer_for_peer(&buffer, peer_id, cx),
5500            })
5501        })
5502    }
5503
5504    fn serialize_project_transaction_for_peer(
5505        &mut self,
5506        project_transaction: ProjectTransaction,
5507        peer_id: proto::PeerId,
5508        cx: &AppContext,
5509    ) -> proto::ProjectTransaction {
5510        let mut serialized_transaction = proto::ProjectTransaction {
5511            buffer_ids: Default::default(),
5512            transactions: Default::default(),
5513        };
5514        for (buffer, transaction) in project_transaction.0 {
5515            serialized_transaction
5516                .buffer_ids
5517                .push(self.create_buffer_for_peer(&buffer, peer_id, cx));
5518            serialized_transaction
5519                .transactions
5520                .push(language::proto::serialize_transaction(&transaction));
5521        }
5522        serialized_transaction
5523    }
5524
5525    fn deserialize_project_transaction(
5526        &mut self,
5527        message: proto::ProjectTransaction,
5528        push_to_history: bool,
5529        cx: &mut ModelContext<Self>,
5530    ) -> Task<Result<ProjectTransaction>> {
5531        cx.spawn(|this, mut cx| async move {
5532            let mut project_transaction = ProjectTransaction::default();
5533            for (buffer_id, transaction) in message.buffer_ids.into_iter().zip(message.transactions)
5534            {
5535                let buffer = this
5536                    .update(&mut cx, |this, cx| this.wait_for_buffer(buffer_id, cx))
5537                    .await?;
5538                let transaction = language::proto::deserialize_transaction(transaction)?;
5539                project_transaction.0.insert(buffer, transaction);
5540            }
5541
5542            for (buffer, transaction) in &project_transaction.0 {
5543                buffer
5544                    .update(&mut cx, |buffer, _| {
5545                        buffer.wait_for_edits(transaction.edit_ids.iter().copied())
5546                    })
5547                    .await;
5548
5549                if push_to_history {
5550                    buffer.update(&mut cx, |buffer, _| {
5551                        buffer.push_transaction(transaction.clone(), Instant::now());
5552                    });
5553                }
5554            }
5555
5556            Ok(project_transaction)
5557        })
5558    }
5559
5560    fn create_buffer_for_peer(
5561        &mut self,
5562        buffer: &ModelHandle<Buffer>,
5563        peer_id: proto::PeerId,
5564        cx: &AppContext,
5565    ) -> u64 {
5566        let buffer_id = buffer.read(cx).remote_id();
5567        if let Some(project_id) = self.remote_id() {
5568            let shared_buffers = self.shared_buffers.entry(peer_id).or_default();
5569            if shared_buffers.insert(buffer_id) {
5570                let buffer = buffer.read(cx);
5571                let state = buffer.to_proto();
5572                let operations = buffer.serialize_ops(cx);
5573                let client = self.client.clone();
5574                cx.background()
5575                    .spawn(
5576                        async move {
5577                            let mut operations = operations.await;
5578
5579                            client.send(proto::CreateBufferForPeer {
5580                                project_id,
5581                                peer_id: Some(peer_id),
5582                                variant: Some(proto::create_buffer_for_peer::Variant::State(state)),
5583                            })?;
5584
5585                            loop {
5586                                #[cfg(any(test, feature = "test-support"))]
5587                                const CHUNK_SIZE: usize = 5;
5588
5589                                #[cfg(not(any(test, feature = "test-support")))]
5590                                const CHUNK_SIZE: usize = 100;
5591
5592                                let chunk = operations
5593                                    .drain(..cmp::min(CHUNK_SIZE, operations.len()))
5594                                    .collect();
5595                                let is_last = operations.is_empty();
5596                                client.send(proto::CreateBufferForPeer {
5597                                    project_id,
5598                                    peer_id: Some(peer_id),
5599                                    variant: Some(proto::create_buffer_for_peer::Variant::Chunk(
5600                                        proto::BufferChunk {
5601                                            buffer_id,
5602                                            operations: chunk,
5603                                            is_last,
5604                                        },
5605                                    )),
5606                                })?;
5607
5608                                if is_last {
5609                                    break;
5610                                }
5611                            }
5612
5613                            Ok(())
5614                        }
5615                        .log_err(),
5616                    )
5617                    .detach();
5618            }
5619        }
5620
5621        buffer_id
5622    }
5623
5624    fn wait_for_buffer(
5625        &self,
5626        id: u64,
5627        cx: &mut ModelContext<Self>,
5628    ) -> Task<Result<ModelHandle<Buffer>>> {
5629        let mut opened_buffer_rx = self.opened_buffer.1.clone();
5630        cx.spawn(|this, mut cx| async move {
5631            let buffer = loop {
5632                let buffer = this.read_with(&cx, |this, cx| {
5633                    this.opened_buffers
5634                        .get(&id)
5635                        .and_then(|buffer| buffer.upgrade(cx))
5636                });
5637                if let Some(buffer) = buffer {
5638                    break buffer;
5639                } else if this.read_with(&cx, |this, _| this.is_read_only()) {
5640                    return Err(anyhow!("disconnected before buffer {} could be opened", id));
5641                }
5642
5643                opened_buffer_rx
5644                    .next()
5645                    .await
5646                    .ok_or_else(|| anyhow!("project dropped while waiting for buffer"))?;
5647            };
5648            buffer.update(&mut cx, |buffer, cx| buffer.git_diff_recalc(cx));
5649            Ok(buffer)
5650        })
5651    }
5652
5653    pub fn worktree_metadata_protos(&self, cx: &AppContext) -> Vec<proto::WorktreeMetadata> {
5654        self.worktrees(cx)
5655            .map(|worktree| {
5656                let worktree = worktree.read(cx);
5657                proto::WorktreeMetadata {
5658                    id: worktree.id().to_proto(),
5659                    root_name: worktree.root_name().into(),
5660                    visible: worktree.is_visible(),
5661                    abs_path: worktree.abs_path().to_string_lossy().into(),
5662                }
5663            })
5664            .collect()
5665    }
5666
5667    fn set_worktrees_from_proto(
5668        &mut self,
5669        worktrees: Vec<proto::WorktreeMetadata>,
5670        cx: &mut ModelContext<Project>,
5671    ) -> Result<()> {
5672        let replica_id = self.replica_id();
5673        let remote_id = self.remote_id().ok_or_else(|| anyhow!("invalid project"))?;
5674
5675        let mut old_worktrees_by_id = self
5676            .worktrees
5677            .drain(..)
5678            .filter_map(|worktree| {
5679                let worktree = worktree.upgrade(cx)?;
5680                Some((worktree.read(cx).id(), worktree))
5681            })
5682            .collect::<HashMap<_, _>>();
5683
5684        for worktree in worktrees {
5685            if let Some(old_worktree) =
5686                old_worktrees_by_id.remove(&WorktreeId::from_proto(worktree.id))
5687            {
5688                self.worktrees.push(WorktreeHandle::Strong(old_worktree));
5689            } else {
5690                let worktree =
5691                    Worktree::remote(remote_id, replica_id, worktree, self.client.clone(), cx);
5692                let _ = self.add_worktree(&worktree, cx);
5693            }
5694        }
5695
5696        let _ = self.metadata_changed(cx);
5697        for (id, _) in old_worktrees_by_id {
5698            cx.emit(Event::WorktreeRemoved(id));
5699        }
5700
5701        Ok(())
5702    }
5703
5704    fn set_collaborators_from_proto(
5705        &mut self,
5706        messages: Vec<proto::Collaborator>,
5707        cx: &mut ModelContext<Self>,
5708    ) -> Result<()> {
5709        let mut collaborators = HashMap::default();
5710        for message in messages {
5711            let collaborator = Collaborator::from_proto(message)?;
5712            collaborators.insert(collaborator.peer_id, collaborator);
5713        }
5714        for old_peer_id in self.collaborators.keys() {
5715            if !collaborators.contains_key(old_peer_id) {
5716                cx.emit(Event::CollaboratorLeft(*old_peer_id));
5717            }
5718        }
5719        self.collaborators = collaborators;
5720        Ok(())
5721    }
5722
5723    fn deserialize_symbol(
5724        &self,
5725        serialized_symbol: proto::Symbol,
5726    ) -> impl Future<Output = Result<Symbol>> {
5727        let languages = self.languages.clone();
5728        async move {
5729            let source_worktree_id = WorktreeId::from_proto(serialized_symbol.source_worktree_id);
5730            let worktree_id = WorktreeId::from_proto(serialized_symbol.worktree_id);
5731            let start = serialized_symbol
5732                .start
5733                .ok_or_else(|| anyhow!("invalid start"))?;
5734            let end = serialized_symbol
5735                .end
5736                .ok_or_else(|| anyhow!("invalid end"))?;
5737            let kind = unsafe { mem::transmute(serialized_symbol.kind) };
5738            let path = ProjectPath {
5739                worktree_id,
5740                path: PathBuf::from(serialized_symbol.path).into(),
5741            };
5742            let language = languages.select_language(&path.path);
5743            Ok(Symbol {
5744                language_server_name: LanguageServerName(
5745                    serialized_symbol.language_server_name.into(),
5746                ),
5747                source_worktree_id,
5748                path,
5749                label: {
5750                    match language {
5751                        Some(language) => {
5752                            language
5753                                .label_for_symbol(&serialized_symbol.name, kind)
5754                                .await
5755                        }
5756                        None => None,
5757                    }
5758                    .unwrap_or_else(|| CodeLabel::plain(serialized_symbol.name.clone(), None))
5759                },
5760
5761                name: serialized_symbol.name,
5762                range: Unclipped(PointUtf16::new(start.row, start.column))
5763                    ..Unclipped(PointUtf16::new(end.row, end.column)),
5764                kind,
5765                signature: serialized_symbol
5766                    .signature
5767                    .try_into()
5768                    .map_err(|_| anyhow!("invalid signature"))?,
5769            })
5770        }
5771    }
5772
5773    async fn handle_buffer_saved(
5774        this: ModelHandle<Self>,
5775        envelope: TypedEnvelope<proto::BufferSaved>,
5776        _: Arc<Client>,
5777        mut cx: AsyncAppContext,
5778    ) -> Result<()> {
5779        let version = deserialize_version(envelope.payload.version);
5780        let mtime = envelope
5781            .payload
5782            .mtime
5783            .ok_or_else(|| anyhow!("missing mtime"))?
5784            .into();
5785
5786        this.update(&mut cx, |this, cx| {
5787            let buffer = this
5788                .opened_buffers
5789                .get(&envelope.payload.buffer_id)
5790                .and_then(|buffer| buffer.upgrade(cx));
5791            if let Some(buffer) = buffer {
5792                buffer.update(cx, |buffer, cx| {
5793                    buffer.did_save(version, envelope.payload.fingerprint, mtime, None, cx);
5794                });
5795            }
5796            Ok(())
5797        })
5798    }
5799
5800    async fn handle_buffer_reloaded(
5801        this: ModelHandle<Self>,
5802        envelope: TypedEnvelope<proto::BufferReloaded>,
5803        _: Arc<Client>,
5804        mut cx: AsyncAppContext,
5805    ) -> Result<()> {
5806        let payload = envelope.payload;
5807        let version = deserialize_version(payload.version);
5808        let line_ending = deserialize_line_ending(
5809            proto::LineEnding::from_i32(payload.line_ending)
5810                .ok_or_else(|| anyhow!("missing line ending"))?,
5811        );
5812        let mtime = payload
5813            .mtime
5814            .ok_or_else(|| anyhow!("missing mtime"))?
5815            .into();
5816        this.update(&mut cx, |this, cx| {
5817            let buffer = this
5818                .opened_buffers
5819                .get(&payload.buffer_id)
5820                .and_then(|buffer| buffer.upgrade(cx));
5821            if let Some(buffer) = buffer {
5822                buffer.update(cx, |buffer, cx| {
5823                    buffer.did_reload(version, payload.fingerprint, line_ending, mtime, cx);
5824                });
5825            }
5826            Ok(())
5827        })
5828    }
5829
5830    #[allow(clippy::type_complexity)]
5831    fn edits_from_lsp(
5832        &mut self,
5833        buffer: &ModelHandle<Buffer>,
5834        lsp_edits: impl 'static + Send + IntoIterator<Item = lsp::TextEdit>,
5835        version: Option<i32>,
5836        cx: &mut ModelContext<Self>,
5837    ) -> Task<Result<Vec<(Range<Anchor>, String)>>> {
5838        let snapshot = self.buffer_snapshot_for_lsp_version(buffer, version, cx);
5839        cx.background().spawn(async move {
5840            let snapshot = snapshot?;
5841            let mut lsp_edits = lsp_edits
5842                .into_iter()
5843                .map(|edit| (range_from_lsp(edit.range), edit.new_text))
5844                .collect::<Vec<_>>();
5845            lsp_edits.sort_by_key(|(range, _)| range.start);
5846
5847            let mut lsp_edits = lsp_edits.into_iter().peekable();
5848            let mut edits = Vec::new();
5849            while let Some((range, mut new_text)) = lsp_edits.next() {
5850                // Clip invalid ranges provided by the language server.
5851                let mut range = snapshot.clip_point_utf16(range.start, Bias::Left)
5852                    ..snapshot.clip_point_utf16(range.end, Bias::Left);
5853
5854                // Combine any LSP edits that are adjacent.
5855                //
5856                // Also, combine LSP edits that are separated from each other by only
5857                // a newline. This is important because for some code actions,
5858                // Rust-analyzer rewrites the entire buffer via a series of edits that
5859                // are separated by unchanged newline characters.
5860                //
5861                // In order for the diffing logic below to work properly, any edits that
5862                // cancel each other out must be combined into one.
5863                while let Some((next_range, next_text)) = lsp_edits.peek() {
5864                    if next_range.start.0 > range.end {
5865                        if next_range.start.0.row > range.end.row + 1
5866                            || next_range.start.0.column > 0
5867                            || snapshot.clip_point_utf16(
5868                                Unclipped(PointUtf16::new(range.end.row, u32::MAX)),
5869                                Bias::Left,
5870                            ) > range.end
5871                        {
5872                            break;
5873                        }
5874                        new_text.push('\n');
5875                    }
5876                    range.end = snapshot.clip_point_utf16(next_range.end, Bias::Left);
5877                    new_text.push_str(next_text);
5878                    lsp_edits.next();
5879                }
5880
5881                // For multiline edits, perform a diff of the old and new text so that
5882                // we can identify the changes more precisely, preserving the locations
5883                // of any anchors positioned in the unchanged regions.
5884                if range.end.row > range.start.row {
5885                    let mut offset = range.start.to_offset(&snapshot);
5886                    let old_text = snapshot.text_for_range(range).collect::<String>();
5887
5888                    let diff = TextDiff::from_lines(old_text.as_str(), &new_text);
5889                    let mut moved_since_edit = true;
5890                    for change in diff.iter_all_changes() {
5891                        let tag = change.tag();
5892                        let value = change.value();
5893                        match tag {
5894                            ChangeTag::Equal => {
5895                                offset += value.len();
5896                                moved_since_edit = true;
5897                            }
5898                            ChangeTag::Delete => {
5899                                let start = snapshot.anchor_after(offset);
5900                                let end = snapshot.anchor_before(offset + value.len());
5901                                if moved_since_edit {
5902                                    edits.push((start..end, String::new()));
5903                                } else {
5904                                    edits.last_mut().unwrap().0.end = end;
5905                                }
5906                                offset += value.len();
5907                                moved_since_edit = false;
5908                            }
5909                            ChangeTag::Insert => {
5910                                if moved_since_edit {
5911                                    let anchor = snapshot.anchor_after(offset);
5912                                    edits.push((anchor..anchor, value.to_string()));
5913                                } else {
5914                                    edits.last_mut().unwrap().1.push_str(value);
5915                                }
5916                                moved_since_edit = false;
5917                            }
5918                        }
5919                    }
5920                } else if range.end == range.start {
5921                    let anchor = snapshot.anchor_after(range.start);
5922                    edits.push((anchor..anchor, new_text));
5923                } else {
5924                    let edit_start = snapshot.anchor_after(range.start);
5925                    let edit_end = snapshot.anchor_before(range.end);
5926                    edits.push((edit_start..edit_end, new_text));
5927                }
5928            }
5929
5930            Ok(edits)
5931        })
5932    }
5933
5934    fn buffer_snapshot_for_lsp_version(
5935        &mut self,
5936        buffer: &ModelHandle<Buffer>,
5937        version: Option<i32>,
5938        cx: &AppContext,
5939    ) -> Result<TextBufferSnapshot> {
5940        const OLD_VERSIONS_TO_RETAIN: i32 = 10;
5941
5942        if let Some(version) = version {
5943            let buffer_id = buffer.read(cx).remote_id();
5944            let snapshots = self
5945                .buffer_snapshots
5946                .get_mut(&buffer_id)
5947                .ok_or_else(|| anyhow!("no snapshot found for buffer {}", buffer_id))?;
5948            let mut found_snapshot = None;
5949            snapshots.retain(|(snapshot_version, snapshot)| {
5950                if snapshot_version + OLD_VERSIONS_TO_RETAIN < version {
5951                    false
5952                } else {
5953                    if *snapshot_version == version {
5954                        found_snapshot = Some(snapshot.clone());
5955                    }
5956                    true
5957                }
5958            });
5959
5960            found_snapshot.ok_or_else(|| {
5961                anyhow!(
5962                    "snapshot not found for buffer {} at version {}",
5963                    buffer_id,
5964                    version
5965                )
5966            })
5967        } else {
5968            Ok((buffer.read(cx)).text_snapshot())
5969        }
5970    }
5971
5972    fn language_server_for_buffer(
5973        &self,
5974        buffer: &Buffer,
5975        cx: &AppContext,
5976    ) -> Option<(&Arc<CachedLspAdapter>, &Arc<LanguageServer>)> {
5977        if let Some((file, language)) = File::from_dyn(buffer.file()).zip(buffer.language()) {
5978            let name = language.lsp_adapter()?.name.clone();
5979            let worktree_id = file.worktree_id(cx);
5980            let key = (worktree_id, name);
5981
5982            if let Some(server_id) = self.language_server_ids.get(&key) {
5983                if let Some(LanguageServerState::Running {
5984                    adapter, server, ..
5985                }) = self.language_servers.get(server_id)
5986                {
5987                    return Some((adapter, server));
5988                }
5989            }
5990        }
5991
5992        None
5993    }
5994}
5995
5996impl WorktreeHandle {
5997    pub fn upgrade(&self, cx: &AppContext) -> Option<ModelHandle<Worktree>> {
5998        match self {
5999            WorktreeHandle::Strong(handle) => Some(handle.clone()),
6000            WorktreeHandle::Weak(handle) => handle.upgrade(cx),
6001        }
6002    }
6003}
6004
6005impl OpenBuffer {
6006    pub fn upgrade(&self, cx: &impl UpgradeModelHandle) -> Option<ModelHandle<Buffer>> {
6007        match self {
6008            OpenBuffer::Strong(handle) => Some(handle.clone()),
6009            OpenBuffer::Weak(handle) => handle.upgrade(cx),
6010            OpenBuffer::Operations(_) => None,
6011        }
6012    }
6013}
6014
6015pub struct PathMatchCandidateSet {
6016    pub snapshot: Snapshot,
6017    pub include_ignored: bool,
6018    pub include_root_name: bool,
6019}
6020
6021impl<'a> fuzzy::PathMatchCandidateSet<'a> for PathMatchCandidateSet {
6022    type Candidates = PathMatchCandidateSetIter<'a>;
6023
6024    fn id(&self) -> usize {
6025        self.snapshot.id().to_usize()
6026    }
6027
6028    fn len(&self) -> usize {
6029        if self.include_ignored {
6030            self.snapshot.file_count()
6031        } else {
6032            self.snapshot.visible_file_count()
6033        }
6034    }
6035
6036    fn prefix(&self) -> Arc<str> {
6037        if self.snapshot.root_entry().map_or(false, |e| e.is_file()) {
6038            self.snapshot.root_name().into()
6039        } else if self.include_root_name {
6040            format!("{}/", self.snapshot.root_name()).into()
6041        } else {
6042            "".into()
6043        }
6044    }
6045
6046    fn candidates(&'a self, start: usize) -> Self::Candidates {
6047        PathMatchCandidateSetIter {
6048            traversal: self.snapshot.files(self.include_ignored, start),
6049        }
6050    }
6051}
6052
6053pub struct PathMatchCandidateSetIter<'a> {
6054    traversal: Traversal<'a>,
6055}
6056
6057impl<'a> Iterator for PathMatchCandidateSetIter<'a> {
6058    type Item = fuzzy::PathMatchCandidate<'a>;
6059
6060    fn next(&mut self) -> Option<Self::Item> {
6061        self.traversal.next().map(|entry| {
6062            if let EntryKind::File(char_bag) = entry.kind {
6063                fuzzy::PathMatchCandidate {
6064                    path: &entry.path,
6065                    char_bag,
6066                }
6067            } else {
6068                unreachable!()
6069            }
6070        })
6071    }
6072}
6073
6074impl Entity for Project {
6075    type Event = Event;
6076
6077    fn release(&mut self, _: &mut gpui::MutableAppContext) {
6078        match &self.client_state {
6079            Some(ProjectClientState::Local { remote_id, .. }) => {
6080                self.client
6081                    .send(proto::UnshareProject {
6082                        project_id: *remote_id,
6083                    })
6084                    .log_err();
6085            }
6086            Some(ProjectClientState::Remote { remote_id, .. }) => {
6087                self.client
6088                    .send(proto::LeaveProject {
6089                        project_id: *remote_id,
6090                    })
6091                    .log_err();
6092            }
6093            _ => {}
6094        }
6095    }
6096
6097    fn app_will_quit(
6098        &mut self,
6099        _: &mut MutableAppContext,
6100    ) -> Option<std::pin::Pin<Box<dyn 'static + Future<Output = ()>>>> {
6101        let shutdown_futures = self
6102            .language_servers
6103            .drain()
6104            .map(|(_, server_state)| async {
6105                match server_state {
6106                    LanguageServerState::Running { server, .. } => server.shutdown()?.await,
6107                    LanguageServerState::Starting(starting_server) => {
6108                        starting_server.await?.shutdown()?.await
6109                    }
6110                }
6111            })
6112            .collect::<Vec<_>>();
6113
6114        Some(
6115            async move {
6116                futures::future::join_all(shutdown_futures).await;
6117            }
6118            .boxed(),
6119        )
6120    }
6121}
6122
6123impl Collaborator {
6124    fn from_proto(message: proto::Collaborator) -> Result<Self> {
6125        Ok(Self {
6126            peer_id: message.peer_id.ok_or_else(|| anyhow!("invalid peer id"))?,
6127            replica_id: message.replica_id as ReplicaId,
6128        })
6129    }
6130}
6131
6132impl<P: AsRef<Path>> From<(WorktreeId, P)> for ProjectPath {
6133    fn from((worktree_id, path): (WorktreeId, P)) -> Self {
6134        Self {
6135            worktree_id,
6136            path: path.as_ref().into(),
6137        }
6138    }
6139}
6140
6141fn serialize_symbol(symbol: &Symbol) -> proto::Symbol {
6142    proto::Symbol {
6143        language_server_name: symbol.language_server_name.0.to_string(),
6144        source_worktree_id: symbol.source_worktree_id.to_proto(),
6145        worktree_id: symbol.path.worktree_id.to_proto(),
6146        path: symbol.path.path.to_string_lossy().to_string(),
6147        name: symbol.name.clone(),
6148        kind: unsafe { mem::transmute(symbol.kind) },
6149        start: Some(proto::PointUtf16 {
6150            row: symbol.range.start.0.row,
6151            column: symbol.range.start.0.column,
6152        }),
6153        end: Some(proto::PointUtf16 {
6154            row: symbol.range.end.0.row,
6155            column: symbol.range.end.0.column,
6156        }),
6157        signature: symbol.signature.to_vec(),
6158    }
6159}
6160
6161fn relativize_path(base: &Path, path: &Path) -> PathBuf {
6162    let mut path_components = path.components();
6163    let mut base_components = base.components();
6164    let mut components: Vec<Component> = Vec::new();
6165    loop {
6166        match (path_components.next(), base_components.next()) {
6167            (None, None) => break,
6168            (Some(a), None) => {
6169                components.push(a);
6170                components.extend(path_components.by_ref());
6171                break;
6172            }
6173            (None, _) => components.push(Component::ParentDir),
6174            (Some(a), Some(b)) if components.is_empty() && a == b => (),
6175            (Some(a), Some(b)) if b == Component::CurDir => components.push(a),
6176            (Some(a), Some(_)) => {
6177                components.push(Component::ParentDir);
6178                for _ in base_components {
6179                    components.push(Component::ParentDir);
6180                }
6181                components.push(a);
6182                components.extend(path_components.by_ref());
6183                break;
6184            }
6185        }
6186    }
6187    components.iter().map(|c| c.as_os_str()).collect()
6188}
6189
6190impl Item for Buffer {
6191    fn entry_id(&self, cx: &AppContext) -> Option<ProjectEntryId> {
6192        File::from_dyn(self.file()).and_then(|file| file.project_entry_id(cx))
6193    }
6194}