1mod ignore;
   2mod lsp_command;
   3mod lsp_glob_set;
   4pub mod search;
   5pub mod terminals;
   6pub mod worktree;
   7
   8#[cfg(test)]
   9mod project_tests;
  10
  11use anyhow::{anyhow, Context, Result};
  12use client::{proto, Client, TypedEnvelope, UserStore};
  13use clock::ReplicaId;
  14use collections::{hash_map, BTreeMap, HashMap, HashSet};
  15use futures::{
  16    channel::mpsc::{self, UnboundedReceiver},
  17    future::{try_join_all, Shared},
  18    AsyncWriteExt, Future, FutureExt, StreamExt, TryFutureExt,
  19};
  20use gpui::{
  21    AnyModelHandle, AppContext, AsyncAppContext, Entity, ModelContext, ModelHandle, Task,
  22    UpgradeModelHandle, WeakModelHandle,
  23};
  24use language::{
  25    point_to_lsp,
  26    proto::{
  27        deserialize_anchor, deserialize_fingerprint, deserialize_line_ending, deserialize_version,
  28        serialize_anchor, serialize_version,
  29    },
  30    range_from_lsp, range_to_lsp, Anchor, Bias, Buffer, CachedLspAdapter, CharKind, CodeAction,
  31    CodeLabel, Completion, Diagnostic, DiagnosticEntry, DiagnosticSet, Diff, Event as BufferEvent,
  32    File as _, Language, LanguageRegistry, LanguageServerName, LocalFile, OffsetRangeExt,
  33    Operation, Patch, PointUtf16, RopeFingerprint, TextBufferSnapshot, ToOffset, ToPointUtf16,
  34    Transaction, Unclipped,
  35};
  36use lsp::{
  37    DiagnosticSeverity, DiagnosticTag, DidChangeWatchedFilesRegistrationOptions,
  38    DocumentHighlightKind, LanguageServer, LanguageString, MarkedString,
  39};
  40use lsp_command::*;
  41use lsp_glob_set::LspGlobSet;
  42use postage::watch;
  43use rand::prelude::*;
  44use search::SearchQuery;
  45use serde::Serialize;
  46use settings::{FormatOnSave, Formatter, Settings};
  47use sha2::{Digest, Sha256};
  48use similar::{ChangeTag, TextDiff};
  49use std::{
  50    cell::RefCell,
  51    cmp::{self, Ordering},
  52    convert::TryInto,
  53    hash::Hash,
  54    mem,
  55    num::NonZeroU32,
  56    ops::Range,
  57    path::{Component, Path, PathBuf},
  58    rc::Rc,
  59    str,
  60    sync::{
  61        atomic::{AtomicUsize, Ordering::SeqCst},
  62        Arc,
  63    },
  64    time::{Duration, Instant, SystemTime},
  65};
  66use terminals::Terminals;
  67
  68use util::{debug_panic, defer, merge_json_value_into, post_inc, ResultExt, TryFutureExt as _};
  69
  70pub use fs::*;
  71pub use worktree::*;
  72
  73pub trait Item {
  74    fn entry_id(&self, cx: &AppContext) -> Option<ProjectEntryId>;
  75    fn project_path(&self, cx: &AppContext) -> Option<ProjectPath>;
  76}
  77
  78// Language server state is stored across 3 collections:
  79//     language_servers =>
  80//         a mapping from unique server id to LanguageServerState which can either be a task for a
  81//         server in the process of starting, or a running server with adapter and language server arcs
  82//     language_server_ids => a mapping from worktreeId and server name to the unique server id
  83//     language_server_statuses => a mapping from unique server id to the current server status
  84//
  85// Multiple worktrees can map to the same language server for example when you jump to the definition
  86// of a file in the standard library. So language_server_ids is used to look up which server is active
  87// for a given worktree and language server name
  88//
  89// When starting a language server, first the id map is checked to make sure a server isn't already available
  90// for that worktree. If there is one, it finishes early. Otherwise, a new id is allocated and and
  91// the Starting variant of LanguageServerState is stored in the language_servers map.
  92pub struct Project {
  93    worktrees: Vec<WorktreeHandle>,
  94    active_entry: Option<ProjectEntryId>,
  95    buffer_changes_tx: mpsc::UnboundedSender<BufferMessage>,
  96    languages: Arc<LanguageRegistry>,
  97    language_servers: HashMap<usize, LanguageServerState>,
  98    language_server_ids: HashMap<(WorktreeId, LanguageServerName), usize>,
  99    language_server_statuses: BTreeMap<usize, LanguageServerStatus>,
 100    last_workspace_edits_by_language_server: HashMap<usize, ProjectTransaction>,
 101    next_language_server_id: usize,
 102    client: Arc<client::Client>,
 103    next_entry_id: Arc<AtomicUsize>,
 104    join_project_response_message_id: u32,
 105    next_diagnostic_group_id: usize,
 106    user_store: ModelHandle<UserStore>,
 107    fs: Arc<dyn Fs>,
 108    client_state: Option<ProjectClientState>,
 109    collaborators: HashMap<proto::PeerId, Collaborator>,
 110    client_subscriptions: Vec<client::Subscription>,
 111    _subscriptions: Vec<gpui::Subscription>,
 112    opened_buffer: (watch::Sender<()>, watch::Receiver<()>),
 113    shared_buffers: HashMap<proto::PeerId, HashSet<u64>>,
 114    #[allow(clippy::type_complexity)]
 115    loading_buffers_by_path: HashMap<
 116        ProjectPath,
 117        postage::watch::Receiver<Option<Result<ModelHandle<Buffer>, Arc<anyhow::Error>>>>,
 118    >,
 119    #[allow(clippy::type_complexity)]
 120    loading_local_worktrees:
 121        HashMap<Arc<Path>, Shared<Task<Result<ModelHandle<Worktree>, Arc<anyhow::Error>>>>>,
 122    opened_buffers: HashMap<u64, OpenBuffer>,
 123    /// A mapping from a buffer ID to None means that we've started waiting for an ID but haven't finished loading it.
 124    /// Used for re-issuing buffer requests when peers temporarily disconnect
 125    incomplete_remote_buffers: HashMap<u64, Option<ModelHandle<Buffer>>>,
 126    buffer_snapshots: HashMap<u64, Vec<(i32, TextBufferSnapshot)>>,
 127    buffers_being_formatted: HashSet<usize>,
 128    nonce: u128,
 129    _maintain_buffer_languages: Task<()>,
 130    _maintain_workspace_config: Task<()>,
 131    terminals: Terminals,
 132}
 133
 134enum BufferMessage {
 135    Operation {
 136        buffer_id: u64,
 137        operation: proto::Operation,
 138    },
 139    Resync,
 140}
 141
 142enum LocalProjectUpdate {
 143    WorktreesChanged,
 144    CreateBufferForPeer {
 145        peer_id: proto::PeerId,
 146        buffer_id: u64,
 147    },
 148}
 149
 150enum OpenBuffer {
 151    Strong(ModelHandle<Buffer>),
 152    Weak(WeakModelHandle<Buffer>),
 153    Operations(Vec<Operation>),
 154}
 155
 156enum WorktreeHandle {
 157    Strong(ModelHandle<Worktree>),
 158    Weak(WeakModelHandle<Worktree>),
 159}
 160
 161enum ProjectClientState {
 162    Local {
 163        remote_id: u64,
 164        updates_tx: mpsc::UnboundedSender<LocalProjectUpdate>,
 165        _send_updates: Task<()>,
 166    },
 167    Remote {
 168        sharing_has_stopped: bool,
 169        remote_id: u64,
 170        replica_id: ReplicaId,
 171    },
 172}
 173
 174#[derive(Clone, Debug)]
 175pub struct Collaborator {
 176    pub peer_id: proto::PeerId,
 177    pub replica_id: ReplicaId,
 178}
 179
 180#[derive(Clone, Debug, PartialEq, Eq)]
 181pub enum Event {
 182    ActiveEntryChanged(Option<ProjectEntryId>),
 183    WorktreeAdded,
 184    WorktreeRemoved(WorktreeId),
 185    DiskBasedDiagnosticsStarted {
 186        language_server_id: usize,
 187    },
 188    DiskBasedDiagnosticsFinished {
 189        language_server_id: usize,
 190    },
 191    DiagnosticsUpdated {
 192        path: ProjectPath,
 193        language_server_id: usize,
 194    },
 195    RemoteIdChanged(Option<u64>),
 196    DisconnectedFromHost,
 197    Closed,
 198    CollaboratorUpdated {
 199        old_peer_id: proto::PeerId,
 200        new_peer_id: proto::PeerId,
 201    },
 202    CollaboratorLeft(proto::PeerId),
 203}
 204
 205pub enum LanguageServerState {
 206    Starting(Task<Option<Arc<LanguageServer>>>),
 207    Running {
 208        language: Arc<Language>,
 209        adapter: Arc<CachedLspAdapter>,
 210        server: Arc<LanguageServer>,
 211        watched_paths: LspGlobSet,
 212        simulate_disk_based_diagnostics_completion: Option<Task<()>>,
 213    },
 214}
 215
 216#[derive(Serialize)]
 217pub struct LanguageServerStatus {
 218    pub name: String,
 219    pub pending_work: BTreeMap<String, LanguageServerProgress>,
 220    pub has_pending_diagnostic_updates: bool,
 221    progress_tokens: HashSet<String>,
 222}
 223
 224#[derive(Clone, Debug, Serialize)]
 225pub struct LanguageServerProgress {
 226    pub message: Option<String>,
 227    pub percentage: Option<usize>,
 228    #[serde(skip_serializing)]
 229    pub last_update_at: Instant,
 230}
 231
 232#[derive(Clone, Debug, Eq, PartialEq, Hash, PartialOrd, Ord)]
 233pub struct ProjectPath {
 234    pub worktree_id: WorktreeId,
 235    pub path: Arc<Path>,
 236}
 237
 238#[derive(Copy, Clone, Debug, Default, PartialEq, Serialize)]
 239pub struct DiagnosticSummary {
 240    pub language_server_id: usize,
 241    pub error_count: usize,
 242    pub warning_count: usize,
 243}
 244
 245#[derive(Debug, Clone)]
 246pub struct Location {
 247    pub buffer: ModelHandle<Buffer>,
 248    pub range: Range<language::Anchor>,
 249}
 250
 251#[derive(Debug, Clone)]
 252pub struct LocationLink {
 253    pub origin: Option<Location>,
 254    pub target: Location,
 255}
 256
 257#[derive(Debug)]
 258pub struct DocumentHighlight {
 259    pub range: Range<language::Anchor>,
 260    pub kind: DocumentHighlightKind,
 261}
 262
 263#[derive(Clone, Debug)]
 264pub struct Symbol {
 265    pub language_server_name: LanguageServerName,
 266    pub source_worktree_id: WorktreeId,
 267    pub path: ProjectPath,
 268    pub label: CodeLabel,
 269    pub name: String,
 270    pub kind: lsp::SymbolKind,
 271    pub range: Range<Unclipped<PointUtf16>>,
 272    pub signature: [u8; 32],
 273}
 274
 275#[derive(Clone, Debug, PartialEq)]
 276pub struct HoverBlock {
 277    pub text: String,
 278    pub language: Option<String>,
 279}
 280
 281impl HoverBlock {
 282    fn try_new(marked_string: MarkedString) -> Option<Self> {
 283        let result = match marked_string {
 284            MarkedString::LanguageString(LanguageString { language, value }) => HoverBlock {
 285                text: value,
 286                language: Some(language),
 287            },
 288            MarkedString::String(text) => HoverBlock {
 289                text,
 290                language: None,
 291            },
 292        };
 293        if result.text.is_empty() {
 294            None
 295        } else {
 296            Some(result)
 297        }
 298    }
 299}
 300
 301#[derive(Debug)]
 302pub struct Hover {
 303    pub contents: Vec<HoverBlock>,
 304    pub range: Option<Range<language::Anchor>>,
 305}
 306
 307#[derive(Default)]
 308pub struct ProjectTransaction(pub HashMap<ModelHandle<Buffer>, language::Transaction>);
 309
 310impl DiagnosticSummary {
 311    fn new<'a, T: 'a>(
 312        language_server_id: usize,
 313        diagnostics: impl IntoIterator<Item = &'a DiagnosticEntry<T>>,
 314    ) -> Self {
 315        let mut this = Self {
 316            language_server_id,
 317            error_count: 0,
 318            warning_count: 0,
 319        };
 320
 321        for entry in diagnostics {
 322            if entry.diagnostic.is_primary {
 323                match entry.diagnostic.severity {
 324                    DiagnosticSeverity::ERROR => this.error_count += 1,
 325                    DiagnosticSeverity::WARNING => this.warning_count += 1,
 326                    _ => {}
 327                }
 328            }
 329        }
 330
 331        this
 332    }
 333
 334    pub fn is_empty(&self) -> bool {
 335        self.error_count == 0 && self.warning_count == 0
 336    }
 337
 338    pub fn to_proto(&self, path: &Path) -> proto::DiagnosticSummary {
 339        proto::DiagnosticSummary {
 340            path: path.to_string_lossy().to_string(),
 341            language_server_id: self.language_server_id as u64,
 342            error_count: self.error_count as u32,
 343            warning_count: self.warning_count as u32,
 344        }
 345    }
 346}
 347
 348#[derive(Clone, Copy, Debug, Default, Hash, PartialEq, Eq, PartialOrd, Ord)]
 349pub struct ProjectEntryId(usize);
 350
 351impl ProjectEntryId {
 352    pub const MAX: Self = Self(usize::MAX);
 353
 354    pub fn new(counter: &AtomicUsize) -> Self {
 355        Self(counter.fetch_add(1, SeqCst))
 356    }
 357
 358    pub fn from_proto(id: u64) -> Self {
 359        Self(id as usize)
 360    }
 361
 362    pub fn to_proto(&self) -> u64 {
 363        self.0 as u64
 364    }
 365
 366    pub fn to_usize(&self) -> usize {
 367        self.0
 368    }
 369}
 370
 371#[derive(Debug, Clone, Copy, PartialEq, Eq)]
 372pub enum FormatTrigger {
 373    Save,
 374    Manual,
 375}
 376
 377impl FormatTrigger {
 378    fn from_proto(value: i32) -> FormatTrigger {
 379        match value {
 380            0 => FormatTrigger::Save,
 381            1 => FormatTrigger::Manual,
 382            _ => FormatTrigger::Save,
 383        }
 384    }
 385}
 386
 387impl Project {
 388    pub fn init(client: &Arc<Client>) {
 389        client.add_model_message_handler(Self::handle_add_collaborator);
 390        client.add_model_message_handler(Self::handle_update_project_collaborator);
 391        client.add_model_message_handler(Self::handle_remove_collaborator);
 392        client.add_model_message_handler(Self::handle_buffer_reloaded);
 393        client.add_model_message_handler(Self::handle_buffer_saved);
 394        client.add_model_message_handler(Self::handle_start_language_server);
 395        client.add_model_message_handler(Self::handle_update_language_server);
 396        client.add_model_message_handler(Self::handle_update_project);
 397        client.add_model_message_handler(Self::handle_unshare_project);
 398        client.add_model_message_handler(Self::handle_create_buffer_for_peer);
 399        client.add_model_message_handler(Self::handle_update_buffer_file);
 400        client.add_model_request_handler(Self::handle_update_buffer);
 401        client.add_model_message_handler(Self::handle_update_diagnostic_summary);
 402        client.add_model_message_handler(Self::handle_update_worktree);
 403        client.add_model_request_handler(Self::handle_create_project_entry);
 404        client.add_model_request_handler(Self::handle_rename_project_entry);
 405        client.add_model_request_handler(Self::handle_copy_project_entry);
 406        client.add_model_request_handler(Self::handle_delete_project_entry);
 407        client.add_model_request_handler(Self::handle_apply_additional_edits_for_completion);
 408        client.add_model_request_handler(Self::handle_apply_code_action);
 409        client.add_model_request_handler(Self::handle_reload_buffers);
 410        client.add_model_request_handler(Self::handle_synchronize_buffers);
 411        client.add_model_request_handler(Self::handle_format_buffers);
 412        client.add_model_request_handler(Self::handle_get_code_actions);
 413        client.add_model_request_handler(Self::handle_get_completions);
 414        client.add_model_request_handler(Self::handle_lsp_command::<GetHover>);
 415        client.add_model_request_handler(Self::handle_lsp_command::<GetDefinition>);
 416        client.add_model_request_handler(Self::handle_lsp_command::<GetTypeDefinition>);
 417        client.add_model_request_handler(Self::handle_lsp_command::<GetDocumentHighlights>);
 418        client.add_model_request_handler(Self::handle_lsp_command::<GetReferences>);
 419        client.add_model_request_handler(Self::handle_lsp_command::<PrepareRename>);
 420        client.add_model_request_handler(Self::handle_lsp_command::<PerformRename>);
 421        client.add_model_request_handler(Self::handle_search_project);
 422        client.add_model_request_handler(Self::handle_get_project_symbols);
 423        client.add_model_request_handler(Self::handle_open_buffer_for_symbol);
 424        client.add_model_request_handler(Self::handle_open_buffer_by_id);
 425        client.add_model_request_handler(Self::handle_open_buffer_by_path);
 426        client.add_model_request_handler(Self::handle_save_buffer);
 427        client.add_model_message_handler(Self::handle_update_diff_base);
 428    }
 429
 430    pub fn local(
 431        client: Arc<Client>,
 432        user_store: ModelHandle<UserStore>,
 433        languages: Arc<LanguageRegistry>,
 434        fs: Arc<dyn Fs>,
 435        cx: &mut AppContext,
 436    ) -> ModelHandle<Self> {
 437        cx.add_model(|cx: &mut ModelContext<Self>| {
 438            let (tx, rx) = mpsc::unbounded();
 439            cx.spawn_weak(|this, cx| Self::send_buffer_messages(this, rx, cx))
 440                .detach();
 441            Self {
 442                worktrees: Default::default(),
 443                buffer_changes_tx: tx,
 444                collaborators: Default::default(),
 445                opened_buffers: Default::default(),
 446                shared_buffers: Default::default(),
 447                incomplete_remote_buffers: Default::default(),
 448                loading_buffers_by_path: Default::default(),
 449                loading_local_worktrees: Default::default(),
 450                buffer_snapshots: Default::default(),
 451                join_project_response_message_id: 0,
 452                client_state: None,
 453                opened_buffer: watch::channel(),
 454                client_subscriptions: Vec::new(),
 455                _subscriptions: vec![cx.observe_global::<Settings, _>(Self::on_settings_changed)],
 456                _maintain_buffer_languages: Self::maintain_buffer_languages(&languages, cx),
 457                _maintain_workspace_config: Self::maintain_workspace_config(languages.clone(), cx),
 458                active_entry: None,
 459                languages,
 460                client,
 461                user_store,
 462                fs,
 463                next_entry_id: Default::default(),
 464                next_diagnostic_group_id: Default::default(),
 465                language_servers: Default::default(),
 466                language_server_ids: Default::default(),
 467                language_server_statuses: Default::default(),
 468                last_workspace_edits_by_language_server: Default::default(),
 469                buffers_being_formatted: Default::default(),
 470                next_language_server_id: 0,
 471                nonce: StdRng::from_entropy().gen(),
 472                terminals: Terminals {
 473                    local_handles: Vec::new(),
 474                },
 475            }
 476        })
 477    }
 478
 479    pub async fn remote(
 480        remote_id: u64,
 481        client: Arc<Client>,
 482        user_store: ModelHandle<UserStore>,
 483        languages: Arc<LanguageRegistry>,
 484        fs: Arc<dyn Fs>,
 485        mut cx: AsyncAppContext,
 486    ) -> Result<ModelHandle<Self>> {
 487        client.authenticate_and_connect(true, &cx).await?;
 488
 489        let subscription = client.subscribe_to_entity(remote_id)?;
 490        let response = client
 491            .request_envelope(proto::JoinProject {
 492                project_id: remote_id,
 493            })
 494            .await?;
 495        let this = cx.add_model(|cx| {
 496            let replica_id = response.payload.replica_id as ReplicaId;
 497
 498            let mut worktrees = Vec::new();
 499            for worktree in response.payload.worktrees {
 500                let worktree = cx.update(|cx| {
 501                    Worktree::remote(remote_id, replica_id, worktree, client.clone(), cx)
 502                });
 503                worktrees.push(worktree);
 504            }
 505
 506            let (tx, rx) = mpsc::unbounded();
 507            cx.spawn_weak(|this, cx| Self::send_buffer_messages(this, rx, cx))
 508                .detach();
 509            let mut this = Self {
 510                worktrees: Vec::new(),
 511                buffer_changes_tx: tx,
 512                loading_buffers_by_path: Default::default(),
 513                opened_buffer: watch::channel(),
 514                shared_buffers: Default::default(),
 515                incomplete_remote_buffers: Default::default(),
 516                loading_local_worktrees: Default::default(),
 517                active_entry: None,
 518                collaborators: Default::default(),
 519                join_project_response_message_id: response.message_id,
 520                _maintain_buffer_languages: Self::maintain_buffer_languages(&languages, cx),
 521                _maintain_workspace_config: Self::maintain_workspace_config(languages.clone(), cx),
 522                languages,
 523                user_store: user_store.clone(),
 524                fs,
 525                next_entry_id: Default::default(),
 526                next_diagnostic_group_id: Default::default(),
 527                client_subscriptions: Default::default(),
 528                _subscriptions: Default::default(),
 529                client: client.clone(),
 530                client_state: Some(ProjectClientState::Remote {
 531                    sharing_has_stopped: false,
 532                    remote_id,
 533                    replica_id,
 534                }),
 535                language_servers: Default::default(),
 536                language_server_ids: Default::default(),
 537                language_server_statuses: response
 538                    .payload
 539                    .language_servers
 540                    .into_iter()
 541                    .map(|server| {
 542                        (
 543                            server.id as usize,
 544                            LanguageServerStatus {
 545                                name: server.name,
 546                                pending_work: Default::default(),
 547                                has_pending_diagnostic_updates: false,
 548                                progress_tokens: Default::default(),
 549                            },
 550                        )
 551                    })
 552                    .collect(),
 553                last_workspace_edits_by_language_server: Default::default(),
 554                next_language_server_id: 0,
 555                opened_buffers: Default::default(),
 556                buffers_being_formatted: Default::default(),
 557                buffer_snapshots: Default::default(),
 558                nonce: StdRng::from_entropy().gen(),
 559                terminals: Terminals {
 560                    local_handles: Vec::new(),
 561                },
 562            };
 563            for worktree in worktrees {
 564                let _ = this.add_worktree(&worktree, cx);
 565            }
 566            this
 567        });
 568        let subscription = subscription.set_model(&this, &mut cx);
 569
 570        let user_ids = response
 571            .payload
 572            .collaborators
 573            .iter()
 574            .map(|peer| peer.user_id)
 575            .collect();
 576        user_store
 577            .update(&mut cx, |user_store, cx| user_store.get_users(user_ids, cx))
 578            .await?;
 579
 580        this.update(&mut cx, |this, cx| {
 581            this.set_collaborators_from_proto(response.payload.collaborators, cx)?;
 582            this.client_subscriptions.push(subscription);
 583            anyhow::Ok(())
 584        })?;
 585
 586        Ok(this)
 587    }
 588
 589    #[cfg(any(test, feature = "test-support"))]
 590    pub async fn test(
 591        fs: Arc<dyn Fs>,
 592        root_paths: impl IntoIterator<Item = &Path>,
 593        cx: &mut gpui::TestAppContext,
 594    ) -> ModelHandle<Project> {
 595        if !cx.read(|cx| cx.has_global::<Settings>()) {
 596            cx.update(|cx| {
 597                cx.set_global(Settings::test(cx));
 598            });
 599        }
 600
 601        let mut languages = LanguageRegistry::test();
 602        languages.set_executor(cx.background());
 603        let http_client = util::http::FakeHttpClient::with_404_response();
 604        let client = cx.update(|cx| client::Client::new(http_client.clone(), cx));
 605        let user_store = cx.add_model(|cx| UserStore::new(client.clone(), http_client, cx));
 606        let project =
 607            cx.update(|cx| Project::local(client, user_store, Arc::new(languages), fs, cx));
 608        for path in root_paths {
 609            let (tree, _) = project
 610                .update(cx, |project, cx| {
 611                    project.find_or_create_local_worktree(path, true, cx)
 612                })
 613                .await
 614                .unwrap();
 615            tree.read_with(cx, |tree, _| tree.as_local().unwrap().scan_complete())
 616                .await;
 617        }
 618        project
 619    }
 620
 621    fn on_settings_changed(&mut self, cx: &mut ModelContext<Self>) {
 622        let settings = cx.global::<Settings>();
 623
 624        let mut language_servers_to_start = Vec::new();
 625        for buffer in self.opened_buffers.values() {
 626            if let Some(buffer) = buffer.upgrade(cx) {
 627                let buffer = buffer.read(cx);
 628                if let Some((file, language)) = File::from_dyn(buffer.file()).zip(buffer.language())
 629                {
 630                    if settings.enable_language_server(Some(&language.name())) {
 631                        let worktree = file.worktree.read(cx);
 632                        language_servers_to_start.push((
 633                            worktree.id(),
 634                            worktree.as_local().unwrap().abs_path().clone(),
 635                            language.clone(),
 636                        ));
 637                    }
 638                }
 639            }
 640        }
 641
 642        let mut language_servers_to_stop = Vec::new();
 643        for language in self.languages.to_vec() {
 644            if let Some(lsp_adapter) = language.lsp_adapter() {
 645                if !settings.enable_language_server(Some(&language.name())) {
 646                    let lsp_name = &lsp_adapter.name;
 647                    for (worktree_id, started_lsp_name) in self.language_server_ids.keys() {
 648                        if lsp_name == started_lsp_name {
 649                            language_servers_to_stop.push((*worktree_id, started_lsp_name.clone()));
 650                        }
 651                    }
 652                }
 653            }
 654        }
 655
 656        // Stop all newly-disabled language servers.
 657        for (worktree_id, adapter_name) in language_servers_to_stop {
 658            self.stop_language_server(worktree_id, adapter_name, cx)
 659                .detach();
 660        }
 661
 662        // Start all the newly-enabled language servers.
 663        for (worktree_id, worktree_path, language) in language_servers_to_start {
 664            self.start_language_server(worktree_id, worktree_path, language, cx);
 665        }
 666
 667        cx.notify();
 668    }
 669
 670    pub fn buffer_for_id(&self, remote_id: u64, cx: &AppContext) -> Option<ModelHandle<Buffer>> {
 671        self.opened_buffers
 672            .get(&remote_id)
 673            .and_then(|buffer| buffer.upgrade(cx))
 674    }
 675
 676    pub fn languages(&self) -> &Arc<LanguageRegistry> {
 677        &self.languages
 678    }
 679
 680    pub fn client(&self) -> Arc<Client> {
 681        self.client.clone()
 682    }
 683
 684    pub fn user_store(&self) -> ModelHandle<UserStore> {
 685        self.user_store.clone()
 686    }
 687
 688    #[cfg(any(test, feature = "test-support"))]
 689    pub fn opened_buffers(&self, cx: &AppContext) -> Vec<ModelHandle<Buffer>> {
 690        self.opened_buffers
 691            .values()
 692            .filter_map(|b| b.upgrade(cx))
 693            .collect()
 694    }
 695
 696    #[cfg(any(test, feature = "test-support"))]
 697    pub fn has_open_buffer(&self, path: impl Into<ProjectPath>, cx: &AppContext) -> bool {
 698        let path = path.into();
 699        if let Some(worktree) = self.worktree_for_id(path.worktree_id, cx) {
 700            self.opened_buffers.iter().any(|(_, buffer)| {
 701                if let Some(buffer) = buffer.upgrade(cx) {
 702                    if let Some(file) = File::from_dyn(buffer.read(cx).file()) {
 703                        if file.worktree == worktree && file.path() == &path.path {
 704                            return true;
 705                        }
 706                    }
 707                }
 708                false
 709            })
 710        } else {
 711            false
 712        }
 713    }
 714
 715    pub fn fs(&self) -> &Arc<dyn Fs> {
 716        &self.fs
 717    }
 718
 719    pub fn remote_id(&self) -> Option<u64> {
 720        match self.client_state.as_ref()? {
 721            ProjectClientState::Local { remote_id, .. }
 722            | ProjectClientState::Remote { remote_id, .. } => Some(*remote_id),
 723        }
 724    }
 725
 726    pub fn replica_id(&self) -> ReplicaId {
 727        match &self.client_state {
 728            Some(ProjectClientState::Remote { replica_id, .. }) => *replica_id,
 729            _ => 0,
 730        }
 731    }
 732
 733    fn metadata_changed(&mut self, cx: &mut ModelContext<Self>) {
 734        if let Some(ProjectClientState::Local { updates_tx, .. }) = &mut self.client_state {
 735            updates_tx
 736                .unbounded_send(LocalProjectUpdate::WorktreesChanged)
 737                .ok();
 738        }
 739        cx.notify();
 740    }
 741
 742    pub fn collaborators(&self) -> &HashMap<proto::PeerId, Collaborator> {
 743        &self.collaborators
 744    }
 745
 746    /// Collect all worktrees, including ones that don't appear in the project panel
 747    pub fn worktrees<'a>(
 748        &'a self,
 749        cx: &'a AppContext,
 750    ) -> impl 'a + DoubleEndedIterator<Item = ModelHandle<Worktree>> {
 751        self.worktrees
 752            .iter()
 753            .filter_map(move |worktree| worktree.upgrade(cx))
 754    }
 755
 756    /// Collect all user-visible worktrees, the ones that appear in the project panel
 757    pub fn visible_worktrees<'a>(
 758        &'a self,
 759        cx: &'a AppContext,
 760    ) -> impl 'a + DoubleEndedIterator<Item = ModelHandle<Worktree>> {
 761        self.worktrees.iter().filter_map(|worktree| {
 762            worktree.upgrade(cx).and_then(|worktree| {
 763                if worktree.read(cx).is_visible() {
 764                    Some(worktree)
 765                } else {
 766                    None
 767                }
 768            })
 769        })
 770    }
 771
 772    pub fn worktree_root_names<'a>(&'a self, cx: &'a AppContext) -> impl Iterator<Item = &'a str> {
 773        self.visible_worktrees(cx)
 774            .map(|tree| tree.read(cx).root_name())
 775    }
 776
 777    pub fn worktree_for_id(
 778        &self,
 779        id: WorktreeId,
 780        cx: &AppContext,
 781    ) -> Option<ModelHandle<Worktree>> {
 782        self.worktrees(cx)
 783            .find(|worktree| worktree.read(cx).id() == id)
 784    }
 785
 786    pub fn worktree_for_entry(
 787        &self,
 788        entry_id: ProjectEntryId,
 789        cx: &AppContext,
 790    ) -> Option<ModelHandle<Worktree>> {
 791        self.worktrees(cx)
 792            .find(|worktree| worktree.read(cx).contains_entry(entry_id))
 793    }
 794
 795    pub fn worktree_id_for_entry(
 796        &self,
 797        entry_id: ProjectEntryId,
 798        cx: &AppContext,
 799    ) -> Option<WorktreeId> {
 800        self.worktree_for_entry(entry_id, cx)
 801            .map(|worktree| worktree.read(cx).id())
 802    }
 803
 804    pub fn contains_paths(&self, paths: &[PathBuf], cx: &AppContext) -> bool {
 805        paths.iter().all(|path| self.contains_path(path, cx))
 806    }
 807
 808    pub fn contains_path(&self, path: &Path, cx: &AppContext) -> bool {
 809        for worktree in self.worktrees(cx) {
 810            let worktree = worktree.read(cx).as_local();
 811            if worktree.map_or(false, |w| w.contains_abs_path(path)) {
 812                return true;
 813            }
 814        }
 815        false
 816    }
 817
 818    pub fn create_entry(
 819        &mut self,
 820        project_path: impl Into<ProjectPath>,
 821        is_directory: bool,
 822        cx: &mut ModelContext<Self>,
 823    ) -> Option<Task<Result<Entry>>> {
 824        let project_path = project_path.into();
 825        let worktree = self.worktree_for_id(project_path.worktree_id, cx)?;
 826        if self.is_local() {
 827            Some(worktree.update(cx, |worktree, cx| {
 828                worktree
 829                    .as_local_mut()
 830                    .unwrap()
 831                    .create_entry(project_path.path, is_directory, cx)
 832            }))
 833        } else {
 834            let client = self.client.clone();
 835            let project_id = self.remote_id().unwrap();
 836            Some(cx.spawn_weak(|_, mut cx| async move {
 837                let response = client
 838                    .request(proto::CreateProjectEntry {
 839                        worktree_id: project_path.worktree_id.to_proto(),
 840                        project_id,
 841                        path: project_path.path.to_string_lossy().into(),
 842                        is_directory,
 843                    })
 844                    .await?;
 845                let entry = response
 846                    .entry
 847                    .ok_or_else(|| anyhow!("missing entry in response"))?;
 848                worktree
 849                    .update(&mut cx, |worktree, cx| {
 850                        worktree.as_remote_mut().unwrap().insert_entry(
 851                            entry,
 852                            response.worktree_scan_id as usize,
 853                            cx,
 854                        )
 855                    })
 856                    .await
 857            }))
 858        }
 859    }
 860
 861    pub fn copy_entry(
 862        &mut self,
 863        entry_id: ProjectEntryId,
 864        new_path: impl Into<Arc<Path>>,
 865        cx: &mut ModelContext<Self>,
 866    ) -> Option<Task<Result<Entry>>> {
 867        let worktree = self.worktree_for_entry(entry_id, cx)?;
 868        let new_path = new_path.into();
 869        if self.is_local() {
 870            worktree.update(cx, |worktree, cx| {
 871                worktree
 872                    .as_local_mut()
 873                    .unwrap()
 874                    .copy_entry(entry_id, new_path, cx)
 875            })
 876        } else {
 877            let client = self.client.clone();
 878            let project_id = self.remote_id().unwrap();
 879
 880            Some(cx.spawn_weak(|_, mut cx| async move {
 881                let response = client
 882                    .request(proto::CopyProjectEntry {
 883                        project_id,
 884                        entry_id: entry_id.to_proto(),
 885                        new_path: new_path.to_string_lossy().into(),
 886                    })
 887                    .await?;
 888                let entry = response
 889                    .entry
 890                    .ok_or_else(|| anyhow!("missing entry in response"))?;
 891                worktree
 892                    .update(&mut cx, |worktree, cx| {
 893                        worktree.as_remote_mut().unwrap().insert_entry(
 894                            entry,
 895                            response.worktree_scan_id as usize,
 896                            cx,
 897                        )
 898                    })
 899                    .await
 900            }))
 901        }
 902    }
 903
 904    pub fn rename_entry(
 905        &mut self,
 906        entry_id: ProjectEntryId,
 907        new_path: impl Into<Arc<Path>>,
 908        cx: &mut ModelContext<Self>,
 909    ) -> Option<Task<Result<Entry>>> {
 910        let worktree = self.worktree_for_entry(entry_id, cx)?;
 911        let new_path = new_path.into();
 912        if self.is_local() {
 913            worktree.update(cx, |worktree, cx| {
 914                worktree
 915                    .as_local_mut()
 916                    .unwrap()
 917                    .rename_entry(entry_id, new_path, cx)
 918            })
 919        } else {
 920            let client = self.client.clone();
 921            let project_id = self.remote_id().unwrap();
 922
 923            Some(cx.spawn_weak(|_, mut cx| async move {
 924                let response = client
 925                    .request(proto::RenameProjectEntry {
 926                        project_id,
 927                        entry_id: entry_id.to_proto(),
 928                        new_path: new_path.to_string_lossy().into(),
 929                    })
 930                    .await?;
 931                let entry = response
 932                    .entry
 933                    .ok_or_else(|| anyhow!("missing entry in response"))?;
 934                worktree
 935                    .update(&mut cx, |worktree, cx| {
 936                        worktree.as_remote_mut().unwrap().insert_entry(
 937                            entry,
 938                            response.worktree_scan_id as usize,
 939                            cx,
 940                        )
 941                    })
 942                    .await
 943            }))
 944        }
 945    }
 946
 947    pub fn delete_entry(
 948        &mut self,
 949        entry_id: ProjectEntryId,
 950        cx: &mut ModelContext<Self>,
 951    ) -> Option<Task<Result<()>>> {
 952        let worktree = self.worktree_for_entry(entry_id, cx)?;
 953        if self.is_local() {
 954            worktree.update(cx, |worktree, cx| {
 955                worktree.as_local_mut().unwrap().delete_entry(entry_id, cx)
 956            })
 957        } else {
 958            let client = self.client.clone();
 959            let project_id = self.remote_id().unwrap();
 960            Some(cx.spawn_weak(|_, mut cx| async move {
 961                let response = client
 962                    .request(proto::DeleteProjectEntry {
 963                        project_id,
 964                        entry_id: entry_id.to_proto(),
 965                    })
 966                    .await?;
 967                worktree
 968                    .update(&mut cx, move |worktree, cx| {
 969                        worktree.as_remote_mut().unwrap().delete_entry(
 970                            entry_id,
 971                            response.worktree_scan_id as usize,
 972                            cx,
 973                        )
 974                    })
 975                    .await
 976            }))
 977        }
 978    }
 979
 980    pub fn shared(&mut self, project_id: u64, cx: &mut ModelContext<Self>) -> Result<()> {
 981        if self.client_state.is_some() {
 982            return Err(anyhow!("project was already shared"));
 983        }
 984        self.client_subscriptions.push(
 985            self.client
 986                .subscribe_to_entity(project_id)?
 987                .set_model(&cx.handle(), &mut cx.to_async()),
 988        );
 989
 990        for open_buffer in self.opened_buffers.values_mut() {
 991            match open_buffer {
 992                OpenBuffer::Strong(_) => {}
 993                OpenBuffer::Weak(buffer) => {
 994                    if let Some(buffer) = buffer.upgrade(cx) {
 995                        *open_buffer = OpenBuffer::Strong(buffer);
 996                    }
 997                }
 998                OpenBuffer::Operations(_) => unreachable!(),
 999            }
1000        }
1001
1002        for worktree_handle in self.worktrees.iter_mut() {
1003            match worktree_handle {
1004                WorktreeHandle::Strong(_) => {}
1005                WorktreeHandle::Weak(worktree) => {
1006                    if let Some(worktree) = worktree.upgrade(cx) {
1007                        *worktree_handle = WorktreeHandle::Strong(worktree);
1008                    }
1009                }
1010            }
1011        }
1012
1013        for (server_id, status) in &self.language_server_statuses {
1014            self.client
1015                .send(proto::StartLanguageServer {
1016                    project_id,
1017                    server: Some(proto::LanguageServer {
1018                        id: *server_id as u64,
1019                        name: status.name.clone(),
1020                    }),
1021                })
1022                .log_err();
1023        }
1024
1025        let (updates_tx, mut updates_rx) = mpsc::unbounded();
1026        let client = self.client.clone();
1027        self.client_state = Some(ProjectClientState::Local {
1028            remote_id: project_id,
1029            updates_tx,
1030            _send_updates: cx.spawn_weak(move |this, mut cx| async move {
1031                while let Some(update) = updates_rx.next().await {
1032                    let Some(this) = this.upgrade(&cx) else { break };
1033
1034                    match update {
1035                        LocalProjectUpdate::WorktreesChanged => {
1036                            let worktrees = this
1037                                .read_with(&cx, |this, cx| this.worktrees(cx).collect::<Vec<_>>());
1038                            let update_project = this
1039                                .read_with(&cx, |this, cx| {
1040                                    this.client.request(proto::UpdateProject {
1041                                        project_id,
1042                                        worktrees: this.worktree_metadata_protos(cx),
1043                                    })
1044                                })
1045                                .await;
1046                            if update_project.is_ok() {
1047                                for worktree in worktrees {
1048                                    worktree.update(&mut cx, |worktree, cx| {
1049                                        let worktree = worktree.as_local_mut().unwrap();
1050                                        worktree.share(project_id, cx).detach_and_log_err(cx)
1051                                    });
1052                                }
1053                            }
1054                        }
1055                        LocalProjectUpdate::CreateBufferForPeer { peer_id, buffer_id } => {
1056                            let buffer = this.update(&mut cx, |this, _| {
1057                                let buffer = this.opened_buffers.get(&buffer_id).unwrap();
1058                                let shared_buffers =
1059                                    this.shared_buffers.entry(peer_id).or_default();
1060                                if shared_buffers.insert(buffer_id) {
1061                                    if let OpenBuffer::Strong(buffer) = buffer {
1062                                        Some(buffer.clone())
1063                                    } else {
1064                                        None
1065                                    }
1066                                } else {
1067                                    None
1068                                }
1069                            });
1070
1071                            let Some(buffer) = buffer else { continue };
1072                            let operations =
1073                                buffer.read_with(&cx, |b, cx| b.serialize_ops(None, cx));
1074                            let operations = operations.await;
1075                            let state = buffer.read_with(&cx, |buffer, _| buffer.to_proto());
1076
1077                            let initial_state = proto::CreateBufferForPeer {
1078                                project_id,
1079                                peer_id: Some(peer_id),
1080                                variant: Some(proto::create_buffer_for_peer::Variant::State(state)),
1081                            };
1082                            if client.send(initial_state).log_err().is_some() {
1083                                let client = client.clone();
1084                                cx.background()
1085                                    .spawn(async move {
1086                                        let mut chunks = split_operations(operations).peekable();
1087                                        while let Some(chunk) = chunks.next() {
1088                                            let is_last = chunks.peek().is_none();
1089                                            client.send(proto::CreateBufferForPeer {
1090                                                project_id,
1091                                                peer_id: Some(peer_id),
1092                                                variant: Some(
1093                                                    proto::create_buffer_for_peer::Variant::Chunk(
1094                                                        proto::BufferChunk {
1095                                                            buffer_id,
1096                                                            operations: chunk,
1097                                                            is_last,
1098                                                        },
1099                                                    ),
1100                                                ),
1101                                            })?;
1102                                        }
1103                                        anyhow::Ok(())
1104                                    })
1105                                    .await
1106                                    .log_err();
1107                            }
1108                        }
1109                    }
1110                }
1111            }),
1112        });
1113
1114        let _ = self.metadata_changed(cx);
1115        cx.emit(Event::RemoteIdChanged(Some(project_id)));
1116        cx.notify();
1117        Ok(())
1118    }
1119
1120    pub fn reshared(
1121        &mut self,
1122        message: proto::ResharedProject,
1123        cx: &mut ModelContext<Self>,
1124    ) -> Result<()> {
1125        self.shared_buffers.clear();
1126        self.set_collaborators_from_proto(message.collaborators, cx)?;
1127        let _ = self.metadata_changed(cx);
1128        Ok(())
1129    }
1130
1131    pub fn rejoined(
1132        &mut self,
1133        message: proto::RejoinedProject,
1134        message_id: u32,
1135        cx: &mut ModelContext<Self>,
1136    ) -> Result<()> {
1137        self.join_project_response_message_id = message_id;
1138        self.set_worktrees_from_proto(message.worktrees, cx)?;
1139        self.set_collaborators_from_proto(message.collaborators, cx)?;
1140        self.language_server_statuses = message
1141            .language_servers
1142            .into_iter()
1143            .map(|server| {
1144                (
1145                    server.id as usize,
1146                    LanguageServerStatus {
1147                        name: server.name,
1148                        pending_work: Default::default(),
1149                        has_pending_diagnostic_updates: false,
1150                        progress_tokens: Default::default(),
1151                    },
1152                )
1153            })
1154            .collect();
1155        self.buffer_changes_tx
1156            .unbounded_send(BufferMessage::Resync)
1157            .unwrap();
1158        cx.notify();
1159        Ok(())
1160    }
1161
1162    pub fn unshare(&mut self, cx: &mut ModelContext<Self>) -> Result<()> {
1163        if self.is_remote() {
1164            return Err(anyhow!("attempted to unshare a remote project"));
1165        }
1166
1167        if let Some(ProjectClientState::Local { remote_id, .. }) = self.client_state.take() {
1168            self.collaborators.clear();
1169            self.shared_buffers.clear();
1170            self.client_subscriptions.clear();
1171
1172            for worktree_handle in self.worktrees.iter_mut() {
1173                if let WorktreeHandle::Strong(worktree) = worktree_handle {
1174                    let is_visible = worktree.update(cx, |worktree, _| {
1175                        worktree.as_local_mut().unwrap().unshare();
1176                        worktree.is_visible()
1177                    });
1178                    if !is_visible {
1179                        *worktree_handle = WorktreeHandle::Weak(worktree.downgrade());
1180                    }
1181                }
1182            }
1183
1184            for open_buffer in self.opened_buffers.values_mut() {
1185                // Wake up any tasks waiting for peers' edits to this buffer.
1186                if let Some(buffer) = open_buffer.upgrade(cx) {
1187                    buffer.update(cx, |buffer, _| buffer.give_up_waiting());
1188                }
1189
1190                if let OpenBuffer::Strong(buffer) = open_buffer {
1191                    *open_buffer = OpenBuffer::Weak(buffer.downgrade());
1192                }
1193            }
1194
1195            let _ = self.metadata_changed(cx);
1196            cx.notify();
1197            self.client.send(proto::UnshareProject {
1198                project_id: remote_id,
1199            })?;
1200
1201            Ok(())
1202        } else {
1203            Err(anyhow!("attempted to unshare an unshared project"))
1204        }
1205    }
1206
1207    pub fn disconnected_from_host(&mut self, cx: &mut ModelContext<Self>) {
1208        if let Some(ProjectClientState::Remote {
1209            sharing_has_stopped,
1210            ..
1211        }) = &mut self.client_state
1212        {
1213            *sharing_has_stopped = true;
1214            self.collaborators.clear();
1215            for worktree in &self.worktrees {
1216                if let Some(worktree) = worktree.upgrade(cx) {
1217                    worktree.update(cx, |worktree, _| {
1218                        if let Some(worktree) = worktree.as_remote_mut() {
1219                            worktree.disconnected_from_host();
1220                        }
1221                    });
1222                }
1223            }
1224            cx.emit(Event::DisconnectedFromHost);
1225            cx.notify();
1226
1227            // Wake up all futures currently waiting on a buffer to get opened,
1228            // to give them a chance to fail now that we've disconnected.
1229            *self.opened_buffer.0.borrow_mut() = ();
1230        }
1231    }
1232
1233    pub fn close(&mut self, cx: &mut ModelContext<Self>) {
1234        cx.emit(Event::Closed);
1235    }
1236
1237    pub fn is_read_only(&self) -> bool {
1238        match &self.client_state {
1239            Some(ProjectClientState::Remote {
1240                sharing_has_stopped,
1241                ..
1242            }) => *sharing_has_stopped,
1243            _ => false,
1244        }
1245    }
1246
1247    pub fn is_local(&self) -> bool {
1248        match &self.client_state {
1249            Some(ProjectClientState::Remote { .. }) => false,
1250            _ => true,
1251        }
1252    }
1253
1254    pub fn is_remote(&self) -> bool {
1255        !self.is_local()
1256    }
1257
1258    pub fn create_buffer(
1259        &mut self,
1260        text: &str,
1261        language: Option<Arc<Language>>,
1262        cx: &mut ModelContext<Self>,
1263    ) -> Result<ModelHandle<Buffer>> {
1264        if self.is_remote() {
1265            return Err(anyhow!("creating buffers as a guest is not supported yet"));
1266        }
1267
1268        let buffer = cx.add_model(|cx| {
1269            Buffer::new(self.replica_id(), text, cx)
1270                .with_language(language.unwrap_or_else(|| language::PLAIN_TEXT.clone()), cx)
1271        });
1272        self.register_buffer(&buffer, cx)?;
1273        Ok(buffer)
1274    }
1275
1276    pub fn open_path(
1277        &mut self,
1278        path: impl Into<ProjectPath>,
1279        cx: &mut ModelContext<Self>,
1280    ) -> Task<Result<(ProjectEntryId, AnyModelHandle)>> {
1281        let task = self.open_buffer(path, cx);
1282        cx.spawn_weak(|_, cx| async move {
1283            let buffer = task.await?;
1284            let project_entry_id = buffer
1285                .read_with(&cx, |buffer, cx| {
1286                    File::from_dyn(buffer.file()).and_then(|file| file.project_entry_id(cx))
1287                })
1288                .ok_or_else(|| anyhow!("no project entry"))?;
1289
1290            let buffer: &AnyModelHandle = &buffer;
1291            Ok((project_entry_id, buffer.clone()))
1292        })
1293    }
1294
1295    pub fn open_local_buffer(
1296        &mut self,
1297        abs_path: impl AsRef<Path>,
1298        cx: &mut ModelContext<Self>,
1299    ) -> Task<Result<ModelHandle<Buffer>>> {
1300        if let Some((worktree, relative_path)) = self.find_local_worktree(abs_path.as_ref(), cx) {
1301            self.open_buffer((worktree.read(cx).id(), relative_path), cx)
1302        } else {
1303            Task::ready(Err(anyhow!("no such path")))
1304        }
1305    }
1306
1307    pub fn open_buffer(
1308        &mut self,
1309        path: impl Into<ProjectPath>,
1310        cx: &mut ModelContext<Self>,
1311    ) -> Task<Result<ModelHandle<Buffer>>> {
1312        let project_path = path.into();
1313        let worktree = if let Some(worktree) = self.worktree_for_id(project_path.worktree_id, cx) {
1314            worktree
1315        } else {
1316            return Task::ready(Err(anyhow!("no such worktree")));
1317        };
1318
1319        // If there is already a buffer for the given path, then return it.
1320        let existing_buffer = self.get_open_buffer(&project_path, cx);
1321        if let Some(existing_buffer) = existing_buffer {
1322            return Task::ready(Ok(existing_buffer));
1323        }
1324
1325        let mut loading_watch = match self.loading_buffers_by_path.entry(project_path.clone()) {
1326            // If the given path is already being loaded, then wait for that existing
1327            // task to complete and return the same buffer.
1328            hash_map::Entry::Occupied(e) => e.get().clone(),
1329
1330            // Otherwise, record the fact that this path is now being loaded.
1331            hash_map::Entry::Vacant(entry) => {
1332                let (mut tx, rx) = postage::watch::channel();
1333                entry.insert(rx.clone());
1334
1335                let load_buffer = if worktree.read(cx).is_local() {
1336                    self.open_local_buffer_internal(&project_path.path, &worktree, cx)
1337                } else {
1338                    self.open_remote_buffer_internal(&project_path.path, &worktree, cx)
1339                };
1340
1341                cx.spawn(move |this, mut cx| async move {
1342                    let load_result = load_buffer.await;
1343                    *tx.borrow_mut() = Some(this.update(&mut cx, |this, _| {
1344                        // Record the fact that the buffer is no longer loading.
1345                        this.loading_buffers_by_path.remove(&project_path);
1346                        let buffer = load_result.map_err(Arc::new)?;
1347                        Ok(buffer)
1348                    }));
1349                })
1350                .detach();
1351                rx
1352            }
1353        };
1354
1355        cx.foreground().spawn(async move {
1356            loop {
1357                if let Some(result) = loading_watch.borrow().as_ref() {
1358                    match result {
1359                        Ok(buffer) => return Ok(buffer.clone()),
1360                        Err(error) => return Err(anyhow!("{}", error)),
1361                    }
1362                }
1363                loading_watch.next().await;
1364            }
1365        })
1366    }
1367
1368    fn open_local_buffer_internal(
1369        &mut self,
1370        path: &Arc<Path>,
1371        worktree: &ModelHandle<Worktree>,
1372        cx: &mut ModelContext<Self>,
1373    ) -> Task<Result<ModelHandle<Buffer>>> {
1374        let load_buffer = worktree.update(cx, |worktree, cx| {
1375            let worktree = worktree.as_local_mut().unwrap();
1376            worktree.load_buffer(path, cx)
1377        });
1378        cx.spawn(|this, mut cx| async move {
1379            let buffer = load_buffer.await?;
1380            this.update(&mut cx, |this, cx| this.register_buffer(&buffer, cx))?;
1381            Ok(buffer)
1382        })
1383    }
1384
1385    fn open_remote_buffer_internal(
1386        &mut self,
1387        path: &Arc<Path>,
1388        worktree: &ModelHandle<Worktree>,
1389        cx: &mut ModelContext<Self>,
1390    ) -> Task<Result<ModelHandle<Buffer>>> {
1391        let rpc = self.client.clone();
1392        let project_id = self.remote_id().unwrap();
1393        let remote_worktree_id = worktree.read(cx).id();
1394        let path = path.clone();
1395        let path_string = path.to_string_lossy().to_string();
1396        cx.spawn(|this, mut cx| async move {
1397            let response = rpc
1398                .request(proto::OpenBufferByPath {
1399                    project_id,
1400                    worktree_id: remote_worktree_id.to_proto(),
1401                    path: path_string,
1402                })
1403                .await?;
1404            this.update(&mut cx, |this, cx| {
1405                this.wait_for_remote_buffer(response.buffer_id, cx)
1406            })
1407            .await
1408        })
1409    }
1410
1411    /// LanguageServerName is owned, because it is inserted into a map
1412    fn open_local_buffer_via_lsp(
1413        &mut self,
1414        abs_path: lsp::Url,
1415        language_server_id: usize,
1416        language_server_name: LanguageServerName,
1417        cx: &mut ModelContext<Self>,
1418    ) -> Task<Result<ModelHandle<Buffer>>> {
1419        cx.spawn(|this, mut cx| async move {
1420            let abs_path = abs_path
1421                .to_file_path()
1422                .map_err(|_| anyhow!("can't convert URI to path"))?;
1423            let (worktree, relative_path) = if let Some(result) =
1424                this.read_with(&cx, |this, cx| this.find_local_worktree(&abs_path, cx))
1425            {
1426                result
1427            } else {
1428                let worktree = this
1429                    .update(&mut cx, |this, cx| {
1430                        this.create_local_worktree(&abs_path, false, cx)
1431                    })
1432                    .await?;
1433                this.update(&mut cx, |this, cx| {
1434                    this.language_server_ids.insert(
1435                        (worktree.read(cx).id(), language_server_name),
1436                        language_server_id,
1437                    );
1438                });
1439                (worktree, PathBuf::new())
1440            };
1441
1442            let project_path = ProjectPath {
1443                worktree_id: worktree.read_with(&cx, |worktree, _| worktree.id()),
1444                path: relative_path.into(),
1445            };
1446            this.update(&mut cx, |this, cx| this.open_buffer(project_path, cx))
1447                .await
1448        })
1449    }
1450
1451    pub fn open_buffer_by_id(
1452        &mut self,
1453        id: u64,
1454        cx: &mut ModelContext<Self>,
1455    ) -> Task<Result<ModelHandle<Buffer>>> {
1456        if let Some(buffer) = self.buffer_for_id(id, cx) {
1457            Task::ready(Ok(buffer))
1458        } else if self.is_local() {
1459            Task::ready(Err(anyhow!("buffer {} does not exist", id)))
1460        } else if let Some(project_id) = self.remote_id() {
1461            let request = self
1462                .client
1463                .request(proto::OpenBufferById { project_id, id });
1464            cx.spawn(|this, mut cx| async move {
1465                let buffer_id = request.await?.buffer_id;
1466                this.update(&mut cx, |this, cx| {
1467                    this.wait_for_remote_buffer(buffer_id, cx)
1468                })
1469                .await
1470            })
1471        } else {
1472            Task::ready(Err(anyhow!("cannot open buffer while disconnected")))
1473        }
1474    }
1475
1476    pub fn save_buffers(
1477        &self,
1478        buffers: HashSet<ModelHandle<Buffer>>,
1479        cx: &mut ModelContext<Self>,
1480    ) -> Task<Result<()>> {
1481        cx.spawn(|this, mut cx| async move {
1482            let save_tasks = buffers
1483                .into_iter()
1484                .map(|buffer| this.update(&mut cx, |this, cx| this.save_buffer(buffer, cx)));
1485            try_join_all(save_tasks).await?;
1486            Ok(())
1487        })
1488    }
1489
1490    pub fn save_buffer(
1491        &self,
1492        buffer: ModelHandle<Buffer>,
1493        cx: &mut ModelContext<Self>,
1494    ) -> Task<Result<(clock::Global, RopeFingerprint, SystemTime)>> {
1495        let Some(file) = File::from_dyn(buffer.read(cx).file()) else {
1496            return Task::ready(Err(anyhow!("buffer doesn't have a file")));
1497        };
1498        let worktree = file.worktree.clone();
1499        let path = file.path.clone();
1500        worktree.update(cx, |worktree, cx| match worktree {
1501            Worktree::Local(worktree) => worktree.save_buffer(buffer, path, false, cx),
1502            Worktree::Remote(worktree) => worktree.save_buffer(buffer, cx),
1503        })
1504    }
1505
1506    pub fn save_buffer_as(
1507        &mut self,
1508        buffer: ModelHandle<Buffer>,
1509        abs_path: PathBuf,
1510        cx: &mut ModelContext<Self>,
1511    ) -> Task<Result<()>> {
1512        let worktree_task = self.find_or_create_local_worktree(&abs_path, true, cx);
1513        let old_path =
1514            File::from_dyn(buffer.read(cx).file()).and_then(|f| Some(f.as_local()?.abs_path(cx)));
1515        cx.spawn(|this, mut cx| async move {
1516            if let Some(old_path) = old_path {
1517                this.update(&mut cx, |this, cx| {
1518                    this.unregister_buffer_from_language_server(&buffer, old_path, cx);
1519                });
1520            }
1521            let (worktree, path) = worktree_task.await?;
1522            worktree
1523                .update(&mut cx, |worktree, cx| match worktree {
1524                    Worktree::Local(worktree) => {
1525                        worktree.save_buffer(buffer.clone(), path.into(), true, cx)
1526                    }
1527                    Worktree::Remote(_) => panic!("cannot remote buffers as new files"),
1528                })
1529                .await?;
1530            this.update(&mut cx, |this, cx| {
1531                this.detect_language_for_buffer(&buffer, cx);
1532                this.register_buffer_with_language_server(&buffer, cx);
1533            });
1534            Ok(())
1535        })
1536    }
1537
1538    pub fn get_open_buffer(
1539        &mut self,
1540        path: &ProjectPath,
1541        cx: &mut ModelContext<Self>,
1542    ) -> Option<ModelHandle<Buffer>> {
1543        let worktree = self.worktree_for_id(path.worktree_id, cx)?;
1544        self.opened_buffers.values().find_map(|buffer| {
1545            let buffer = buffer.upgrade(cx)?;
1546            let file = File::from_dyn(buffer.read(cx).file())?;
1547            if file.worktree == worktree && file.path() == &path.path {
1548                Some(buffer)
1549            } else {
1550                None
1551            }
1552        })
1553    }
1554
1555    fn register_buffer(
1556        &mut self,
1557        buffer: &ModelHandle<Buffer>,
1558        cx: &mut ModelContext<Self>,
1559    ) -> Result<()> {
1560        buffer.update(cx, |buffer, _| {
1561            buffer.set_language_registry(self.languages.clone())
1562        });
1563
1564        let remote_id = buffer.read(cx).remote_id();
1565        let is_remote = self.is_remote();
1566        let open_buffer = if is_remote || self.is_shared() {
1567            OpenBuffer::Strong(buffer.clone())
1568        } else {
1569            OpenBuffer::Weak(buffer.downgrade())
1570        };
1571
1572        match self.opened_buffers.entry(remote_id) {
1573            hash_map::Entry::Vacant(entry) => {
1574                entry.insert(open_buffer);
1575            }
1576            hash_map::Entry::Occupied(mut entry) => {
1577                if let OpenBuffer::Operations(operations) = entry.get_mut() {
1578                    buffer.update(cx, |b, cx| b.apply_ops(operations.drain(..), cx))?;
1579                } else if entry.get().upgrade(cx).is_some() {
1580                    if is_remote {
1581                        return Ok(());
1582                    } else {
1583                        debug_panic!("buffer {} was already registered", remote_id);
1584                        Err(anyhow!("buffer {} was already registered", remote_id))?;
1585                    }
1586                }
1587                entry.insert(open_buffer);
1588            }
1589        }
1590        cx.subscribe(buffer, |this, buffer, event, cx| {
1591            this.on_buffer_event(buffer, event, cx);
1592        })
1593        .detach();
1594
1595        self.detect_language_for_buffer(buffer, cx);
1596        self.register_buffer_with_language_server(buffer, cx);
1597        cx.observe_release(buffer, |this, buffer, cx| {
1598            if let Some(file) = File::from_dyn(buffer.file()) {
1599                if file.is_local() {
1600                    let uri = lsp::Url::from_file_path(file.abs_path(cx)).unwrap();
1601                    if let Some((_, server)) = this.language_server_for_buffer(buffer, cx) {
1602                        server
1603                            .notify::<lsp::notification::DidCloseTextDocument>(
1604                                lsp::DidCloseTextDocumentParams {
1605                                    text_document: lsp::TextDocumentIdentifier::new(uri),
1606                                },
1607                            )
1608                            .log_err();
1609                    }
1610                }
1611            }
1612        })
1613        .detach();
1614
1615        *self.opened_buffer.0.borrow_mut() = ();
1616        Ok(())
1617    }
1618
1619    fn register_buffer_with_language_server(
1620        &mut self,
1621        buffer_handle: &ModelHandle<Buffer>,
1622        cx: &mut ModelContext<Self>,
1623    ) {
1624        let buffer = buffer_handle.read(cx);
1625        let buffer_id = buffer.remote_id();
1626        if let Some(file) = File::from_dyn(buffer.file()) {
1627            if file.is_local() {
1628                let uri = lsp::Url::from_file_path(file.abs_path(cx)).unwrap();
1629                let initial_snapshot = buffer.text_snapshot();
1630
1631                let mut language_server = None;
1632                let mut language_id = None;
1633                if let Some(language) = buffer.language() {
1634                    let worktree_id = file.worktree_id(cx);
1635                    if let Some(adapter) = language.lsp_adapter() {
1636                        language_id = adapter.language_ids.get(language.name().as_ref()).cloned();
1637                        language_server = self
1638                            .language_server_ids
1639                            .get(&(worktree_id, adapter.name.clone()))
1640                            .and_then(|id| self.language_servers.get(id))
1641                            .and_then(|server_state| {
1642                                if let LanguageServerState::Running { server, .. } = server_state {
1643                                    Some(server.clone())
1644                                } else {
1645                                    None
1646                                }
1647                            });
1648                    }
1649                }
1650
1651                if let Some(local_worktree) = file.worktree.read(cx).as_local() {
1652                    if let Some(diagnostics) = local_worktree.diagnostics_for_path(file.path()) {
1653                        self.update_buffer_diagnostics(buffer_handle, diagnostics, None, cx)
1654                            .log_err();
1655                    }
1656                }
1657
1658                if let Some(server) = language_server {
1659                    server
1660                        .notify::<lsp::notification::DidOpenTextDocument>(
1661                            lsp::DidOpenTextDocumentParams {
1662                                text_document: lsp::TextDocumentItem::new(
1663                                    uri,
1664                                    language_id.unwrap_or_default(),
1665                                    0,
1666                                    initial_snapshot.text(),
1667                                ),
1668                            },
1669                        )
1670                        .log_err();
1671                    buffer_handle.update(cx, |buffer, cx| {
1672                        buffer.set_completion_triggers(
1673                            server
1674                                .capabilities()
1675                                .completion_provider
1676                                .as_ref()
1677                                .and_then(|provider| provider.trigger_characters.clone())
1678                                .unwrap_or_default(),
1679                            cx,
1680                        )
1681                    });
1682                    self.buffer_snapshots
1683                        .insert(buffer_id, vec![(0, initial_snapshot)]);
1684                }
1685            }
1686        }
1687    }
1688
1689    fn unregister_buffer_from_language_server(
1690        &mut self,
1691        buffer: &ModelHandle<Buffer>,
1692        old_path: PathBuf,
1693        cx: &mut ModelContext<Self>,
1694    ) {
1695        buffer.update(cx, |buffer, cx| {
1696            buffer.update_diagnostics(Default::default(), cx);
1697            self.buffer_snapshots.remove(&buffer.remote_id());
1698            if let Some((_, language_server)) = self.language_server_for_buffer(buffer, cx) {
1699                language_server
1700                    .notify::<lsp::notification::DidCloseTextDocument>(
1701                        lsp::DidCloseTextDocumentParams {
1702                            text_document: lsp::TextDocumentIdentifier::new(
1703                                lsp::Url::from_file_path(old_path).unwrap(),
1704                            ),
1705                        },
1706                    )
1707                    .log_err();
1708            }
1709        });
1710    }
1711
1712    async fn send_buffer_messages(
1713        this: WeakModelHandle<Self>,
1714        mut rx: UnboundedReceiver<BufferMessage>,
1715        mut cx: AsyncAppContext,
1716    ) {
1717        let mut needs_resync_with_host = false;
1718        while let Some(change) = rx.next().await {
1719            if let Some(this) = this.upgrade(&mut cx) {
1720                let is_local = this.read_with(&cx, |this, _| this.is_local());
1721                match change {
1722                    BufferMessage::Operation {
1723                        buffer_id,
1724                        operation,
1725                    } => {
1726                        if needs_resync_with_host {
1727                            continue;
1728                        }
1729                        let request = this.read_with(&cx, |this, _| {
1730                            let project_id = this.remote_id()?;
1731                            Some(this.client.request(proto::UpdateBuffer {
1732                                buffer_id,
1733                                project_id,
1734                                operations: vec![operation],
1735                            }))
1736                        });
1737                        if let Some(request) = request {
1738                            if request.await.is_err() && !is_local {
1739                                needs_resync_with_host = true;
1740                            }
1741                        }
1742                    }
1743                    BufferMessage::Resync => {
1744                        if this
1745                            .update(&mut cx, |this, cx| this.synchronize_remote_buffers(cx))
1746                            .await
1747                            .is_ok()
1748                        {
1749                            needs_resync_with_host = false;
1750                        }
1751                    }
1752                }
1753            } else {
1754                break;
1755            }
1756        }
1757    }
1758
1759    fn on_buffer_event(
1760        &mut self,
1761        buffer: ModelHandle<Buffer>,
1762        event: &BufferEvent,
1763        cx: &mut ModelContext<Self>,
1764    ) -> Option<()> {
1765        match event {
1766            BufferEvent::Operation(operation) => {
1767                self.buffer_changes_tx
1768                    .unbounded_send(BufferMessage::Operation {
1769                        buffer_id: buffer.read(cx).remote_id(),
1770                        operation: language::proto::serialize_operation(operation),
1771                    })
1772                    .ok();
1773            }
1774            BufferEvent::Edited { .. } => {
1775                let language_server = self
1776                    .language_server_for_buffer(buffer.read(cx), cx)
1777                    .map(|(_, server)| server.clone())?;
1778                let buffer = buffer.read(cx);
1779                let file = File::from_dyn(buffer.file())?;
1780                let abs_path = file.as_local()?.abs_path(cx);
1781                let uri = lsp::Url::from_file_path(abs_path).unwrap();
1782                let buffer_snapshots = self.buffer_snapshots.get_mut(&buffer.remote_id())?;
1783                let (version, prev_snapshot) = buffer_snapshots.last()?;
1784                let next_snapshot = buffer.text_snapshot();
1785                let next_version = version + 1;
1786
1787                let content_changes = buffer
1788                    .edits_since::<(PointUtf16, usize)>(prev_snapshot.version())
1789                    .map(|edit| {
1790                        let edit_start = edit.new.start.0;
1791                        let edit_end = edit_start + (edit.old.end.0 - edit.old.start.0);
1792                        let new_text = next_snapshot
1793                            .text_for_range(edit.new.start.1..edit.new.end.1)
1794                            .collect();
1795                        lsp::TextDocumentContentChangeEvent {
1796                            range: Some(lsp::Range::new(
1797                                point_to_lsp(edit_start),
1798                                point_to_lsp(edit_end),
1799                            )),
1800                            range_length: None,
1801                            text: new_text,
1802                        }
1803                    })
1804                    .collect();
1805
1806                buffer_snapshots.push((next_version, next_snapshot));
1807
1808                language_server
1809                    .notify::<lsp::notification::DidChangeTextDocument>(
1810                        lsp::DidChangeTextDocumentParams {
1811                            text_document: lsp::VersionedTextDocumentIdentifier::new(
1812                                uri,
1813                                next_version,
1814                            ),
1815                            content_changes,
1816                        },
1817                    )
1818                    .log_err();
1819            }
1820            BufferEvent::Saved => {
1821                let file = File::from_dyn(buffer.read(cx).file())?;
1822                let worktree_id = file.worktree_id(cx);
1823                let abs_path = file.as_local()?.abs_path(cx);
1824                let text_document = lsp::TextDocumentIdentifier {
1825                    uri: lsp::Url::from_file_path(abs_path).unwrap(),
1826                };
1827
1828                for (_, _, server) in self.language_servers_for_worktree(worktree_id) {
1829                    server
1830                        .notify::<lsp::notification::DidSaveTextDocument>(
1831                            lsp::DidSaveTextDocumentParams {
1832                                text_document: text_document.clone(),
1833                                text: None,
1834                            },
1835                        )
1836                        .log_err();
1837                }
1838
1839                let language_server_id = self.language_server_id_for_buffer(buffer.read(cx), cx)?;
1840                if let Some(LanguageServerState::Running {
1841                    adapter,
1842                    simulate_disk_based_diagnostics_completion,
1843                    ..
1844                }) = self.language_servers.get_mut(&language_server_id)
1845                {
1846                    // After saving a buffer using a language server that doesn't provide
1847                    // a disk-based progress token, kick off a timer that will reset every
1848                    // time the buffer is saved. If the timer eventually fires, simulate
1849                    // disk-based diagnostics being finished so that other pieces of UI
1850                    // (e.g., project diagnostics view, diagnostic status bar) can update.
1851                    // We don't emit an event right away because the language server might take
1852                    // some time to publish diagnostics.
1853                    if adapter.disk_based_diagnostics_progress_token.is_none() {
1854                        const DISK_BASED_DIAGNOSTICS_DEBOUNCE: Duration = Duration::from_secs(1);
1855
1856                        let task = cx.spawn_weak(|this, mut cx| async move {
1857                            cx.background().timer(DISK_BASED_DIAGNOSTICS_DEBOUNCE).await;
1858                            if let Some(this) = this.upgrade(&cx) {
1859                                this.update(&mut cx, |this, cx | {
1860                                    this.disk_based_diagnostics_finished(language_server_id, cx);
1861                                    this.broadcast_language_server_update(
1862                                        language_server_id,
1863                                        proto::update_language_server::Variant::DiskBasedDiagnosticsUpdated(
1864                                            proto::LspDiskBasedDiagnosticsUpdated {},
1865                                        ),
1866                                    );
1867                                });
1868                            }
1869                        });
1870                        *simulate_disk_based_diagnostics_completion = Some(task);
1871                    }
1872                }
1873            }
1874            _ => {}
1875        }
1876
1877        None
1878    }
1879
1880    fn language_servers_for_worktree(
1881        &self,
1882        worktree_id: WorktreeId,
1883    ) -> impl Iterator<Item = (&Arc<CachedLspAdapter>, &Arc<Language>, &Arc<LanguageServer>)> {
1884        self.language_server_ids
1885            .iter()
1886            .filter_map(move |((language_server_worktree_id, _), id)| {
1887                if *language_server_worktree_id == worktree_id {
1888                    if let Some(LanguageServerState::Running {
1889                        adapter,
1890                        language,
1891                        server,
1892                        ..
1893                    }) = self.language_servers.get(id)
1894                    {
1895                        return Some((adapter, language, server));
1896                    }
1897                }
1898                None
1899            })
1900    }
1901
1902    fn maintain_buffer_languages(
1903        languages: &LanguageRegistry,
1904        cx: &mut ModelContext<Project>,
1905    ) -> Task<()> {
1906        let mut subscription = languages.subscribe();
1907        cx.spawn_weak(|project, mut cx| async move {
1908            while let Some(()) = subscription.next().await {
1909                if let Some(project) = project.upgrade(&cx) {
1910                    project.update(&mut cx, |project, cx| {
1911                        let mut plain_text_buffers = Vec::new();
1912                        let mut buffers_with_unknown_injections = Vec::new();
1913                        for buffer in project.opened_buffers.values() {
1914                            if let Some(handle) = buffer.upgrade(cx) {
1915                                let buffer = &handle.read(cx);
1916                                if buffer.language().is_none()
1917                                    || buffer.language() == Some(&*language::PLAIN_TEXT)
1918                                {
1919                                    plain_text_buffers.push(handle);
1920                                } else if buffer.contains_unknown_injections() {
1921                                    buffers_with_unknown_injections.push(handle);
1922                                }
1923                            }
1924                        }
1925
1926                        for buffer in plain_text_buffers {
1927                            project.detect_language_for_buffer(&buffer, cx);
1928                            project.register_buffer_with_language_server(&buffer, cx);
1929                        }
1930
1931                        for buffer in buffers_with_unknown_injections {
1932                            buffer.update(cx, |buffer, cx| buffer.reparse(cx));
1933                        }
1934                    });
1935                }
1936            }
1937        })
1938    }
1939
1940    fn maintain_workspace_config(
1941        languages: Arc<LanguageRegistry>,
1942        cx: &mut ModelContext<Project>,
1943    ) -> Task<()> {
1944        let (mut settings_changed_tx, mut settings_changed_rx) = watch::channel();
1945        let _ = postage::stream::Stream::try_recv(&mut settings_changed_rx);
1946
1947        let settings_observation = cx.observe_global::<Settings, _>(move |_, _| {
1948            *settings_changed_tx.borrow_mut() = ();
1949        });
1950        cx.spawn_weak(|this, mut cx| async move {
1951            while let Some(_) = settings_changed_rx.next().await {
1952                let workspace_config = cx.update(|cx| languages.workspace_configuration(cx)).await;
1953                if let Some(this) = this.upgrade(&cx) {
1954                    this.read_with(&cx, |this, _| {
1955                        for server_state in this.language_servers.values() {
1956                            if let LanguageServerState::Running { server, .. } = server_state {
1957                                server
1958                                    .notify::<lsp::notification::DidChangeConfiguration>(
1959                                        lsp::DidChangeConfigurationParams {
1960                                            settings: workspace_config.clone(),
1961                                        },
1962                                    )
1963                                    .ok();
1964                            }
1965                        }
1966                    })
1967                } else {
1968                    break;
1969                }
1970            }
1971
1972            drop(settings_observation);
1973        })
1974    }
1975
1976    fn detect_language_for_buffer(
1977        &mut self,
1978        buffer: &ModelHandle<Buffer>,
1979        cx: &mut ModelContext<Self>,
1980    ) -> Option<()> {
1981        // If the buffer has a language, set it and start the language server if we haven't already.
1982        let full_path = buffer.read(cx).file()?.full_path(cx);
1983        let new_language = self
1984            .languages
1985            .language_for_path(&full_path)
1986            .now_or_never()?
1987            .ok()?;
1988        self.set_language_for_buffer(buffer, new_language, cx);
1989        None
1990    }
1991
1992    pub fn set_language_for_buffer(
1993        &mut self,
1994        buffer: &ModelHandle<Buffer>,
1995        new_language: Arc<Language>,
1996        cx: &mut ModelContext<Self>,
1997    ) {
1998        buffer.update(cx, |buffer, cx| {
1999            if buffer.language().map_or(true, |old_language| {
2000                !Arc::ptr_eq(old_language, &new_language)
2001            }) {
2002                buffer.set_language(Some(new_language.clone()), cx);
2003            }
2004        });
2005
2006        if let Some(file) = File::from_dyn(buffer.read(cx).file()) {
2007            if let Some(worktree) = file.worktree.read(cx).as_local() {
2008                let worktree_id = worktree.id();
2009                let worktree_abs_path = worktree.abs_path().clone();
2010                self.start_language_server(worktree_id, worktree_abs_path, new_language, cx);
2011            }
2012        }
2013    }
2014
2015    fn start_language_server(
2016        &mut self,
2017        worktree_id: WorktreeId,
2018        worktree_path: Arc<Path>,
2019        language: Arc<Language>,
2020        cx: &mut ModelContext<Self>,
2021    ) {
2022        if !cx
2023            .global::<Settings>()
2024            .enable_language_server(Some(&language.name()))
2025        {
2026            return;
2027        }
2028
2029        let adapter = if let Some(adapter) = language.lsp_adapter() {
2030            adapter
2031        } else {
2032            return;
2033        };
2034        let key = (worktree_id, adapter.name.clone());
2035
2036        let mut initialization_options = adapter.initialization_options.clone();
2037
2038        let lsp = &cx.global::<Settings>().lsp.get(&adapter.name.0);
2039        let override_options = lsp.map(|s| s.initialization_options.clone()).flatten();
2040        match (&mut initialization_options, override_options) {
2041            (Some(initialization_options), Some(override_options)) => {
2042                merge_json_value_into(override_options, initialization_options);
2043            }
2044            (None, override_options) => initialization_options = override_options,
2045            _ => {}
2046        }
2047
2048        self.language_server_ids
2049            .entry(key.clone())
2050            .or_insert_with(|| {
2051                let languages = self.languages.clone();
2052                let server_id = post_inc(&mut self.next_language_server_id);
2053                let language_server = self.languages.start_language_server(
2054                    server_id,
2055                    language.clone(),
2056                    worktree_path,
2057                    self.client.http_client(),
2058                    cx,
2059                );
2060                self.language_servers.insert(
2061                    server_id,
2062                    LanguageServerState::Starting(cx.spawn_weak(|this, mut cx| async move {
2063                        let workspace_config =
2064                            cx.update(|cx| languages.workspace_configuration(cx)).await;
2065                        let language_server = language_server?.await.log_err()?;
2066                        let language_server = language_server
2067                            .initialize(initialization_options)
2068                            .await
2069                            .log_err()?;
2070                        let this = this.upgrade(&cx)?;
2071
2072                        language_server
2073                            .on_notification::<lsp::notification::PublishDiagnostics, _>({
2074                                let this = this.downgrade();
2075                                let adapter = adapter.clone();
2076                                move |mut params, cx| {
2077                                    let this = this;
2078                                    let adapter = adapter.clone();
2079                                    cx.spawn(|mut cx| async move {
2080                                        adapter.process_diagnostics(&mut params).await;
2081                                        if let Some(this) = this.upgrade(&cx) {
2082                                            this.update(&mut cx, |this, cx| {
2083                                                this.update_diagnostics(
2084                                                    server_id,
2085                                                    params,
2086                                                    &adapter.disk_based_diagnostic_sources,
2087                                                    cx,
2088                                                )
2089                                                .log_err();
2090                                            });
2091                                        }
2092                                    })
2093                                    .detach();
2094                                }
2095                            })
2096                            .detach();
2097
2098                        language_server
2099                            .on_request::<lsp::request::WorkspaceConfiguration, _, _>({
2100                                let languages = languages.clone();
2101                                move |params, mut cx| {
2102                                    let languages = languages.clone();
2103                                    async move {
2104                                        let workspace_config = cx
2105                                            .update(|cx| languages.workspace_configuration(cx))
2106                                            .await;
2107                                        Ok(params
2108                                            .items
2109                                            .into_iter()
2110                                            .map(|item| {
2111                                                if let Some(section) = &item.section {
2112                                                    workspace_config
2113                                                        .get(section)
2114                                                        .cloned()
2115                                                        .unwrap_or(serde_json::Value::Null)
2116                                                } else {
2117                                                    workspace_config.clone()
2118                                                }
2119                                            })
2120                                            .collect())
2121                                    }
2122                                }
2123                            })
2124                            .detach();
2125
2126                        // Even though we don't have handling for these requests, respond to them to
2127                        // avoid stalling any language server like `gopls` which waits for a response
2128                        // to these requests when initializing.
2129                        language_server
2130                            .on_request::<lsp::request::WorkDoneProgressCreate, _, _>({
2131                                let this = this.downgrade();
2132                                move |params, mut cx| async move {
2133                                    if let Some(this) = this.upgrade(&cx) {
2134                                        this.update(&mut cx, |this, _| {
2135                                            if let Some(status) =
2136                                                this.language_server_statuses.get_mut(&server_id)
2137                                            {
2138                                                if let lsp::NumberOrString::String(token) =
2139                                                    params.token
2140                                                {
2141                                                    status.progress_tokens.insert(token);
2142                                                }
2143                                            }
2144                                        });
2145                                    }
2146                                    Ok(())
2147                                }
2148                            })
2149                            .detach();
2150                        language_server
2151                            .on_request::<lsp::request::RegisterCapability, _, _>({
2152                                let this = this.downgrade();
2153                                move |params, mut cx| async move {
2154                                    let this = this
2155                                        .upgrade(&cx)
2156                                        .ok_or_else(|| anyhow!("project dropped"))?;
2157                                    for reg in params.registrations {
2158                                        if reg.method == "workspace/didChangeWatchedFiles" {
2159                                            if let Some(options) = reg.register_options {
2160                                                let options = serde_json::from_value(options)?;
2161                                                this.update(&mut cx, |this, cx| {
2162                                                    this.on_lsp_did_change_watched_files(
2163                                                        server_id, options, cx,
2164                                                    );
2165                                                });
2166                                            }
2167                                        }
2168                                    }
2169                                    Ok(())
2170                                }
2171                            })
2172                            .detach();
2173
2174                        language_server
2175                            .on_request::<lsp::request::ApplyWorkspaceEdit, _, _>({
2176                                let this = this.downgrade();
2177                                let adapter = adapter.clone();
2178                                let language_server = language_server.clone();
2179                                move |params, cx| {
2180                                    Self::on_lsp_workspace_edit(
2181                                        this,
2182                                        params,
2183                                        server_id,
2184                                        adapter.clone(),
2185                                        language_server.clone(),
2186                                        cx,
2187                                    )
2188                                }
2189                            })
2190                            .detach();
2191
2192                        let disk_based_diagnostics_progress_token =
2193                            adapter.disk_based_diagnostics_progress_token.clone();
2194
2195                        language_server
2196                            .on_notification::<lsp::notification::Progress, _>({
2197                                let this = this.downgrade();
2198                                move |params, mut cx| {
2199                                    if let Some(this) = this.upgrade(&cx) {
2200                                        this.update(&mut cx, |this, cx| {
2201                                            this.on_lsp_progress(
2202                                                params,
2203                                                server_id,
2204                                                disk_based_diagnostics_progress_token.clone(),
2205                                                cx,
2206                                            );
2207                                        });
2208                                    }
2209                                }
2210                            })
2211                            .detach();
2212
2213                        language_server
2214                            .notify::<lsp::notification::DidChangeConfiguration>(
2215                                lsp::DidChangeConfigurationParams {
2216                                    settings: workspace_config,
2217                                },
2218                            )
2219                            .ok();
2220
2221                        this.update(&mut cx, |this, cx| {
2222                            // If the language server for this key doesn't match the server id, don't store the
2223                            // server. Which will cause it to be dropped, killing the process
2224                            if this
2225                                .language_server_ids
2226                                .get(&key)
2227                                .map(|id| id != &server_id)
2228                                .unwrap_or(false)
2229                            {
2230                                return None;
2231                            }
2232
2233                            // Update language_servers collection with Running variant of LanguageServerState
2234                            // indicating that the server is up and running and ready
2235                            this.language_servers.insert(
2236                                server_id,
2237                                LanguageServerState::Running {
2238                                    adapter: adapter.clone(),
2239                                    language,
2240                                    watched_paths: Default::default(),
2241                                    server: language_server.clone(),
2242                                    simulate_disk_based_diagnostics_completion: None,
2243                                },
2244                            );
2245                            this.language_server_statuses.insert(
2246                                server_id,
2247                                LanguageServerStatus {
2248                                    name: language_server.name().to_string(),
2249                                    pending_work: Default::default(),
2250                                    has_pending_diagnostic_updates: false,
2251                                    progress_tokens: Default::default(),
2252                                },
2253                            );
2254
2255                            if let Some(project_id) = this.remote_id() {
2256                                this.client
2257                                    .send(proto::StartLanguageServer {
2258                                        project_id,
2259                                        server: Some(proto::LanguageServer {
2260                                            id: server_id as u64,
2261                                            name: language_server.name().to_string(),
2262                                        }),
2263                                    })
2264                                    .log_err();
2265                            }
2266
2267                            // Tell the language server about every open buffer in the worktree that matches the language.
2268                            for buffer in this.opened_buffers.values() {
2269                                if let Some(buffer_handle) = buffer.upgrade(cx) {
2270                                    let buffer = buffer_handle.read(cx);
2271                                    let file = if let Some(file) = File::from_dyn(buffer.file()) {
2272                                        file
2273                                    } else {
2274                                        continue;
2275                                    };
2276                                    let language = if let Some(language) = buffer.language() {
2277                                        language
2278                                    } else {
2279                                        continue;
2280                                    };
2281                                    if file.worktree.read(cx).id() != key.0
2282                                        || language.lsp_adapter().map(|a| a.name.clone())
2283                                            != Some(key.1.clone())
2284                                    {
2285                                        continue;
2286                                    }
2287
2288                                    let file = file.as_local()?;
2289                                    let versions = this
2290                                        .buffer_snapshots
2291                                        .entry(buffer.remote_id())
2292                                        .or_insert_with(|| vec![(0, buffer.text_snapshot())]);
2293
2294                                    let (version, initial_snapshot) = versions.last().unwrap();
2295                                    let uri = lsp::Url::from_file_path(file.abs_path(cx)).unwrap();
2296                                    language_server
2297                                        .notify::<lsp::notification::DidOpenTextDocument>(
2298                                            lsp::DidOpenTextDocumentParams {
2299                                                text_document: lsp::TextDocumentItem::new(
2300                                                    uri,
2301                                                    adapter
2302                                                        .language_ids
2303                                                        .get(language.name().as_ref())
2304                                                        .cloned()
2305                                                        .unwrap_or_default(),
2306                                                    *version,
2307                                                    initial_snapshot.text(),
2308                                                ),
2309                                            },
2310                                        )
2311                                        .log_err()?;
2312                                    buffer_handle.update(cx, |buffer, cx| {
2313                                        buffer.set_completion_triggers(
2314                                            language_server
2315                                                .capabilities()
2316                                                .completion_provider
2317                                                .as_ref()
2318                                                .and_then(|provider| {
2319                                                    provider.trigger_characters.clone()
2320                                                })
2321                                                .unwrap_or_default(),
2322                                            cx,
2323                                        )
2324                                    });
2325                                }
2326                            }
2327
2328                            cx.notify();
2329                            Some(language_server)
2330                        })
2331                    })),
2332                );
2333
2334                server_id
2335            });
2336    }
2337
2338    // Returns a list of all of the worktrees which no longer have a language server and the root path
2339    // for the stopped server
2340    fn stop_language_server(
2341        &mut self,
2342        worktree_id: WorktreeId,
2343        adapter_name: LanguageServerName,
2344        cx: &mut ModelContext<Self>,
2345    ) -> Task<(Option<PathBuf>, Vec<WorktreeId>)> {
2346        let key = (worktree_id, adapter_name);
2347        if let Some(server_id) = self.language_server_ids.remove(&key) {
2348            // Remove other entries for this language server as well
2349            let mut orphaned_worktrees = vec![worktree_id];
2350            let other_keys = self.language_server_ids.keys().cloned().collect::<Vec<_>>();
2351            for other_key in other_keys {
2352                if self.language_server_ids.get(&other_key) == Some(&server_id) {
2353                    self.language_server_ids.remove(&other_key);
2354                    orphaned_worktrees.push(other_key.0);
2355                }
2356            }
2357
2358            self.language_server_statuses.remove(&server_id);
2359            cx.notify();
2360
2361            let server_state = self.language_servers.remove(&server_id);
2362            cx.spawn_weak(|this, mut cx| async move {
2363                let mut root_path = None;
2364
2365                let server = match server_state {
2366                    Some(LanguageServerState::Starting(started_language_server)) => {
2367                        started_language_server.await
2368                    }
2369                    Some(LanguageServerState::Running { server, .. }) => Some(server),
2370                    None => None,
2371                };
2372
2373                if let Some(server) = server {
2374                    root_path = Some(server.root_path().clone());
2375                    if let Some(shutdown) = server.shutdown() {
2376                        shutdown.await;
2377                    }
2378                }
2379
2380                if let Some(this) = this.upgrade(&cx) {
2381                    this.update(&mut cx, |this, cx| {
2382                        this.language_server_statuses.remove(&server_id);
2383                        cx.notify();
2384                    });
2385                }
2386
2387                (root_path, orphaned_worktrees)
2388            })
2389        } else {
2390            Task::ready((None, Vec::new()))
2391        }
2392    }
2393
2394    pub fn restart_language_servers_for_buffers(
2395        &mut self,
2396        buffers: impl IntoIterator<Item = ModelHandle<Buffer>>,
2397        cx: &mut ModelContext<Self>,
2398    ) -> Option<()> {
2399        let language_server_lookup_info: HashSet<(WorktreeId, Arc<Path>, PathBuf)> = buffers
2400            .into_iter()
2401            .filter_map(|buffer| {
2402                let file = File::from_dyn(buffer.read(cx).file())?;
2403                let worktree = file.worktree.read(cx).as_local()?;
2404                let worktree_id = worktree.id();
2405                let worktree_abs_path = worktree.abs_path().clone();
2406                let full_path = file.full_path(cx);
2407                Some((worktree_id, worktree_abs_path, full_path))
2408            })
2409            .collect();
2410        for (worktree_id, worktree_abs_path, full_path) in language_server_lookup_info {
2411            if let Some(language) = self
2412                .languages
2413                .language_for_path(&full_path)
2414                .now_or_never()
2415                .and_then(|language| language.ok())
2416            {
2417                self.restart_language_server(worktree_id, worktree_abs_path, language, cx);
2418            }
2419        }
2420
2421        None
2422    }
2423
2424    fn restart_language_server(
2425        &mut self,
2426        worktree_id: WorktreeId,
2427        fallback_path: Arc<Path>,
2428        language: Arc<Language>,
2429        cx: &mut ModelContext<Self>,
2430    ) {
2431        let adapter = if let Some(adapter) = language.lsp_adapter() {
2432            adapter
2433        } else {
2434            return;
2435        };
2436
2437        let server_name = adapter.name.clone();
2438        let stop = self.stop_language_server(worktree_id, server_name.clone(), cx);
2439        cx.spawn_weak(|this, mut cx| async move {
2440            let (original_root_path, orphaned_worktrees) = stop.await;
2441            if let Some(this) = this.upgrade(&cx) {
2442                this.update(&mut cx, |this, cx| {
2443                    // Attempt to restart using original server path. Fallback to passed in
2444                    // path if we could not retrieve the root path
2445                    let root_path = original_root_path
2446                        .map(|path_buf| Arc::from(path_buf.as_path()))
2447                        .unwrap_or(fallback_path);
2448
2449                    this.start_language_server(worktree_id, root_path, language, cx);
2450
2451                    // Lookup new server id and set it for each of the orphaned worktrees
2452                    if let Some(new_server_id) = this
2453                        .language_server_ids
2454                        .get(&(worktree_id, server_name.clone()))
2455                        .cloned()
2456                    {
2457                        for orphaned_worktree in orphaned_worktrees {
2458                            this.language_server_ids
2459                                .insert((orphaned_worktree, server_name.clone()), new_server_id);
2460                        }
2461                    }
2462                });
2463            }
2464        })
2465        .detach();
2466    }
2467
2468    fn on_lsp_progress(
2469        &mut self,
2470        progress: lsp::ProgressParams,
2471        server_id: usize,
2472        disk_based_diagnostics_progress_token: Option<String>,
2473        cx: &mut ModelContext<Self>,
2474    ) {
2475        let token = match progress.token {
2476            lsp::NumberOrString::String(token) => token,
2477            lsp::NumberOrString::Number(token) => {
2478                log::info!("skipping numeric progress token {}", token);
2479                return;
2480            }
2481        };
2482        let lsp::ProgressParamsValue::WorkDone(progress) = progress.value;
2483        let language_server_status =
2484            if let Some(status) = self.language_server_statuses.get_mut(&server_id) {
2485                status
2486            } else {
2487                return;
2488            };
2489
2490        if !language_server_status.progress_tokens.contains(&token) {
2491            return;
2492        }
2493
2494        let is_disk_based_diagnostics_progress = disk_based_diagnostics_progress_token
2495            .as_ref()
2496            .map_or(false, |disk_based_token| {
2497                token.starts_with(disk_based_token)
2498            });
2499
2500        match progress {
2501            lsp::WorkDoneProgress::Begin(report) => {
2502                if is_disk_based_diagnostics_progress {
2503                    language_server_status.has_pending_diagnostic_updates = true;
2504                    self.disk_based_diagnostics_started(server_id, cx);
2505                    self.broadcast_language_server_update(
2506                        server_id,
2507                        proto::update_language_server::Variant::DiskBasedDiagnosticsUpdating(
2508                            proto::LspDiskBasedDiagnosticsUpdating {},
2509                        ),
2510                    );
2511                } else {
2512                    self.on_lsp_work_start(
2513                        server_id,
2514                        token.clone(),
2515                        LanguageServerProgress {
2516                            message: report.message.clone(),
2517                            percentage: report.percentage.map(|p| p as usize),
2518                            last_update_at: Instant::now(),
2519                        },
2520                        cx,
2521                    );
2522                    self.broadcast_language_server_update(
2523                        server_id,
2524                        proto::update_language_server::Variant::WorkStart(proto::LspWorkStart {
2525                            token,
2526                            message: report.message,
2527                            percentage: report.percentage.map(|p| p as u32),
2528                        }),
2529                    );
2530                }
2531            }
2532            lsp::WorkDoneProgress::Report(report) => {
2533                if !is_disk_based_diagnostics_progress {
2534                    self.on_lsp_work_progress(
2535                        server_id,
2536                        token.clone(),
2537                        LanguageServerProgress {
2538                            message: report.message.clone(),
2539                            percentage: report.percentage.map(|p| p as usize),
2540                            last_update_at: Instant::now(),
2541                        },
2542                        cx,
2543                    );
2544                    self.broadcast_language_server_update(
2545                        server_id,
2546                        proto::update_language_server::Variant::WorkProgress(
2547                            proto::LspWorkProgress {
2548                                token,
2549                                message: report.message,
2550                                percentage: report.percentage.map(|p| p as u32),
2551                            },
2552                        ),
2553                    );
2554                }
2555            }
2556            lsp::WorkDoneProgress::End(_) => {
2557                language_server_status.progress_tokens.remove(&token);
2558
2559                if is_disk_based_diagnostics_progress {
2560                    language_server_status.has_pending_diagnostic_updates = false;
2561                    self.disk_based_diagnostics_finished(server_id, cx);
2562                    self.broadcast_language_server_update(
2563                        server_id,
2564                        proto::update_language_server::Variant::DiskBasedDiagnosticsUpdated(
2565                            proto::LspDiskBasedDiagnosticsUpdated {},
2566                        ),
2567                    );
2568                } else {
2569                    self.on_lsp_work_end(server_id, token.clone(), cx);
2570                    self.broadcast_language_server_update(
2571                        server_id,
2572                        proto::update_language_server::Variant::WorkEnd(proto::LspWorkEnd {
2573                            token,
2574                        }),
2575                    );
2576                }
2577            }
2578        }
2579    }
2580
2581    fn on_lsp_work_start(
2582        &mut self,
2583        language_server_id: usize,
2584        token: String,
2585        progress: LanguageServerProgress,
2586        cx: &mut ModelContext<Self>,
2587    ) {
2588        if let Some(status) = self.language_server_statuses.get_mut(&language_server_id) {
2589            status.pending_work.insert(token, progress);
2590            cx.notify();
2591        }
2592    }
2593
2594    fn on_lsp_work_progress(
2595        &mut self,
2596        language_server_id: usize,
2597        token: String,
2598        progress: LanguageServerProgress,
2599        cx: &mut ModelContext<Self>,
2600    ) {
2601        if let Some(status) = self.language_server_statuses.get_mut(&language_server_id) {
2602            let entry = status
2603                .pending_work
2604                .entry(token)
2605                .or_insert(LanguageServerProgress {
2606                    message: Default::default(),
2607                    percentage: Default::default(),
2608                    last_update_at: progress.last_update_at,
2609                });
2610            if progress.message.is_some() {
2611                entry.message = progress.message;
2612            }
2613            if progress.percentage.is_some() {
2614                entry.percentage = progress.percentage;
2615            }
2616            entry.last_update_at = progress.last_update_at;
2617            cx.notify();
2618        }
2619    }
2620
2621    fn on_lsp_work_end(
2622        &mut self,
2623        language_server_id: usize,
2624        token: String,
2625        cx: &mut ModelContext<Self>,
2626    ) {
2627        if let Some(status) = self.language_server_statuses.get_mut(&language_server_id) {
2628            status.pending_work.remove(&token);
2629            cx.notify();
2630        }
2631    }
2632
2633    fn on_lsp_did_change_watched_files(
2634        &mut self,
2635        language_server_id: usize,
2636        params: DidChangeWatchedFilesRegistrationOptions,
2637        cx: &mut ModelContext<Self>,
2638    ) {
2639        if let Some(LanguageServerState::Running { watched_paths, .. }) =
2640            self.language_servers.get_mut(&language_server_id)
2641        {
2642            watched_paths.clear();
2643            for watcher in params.watchers {
2644                watched_paths.add_pattern(&watcher.glob_pattern).log_err();
2645            }
2646            cx.notify();
2647        }
2648    }
2649
2650    async fn on_lsp_workspace_edit(
2651        this: WeakModelHandle<Self>,
2652        params: lsp::ApplyWorkspaceEditParams,
2653        server_id: usize,
2654        adapter: Arc<CachedLspAdapter>,
2655        language_server: Arc<LanguageServer>,
2656        mut cx: AsyncAppContext,
2657    ) -> Result<lsp::ApplyWorkspaceEditResponse> {
2658        let this = this
2659            .upgrade(&cx)
2660            .ok_or_else(|| anyhow!("project project closed"))?;
2661        let transaction = Self::deserialize_workspace_edit(
2662            this.clone(),
2663            params.edit,
2664            true,
2665            adapter.clone(),
2666            language_server.clone(),
2667            &mut cx,
2668        )
2669        .await
2670        .log_err();
2671        this.update(&mut cx, |this, _| {
2672            if let Some(transaction) = transaction {
2673                this.last_workspace_edits_by_language_server
2674                    .insert(server_id, transaction);
2675            }
2676        });
2677        Ok(lsp::ApplyWorkspaceEditResponse {
2678            applied: true,
2679            failed_change: None,
2680            failure_reason: None,
2681        })
2682    }
2683
2684    fn broadcast_language_server_update(
2685        &self,
2686        language_server_id: usize,
2687        event: proto::update_language_server::Variant,
2688    ) {
2689        if let Some(project_id) = self.remote_id() {
2690            self.client
2691                .send(proto::UpdateLanguageServer {
2692                    project_id,
2693                    language_server_id: language_server_id as u64,
2694                    variant: Some(event),
2695                })
2696                .log_err();
2697        }
2698    }
2699
2700    pub fn language_server_statuses(
2701        &self,
2702    ) -> impl DoubleEndedIterator<Item = &LanguageServerStatus> {
2703        self.language_server_statuses.values()
2704    }
2705
2706    pub fn update_diagnostics(
2707        &mut self,
2708        language_server_id: usize,
2709        mut params: lsp::PublishDiagnosticsParams,
2710        disk_based_sources: &[String],
2711        cx: &mut ModelContext<Self>,
2712    ) -> Result<()> {
2713        let abs_path = params
2714            .uri
2715            .to_file_path()
2716            .map_err(|_| anyhow!("URI is not a file"))?;
2717        let mut diagnostics = Vec::default();
2718        let mut primary_diagnostic_group_ids = HashMap::default();
2719        let mut sources_by_group_id = HashMap::default();
2720        let mut supporting_diagnostics = HashMap::default();
2721
2722        // Ensure that primary diagnostics are always the most severe
2723        params.diagnostics.sort_by_key(|item| item.severity);
2724
2725        for diagnostic in &params.diagnostics {
2726            let source = diagnostic.source.as_ref();
2727            let code = diagnostic.code.as_ref().map(|code| match code {
2728                lsp::NumberOrString::Number(code) => code.to_string(),
2729                lsp::NumberOrString::String(code) => code.clone(),
2730            });
2731            let range = range_from_lsp(diagnostic.range);
2732            let is_supporting = diagnostic
2733                .related_information
2734                .as_ref()
2735                .map_or(false, |infos| {
2736                    infos.iter().any(|info| {
2737                        primary_diagnostic_group_ids.contains_key(&(
2738                            source,
2739                            code.clone(),
2740                            range_from_lsp(info.location.range),
2741                        ))
2742                    })
2743                });
2744
2745            let is_unnecessary = diagnostic.tags.as_ref().map_or(false, |tags| {
2746                tags.iter().any(|tag| *tag == DiagnosticTag::UNNECESSARY)
2747            });
2748
2749            if is_supporting {
2750                supporting_diagnostics.insert(
2751                    (source, code.clone(), range),
2752                    (diagnostic.severity, is_unnecessary),
2753                );
2754            } else {
2755                let group_id = post_inc(&mut self.next_diagnostic_group_id);
2756                let is_disk_based =
2757                    source.map_or(false, |source| disk_based_sources.contains(source));
2758
2759                sources_by_group_id.insert(group_id, source);
2760                primary_diagnostic_group_ids
2761                    .insert((source, code.clone(), range.clone()), group_id);
2762
2763                diagnostics.push(DiagnosticEntry {
2764                    range,
2765                    diagnostic: Diagnostic {
2766                        code: code.clone(),
2767                        severity: diagnostic.severity.unwrap_or(DiagnosticSeverity::ERROR),
2768                        message: diagnostic.message.clone(),
2769                        group_id,
2770                        is_primary: true,
2771                        is_valid: true,
2772                        is_disk_based,
2773                        is_unnecessary,
2774                    },
2775                });
2776                if let Some(infos) = &diagnostic.related_information {
2777                    for info in infos {
2778                        if info.location.uri == params.uri && !info.message.is_empty() {
2779                            let range = range_from_lsp(info.location.range);
2780                            diagnostics.push(DiagnosticEntry {
2781                                range,
2782                                diagnostic: Diagnostic {
2783                                    code: code.clone(),
2784                                    severity: DiagnosticSeverity::INFORMATION,
2785                                    message: info.message.clone(),
2786                                    group_id,
2787                                    is_primary: false,
2788                                    is_valid: true,
2789                                    is_disk_based,
2790                                    is_unnecessary: false,
2791                                },
2792                            });
2793                        }
2794                    }
2795                }
2796            }
2797        }
2798
2799        for entry in &mut diagnostics {
2800            let diagnostic = &mut entry.diagnostic;
2801            if !diagnostic.is_primary {
2802                let source = *sources_by_group_id.get(&diagnostic.group_id).unwrap();
2803                if let Some(&(severity, is_unnecessary)) = supporting_diagnostics.get(&(
2804                    source,
2805                    diagnostic.code.clone(),
2806                    entry.range.clone(),
2807                )) {
2808                    if let Some(severity) = severity {
2809                        diagnostic.severity = severity;
2810                    }
2811                    diagnostic.is_unnecessary = is_unnecessary;
2812                }
2813            }
2814        }
2815
2816        self.update_diagnostic_entries(
2817            language_server_id,
2818            abs_path,
2819            params.version,
2820            diagnostics,
2821            cx,
2822        )?;
2823        Ok(())
2824    }
2825
2826    pub fn update_diagnostic_entries(
2827        &mut self,
2828        language_server_id: usize,
2829        abs_path: PathBuf,
2830        version: Option<i32>,
2831        diagnostics: Vec<DiagnosticEntry<Unclipped<PointUtf16>>>,
2832        cx: &mut ModelContext<Project>,
2833    ) -> Result<(), anyhow::Error> {
2834        let (worktree, relative_path) = self
2835            .find_local_worktree(&abs_path, cx)
2836            .ok_or_else(|| anyhow!("no worktree found for diagnostics"))?;
2837
2838        let project_path = ProjectPath {
2839            worktree_id: worktree.read(cx).id(),
2840            path: relative_path.into(),
2841        };
2842
2843        if let Some(buffer) = self.get_open_buffer(&project_path, cx) {
2844            self.update_buffer_diagnostics(&buffer, diagnostics.clone(), version, cx)?;
2845        }
2846
2847        let updated = worktree.update(cx, |worktree, cx| {
2848            worktree
2849                .as_local_mut()
2850                .ok_or_else(|| anyhow!("not a local worktree"))?
2851                .update_diagnostics(
2852                    language_server_id,
2853                    project_path.path.clone(),
2854                    diagnostics,
2855                    cx,
2856                )
2857        })?;
2858        if updated {
2859            cx.emit(Event::DiagnosticsUpdated {
2860                language_server_id,
2861                path: project_path,
2862            });
2863        }
2864        Ok(())
2865    }
2866
2867    fn update_buffer_diagnostics(
2868        &mut self,
2869        buffer: &ModelHandle<Buffer>,
2870        mut diagnostics: Vec<DiagnosticEntry<Unclipped<PointUtf16>>>,
2871        version: Option<i32>,
2872        cx: &mut ModelContext<Self>,
2873    ) -> Result<()> {
2874        fn compare_diagnostics(a: &Diagnostic, b: &Diagnostic) -> Ordering {
2875            Ordering::Equal
2876                .then_with(|| b.is_primary.cmp(&a.is_primary))
2877                .then_with(|| a.is_disk_based.cmp(&b.is_disk_based))
2878                .then_with(|| a.severity.cmp(&b.severity))
2879                .then_with(|| a.message.cmp(&b.message))
2880        }
2881
2882        let snapshot = self.buffer_snapshot_for_lsp_version(buffer, version, cx)?;
2883
2884        diagnostics.sort_unstable_by(|a, b| {
2885            Ordering::Equal
2886                .then_with(|| a.range.start.cmp(&b.range.start))
2887                .then_with(|| b.range.end.cmp(&a.range.end))
2888                .then_with(|| compare_diagnostics(&a.diagnostic, &b.diagnostic))
2889        });
2890
2891        let mut sanitized_diagnostics = Vec::new();
2892        let edits_since_save = Patch::new(
2893            snapshot
2894                .edits_since::<Unclipped<PointUtf16>>(buffer.read(cx).saved_version())
2895                .collect(),
2896        );
2897        for entry in diagnostics {
2898            let start;
2899            let end;
2900            if entry.diagnostic.is_disk_based {
2901                // Some diagnostics are based on files on disk instead of buffers'
2902                // current contents. Adjust these diagnostics' ranges to reflect
2903                // any unsaved edits.
2904                start = edits_since_save.old_to_new(entry.range.start);
2905                end = edits_since_save.old_to_new(entry.range.end);
2906            } else {
2907                start = entry.range.start;
2908                end = entry.range.end;
2909            }
2910
2911            let mut range = snapshot.clip_point_utf16(start, Bias::Left)
2912                ..snapshot.clip_point_utf16(end, Bias::Right);
2913
2914            // Expand empty ranges by one codepoint
2915            if range.start == range.end {
2916                // This will be go to the next boundary when being clipped
2917                range.end.column += 1;
2918                range.end = snapshot.clip_point_utf16(Unclipped(range.end), Bias::Right);
2919                if range.start == range.end && range.end.column > 0 {
2920                    range.start.column -= 1;
2921                    range.end = snapshot.clip_point_utf16(Unclipped(range.end), Bias::Left);
2922                }
2923            }
2924
2925            sanitized_diagnostics.push(DiagnosticEntry {
2926                range,
2927                diagnostic: entry.diagnostic,
2928            });
2929        }
2930        drop(edits_since_save);
2931
2932        let set = DiagnosticSet::new(sanitized_diagnostics, &snapshot);
2933        buffer.update(cx, |buffer, cx| buffer.update_diagnostics(set, cx));
2934        Ok(())
2935    }
2936
2937    pub fn reload_buffers(
2938        &self,
2939        buffers: HashSet<ModelHandle<Buffer>>,
2940        push_to_history: bool,
2941        cx: &mut ModelContext<Self>,
2942    ) -> Task<Result<ProjectTransaction>> {
2943        let mut local_buffers = Vec::new();
2944        let mut remote_buffers = None;
2945        for buffer_handle in buffers {
2946            let buffer = buffer_handle.read(cx);
2947            if buffer.is_dirty() {
2948                if let Some(file) = File::from_dyn(buffer.file()) {
2949                    if file.is_local() {
2950                        local_buffers.push(buffer_handle);
2951                    } else {
2952                        remote_buffers.get_or_insert(Vec::new()).push(buffer_handle);
2953                    }
2954                }
2955            }
2956        }
2957
2958        let remote_buffers = self.remote_id().zip(remote_buffers);
2959        let client = self.client.clone();
2960
2961        cx.spawn(|this, mut cx| async move {
2962            let mut project_transaction = ProjectTransaction::default();
2963
2964            if let Some((project_id, remote_buffers)) = remote_buffers {
2965                let response = client
2966                    .request(proto::ReloadBuffers {
2967                        project_id,
2968                        buffer_ids: remote_buffers
2969                            .iter()
2970                            .map(|buffer| buffer.read_with(&cx, |buffer, _| buffer.remote_id()))
2971                            .collect(),
2972                    })
2973                    .await?
2974                    .transaction
2975                    .ok_or_else(|| anyhow!("missing transaction"))?;
2976                project_transaction = this
2977                    .update(&mut cx, |this, cx| {
2978                        this.deserialize_project_transaction(response, push_to_history, cx)
2979                    })
2980                    .await?;
2981            }
2982
2983            for buffer in local_buffers {
2984                let transaction = buffer
2985                    .update(&mut cx, |buffer, cx| buffer.reload(cx))
2986                    .await?;
2987                buffer.update(&mut cx, |buffer, cx| {
2988                    if let Some(transaction) = transaction {
2989                        if !push_to_history {
2990                            buffer.forget_transaction(transaction.id);
2991                        }
2992                        project_transaction.0.insert(cx.handle(), transaction);
2993                    }
2994                });
2995            }
2996
2997            Ok(project_transaction)
2998        })
2999    }
3000
3001    pub fn format(
3002        &self,
3003        buffers: HashSet<ModelHandle<Buffer>>,
3004        push_to_history: bool,
3005        trigger: FormatTrigger,
3006        cx: &mut ModelContext<Project>,
3007    ) -> Task<Result<ProjectTransaction>> {
3008        if self.is_local() {
3009            let mut buffers_with_paths_and_servers = buffers
3010                .into_iter()
3011                .filter_map(|buffer_handle| {
3012                    let buffer = buffer_handle.read(cx);
3013                    let file = File::from_dyn(buffer.file())?;
3014                    let buffer_abs_path = file.as_local().map(|f| f.abs_path(cx));
3015                    let server = self
3016                        .language_server_for_buffer(buffer, cx)
3017                        .map(|s| s.1.clone());
3018                    Some((buffer_handle, buffer_abs_path, server))
3019                })
3020                .collect::<Vec<_>>();
3021
3022            cx.spawn(|this, mut cx| async move {
3023                // Do not allow multiple concurrent formatting requests for the
3024                // same buffer.
3025                this.update(&mut cx, |this, _| {
3026                    buffers_with_paths_and_servers
3027                        .retain(|(buffer, _, _)| this.buffers_being_formatted.insert(buffer.id()));
3028                });
3029
3030                let _cleanup = defer({
3031                    let this = this.clone();
3032                    let mut cx = cx.clone();
3033                    let buffers = &buffers_with_paths_and_servers;
3034                    move || {
3035                        this.update(&mut cx, |this, _| {
3036                            for (buffer, _, _) in buffers {
3037                                this.buffers_being_formatted.remove(&buffer.id());
3038                            }
3039                        });
3040                    }
3041                });
3042
3043                let mut project_transaction = ProjectTransaction::default();
3044                for (buffer, buffer_abs_path, language_server) in &buffers_with_paths_and_servers {
3045                    let (
3046                        format_on_save,
3047                        remove_trailing_whitespace,
3048                        ensure_final_newline,
3049                        formatter,
3050                        tab_size,
3051                    ) = buffer.read_with(&cx, |buffer, cx| {
3052                        let settings = cx.global::<Settings>();
3053                        let language_name = buffer.language().map(|language| language.name());
3054                        (
3055                            settings.format_on_save(language_name.as_deref()),
3056                            settings.remove_trailing_whitespace_on_save(language_name.as_deref()),
3057                            settings.ensure_final_newline_on_save(language_name.as_deref()),
3058                            settings.formatter(language_name.as_deref()),
3059                            settings.tab_size(language_name.as_deref()),
3060                        )
3061                    });
3062
3063                    // First, format buffer's whitespace according to the settings.
3064                    let trailing_whitespace_diff = if remove_trailing_whitespace {
3065                        Some(
3066                            buffer
3067                                .read_with(&cx, |b, cx| b.remove_trailing_whitespace(cx))
3068                                .await,
3069                        )
3070                    } else {
3071                        None
3072                    };
3073                    let whitespace_transaction_id = buffer.update(&mut cx, |buffer, cx| {
3074                        buffer.finalize_last_transaction();
3075                        buffer.start_transaction();
3076                        if let Some(diff) = trailing_whitespace_diff {
3077                            buffer.apply_diff(diff, cx);
3078                        }
3079                        if ensure_final_newline {
3080                            buffer.ensure_final_newline(cx);
3081                        }
3082                        buffer.end_transaction(cx)
3083                    });
3084
3085                    // Currently, formatting operations are represented differently depending on
3086                    // whether they come from a language server or an external command.
3087                    enum FormatOperation {
3088                        Lsp(Vec<(Range<Anchor>, String)>),
3089                        External(Diff),
3090                    }
3091
3092                    // Apply language-specific formatting using either a language server
3093                    // or external command.
3094                    let mut format_operation = None;
3095                    match (formatter, format_on_save) {
3096                        (_, FormatOnSave::Off) if trigger == FormatTrigger::Save => {}
3097
3098                        (Formatter::LanguageServer, FormatOnSave::On | FormatOnSave::Off)
3099                        | (_, FormatOnSave::LanguageServer) => {
3100                            if let Some((language_server, buffer_abs_path)) =
3101                                language_server.as_ref().zip(buffer_abs_path.as_ref())
3102                            {
3103                                format_operation = Some(FormatOperation::Lsp(
3104                                    Self::format_via_lsp(
3105                                        &this,
3106                                        &buffer,
3107                                        buffer_abs_path,
3108                                        &language_server,
3109                                        tab_size,
3110                                        &mut cx,
3111                                    )
3112                                    .await
3113                                    .context("failed to format via language server")?,
3114                                ));
3115                            }
3116                        }
3117
3118                        (
3119                            Formatter::External { command, arguments },
3120                            FormatOnSave::On | FormatOnSave::Off,
3121                        )
3122                        | (_, FormatOnSave::External { command, arguments }) => {
3123                            if let Some(buffer_abs_path) = buffer_abs_path {
3124                                format_operation = Self::format_via_external_command(
3125                                    &buffer,
3126                                    &buffer_abs_path,
3127                                    &command,
3128                                    &arguments,
3129                                    &mut cx,
3130                                )
3131                                .await
3132                                .context(format!(
3133                                    "failed to format via external command {:?}",
3134                                    command
3135                                ))?
3136                                .map(FormatOperation::External);
3137                            }
3138                        }
3139                    };
3140
3141                    buffer.update(&mut cx, |b, cx| {
3142                        // If the buffer had its whitespace formatted and was edited while the language-specific
3143                        // formatting was being computed, avoid applying the language-specific formatting, because
3144                        // it can't be grouped with the whitespace formatting in the undo history.
3145                        if let Some(transaction_id) = whitespace_transaction_id {
3146                            if b.peek_undo_stack()
3147                                .map_or(true, |e| e.transaction_id() != transaction_id)
3148                            {
3149                                format_operation.take();
3150                            }
3151                        }
3152
3153                        // Apply any language-specific formatting, and group the two formatting operations
3154                        // in the buffer's undo history.
3155                        if let Some(operation) = format_operation {
3156                            match operation {
3157                                FormatOperation::Lsp(edits) => {
3158                                    b.edit(edits, None, cx);
3159                                }
3160                                FormatOperation::External(diff) => {
3161                                    b.apply_diff(diff, cx);
3162                                }
3163                            }
3164
3165                            if let Some(transaction_id) = whitespace_transaction_id {
3166                                b.group_until_transaction(transaction_id);
3167                            }
3168                        }
3169
3170                        if let Some(transaction) = b.finalize_last_transaction().cloned() {
3171                            if !push_to_history {
3172                                b.forget_transaction(transaction.id);
3173                            }
3174                            project_transaction.0.insert(buffer.clone(), transaction);
3175                        }
3176                    });
3177                }
3178
3179                Ok(project_transaction)
3180            })
3181        } else {
3182            let remote_id = self.remote_id();
3183            let client = self.client.clone();
3184            cx.spawn(|this, mut cx| async move {
3185                let mut project_transaction = ProjectTransaction::default();
3186                if let Some(project_id) = remote_id {
3187                    let response = client
3188                        .request(proto::FormatBuffers {
3189                            project_id,
3190                            trigger: trigger as i32,
3191                            buffer_ids: buffers
3192                                .iter()
3193                                .map(|buffer| buffer.read_with(&cx, |buffer, _| buffer.remote_id()))
3194                                .collect(),
3195                        })
3196                        .await?
3197                        .transaction
3198                        .ok_or_else(|| anyhow!("missing transaction"))?;
3199                    project_transaction = this
3200                        .update(&mut cx, |this, cx| {
3201                            this.deserialize_project_transaction(response, push_to_history, cx)
3202                        })
3203                        .await?;
3204                }
3205                Ok(project_transaction)
3206            })
3207        }
3208    }
3209
3210    async fn format_via_lsp(
3211        this: &ModelHandle<Self>,
3212        buffer: &ModelHandle<Buffer>,
3213        abs_path: &Path,
3214        language_server: &Arc<LanguageServer>,
3215        tab_size: NonZeroU32,
3216        cx: &mut AsyncAppContext,
3217    ) -> Result<Vec<(Range<Anchor>, String)>> {
3218        let text_document =
3219            lsp::TextDocumentIdentifier::new(lsp::Url::from_file_path(abs_path).unwrap());
3220        let capabilities = &language_server.capabilities();
3221        let lsp_edits = if capabilities
3222            .document_formatting_provider
3223            .as_ref()
3224            .map_or(false, |provider| *provider != lsp::OneOf::Left(false))
3225        {
3226            language_server
3227                .request::<lsp::request::Formatting>(lsp::DocumentFormattingParams {
3228                    text_document,
3229                    options: lsp::FormattingOptions {
3230                        tab_size: tab_size.into(),
3231                        insert_spaces: true,
3232                        insert_final_newline: Some(true),
3233                        ..Default::default()
3234                    },
3235                    work_done_progress_params: Default::default(),
3236                })
3237                .await?
3238        } else if capabilities
3239            .document_range_formatting_provider
3240            .as_ref()
3241            .map_or(false, |provider| *provider != lsp::OneOf::Left(false))
3242        {
3243            let buffer_start = lsp::Position::new(0, 0);
3244            let buffer_end =
3245                buffer.read_with(cx, |buffer, _| point_to_lsp(buffer.max_point_utf16()));
3246            language_server
3247                .request::<lsp::request::RangeFormatting>(lsp::DocumentRangeFormattingParams {
3248                    text_document,
3249                    range: lsp::Range::new(buffer_start, buffer_end),
3250                    options: lsp::FormattingOptions {
3251                        tab_size: tab_size.into(),
3252                        insert_spaces: true,
3253                        insert_final_newline: Some(true),
3254                        ..Default::default()
3255                    },
3256                    work_done_progress_params: Default::default(),
3257                })
3258                .await?
3259        } else {
3260            None
3261        };
3262
3263        if let Some(lsp_edits) = lsp_edits {
3264            this.update(cx, |this, cx| {
3265                this.edits_from_lsp(buffer, lsp_edits, None, cx)
3266            })
3267            .await
3268        } else {
3269            Ok(Default::default())
3270        }
3271    }
3272
3273    async fn format_via_external_command(
3274        buffer: &ModelHandle<Buffer>,
3275        buffer_abs_path: &Path,
3276        command: &str,
3277        arguments: &[String],
3278        cx: &mut AsyncAppContext,
3279    ) -> Result<Option<Diff>> {
3280        let working_dir_path = buffer.read_with(cx, |buffer, cx| {
3281            let file = File::from_dyn(buffer.file())?;
3282            let worktree = file.worktree.read(cx).as_local()?;
3283            let mut worktree_path = worktree.abs_path().to_path_buf();
3284            if worktree.root_entry()?.is_file() {
3285                worktree_path.pop();
3286            }
3287            Some(worktree_path)
3288        });
3289
3290        if let Some(working_dir_path) = working_dir_path {
3291            let mut child =
3292                smol::process::Command::new(command)
3293                    .args(arguments.iter().map(|arg| {
3294                        arg.replace("{buffer_path}", &buffer_abs_path.to_string_lossy())
3295                    }))
3296                    .current_dir(&working_dir_path)
3297                    .stdin(smol::process::Stdio::piped())
3298                    .stdout(smol::process::Stdio::piped())
3299                    .stderr(smol::process::Stdio::piped())
3300                    .spawn()?;
3301            let stdin = child
3302                .stdin
3303                .as_mut()
3304                .ok_or_else(|| anyhow!("failed to acquire stdin"))?;
3305            let text = buffer.read_with(cx, |buffer, _| buffer.as_rope().clone());
3306            for chunk in text.chunks() {
3307                stdin.write_all(chunk.as_bytes()).await?;
3308            }
3309            stdin.flush().await?;
3310
3311            let output = child.output().await?;
3312            if !output.status.success() {
3313                return Err(anyhow!(
3314                    "command failed with exit code {:?}:\nstdout: {}\nstderr: {}",
3315                    output.status.code(),
3316                    String::from_utf8_lossy(&output.stdout),
3317                    String::from_utf8_lossy(&output.stderr),
3318                ));
3319            }
3320
3321            let stdout = String::from_utf8(output.stdout)?;
3322            Ok(Some(
3323                buffer
3324                    .read_with(cx, |buffer, cx| buffer.diff(stdout, cx))
3325                    .await,
3326            ))
3327        } else {
3328            Ok(None)
3329        }
3330    }
3331
3332    pub fn definition<T: ToPointUtf16>(
3333        &self,
3334        buffer: &ModelHandle<Buffer>,
3335        position: T,
3336        cx: &mut ModelContext<Self>,
3337    ) -> Task<Result<Vec<LocationLink>>> {
3338        let position = position.to_point_utf16(buffer.read(cx));
3339        self.request_lsp(buffer.clone(), GetDefinition { position }, cx)
3340    }
3341
3342    pub fn type_definition<T: ToPointUtf16>(
3343        &self,
3344        buffer: &ModelHandle<Buffer>,
3345        position: T,
3346        cx: &mut ModelContext<Self>,
3347    ) -> Task<Result<Vec<LocationLink>>> {
3348        let position = position.to_point_utf16(buffer.read(cx));
3349        self.request_lsp(buffer.clone(), GetTypeDefinition { position }, cx)
3350    }
3351
3352    pub fn references<T: ToPointUtf16>(
3353        &self,
3354        buffer: &ModelHandle<Buffer>,
3355        position: T,
3356        cx: &mut ModelContext<Self>,
3357    ) -> Task<Result<Vec<Location>>> {
3358        let position = position.to_point_utf16(buffer.read(cx));
3359        self.request_lsp(buffer.clone(), GetReferences { position }, cx)
3360    }
3361
3362    pub fn document_highlights<T: ToPointUtf16>(
3363        &self,
3364        buffer: &ModelHandle<Buffer>,
3365        position: T,
3366        cx: &mut ModelContext<Self>,
3367    ) -> Task<Result<Vec<DocumentHighlight>>> {
3368        let position = position.to_point_utf16(buffer.read(cx));
3369        self.request_lsp(buffer.clone(), GetDocumentHighlights { position }, cx)
3370    }
3371
3372    pub fn symbols(&self, query: &str, cx: &mut ModelContext<Self>) -> Task<Result<Vec<Symbol>>> {
3373        if self.is_local() {
3374            let mut requests = Vec::new();
3375            for ((worktree_id, _), server_id) in self.language_server_ids.iter() {
3376                let worktree_id = *worktree_id;
3377                if let Some(worktree) = self
3378                    .worktree_for_id(worktree_id, cx)
3379                    .and_then(|worktree| worktree.read(cx).as_local())
3380                {
3381                    if let Some(LanguageServerState::Running {
3382                        adapter,
3383                        language,
3384                        server,
3385                        ..
3386                    }) = self.language_servers.get(server_id)
3387                    {
3388                        let adapter = adapter.clone();
3389                        let language = language.clone();
3390                        let worktree_abs_path = worktree.abs_path().clone();
3391                        requests.push(
3392                            server
3393                                .request::<lsp::request::WorkspaceSymbol>(
3394                                    lsp::WorkspaceSymbolParams {
3395                                        query: query.to_string(),
3396                                        ..Default::default()
3397                                    },
3398                                )
3399                                .log_err()
3400                                .map(move |response| {
3401                                    (
3402                                        adapter,
3403                                        language,
3404                                        worktree_id,
3405                                        worktree_abs_path,
3406                                        response.unwrap_or_default(),
3407                                    )
3408                                }),
3409                        );
3410                    }
3411                }
3412            }
3413
3414            cx.spawn_weak(|this, cx| async move {
3415                let responses = futures::future::join_all(requests).await;
3416                let this = if let Some(this) = this.upgrade(&cx) {
3417                    this
3418                } else {
3419                    return Ok(Default::default());
3420                };
3421                let symbols = this.read_with(&cx, |this, cx| {
3422                    let mut symbols = Vec::new();
3423                    for (
3424                        adapter,
3425                        adapter_language,
3426                        source_worktree_id,
3427                        worktree_abs_path,
3428                        response,
3429                    ) in responses
3430                    {
3431                        symbols.extend(response.into_iter().flatten().filter_map(|lsp_symbol| {
3432                            let abs_path = lsp_symbol.location.uri.to_file_path().ok()?;
3433                            let mut worktree_id = source_worktree_id;
3434                            let path;
3435                            if let Some((worktree, rel_path)) =
3436                                this.find_local_worktree(&abs_path, cx)
3437                            {
3438                                worktree_id = worktree.read(cx).id();
3439                                path = rel_path;
3440                            } else {
3441                                path = relativize_path(&worktree_abs_path, &abs_path);
3442                            }
3443
3444                            let project_path = ProjectPath {
3445                                worktree_id,
3446                                path: path.into(),
3447                            };
3448                            let signature = this.symbol_signature(&project_path);
3449                            let adapter_language = adapter_language.clone();
3450                            let language = this
3451                                .languages
3452                                .language_for_path(&project_path.path)
3453                                .unwrap_or_else(move |_| adapter_language);
3454                            let language_server_name = adapter.name.clone();
3455                            Some(async move {
3456                                let language = language.await;
3457                                let label = language
3458                                    .label_for_symbol(&lsp_symbol.name, lsp_symbol.kind)
3459                                    .await;
3460
3461                                Symbol {
3462                                    language_server_name,
3463                                    source_worktree_id,
3464                                    path: project_path,
3465                                    label: label.unwrap_or_else(|| {
3466                                        CodeLabel::plain(lsp_symbol.name.clone(), None)
3467                                    }),
3468                                    kind: lsp_symbol.kind,
3469                                    name: lsp_symbol.name,
3470                                    range: range_from_lsp(lsp_symbol.location.range),
3471                                    signature,
3472                                }
3473                            })
3474                        }));
3475                    }
3476                    symbols
3477                });
3478                Ok(futures::future::join_all(symbols).await)
3479            })
3480        } else if let Some(project_id) = self.remote_id() {
3481            let request = self.client.request(proto::GetProjectSymbols {
3482                project_id,
3483                query: query.to_string(),
3484            });
3485            cx.spawn_weak(|this, cx| async move {
3486                let response = request.await?;
3487                let mut symbols = Vec::new();
3488                if let Some(this) = this.upgrade(&cx) {
3489                    let new_symbols = this.read_with(&cx, |this, _| {
3490                        response
3491                            .symbols
3492                            .into_iter()
3493                            .map(|symbol| this.deserialize_symbol(symbol))
3494                            .collect::<Vec<_>>()
3495                    });
3496                    symbols = futures::future::join_all(new_symbols)
3497                        .await
3498                        .into_iter()
3499                        .filter_map(|symbol| symbol.log_err())
3500                        .collect::<Vec<_>>();
3501                }
3502                Ok(symbols)
3503            })
3504        } else {
3505            Task::ready(Ok(Default::default()))
3506        }
3507    }
3508
3509    pub fn open_buffer_for_symbol(
3510        &mut self,
3511        symbol: &Symbol,
3512        cx: &mut ModelContext<Self>,
3513    ) -> Task<Result<ModelHandle<Buffer>>> {
3514        if self.is_local() {
3515            let language_server_id = if let Some(id) = self.language_server_ids.get(&(
3516                symbol.source_worktree_id,
3517                symbol.language_server_name.clone(),
3518            )) {
3519                *id
3520            } else {
3521                return Task::ready(Err(anyhow!(
3522                    "language server for worktree and language not found"
3523                )));
3524            };
3525
3526            let worktree_abs_path = if let Some(worktree_abs_path) = self
3527                .worktree_for_id(symbol.path.worktree_id, cx)
3528                .and_then(|worktree| worktree.read(cx).as_local())
3529                .map(|local_worktree| local_worktree.abs_path())
3530            {
3531                worktree_abs_path
3532            } else {
3533                return Task::ready(Err(anyhow!("worktree not found for symbol")));
3534            };
3535            let symbol_abs_path = worktree_abs_path.join(&symbol.path.path);
3536            let symbol_uri = if let Ok(uri) = lsp::Url::from_file_path(symbol_abs_path) {
3537                uri
3538            } else {
3539                return Task::ready(Err(anyhow!("invalid symbol path")));
3540            };
3541
3542            self.open_local_buffer_via_lsp(
3543                symbol_uri,
3544                language_server_id,
3545                symbol.language_server_name.clone(),
3546                cx,
3547            )
3548        } else if let Some(project_id) = self.remote_id() {
3549            let request = self.client.request(proto::OpenBufferForSymbol {
3550                project_id,
3551                symbol: Some(serialize_symbol(symbol)),
3552            });
3553            cx.spawn(|this, mut cx| async move {
3554                let response = request.await?;
3555                this.update(&mut cx, |this, cx| {
3556                    this.wait_for_remote_buffer(response.buffer_id, cx)
3557                })
3558                .await
3559            })
3560        } else {
3561            Task::ready(Err(anyhow!("project does not have a remote id")))
3562        }
3563    }
3564
3565    pub fn hover<T: ToPointUtf16>(
3566        &self,
3567        buffer: &ModelHandle<Buffer>,
3568        position: T,
3569        cx: &mut ModelContext<Self>,
3570    ) -> Task<Result<Option<Hover>>> {
3571        let position = position.to_point_utf16(buffer.read(cx));
3572        self.request_lsp(buffer.clone(), GetHover { position }, cx)
3573    }
3574
3575    pub fn completions<T: ToPointUtf16>(
3576        &self,
3577        source_buffer_handle: &ModelHandle<Buffer>,
3578        position: T,
3579        cx: &mut ModelContext<Self>,
3580    ) -> Task<Result<Vec<Completion>>> {
3581        let source_buffer_handle = source_buffer_handle.clone();
3582        let source_buffer = source_buffer_handle.read(cx);
3583        let buffer_id = source_buffer.remote_id();
3584        let language = source_buffer.language().cloned();
3585        let worktree;
3586        let buffer_abs_path;
3587        if let Some(file) = File::from_dyn(source_buffer.file()) {
3588            worktree = file.worktree.clone();
3589            buffer_abs_path = file.as_local().map(|f| f.abs_path(cx));
3590        } else {
3591            return Task::ready(Ok(Default::default()));
3592        };
3593
3594        let position = Unclipped(position.to_point_utf16(source_buffer));
3595        let anchor = source_buffer.anchor_after(position);
3596
3597        if worktree.read(cx).as_local().is_some() {
3598            let buffer_abs_path = buffer_abs_path.unwrap();
3599            let lang_server =
3600                if let Some((_, server)) = self.language_server_for_buffer(source_buffer, cx) {
3601                    server.clone()
3602                } else {
3603                    return Task::ready(Ok(Default::default()));
3604                };
3605
3606            cx.spawn(|_, cx| async move {
3607                let completions = lang_server
3608                    .request::<lsp::request::Completion>(lsp::CompletionParams {
3609                        text_document_position: lsp::TextDocumentPositionParams::new(
3610                            lsp::TextDocumentIdentifier::new(
3611                                lsp::Url::from_file_path(buffer_abs_path).unwrap(),
3612                            ),
3613                            point_to_lsp(position.0),
3614                        ),
3615                        context: Default::default(),
3616                        work_done_progress_params: Default::default(),
3617                        partial_result_params: Default::default(),
3618                    })
3619                    .await
3620                    .context("lsp completion request failed")?;
3621
3622                let completions = if let Some(completions) = completions {
3623                    match completions {
3624                        lsp::CompletionResponse::Array(completions) => completions,
3625                        lsp::CompletionResponse::List(list) => list.items,
3626                    }
3627                } else {
3628                    Default::default()
3629                };
3630
3631                let completions = source_buffer_handle.read_with(&cx, |this, _| {
3632                    let snapshot = this.snapshot();
3633                    let clipped_position = this.clip_point_utf16(position, Bias::Left);
3634                    let mut range_for_token = None;
3635                    completions
3636                        .into_iter()
3637                        .filter_map(move |mut lsp_completion| {
3638                            // For now, we can only handle additional edits if they are returned
3639                            // when resolving the completion, not if they are present initially.
3640                            if lsp_completion
3641                                .additional_text_edits
3642                                .as_ref()
3643                                .map_or(false, |edits| !edits.is_empty())
3644                            {
3645                                return None;
3646                            }
3647
3648                            let (old_range, mut new_text) = match lsp_completion.text_edit.as_ref()
3649                            {
3650                                // If the language server provides a range to overwrite, then
3651                                // check that the range is valid.
3652                                Some(lsp::CompletionTextEdit::Edit(edit)) => {
3653                                    let range = range_from_lsp(edit.range);
3654                                    let start = snapshot.clip_point_utf16(range.start, Bias::Left);
3655                                    let end = snapshot.clip_point_utf16(range.end, Bias::Left);
3656                                    if start != range.start.0 || end != range.end.0 {
3657                                        log::info!("completion out of expected range");
3658                                        return None;
3659                                    }
3660                                    (
3661                                        snapshot.anchor_before(start)..snapshot.anchor_after(end),
3662                                        edit.new_text.clone(),
3663                                    )
3664                                }
3665                                // If the language server does not provide a range, then infer
3666                                // the range based on the syntax tree.
3667                                None => {
3668                                    if position.0 != clipped_position {
3669                                        log::info!("completion out of expected range");
3670                                        return None;
3671                                    }
3672                                    let Range { start, end } = range_for_token
3673                                        .get_or_insert_with(|| {
3674                                            let offset = position.to_offset(&snapshot);
3675                                            let (range, kind) = snapshot.surrounding_word(offset);
3676                                            if kind == Some(CharKind::Word) {
3677                                                range
3678                                            } else {
3679                                                offset..offset
3680                                            }
3681                                        })
3682                                        .clone();
3683                                    let text = lsp_completion
3684                                        .insert_text
3685                                        .as_ref()
3686                                        .unwrap_or(&lsp_completion.label)
3687                                        .clone();
3688                                    (
3689                                        snapshot.anchor_before(start)..snapshot.anchor_after(end),
3690                                        text,
3691                                    )
3692                                }
3693                                Some(lsp::CompletionTextEdit::InsertAndReplace(_)) => {
3694                                    log::info!("unsupported insert/replace completion");
3695                                    return None;
3696                                }
3697                            };
3698
3699                            LineEnding::normalize(&mut new_text);
3700                            let language = language.clone();
3701                            Some(async move {
3702                                let mut label = None;
3703                                if let Some(language) = language {
3704                                    language.process_completion(&mut lsp_completion).await;
3705                                    label = language.label_for_completion(&lsp_completion).await;
3706                                }
3707                                Completion {
3708                                    old_range,
3709                                    new_text,
3710                                    label: label.unwrap_or_else(|| {
3711                                        CodeLabel::plain(
3712                                            lsp_completion.label.clone(),
3713                                            lsp_completion.filter_text.as_deref(),
3714                                        )
3715                                    }),
3716                                    lsp_completion,
3717                                }
3718                            })
3719                        })
3720                });
3721
3722                Ok(futures::future::join_all(completions).await)
3723            })
3724        } else if let Some(project_id) = self.remote_id() {
3725            let rpc = self.client.clone();
3726            let message = proto::GetCompletions {
3727                project_id,
3728                buffer_id,
3729                position: Some(language::proto::serialize_anchor(&anchor)),
3730                version: serialize_version(&source_buffer.version()),
3731            };
3732            cx.spawn_weak(|this, mut cx| async move {
3733                let response = rpc.request(message).await?;
3734
3735                if this
3736                    .upgrade(&cx)
3737                    .ok_or_else(|| anyhow!("project was dropped"))?
3738                    .read_with(&cx, |this, _| this.is_read_only())
3739                {
3740                    return Err(anyhow!(
3741                        "failed to get completions: project was disconnected"
3742                    ));
3743                } else {
3744                    source_buffer_handle
3745                        .update(&mut cx, |buffer, _| {
3746                            buffer.wait_for_version(deserialize_version(&response.version))
3747                        })
3748                        .await?;
3749
3750                    let completions = response.completions.into_iter().map(|completion| {
3751                        language::proto::deserialize_completion(completion, language.clone())
3752                    });
3753                    futures::future::try_join_all(completions).await
3754                }
3755            })
3756        } else {
3757            Task::ready(Ok(Default::default()))
3758        }
3759    }
3760
3761    pub fn apply_additional_edits_for_completion(
3762        &self,
3763        buffer_handle: ModelHandle<Buffer>,
3764        completion: Completion,
3765        push_to_history: bool,
3766        cx: &mut ModelContext<Self>,
3767    ) -> Task<Result<Option<Transaction>>> {
3768        let buffer = buffer_handle.read(cx);
3769        let buffer_id = buffer.remote_id();
3770
3771        if self.is_local() {
3772            let lang_server = match self.language_server_for_buffer(buffer, cx) {
3773                Some((_, server)) => server.clone(),
3774                _ => return Task::ready(Ok(Default::default())),
3775            };
3776
3777            cx.spawn(|this, mut cx| async move {
3778                let resolved_completion = lang_server
3779                    .request::<lsp::request::ResolveCompletionItem>(completion.lsp_completion)
3780                    .await?;
3781
3782                if let Some(edits) = resolved_completion.additional_text_edits {
3783                    let edits = this
3784                        .update(&mut cx, |this, cx| {
3785                            this.edits_from_lsp(&buffer_handle, edits, None, cx)
3786                        })
3787                        .await?;
3788
3789                    buffer_handle.update(&mut cx, |buffer, cx| {
3790                        buffer.finalize_last_transaction();
3791                        buffer.start_transaction();
3792
3793                        for (range, text) in edits {
3794                            let primary = &completion.old_range;
3795                            let start_within = primary.start.cmp(&range.start, buffer).is_le()
3796                                && primary.end.cmp(&range.start, buffer).is_ge();
3797                            let end_within = range.start.cmp(&primary.end, buffer).is_le()
3798                                && range.end.cmp(&primary.end, buffer).is_ge();
3799
3800                            //Skip addtional edits which overlap with the primary completion edit
3801                            //https://github.com/zed-industries/zed/pull/1871
3802                            if !start_within && !end_within {
3803                                buffer.edit([(range, text)], None, cx);
3804                            }
3805                        }
3806
3807                        let transaction = if buffer.end_transaction(cx).is_some() {
3808                            let transaction = buffer.finalize_last_transaction().unwrap().clone();
3809                            if !push_to_history {
3810                                buffer.forget_transaction(transaction.id);
3811                            }
3812                            Some(transaction)
3813                        } else {
3814                            None
3815                        };
3816                        Ok(transaction)
3817                    })
3818                } else {
3819                    Ok(None)
3820                }
3821            })
3822        } else if let Some(project_id) = self.remote_id() {
3823            let client = self.client.clone();
3824            cx.spawn(|_, mut cx| async move {
3825                let response = client
3826                    .request(proto::ApplyCompletionAdditionalEdits {
3827                        project_id,
3828                        buffer_id,
3829                        completion: Some(language::proto::serialize_completion(&completion)),
3830                    })
3831                    .await?;
3832
3833                if let Some(transaction) = response.transaction {
3834                    let transaction = language::proto::deserialize_transaction(transaction)?;
3835                    buffer_handle
3836                        .update(&mut cx, |buffer, _| {
3837                            buffer.wait_for_edits(transaction.edit_ids.iter().copied())
3838                        })
3839                        .await?;
3840                    if push_to_history {
3841                        buffer_handle.update(&mut cx, |buffer, _| {
3842                            buffer.push_transaction(transaction.clone(), Instant::now());
3843                        });
3844                    }
3845                    Ok(Some(transaction))
3846                } else {
3847                    Ok(None)
3848                }
3849            })
3850        } else {
3851            Task::ready(Err(anyhow!("project does not have a remote id")))
3852        }
3853    }
3854
3855    pub fn code_actions<T: Clone + ToOffset>(
3856        &self,
3857        buffer_handle: &ModelHandle<Buffer>,
3858        range: Range<T>,
3859        cx: &mut ModelContext<Self>,
3860    ) -> Task<Result<Vec<CodeAction>>> {
3861        let buffer_handle = buffer_handle.clone();
3862        let buffer = buffer_handle.read(cx);
3863        let snapshot = buffer.snapshot();
3864        let relevant_diagnostics = snapshot
3865            .diagnostics_in_range::<usize, usize>(range.to_offset(&snapshot), false)
3866            .map(|entry| entry.to_lsp_diagnostic_stub())
3867            .collect();
3868        let buffer_id = buffer.remote_id();
3869        let worktree;
3870        let buffer_abs_path;
3871        if let Some(file) = File::from_dyn(buffer.file()) {
3872            worktree = file.worktree.clone();
3873            buffer_abs_path = file.as_local().map(|f| f.abs_path(cx));
3874        } else {
3875            return Task::ready(Ok(Vec::new()));
3876        };
3877        let range = buffer.anchor_before(range.start)..buffer.anchor_before(range.end);
3878
3879        if worktree.read(cx).as_local().is_some() {
3880            let buffer_abs_path = buffer_abs_path.unwrap();
3881            let lang_server = if let Some((_, server)) = self.language_server_for_buffer(buffer, cx)
3882            {
3883                server.clone()
3884            } else {
3885                return Task::ready(Ok(Vec::new()));
3886            };
3887
3888            let lsp_range = range_to_lsp(range.to_point_utf16(buffer));
3889            cx.foreground().spawn(async move {
3890                if lang_server.capabilities().code_action_provider.is_none() {
3891                    return Ok(Vec::new());
3892                }
3893
3894                Ok(lang_server
3895                    .request::<lsp::request::CodeActionRequest>(lsp::CodeActionParams {
3896                        text_document: lsp::TextDocumentIdentifier::new(
3897                            lsp::Url::from_file_path(buffer_abs_path).unwrap(),
3898                        ),
3899                        range: lsp_range,
3900                        work_done_progress_params: Default::default(),
3901                        partial_result_params: Default::default(),
3902                        context: lsp::CodeActionContext {
3903                            diagnostics: relevant_diagnostics,
3904                            only: lang_server.code_action_kinds(),
3905                        },
3906                    })
3907                    .await?
3908                    .unwrap_or_default()
3909                    .into_iter()
3910                    .filter_map(|entry| {
3911                        if let lsp::CodeActionOrCommand::CodeAction(lsp_action) = entry {
3912                            Some(CodeAction {
3913                                range: range.clone(),
3914                                lsp_action,
3915                            })
3916                        } else {
3917                            None
3918                        }
3919                    })
3920                    .collect())
3921            })
3922        } else if let Some(project_id) = self.remote_id() {
3923            let rpc = self.client.clone();
3924            let version = buffer.version();
3925            cx.spawn_weak(|this, mut cx| async move {
3926                let response = rpc
3927                    .request(proto::GetCodeActions {
3928                        project_id,
3929                        buffer_id,
3930                        start: Some(language::proto::serialize_anchor(&range.start)),
3931                        end: Some(language::proto::serialize_anchor(&range.end)),
3932                        version: serialize_version(&version),
3933                    })
3934                    .await?;
3935
3936                if this
3937                    .upgrade(&cx)
3938                    .ok_or_else(|| anyhow!("project was dropped"))?
3939                    .read_with(&cx, |this, _| this.is_read_only())
3940                {
3941                    return Err(anyhow!(
3942                        "failed to get code actions: project was disconnected"
3943                    ));
3944                } else {
3945                    buffer_handle
3946                        .update(&mut cx, |buffer, _| {
3947                            buffer.wait_for_version(deserialize_version(&response.version))
3948                        })
3949                        .await?;
3950
3951                    response
3952                        .actions
3953                        .into_iter()
3954                        .map(language::proto::deserialize_code_action)
3955                        .collect()
3956                }
3957            })
3958        } else {
3959            Task::ready(Ok(Default::default()))
3960        }
3961    }
3962
3963    pub fn apply_code_action(
3964        &self,
3965        buffer_handle: ModelHandle<Buffer>,
3966        mut action: CodeAction,
3967        push_to_history: bool,
3968        cx: &mut ModelContext<Self>,
3969    ) -> Task<Result<ProjectTransaction>> {
3970        if self.is_local() {
3971            let buffer = buffer_handle.read(cx);
3972            let (lsp_adapter, lang_server) =
3973                if let Some((adapter, server)) = self.language_server_for_buffer(buffer, cx) {
3974                    (adapter.clone(), server.clone())
3975                } else {
3976                    return Task::ready(Ok(Default::default()));
3977                };
3978            let range = action.range.to_point_utf16(buffer);
3979
3980            cx.spawn(|this, mut cx| async move {
3981                if let Some(lsp_range) = action
3982                    .lsp_action
3983                    .data
3984                    .as_mut()
3985                    .and_then(|d| d.get_mut("codeActionParams"))
3986                    .and_then(|d| d.get_mut("range"))
3987                {
3988                    *lsp_range = serde_json::to_value(&range_to_lsp(range)).unwrap();
3989                    action.lsp_action = lang_server
3990                        .request::<lsp::request::CodeActionResolveRequest>(action.lsp_action)
3991                        .await?;
3992                } else {
3993                    let actions = this
3994                        .update(&mut cx, |this, cx| {
3995                            this.code_actions(&buffer_handle, action.range, cx)
3996                        })
3997                        .await?;
3998                    action.lsp_action = actions
3999                        .into_iter()
4000                        .find(|a| a.lsp_action.title == action.lsp_action.title)
4001                        .ok_or_else(|| anyhow!("code action is outdated"))?
4002                        .lsp_action;
4003                }
4004
4005                if let Some(edit) = action.lsp_action.edit {
4006                    if edit.changes.is_some() || edit.document_changes.is_some() {
4007                        return Self::deserialize_workspace_edit(
4008                            this,
4009                            edit,
4010                            push_to_history,
4011                            lsp_adapter.clone(),
4012                            lang_server.clone(),
4013                            &mut cx,
4014                        )
4015                        .await;
4016                    }
4017                }
4018
4019                if let Some(command) = action.lsp_action.command {
4020                    this.update(&mut cx, |this, _| {
4021                        this.last_workspace_edits_by_language_server
4022                            .remove(&lang_server.server_id());
4023                    });
4024                    lang_server
4025                        .request::<lsp::request::ExecuteCommand>(lsp::ExecuteCommandParams {
4026                            command: command.command,
4027                            arguments: command.arguments.unwrap_or_default(),
4028                            ..Default::default()
4029                        })
4030                        .await?;
4031                    return Ok(this.update(&mut cx, |this, _| {
4032                        this.last_workspace_edits_by_language_server
4033                            .remove(&lang_server.server_id())
4034                            .unwrap_or_default()
4035                    }));
4036                }
4037
4038                Ok(ProjectTransaction::default())
4039            })
4040        } else if let Some(project_id) = self.remote_id() {
4041            let client = self.client.clone();
4042            let request = proto::ApplyCodeAction {
4043                project_id,
4044                buffer_id: buffer_handle.read(cx).remote_id(),
4045                action: Some(language::proto::serialize_code_action(&action)),
4046            };
4047            cx.spawn(|this, mut cx| async move {
4048                let response = client
4049                    .request(request)
4050                    .await?
4051                    .transaction
4052                    .ok_or_else(|| anyhow!("missing transaction"))?;
4053                this.update(&mut cx, |this, cx| {
4054                    this.deserialize_project_transaction(response, push_to_history, cx)
4055                })
4056                .await
4057            })
4058        } else {
4059            Task::ready(Err(anyhow!("project does not have a remote id")))
4060        }
4061    }
4062
4063    async fn deserialize_workspace_edit(
4064        this: ModelHandle<Self>,
4065        edit: lsp::WorkspaceEdit,
4066        push_to_history: bool,
4067        lsp_adapter: Arc<CachedLspAdapter>,
4068        language_server: Arc<LanguageServer>,
4069        cx: &mut AsyncAppContext,
4070    ) -> Result<ProjectTransaction> {
4071        let fs = this.read_with(cx, |this, _| this.fs.clone());
4072        let mut operations = Vec::new();
4073        if let Some(document_changes) = edit.document_changes {
4074            match document_changes {
4075                lsp::DocumentChanges::Edits(edits) => {
4076                    operations.extend(edits.into_iter().map(lsp::DocumentChangeOperation::Edit))
4077                }
4078                lsp::DocumentChanges::Operations(ops) => operations = ops,
4079            }
4080        } else if let Some(changes) = edit.changes {
4081            operations.extend(changes.into_iter().map(|(uri, edits)| {
4082                lsp::DocumentChangeOperation::Edit(lsp::TextDocumentEdit {
4083                    text_document: lsp::OptionalVersionedTextDocumentIdentifier {
4084                        uri,
4085                        version: None,
4086                    },
4087                    edits: edits.into_iter().map(lsp::OneOf::Left).collect(),
4088                })
4089            }));
4090        }
4091
4092        let mut project_transaction = ProjectTransaction::default();
4093        for operation in operations {
4094            match operation {
4095                lsp::DocumentChangeOperation::Op(lsp::ResourceOp::Create(op)) => {
4096                    let abs_path = op
4097                        .uri
4098                        .to_file_path()
4099                        .map_err(|_| anyhow!("can't convert URI to path"))?;
4100
4101                    if let Some(parent_path) = abs_path.parent() {
4102                        fs.create_dir(parent_path).await?;
4103                    }
4104                    if abs_path.ends_with("/") {
4105                        fs.create_dir(&abs_path).await?;
4106                    } else {
4107                        fs.create_file(&abs_path, op.options.map(Into::into).unwrap_or_default())
4108                            .await?;
4109                    }
4110                }
4111                lsp::DocumentChangeOperation::Op(lsp::ResourceOp::Rename(op)) => {
4112                    let source_abs_path = op
4113                        .old_uri
4114                        .to_file_path()
4115                        .map_err(|_| anyhow!("can't convert URI to path"))?;
4116                    let target_abs_path = op
4117                        .new_uri
4118                        .to_file_path()
4119                        .map_err(|_| anyhow!("can't convert URI to path"))?;
4120                    fs.rename(
4121                        &source_abs_path,
4122                        &target_abs_path,
4123                        op.options.map(Into::into).unwrap_or_default(),
4124                    )
4125                    .await?;
4126                }
4127                lsp::DocumentChangeOperation::Op(lsp::ResourceOp::Delete(op)) => {
4128                    let abs_path = op
4129                        .uri
4130                        .to_file_path()
4131                        .map_err(|_| anyhow!("can't convert URI to path"))?;
4132                    let options = op.options.map(Into::into).unwrap_or_default();
4133                    if abs_path.ends_with("/") {
4134                        fs.remove_dir(&abs_path, options).await?;
4135                    } else {
4136                        fs.remove_file(&abs_path, options).await?;
4137                    }
4138                }
4139                lsp::DocumentChangeOperation::Edit(op) => {
4140                    let buffer_to_edit = this
4141                        .update(cx, |this, cx| {
4142                            this.open_local_buffer_via_lsp(
4143                                op.text_document.uri,
4144                                language_server.server_id(),
4145                                lsp_adapter.name.clone(),
4146                                cx,
4147                            )
4148                        })
4149                        .await?;
4150
4151                    let edits = this
4152                        .update(cx, |this, cx| {
4153                            let edits = op.edits.into_iter().map(|edit| match edit {
4154                                lsp::OneOf::Left(edit) => edit,
4155                                lsp::OneOf::Right(edit) => edit.text_edit,
4156                            });
4157                            this.edits_from_lsp(
4158                                &buffer_to_edit,
4159                                edits,
4160                                op.text_document.version,
4161                                cx,
4162                            )
4163                        })
4164                        .await?;
4165
4166                    let transaction = buffer_to_edit.update(cx, |buffer, cx| {
4167                        buffer.finalize_last_transaction();
4168                        buffer.start_transaction();
4169                        for (range, text) in edits {
4170                            buffer.edit([(range, text)], None, cx);
4171                        }
4172                        let transaction = if buffer.end_transaction(cx).is_some() {
4173                            let transaction = buffer.finalize_last_transaction().unwrap().clone();
4174                            if !push_to_history {
4175                                buffer.forget_transaction(transaction.id);
4176                            }
4177                            Some(transaction)
4178                        } else {
4179                            None
4180                        };
4181
4182                        transaction
4183                    });
4184                    if let Some(transaction) = transaction {
4185                        project_transaction.0.insert(buffer_to_edit, transaction);
4186                    }
4187                }
4188            }
4189        }
4190
4191        Ok(project_transaction)
4192    }
4193
4194    pub fn prepare_rename<T: ToPointUtf16>(
4195        &self,
4196        buffer: ModelHandle<Buffer>,
4197        position: T,
4198        cx: &mut ModelContext<Self>,
4199    ) -> Task<Result<Option<Range<Anchor>>>> {
4200        let position = position.to_point_utf16(buffer.read(cx));
4201        self.request_lsp(buffer, PrepareRename { position }, cx)
4202    }
4203
4204    pub fn perform_rename<T: ToPointUtf16>(
4205        &self,
4206        buffer: ModelHandle<Buffer>,
4207        position: T,
4208        new_name: String,
4209        push_to_history: bool,
4210        cx: &mut ModelContext<Self>,
4211    ) -> Task<Result<ProjectTransaction>> {
4212        let position = position.to_point_utf16(buffer.read(cx));
4213        self.request_lsp(
4214            buffer,
4215            PerformRename {
4216                position,
4217                new_name,
4218                push_to_history,
4219            },
4220            cx,
4221        )
4222    }
4223
4224    #[allow(clippy::type_complexity)]
4225    pub fn search(
4226        &self,
4227        query: SearchQuery,
4228        cx: &mut ModelContext<Self>,
4229    ) -> Task<Result<HashMap<ModelHandle<Buffer>, Vec<Range<Anchor>>>>> {
4230        if self.is_local() {
4231            let snapshots = self
4232                .visible_worktrees(cx)
4233                .filter_map(|tree| {
4234                    let tree = tree.read(cx).as_local()?;
4235                    Some(tree.snapshot())
4236                })
4237                .collect::<Vec<_>>();
4238
4239            let background = cx.background().clone();
4240            let path_count: usize = snapshots.iter().map(|s| s.visible_file_count()).sum();
4241            if path_count == 0 {
4242                return Task::ready(Ok(Default::default()));
4243            }
4244            let workers = background.num_cpus().min(path_count);
4245            let (matching_paths_tx, mut matching_paths_rx) = smol::channel::bounded(1024);
4246            cx.background()
4247                .spawn({
4248                    let fs = self.fs.clone();
4249                    let background = cx.background().clone();
4250                    let query = query.clone();
4251                    async move {
4252                        let fs = &fs;
4253                        let query = &query;
4254                        let matching_paths_tx = &matching_paths_tx;
4255                        let paths_per_worker = (path_count + workers - 1) / workers;
4256                        let snapshots = &snapshots;
4257                        background
4258                            .scoped(|scope| {
4259                                for worker_ix in 0..workers {
4260                                    let worker_start_ix = worker_ix * paths_per_worker;
4261                                    let worker_end_ix = worker_start_ix + paths_per_worker;
4262                                    scope.spawn(async move {
4263                                        let mut snapshot_start_ix = 0;
4264                                        let mut abs_path = PathBuf::new();
4265                                        for snapshot in snapshots {
4266                                            let snapshot_end_ix =
4267                                                snapshot_start_ix + snapshot.visible_file_count();
4268                                            if worker_end_ix <= snapshot_start_ix {
4269                                                break;
4270                                            } else if worker_start_ix > snapshot_end_ix {
4271                                                snapshot_start_ix = snapshot_end_ix;
4272                                                continue;
4273                                            } else {
4274                                                let start_in_snapshot = worker_start_ix
4275                                                    .saturating_sub(snapshot_start_ix);
4276                                                let end_in_snapshot =
4277                                                    cmp::min(worker_end_ix, snapshot_end_ix)
4278                                                        - snapshot_start_ix;
4279
4280                                                for entry in snapshot
4281                                                    .files(false, start_in_snapshot)
4282                                                    .take(end_in_snapshot - start_in_snapshot)
4283                                                {
4284                                                    if matching_paths_tx.is_closed() {
4285                                                        break;
4286                                                    }
4287
4288                                                    abs_path.clear();
4289                                                    abs_path.push(&snapshot.abs_path());
4290                                                    abs_path.push(&entry.path);
4291                                                    let matches = if let Some(file) =
4292                                                        fs.open_sync(&abs_path).await.log_err()
4293                                                    {
4294                                                        query.detect(file).unwrap_or(false)
4295                                                    } else {
4296                                                        false
4297                                                    };
4298
4299                                                    if matches {
4300                                                        let project_path =
4301                                                            (snapshot.id(), entry.path.clone());
4302                                                        if matching_paths_tx
4303                                                            .send(project_path)
4304                                                            .await
4305                                                            .is_err()
4306                                                        {
4307                                                            break;
4308                                                        }
4309                                                    }
4310                                                }
4311
4312                                                snapshot_start_ix = snapshot_end_ix;
4313                                            }
4314                                        }
4315                                    });
4316                                }
4317                            })
4318                            .await;
4319                    }
4320                })
4321                .detach();
4322
4323            let (buffers_tx, buffers_rx) = smol::channel::bounded(1024);
4324            let open_buffers = self
4325                .opened_buffers
4326                .values()
4327                .filter_map(|b| b.upgrade(cx))
4328                .collect::<HashSet<_>>();
4329            cx.spawn(|this, cx| async move {
4330                for buffer in &open_buffers {
4331                    let snapshot = buffer.read_with(&cx, |buffer, _| buffer.snapshot());
4332                    buffers_tx.send((buffer.clone(), snapshot)).await?;
4333                }
4334
4335                let open_buffers = Rc::new(RefCell::new(open_buffers));
4336                while let Some(project_path) = matching_paths_rx.next().await {
4337                    if buffers_tx.is_closed() {
4338                        break;
4339                    }
4340
4341                    let this = this.clone();
4342                    let open_buffers = open_buffers.clone();
4343                    let buffers_tx = buffers_tx.clone();
4344                    cx.spawn(|mut cx| async move {
4345                        if let Some(buffer) = this
4346                            .update(&mut cx, |this, cx| this.open_buffer(project_path, cx))
4347                            .await
4348                            .log_err()
4349                        {
4350                            if open_buffers.borrow_mut().insert(buffer.clone()) {
4351                                let snapshot = buffer.read_with(&cx, |buffer, _| buffer.snapshot());
4352                                buffers_tx.send((buffer, snapshot)).await?;
4353                            }
4354                        }
4355
4356                        Ok::<_, anyhow::Error>(())
4357                    })
4358                    .detach();
4359                }
4360
4361                Ok::<_, anyhow::Error>(())
4362            })
4363            .detach_and_log_err(cx);
4364
4365            let background = cx.background().clone();
4366            cx.background().spawn(async move {
4367                let query = &query;
4368                let mut matched_buffers = Vec::new();
4369                for _ in 0..workers {
4370                    matched_buffers.push(HashMap::default());
4371                }
4372                background
4373                    .scoped(|scope| {
4374                        for worker_matched_buffers in matched_buffers.iter_mut() {
4375                            let mut buffers_rx = buffers_rx.clone();
4376                            scope.spawn(async move {
4377                                while let Some((buffer, snapshot)) = buffers_rx.next().await {
4378                                    let buffer_matches = query
4379                                        .search(snapshot.as_rope())
4380                                        .await
4381                                        .iter()
4382                                        .map(|range| {
4383                                            snapshot.anchor_before(range.start)
4384                                                ..snapshot.anchor_after(range.end)
4385                                        })
4386                                        .collect::<Vec<_>>();
4387                                    if !buffer_matches.is_empty() {
4388                                        worker_matched_buffers
4389                                            .insert(buffer.clone(), buffer_matches);
4390                                    }
4391                                }
4392                            });
4393                        }
4394                    })
4395                    .await;
4396                Ok(matched_buffers.into_iter().flatten().collect())
4397            })
4398        } else if let Some(project_id) = self.remote_id() {
4399            let request = self.client.request(query.to_proto(project_id));
4400            cx.spawn(|this, mut cx| async move {
4401                let response = request.await?;
4402                let mut result = HashMap::default();
4403                for location in response.locations {
4404                    let target_buffer = this
4405                        .update(&mut cx, |this, cx| {
4406                            this.wait_for_remote_buffer(location.buffer_id, cx)
4407                        })
4408                        .await?;
4409                    let start = location
4410                        .start
4411                        .and_then(deserialize_anchor)
4412                        .ok_or_else(|| anyhow!("missing target start"))?;
4413                    let end = location
4414                        .end
4415                        .and_then(deserialize_anchor)
4416                        .ok_or_else(|| anyhow!("missing target end"))?;
4417                    result
4418                        .entry(target_buffer)
4419                        .or_insert(Vec::new())
4420                        .push(start..end)
4421                }
4422                Ok(result)
4423            })
4424        } else {
4425            Task::ready(Ok(Default::default()))
4426        }
4427    }
4428
4429    fn request_lsp<R: LspCommand>(
4430        &self,
4431        buffer_handle: ModelHandle<Buffer>,
4432        request: R,
4433        cx: &mut ModelContext<Self>,
4434    ) -> Task<Result<R::Response>>
4435    where
4436        <R::LspRequest as lsp::request::Request>::Result: Send,
4437    {
4438        let buffer = buffer_handle.read(cx);
4439        if self.is_local() {
4440            let file = File::from_dyn(buffer.file()).and_then(File::as_local);
4441            if let Some((file, language_server)) = file.zip(
4442                self.language_server_for_buffer(buffer, cx)
4443                    .map(|(_, server)| server.clone()),
4444            ) {
4445                let lsp_params = request.to_lsp(&file.abs_path(cx), cx);
4446                return cx.spawn(|this, cx| async move {
4447                    if !request.check_capabilities(language_server.capabilities()) {
4448                        return Ok(Default::default());
4449                    }
4450
4451                    let response = language_server
4452                        .request::<R::LspRequest>(lsp_params)
4453                        .await
4454                        .context("lsp request failed")?;
4455                    request
4456                        .response_from_lsp(response, this, buffer_handle, cx)
4457                        .await
4458                });
4459            }
4460        } else if let Some(project_id) = self.remote_id() {
4461            let rpc = self.client.clone();
4462            let message = request.to_proto(project_id, buffer);
4463            return cx.spawn_weak(|this, cx| async move {
4464                let response = rpc.request(message).await?;
4465                let this = this
4466                    .upgrade(&cx)
4467                    .ok_or_else(|| anyhow!("project dropped"))?;
4468                if this.read_with(&cx, |this, _| this.is_read_only()) {
4469                    Err(anyhow!("disconnected before completing request"))
4470                } else {
4471                    request
4472                        .response_from_proto(response, this, buffer_handle, cx)
4473                        .await
4474                }
4475            });
4476        }
4477        Task::ready(Ok(Default::default()))
4478    }
4479
4480    pub fn find_or_create_local_worktree(
4481        &mut self,
4482        abs_path: impl AsRef<Path>,
4483        visible: bool,
4484        cx: &mut ModelContext<Self>,
4485    ) -> Task<Result<(ModelHandle<Worktree>, PathBuf)>> {
4486        let abs_path = abs_path.as_ref();
4487        if let Some((tree, relative_path)) = self.find_local_worktree(abs_path, cx) {
4488            Task::ready(Ok((tree, relative_path)))
4489        } else {
4490            let worktree = self.create_local_worktree(abs_path, visible, cx);
4491            cx.foreground()
4492                .spawn(async move { Ok((worktree.await?, PathBuf::new())) })
4493        }
4494    }
4495
4496    pub fn find_local_worktree(
4497        &self,
4498        abs_path: &Path,
4499        cx: &AppContext,
4500    ) -> Option<(ModelHandle<Worktree>, PathBuf)> {
4501        for tree in &self.worktrees {
4502            if let Some(tree) = tree.upgrade(cx) {
4503                if let Some(relative_path) = tree
4504                    .read(cx)
4505                    .as_local()
4506                    .and_then(|t| abs_path.strip_prefix(t.abs_path()).ok())
4507                {
4508                    return Some((tree.clone(), relative_path.into()));
4509                }
4510            }
4511        }
4512        None
4513    }
4514
4515    pub fn is_shared(&self) -> bool {
4516        match &self.client_state {
4517            Some(ProjectClientState::Local { .. }) => true,
4518            _ => false,
4519        }
4520    }
4521
4522    fn create_local_worktree(
4523        &mut self,
4524        abs_path: impl AsRef<Path>,
4525        visible: bool,
4526        cx: &mut ModelContext<Self>,
4527    ) -> Task<Result<ModelHandle<Worktree>>> {
4528        let fs = self.fs.clone();
4529        let client = self.client.clone();
4530        let next_entry_id = self.next_entry_id.clone();
4531        let path: Arc<Path> = abs_path.as_ref().into();
4532        let task = self
4533            .loading_local_worktrees
4534            .entry(path.clone())
4535            .or_insert_with(|| {
4536                cx.spawn(|project, mut cx| {
4537                    async move {
4538                        let worktree = Worktree::local(
4539                            client.clone(),
4540                            path.clone(),
4541                            visible,
4542                            fs,
4543                            next_entry_id,
4544                            &mut cx,
4545                        )
4546                        .await;
4547
4548                        project.update(&mut cx, |project, _| {
4549                            project.loading_local_worktrees.remove(&path);
4550                        });
4551
4552                        let worktree = worktree?;
4553                        project.update(&mut cx, |project, cx| project.add_worktree(&worktree, cx));
4554                        Ok(worktree)
4555                    }
4556                    .map_err(Arc::new)
4557                })
4558                .shared()
4559            })
4560            .clone();
4561        cx.foreground().spawn(async move {
4562            match task.await {
4563                Ok(worktree) => Ok(worktree),
4564                Err(err) => Err(anyhow!("{}", err)),
4565            }
4566        })
4567    }
4568
4569    pub fn remove_worktree(&mut self, id_to_remove: WorktreeId, cx: &mut ModelContext<Self>) {
4570        self.worktrees.retain(|worktree| {
4571            if let Some(worktree) = worktree.upgrade(cx) {
4572                let id = worktree.read(cx).id();
4573                if id == id_to_remove {
4574                    cx.emit(Event::WorktreeRemoved(id));
4575                    false
4576                } else {
4577                    true
4578                }
4579            } else {
4580                false
4581            }
4582        });
4583        self.metadata_changed(cx);
4584    }
4585
4586    fn add_worktree(&mut self, worktree: &ModelHandle<Worktree>, cx: &mut ModelContext<Self>) {
4587        cx.observe(worktree, |_, _, cx| cx.notify()).detach();
4588        if worktree.read(cx).is_local() {
4589            cx.subscribe(worktree, |this, worktree, event, cx| match event {
4590                worktree::Event::UpdatedEntries(changes) => {
4591                    this.update_local_worktree_buffers(&worktree, cx);
4592                    this.update_local_worktree_language_servers(&worktree, changes, cx);
4593                }
4594                worktree::Event::UpdatedGitRepositories(updated_repos) => {
4595                    this.update_local_worktree_buffers_git_repos(worktree, updated_repos, cx)
4596                }
4597            })
4598            .detach();
4599        }
4600
4601        let push_strong_handle = {
4602            let worktree = worktree.read(cx);
4603            self.is_shared() || worktree.is_visible() || worktree.is_remote()
4604        };
4605        if push_strong_handle {
4606            self.worktrees
4607                .push(WorktreeHandle::Strong(worktree.clone()));
4608        } else {
4609            self.worktrees
4610                .push(WorktreeHandle::Weak(worktree.downgrade()));
4611        }
4612
4613        cx.observe_release(worktree, |this, worktree, cx| {
4614            let _ = this.remove_worktree(worktree.id(), cx);
4615        })
4616        .detach();
4617
4618        cx.emit(Event::WorktreeAdded);
4619        self.metadata_changed(cx);
4620    }
4621
4622    fn update_local_worktree_buffers(
4623        &mut self,
4624        worktree_handle: &ModelHandle<Worktree>,
4625        cx: &mut ModelContext<Self>,
4626    ) {
4627        let snapshot = worktree_handle.read(cx).snapshot();
4628        let mut buffers_to_delete = Vec::new();
4629        let mut renamed_buffers = Vec::new();
4630        for (buffer_id, buffer) in &self.opened_buffers {
4631            if let Some(buffer) = buffer.upgrade(cx) {
4632                buffer.update(cx, |buffer, cx| {
4633                    if let Some(old_file) = File::from_dyn(buffer.file()) {
4634                        if old_file.worktree != *worktree_handle {
4635                            return;
4636                        }
4637
4638                        let new_file = if let Some(entry) = snapshot.entry_for_id(old_file.entry_id)
4639                        {
4640                            File {
4641                                is_local: true,
4642                                entry_id: entry.id,
4643                                mtime: entry.mtime,
4644                                path: entry.path.clone(),
4645                                worktree: worktree_handle.clone(),
4646                                is_deleted: false,
4647                            }
4648                        } else if let Some(entry) =
4649                            snapshot.entry_for_path(old_file.path().as_ref())
4650                        {
4651                            File {
4652                                is_local: true,
4653                                entry_id: entry.id,
4654                                mtime: entry.mtime,
4655                                path: entry.path.clone(),
4656                                worktree: worktree_handle.clone(),
4657                                is_deleted: false,
4658                            }
4659                        } else {
4660                            File {
4661                                is_local: true,
4662                                entry_id: old_file.entry_id,
4663                                path: old_file.path().clone(),
4664                                mtime: old_file.mtime(),
4665                                worktree: worktree_handle.clone(),
4666                                is_deleted: true,
4667                            }
4668                        };
4669
4670                        let old_path = old_file.abs_path(cx);
4671                        if new_file.abs_path(cx) != old_path {
4672                            renamed_buffers.push((cx.handle(), old_path));
4673                        }
4674
4675                        if new_file != *old_file {
4676                            if let Some(project_id) = self.remote_id() {
4677                                self.client
4678                                    .send(proto::UpdateBufferFile {
4679                                        project_id,
4680                                        buffer_id: *buffer_id as u64,
4681                                        file: Some(new_file.to_proto()),
4682                                    })
4683                                    .log_err();
4684                            }
4685
4686                            buffer.file_updated(Arc::new(new_file), cx).detach();
4687                        }
4688                    }
4689                });
4690            } else {
4691                buffers_to_delete.push(*buffer_id);
4692            }
4693        }
4694
4695        for buffer_id in buffers_to_delete {
4696            self.opened_buffers.remove(&buffer_id);
4697        }
4698
4699        for (buffer, old_path) in renamed_buffers {
4700            self.unregister_buffer_from_language_server(&buffer, old_path, cx);
4701            self.detect_language_for_buffer(&buffer, cx);
4702            self.register_buffer_with_language_server(&buffer, cx);
4703        }
4704    }
4705
4706    fn update_local_worktree_language_servers(
4707        &mut self,
4708        worktree_handle: &ModelHandle<Worktree>,
4709        changes: &HashMap<Arc<Path>, PathChange>,
4710        cx: &mut ModelContext<Self>,
4711    ) {
4712        let worktree_id = worktree_handle.read(cx).id();
4713        let abs_path = worktree_handle.read(cx).abs_path();
4714        for ((server_worktree_id, _), server_id) in &self.language_server_ids {
4715            if *server_worktree_id == worktree_id {
4716                if let Some(server) = self.language_servers.get(server_id) {
4717                    if let LanguageServerState::Running {
4718                        server,
4719                        watched_paths,
4720                        ..
4721                    } = server
4722                    {
4723                        let params = lsp::DidChangeWatchedFilesParams {
4724                            changes: changes
4725                                .iter()
4726                                .filter_map(|(path, change)| {
4727                                    let path = abs_path.join(path);
4728                                    if watched_paths.matches(&path) {
4729                                        Some(lsp::FileEvent {
4730                                            uri: lsp::Url::from_file_path(path).unwrap(),
4731                                            typ: match change {
4732                                                PathChange::Added => lsp::FileChangeType::CREATED,
4733                                                PathChange::Removed => lsp::FileChangeType::DELETED,
4734                                                PathChange::Updated
4735                                                | PathChange::AddedOrUpdated => {
4736                                                    lsp::FileChangeType::CHANGED
4737                                                }
4738                                            },
4739                                        })
4740                                    } else {
4741                                        None
4742                                    }
4743                                })
4744                                .collect(),
4745                        };
4746
4747                        if !params.changes.is_empty() {
4748                            server
4749                                .notify::<lsp::notification::DidChangeWatchedFiles>(params)
4750                                .log_err();
4751                        }
4752                    }
4753                }
4754            }
4755        }
4756    }
4757
4758    fn update_local_worktree_buffers_git_repos(
4759        &mut self,
4760        worktree: ModelHandle<Worktree>,
4761        repos: &[GitRepositoryEntry],
4762        cx: &mut ModelContext<Self>,
4763    ) {
4764        for (_, buffer) in &self.opened_buffers {
4765            if let Some(buffer) = buffer.upgrade(cx) {
4766                let file = match File::from_dyn(buffer.read(cx).file()) {
4767                    Some(file) => file,
4768                    None => continue,
4769                };
4770                if file.worktree != worktree {
4771                    continue;
4772                }
4773
4774                let path = file.path().clone();
4775
4776                let repo = match repos.iter().find(|repo| repo.manages(&path)) {
4777                    Some(repo) => repo.clone(),
4778                    None => return,
4779                };
4780
4781                let relative_repo = match path.strip_prefix(repo.content_path) {
4782                    Ok(relative_repo) => relative_repo.to_owned(),
4783                    Err(_) => return,
4784                };
4785
4786                let remote_id = self.remote_id();
4787                let client = self.client.clone();
4788
4789                cx.spawn(|_, mut cx| async move {
4790                    let diff_base = cx
4791                        .background()
4792                        .spawn(async move { repo.repo.lock().load_index_text(&relative_repo) })
4793                        .await;
4794
4795                    let buffer_id = buffer.update(&mut cx, |buffer, cx| {
4796                        buffer.set_diff_base(diff_base.clone(), cx);
4797                        buffer.remote_id()
4798                    });
4799
4800                    if let Some(project_id) = remote_id {
4801                        client
4802                            .send(proto::UpdateDiffBase {
4803                                project_id,
4804                                buffer_id: buffer_id as u64,
4805                                diff_base,
4806                            })
4807                            .log_err();
4808                    }
4809                })
4810                .detach();
4811            }
4812        }
4813    }
4814
4815    pub fn set_active_path(&mut self, entry: Option<ProjectPath>, cx: &mut ModelContext<Self>) {
4816        let new_active_entry = entry.and_then(|project_path| {
4817            let worktree = self.worktree_for_id(project_path.worktree_id, cx)?;
4818            let entry = worktree.read(cx).entry_for_path(project_path.path)?;
4819            Some(entry.id)
4820        });
4821        if new_active_entry != self.active_entry {
4822            self.active_entry = new_active_entry;
4823            cx.emit(Event::ActiveEntryChanged(new_active_entry));
4824        }
4825    }
4826
4827    pub fn language_servers_running_disk_based_diagnostics(
4828        &self,
4829    ) -> impl Iterator<Item = usize> + '_ {
4830        self.language_server_statuses
4831            .iter()
4832            .filter_map(|(id, status)| {
4833                if status.has_pending_diagnostic_updates {
4834                    Some(*id)
4835                } else {
4836                    None
4837                }
4838            })
4839    }
4840
4841    pub fn diagnostic_summary(&self, cx: &AppContext) -> DiagnosticSummary {
4842        let mut summary = DiagnosticSummary::default();
4843        for (_, path_summary) in self.diagnostic_summaries(cx) {
4844            summary.error_count += path_summary.error_count;
4845            summary.warning_count += path_summary.warning_count;
4846        }
4847        summary
4848    }
4849
4850    pub fn diagnostic_summaries<'a>(
4851        &'a self,
4852        cx: &'a AppContext,
4853    ) -> impl Iterator<Item = (ProjectPath, DiagnosticSummary)> + 'a {
4854        self.visible_worktrees(cx).flat_map(move |worktree| {
4855            let worktree = worktree.read(cx);
4856            let worktree_id = worktree.id();
4857            worktree
4858                .diagnostic_summaries()
4859                .map(move |(path, summary)| (ProjectPath { worktree_id, path }, summary))
4860        })
4861    }
4862
4863    pub fn disk_based_diagnostics_started(
4864        &mut self,
4865        language_server_id: usize,
4866        cx: &mut ModelContext<Self>,
4867    ) {
4868        cx.emit(Event::DiskBasedDiagnosticsStarted { language_server_id });
4869    }
4870
4871    pub fn disk_based_diagnostics_finished(
4872        &mut self,
4873        language_server_id: usize,
4874        cx: &mut ModelContext<Self>,
4875    ) {
4876        cx.emit(Event::DiskBasedDiagnosticsFinished { language_server_id });
4877    }
4878
4879    pub fn active_entry(&self) -> Option<ProjectEntryId> {
4880        self.active_entry
4881    }
4882
4883    pub fn entry_for_path(&self, path: &ProjectPath, cx: &AppContext) -> Option<Entry> {
4884        self.worktree_for_id(path.worktree_id, cx)?
4885            .read(cx)
4886            .entry_for_path(&path.path)
4887            .cloned()
4888    }
4889
4890    pub fn path_for_entry(&self, entry_id: ProjectEntryId, cx: &AppContext) -> Option<ProjectPath> {
4891        let worktree = self.worktree_for_entry(entry_id, cx)?;
4892        let worktree = worktree.read(cx);
4893        let worktree_id = worktree.id();
4894        let path = worktree.entry_for_id(entry_id)?.path.clone();
4895        Some(ProjectPath { worktree_id, path })
4896    }
4897
4898    // RPC message handlers
4899
4900    async fn handle_unshare_project(
4901        this: ModelHandle<Self>,
4902        _: TypedEnvelope<proto::UnshareProject>,
4903        _: Arc<Client>,
4904        mut cx: AsyncAppContext,
4905    ) -> Result<()> {
4906        this.update(&mut cx, |this, cx| {
4907            if this.is_local() {
4908                this.unshare(cx)?;
4909            } else {
4910                this.disconnected_from_host(cx);
4911            }
4912            Ok(())
4913        })
4914    }
4915
4916    async fn handle_add_collaborator(
4917        this: ModelHandle<Self>,
4918        mut envelope: TypedEnvelope<proto::AddProjectCollaborator>,
4919        _: Arc<Client>,
4920        mut cx: AsyncAppContext,
4921    ) -> Result<()> {
4922        let collaborator = envelope
4923            .payload
4924            .collaborator
4925            .take()
4926            .ok_or_else(|| anyhow!("empty collaborator"))?;
4927
4928        let collaborator = Collaborator::from_proto(collaborator)?;
4929        this.update(&mut cx, |this, cx| {
4930            this.shared_buffers.remove(&collaborator.peer_id);
4931            this.collaborators
4932                .insert(collaborator.peer_id, collaborator);
4933            cx.notify();
4934        });
4935
4936        Ok(())
4937    }
4938
4939    async fn handle_update_project_collaborator(
4940        this: ModelHandle<Self>,
4941        envelope: TypedEnvelope<proto::UpdateProjectCollaborator>,
4942        _: Arc<Client>,
4943        mut cx: AsyncAppContext,
4944    ) -> Result<()> {
4945        let old_peer_id = envelope
4946            .payload
4947            .old_peer_id
4948            .ok_or_else(|| anyhow!("missing old peer id"))?;
4949        let new_peer_id = envelope
4950            .payload
4951            .new_peer_id
4952            .ok_or_else(|| anyhow!("missing new peer id"))?;
4953        this.update(&mut cx, |this, cx| {
4954            let collaborator = this
4955                .collaborators
4956                .remove(&old_peer_id)
4957                .ok_or_else(|| anyhow!("received UpdateProjectCollaborator for unknown peer"))?;
4958            let is_host = collaborator.replica_id == 0;
4959            this.collaborators.insert(new_peer_id, collaborator);
4960
4961            let buffers = this.shared_buffers.remove(&old_peer_id);
4962            log::info!(
4963                "peer {} became {}. moving buffers {:?}",
4964                old_peer_id,
4965                new_peer_id,
4966                &buffers
4967            );
4968            if let Some(buffers) = buffers {
4969                this.shared_buffers.insert(new_peer_id, buffers);
4970            }
4971
4972            if is_host {
4973                this.buffer_changes_tx
4974                    .unbounded_send(BufferMessage::Resync)
4975                    .unwrap();
4976            }
4977
4978            cx.emit(Event::CollaboratorUpdated {
4979                old_peer_id,
4980                new_peer_id,
4981            });
4982            cx.notify();
4983            Ok(())
4984        })
4985    }
4986
4987    async fn handle_remove_collaborator(
4988        this: ModelHandle<Self>,
4989        envelope: TypedEnvelope<proto::RemoveProjectCollaborator>,
4990        _: Arc<Client>,
4991        mut cx: AsyncAppContext,
4992    ) -> Result<()> {
4993        this.update(&mut cx, |this, cx| {
4994            let peer_id = envelope
4995                .payload
4996                .peer_id
4997                .ok_or_else(|| anyhow!("invalid peer id"))?;
4998            let replica_id = this
4999                .collaborators
5000                .remove(&peer_id)
5001                .ok_or_else(|| anyhow!("unknown peer {:?}", peer_id))?
5002                .replica_id;
5003            for buffer in this.opened_buffers.values() {
5004                if let Some(buffer) = buffer.upgrade(cx) {
5005                    buffer.update(cx, |buffer, cx| buffer.remove_peer(replica_id, cx));
5006                }
5007            }
5008            this.shared_buffers.remove(&peer_id);
5009
5010            cx.emit(Event::CollaboratorLeft(peer_id));
5011            cx.notify();
5012            Ok(())
5013        })
5014    }
5015
5016    async fn handle_update_project(
5017        this: ModelHandle<Self>,
5018        envelope: TypedEnvelope<proto::UpdateProject>,
5019        _: Arc<Client>,
5020        mut cx: AsyncAppContext,
5021    ) -> Result<()> {
5022        this.update(&mut cx, |this, cx| {
5023            // Don't handle messages that were sent before the response to us joining the project
5024            if envelope.message_id > this.join_project_response_message_id {
5025                this.set_worktrees_from_proto(envelope.payload.worktrees, cx)?;
5026            }
5027            Ok(())
5028        })
5029    }
5030
5031    async fn handle_update_worktree(
5032        this: ModelHandle<Self>,
5033        envelope: TypedEnvelope<proto::UpdateWorktree>,
5034        _: Arc<Client>,
5035        mut cx: AsyncAppContext,
5036    ) -> Result<()> {
5037        this.update(&mut cx, |this, cx| {
5038            let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
5039            if let Some(worktree) = this.worktree_for_id(worktree_id, cx) {
5040                worktree.update(cx, |worktree, _| {
5041                    let worktree = worktree.as_remote_mut().unwrap();
5042                    worktree.update_from_remote(envelope.payload);
5043                });
5044            }
5045            Ok(())
5046        })
5047    }
5048
5049    async fn handle_create_project_entry(
5050        this: ModelHandle<Self>,
5051        envelope: TypedEnvelope<proto::CreateProjectEntry>,
5052        _: Arc<Client>,
5053        mut cx: AsyncAppContext,
5054    ) -> Result<proto::ProjectEntryResponse> {
5055        let worktree = this.update(&mut cx, |this, cx| {
5056            let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
5057            this.worktree_for_id(worktree_id, cx)
5058                .ok_or_else(|| anyhow!("worktree not found"))
5059        })?;
5060        let worktree_scan_id = worktree.read_with(&cx, |worktree, _| worktree.scan_id());
5061        let entry = worktree
5062            .update(&mut cx, |worktree, cx| {
5063                let worktree = worktree.as_local_mut().unwrap();
5064                let path = PathBuf::from(envelope.payload.path);
5065                worktree.create_entry(path, envelope.payload.is_directory, cx)
5066            })
5067            .await?;
5068        Ok(proto::ProjectEntryResponse {
5069            entry: Some((&entry).into()),
5070            worktree_scan_id: worktree_scan_id as u64,
5071        })
5072    }
5073
5074    async fn handle_rename_project_entry(
5075        this: ModelHandle<Self>,
5076        envelope: TypedEnvelope<proto::RenameProjectEntry>,
5077        _: Arc<Client>,
5078        mut cx: AsyncAppContext,
5079    ) -> Result<proto::ProjectEntryResponse> {
5080        let entry_id = ProjectEntryId::from_proto(envelope.payload.entry_id);
5081        let worktree = this.read_with(&cx, |this, cx| {
5082            this.worktree_for_entry(entry_id, cx)
5083                .ok_or_else(|| anyhow!("worktree not found"))
5084        })?;
5085        let worktree_scan_id = worktree.read_with(&cx, |worktree, _| worktree.scan_id());
5086        let entry = worktree
5087            .update(&mut cx, |worktree, cx| {
5088                let new_path = PathBuf::from(envelope.payload.new_path);
5089                worktree
5090                    .as_local_mut()
5091                    .unwrap()
5092                    .rename_entry(entry_id, new_path, cx)
5093                    .ok_or_else(|| anyhow!("invalid entry"))
5094            })?
5095            .await?;
5096        Ok(proto::ProjectEntryResponse {
5097            entry: Some((&entry).into()),
5098            worktree_scan_id: worktree_scan_id as u64,
5099        })
5100    }
5101
5102    async fn handle_copy_project_entry(
5103        this: ModelHandle<Self>,
5104        envelope: TypedEnvelope<proto::CopyProjectEntry>,
5105        _: Arc<Client>,
5106        mut cx: AsyncAppContext,
5107    ) -> Result<proto::ProjectEntryResponse> {
5108        let entry_id = ProjectEntryId::from_proto(envelope.payload.entry_id);
5109        let worktree = this.read_with(&cx, |this, cx| {
5110            this.worktree_for_entry(entry_id, cx)
5111                .ok_or_else(|| anyhow!("worktree not found"))
5112        })?;
5113        let worktree_scan_id = worktree.read_with(&cx, |worktree, _| worktree.scan_id());
5114        let entry = worktree
5115            .update(&mut cx, |worktree, cx| {
5116                let new_path = PathBuf::from(envelope.payload.new_path);
5117                worktree
5118                    .as_local_mut()
5119                    .unwrap()
5120                    .copy_entry(entry_id, new_path, cx)
5121                    .ok_or_else(|| anyhow!("invalid entry"))
5122            })?
5123            .await?;
5124        Ok(proto::ProjectEntryResponse {
5125            entry: Some((&entry).into()),
5126            worktree_scan_id: worktree_scan_id as u64,
5127        })
5128    }
5129
5130    async fn handle_delete_project_entry(
5131        this: ModelHandle<Self>,
5132        envelope: TypedEnvelope<proto::DeleteProjectEntry>,
5133        _: Arc<Client>,
5134        mut cx: AsyncAppContext,
5135    ) -> Result<proto::ProjectEntryResponse> {
5136        let entry_id = ProjectEntryId::from_proto(envelope.payload.entry_id);
5137        let worktree = this.read_with(&cx, |this, cx| {
5138            this.worktree_for_entry(entry_id, cx)
5139                .ok_or_else(|| anyhow!("worktree not found"))
5140        })?;
5141        let worktree_scan_id = worktree.read_with(&cx, |worktree, _| worktree.scan_id());
5142        worktree
5143            .update(&mut cx, |worktree, cx| {
5144                worktree
5145                    .as_local_mut()
5146                    .unwrap()
5147                    .delete_entry(entry_id, cx)
5148                    .ok_or_else(|| anyhow!("invalid entry"))
5149            })?
5150            .await?;
5151        Ok(proto::ProjectEntryResponse {
5152            entry: None,
5153            worktree_scan_id: worktree_scan_id as u64,
5154        })
5155    }
5156
5157    async fn handle_update_diagnostic_summary(
5158        this: ModelHandle<Self>,
5159        envelope: TypedEnvelope<proto::UpdateDiagnosticSummary>,
5160        _: Arc<Client>,
5161        mut cx: AsyncAppContext,
5162    ) -> Result<()> {
5163        this.update(&mut cx, |this, cx| {
5164            let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
5165            if let Some(worktree) = this.worktree_for_id(worktree_id, cx) {
5166                if let Some(summary) = envelope.payload.summary {
5167                    let project_path = ProjectPath {
5168                        worktree_id,
5169                        path: Path::new(&summary.path).into(),
5170                    };
5171                    worktree.update(cx, |worktree, _| {
5172                        worktree
5173                            .as_remote_mut()
5174                            .unwrap()
5175                            .update_diagnostic_summary(project_path.path.clone(), &summary);
5176                    });
5177                    cx.emit(Event::DiagnosticsUpdated {
5178                        language_server_id: summary.language_server_id as usize,
5179                        path: project_path,
5180                    });
5181                }
5182            }
5183            Ok(())
5184        })
5185    }
5186
5187    async fn handle_start_language_server(
5188        this: ModelHandle<Self>,
5189        envelope: TypedEnvelope<proto::StartLanguageServer>,
5190        _: Arc<Client>,
5191        mut cx: AsyncAppContext,
5192    ) -> Result<()> {
5193        let server = envelope
5194            .payload
5195            .server
5196            .ok_or_else(|| anyhow!("invalid server"))?;
5197        this.update(&mut cx, |this, cx| {
5198            this.language_server_statuses.insert(
5199                server.id as usize,
5200                LanguageServerStatus {
5201                    name: server.name,
5202                    pending_work: Default::default(),
5203                    has_pending_diagnostic_updates: false,
5204                    progress_tokens: Default::default(),
5205                },
5206            );
5207            cx.notify();
5208        });
5209        Ok(())
5210    }
5211
5212    async fn handle_update_language_server(
5213        this: ModelHandle<Self>,
5214        envelope: TypedEnvelope<proto::UpdateLanguageServer>,
5215        _: Arc<Client>,
5216        mut cx: AsyncAppContext,
5217    ) -> Result<()> {
5218        this.update(&mut cx, |this, cx| {
5219            let language_server_id = envelope.payload.language_server_id as usize;
5220
5221            match envelope
5222                .payload
5223                .variant
5224                .ok_or_else(|| anyhow!("invalid variant"))?
5225            {
5226                proto::update_language_server::Variant::WorkStart(payload) => {
5227                    this.on_lsp_work_start(
5228                        language_server_id,
5229                        payload.token,
5230                        LanguageServerProgress {
5231                            message: payload.message,
5232                            percentage: payload.percentage.map(|p| p as usize),
5233                            last_update_at: Instant::now(),
5234                        },
5235                        cx,
5236                    );
5237                }
5238
5239                proto::update_language_server::Variant::WorkProgress(payload) => {
5240                    this.on_lsp_work_progress(
5241                        language_server_id,
5242                        payload.token,
5243                        LanguageServerProgress {
5244                            message: payload.message,
5245                            percentage: payload.percentage.map(|p| p as usize),
5246                            last_update_at: Instant::now(),
5247                        },
5248                        cx,
5249                    );
5250                }
5251
5252                proto::update_language_server::Variant::WorkEnd(payload) => {
5253                    this.on_lsp_work_end(language_server_id, payload.token, cx);
5254                }
5255
5256                proto::update_language_server::Variant::DiskBasedDiagnosticsUpdating(_) => {
5257                    this.disk_based_diagnostics_started(language_server_id, cx);
5258                }
5259
5260                proto::update_language_server::Variant::DiskBasedDiagnosticsUpdated(_) => {
5261                    this.disk_based_diagnostics_finished(language_server_id, cx)
5262                }
5263            }
5264
5265            Ok(())
5266        })
5267    }
5268
5269    async fn handle_update_buffer(
5270        this: ModelHandle<Self>,
5271        envelope: TypedEnvelope<proto::UpdateBuffer>,
5272        _: Arc<Client>,
5273        mut cx: AsyncAppContext,
5274    ) -> Result<proto::Ack> {
5275        this.update(&mut cx, |this, cx| {
5276            let payload = envelope.payload.clone();
5277            let buffer_id = payload.buffer_id;
5278            let ops = payload
5279                .operations
5280                .into_iter()
5281                .map(language::proto::deserialize_operation)
5282                .collect::<Result<Vec<_>, _>>()?;
5283            let is_remote = this.is_remote();
5284            match this.opened_buffers.entry(buffer_id) {
5285                hash_map::Entry::Occupied(mut e) => match e.get_mut() {
5286                    OpenBuffer::Strong(buffer) => {
5287                        buffer.update(cx, |buffer, cx| buffer.apply_ops(ops, cx))?;
5288                    }
5289                    OpenBuffer::Operations(operations) => operations.extend_from_slice(&ops),
5290                    OpenBuffer::Weak(_) => {}
5291                },
5292                hash_map::Entry::Vacant(e) => {
5293                    assert!(
5294                        is_remote,
5295                        "received buffer update from {:?}",
5296                        envelope.original_sender_id
5297                    );
5298                    e.insert(OpenBuffer::Operations(ops));
5299                }
5300            }
5301            Ok(proto::Ack {})
5302        })
5303    }
5304
5305    async fn handle_create_buffer_for_peer(
5306        this: ModelHandle<Self>,
5307        envelope: TypedEnvelope<proto::CreateBufferForPeer>,
5308        _: Arc<Client>,
5309        mut cx: AsyncAppContext,
5310    ) -> Result<()> {
5311        this.update(&mut cx, |this, cx| {
5312            match envelope
5313                .payload
5314                .variant
5315                .ok_or_else(|| anyhow!("missing variant"))?
5316            {
5317                proto::create_buffer_for_peer::Variant::State(mut state) => {
5318                    let mut buffer_file = None;
5319                    if let Some(file) = state.file.take() {
5320                        let worktree_id = WorktreeId::from_proto(file.worktree_id);
5321                        let worktree = this.worktree_for_id(worktree_id, cx).ok_or_else(|| {
5322                            anyhow!("no worktree found for id {}", file.worktree_id)
5323                        })?;
5324                        buffer_file = Some(Arc::new(File::from_proto(file, worktree.clone(), cx)?)
5325                            as Arc<dyn language::File>);
5326                    }
5327
5328                    let buffer_id = state.id;
5329                    let buffer = cx.add_model(|_| {
5330                        Buffer::from_proto(this.replica_id(), state, buffer_file).unwrap()
5331                    });
5332                    this.incomplete_remote_buffers
5333                        .insert(buffer_id, Some(buffer));
5334                }
5335                proto::create_buffer_for_peer::Variant::Chunk(chunk) => {
5336                    let buffer = this
5337                        .incomplete_remote_buffers
5338                        .get(&chunk.buffer_id)
5339                        .cloned()
5340                        .flatten()
5341                        .ok_or_else(|| {
5342                            anyhow!(
5343                                "received chunk for buffer {} without initial state",
5344                                chunk.buffer_id
5345                            )
5346                        })?;
5347                    let operations = chunk
5348                        .operations
5349                        .into_iter()
5350                        .map(language::proto::deserialize_operation)
5351                        .collect::<Result<Vec<_>>>()?;
5352                    buffer.update(cx, |buffer, cx| buffer.apply_ops(operations, cx))?;
5353
5354                    if chunk.is_last {
5355                        this.incomplete_remote_buffers.remove(&chunk.buffer_id);
5356                        this.register_buffer(&buffer, cx)?;
5357                    }
5358                }
5359            }
5360
5361            Ok(())
5362        })
5363    }
5364
5365    async fn handle_update_diff_base(
5366        this: ModelHandle<Self>,
5367        envelope: TypedEnvelope<proto::UpdateDiffBase>,
5368        _: Arc<Client>,
5369        mut cx: AsyncAppContext,
5370    ) -> Result<()> {
5371        this.update(&mut cx, |this, cx| {
5372            let buffer_id = envelope.payload.buffer_id;
5373            let diff_base = envelope.payload.diff_base;
5374            if let Some(buffer) = this
5375                .opened_buffers
5376                .get_mut(&buffer_id)
5377                .and_then(|b| b.upgrade(cx))
5378                .or_else(|| {
5379                    this.incomplete_remote_buffers
5380                        .get(&buffer_id)
5381                        .cloned()
5382                        .flatten()
5383                })
5384            {
5385                buffer.update(cx, |buffer, cx| buffer.set_diff_base(diff_base, cx));
5386            }
5387            Ok(())
5388        })
5389    }
5390
5391    async fn handle_update_buffer_file(
5392        this: ModelHandle<Self>,
5393        envelope: TypedEnvelope<proto::UpdateBufferFile>,
5394        _: Arc<Client>,
5395        mut cx: AsyncAppContext,
5396    ) -> Result<()> {
5397        let buffer_id = envelope.payload.buffer_id;
5398
5399        this.update(&mut cx, |this, cx| {
5400            let payload = envelope.payload.clone();
5401            if let Some(buffer) = this
5402                .opened_buffers
5403                .get(&buffer_id)
5404                .and_then(|b| b.upgrade(cx))
5405                .or_else(|| {
5406                    this.incomplete_remote_buffers
5407                        .get(&buffer_id)
5408                        .cloned()
5409                        .flatten()
5410                })
5411            {
5412                let file = payload.file.ok_or_else(|| anyhow!("invalid file"))?;
5413                let worktree = this
5414                    .worktree_for_id(WorktreeId::from_proto(file.worktree_id), cx)
5415                    .ok_or_else(|| anyhow!("no such worktree"))?;
5416                let file = File::from_proto(file, worktree, cx)?;
5417                buffer.update(cx, |buffer, cx| {
5418                    buffer.file_updated(Arc::new(file), cx).detach();
5419                });
5420                this.detect_language_for_buffer(&buffer, cx);
5421            }
5422            Ok(())
5423        })
5424    }
5425
5426    async fn handle_save_buffer(
5427        this: ModelHandle<Self>,
5428        envelope: TypedEnvelope<proto::SaveBuffer>,
5429        _: Arc<Client>,
5430        mut cx: AsyncAppContext,
5431    ) -> Result<proto::BufferSaved> {
5432        let buffer_id = envelope.payload.buffer_id;
5433        let (project_id, buffer) = this.update(&mut cx, |this, cx| {
5434            let project_id = this.remote_id().ok_or_else(|| anyhow!("not connected"))?;
5435            let buffer = this
5436                .opened_buffers
5437                .get(&buffer_id)
5438                .and_then(|buffer| buffer.upgrade(cx))
5439                .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))?;
5440            anyhow::Ok((project_id, buffer))
5441        })?;
5442        buffer
5443            .update(&mut cx, |buffer, _| {
5444                buffer.wait_for_version(deserialize_version(&envelope.payload.version))
5445            })
5446            .await?;
5447        let buffer_id = buffer.read_with(&cx, |buffer, _| buffer.remote_id());
5448
5449        let (saved_version, fingerprint, mtime) = this
5450            .update(&mut cx, |this, cx| this.save_buffer(buffer, cx))
5451            .await?;
5452        Ok(proto::BufferSaved {
5453            project_id,
5454            buffer_id,
5455            version: serialize_version(&saved_version),
5456            mtime: Some(mtime.into()),
5457            fingerprint: language::proto::serialize_fingerprint(fingerprint),
5458        })
5459    }
5460
5461    async fn handle_reload_buffers(
5462        this: ModelHandle<Self>,
5463        envelope: TypedEnvelope<proto::ReloadBuffers>,
5464        _: Arc<Client>,
5465        mut cx: AsyncAppContext,
5466    ) -> Result<proto::ReloadBuffersResponse> {
5467        let sender_id = envelope.original_sender_id()?;
5468        let reload = this.update(&mut cx, |this, cx| {
5469            let mut buffers = HashSet::default();
5470            for buffer_id in &envelope.payload.buffer_ids {
5471                buffers.insert(
5472                    this.opened_buffers
5473                        .get(buffer_id)
5474                        .and_then(|buffer| buffer.upgrade(cx))
5475                        .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))?,
5476                );
5477            }
5478            Ok::<_, anyhow::Error>(this.reload_buffers(buffers, false, cx))
5479        })?;
5480
5481        let project_transaction = reload.await?;
5482        let project_transaction = this.update(&mut cx, |this, cx| {
5483            this.serialize_project_transaction_for_peer(project_transaction, sender_id, cx)
5484        });
5485        Ok(proto::ReloadBuffersResponse {
5486            transaction: Some(project_transaction),
5487        })
5488    }
5489
5490    async fn handle_synchronize_buffers(
5491        this: ModelHandle<Self>,
5492        envelope: TypedEnvelope<proto::SynchronizeBuffers>,
5493        _: Arc<Client>,
5494        mut cx: AsyncAppContext,
5495    ) -> Result<proto::SynchronizeBuffersResponse> {
5496        let project_id = envelope.payload.project_id;
5497        let mut response = proto::SynchronizeBuffersResponse {
5498            buffers: Default::default(),
5499        };
5500
5501        this.update(&mut cx, |this, cx| {
5502            let Some(guest_id) = envelope.original_sender_id else {
5503                log::error!("missing original_sender_id on SynchronizeBuffers request");
5504                return;
5505            };
5506
5507            this.shared_buffers.entry(guest_id).or_default().clear();
5508            for buffer in envelope.payload.buffers {
5509                let buffer_id = buffer.id;
5510                let remote_version = language::proto::deserialize_version(&buffer.version);
5511                if let Some(buffer) = this.buffer_for_id(buffer_id, cx) {
5512                    this.shared_buffers
5513                        .entry(guest_id)
5514                        .or_default()
5515                        .insert(buffer_id);
5516
5517                    let buffer = buffer.read(cx);
5518                    response.buffers.push(proto::BufferVersion {
5519                        id: buffer_id,
5520                        version: language::proto::serialize_version(&buffer.version),
5521                    });
5522
5523                    let operations = buffer.serialize_ops(Some(remote_version), cx);
5524                    let client = this.client.clone();
5525                    if let Some(file) = buffer.file() {
5526                        client
5527                            .send(proto::UpdateBufferFile {
5528                                project_id,
5529                                buffer_id: buffer_id as u64,
5530                                file: Some(file.to_proto()),
5531                            })
5532                            .log_err();
5533                    }
5534
5535                    client
5536                        .send(proto::UpdateDiffBase {
5537                            project_id,
5538                            buffer_id: buffer_id as u64,
5539                            diff_base: buffer.diff_base().map(Into::into),
5540                        })
5541                        .log_err();
5542
5543                    client
5544                        .send(proto::BufferReloaded {
5545                            project_id,
5546                            buffer_id,
5547                            version: language::proto::serialize_version(buffer.saved_version()),
5548                            mtime: Some(buffer.saved_mtime().into()),
5549                            fingerprint: language::proto::serialize_fingerprint(
5550                                buffer.saved_version_fingerprint(),
5551                            ),
5552                            line_ending: language::proto::serialize_line_ending(
5553                                buffer.line_ending(),
5554                            ) as i32,
5555                        })
5556                        .log_err();
5557
5558                    cx.background()
5559                        .spawn(
5560                            async move {
5561                                let operations = operations.await;
5562                                for chunk in split_operations(operations) {
5563                                    client
5564                                        .request(proto::UpdateBuffer {
5565                                            project_id,
5566                                            buffer_id,
5567                                            operations: chunk,
5568                                        })
5569                                        .await?;
5570                                }
5571                                anyhow::Ok(())
5572                            }
5573                            .log_err(),
5574                        )
5575                        .detach();
5576                }
5577            }
5578        });
5579
5580        Ok(response)
5581    }
5582
5583    async fn handle_format_buffers(
5584        this: ModelHandle<Self>,
5585        envelope: TypedEnvelope<proto::FormatBuffers>,
5586        _: Arc<Client>,
5587        mut cx: AsyncAppContext,
5588    ) -> Result<proto::FormatBuffersResponse> {
5589        let sender_id = envelope.original_sender_id()?;
5590        let format = this.update(&mut cx, |this, cx| {
5591            let mut buffers = HashSet::default();
5592            for buffer_id in &envelope.payload.buffer_ids {
5593                buffers.insert(
5594                    this.opened_buffers
5595                        .get(buffer_id)
5596                        .and_then(|buffer| buffer.upgrade(cx))
5597                        .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))?,
5598                );
5599            }
5600            let trigger = FormatTrigger::from_proto(envelope.payload.trigger);
5601            Ok::<_, anyhow::Error>(this.format(buffers, false, trigger, cx))
5602        })?;
5603
5604        let project_transaction = format.await?;
5605        let project_transaction = this.update(&mut cx, |this, cx| {
5606            this.serialize_project_transaction_for_peer(project_transaction, sender_id, cx)
5607        });
5608        Ok(proto::FormatBuffersResponse {
5609            transaction: Some(project_transaction),
5610        })
5611    }
5612
5613    async fn handle_get_completions(
5614        this: ModelHandle<Self>,
5615        envelope: TypedEnvelope<proto::GetCompletions>,
5616        _: Arc<Client>,
5617        mut cx: AsyncAppContext,
5618    ) -> Result<proto::GetCompletionsResponse> {
5619        let buffer = this.read_with(&cx, |this, cx| {
5620            this.opened_buffers
5621                .get(&envelope.payload.buffer_id)
5622                .and_then(|buffer| buffer.upgrade(cx))
5623                .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))
5624        })?;
5625
5626        let version = deserialize_version(&envelope.payload.version);
5627        buffer
5628            .update(&mut cx, |buffer, _| buffer.wait_for_version(version))
5629            .await?;
5630        let version = buffer.read_with(&cx, |buffer, _| buffer.version());
5631
5632        let position = envelope
5633            .payload
5634            .position
5635            .and_then(language::proto::deserialize_anchor)
5636            .map(|p| {
5637                buffer.read_with(&cx, |buffer, _| {
5638                    buffer.clip_point_utf16(Unclipped(p.to_point_utf16(buffer)), Bias::Left)
5639                })
5640            })
5641            .ok_or_else(|| anyhow!("invalid position"))?;
5642
5643        let completions = this
5644            .update(&mut cx, |this, cx| this.completions(&buffer, position, cx))
5645            .await?;
5646
5647        Ok(proto::GetCompletionsResponse {
5648            completions: completions
5649                .iter()
5650                .map(language::proto::serialize_completion)
5651                .collect(),
5652            version: serialize_version(&version),
5653        })
5654    }
5655
5656    async fn handle_apply_additional_edits_for_completion(
5657        this: ModelHandle<Self>,
5658        envelope: TypedEnvelope<proto::ApplyCompletionAdditionalEdits>,
5659        _: Arc<Client>,
5660        mut cx: AsyncAppContext,
5661    ) -> Result<proto::ApplyCompletionAdditionalEditsResponse> {
5662        let (buffer, completion) = this.update(&mut cx, |this, cx| {
5663            let buffer = this
5664                .opened_buffers
5665                .get(&envelope.payload.buffer_id)
5666                .and_then(|buffer| buffer.upgrade(cx))
5667                .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))?;
5668            let language = buffer.read(cx).language();
5669            let completion = language::proto::deserialize_completion(
5670                envelope
5671                    .payload
5672                    .completion
5673                    .ok_or_else(|| anyhow!("invalid completion"))?,
5674                language.cloned(),
5675            );
5676            Ok::<_, anyhow::Error>((buffer, completion))
5677        })?;
5678
5679        let completion = completion.await?;
5680
5681        let apply_additional_edits = this.update(&mut cx, |this, cx| {
5682            this.apply_additional_edits_for_completion(buffer, completion, false, cx)
5683        });
5684
5685        Ok(proto::ApplyCompletionAdditionalEditsResponse {
5686            transaction: apply_additional_edits
5687                .await?
5688                .as_ref()
5689                .map(language::proto::serialize_transaction),
5690        })
5691    }
5692
5693    async fn handle_get_code_actions(
5694        this: ModelHandle<Self>,
5695        envelope: TypedEnvelope<proto::GetCodeActions>,
5696        _: Arc<Client>,
5697        mut cx: AsyncAppContext,
5698    ) -> Result<proto::GetCodeActionsResponse> {
5699        let start = envelope
5700            .payload
5701            .start
5702            .and_then(language::proto::deserialize_anchor)
5703            .ok_or_else(|| anyhow!("invalid start"))?;
5704        let end = envelope
5705            .payload
5706            .end
5707            .and_then(language::proto::deserialize_anchor)
5708            .ok_or_else(|| anyhow!("invalid end"))?;
5709        let buffer = this.update(&mut cx, |this, cx| {
5710            this.opened_buffers
5711                .get(&envelope.payload.buffer_id)
5712                .and_then(|buffer| buffer.upgrade(cx))
5713                .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))
5714        })?;
5715        buffer
5716            .update(&mut cx, |buffer, _| {
5717                buffer.wait_for_version(deserialize_version(&envelope.payload.version))
5718            })
5719            .await?;
5720
5721        let version = buffer.read_with(&cx, |buffer, _| buffer.version());
5722        let code_actions = this.update(&mut cx, |this, cx| {
5723            Ok::<_, anyhow::Error>(this.code_actions(&buffer, start..end, cx))
5724        })?;
5725
5726        Ok(proto::GetCodeActionsResponse {
5727            actions: code_actions
5728                .await?
5729                .iter()
5730                .map(language::proto::serialize_code_action)
5731                .collect(),
5732            version: serialize_version(&version),
5733        })
5734    }
5735
5736    async fn handle_apply_code_action(
5737        this: ModelHandle<Self>,
5738        envelope: TypedEnvelope<proto::ApplyCodeAction>,
5739        _: Arc<Client>,
5740        mut cx: AsyncAppContext,
5741    ) -> Result<proto::ApplyCodeActionResponse> {
5742        let sender_id = envelope.original_sender_id()?;
5743        let action = language::proto::deserialize_code_action(
5744            envelope
5745                .payload
5746                .action
5747                .ok_or_else(|| anyhow!("invalid action"))?,
5748        )?;
5749        let apply_code_action = this.update(&mut cx, |this, cx| {
5750            let buffer = this
5751                .opened_buffers
5752                .get(&envelope.payload.buffer_id)
5753                .and_then(|buffer| buffer.upgrade(cx))
5754                .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))?;
5755            Ok::<_, anyhow::Error>(this.apply_code_action(buffer, action, false, cx))
5756        })?;
5757
5758        let project_transaction = apply_code_action.await?;
5759        let project_transaction = this.update(&mut cx, |this, cx| {
5760            this.serialize_project_transaction_for_peer(project_transaction, sender_id, cx)
5761        });
5762        Ok(proto::ApplyCodeActionResponse {
5763            transaction: Some(project_transaction),
5764        })
5765    }
5766
5767    async fn handle_lsp_command<T: LspCommand>(
5768        this: ModelHandle<Self>,
5769        envelope: TypedEnvelope<T::ProtoRequest>,
5770        _: Arc<Client>,
5771        mut cx: AsyncAppContext,
5772    ) -> Result<<T::ProtoRequest as proto::RequestMessage>::Response>
5773    where
5774        <T::LspRequest as lsp::request::Request>::Result: Send,
5775    {
5776        let sender_id = envelope.original_sender_id()?;
5777        let buffer_id = T::buffer_id_from_proto(&envelope.payload);
5778        let buffer_handle = this.read_with(&cx, |this, _| {
5779            this.opened_buffers
5780                .get(&buffer_id)
5781                .and_then(|buffer| buffer.upgrade(&cx))
5782                .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))
5783        })?;
5784        let request = T::from_proto(
5785            envelope.payload,
5786            this.clone(),
5787            buffer_handle.clone(),
5788            cx.clone(),
5789        )
5790        .await?;
5791        let buffer_version = buffer_handle.read_with(&cx, |buffer, _| buffer.version());
5792        let response = this
5793            .update(&mut cx, |this, cx| {
5794                this.request_lsp(buffer_handle, request, cx)
5795            })
5796            .await?;
5797        this.update(&mut cx, |this, cx| {
5798            Ok(T::response_to_proto(
5799                response,
5800                this,
5801                sender_id,
5802                &buffer_version,
5803                cx,
5804            ))
5805        })
5806    }
5807
5808    async fn handle_get_project_symbols(
5809        this: ModelHandle<Self>,
5810        envelope: TypedEnvelope<proto::GetProjectSymbols>,
5811        _: Arc<Client>,
5812        mut cx: AsyncAppContext,
5813    ) -> Result<proto::GetProjectSymbolsResponse> {
5814        let symbols = this
5815            .update(&mut cx, |this, cx| {
5816                this.symbols(&envelope.payload.query, cx)
5817            })
5818            .await?;
5819
5820        Ok(proto::GetProjectSymbolsResponse {
5821            symbols: symbols.iter().map(serialize_symbol).collect(),
5822        })
5823    }
5824
5825    async fn handle_search_project(
5826        this: ModelHandle<Self>,
5827        envelope: TypedEnvelope<proto::SearchProject>,
5828        _: Arc<Client>,
5829        mut cx: AsyncAppContext,
5830    ) -> Result<proto::SearchProjectResponse> {
5831        let peer_id = envelope.original_sender_id()?;
5832        let query = SearchQuery::from_proto(envelope.payload)?;
5833        let result = this
5834            .update(&mut cx, |this, cx| this.search(query, cx))
5835            .await?;
5836
5837        this.update(&mut cx, |this, cx| {
5838            let mut locations = Vec::new();
5839            for (buffer, ranges) in result {
5840                for range in ranges {
5841                    let start = serialize_anchor(&range.start);
5842                    let end = serialize_anchor(&range.end);
5843                    let buffer_id = this.create_buffer_for_peer(&buffer, peer_id, cx);
5844                    locations.push(proto::Location {
5845                        buffer_id,
5846                        start: Some(start),
5847                        end: Some(end),
5848                    });
5849                }
5850            }
5851            Ok(proto::SearchProjectResponse { locations })
5852        })
5853    }
5854
5855    async fn handle_open_buffer_for_symbol(
5856        this: ModelHandle<Self>,
5857        envelope: TypedEnvelope<proto::OpenBufferForSymbol>,
5858        _: Arc<Client>,
5859        mut cx: AsyncAppContext,
5860    ) -> Result<proto::OpenBufferForSymbolResponse> {
5861        let peer_id = envelope.original_sender_id()?;
5862        let symbol = envelope
5863            .payload
5864            .symbol
5865            .ok_or_else(|| anyhow!("invalid symbol"))?;
5866        let symbol = this
5867            .read_with(&cx, |this, _| this.deserialize_symbol(symbol))
5868            .await?;
5869        let symbol = this.read_with(&cx, |this, _| {
5870            let signature = this.symbol_signature(&symbol.path);
5871            if signature == symbol.signature {
5872                Ok(symbol)
5873            } else {
5874                Err(anyhow!("invalid symbol signature"))
5875            }
5876        })?;
5877        let buffer = this
5878            .update(&mut cx, |this, cx| this.open_buffer_for_symbol(&symbol, cx))
5879            .await?;
5880
5881        Ok(proto::OpenBufferForSymbolResponse {
5882            buffer_id: this.update(&mut cx, |this, cx| {
5883                this.create_buffer_for_peer(&buffer, peer_id, cx)
5884            }),
5885        })
5886    }
5887
5888    fn symbol_signature(&self, project_path: &ProjectPath) -> [u8; 32] {
5889        let mut hasher = Sha256::new();
5890        hasher.update(project_path.worktree_id.to_proto().to_be_bytes());
5891        hasher.update(project_path.path.to_string_lossy().as_bytes());
5892        hasher.update(self.nonce.to_be_bytes());
5893        hasher.finalize().as_slice().try_into().unwrap()
5894    }
5895
5896    async fn handle_open_buffer_by_id(
5897        this: ModelHandle<Self>,
5898        envelope: TypedEnvelope<proto::OpenBufferById>,
5899        _: Arc<Client>,
5900        mut cx: AsyncAppContext,
5901    ) -> Result<proto::OpenBufferResponse> {
5902        let peer_id = envelope.original_sender_id()?;
5903        let buffer = this
5904            .update(&mut cx, |this, cx| {
5905                this.open_buffer_by_id(envelope.payload.id, cx)
5906            })
5907            .await?;
5908        this.update(&mut cx, |this, cx| {
5909            Ok(proto::OpenBufferResponse {
5910                buffer_id: this.create_buffer_for_peer(&buffer, peer_id, cx),
5911            })
5912        })
5913    }
5914
5915    async fn handle_open_buffer_by_path(
5916        this: ModelHandle<Self>,
5917        envelope: TypedEnvelope<proto::OpenBufferByPath>,
5918        _: Arc<Client>,
5919        mut cx: AsyncAppContext,
5920    ) -> Result<proto::OpenBufferResponse> {
5921        let peer_id = envelope.original_sender_id()?;
5922        let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
5923        let open_buffer = this.update(&mut cx, |this, cx| {
5924            this.open_buffer(
5925                ProjectPath {
5926                    worktree_id,
5927                    path: PathBuf::from(envelope.payload.path).into(),
5928                },
5929                cx,
5930            )
5931        });
5932
5933        let buffer = open_buffer.await?;
5934        this.update(&mut cx, |this, cx| {
5935            Ok(proto::OpenBufferResponse {
5936                buffer_id: this.create_buffer_for_peer(&buffer, peer_id, cx),
5937            })
5938        })
5939    }
5940
5941    fn serialize_project_transaction_for_peer(
5942        &mut self,
5943        project_transaction: ProjectTransaction,
5944        peer_id: proto::PeerId,
5945        cx: &mut AppContext,
5946    ) -> proto::ProjectTransaction {
5947        let mut serialized_transaction = proto::ProjectTransaction {
5948            buffer_ids: Default::default(),
5949            transactions: Default::default(),
5950        };
5951        for (buffer, transaction) in project_transaction.0 {
5952            serialized_transaction
5953                .buffer_ids
5954                .push(self.create_buffer_for_peer(&buffer, peer_id, cx));
5955            serialized_transaction
5956                .transactions
5957                .push(language::proto::serialize_transaction(&transaction));
5958        }
5959        serialized_transaction
5960    }
5961
5962    fn deserialize_project_transaction(
5963        &mut self,
5964        message: proto::ProjectTransaction,
5965        push_to_history: bool,
5966        cx: &mut ModelContext<Self>,
5967    ) -> Task<Result<ProjectTransaction>> {
5968        cx.spawn(|this, mut cx| async move {
5969            let mut project_transaction = ProjectTransaction::default();
5970            for (buffer_id, transaction) in message.buffer_ids.into_iter().zip(message.transactions)
5971            {
5972                let buffer = this
5973                    .update(&mut cx, |this, cx| {
5974                        this.wait_for_remote_buffer(buffer_id, cx)
5975                    })
5976                    .await?;
5977                let transaction = language::proto::deserialize_transaction(transaction)?;
5978                project_transaction.0.insert(buffer, transaction);
5979            }
5980
5981            for (buffer, transaction) in &project_transaction.0 {
5982                buffer
5983                    .update(&mut cx, |buffer, _| {
5984                        buffer.wait_for_edits(transaction.edit_ids.iter().copied())
5985                    })
5986                    .await?;
5987
5988                if push_to_history {
5989                    buffer.update(&mut cx, |buffer, _| {
5990                        buffer.push_transaction(transaction.clone(), Instant::now());
5991                    });
5992                }
5993            }
5994
5995            Ok(project_transaction)
5996        })
5997    }
5998
5999    fn create_buffer_for_peer(
6000        &mut self,
6001        buffer: &ModelHandle<Buffer>,
6002        peer_id: proto::PeerId,
6003        cx: &mut AppContext,
6004    ) -> u64 {
6005        let buffer_id = buffer.read(cx).remote_id();
6006        if let Some(ProjectClientState::Local { updates_tx, .. }) = &self.client_state {
6007            updates_tx
6008                .unbounded_send(LocalProjectUpdate::CreateBufferForPeer { peer_id, buffer_id })
6009                .ok();
6010        }
6011        buffer_id
6012    }
6013
6014    fn wait_for_remote_buffer(
6015        &mut self,
6016        id: u64,
6017        cx: &mut ModelContext<Self>,
6018    ) -> Task<Result<ModelHandle<Buffer>>> {
6019        let mut opened_buffer_rx = self.opened_buffer.1.clone();
6020
6021        cx.spawn_weak(|this, mut cx| async move {
6022            let buffer = loop {
6023                let Some(this) = this.upgrade(&cx) else {
6024                    return Err(anyhow!("project dropped"));
6025                };
6026                let buffer = this.read_with(&cx, |this, cx| {
6027                    this.opened_buffers
6028                        .get(&id)
6029                        .and_then(|buffer| buffer.upgrade(cx))
6030                });
6031                if let Some(buffer) = buffer {
6032                    break buffer;
6033                } else if this.read_with(&cx, |this, _| this.is_read_only()) {
6034                    return Err(anyhow!("disconnected before buffer {} could be opened", id));
6035                }
6036
6037                this.update(&mut cx, |this, _| {
6038                    this.incomplete_remote_buffers.entry(id).or_default();
6039                });
6040                drop(this);
6041                opened_buffer_rx
6042                    .next()
6043                    .await
6044                    .ok_or_else(|| anyhow!("project dropped while waiting for buffer"))?;
6045            };
6046            buffer.update(&mut cx, |buffer, cx| buffer.git_diff_recalc(cx));
6047            Ok(buffer)
6048        })
6049    }
6050
6051    fn synchronize_remote_buffers(&mut self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
6052        let project_id = match self.client_state.as_ref() {
6053            Some(ProjectClientState::Remote {
6054                sharing_has_stopped,
6055                remote_id,
6056                ..
6057            }) => {
6058                if *sharing_has_stopped {
6059                    return Task::ready(Err(anyhow!(
6060                        "can't synchronize remote buffers on a readonly project"
6061                    )));
6062                } else {
6063                    *remote_id
6064                }
6065            }
6066            Some(ProjectClientState::Local { .. }) | None => {
6067                return Task::ready(Err(anyhow!(
6068                    "can't synchronize remote buffers on a local project"
6069                )))
6070            }
6071        };
6072
6073        let client = self.client.clone();
6074        cx.spawn(|this, cx| async move {
6075            let (buffers, incomplete_buffer_ids) = this.read_with(&cx, |this, cx| {
6076                let buffers = this
6077                    .opened_buffers
6078                    .iter()
6079                    .filter_map(|(id, buffer)| {
6080                        let buffer = buffer.upgrade(cx)?;
6081                        Some(proto::BufferVersion {
6082                            id: *id,
6083                            version: language::proto::serialize_version(&buffer.read(cx).version),
6084                        })
6085                    })
6086                    .collect();
6087                let incomplete_buffer_ids = this
6088                    .incomplete_remote_buffers
6089                    .keys()
6090                    .copied()
6091                    .collect::<Vec<_>>();
6092
6093                (buffers, incomplete_buffer_ids)
6094            });
6095            let response = client
6096                .request(proto::SynchronizeBuffers {
6097                    project_id,
6098                    buffers,
6099                })
6100                .await?;
6101
6102            let send_updates_for_buffers = response.buffers.into_iter().map(|buffer| {
6103                let client = client.clone();
6104                let buffer_id = buffer.id;
6105                let remote_version = language::proto::deserialize_version(&buffer.version);
6106                this.read_with(&cx, |this, cx| {
6107                    if let Some(buffer) = this.buffer_for_id(buffer_id, cx) {
6108                        let operations = buffer.read(cx).serialize_ops(Some(remote_version), cx);
6109                        cx.background().spawn(async move {
6110                            let operations = operations.await;
6111                            for chunk in split_operations(operations) {
6112                                client
6113                                    .request(proto::UpdateBuffer {
6114                                        project_id,
6115                                        buffer_id,
6116                                        operations: chunk,
6117                                    })
6118                                    .await?;
6119                            }
6120                            anyhow::Ok(())
6121                        })
6122                    } else {
6123                        Task::ready(Ok(()))
6124                    }
6125                })
6126            });
6127
6128            // Any incomplete buffers have open requests waiting. Request that the host sends
6129            // creates these buffers for us again to unblock any waiting futures.
6130            for id in incomplete_buffer_ids {
6131                cx.background()
6132                    .spawn(client.request(proto::OpenBufferById { project_id, id }))
6133                    .detach();
6134            }
6135
6136            futures::future::join_all(send_updates_for_buffers)
6137                .await
6138                .into_iter()
6139                .collect()
6140        })
6141    }
6142
6143    pub fn worktree_metadata_protos(&self, cx: &AppContext) -> Vec<proto::WorktreeMetadata> {
6144        self.worktrees(cx)
6145            .map(|worktree| {
6146                let worktree = worktree.read(cx);
6147                proto::WorktreeMetadata {
6148                    id: worktree.id().to_proto(),
6149                    root_name: worktree.root_name().into(),
6150                    visible: worktree.is_visible(),
6151                    abs_path: worktree.abs_path().to_string_lossy().into(),
6152                }
6153            })
6154            .collect()
6155    }
6156
6157    fn set_worktrees_from_proto(
6158        &mut self,
6159        worktrees: Vec<proto::WorktreeMetadata>,
6160        cx: &mut ModelContext<Project>,
6161    ) -> Result<()> {
6162        let replica_id = self.replica_id();
6163        let remote_id = self.remote_id().ok_or_else(|| anyhow!("invalid project"))?;
6164
6165        let mut old_worktrees_by_id = self
6166            .worktrees
6167            .drain(..)
6168            .filter_map(|worktree| {
6169                let worktree = worktree.upgrade(cx)?;
6170                Some((worktree.read(cx).id(), worktree))
6171            })
6172            .collect::<HashMap<_, _>>();
6173
6174        for worktree in worktrees {
6175            if let Some(old_worktree) =
6176                old_worktrees_by_id.remove(&WorktreeId::from_proto(worktree.id))
6177            {
6178                self.worktrees.push(WorktreeHandle::Strong(old_worktree));
6179            } else {
6180                let worktree =
6181                    Worktree::remote(remote_id, replica_id, worktree, self.client.clone(), cx);
6182                let _ = self.add_worktree(&worktree, cx);
6183            }
6184        }
6185
6186        let _ = self.metadata_changed(cx);
6187        for (id, _) in old_worktrees_by_id {
6188            cx.emit(Event::WorktreeRemoved(id));
6189        }
6190
6191        Ok(())
6192    }
6193
6194    fn set_collaborators_from_proto(
6195        &mut self,
6196        messages: Vec<proto::Collaborator>,
6197        cx: &mut ModelContext<Self>,
6198    ) -> Result<()> {
6199        let mut collaborators = HashMap::default();
6200        for message in messages {
6201            let collaborator = Collaborator::from_proto(message)?;
6202            collaborators.insert(collaborator.peer_id, collaborator);
6203        }
6204        for old_peer_id in self.collaborators.keys() {
6205            if !collaborators.contains_key(old_peer_id) {
6206                cx.emit(Event::CollaboratorLeft(*old_peer_id));
6207            }
6208        }
6209        self.collaborators = collaborators;
6210        Ok(())
6211    }
6212
6213    fn deserialize_symbol(
6214        &self,
6215        serialized_symbol: proto::Symbol,
6216    ) -> impl Future<Output = Result<Symbol>> {
6217        let languages = self.languages.clone();
6218        async move {
6219            let source_worktree_id = WorktreeId::from_proto(serialized_symbol.source_worktree_id);
6220            let worktree_id = WorktreeId::from_proto(serialized_symbol.worktree_id);
6221            let start = serialized_symbol
6222                .start
6223                .ok_or_else(|| anyhow!("invalid start"))?;
6224            let end = serialized_symbol
6225                .end
6226                .ok_or_else(|| anyhow!("invalid end"))?;
6227            let kind = unsafe { mem::transmute(serialized_symbol.kind) };
6228            let path = ProjectPath {
6229                worktree_id,
6230                path: PathBuf::from(serialized_symbol.path).into(),
6231            };
6232            let language = languages.language_for_path(&path.path).await.log_err();
6233            Ok(Symbol {
6234                language_server_name: LanguageServerName(
6235                    serialized_symbol.language_server_name.into(),
6236                ),
6237                source_worktree_id,
6238                path,
6239                label: {
6240                    match language {
6241                        Some(language) => {
6242                            language
6243                                .label_for_symbol(&serialized_symbol.name, kind)
6244                                .await
6245                        }
6246                        None => None,
6247                    }
6248                    .unwrap_or_else(|| CodeLabel::plain(serialized_symbol.name.clone(), None))
6249                },
6250
6251                name: serialized_symbol.name,
6252                range: Unclipped(PointUtf16::new(start.row, start.column))
6253                    ..Unclipped(PointUtf16::new(end.row, end.column)),
6254                kind,
6255                signature: serialized_symbol
6256                    .signature
6257                    .try_into()
6258                    .map_err(|_| anyhow!("invalid signature"))?,
6259            })
6260        }
6261    }
6262
6263    async fn handle_buffer_saved(
6264        this: ModelHandle<Self>,
6265        envelope: TypedEnvelope<proto::BufferSaved>,
6266        _: Arc<Client>,
6267        mut cx: AsyncAppContext,
6268    ) -> Result<()> {
6269        let fingerprint = deserialize_fingerprint(&envelope.payload.fingerprint)?;
6270        let version = deserialize_version(&envelope.payload.version);
6271        let mtime = envelope
6272            .payload
6273            .mtime
6274            .ok_or_else(|| anyhow!("missing mtime"))?
6275            .into();
6276
6277        this.update(&mut cx, |this, cx| {
6278            let buffer = this
6279                .opened_buffers
6280                .get(&envelope.payload.buffer_id)
6281                .and_then(|buffer| buffer.upgrade(cx))
6282                .or_else(|| {
6283                    this.incomplete_remote_buffers
6284                        .get(&envelope.payload.buffer_id)
6285                        .and_then(|b| b.clone())
6286                });
6287            if let Some(buffer) = buffer {
6288                buffer.update(cx, |buffer, cx| {
6289                    buffer.did_save(version, fingerprint, mtime, cx);
6290                });
6291            }
6292            Ok(())
6293        })
6294    }
6295
6296    async fn handle_buffer_reloaded(
6297        this: ModelHandle<Self>,
6298        envelope: TypedEnvelope<proto::BufferReloaded>,
6299        _: Arc<Client>,
6300        mut cx: AsyncAppContext,
6301    ) -> Result<()> {
6302        let payload = envelope.payload;
6303        let version = deserialize_version(&payload.version);
6304        let fingerprint = deserialize_fingerprint(&payload.fingerprint)?;
6305        let line_ending = deserialize_line_ending(
6306            proto::LineEnding::from_i32(payload.line_ending)
6307                .ok_or_else(|| anyhow!("missing line ending"))?,
6308        );
6309        let mtime = payload
6310            .mtime
6311            .ok_or_else(|| anyhow!("missing mtime"))?
6312            .into();
6313        this.update(&mut cx, |this, cx| {
6314            let buffer = this
6315                .opened_buffers
6316                .get(&payload.buffer_id)
6317                .and_then(|buffer| buffer.upgrade(cx))
6318                .or_else(|| {
6319                    this.incomplete_remote_buffers
6320                        .get(&payload.buffer_id)
6321                        .cloned()
6322                        .flatten()
6323                });
6324            if let Some(buffer) = buffer {
6325                buffer.update(cx, |buffer, cx| {
6326                    buffer.did_reload(version, fingerprint, line_ending, mtime, cx);
6327                });
6328            }
6329            Ok(())
6330        })
6331    }
6332
6333    #[allow(clippy::type_complexity)]
6334    fn edits_from_lsp(
6335        &mut self,
6336        buffer: &ModelHandle<Buffer>,
6337        lsp_edits: impl 'static + Send + IntoIterator<Item = lsp::TextEdit>,
6338        version: Option<i32>,
6339        cx: &mut ModelContext<Self>,
6340    ) -> Task<Result<Vec<(Range<Anchor>, String)>>> {
6341        let snapshot = self.buffer_snapshot_for_lsp_version(buffer, version, cx);
6342        cx.background().spawn(async move {
6343            let snapshot = snapshot?;
6344            let mut lsp_edits = lsp_edits
6345                .into_iter()
6346                .map(|edit| (range_from_lsp(edit.range), edit.new_text))
6347                .collect::<Vec<_>>();
6348            lsp_edits.sort_by_key(|(range, _)| range.start);
6349
6350            let mut lsp_edits = lsp_edits.into_iter().peekable();
6351            let mut edits = Vec::new();
6352            while let Some((range, mut new_text)) = lsp_edits.next() {
6353                // Clip invalid ranges provided by the language server.
6354                let mut range = snapshot.clip_point_utf16(range.start, Bias::Left)
6355                    ..snapshot.clip_point_utf16(range.end, Bias::Left);
6356
6357                // Combine any LSP edits that are adjacent.
6358                //
6359                // Also, combine LSP edits that are separated from each other by only
6360                // a newline. This is important because for some code actions,
6361                // Rust-analyzer rewrites the entire buffer via a series of edits that
6362                // are separated by unchanged newline characters.
6363                //
6364                // In order for the diffing logic below to work properly, any edits that
6365                // cancel each other out must be combined into one.
6366                while let Some((next_range, next_text)) = lsp_edits.peek() {
6367                    if next_range.start.0 > range.end {
6368                        if next_range.start.0.row > range.end.row + 1
6369                            || next_range.start.0.column > 0
6370                            || snapshot.clip_point_utf16(
6371                                Unclipped(PointUtf16::new(range.end.row, u32::MAX)),
6372                                Bias::Left,
6373                            ) > range.end
6374                        {
6375                            break;
6376                        }
6377                        new_text.push('\n');
6378                    }
6379                    range.end = snapshot.clip_point_utf16(next_range.end, Bias::Left);
6380                    new_text.push_str(next_text);
6381                    lsp_edits.next();
6382                }
6383
6384                // For multiline edits, perform a diff of the old and new text so that
6385                // we can identify the changes more precisely, preserving the locations
6386                // of any anchors positioned in the unchanged regions.
6387                if range.end.row > range.start.row {
6388                    let mut offset = range.start.to_offset(&snapshot);
6389                    let old_text = snapshot.text_for_range(range).collect::<String>();
6390
6391                    let diff = TextDiff::from_lines(old_text.as_str(), &new_text);
6392                    let mut moved_since_edit = true;
6393                    for change in diff.iter_all_changes() {
6394                        let tag = change.tag();
6395                        let value = change.value();
6396                        match tag {
6397                            ChangeTag::Equal => {
6398                                offset += value.len();
6399                                moved_since_edit = true;
6400                            }
6401                            ChangeTag::Delete => {
6402                                let start = snapshot.anchor_after(offset);
6403                                let end = snapshot.anchor_before(offset + value.len());
6404                                if moved_since_edit {
6405                                    edits.push((start..end, String::new()));
6406                                } else {
6407                                    edits.last_mut().unwrap().0.end = end;
6408                                }
6409                                offset += value.len();
6410                                moved_since_edit = false;
6411                            }
6412                            ChangeTag::Insert => {
6413                                if moved_since_edit {
6414                                    let anchor = snapshot.anchor_after(offset);
6415                                    edits.push((anchor..anchor, value.to_string()));
6416                                } else {
6417                                    edits.last_mut().unwrap().1.push_str(value);
6418                                }
6419                                moved_since_edit = false;
6420                            }
6421                        }
6422                    }
6423                } else if range.end == range.start {
6424                    let anchor = snapshot.anchor_after(range.start);
6425                    edits.push((anchor..anchor, new_text));
6426                } else {
6427                    let edit_start = snapshot.anchor_after(range.start);
6428                    let edit_end = snapshot.anchor_before(range.end);
6429                    edits.push((edit_start..edit_end, new_text));
6430                }
6431            }
6432
6433            Ok(edits)
6434        })
6435    }
6436
6437    fn buffer_snapshot_for_lsp_version(
6438        &mut self,
6439        buffer: &ModelHandle<Buffer>,
6440        version: Option<i32>,
6441        cx: &AppContext,
6442    ) -> Result<TextBufferSnapshot> {
6443        const OLD_VERSIONS_TO_RETAIN: i32 = 10;
6444
6445        if let Some(version) = version {
6446            let buffer_id = buffer.read(cx).remote_id();
6447            let snapshots = self
6448                .buffer_snapshots
6449                .get_mut(&buffer_id)
6450                .ok_or_else(|| anyhow!("no snapshot found for buffer {}", buffer_id))?;
6451            let found_snapshot = snapshots
6452                .binary_search_by_key(&version, |e| e.0)
6453                .map(|ix| snapshots[ix].1.clone())
6454                .map_err(|_| {
6455                    anyhow!(
6456                        "snapshot not found for buffer {} at version {}",
6457                        buffer_id,
6458                        version
6459                    )
6460                })?;
6461            snapshots.retain(|(snapshot_version, _)| {
6462                snapshot_version + OLD_VERSIONS_TO_RETAIN >= version
6463            });
6464            Ok(found_snapshot)
6465        } else {
6466            Ok((buffer.read(cx)).text_snapshot())
6467        }
6468    }
6469
6470    fn language_server_for_buffer(
6471        &self,
6472        buffer: &Buffer,
6473        cx: &AppContext,
6474    ) -> Option<(&Arc<CachedLspAdapter>, &Arc<LanguageServer>)> {
6475        let server_id = self.language_server_id_for_buffer(buffer, cx)?;
6476        let server = self.language_servers.get(&server_id)?;
6477        if let LanguageServerState::Running {
6478            adapter, server, ..
6479        } = server
6480        {
6481            Some((adapter, server))
6482        } else {
6483            None
6484        }
6485    }
6486
6487    fn language_server_id_for_buffer(&self, buffer: &Buffer, cx: &AppContext) -> Option<usize> {
6488        if let Some((file, language)) = File::from_dyn(buffer.file()).zip(buffer.language()) {
6489            let name = language.lsp_adapter()?.name.clone();
6490            let worktree_id = file.worktree_id(cx);
6491            let key = (worktree_id, name);
6492            self.language_server_ids.get(&key).copied()
6493        } else {
6494            None
6495        }
6496    }
6497}
6498
6499impl WorktreeHandle {
6500    pub fn upgrade(&self, cx: &AppContext) -> Option<ModelHandle<Worktree>> {
6501        match self {
6502            WorktreeHandle::Strong(handle) => Some(handle.clone()),
6503            WorktreeHandle::Weak(handle) => handle.upgrade(cx),
6504        }
6505    }
6506}
6507
6508impl OpenBuffer {
6509    pub fn upgrade(&self, cx: &impl UpgradeModelHandle) -> Option<ModelHandle<Buffer>> {
6510        match self {
6511            OpenBuffer::Strong(handle) => Some(handle.clone()),
6512            OpenBuffer::Weak(handle) => handle.upgrade(cx),
6513            OpenBuffer::Operations(_) => None,
6514        }
6515    }
6516}
6517
6518pub struct PathMatchCandidateSet {
6519    pub snapshot: Snapshot,
6520    pub include_ignored: bool,
6521    pub include_root_name: bool,
6522}
6523
6524impl<'a> fuzzy::PathMatchCandidateSet<'a> for PathMatchCandidateSet {
6525    type Candidates = PathMatchCandidateSetIter<'a>;
6526
6527    fn id(&self) -> usize {
6528        self.snapshot.id().to_usize()
6529    }
6530
6531    fn len(&self) -> usize {
6532        if self.include_ignored {
6533            self.snapshot.file_count()
6534        } else {
6535            self.snapshot.visible_file_count()
6536        }
6537    }
6538
6539    fn prefix(&self) -> Arc<str> {
6540        if self.snapshot.root_entry().map_or(false, |e| e.is_file()) {
6541            self.snapshot.root_name().into()
6542        } else if self.include_root_name {
6543            format!("{}/", self.snapshot.root_name()).into()
6544        } else {
6545            "".into()
6546        }
6547    }
6548
6549    fn candidates(&'a self, start: usize) -> Self::Candidates {
6550        PathMatchCandidateSetIter {
6551            traversal: self.snapshot.files(self.include_ignored, start),
6552        }
6553    }
6554}
6555
6556pub struct PathMatchCandidateSetIter<'a> {
6557    traversal: Traversal<'a>,
6558}
6559
6560impl<'a> Iterator for PathMatchCandidateSetIter<'a> {
6561    type Item = fuzzy::PathMatchCandidate<'a>;
6562
6563    fn next(&mut self) -> Option<Self::Item> {
6564        self.traversal.next().map(|entry| {
6565            if let EntryKind::File(char_bag) = entry.kind {
6566                fuzzy::PathMatchCandidate {
6567                    path: &entry.path,
6568                    char_bag,
6569                }
6570            } else {
6571                unreachable!()
6572            }
6573        })
6574    }
6575}
6576
6577impl Entity for Project {
6578    type Event = Event;
6579
6580    fn release(&mut self, _: &mut gpui::AppContext) {
6581        match &self.client_state {
6582            Some(ProjectClientState::Local { remote_id, .. }) => {
6583                let _ = self.client.send(proto::UnshareProject {
6584                    project_id: *remote_id,
6585                });
6586            }
6587            Some(ProjectClientState::Remote { remote_id, .. }) => {
6588                let _ = self.client.send(proto::LeaveProject {
6589                    project_id: *remote_id,
6590                });
6591            }
6592            _ => {}
6593        }
6594    }
6595
6596    fn app_will_quit(
6597        &mut self,
6598        _: &mut AppContext,
6599    ) -> Option<std::pin::Pin<Box<dyn 'static + Future<Output = ()>>>> {
6600        let shutdown_futures = self
6601            .language_servers
6602            .drain()
6603            .map(|(_, server_state)| async {
6604                match server_state {
6605                    LanguageServerState::Running { server, .. } => server.shutdown()?.await,
6606                    LanguageServerState::Starting(starting_server) => {
6607                        starting_server.await?.shutdown()?.await
6608                    }
6609                }
6610            })
6611            .collect::<Vec<_>>();
6612
6613        Some(
6614            async move {
6615                futures::future::join_all(shutdown_futures).await;
6616            }
6617            .boxed(),
6618        )
6619    }
6620}
6621
6622impl Collaborator {
6623    fn from_proto(message: proto::Collaborator) -> Result<Self> {
6624        Ok(Self {
6625            peer_id: message.peer_id.ok_or_else(|| anyhow!("invalid peer id"))?,
6626            replica_id: message.replica_id as ReplicaId,
6627        })
6628    }
6629}
6630
6631impl<P: AsRef<Path>> From<(WorktreeId, P)> for ProjectPath {
6632    fn from((worktree_id, path): (WorktreeId, P)) -> Self {
6633        Self {
6634            worktree_id,
6635            path: path.as_ref().into(),
6636        }
6637    }
6638}
6639
6640fn split_operations(
6641    mut operations: Vec<proto::Operation>,
6642) -> impl Iterator<Item = Vec<proto::Operation>> {
6643    #[cfg(any(test, feature = "test-support"))]
6644    const CHUNK_SIZE: usize = 5;
6645
6646    #[cfg(not(any(test, feature = "test-support")))]
6647    const CHUNK_SIZE: usize = 100;
6648
6649    let mut done = false;
6650    std::iter::from_fn(move || {
6651        if done {
6652            return None;
6653        }
6654
6655        let operations = operations
6656            .drain(..cmp::min(CHUNK_SIZE, operations.len()))
6657            .collect::<Vec<_>>();
6658        if operations.is_empty() {
6659            done = true;
6660        }
6661        Some(operations)
6662    })
6663}
6664
6665fn serialize_symbol(symbol: &Symbol) -> proto::Symbol {
6666    proto::Symbol {
6667        language_server_name: symbol.language_server_name.0.to_string(),
6668        source_worktree_id: symbol.source_worktree_id.to_proto(),
6669        worktree_id: symbol.path.worktree_id.to_proto(),
6670        path: symbol.path.path.to_string_lossy().to_string(),
6671        name: symbol.name.clone(),
6672        kind: unsafe { mem::transmute(symbol.kind) },
6673        start: Some(proto::PointUtf16 {
6674            row: symbol.range.start.0.row,
6675            column: symbol.range.start.0.column,
6676        }),
6677        end: Some(proto::PointUtf16 {
6678            row: symbol.range.end.0.row,
6679            column: symbol.range.end.0.column,
6680        }),
6681        signature: symbol.signature.to_vec(),
6682    }
6683}
6684
6685fn relativize_path(base: &Path, path: &Path) -> PathBuf {
6686    let mut path_components = path.components();
6687    let mut base_components = base.components();
6688    let mut components: Vec<Component> = Vec::new();
6689    loop {
6690        match (path_components.next(), base_components.next()) {
6691            (None, None) => break,
6692            (Some(a), None) => {
6693                components.push(a);
6694                components.extend(path_components.by_ref());
6695                break;
6696            }
6697            (None, _) => components.push(Component::ParentDir),
6698            (Some(a), Some(b)) if components.is_empty() && a == b => (),
6699            (Some(a), Some(b)) if b == Component::CurDir => components.push(a),
6700            (Some(a), Some(_)) => {
6701                components.push(Component::ParentDir);
6702                for _ in base_components {
6703                    components.push(Component::ParentDir);
6704                }
6705                components.push(a);
6706                components.extend(path_components.by_ref());
6707                break;
6708            }
6709        }
6710    }
6711    components.iter().map(|c| c.as_os_str()).collect()
6712}
6713
6714impl Item for Buffer {
6715    fn entry_id(&self, cx: &AppContext) -> Option<ProjectEntryId> {
6716        File::from_dyn(self.file()).and_then(|file| file.project_entry_id(cx))
6717    }
6718
6719    fn project_path(&self, cx: &AppContext) -> Option<ProjectPath> {
6720        File::from_dyn(self.file()).map(|file| ProjectPath {
6721            worktree_id: file.worktree_id(cx),
6722            path: file.path().clone(),
6723        })
6724    }
6725}