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, CodeAction, CodeLabel,
  31    Completion, Diagnostic, DiagnosticEntry, DiagnosticSet, Diff, Event as BufferEvent, File as _,
  32    Language, LanguageRegistry, LanguageServerName, LocalFile, OffsetRangeExt, Operation, Patch,
  33    PointUtf16, RopeFingerprint, TextBufferSnapshot, ToOffset, ToPointUtf16, Transaction,
  34    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_lsp_command::<GetCodeActions>);
 413        client.add_model_request_handler(Self::handle_lsp_command::<GetCompletions>);
 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        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        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        self.unshare_internal(cx)?;
1164        self.metadata_changed(cx);
1165        cx.notify();
1166        Ok(())
1167    }
1168
1169    fn unshare_internal(&mut self, cx: &mut AppContext) -> Result<()> {
1170        if self.is_remote() {
1171            return Err(anyhow!("attempted to unshare a remote project"));
1172        }
1173
1174        if let Some(ProjectClientState::Local { remote_id, .. }) = self.client_state.take() {
1175            self.collaborators.clear();
1176            self.shared_buffers.clear();
1177            self.client_subscriptions.clear();
1178
1179            for worktree_handle in self.worktrees.iter_mut() {
1180                if let WorktreeHandle::Strong(worktree) = worktree_handle {
1181                    let is_visible = worktree.update(cx, |worktree, _| {
1182                        worktree.as_local_mut().unwrap().unshare();
1183                        worktree.is_visible()
1184                    });
1185                    if !is_visible {
1186                        *worktree_handle = WorktreeHandle::Weak(worktree.downgrade());
1187                    }
1188                }
1189            }
1190
1191            for open_buffer in self.opened_buffers.values_mut() {
1192                // Wake up any tasks waiting for peers' edits to this buffer.
1193                if let Some(buffer) = open_buffer.upgrade(cx) {
1194                    buffer.update(cx, |buffer, _| buffer.give_up_waiting());
1195                }
1196
1197                if let OpenBuffer::Strong(buffer) = open_buffer {
1198                    *open_buffer = OpenBuffer::Weak(buffer.downgrade());
1199                }
1200            }
1201
1202            self.client.send(proto::UnshareProject {
1203                project_id: remote_id,
1204            })?;
1205
1206            Ok(())
1207        } else {
1208            Err(anyhow!("attempted to unshare an unshared project"))
1209        }
1210    }
1211
1212    pub fn disconnected_from_host(&mut self, cx: &mut ModelContext<Self>) {
1213        self.disconnected_from_host_internal(cx);
1214        cx.emit(Event::DisconnectedFromHost);
1215        cx.notify();
1216    }
1217
1218    fn disconnected_from_host_internal(&mut self, cx: &mut AppContext) {
1219        if let Some(ProjectClientState::Remote {
1220            sharing_has_stopped,
1221            ..
1222        }) = &mut self.client_state
1223        {
1224            *sharing_has_stopped = true;
1225
1226            self.collaborators.clear();
1227
1228            for worktree in &self.worktrees {
1229                if let Some(worktree) = worktree.upgrade(cx) {
1230                    worktree.update(cx, |worktree, _| {
1231                        if let Some(worktree) = worktree.as_remote_mut() {
1232                            worktree.disconnected_from_host();
1233                        }
1234                    });
1235                }
1236            }
1237
1238            for open_buffer in self.opened_buffers.values_mut() {
1239                // Wake up any tasks waiting for peers' edits to this buffer.
1240                if let Some(buffer) = open_buffer.upgrade(cx) {
1241                    buffer.update(cx, |buffer, _| buffer.give_up_waiting());
1242                }
1243
1244                if let OpenBuffer::Strong(buffer) = open_buffer {
1245                    *open_buffer = OpenBuffer::Weak(buffer.downgrade());
1246                }
1247            }
1248
1249            // Wake up all futures currently waiting on a buffer to get opened,
1250            // to give them a chance to fail now that we've disconnected.
1251            *self.opened_buffer.0.borrow_mut() = ();
1252        }
1253    }
1254
1255    pub fn close(&mut self, cx: &mut ModelContext<Self>) {
1256        cx.emit(Event::Closed);
1257    }
1258
1259    pub fn is_read_only(&self) -> bool {
1260        match &self.client_state {
1261            Some(ProjectClientState::Remote {
1262                sharing_has_stopped,
1263                ..
1264            }) => *sharing_has_stopped,
1265            _ => false,
1266        }
1267    }
1268
1269    pub fn is_local(&self) -> bool {
1270        match &self.client_state {
1271            Some(ProjectClientState::Remote { .. }) => false,
1272            _ => true,
1273        }
1274    }
1275
1276    pub fn is_remote(&self) -> bool {
1277        !self.is_local()
1278    }
1279
1280    pub fn create_buffer(
1281        &mut self,
1282        text: &str,
1283        language: Option<Arc<Language>>,
1284        cx: &mut ModelContext<Self>,
1285    ) -> Result<ModelHandle<Buffer>> {
1286        if self.is_remote() {
1287            return Err(anyhow!("creating buffers as a guest is not supported yet"));
1288        }
1289
1290        let buffer = cx.add_model(|cx| {
1291            Buffer::new(self.replica_id(), text, cx)
1292                .with_language(language.unwrap_or_else(|| language::PLAIN_TEXT.clone()), cx)
1293        });
1294        self.register_buffer(&buffer, cx)?;
1295        Ok(buffer)
1296    }
1297
1298    pub fn open_path(
1299        &mut self,
1300        path: impl Into<ProjectPath>,
1301        cx: &mut ModelContext<Self>,
1302    ) -> Task<Result<(ProjectEntryId, AnyModelHandle)>> {
1303        let task = self.open_buffer(path, cx);
1304        cx.spawn_weak(|_, cx| async move {
1305            let buffer = task.await?;
1306            let project_entry_id = buffer
1307                .read_with(&cx, |buffer, cx| {
1308                    File::from_dyn(buffer.file()).and_then(|file| file.project_entry_id(cx))
1309                })
1310                .ok_or_else(|| anyhow!("no project entry"))?;
1311
1312            let buffer: &AnyModelHandle = &buffer;
1313            Ok((project_entry_id, buffer.clone()))
1314        })
1315    }
1316
1317    pub fn open_local_buffer(
1318        &mut self,
1319        abs_path: impl AsRef<Path>,
1320        cx: &mut ModelContext<Self>,
1321    ) -> Task<Result<ModelHandle<Buffer>>> {
1322        if let Some((worktree, relative_path)) = self.find_local_worktree(abs_path.as_ref(), cx) {
1323            self.open_buffer((worktree.read(cx).id(), relative_path), cx)
1324        } else {
1325            Task::ready(Err(anyhow!("no such path")))
1326        }
1327    }
1328
1329    pub fn open_buffer(
1330        &mut self,
1331        path: impl Into<ProjectPath>,
1332        cx: &mut ModelContext<Self>,
1333    ) -> Task<Result<ModelHandle<Buffer>>> {
1334        let project_path = path.into();
1335        let worktree = if let Some(worktree) = self.worktree_for_id(project_path.worktree_id, cx) {
1336            worktree
1337        } else {
1338            return Task::ready(Err(anyhow!("no such worktree")));
1339        };
1340
1341        // If there is already a buffer for the given path, then return it.
1342        let existing_buffer = self.get_open_buffer(&project_path, cx);
1343        if let Some(existing_buffer) = existing_buffer {
1344            return Task::ready(Ok(existing_buffer));
1345        }
1346
1347        let mut loading_watch = match self.loading_buffers_by_path.entry(project_path.clone()) {
1348            // If the given path is already being loaded, then wait for that existing
1349            // task to complete and return the same buffer.
1350            hash_map::Entry::Occupied(e) => e.get().clone(),
1351
1352            // Otherwise, record the fact that this path is now being loaded.
1353            hash_map::Entry::Vacant(entry) => {
1354                let (mut tx, rx) = postage::watch::channel();
1355                entry.insert(rx.clone());
1356
1357                let load_buffer = if worktree.read(cx).is_local() {
1358                    self.open_local_buffer_internal(&project_path.path, &worktree, cx)
1359                } else {
1360                    self.open_remote_buffer_internal(&project_path.path, &worktree, cx)
1361                };
1362
1363                cx.spawn(move |this, mut cx| async move {
1364                    let load_result = load_buffer.await;
1365                    *tx.borrow_mut() = Some(this.update(&mut cx, |this, _| {
1366                        // Record the fact that the buffer is no longer loading.
1367                        this.loading_buffers_by_path.remove(&project_path);
1368                        let buffer = load_result.map_err(Arc::new)?;
1369                        Ok(buffer)
1370                    }));
1371                })
1372                .detach();
1373                rx
1374            }
1375        };
1376
1377        cx.foreground().spawn(async move {
1378            loop {
1379                if let Some(result) = loading_watch.borrow().as_ref() {
1380                    match result {
1381                        Ok(buffer) => return Ok(buffer.clone()),
1382                        Err(error) => return Err(anyhow!("{}", error)),
1383                    }
1384                }
1385                loading_watch.next().await;
1386            }
1387        })
1388    }
1389
1390    fn open_local_buffer_internal(
1391        &mut self,
1392        path: &Arc<Path>,
1393        worktree: &ModelHandle<Worktree>,
1394        cx: &mut ModelContext<Self>,
1395    ) -> Task<Result<ModelHandle<Buffer>>> {
1396        let load_buffer = worktree.update(cx, |worktree, cx| {
1397            let worktree = worktree.as_local_mut().unwrap();
1398            worktree.load_buffer(path, cx)
1399        });
1400        cx.spawn(|this, mut cx| async move {
1401            let buffer = load_buffer.await?;
1402            this.update(&mut cx, |this, cx| this.register_buffer(&buffer, cx))?;
1403            Ok(buffer)
1404        })
1405    }
1406
1407    fn open_remote_buffer_internal(
1408        &mut self,
1409        path: &Arc<Path>,
1410        worktree: &ModelHandle<Worktree>,
1411        cx: &mut ModelContext<Self>,
1412    ) -> Task<Result<ModelHandle<Buffer>>> {
1413        let rpc = self.client.clone();
1414        let project_id = self.remote_id().unwrap();
1415        let remote_worktree_id = worktree.read(cx).id();
1416        let path = path.clone();
1417        let path_string = path.to_string_lossy().to_string();
1418        cx.spawn(|this, mut cx| async move {
1419            let response = rpc
1420                .request(proto::OpenBufferByPath {
1421                    project_id,
1422                    worktree_id: remote_worktree_id.to_proto(),
1423                    path: path_string,
1424                })
1425                .await?;
1426            this.update(&mut cx, |this, cx| {
1427                this.wait_for_remote_buffer(response.buffer_id, cx)
1428            })
1429            .await
1430        })
1431    }
1432
1433    /// LanguageServerName is owned, because it is inserted into a map
1434    fn open_local_buffer_via_lsp(
1435        &mut self,
1436        abs_path: lsp::Url,
1437        language_server_id: usize,
1438        language_server_name: LanguageServerName,
1439        cx: &mut ModelContext<Self>,
1440    ) -> Task<Result<ModelHandle<Buffer>>> {
1441        cx.spawn(|this, mut cx| async move {
1442            let abs_path = abs_path
1443                .to_file_path()
1444                .map_err(|_| anyhow!("can't convert URI to path"))?;
1445            let (worktree, relative_path) = if let Some(result) =
1446                this.read_with(&cx, |this, cx| this.find_local_worktree(&abs_path, cx))
1447            {
1448                result
1449            } else {
1450                let worktree = this
1451                    .update(&mut cx, |this, cx| {
1452                        this.create_local_worktree(&abs_path, false, cx)
1453                    })
1454                    .await?;
1455                this.update(&mut cx, |this, cx| {
1456                    this.language_server_ids.insert(
1457                        (worktree.read(cx).id(), language_server_name),
1458                        language_server_id,
1459                    );
1460                });
1461                (worktree, PathBuf::new())
1462            };
1463
1464            let project_path = ProjectPath {
1465                worktree_id: worktree.read_with(&cx, |worktree, _| worktree.id()),
1466                path: relative_path.into(),
1467            };
1468            this.update(&mut cx, |this, cx| this.open_buffer(project_path, cx))
1469                .await
1470        })
1471    }
1472
1473    pub fn open_buffer_by_id(
1474        &mut self,
1475        id: u64,
1476        cx: &mut ModelContext<Self>,
1477    ) -> Task<Result<ModelHandle<Buffer>>> {
1478        if let Some(buffer) = self.buffer_for_id(id, cx) {
1479            Task::ready(Ok(buffer))
1480        } else if self.is_local() {
1481            Task::ready(Err(anyhow!("buffer {} does not exist", id)))
1482        } else if let Some(project_id) = self.remote_id() {
1483            let request = self
1484                .client
1485                .request(proto::OpenBufferById { project_id, id });
1486            cx.spawn(|this, mut cx| async move {
1487                let buffer_id = request.await?.buffer_id;
1488                this.update(&mut cx, |this, cx| {
1489                    this.wait_for_remote_buffer(buffer_id, cx)
1490                })
1491                .await
1492            })
1493        } else {
1494            Task::ready(Err(anyhow!("cannot open buffer while disconnected")))
1495        }
1496    }
1497
1498    pub fn save_buffers(
1499        &self,
1500        buffers: HashSet<ModelHandle<Buffer>>,
1501        cx: &mut ModelContext<Self>,
1502    ) -> Task<Result<()>> {
1503        cx.spawn(|this, mut cx| async move {
1504            let save_tasks = buffers
1505                .into_iter()
1506                .map(|buffer| this.update(&mut cx, |this, cx| this.save_buffer(buffer, cx)));
1507            try_join_all(save_tasks).await?;
1508            Ok(())
1509        })
1510    }
1511
1512    pub fn save_buffer(
1513        &self,
1514        buffer: ModelHandle<Buffer>,
1515        cx: &mut ModelContext<Self>,
1516    ) -> Task<Result<(clock::Global, RopeFingerprint, SystemTime)>> {
1517        let Some(file) = File::from_dyn(buffer.read(cx).file()) else {
1518            return Task::ready(Err(anyhow!("buffer doesn't have a file")));
1519        };
1520        let worktree = file.worktree.clone();
1521        let path = file.path.clone();
1522        worktree.update(cx, |worktree, cx| match worktree {
1523            Worktree::Local(worktree) => worktree.save_buffer(buffer, path, false, cx),
1524            Worktree::Remote(worktree) => worktree.save_buffer(buffer, cx),
1525        })
1526    }
1527
1528    pub fn save_buffer_as(
1529        &mut self,
1530        buffer: ModelHandle<Buffer>,
1531        abs_path: PathBuf,
1532        cx: &mut ModelContext<Self>,
1533    ) -> Task<Result<()>> {
1534        let worktree_task = self.find_or_create_local_worktree(&abs_path, true, cx);
1535        let old_path =
1536            File::from_dyn(buffer.read(cx).file()).and_then(|f| Some(f.as_local()?.abs_path(cx)));
1537        cx.spawn(|this, mut cx| async move {
1538            if let Some(old_path) = old_path {
1539                this.update(&mut cx, |this, cx| {
1540                    this.unregister_buffer_from_language_server(&buffer, old_path, cx);
1541                });
1542            }
1543            let (worktree, path) = worktree_task.await?;
1544            worktree
1545                .update(&mut cx, |worktree, cx| match worktree {
1546                    Worktree::Local(worktree) => {
1547                        worktree.save_buffer(buffer.clone(), path.into(), true, cx)
1548                    }
1549                    Worktree::Remote(_) => panic!("cannot remote buffers as new files"),
1550                })
1551                .await?;
1552            this.update(&mut cx, |this, cx| {
1553                this.detect_language_for_buffer(&buffer, cx);
1554                this.register_buffer_with_language_server(&buffer, cx);
1555            });
1556            Ok(())
1557        })
1558    }
1559
1560    pub fn get_open_buffer(
1561        &mut self,
1562        path: &ProjectPath,
1563        cx: &mut ModelContext<Self>,
1564    ) -> Option<ModelHandle<Buffer>> {
1565        let worktree = self.worktree_for_id(path.worktree_id, cx)?;
1566        self.opened_buffers.values().find_map(|buffer| {
1567            let buffer = buffer.upgrade(cx)?;
1568            let file = File::from_dyn(buffer.read(cx).file())?;
1569            if file.worktree == worktree && file.path() == &path.path {
1570                Some(buffer)
1571            } else {
1572                None
1573            }
1574        })
1575    }
1576
1577    fn register_buffer(
1578        &mut self,
1579        buffer: &ModelHandle<Buffer>,
1580        cx: &mut ModelContext<Self>,
1581    ) -> Result<()> {
1582        buffer.update(cx, |buffer, _| {
1583            buffer.set_language_registry(self.languages.clone())
1584        });
1585
1586        let remote_id = buffer.read(cx).remote_id();
1587        let is_remote = self.is_remote();
1588        let open_buffer = if is_remote || self.is_shared() {
1589            OpenBuffer::Strong(buffer.clone())
1590        } else {
1591            OpenBuffer::Weak(buffer.downgrade())
1592        };
1593
1594        match self.opened_buffers.entry(remote_id) {
1595            hash_map::Entry::Vacant(entry) => {
1596                entry.insert(open_buffer);
1597            }
1598            hash_map::Entry::Occupied(mut entry) => {
1599                if let OpenBuffer::Operations(operations) = entry.get_mut() {
1600                    buffer.update(cx, |b, cx| b.apply_ops(operations.drain(..), cx))?;
1601                } else if entry.get().upgrade(cx).is_some() {
1602                    if is_remote {
1603                        return Ok(());
1604                    } else {
1605                        debug_panic!("buffer {} was already registered", remote_id);
1606                        Err(anyhow!("buffer {} was already registered", remote_id))?;
1607                    }
1608                }
1609                entry.insert(open_buffer);
1610            }
1611        }
1612        cx.subscribe(buffer, |this, buffer, event, cx| {
1613            this.on_buffer_event(buffer, event, cx);
1614        })
1615        .detach();
1616
1617        self.detect_language_for_buffer(buffer, cx);
1618        self.register_buffer_with_language_server(buffer, cx);
1619        cx.observe_release(buffer, |this, buffer, cx| {
1620            if let Some(file) = File::from_dyn(buffer.file()) {
1621                if file.is_local() {
1622                    let uri = lsp::Url::from_file_path(file.abs_path(cx)).unwrap();
1623                    if let Some((_, server)) = this.language_server_for_buffer(buffer, cx) {
1624                        server
1625                            .notify::<lsp::notification::DidCloseTextDocument>(
1626                                lsp::DidCloseTextDocumentParams {
1627                                    text_document: lsp::TextDocumentIdentifier::new(uri),
1628                                },
1629                            )
1630                            .log_err();
1631                    }
1632                }
1633            }
1634        })
1635        .detach();
1636
1637        *self.opened_buffer.0.borrow_mut() = ();
1638        Ok(())
1639    }
1640
1641    fn register_buffer_with_language_server(
1642        &mut self,
1643        buffer_handle: &ModelHandle<Buffer>,
1644        cx: &mut ModelContext<Self>,
1645    ) {
1646        let buffer = buffer_handle.read(cx);
1647        let buffer_id = buffer.remote_id();
1648        if let Some(file) = File::from_dyn(buffer.file()) {
1649            if file.is_local() {
1650                let uri = lsp::Url::from_file_path(file.abs_path(cx)).unwrap();
1651                let initial_snapshot = buffer.text_snapshot();
1652
1653                let mut language_server = None;
1654                let mut language_id = None;
1655                if let Some(language) = buffer.language() {
1656                    let worktree_id = file.worktree_id(cx);
1657                    if let Some(adapter) = language.lsp_adapter() {
1658                        language_id = adapter.language_ids.get(language.name().as_ref()).cloned();
1659                        language_server = self
1660                            .language_server_ids
1661                            .get(&(worktree_id, adapter.name.clone()))
1662                            .and_then(|id| self.language_servers.get(id))
1663                            .and_then(|server_state| {
1664                                if let LanguageServerState::Running { server, .. } = server_state {
1665                                    Some(server.clone())
1666                                } else {
1667                                    None
1668                                }
1669                            });
1670                    }
1671                }
1672
1673                if let Some(local_worktree) = file.worktree.read(cx).as_local() {
1674                    if let Some(diagnostics) = local_worktree.diagnostics_for_path(file.path()) {
1675                        self.update_buffer_diagnostics(buffer_handle, diagnostics, None, cx)
1676                            .log_err();
1677                    }
1678                }
1679
1680                if let Some(server) = language_server {
1681                    server
1682                        .notify::<lsp::notification::DidOpenTextDocument>(
1683                            lsp::DidOpenTextDocumentParams {
1684                                text_document: lsp::TextDocumentItem::new(
1685                                    uri,
1686                                    language_id.unwrap_or_default(),
1687                                    0,
1688                                    initial_snapshot.text(),
1689                                ),
1690                            },
1691                        )
1692                        .log_err();
1693                    buffer_handle.update(cx, |buffer, cx| {
1694                        buffer.set_completion_triggers(
1695                            server
1696                                .capabilities()
1697                                .completion_provider
1698                                .as_ref()
1699                                .and_then(|provider| provider.trigger_characters.clone())
1700                                .unwrap_or_default(),
1701                            cx,
1702                        )
1703                    });
1704                    self.buffer_snapshots
1705                        .insert(buffer_id, vec![(0, initial_snapshot)]);
1706                }
1707            }
1708        }
1709    }
1710
1711    fn unregister_buffer_from_language_server(
1712        &mut self,
1713        buffer: &ModelHandle<Buffer>,
1714        old_path: PathBuf,
1715        cx: &mut ModelContext<Self>,
1716    ) {
1717        buffer.update(cx, |buffer, cx| {
1718            buffer.update_diagnostics(Default::default(), cx);
1719            self.buffer_snapshots.remove(&buffer.remote_id());
1720            if let Some((_, language_server)) = self.language_server_for_buffer(buffer, cx) {
1721                language_server
1722                    .notify::<lsp::notification::DidCloseTextDocument>(
1723                        lsp::DidCloseTextDocumentParams {
1724                            text_document: lsp::TextDocumentIdentifier::new(
1725                                lsp::Url::from_file_path(old_path).unwrap(),
1726                            ),
1727                        },
1728                    )
1729                    .log_err();
1730            }
1731        });
1732    }
1733
1734    async fn send_buffer_messages(
1735        this: WeakModelHandle<Self>,
1736        rx: UnboundedReceiver<BufferMessage>,
1737        mut cx: AsyncAppContext,
1738    ) -> Option<()> {
1739        const MAX_BATCH_SIZE: usize = 128;
1740
1741        let mut needs_resync_with_host = false;
1742        let mut operations_by_buffer_id = HashMap::default();
1743        let mut changes = rx.ready_chunks(MAX_BATCH_SIZE);
1744        while let Some(changes) = changes.next().await {
1745            let this = this.upgrade(&mut cx)?;
1746            let is_local = this.read_with(&cx, |this, _| this.is_local());
1747
1748            for change in changes {
1749                match change {
1750                    BufferMessage::Operation {
1751                        buffer_id,
1752                        operation,
1753                    } => {
1754                        if needs_resync_with_host {
1755                            continue;
1756                        }
1757
1758                        operations_by_buffer_id
1759                            .entry(buffer_id)
1760                            .or_insert(Vec::new())
1761                            .push(operation);
1762                    }
1763                    BufferMessage::Resync => {
1764                        operations_by_buffer_id.clear();
1765                        if this
1766                            .update(&mut cx, |this, cx| this.synchronize_remote_buffers(cx))
1767                            .await
1768                            .is_ok()
1769                        {
1770                            needs_resync_with_host = false;
1771                        }
1772                    }
1773                }
1774            }
1775
1776            for (buffer_id, operations) in operations_by_buffer_id.drain() {
1777                let request = this.read_with(&cx, |this, _| {
1778                    let project_id = this.remote_id()?;
1779                    Some(this.client.request(proto::UpdateBuffer {
1780                        buffer_id,
1781                        project_id,
1782                        operations,
1783                    }))
1784                });
1785                if let Some(request) = request {
1786                    if request.await.is_err() && !is_local {
1787                        needs_resync_with_host = true;
1788                        break;
1789                    }
1790                }
1791            }
1792        }
1793
1794        None
1795    }
1796
1797    fn on_buffer_event(
1798        &mut self,
1799        buffer: ModelHandle<Buffer>,
1800        event: &BufferEvent,
1801        cx: &mut ModelContext<Self>,
1802    ) -> Option<()> {
1803        match event {
1804            BufferEvent::Operation(operation) => {
1805                self.buffer_changes_tx
1806                    .unbounded_send(BufferMessage::Operation {
1807                        buffer_id: buffer.read(cx).remote_id(),
1808                        operation: language::proto::serialize_operation(operation),
1809                    })
1810                    .ok();
1811            }
1812            BufferEvent::Edited { .. } => {
1813                let language_server = self
1814                    .language_server_for_buffer(buffer.read(cx), cx)
1815                    .map(|(_, server)| server.clone())?;
1816                let buffer = buffer.read(cx);
1817                let file = File::from_dyn(buffer.file())?;
1818                let abs_path = file.as_local()?.abs_path(cx);
1819                let uri = lsp::Url::from_file_path(abs_path).unwrap();
1820                let buffer_snapshots = self.buffer_snapshots.get_mut(&buffer.remote_id())?;
1821                let (version, prev_snapshot) = buffer_snapshots.last()?;
1822                let next_snapshot = buffer.text_snapshot();
1823                let next_version = version + 1;
1824
1825                let content_changes = buffer
1826                    .edits_since::<(PointUtf16, usize)>(prev_snapshot.version())
1827                    .map(|edit| {
1828                        let edit_start = edit.new.start.0;
1829                        let edit_end = edit_start + (edit.old.end.0 - edit.old.start.0);
1830                        let new_text = next_snapshot
1831                            .text_for_range(edit.new.start.1..edit.new.end.1)
1832                            .collect();
1833                        lsp::TextDocumentContentChangeEvent {
1834                            range: Some(lsp::Range::new(
1835                                point_to_lsp(edit_start),
1836                                point_to_lsp(edit_end),
1837                            )),
1838                            range_length: None,
1839                            text: new_text,
1840                        }
1841                    })
1842                    .collect();
1843
1844                buffer_snapshots.push((next_version, next_snapshot));
1845
1846                language_server
1847                    .notify::<lsp::notification::DidChangeTextDocument>(
1848                        lsp::DidChangeTextDocumentParams {
1849                            text_document: lsp::VersionedTextDocumentIdentifier::new(
1850                                uri,
1851                                next_version,
1852                            ),
1853                            content_changes,
1854                        },
1855                    )
1856                    .log_err();
1857            }
1858            BufferEvent::Saved => {
1859                let file = File::from_dyn(buffer.read(cx).file())?;
1860                let worktree_id = file.worktree_id(cx);
1861                let abs_path = file.as_local()?.abs_path(cx);
1862                let text_document = lsp::TextDocumentIdentifier {
1863                    uri: lsp::Url::from_file_path(abs_path).unwrap(),
1864                };
1865
1866                for (_, _, server) in self.language_servers_for_worktree(worktree_id) {
1867                    server
1868                        .notify::<lsp::notification::DidSaveTextDocument>(
1869                            lsp::DidSaveTextDocumentParams {
1870                                text_document: text_document.clone(),
1871                                text: None,
1872                            },
1873                        )
1874                        .log_err();
1875                }
1876
1877                let language_server_id = self.language_server_id_for_buffer(buffer.read(cx), cx)?;
1878                if let Some(LanguageServerState::Running {
1879                    adapter,
1880                    simulate_disk_based_diagnostics_completion,
1881                    ..
1882                }) = self.language_servers.get_mut(&language_server_id)
1883                {
1884                    // After saving a buffer using a language server that doesn't provide
1885                    // a disk-based progress token, kick off a timer that will reset every
1886                    // time the buffer is saved. If the timer eventually fires, simulate
1887                    // disk-based diagnostics being finished so that other pieces of UI
1888                    // (e.g., project diagnostics view, diagnostic status bar) can update.
1889                    // We don't emit an event right away because the language server might take
1890                    // some time to publish diagnostics.
1891                    if adapter.disk_based_diagnostics_progress_token.is_none() {
1892                        const DISK_BASED_DIAGNOSTICS_DEBOUNCE: Duration = Duration::from_secs(1);
1893
1894                        let task = cx.spawn_weak(|this, mut cx| async move {
1895                            cx.background().timer(DISK_BASED_DIAGNOSTICS_DEBOUNCE).await;
1896                            if let Some(this) = this.upgrade(&cx) {
1897                                this.update(&mut cx, |this, cx | {
1898                                    this.disk_based_diagnostics_finished(language_server_id, cx);
1899                                    this.broadcast_language_server_update(
1900                                        language_server_id,
1901                                        proto::update_language_server::Variant::DiskBasedDiagnosticsUpdated(
1902                                            proto::LspDiskBasedDiagnosticsUpdated {},
1903                                        ),
1904                                    );
1905                                });
1906                            }
1907                        });
1908                        *simulate_disk_based_diagnostics_completion = Some(task);
1909                    }
1910                }
1911            }
1912            _ => {}
1913        }
1914
1915        None
1916    }
1917
1918    fn language_servers_for_worktree(
1919        &self,
1920        worktree_id: WorktreeId,
1921    ) -> impl Iterator<Item = (&Arc<CachedLspAdapter>, &Arc<Language>, &Arc<LanguageServer>)> {
1922        self.language_server_ids
1923            .iter()
1924            .filter_map(move |((language_server_worktree_id, _), id)| {
1925                if *language_server_worktree_id == worktree_id {
1926                    if let Some(LanguageServerState::Running {
1927                        adapter,
1928                        language,
1929                        server,
1930                        ..
1931                    }) = self.language_servers.get(id)
1932                    {
1933                        return Some((adapter, language, server));
1934                    }
1935                }
1936                None
1937            })
1938    }
1939
1940    fn maintain_buffer_languages(
1941        languages: &LanguageRegistry,
1942        cx: &mut ModelContext<Project>,
1943    ) -> Task<()> {
1944        let mut subscription = languages.subscribe();
1945        cx.spawn_weak(|project, mut cx| async move {
1946            while let Some(()) = subscription.next().await {
1947                if let Some(project) = project.upgrade(&cx) {
1948                    project.update(&mut cx, |project, cx| {
1949                        let mut plain_text_buffers = Vec::new();
1950                        let mut buffers_with_unknown_injections = Vec::new();
1951                        for buffer in project.opened_buffers.values() {
1952                            if let Some(handle) = buffer.upgrade(cx) {
1953                                let buffer = &handle.read(cx);
1954                                if buffer.language().is_none()
1955                                    || buffer.language() == Some(&*language::PLAIN_TEXT)
1956                                {
1957                                    plain_text_buffers.push(handle);
1958                                } else if buffer.contains_unknown_injections() {
1959                                    buffers_with_unknown_injections.push(handle);
1960                                }
1961                            }
1962                        }
1963
1964                        for buffer in plain_text_buffers {
1965                            project.detect_language_for_buffer(&buffer, cx);
1966                            project.register_buffer_with_language_server(&buffer, cx);
1967                        }
1968
1969                        for buffer in buffers_with_unknown_injections {
1970                            buffer.update(cx, |buffer, cx| buffer.reparse(cx));
1971                        }
1972                    });
1973                }
1974            }
1975        })
1976    }
1977
1978    fn maintain_workspace_config(
1979        languages: Arc<LanguageRegistry>,
1980        cx: &mut ModelContext<Project>,
1981    ) -> Task<()> {
1982        let (mut settings_changed_tx, mut settings_changed_rx) = watch::channel();
1983        let _ = postage::stream::Stream::try_recv(&mut settings_changed_rx);
1984
1985        let settings_observation = cx.observe_global::<Settings, _>(move |_, _| {
1986            *settings_changed_tx.borrow_mut() = ();
1987        });
1988        cx.spawn_weak(|this, mut cx| async move {
1989            while let Some(_) = settings_changed_rx.next().await {
1990                let workspace_config = cx.update(|cx| languages.workspace_configuration(cx)).await;
1991                if let Some(this) = this.upgrade(&cx) {
1992                    this.read_with(&cx, |this, _| {
1993                        for server_state in this.language_servers.values() {
1994                            if let LanguageServerState::Running { server, .. } = server_state {
1995                                server
1996                                    .notify::<lsp::notification::DidChangeConfiguration>(
1997                                        lsp::DidChangeConfigurationParams {
1998                                            settings: workspace_config.clone(),
1999                                        },
2000                                    )
2001                                    .ok();
2002                            }
2003                        }
2004                    })
2005                } else {
2006                    break;
2007                }
2008            }
2009
2010            drop(settings_observation);
2011        })
2012    }
2013
2014    fn detect_language_for_buffer(
2015        &mut self,
2016        buffer_handle: &ModelHandle<Buffer>,
2017        cx: &mut ModelContext<Self>,
2018    ) -> Option<()> {
2019        // If the buffer has a language, set it and start the language server if we haven't already.
2020        let buffer = buffer_handle.read(cx);
2021        let full_path = buffer.file()?.full_path(cx);
2022        let content = buffer.as_rope();
2023        let new_language = self
2024            .languages
2025            .language_for_file(&full_path, Some(content))
2026            .now_or_never()?
2027            .ok()?;
2028        self.set_language_for_buffer(buffer_handle, new_language, cx);
2029        None
2030    }
2031
2032    pub fn set_language_for_buffer(
2033        &mut self,
2034        buffer: &ModelHandle<Buffer>,
2035        new_language: Arc<Language>,
2036        cx: &mut ModelContext<Self>,
2037    ) {
2038        buffer.update(cx, |buffer, cx| {
2039            if buffer.language().map_or(true, |old_language| {
2040                !Arc::ptr_eq(old_language, &new_language)
2041            }) {
2042                buffer.set_language(Some(new_language.clone()), cx);
2043            }
2044        });
2045
2046        if let Some(file) = File::from_dyn(buffer.read(cx).file()) {
2047            if let Some(worktree) = file.worktree.read(cx).as_local() {
2048                let worktree_id = worktree.id();
2049                let worktree_abs_path = worktree.abs_path().clone();
2050                self.start_language_server(worktree_id, worktree_abs_path, new_language, cx);
2051            }
2052        }
2053    }
2054
2055    fn start_language_server(
2056        &mut self,
2057        worktree_id: WorktreeId,
2058        worktree_path: Arc<Path>,
2059        language: Arc<Language>,
2060        cx: &mut ModelContext<Self>,
2061    ) {
2062        if !cx
2063            .global::<Settings>()
2064            .enable_language_server(Some(&language.name()))
2065        {
2066            return;
2067        }
2068
2069        let adapter = if let Some(adapter) = language.lsp_adapter() {
2070            adapter
2071        } else {
2072            return;
2073        };
2074        let key = (worktree_id, adapter.name.clone());
2075
2076        let mut initialization_options = adapter.initialization_options.clone();
2077
2078        let lsp = &cx.global::<Settings>().lsp.get(&adapter.name.0);
2079        let override_options = lsp.map(|s| s.initialization_options.clone()).flatten();
2080        match (&mut initialization_options, override_options) {
2081            (Some(initialization_options), Some(override_options)) => {
2082                merge_json_value_into(override_options, initialization_options);
2083            }
2084            (None, override_options) => initialization_options = override_options,
2085            _ => {}
2086        }
2087
2088        self.language_server_ids
2089            .entry(key.clone())
2090            .or_insert_with(|| {
2091                let languages = self.languages.clone();
2092                let server_id = post_inc(&mut self.next_language_server_id);
2093                let language_server = self.languages.start_language_server(
2094                    server_id,
2095                    language.clone(),
2096                    worktree_path,
2097                    self.client.http_client(),
2098                    cx,
2099                );
2100                self.language_servers.insert(
2101                    server_id,
2102                    LanguageServerState::Starting(cx.spawn_weak(|this, mut cx| async move {
2103                        let workspace_config =
2104                            cx.update(|cx| languages.workspace_configuration(cx)).await;
2105                        let language_server = language_server?.await.log_err()?;
2106                        let language_server = language_server
2107                            .initialize(initialization_options)
2108                            .await
2109                            .log_err()?;
2110                        let this = this.upgrade(&cx)?;
2111
2112                        language_server
2113                            .on_notification::<lsp::notification::PublishDiagnostics, _>({
2114                                let this = this.downgrade();
2115                                let adapter = adapter.clone();
2116                                move |mut params, cx| {
2117                                    let this = this;
2118                                    let adapter = adapter.clone();
2119                                    cx.spawn(|mut cx| async move {
2120                                        adapter.process_diagnostics(&mut params).await;
2121                                        if let Some(this) = this.upgrade(&cx) {
2122                                            this.update(&mut cx, |this, cx| {
2123                                                this.update_diagnostics(
2124                                                    server_id,
2125                                                    params,
2126                                                    &adapter.disk_based_diagnostic_sources,
2127                                                    cx,
2128                                                )
2129                                                .log_err();
2130                                            });
2131                                        }
2132                                    })
2133                                    .detach();
2134                                }
2135                            })
2136                            .detach();
2137
2138                        language_server
2139                            .on_request::<lsp::request::WorkspaceConfiguration, _, _>({
2140                                let languages = languages.clone();
2141                                move |params, mut cx| {
2142                                    let languages = languages.clone();
2143                                    async move {
2144                                        let workspace_config = cx
2145                                            .update(|cx| languages.workspace_configuration(cx))
2146                                            .await;
2147                                        Ok(params
2148                                            .items
2149                                            .into_iter()
2150                                            .map(|item| {
2151                                                if let Some(section) = &item.section {
2152                                                    workspace_config
2153                                                        .get(section)
2154                                                        .cloned()
2155                                                        .unwrap_or(serde_json::Value::Null)
2156                                                } else {
2157                                                    workspace_config.clone()
2158                                                }
2159                                            })
2160                                            .collect())
2161                                    }
2162                                }
2163                            })
2164                            .detach();
2165
2166                        // Even though we don't have handling for these requests, respond to them to
2167                        // avoid stalling any language server like `gopls` which waits for a response
2168                        // to these requests when initializing.
2169                        language_server
2170                            .on_request::<lsp::request::WorkDoneProgressCreate, _, _>({
2171                                let this = this.downgrade();
2172                                move |params, mut cx| async move {
2173                                    if let Some(this) = this.upgrade(&cx) {
2174                                        this.update(&mut cx, |this, _| {
2175                                            if let Some(status) =
2176                                                this.language_server_statuses.get_mut(&server_id)
2177                                            {
2178                                                if let lsp::NumberOrString::String(token) =
2179                                                    params.token
2180                                                {
2181                                                    status.progress_tokens.insert(token);
2182                                                }
2183                                            }
2184                                        });
2185                                    }
2186                                    Ok(())
2187                                }
2188                            })
2189                            .detach();
2190                        language_server
2191                            .on_request::<lsp::request::RegisterCapability, _, _>({
2192                                let this = this.downgrade();
2193                                move |params, mut cx| async move {
2194                                    let this = this
2195                                        .upgrade(&cx)
2196                                        .ok_or_else(|| anyhow!("project dropped"))?;
2197                                    for reg in params.registrations {
2198                                        if reg.method == "workspace/didChangeWatchedFiles" {
2199                                            if let Some(options) = reg.register_options {
2200                                                let options = serde_json::from_value(options)?;
2201                                                this.update(&mut cx, |this, cx| {
2202                                                    this.on_lsp_did_change_watched_files(
2203                                                        server_id, options, cx,
2204                                                    );
2205                                                });
2206                                            }
2207                                        }
2208                                    }
2209                                    Ok(())
2210                                }
2211                            })
2212                            .detach();
2213
2214                        language_server
2215                            .on_request::<lsp::request::ApplyWorkspaceEdit, _, _>({
2216                                let this = this.downgrade();
2217                                let adapter = adapter.clone();
2218                                let language_server = language_server.clone();
2219                                move |params, cx| {
2220                                    Self::on_lsp_workspace_edit(
2221                                        this,
2222                                        params,
2223                                        server_id,
2224                                        adapter.clone(),
2225                                        language_server.clone(),
2226                                        cx,
2227                                    )
2228                                }
2229                            })
2230                            .detach();
2231
2232                        let disk_based_diagnostics_progress_token =
2233                            adapter.disk_based_diagnostics_progress_token.clone();
2234
2235                        language_server
2236                            .on_notification::<lsp::notification::Progress, _>({
2237                                let this = this.downgrade();
2238                                move |params, mut cx| {
2239                                    if let Some(this) = this.upgrade(&cx) {
2240                                        this.update(&mut cx, |this, cx| {
2241                                            this.on_lsp_progress(
2242                                                params,
2243                                                server_id,
2244                                                disk_based_diagnostics_progress_token.clone(),
2245                                                cx,
2246                                            );
2247                                        });
2248                                    }
2249                                }
2250                            })
2251                            .detach();
2252
2253                        language_server
2254                            .notify::<lsp::notification::DidChangeConfiguration>(
2255                                lsp::DidChangeConfigurationParams {
2256                                    settings: workspace_config,
2257                                },
2258                            )
2259                            .ok();
2260
2261                        this.update(&mut cx, |this, cx| {
2262                            // If the language server for this key doesn't match the server id, don't store the
2263                            // server. Which will cause it to be dropped, killing the process
2264                            if this
2265                                .language_server_ids
2266                                .get(&key)
2267                                .map(|id| id != &server_id)
2268                                .unwrap_or(false)
2269                            {
2270                                return None;
2271                            }
2272
2273                            // Update language_servers collection with Running variant of LanguageServerState
2274                            // indicating that the server is up and running and ready
2275                            this.language_servers.insert(
2276                                server_id,
2277                                LanguageServerState::Running {
2278                                    adapter: adapter.clone(),
2279                                    language,
2280                                    watched_paths: Default::default(),
2281                                    server: language_server.clone(),
2282                                    simulate_disk_based_diagnostics_completion: None,
2283                                },
2284                            );
2285                            this.language_server_statuses.insert(
2286                                server_id,
2287                                LanguageServerStatus {
2288                                    name: language_server.name().to_string(),
2289                                    pending_work: Default::default(),
2290                                    has_pending_diagnostic_updates: false,
2291                                    progress_tokens: Default::default(),
2292                                },
2293                            );
2294
2295                            if let Some(project_id) = this.remote_id() {
2296                                this.client
2297                                    .send(proto::StartLanguageServer {
2298                                        project_id,
2299                                        server: Some(proto::LanguageServer {
2300                                            id: server_id as u64,
2301                                            name: language_server.name().to_string(),
2302                                        }),
2303                                    })
2304                                    .log_err();
2305                            }
2306
2307                            // Tell the language server about every open buffer in the worktree that matches the language.
2308                            for buffer in this.opened_buffers.values() {
2309                                if let Some(buffer_handle) = buffer.upgrade(cx) {
2310                                    let buffer = buffer_handle.read(cx);
2311                                    let file = if let Some(file) = File::from_dyn(buffer.file()) {
2312                                        file
2313                                    } else {
2314                                        continue;
2315                                    };
2316                                    let language = if let Some(language) = buffer.language() {
2317                                        language
2318                                    } else {
2319                                        continue;
2320                                    };
2321                                    if file.worktree.read(cx).id() != key.0
2322                                        || language.lsp_adapter().map(|a| a.name.clone())
2323                                            != Some(key.1.clone())
2324                                    {
2325                                        continue;
2326                                    }
2327
2328                                    let file = file.as_local()?;
2329                                    let versions = this
2330                                        .buffer_snapshots
2331                                        .entry(buffer.remote_id())
2332                                        .or_insert_with(|| vec![(0, buffer.text_snapshot())]);
2333
2334                                    let (version, initial_snapshot) = versions.last().unwrap();
2335                                    let uri = lsp::Url::from_file_path(file.abs_path(cx)).unwrap();
2336                                    language_server
2337                                        .notify::<lsp::notification::DidOpenTextDocument>(
2338                                            lsp::DidOpenTextDocumentParams {
2339                                                text_document: lsp::TextDocumentItem::new(
2340                                                    uri,
2341                                                    adapter
2342                                                        .language_ids
2343                                                        .get(language.name().as_ref())
2344                                                        .cloned()
2345                                                        .unwrap_or_default(),
2346                                                    *version,
2347                                                    initial_snapshot.text(),
2348                                                ),
2349                                            },
2350                                        )
2351                                        .log_err()?;
2352                                    buffer_handle.update(cx, |buffer, cx| {
2353                                        buffer.set_completion_triggers(
2354                                            language_server
2355                                                .capabilities()
2356                                                .completion_provider
2357                                                .as_ref()
2358                                                .and_then(|provider| {
2359                                                    provider.trigger_characters.clone()
2360                                                })
2361                                                .unwrap_or_default(),
2362                                            cx,
2363                                        )
2364                                    });
2365                                }
2366                            }
2367
2368                            cx.notify();
2369                            Some(language_server)
2370                        })
2371                    })),
2372                );
2373
2374                server_id
2375            });
2376    }
2377
2378    // Returns a list of all of the worktrees which no longer have a language server and the root path
2379    // for the stopped server
2380    fn stop_language_server(
2381        &mut self,
2382        worktree_id: WorktreeId,
2383        adapter_name: LanguageServerName,
2384        cx: &mut ModelContext<Self>,
2385    ) -> Task<(Option<PathBuf>, Vec<WorktreeId>)> {
2386        let key = (worktree_id, adapter_name);
2387        if let Some(server_id) = self.language_server_ids.remove(&key) {
2388            // Remove other entries for this language server as well
2389            let mut orphaned_worktrees = vec![worktree_id];
2390            let other_keys = self.language_server_ids.keys().cloned().collect::<Vec<_>>();
2391            for other_key in other_keys {
2392                if self.language_server_ids.get(&other_key) == Some(&server_id) {
2393                    self.language_server_ids.remove(&other_key);
2394                    orphaned_worktrees.push(other_key.0);
2395                }
2396            }
2397
2398            self.language_server_statuses.remove(&server_id);
2399            cx.notify();
2400
2401            let server_state = self.language_servers.remove(&server_id);
2402            cx.spawn_weak(|this, mut cx| async move {
2403                let mut root_path = None;
2404
2405                let server = match server_state {
2406                    Some(LanguageServerState::Starting(started_language_server)) => {
2407                        started_language_server.await
2408                    }
2409                    Some(LanguageServerState::Running { server, .. }) => Some(server),
2410                    None => None,
2411                };
2412
2413                if let Some(server) = server {
2414                    root_path = Some(server.root_path().clone());
2415                    if let Some(shutdown) = server.shutdown() {
2416                        shutdown.await;
2417                    }
2418                }
2419
2420                if let Some(this) = this.upgrade(&cx) {
2421                    this.update(&mut cx, |this, cx| {
2422                        this.language_server_statuses.remove(&server_id);
2423                        cx.notify();
2424                    });
2425                }
2426
2427                (root_path, orphaned_worktrees)
2428            })
2429        } else {
2430            Task::ready((None, Vec::new()))
2431        }
2432    }
2433
2434    pub fn restart_language_servers_for_buffers(
2435        &mut self,
2436        buffers: impl IntoIterator<Item = ModelHandle<Buffer>>,
2437        cx: &mut ModelContext<Self>,
2438    ) -> Option<()> {
2439        let language_server_lookup_info: HashSet<(WorktreeId, Arc<Path>, Arc<Language>)> = buffers
2440            .into_iter()
2441            .filter_map(|buffer| {
2442                let buffer = buffer.read(cx);
2443                let file = File::from_dyn(buffer.file())?;
2444                let worktree = file.worktree.read(cx).as_local()?;
2445                let full_path = file.full_path(cx);
2446                let language = self
2447                    .languages
2448                    .language_for_file(&full_path, Some(buffer.as_rope()))
2449                    .now_or_never()?
2450                    .ok()?;
2451                Some((worktree.id(), worktree.abs_path().clone(), language))
2452            })
2453            .collect();
2454        for (worktree_id, worktree_abs_path, language) in language_server_lookup_info {
2455            self.restart_language_server(worktree_id, worktree_abs_path, language, cx);
2456        }
2457
2458        None
2459    }
2460
2461    fn restart_language_server(
2462        &mut self,
2463        worktree_id: WorktreeId,
2464        fallback_path: Arc<Path>,
2465        language: Arc<Language>,
2466        cx: &mut ModelContext<Self>,
2467    ) {
2468        let adapter = if let Some(adapter) = language.lsp_adapter() {
2469            adapter
2470        } else {
2471            return;
2472        };
2473
2474        let server_name = adapter.name.clone();
2475        let stop = self.stop_language_server(worktree_id, server_name.clone(), cx);
2476        cx.spawn_weak(|this, mut cx| async move {
2477            let (original_root_path, orphaned_worktrees) = stop.await;
2478            if let Some(this) = this.upgrade(&cx) {
2479                this.update(&mut cx, |this, cx| {
2480                    // Attempt to restart using original server path. Fallback to passed in
2481                    // path if we could not retrieve the root path
2482                    let root_path = original_root_path
2483                        .map(|path_buf| Arc::from(path_buf.as_path()))
2484                        .unwrap_or(fallback_path);
2485
2486                    this.start_language_server(worktree_id, root_path, language, cx);
2487
2488                    // Lookup new server id and set it for each of the orphaned worktrees
2489                    if let Some(new_server_id) = this
2490                        .language_server_ids
2491                        .get(&(worktree_id, server_name.clone()))
2492                        .cloned()
2493                    {
2494                        for orphaned_worktree in orphaned_worktrees {
2495                            this.language_server_ids
2496                                .insert((orphaned_worktree, server_name.clone()), new_server_id);
2497                        }
2498                    }
2499                });
2500            }
2501        })
2502        .detach();
2503    }
2504
2505    fn on_lsp_progress(
2506        &mut self,
2507        progress: lsp::ProgressParams,
2508        server_id: usize,
2509        disk_based_diagnostics_progress_token: Option<String>,
2510        cx: &mut ModelContext<Self>,
2511    ) {
2512        let token = match progress.token {
2513            lsp::NumberOrString::String(token) => token,
2514            lsp::NumberOrString::Number(token) => {
2515                log::info!("skipping numeric progress token {}", token);
2516                return;
2517            }
2518        };
2519        let lsp::ProgressParamsValue::WorkDone(progress) = progress.value;
2520        let language_server_status =
2521            if let Some(status) = self.language_server_statuses.get_mut(&server_id) {
2522                status
2523            } else {
2524                return;
2525            };
2526
2527        if !language_server_status.progress_tokens.contains(&token) {
2528            return;
2529        }
2530
2531        let is_disk_based_diagnostics_progress = disk_based_diagnostics_progress_token
2532            .as_ref()
2533            .map_or(false, |disk_based_token| {
2534                token.starts_with(disk_based_token)
2535            });
2536
2537        match progress {
2538            lsp::WorkDoneProgress::Begin(report) => {
2539                if is_disk_based_diagnostics_progress {
2540                    language_server_status.has_pending_diagnostic_updates = true;
2541                    self.disk_based_diagnostics_started(server_id, cx);
2542                    self.broadcast_language_server_update(
2543                        server_id,
2544                        proto::update_language_server::Variant::DiskBasedDiagnosticsUpdating(
2545                            proto::LspDiskBasedDiagnosticsUpdating {},
2546                        ),
2547                    );
2548                } else {
2549                    self.on_lsp_work_start(
2550                        server_id,
2551                        token.clone(),
2552                        LanguageServerProgress {
2553                            message: report.message.clone(),
2554                            percentage: report.percentage.map(|p| p as usize),
2555                            last_update_at: Instant::now(),
2556                        },
2557                        cx,
2558                    );
2559                    self.broadcast_language_server_update(
2560                        server_id,
2561                        proto::update_language_server::Variant::WorkStart(proto::LspWorkStart {
2562                            token,
2563                            message: report.message,
2564                            percentage: report.percentage.map(|p| p as u32),
2565                        }),
2566                    );
2567                }
2568            }
2569            lsp::WorkDoneProgress::Report(report) => {
2570                if !is_disk_based_diagnostics_progress {
2571                    self.on_lsp_work_progress(
2572                        server_id,
2573                        token.clone(),
2574                        LanguageServerProgress {
2575                            message: report.message.clone(),
2576                            percentage: report.percentage.map(|p| p as usize),
2577                            last_update_at: Instant::now(),
2578                        },
2579                        cx,
2580                    );
2581                    self.broadcast_language_server_update(
2582                        server_id,
2583                        proto::update_language_server::Variant::WorkProgress(
2584                            proto::LspWorkProgress {
2585                                token,
2586                                message: report.message,
2587                                percentage: report.percentage.map(|p| p as u32),
2588                            },
2589                        ),
2590                    );
2591                }
2592            }
2593            lsp::WorkDoneProgress::End(_) => {
2594                language_server_status.progress_tokens.remove(&token);
2595
2596                if is_disk_based_diagnostics_progress {
2597                    language_server_status.has_pending_diagnostic_updates = false;
2598                    self.disk_based_diagnostics_finished(server_id, cx);
2599                    self.broadcast_language_server_update(
2600                        server_id,
2601                        proto::update_language_server::Variant::DiskBasedDiagnosticsUpdated(
2602                            proto::LspDiskBasedDiagnosticsUpdated {},
2603                        ),
2604                    );
2605                } else {
2606                    self.on_lsp_work_end(server_id, token.clone(), cx);
2607                    self.broadcast_language_server_update(
2608                        server_id,
2609                        proto::update_language_server::Variant::WorkEnd(proto::LspWorkEnd {
2610                            token,
2611                        }),
2612                    );
2613                }
2614            }
2615        }
2616    }
2617
2618    fn on_lsp_work_start(
2619        &mut self,
2620        language_server_id: usize,
2621        token: String,
2622        progress: LanguageServerProgress,
2623        cx: &mut ModelContext<Self>,
2624    ) {
2625        if let Some(status) = self.language_server_statuses.get_mut(&language_server_id) {
2626            status.pending_work.insert(token, progress);
2627            cx.notify();
2628        }
2629    }
2630
2631    fn on_lsp_work_progress(
2632        &mut self,
2633        language_server_id: usize,
2634        token: String,
2635        progress: LanguageServerProgress,
2636        cx: &mut ModelContext<Self>,
2637    ) {
2638        if let Some(status) = self.language_server_statuses.get_mut(&language_server_id) {
2639            let entry = status
2640                .pending_work
2641                .entry(token)
2642                .or_insert(LanguageServerProgress {
2643                    message: Default::default(),
2644                    percentage: Default::default(),
2645                    last_update_at: progress.last_update_at,
2646                });
2647            if progress.message.is_some() {
2648                entry.message = progress.message;
2649            }
2650            if progress.percentage.is_some() {
2651                entry.percentage = progress.percentage;
2652            }
2653            entry.last_update_at = progress.last_update_at;
2654            cx.notify();
2655        }
2656    }
2657
2658    fn on_lsp_work_end(
2659        &mut self,
2660        language_server_id: usize,
2661        token: String,
2662        cx: &mut ModelContext<Self>,
2663    ) {
2664        if let Some(status) = self.language_server_statuses.get_mut(&language_server_id) {
2665            status.pending_work.remove(&token);
2666            cx.notify();
2667        }
2668    }
2669
2670    fn on_lsp_did_change_watched_files(
2671        &mut self,
2672        language_server_id: usize,
2673        params: DidChangeWatchedFilesRegistrationOptions,
2674        cx: &mut ModelContext<Self>,
2675    ) {
2676        if let Some(LanguageServerState::Running { watched_paths, .. }) =
2677            self.language_servers.get_mut(&language_server_id)
2678        {
2679            watched_paths.clear();
2680            for watcher in params.watchers {
2681                watched_paths.add_pattern(&watcher.glob_pattern).log_err();
2682            }
2683            cx.notify();
2684        }
2685    }
2686
2687    async fn on_lsp_workspace_edit(
2688        this: WeakModelHandle<Self>,
2689        params: lsp::ApplyWorkspaceEditParams,
2690        server_id: usize,
2691        adapter: Arc<CachedLspAdapter>,
2692        language_server: Arc<LanguageServer>,
2693        mut cx: AsyncAppContext,
2694    ) -> Result<lsp::ApplyWorkspaceEditResponse> {
2695        let this = this
2696            .upgrade(&cx)
2697            .ok_or_else(|| anyhow!("project project closed"))?;
2698        let transaction = Self::deserialize_workspace_edit(
2699            this.clone(),
2700            params.edit,
2701            true,
2702            adapter.clone(),
2703            language_server.clone(),
2704            &mut cx,
2705        )
2706        .await
2707        .log_err();
2708        this.update(&mut cx, |this, _| {
2709            if let Some(transaction) = transaction {
2710                this.last_workspace_edits_by_language_server
2711                    .insert(server_id, transaction);
2712            }
2713        });
2714        Ok(lsp::ApplyWorkspaceEditResponse {
2715            applied: true,
2716            failed_change: None,
2717            failure_reason: None,
2718        })
2719    }
2720
2721    fn broadcast_language_server_update(
2722        &self,
2723        language_server_id: usize,
2724        event: proto::update_language_server::Variant,
2725    ) {
2726        if let Some(project_id) = self.remote_id() {
2727            self.client
2728                .send(proto::UpdateLanguageServer {
2729                    project_id,
2730                    language_server_id: language_server_id as u64,
2731                    variant: Some(event),
2732                })
2733                .log_err();
2734        }
2735    }
2736
2737    pub fn language_server_statuses(
2738        &self,
2739    ) -> impl DoubleEndedIterator<Item = &LanguageServerStatus> {
2740        self.language_server_statuses.values()
2741    }
2742
2743    pub fn update_diagnostics(
2744        &mut self,
2745        language_server_id: usize,
2746        mut params: lsp::PublishDiagnosticsParams,
2747        disk_based_sources: &[String],
2748        cx: &mut ModelContext<Self>,
2749    ) -> Result<()> {
2750        let abs_path = params
2751            .uri
2752            .to_file_path()
2753            .map_err(|_| anyhow!("URI is not a file"))?;
2754        let mut diagnostics = Vec::default();
2755        let mut primary_diagnostic_group_ids = HashMap::default();
2756        let mut sources_by_group_id = HashMap::default();
2757        let mut supporting_diagnostics = HashMap::default();
2758
2759        // Ensure that primary diagnostics are always the most severe
2760        params.diagnostics.sort_by_key(|item| item.severity);
2761
2762        for diagnostic in &params.diagnostics {
2763            let source = diagnostic.source.as_ref();
2764            let code = diagnostic.code.as_ref().map(|code| match code {
2765                lsp::NumberOrString::Number(code) => code.to_string(),
2766                lsp::NumberOrString::String(code) => code.clone(),
2767            });
2768            let range = range_from_lsp(diagnostic.range);
2769            let is_supporting = diagnostic
2770                .related_information
2771                .as_ref()
2772                .map_or(false, |infos| {
2773                    infos.iter().any(|info| {
2774                        primary_diagnostic_group_ids.contains_key(&(
2775                            source,
2776                            code.clone(),
2777                            range_from_lsp(info.location.range),
2778                        ))
2779                    })
2780                });
2781
2782            let is_unnecessary = diagnostic.tags.as_ref().map_or(false, |tags| {
2783                tags.iter().any(|tag| *tag == DiagnosticTag::UNNECESSARY)
2784            });
2785
2786            if is_supporting {
2787                supporting_diagnostics.insert(
2788                    (source, code.clone(), range),
2789                    (diagnostic.severity, is_unnecessary),
2790                );
2791            } else {
2792                let group_id = post_inc(&mut self.next_diagnostic_group_id);
2793                let is_disk_based =
2794                    source.map_or(false, |source| disk_based_sources.contains(source));
2795
2796                sources_by_group_id.insert(group_id, source);
2797                primary_diagnostic_group_ids
2798                    .insert((source, code.clone(), range.clone()), group_id);
2799
2800                diagnostics.push(DiagnosticEntry {
2801                    range,
2802                    diagnostic: Diagnostic {
2803                        code: code.clone(),
2804                        severity: diagnostic.severity.unwrap_or(DiagnosticSeverity::ERROR),
2805                        message: diagnostic.message.clone(),
2806                        group_id,
2807                        is_primary: true,
2808                        is_valid: true,
2809                        is_disk_based,
2810                        is_unnecessary,
2811                    },
2812                });
2813                if let Some(infos) = &diagnostic.related_information {
2814                    for info in infos {
2815                        if info.location.uri == params.uri && !info.message.is_empty() {
2816                            let range = range_from_lsp(info.location.range);
2817                            diagnostics.push(DiagnosticEntry {
2818                                range,
2819                                diagnostic: Diagnostic {
2820                                    code: code.clone(),
2821                                    severity: DiagnosticSeverity::INFORMATION,
2822                                    message: info.message.clone(),
2823                                    group_id,
2824                                    is_primary: false,
2825                                    is_valid: true,
2826                                    is_disk_based,
2827                                    is_unnecessary: false,
2828                                },
2829                            });
2830                        }
2831                    }
2832                }
2833            }
2834        }
2835
2836        for entry in &mut diagnostics {
2837            let diagnostic = &mut entry.diagnostic;
2838            if !diagnostic.is_primary {
2839                let source = *sources_by_group_id.get(&diagnostic.group_id).unwrap();
2840                if let Some(&(severity, is_unnecessary)) = supporting_diagnostics.get(&(
2841                    source,
2842                    diagnostic.code.clone(),
2843                    entry.range.clone(),
2844                )) {
2845                    if let Some(severity) = severity {
2846                        diagnostic.severity = severity;
2847                    }
2848                    diagnostic.is_unnecessary = is_unnecessary;
2849                }
2850            }
2851        }
2852
2853        self.update_diagnostic_entries(
2854            language_server_id,
2855            abs_path,
2856            params.version,
2857            diagnostics,
2858            cx,
2859        )?;
2860        Ok(())
2861    }
2862
2863    pub fn update_diagnostic_entries(
2864        &mut self,
2865        language_server_id: usize,
2866        abs_path: PathBuf,
2867        version: Option<i32>,
2868        diagnostics: Vec<DiagnosticEntry<Unclipped<PointUtf16>>>,
2869        cx: &mut ModelContext<Project>,
2870    ) -> Result<(), anyhow::Error> {
2871        let (worktree, relative_path) = self
2872            .find_local_worktree(&abs_path, cx)
2873            .ok_or_else(|| anyhow!("no worktree found for diagnostics"))?;
2874
2875        let project_path = ProjectPath {
2876            worktree_id: worktree.read(cx).id(),
2877            path: relative_path.into(),
2878        };
2879
2880        if let Some(buffer) = self.get_open_buffer(&project_path, cx) {
2881            self.update_buffer_diagnostics(&buffer, diagnostics.clone(), version, cx)?;
2882        }
2883
2884        let updated = worktree.update(cx, |worktree, cx| {
2885            worktree
2886                .as_local_mut()
2887                .ok_or_else(|| anyhow!("not a local worktree"))?
2888                .update_diagnostics(
2889                    language_server_id,
2890                    project_path.path.clone(),
2891                    diagnostics,
2892                    cx,
2893                )
2894        })?;
2895        if updated {
2896            cx.emit(Event::DiagnosticsUpdated {
2897                language_server_id,
2898                path: project_path,
2899            });
2900        }
2901        Ok(())
2902    }
2903
2904    fn update_buffer_diagnostics(
2905        &mut self,
2906        buffer: &ModelHandle<Buffer>,
2907        mut diagnostics: Vec<DiagnosticEntry<Unclipped<PointUtf16>>>,
2908        version: Option<i32>,
2909        cx: &mut ModelContext<Self>,
2910    ) -> Result<()> {
2911        fn compare_diagnostics(a: &Diagnostic, b: &Diagnostic) -> Ordering {
2912            Ordering::Equal
2913                .then_with(|| b.is_primary.cmp(&a.is_primary))
2914                .then_with(|| a.is_disk_based.cmp(&b.is_disk_based))
2915                .then_with(|| a.severity.cmp(&b.severity))
2916                .then_with(|| a.message.cmp(&b.message))
2917        }
2918
2919        let snapshot = self.buffer_snapshot_for_lsp_version(buffer, version, cx)?;
2920
2921        diagnostics.sort_unstable_by(|a, b| {
2922            Ordering::Equal
2923                .then_with(|| a.range.start.cmp(&b.range.start))
2924                .then_with(|| b.range.end.cmp(&a.range.end))
2925                .then_with(|| compare_diagnostics(&a.diagnostic, &b.diagnostic))
2926        });
2927
2928        let mut sanitized_diagnostics = Vec::new();
2929        let edits_since_save = Patch::new(
2930            snapshot
2931                .edits_since::<Unclipped<PointUtf16>>(buffer.read(cx).saved_version())
2932                .collect(),
2933        );
2934        for entry in diagnostics {
2935            let start;
2936            let end;
2937            if entry.diagnostic.is_disk_based {
2938                // Some diagnostics are based on files on disk instead of buffers'
2939                // current contents. Adjust these diagnostics' ranges to reflect
2940                // any unsaved edits.
2941                start = edits_since_save.old_to_new(entry.range.start);
2942                end = edits_since_save.old_to_new(entry.range.end);
2943            } else {
2944                start = entry.range.start;
2945                end = entry.range.end;
2946            }
2947
2948            let mut range = snapshot.clip_point_utf16(start, Bias::Left)
2949                ..snapshot.clip_point_utf16(end, Bias::Right);
2950
2951            // Expand empty ranges by one codepoint
2952            if range.start == range.end {
2953                // This will be go to the next boundary when being clipped
2954                range.end.column += 1;
2955                range.end = snapshot.clip_point_utf16(Unclipped(range.end), Bias::Right);
2956                if range.start == range.end && range.end.column > 0 {
2957                    range.start.column -= 1;
2958                    range.end = snapshot.clip_point_utf16(Unclipped(range.end), Bias::Left);
2959                }
2960            }
2961
2962            sanitized_diagnostics.push(DiagnosticEntry {
2963                range,
2964                diagnostic: entry.diagnostic,
2965            });
2966        }
2967        drop(edits_since_save);
2968
2969        let set = DiagnosticSet::new(sanitized_diagnostics, &snapshot);
2970        buffer.update(cx, |buffer, cx| buffer.update_diagnostics(set, cx));
2971        Ok(())
2972    }
2973
2974    pub fn reload_buffers(
2975        &self,
2976        buffers: HashSet<ModelHandle<Buffer>>,
2977        push_to_history: bool,
2978        cx: &mut ModelContext<Self>,
2979    ) -> Task<Result<ProjectTransaction>> {
2980        let mut local_buffers = Vec::new();
2981        let mut remote_buffers = None;
2982        for buffer_handle in buffers {
2983            let buffer = buffer_handle.read(cx);
2984            if buffer.is_dirty() {
2985                if let Some(file) = File::from_dyn(buffer.file()) {
2986                    if file.is_local() {
2987                        local_buffers.push(buffer_handle);
2988                    } else {
2989                        remote_buffers.get_or_insert(Vec::new()).push(buffer_handle);
2990                    }
2991                }
2992            }
2993        }
2994
2995        let remote_buffers = self.remote_id().zip(remote_buffers);
2996        let client = self.client.clone();
2997
2998        cx.spawn(|this, mut cx| async move {
2999            let mut project_transaction = ProjectTransaction::default();
3000
3001            if let Some((project_id, remote_buffers)) = remote_buffers {
3002                let response = client
3003                    .request(proto::ReloadBuffers {
3004                        project_id,
3005                        buffer_ids: remote_buffers
3006                            .iter()
3007                            .map(|buffer| buffer.read_with(&cx, |buffer, _| buffer.remote_id()))
3008                            .collect(),
3009                    })
3010                    .await?
3011                    .transaction
3012                    .ok_or_else(|| anyhow!("missing transaction"))?;
3013                project_transaction = this
3014                    .update(&mut cx, |this, cx| {
3015                        this.deserialize_project_transaction(response, push_to_history, cx)
3016                    })
3017                    .await?;
3018            }
3019
3020            for buffer in local_buffers {
3021                let transaction = buffer
3022                    .update(&mut cx, |buffer, cx| buffer.reload(cx))
3023                    .await?;
3024                buffer.update(&mut cx, |buffer, cx| {
3025                    if let Some(transaction) = transaction {
3026                        if !push_to_history {
3027                            buffer.forget_transaction(transaction.id);
3028                        }
3029                        project_transaction.0.insert(cx.handle(), transaction);
3030                    }
3031                });
3032            }
3033
3034            Ok(project_transaction)
3035        })
3036    }
3037
3038    pub fn format(
3039        &self,
3040        buffers: HashSet<ModelHandle<Buffer>>,
3041        push_to_history: bool,
3042        trigger: FormatTrigger,
3043        cx: &mut ModelContext<Project>,
3044    ) -> Task<Result<ProjectTransaction>> {
3045        if self.is_local() {
3046            let mut buffers_with_paths_and_servers = buffers
3047                .into_iter()
3048                .filter_map(|buffer_handle| {
3049                    let buffer = buffer_handle.read(cx);
3050                    let file = File::from_dyn(buffer.file())?;
3051                    let buffer_abs_path = file.as_local().map(|f| f.abs_path(cx));
3052                    let server = self
3053                        .language_server_for_buffer(buffer, cx)
3054                        .map(|s| s.1.clone());
3055                    Some((buffer_handle, buffer_abs_path, server))
3056                })
3057                .collect::<Vec<_>>();
3058
3059            cx.spawn(|this, mut cx| async move {
3060                // Do not allow multiple concurrent formatting requests for the
3061                // same buffer.
3062                this.update(&mut cx, |this, _| {
3063                    buffers_with_paths_and_servers
3064                        .retain(|(buffer, _, _)| this.buffers_being_formatted.insert(buffer.id()));
3065                });
3066
3067                let _cleanup = defer({
3068                    let this = this.clone();
3069                    let mut cx = cx.clone();
3070                    let buffers = &buffers_with_paths_and_servers;
3071                    move || {
3072                        this.update(&mut cx, |this, _| {
3073                            for (buffer, _, _) in buffers {
3074                                this.buffers_being_formatted.remove(&buffer.id());
3075                            }
3076                        });
3077                    }
3078                });
3079
3080                let mut project_transaction = ProjectTransaction::default();
3081                for (buffer, buffer_abs_path, language_server) in &buffers_with_paths_and_servers {
3082                    let (
3083                        format_on_save,
3084                        remove_trailing_whitespace,
3085                        ensure_final_newline,
3086                        formatter,
3087                        tab_size,
3088                    ) = buffer.read_with(&cx, |buffer, cx| {
3089                        let settings = cx.global::<Settings>();
3090                        let language_name = buffer.language().map(|language| language.name());
3091                        (
3092                            settings.format_on_save(language_name.as_deref()),
3093                            settings.remove_trailing_whitespace_on_save(language_name.as_deref()),
3094                            settings.ensure_final_newline_on_save(language_name.as_deref()),
3095                            settings.formatter(language_name.as_deref()),
3096                            settings.tab_size(language_name.as_deref()),
3097                        )
3098                    });
3099
3100                    // First, format buffer's whitespace according to the settings.
3101                    let trailing_whitespace_diff = if remove_trailing_whitespace {
3102                        Some(
3103                            buffer
3104                                .read_with(&cx, |b, cx| b.remove_trailing_whitespace(cx))
3105                                .await,
3106                        )
3107                    } else {
3108                        None
3109                    };
3110                    let whitespace_transaction_id = buffer.update(&mut cx, |buffer, cx| {
3111                        buffer.finalize_last_transaction();
3112                        buffer.start_transaction();
3113                        if let Some(diff) = trailing_whitespace_diff {
3114                            buffer.apply_diff(diff, cx);
3115                        }
3116                        if ensure_final_newline {
3117                            buffer.ensure_final_newline(cx);
3118                        }
3119                        buffer.end_transaction(cx)
3120                    });
3121
3122                    // Currently, formatting operations are represented differently depending on
3123                    // whether they come from a language server or an external command.
3124                    enum FormatOperation {
3125                        Lsp(Vec<(Range<Anchor>, String)>),
3126                        External(Diff),
3127                    }
3128
3129                    // Apply language-specific formatting using either a language server
3130                    // or external command.
3131                    let mut format_operation = None;
3132                    match (formatter, format_on_save) {
3133                        (_, FormatOnSave::Off) if trigger == FormatTrigger::Save => {}
3134
3135                        (Formatter::LanguageServer, FormatOnSave::On | FormatOnSave::Off)
3136                        | (_, FormatOnSave::LanguageServer) => {
3137                            if let Some((language_server, buffer_abs_path)) =
3138                                language_server.as_ref().zip(buffer_abs_path.as_ref())
3139                            {
3140                                format_operation = Some(FormatOperation::Lsp(
3141                                    Self::format_via_lsp(
3142                                        &this,
3143                                        &buffer,
3144                                        buffer_abs_path,
3145                                        &language_server,
3146                                        tab_size,
3147                                        &mut cx,
3148                                    )
3149                                    .await
3150                                    .context("failed to format via language server")?,
3151                                ));
3152                            }
3153                        }
3154
3155                        (
3156                            Formatter::External { command, arguments },
3157                            FormatOnSave::On | FormatOnSave::Off,
3158                        )
3159                        | (_, FormatOnSave::External { command, arguments }) => {
3160                            if let Some(buffer_abs_path) = buffer_abs_path {
3161                                format_operation = Self::format_via_external_command(
3162                                    &buffer,
3163                                    &buffer_abs_path,
3164                                    &command,
3165                                    &arguments,
3166                                    &mut cx,
3167                                )
3168                                .await
3169                                .context(format!(
3170                                    "failed to format via external command {:?}",
3171                                    command
3172                                ))?
3173                                .map(FormatOperation::External);
3174                            }
3175                        }
3176                    };
3177
3178                    buffer.update(&mut cx, |b, cx| {
3179                        // If the buffer had its whitespace formatted and was edited while the language-specific
3180                        // formatting was being computed, avoid applying the language-specific formatting, because
3181                        // it can't be grouped with the whitespace formatting in the undo history.
3182                        if let Some(transaction_id) = whitespace_transaction_id {
3183                            if b.peek_undo_stack()
3184                                .map_or(true, |e| e.transaction_id() != transaction_id)
3185                            {
3186                                format_operation.take();
3187                            }
3188                        }
3189
3190                        // Apply any language-specific formatting, and group the two formatting operations
3191                        // in the buffer's undo history.
3192                        if let Some(operation) = format_operation {
3193                            match operation {
3194                                FormatOperation::Lsp(edits) => {
3195                                    b.edit(edits, None, cx);
3196                                }
3197                                FormatOperation::External(diff) => {
3198                                    b.apply_diff(diff, cx);
3199                                }
3200                            }
3201
3202                            if let Some(transaction_id) = whitespace_transaction_id {
3203                                b.group_until_transaction(transaction_id);
3204                            }
3205                        }
3206
3207                        if let Some(transaction) = b.finalize_last_transaction().cloned() {
3208                            if !push_to_history {
3209                                b.forget_transaction(transaction.id);
3210                            }
3211                            project_transaction.0.insert(buffer.clone(), transaction);
3212                        }
3213                    });
3214                }
3215
3216                Ok(project_transaction)
3217            })
3218        } else {
3219            let remote_id = self.remote_id();
3220            let client = self.client.clone();
3221            cx.spawn(|this, mut cx| async move {
3222                let mut project_transaction = ProjectTransaction::default();
3223                if let Some(project_id) = remote_id {
3224                    let response = client
3225                        .request(proto::FormatBuffers {
3226                            project_id,
3227                            trigger: trigger as i32,
3228                            buffer_ids: buffers
3229                                .iter()
3230                                .map(|buffer| buffer.read_with(&cx, |buffer, _| buffer.remote_id()))
3231                                .collect(),
3232                        })
3233                        .await?
3234                        .transaction
3235                        .ok_or_else(|| anyhow!("missing transaction"))?;
3236                    project_transaction = this
3237                        .update(&mut cx, |this, cx| {
3238                            this.deserialize_project_transaction(response, push_to_history, cx)
3239                        })
3240                        .await?;
3241                }
3242                Ok(project_transaction)
3243            })
3244        }
3245    }
3246
3247    async fn format_via_lsp(
3248        this: &ModelHandle<Self>,
3249        buffer: &ModelHandle<Buffer>,
3250        abs_path: &Path,
3251        language_server: &Arc<LanguageServer>,
3252        tab_size: NonZeroU32,
3253        cx: &mut AsyncAppContext,
3254    ) -> Result<Vec<(Range<Anchor>, String)>> {
3255        let text_document =
3256            lsp::TextDocumentIdentifier::new(lsp::Url::from_file_path(abs_path).unwrap());
3257        let capabilities = &language_server.capabilities();
3258        let lsp_edits = if capabilities
3259            .document_formatting_provider
3260            .as_ref()
3261            .map_or(false, |provider| *provider != lsp::OneOf::Left(false))
3262        {
3263            language_server
3264                .request::<lsp::request::Formatting>(lsp::DocumentFormattingParams {
3265                    text_document,
3266                    options: lsp::FormattingOptions {
3267                        tab_size: tab_size.into(),
3268                        insert_spaces: true,
3269                        insert_final_newline: Some(true),
3270                        ..Default::default()
3271                    },
3272                    work_done_progress_params: Default::default(),
3273                })
3274                .await?
3275        } else if capabilities
3276            .document_range_formatting_provider
3277            .as_ref()
3278            .map_or(false, |provider| *provider != lsp::OneOf::Left(false))
3279        {
3280            let buffer_start = lsp::Position::new(0, 0);
3281            let buffer_end =
3282                buffer.read_with(cx, |buffer, _| point_to_lsp(buffer.max_point_utf16()));
3283            language_server
3284                .request::<lsp::request::RangeFormatting>(lsp::DocumentRangeFormattingParams {
3285                    text_document,
3286                    range: lsp::Range::new(buffer_start, buffer_end),
3287                    options: lsp::FormattingOptions {
3288                        tab_size: tab_size.into(),
3289                        insert_spaces: true,
3290                        insert_final_newline: Some(true),
3291                        ..Default::default()
3292                    },
3293                    work_done_progress_params: Default::default(),
3294                })
3295                .await?
3296        } else {
3297            None
3298        };
3299
3300        if let Some(lsp_edits) = lsp_edits {
3301            this.update(cx, |this, cx| {
3302                this.edits_from_lsp(buffer, lsp_edits, None, cx)
3303            })
3304            .await
3305        } else {
3306            Ok(Default::default())
3307        }
3308    }
3309
3310    async fn format_via_external_command(
3311        buffer: &ModelHandle<Buffer>,
3312        buffer_abs_path: &Path,
3313        command: &str,
3314        arguments: &[String],
3315        cx: &mut AsyncAppContext,
3316    ) -> Result<Option<Diff>> {
3317        let working_dir_path = buffer.read_with(cx, |buffer, cx| {
3318            let file = File::from_dyn(buffer.file())?;
3319            let worktree = file.worktree.read(cx).as_local()?;
3320            let mut worktree_path = worktree.abs_path().to_path_buf();
3321            if worktree.root_entry()?.is_file() {
3322                worktree_path.pop();
3323            }
3324            Some(worktree_path)
3325        });
3326
3327        if let Some(working_dir_path) = working_dir_path {
3328            let mut child =
3329                smol::process::Command::new(command)
3330                    .args(arguments.iter().map(|arg| {
3331                        arg.replace("{buffer_path}", &buffer_abs_path.to_string_lossy())
3332                    }))
3333                    .current_dir(&working_dir_path)
3334                    .stdin(smol::process::Stdio::piped())
3335                    .stdout(smol::process::Stdio::piped())
3336                    .stderr(smol::process::Stdio::piped())
3337                    .spawn()?;
3338            let stdin = child
3339                .stdin
3340                .as_mut()
3341                .ok_or_else(|| anyhow!("failed to acquire stdin"))?;
3342            let text = buffer.read_with(cx, |buffer, _| buffer.as_rope().clone());
3343            for chunk in text.chunks() {
3344                stdin.write_all(chunk.as_bytes()).await?;
3345            }
3346            stdin.flush().await?;
3347
3348            let output = child.output().await?;
3349            if !output.status.success() {
3350                return Err(anyhow!(
3351                    "command failed with exit code {:?}:\nstdout: {}\nstderr: {}",
3352                    output.status.code(),
3353                    String::from_utf8_lossy(&output.stdout),
3354                    String::from_utf8_lossy(&output.stderr),
3355                ));
3356            }
3357
3358            let stdout = String::from_utf8(output.stdout)?;
3359            Ok(Some(
3360                buffer
3361                    .read_with(cx, |buffer, cx| buffer.diff(stdout, cx))
3362                    .await,
3363            ))
3364        } else {
3365            Ok(None)
3366        }
3367    }
3368
3369    pub fn definition<T: ToPointUtf16>(
3370        &self,
3371        buffer: &ModelHandle<Buffer>,
3372        position: T,
3373        cx: &mut ModelContext<Self>,
3374    ) -> Task<Result<Vec<LocationLink>>> {
3375        let position = position.to_point_utf16(buffer.read(cx));
3376        self.request_lsp(buffer.clone(), GetDefinition { position }, cx)
3377    }
3378
3379    pub fn type_definition<T: ToPointUtf16>(
3380        &self,
3381        buffer: &ModelHandle<Buffer>,
3382        position: T,
3383        cx: &mut ModelContext<Self>,
3384    ) -> Task<Result<Vec<LocationLink>>> {
3385        let position = position.to_point_utf16(buffer.read(cx));
3386        self.request_lsp(buffer.clone(), GetTypeDefinition { position }, cx)
3387    }
3388
3389    pub fn references<T: ToPointUtf16>(
3390        &self,
3391        buffer: &ModelHandle<Buffer>,
3392        position: T,
3393        cx: &mut ModelContext<Self>,
3394    ) -> Task<Result<Vec<Location>>> {
3395        let position = position.to_point_utf16(buffer.read(cx));
3396        self.request_lsp(buffer.clone(), GetReferences { position }, cx)
3397    }
3398
3399    pub fn document_highlights<T: ToPointUtf16>(
3400        &self,
3401        buffer: &ModelHandle<Buffer>,
3402        position: T,
3403        cx: &mut ModelContext<Self>,
3404    ) -> Task<Result<Vec<DocumentHighlight>>> {
3405        let position = position.to_point_utf16(buffer.read(cx));
3406        self.request_lsp(buffer.clone(), GetDocumentHighlights { position }, cx)
3407    }
3408
3409    pub fn symbols(&self, query: &str, cx: &mut ModelContext<Self>) -> Task<Result<Vec<Symbol>>> {
3410        if self.is_local() {
3411            let mut requests = Vec::new();
3412            for ((worktree_id, _), server_id) in self.language_server_ids.iter() {
3413                let worktree_id = *worktree_id;
3414                if let Some(worktree) = self
3415                    .worktree_for_id(worktree_id, cx)
3416                    .and_then(|worktree| worktree.read(cx).as_local())
3417                {
3418                    if let Some(LanguageServerState::Running {
3419                        adapter,
3420                        language,
3421                        server,
3422                        ..
3423                    }) = self.language_servers.get(server_id)
3424                    {
3425                        let adapter = adapter.clone();
3426                        let language = language.clone();
3427                        let worktree_abs_path = worktree.abs_path().clone();
3428                        requests.push(
3429                            server
3430                                .request::<lsp::request::WorkspaceSymbol>(
3431                                    lsp::WorkspaceSymbolParams {
3432                                        query: query.to_string(),
3433                                        ..Default::default()
3434                                    },
3435                                )
3436                                .log_err()
3437                                .map(move |response| {
3438                                    (
3439                                        adapter,
3440                                        language,
3441                                        worktree_id,
3442                                        worktree_abs_path,
3443                                        response.unwrap_or_default(),
3444                                    )
3445                                }),
3446                        );
3447                    }
3448                }
3449            }
3450
3451            cx.spawn_weak(|this, cx| async move {
3452                let responses = futures::future::join_all(requests).await;
3453                let this = if let Some(this) = this.upgrade(&cx) {
3454                    this
3455                } else {
3456                    return Ok(Default::default());
3457                };
3458                let symbols = this.read_with(&cx, |this, cx| {
3459                    let mut symbols = Vec::new();
3460                    for (
3461                        adapter,
3462                        adapter_language,
3463                        source_worktree_id,
3464                        worktree_abs_path,
3465                        response,
3466                    ) in responses
3467                    {
3468                        symbols.extend(response.into_iter().flatten().filter_map(|lsp_symbol| {
3469                            let abs_path = lsp_symbol.location.uri.to_file_path().ok()?;
3470                            let mut worktree_id = source_worktree_id;
3471                            let path;
3472                            if let Some((worktree, rel_path)) =
3473                                this.find_local_worktree(&abs_path, cx)
3474                            {
3475                                worktree_id = worktree.read(cx).id();
3476                                path = rel_path;
3477                            } else {
3478                                path = relativize_path(&worktree_abs_path, &abs_path);
3479                            }
3480
3481                            let project_path = ProjectPath {
3482                                worktree_id,
3483                                path: path.into(),
3484                            };
3485                            let signature = this.symbol_signature(&project_path);
3486                            let adapter_language = adapter_language.clone();
3487                            let language = this
3488                                .languages
3489                                .language_for_file(&project_path.path, None)
3490                                .unwrap_or_else(move |_| adapter_language);
3491                            let language_server_name = adapter.name.clone();
3492                            Some(async move {
3493                                let language = language.await;
3494                                let label = language
3495                                    .label_for_symbol(&lsp_symbol.name, lsp_symbol.kind)
3496                                    .await;
3497
3498                                Symbol {
3499                                    language_server_name,
3500                                    source_worktree_id,
3501                                    path: project_path,
3502                                    label: label.unwrap_or_else(|| {
3503                                        CodeLabel::plain(lsp_symbol.name.clone(), None)
3504                                    }),
3505                                    kind: lsp_symbol.kind,
3506                                    name: lsp_symbol.name,
3507                                    range: range_from_lsp(lsp_symbol.location.range),
3508                                    signature,
3509                                }
3510                            })
3511                        }));
3512                    }
3513                    symbols
3514                });
3515                Ok(futures::future::join_all(symbols).await)
3516            })
3517        } else if let Some(project_id) = self.remote_id() {
3518            let request = self.client.request(proto::GetProjectSymbols {
3519                project_id,
3520                query: query.to_string(),
3521            });
3522            cx.spawn_weak(|this, cx| async move {
3523                let response = request.await?;
3524                let mut symbols = Vec::new();
3525                if let Some(this) = this.upgrade(&cx) {
3526                    let new_symbols = this.read_with(&cx, |this, _| {
3527                        response
3528                            .symbols
3529                            .into_iter()
3530                            .map(|symbol| this.deserialize_symbol(symbol))
3531                            .collect::<Vec<_>>()
3532                    });
3533                    symbols = futures::future::join_all(new_symbols)
3534                        .await
3535                        .into_iter()
3536                        .filter_map(|symbol| symbol.log_err())
3537                        .collect::<Vec<_>>();
3538                }
3539                Ok(symbols)
3540            })
3541        } else {
3542            Task::ready(Ok(Default::default()))
3543        }
3544    }
3545
3546    pub fn open_buffer_for_symbol(
3547        &mut self,
3548        symbol: &Symbol,
3549        cx: &mut ModelContext<Self>,
3550    ) -> Task<Result<ModelHandle<Buffer>>> {
3551        if self.is_local() {
3552            let language_server_id = if let Some(id) = self.language_server_ids.get(&(
3553                symbol.source_worktree_id,
3554                symbol.language_server_name.clone(),
3555            )) {
3556                *id
3557            } else {
3558                return Task::ready(Err(anyhow!(
3559                    "language server for worktree and language not found"
3560                )));
3561            };
3562
3563            let worktree_abs_path = if let Some(worktree_abs_path) = self
3564                .worktree_for_id(symbol.path.worktree_id, cx)
3565                .and_then(|worktree| worktree.read(cx).as_local())
3566                .map(|local_worktree| local_worktree.abs_path())
3567            {
3568                worktree_abs_path
3569            } else {
3570                return Task::ready(Err(anyhow!("worktree not found for symbol")));
3571            };
3572            let symbol_abs_path = worktree_abs_path.join(&symbol.path.path);
3573            let symbol_uri = if let Ok(uri) = lsp::Url::from_file_path(symbol_abs_path) {
3574                uri
3575            } else {
3576                return Task::ready(Err(anyhow!("invalid symbol path")));
3577            };
3578
3579            self.open_local_buffer_via_lsp(
3580                symbol_uri,
3581                language_server_id,
3582                symbol.language_server_name.clone(),
3583                cx,
3584            )
3585        } else if let Some(project_id) = self.remote_id() {
3586            let request = self.client.request(proto::OpenBufferForSymbol {
3587                project_id,
3588                symbol: Some(serialize_symbol(symbol)),
3589            });
3590            cx.spawn(|this, mut cx| async move {
3591                let response = request.await?;
3592                this.update(&mut cx, |this, cx| {
3593                    this.wait_for_remote_buffer(response.buffer_id, cx)
3594                })
3595                .await
3596            })
3597        } else {
3598            Task::ready(Err(anyhow!("project does not have a remote id")))
3599        }
3600    }
3601
3602    pub fn hover<T: ToPointUtf16>(
3603        &self,
3604        buffer: &ModelHandle<Buffer>,
3605        position: T,
3606        cx: &mut ModelContext<Self>,
3607    ) -> Task<Result<Option<Hover>>> {
3608        let position = position.to_point_utf16(buffer.read(cx));
3609        self.request_lsp(buffer.clone(), GetHover { position }, cx)
3610    }
3611
3612    pub fn completions<T: ToPointUtf16>(
3613        &self,
3614        buffer: &ModelHandle<Buffer>,
3615        position: T,
3616        cx: &mut ModelContext<Self>,
3617    ) -> Task<Result<Vec<Completion>>> {
3618        let position = position.to_point_utf16(buffer.read(cx));
3619        self.request_lsp(buffer.clone(), GetCompletions { position }, cx)
3620    }
3621
3622    pub fn apply_additional_edits_for_completion(
3623        &self,
3624        buffer_handle: ModelHandle<Buffer>,
3625        completion: Completion,
3626        push_to_history: bool,
3627        cx: &mut ModelContext<Self>,
3628    ) -> Task<Result<Option<Transaction>>> {
3629        let buffer = buffer_handle.read(cx);
3630        let buffer_id = buffer.remote_id();
3631
3632        if self.is_local() {
3633            let lang_server = match self.language_server_for_buffer(buffer, cx) {
3634                Some((_, server)) => server.clone(),
3635                _ => return Task::ready(Ok(Default::default())),
3636            };
3637
3638            cx.spawn(|this, mut cx| async move {
3639                let resolved_completion = lang_server
3640                    .request::<lsp::request::ResolveCompletionItem>(completion.lsp_completion)
3641                    .await?;
3642
3643                if let Some(edits) = resolved_completion.additional_text_edits {
3644                    let edits = this
3645                        .update(&mut cx, |this, cx| {
3646                            this.edits_from_lsp(&buffer_handle, edits, None, cx)
3647                        })
3648                        .await?;
3649
3650                    buffer_handle.update(&mut cx, |buffer, cx| {
3651                        buffer.finalize_last_transaction();
3652                        buffer.start_transaction();
3653
3654                        for (range, text) in edits {
3655                            let primary = &completion.old_range;
3656                            let start_within = primary.start.cmp(&range.start, buffer).is_le()
3657                                && primary.end.cmp(&range.start, buffer).is_ge();
3658                            let end_within = range.start.cmp(&primary.end, buffer).is_le()
3659                                && range.end.cmp(&primary.end, buffer).is_ge();
3660
3661                            //Skip addtional edits which overlap with the primary completion edit
3662                            //https://github.com/zed-industries/zed/pull/1871
3663                            if !start_within && !end_within {
3664                                buffer.edit([(range, text)], None, cx);
3665                            }
3666                        }
3667
3668                        let transaction = if buffer.end_transaction(cx).is_some() {
3669                            let transaction = buffer.finalize_last_transaction().unwrap().clone();
3670                            if !push_to_history {
3671                                buffer.forget_transaction(transaction.id);
3672                            }
3673                            Some(transaction)
3674                        } else {
3675                            None
3676                        };
3677                        Ok(transaction)
3678                    })
3679                } else {
3680                    Ok(None)
3681                }
3682            })
3683        } else if let Some(project_id) = self.remote_id() {
3684            let client = self.client.clone();
3685            cx.spawn(|_, mut cx| async move {
3686                let response = client
3687                    .request(proto::ApplyCompletionAdditionalEdits {
3688                        project_id,
3689                        buffer_id,
3690                        completion: Some(language::proto::serialize_completion(&completion)),
3691                    })
3692                    .await?;
3693
3694                if let Some(transaction) = response.transaction {
3695                    let transaction = language::proto::deserialize_transaction(transaction)?;
3696                    buffer_handle
3697                        .update(&mut cx, |buffer, _| {
3698                            buffer.wait_for_edits(transaction.edit_ids.iter().copied())
3699                        })
3700                        .await?;
3701                    if push_to_history {
3702                        buffer_handle.update(&mut cx, |buffer, _| {
3703                            buffer.push_transaction(transaction.clone(), Instant::now());
3704                        });
3705                    }
3706                    Ok(Some(transaction))
3707                } else {
3708                    Ok(None)
3709                }
3710            })
3711        } else {
3712            Task::ready(Err(anyhow!("project does not have a remote id")))
3713        }
3714    }
3715
3716    pub fn code_actions<T: Clone + ToOffset>(
3717        &self,
3718        buffer_handle: &ModelHandle<Buffer>,
3719        range: Range<T>,
3720        cx: &mut ModelContext<Self>,
3721    ) -> Task<Result<Vec<CodeAction>>> {
3722        let buffer = buffer_handle.read(cx);
3723        let range = buffer.anchor_before(range.start)..buffer.anchor_before(range.end);
3724        self.request_lsp(buffer_handle.clone(), GetCodeActions { range }, cx)
3725    }
3726
3727    pub fn apply_code_action(
3728        &self,
3729        buffer_handle: ModelHandle<Buffer>,
3730        mut action: CodeAction,
3731        push_to_history: bool,
3732        cx: &mut ModelContext<Self>,
3733    ) -> Task<Result<ProjectTransaction>> {
3734        if self.is_local() {
3735            let buffer = buffer_handle.read(cx);
3736            let (lsp_adapter, lang_server) =
3737                if let Some((adapter, server)) = self.language_server_for_buffer(buffer, cx) {
3738                    (adapter.clone(), server.clone())
3739                } else {
3740                    return Task::ready(Ok(Default::default()));
3741                };
3742            let range = action.range.to_point_utf16(buffer);
3743
3744            cx.spawn(|this, mut cx| async move {
3745                if let Some(lsp_range) = action
3746                    .lsp_action
3747                    .data
3748                    .as_mut()
3749                    .and_then(|d| d.get_mut("codeActionParams"))
3750                    .and_then(|d| d.get_mut("range"))
3751                {
3752                    *lsp_range = serde_json::to_value(&range_to_lsp(range)).unwrap();
3753                    action.lsp_action = lang_server
3754                        .request::<lsp::request::CodeActionResolveRequest>(action.lsp_action)
3755                        .await?;
3756                } else {
3757                    let actions = this
3758                        .update(&mut cx, |this, cx| {
3759                            this.code_actions(&buffer_handle, action.range, cx)
3760                        })
3761                        .await?;
3762                    action.lsp_action = actions
3763                        .into_iter()
3764                        .find(|a| a.lsp_action.title == action.lsp_action.title)
3765                        .ok_or_else(|| anyhow!("code action is outdated"))?
3766                        .lsp_action;
3767                }
3768
3769                if let Some(edit) = action.lsp_action.edit {
3770                    if edit.changes.is_some() || edit.document_changes.is_some() {
3771                        return Self::deserialize_workspace_edit(
3772                            this,
3773                            edit,
3774                            push_to_history,
3775                            lsp_adapter.clone(),
3776                            lang_server.clone(),
3777                            &mut cx,
3778                        )
3779                        .await;
3780                    }
3781                }
3782
3783                if let Some(command) = action.lsp_action.command {
3784                    this.update(&mut cx, |this, _| {
3785                        this.last_workspace_edits_by_language_server
3786                            .remove(&lang_server.server_id());
3787                    });
3788                    lang_server
3789                        .request::<lsp::request::ExecuteCommand>(lsp::ExecuteCommandParams {
3790                            command: command.command,
3791                            arguments: command.arguments.unwrap_or_default(),
3792                            ..Default::default()
3793                        })
3794                        .await?;
3795                    return Ok(this.update(&mut cx, |this, _| {
3796                        this.last_workspace_edits_by_language_server
3797                            .remove(&lang_server.server_id())
3798                            .unwrap_or_default()
3799                    }));
3800                }
3801
3802                Ok(ProjectTransaction::default())
3803            })
3804        } else if let Some(project_id) = self.remote_id() {
3805            let client = self.client.clone();
3806            let request = proto::ApplyCodeAction {
3807                project_id,
3808                buffer_id: buffer_handle.read(cx).remote_id(),
3809                action: Some(language::proto::serialize_code_action(&action)),
3810            };
3811            cx.spawn(|this, mut cx| async move {
3812                let response = client
3813                    .request(request)
3814                    .await?
3815                    .transaction
3816                    .ok_or_else(|| anyhow!("missing transaction"))?;
3817                this.update(&mut cx, |this, cx| {
3818                    this.deserialize_project_transaction(response, push_to_history, cx)
3819                })
3820                .await
3821            })
3822        } else {
3823            Task::ready(Err(anyhow!("project does not have a remote id")))
3824        }
3825    }
3826
3827    async fn deserialize_workspace_edit(
3828        this: ModelHandle<Self>,
3829        edit: lsp::WorkspaceEdit,
3830        push_to_history: bool,
3831        lsp_adapter: Arc<CachedLspAdapter>,
3832        language_server: Arc<LanguageServer>,
3833        cx: &mut AsyncAppContext,
3834    ) -> Result<ProjectTransaction> {
3835        let fs = this.read_with(cx, |this, _| this.fs.clone());
3836        let mut operations = Vec::new();
3837        if let Some(document_changes) = edit.document_changes {
3838            match document_changes {
3839                lsp::DocumentChanges::Edits(edits) => {
3840                    operations.extend(edits.into_iter().map(lsp::DocumentChangeOperation::Edit))
3841                }
3842                lsp::DocumentChanges::Operations(ops) => operations = ops,
3843            }
3844        } else if let Some(changes) = edit.changes {
3845            operations.extend(changes.into_iter().map(|(uri, edits)| {
3846                lsp::DocumentChangeOperation::Edit(lsp::TextDocumentEdit {
3847                    text_document: lsp::OptionalVersionedTextDocumentIdentifier {
3848                        uri,
3849                        version: None,
3850                    },
3851                    edits: edits.into_iter().map(lsp::OneOf::Left).collect(),
3852                })
3853            }));
3854        }
3855
3856        let mut project_transaction = ProjectTransaction::default();
3857        for operation in operations {
3858            match operation {
3859                lsp::DocumentChangeOperation::Op(lsp::ResourceOp::Create(op)) => {
3860                    let abs_path = op
3861                        .uri
3862                        .to_file_path()
3863                        .map_err(|_| anyhow!("can't convert URI to path"))?;
3864
3865                    if let Some(parent_path) = abs_path.parent() {
3866                        fs.create_dir(parent_path).await?;
3867                    }
3868                    if abs_path.ends_with("/") {
3869                        fs.create_dir(&abs_path).await?;
3870                    } else {
3871                        fs.create_file(&abs_path, op.options.map(Into::into).unwrap_or_default())
3872                            .await?;
3873                    }
3874                }
3875                lsp::DocumentChangeOperation::Op(lsp::ResourceOp::Rename(op)) => {
3876                    let source_abs_path = op
3877                        .old_uri
3878                        .to_file_path()
3879                        .map_err(|_| anyhow!("can't convert URI to path"))?;
3880                    let target_abs_path = op
3881                        .new_uri
3882                        .to_file_path()
3883                        .map_err(|_| anyhow!("can't convert URI to path"))?;
3884                    fs.rename(
3885                        &source_abs_path,
3886                        &target_abs_path,
3887                        op.options.map(Into::into).unwrap_or_default(),
3888                    )
3889                    .await?;
3890                }
3891                lsp::DocumentChangeOperation::Op(lsp::ResourceOp::Delete(op)) => {
3892                    let abs_path = op
3893                        .uri
3894                        .to_file_path()
3895                        .map_err(|_| anyhow!("can't convert URI to path"))?;
3896                    let options = op.options.map(Into::into).unwrap_or_default();
3897                    if abs_path.ends_with("/") {
3898                        fs.remove_dir(&abs_path, options).await?;
3899                    } else {
3900                        fs.remove_file(&abs_path, options).await?;
3901                    }
3902                }
3903                lsp::DocumentChangeOperation::Edit(op) => {
3904                    let buffer_to_edit = this
3905                        .update(cx, |this, cx| {
3906                            this.open_local_buffer_via_lsp(
3907                                op.text_document.uri,
3908                                language_server.server_id(),
3909                                lsp_adapter.name.clone(),
3910                                cx,
3911                            )
3912                        })
3913                        .await?;
3914
3915                    let edits = this
3916                        .update(cx, |this, cx| {
3917                            let edits = op.edits.into_iter().map(|edit| match edit {
3918                                lsp::OneOf::Left(edit) => edit,
3919                                lsp::OneOf::Right(edit) => edit.text_edit,
3920                            });
3921                            this.edits_from_lsp(
3922                                &buffer_to_edit,
3923                                edits,
3924                                op.text_document.version,
3925                                cx,
3926                            )
3927                        })
3928                        .await?;
3929
3930                    let transaction = buffer_to_edit.update(cx, |buffer, cx| {
3931                        buffer.finalize_last_transaction();
3932                        buffer.start_transaction();
3933                        for (range, text) in edits {
3934                            buffer.edit([(range, text)], None, cx);
3935                        }
3936                        let transaction = if buffer.end_transaction(cx).is_some() {
3937                            let transaction = buffer.finalize_last_transaction().unwrap().clone();
3938                            if !push_to_history {
3939                                buffer.forget_transaction(transaction.id);
3940                            }
3941                            Some(transaction)
3942                        } else {
3943                            None
3944                        };
3945
3946                        transaction
3947                    });
3948                    if let Some(transaction) = transaction {
3949                        project_transaction.0.insert(buffer_to_edit, transaction);
3950                    }
3951                }
3952            }
3953        }
3954
3955        Ok(project_transaction)
3956    }
3957
3958    pub fn prepare_rename<T: ToPointUtf16>(
3959        &self,
3960        buffer: ModelHandle<Buffer>,
3961        position: T,
3962        cx: &mut ModelContext<Self>,
3963    ) -> Task<Result<Option<Range<Anchor>>>> {
3964        let position = position.to_point_utf16(buffer.read(cx));
3965        self.request_lsp(buffer, PrepareRename { position }, cx)
3966    }
3967
3968    pub fn perform_rename<T: ToPointUtf16>(
3969        &self,
3970        buffer: ModelHandle<Buffer>,
3971        position: T,
3972        new_name: String,
3973        push_to_history: bool,
3974        cx: &mut ModelContext<Self>,
3975    ) -> Task<Result<ProjectTransaction>> {
3976        let position = position.to_point_utf16(buffer.read(cx));
3977        self.request_lsp(
3978            buffer,
3979            PerformRename {
3980                position,
3981                new_name,
3982                push_to_history,
3983            },
3984            cx,
3985        )
3986    }
3987
3988    #[allow(clippy::type_complexity)]
3989    pub fn search(
3990        &self,
3991        query: SearchQuery,
3992        cx: &mut ModelContext<Self>,
3993    ) -> Task<Result<HashMap<ModelHandle<Buffer>, Vec<Range<Anchor>>>>> {
3994        if self.is_local() {
3995            let snapshots = self
3996                .visible_worktrees(cx)
3997                .filter_map(|tree| {
3998                    let tree = tree.read(cx).as_local()?;
3999                    Some(tree.snapshot())
4000                })
4001                .collect::<Vec<_>>();
4002
4003            let background = cx.background().clone();
4004            let path_count: usize = snapshots.iter().map(|s| s.visible_file_count()).sum();
4005            if path_count == 0 {
4006                return Task::ready(Ok(Default::default()));
4007            }
4008            let workers = background.num_cpus().min(path_count);
4009            let (matching_paths_tx, mut matching_paths_rx) = smol::channel::bounded(1024);
4010            cx.background()
4011                .spawn({
4012                    let fs = self.fs.clone();
4013                    let background = cx.background().clone();
4014                    let query = query.clone();
4015                    async move {
4016                        let fs = &fs;
4017                        let query = &query;
4018                        let matching_paths_tx = &matching_paths_tx;
4019                        let paths_per_worker = (path_count + workers - 1) / workers;
4020                        let snapshots = &snapshots;
4021                        background
4022                            .scoped(|scope| {
4023                                for worker_ix in 0..workers {
4024                                    let worker_start_ix = worker_ix * paths_per_worker;
4025                                    let worker_end_ix = worker_start_ix + paths_per_worker;
4026                                    scope.spawn(async move {
4027                                        let mut snapshot_start_ix = 0;
4028                                        let mut abs_path = PathBuf::new();
4029                                        for snapshot in snapshots {
4030                                            let snapshot_end_ix =
4031                                                snapshot_start_ix + snapshot.visible_file_count();
4032                                            if worker_end_ix <= snapshot_start_ix {
4033                                                break;
4034                                            } else if worker_start_ix > snapshot_end_ix {
4035                                                snapshot_start_ix = snapshot_end_ix;
4036                                                continue;
4037                                            } else {
4038                                                let start_in_snapshot = worker_start_ix
4039                                                    .saturating_sub(snapshot_start_ix);
4040                                                let end_in_snapshot =
4041                                                    cmp::min(worker_end_ix, snapshot_end_ix)
4042                                                        - snapshot_start_ix;
4043
4044                                                for entry in snapshot
4045                                                    .files(false, start_in_snapshot)
4046                                                    .take(end_in_snapshot - start_in_snapshot)
4047                                                {
4048                                                    if matching_paths_tx.is_closed() {
4049                                                        break;
4050                                                    }
4051
4052                                                    abs_path.clear();
4053                                                    abs_path.push(&snapshot.abs_path());
4054                                                    abs_path.push(&entry.path);
4055                                                    let matches = if let Some(file) =
4056                                                        fs.open_sync(&abs_path).await.log_err()
4057                                                    {
4058                                                        query.detect(file).unwrap_or(false)
4059                                                    } else {
4060                                                        false
4061                                                    };
4062
4063                                                    if matches {
4064                                                        let project_path =
4065                                                            (snapshot.id(), entry.path.clone());
4066                                                        if matching_paths_tx
4067                                                            .send(project_path)
4068                                                            .await
4069                                                            .is_err()
4070                                                        {
4071                                                            break;
4072                                                        }
4073                                                    }
4074                                                }
4075
4076                                                snapshot_start_ix = snapshot_end_ix;
4077                                            }
4078                                        }
4079                                    });
4080                                }
4081                            })
4082                            .await;
4083                    }
4084                })
4085                .detach();
4086
4087            let (buffers_tx, buffers_rx) = smol::channel::bounded(1024);
4088            let open_buffers = self
4089                .opened_buffers
4090                .values()
4091                .filter_map(|b| b.upgrade(cx))
4092                .collect::<HashSet<_>>();
4093            cx.spawn(|this, cx| async move {
4094                for buffer in &open_buffers {
4095                    let snapshot = buffer.read_with(&cx, |buffer, _| buffer.snapshot());
4096                    buffers_tx.send((buffer.clone(), snapshot)).await?;
4097                }
4098
4099                let open_buffers = Rc::new(RefCell::new(open_buffers));
4100                while let Some(project_path) = matching_paths_rx.next().await {
4101                    if buffers_tx.is_closed() {
4102                        break;
4103                    }
4104
4105                    let this = this.clone();
4106                    let open_buffers = open_buffers.clone();
4107                    let buffers_tx = buffers_tx.clone();
4108                    cx.spawn(|mut cx| async move {
4109                        if let Some(buffer) = this
4110                            .update(&mut cx, |this, cx| this.open_buffer(project_path, cx))
4111                            .await
4112                            .log_err()
4113                        {
4114                            if open_buffers.borrow_mut().insert(buffer.clone()) {
4115                                let snapshot = buffer.read_with(&cx, |buffer, _| buffer.snapshot());
4116                                buffers_tx.send((buffer, snapshot)).await?;
4117                            }
4118                        }
4119
4120                        Ok::<_, anyhow::Error>(())
4121                    })
4122                    .detach();
4123                }
4124
4125                Ok::<_, anyhow::Error>(())
4126            })
4127            .detach_and_log_err(cx);
4128
4129            let background = cx.background().clone();
4130            cx.background().spawn(async move {
4131                let query = &query;
4132                let mut matched_buffers = Vec::new();
4133                for _ in 0..workers {
4134                    matched_buffers.push(HashMap::default());
4135                }
4136                background
4137                    .scoped(|scope| {
4138                        for worker_matched_buffers in matched_buffers.iter_mut() {
4139                            let mut buffers_rx = buffers_rx.clone();
4140                            scope.spawn(async move {
4141                                while let Some((buffer, snapshot)) = buffers_rx.next().await {
4142                                    let buffer_matches = query
4143                                        .search(snapshot.as_rope())
4144                                        .await
4145                                        .iter()
4146                                        .map(|range| {
4147                                            snapshot.anchor_before(range.start)
4148                                                ..snapshot.anchor_after(range.end)
4149                                        })
4150                                        .collect::<Vec<_>>();
4151                                    if !buffer_matches.is_empty() {
4152                                        worker_matched_buffers
4153                                            .insert(buffer.clone(), buffer_matches);
4154                                    }
4155                                }
4156                            });
4157                        }
4158                    })
4159                    .await;
4160                Ok(matched_buffers.into_iter().flatten().collect())
4161            })
4162        } else if let Some(project_id) = self.remote_id() {
4163            let request = self.client.request(query.to_proto(project_id));
4164            cx.spawn(|this, mut cx| async move {
4165                let response = request.await?;
4166                let mut result = HashMap::default();
4167                for location in response.locations {
4168                    let target_buffer = this
4169                        .update(&mut cx, |this, cx| {
4170                            this.wait_for_remote_buffer(location.buffer_id, cx)
4171                        })
4172                        .await?;
4173                    let start = location
4174                        .start
4175                        .and_then(deserialize_anchor)
4176                        .ok_or_else(|| anyhow!("missing target start"))?;
4177                    let end = location
4178                        .end
4179                        .and_then(deserialize_anchor)
4180                        .ok_or_else(|| anyhow!("missing target end"))?;
4181                    result
4182                        .entry(target_buffer)
4183                        .or_insert(Vec::new())
4184                        .push(start..end)
4185                }
4186                Ok(result)
4187            })
4188        } else {
4189            Task::ready(Ok(Default::default()))
4190        }
4191    }
4192
4193    fn request_lsp<R: LspCommand>(
4194        &self,
4195        buffer_handle: ModelHandle<Buffer>,
4196        request: R,
4197        cx: &mut ModelContext<Self>,
4198    ) -> Task<Result<R::Response>>
4199    where
4200        <R::LspRequest as lsp::request::Request>::Result: Send,
4201    {
4202        let buffer = buffer_handle.read(cx);
4203        if self.is_local() {
4204            let file = File::from_dyn(buffer.file()).and_then(File::as_local);
4205            if let Some((file, language_server)) = file.zip(
4206                self.language_server_for_buffer(buffer, cx)
4207                    .map(|(_, server)| server.clone()),
4208            ) {
4209                let lsp_params = request.to_lsp(&file.abs_path(cx), buffer, &language_server, cx);
4210                return cx.spawn(|this, cx| async move {
4211                    if !request.check_capabilities(language_server.capabilities()) {
4212                        return Ok(Default::default());
4213                    }
4214
4215                    let response = language_server
4216                        .request::<R::LspRequest>(lsp_params)
4217                        .await
4218                        .context("lsp request failed")?;
4219                    request
4220                        .response_from_lsp(response, this, buffer_handle, cx)
4221                        .await
4222                });
4223            }
4224        } else if let Some(project_id) = self.remote_id() {
4225            let rpc = self.client.clone();
4226            let message = request.to_proto(project_id, buffer);
4227            return cx.spawn_weak(|this, cx| async move {
4228                // Ensure the project is still alive by the time the task
4229                // is scheduled.
4230                this.upgrade(&cx)
4231                    .ok_or_else(|| anyhow!("project dropped"))?;
4232
4233                let response = rpc.request(message).await?;
4234
4235                let this = this
4236                    .upgrade(&cx)
4237                    .ok_or_else(|| anyhow!("project dropped"))?;
4238                if this.read_with(&cx, |this, _| this.is_read_only()) {
4239                    Err(anyhow!("disconnected before completing request"))
4240                } else {
4241                    request
4242                        .response_from_proto(response, this, buffer_handle, cx)
4243                        .await
4244                }
4245            });
4246        }
4247        Task::ready(Ok(Default::default()))
4248    }
4249
4250    pub fn find_or_create_local_worktree(
4251        &mut self,
4252        abs_path: impl AsRef<Path>,
4253        visible: bool,
4254        cx: &mut ModelContext<Self>,
4255    ) -> Task<Result<(ModelHandle<Worktree>, PathBuf)>> {
4256        let abs_path = abs_path.as_ref();
4257        if let Some((tree, relative_path)) = self.find_local_worktree(abs_path, cx) {
4258            Task::ready(Ok((tree, relative_path)))
4259        } else {
4260            let worktree = self.create_local_worktree(abs_path, visible, cx);
4261            cx.foreground()
4262                .spawn(async move { Ok((worktree.await?, PathBuf::new())) })
4263        }
4264    }
4265
4266    pub fn find_local_worktree(
4267        &self,
4268        abs_path: &Path,
4269        cx: &AppContext,
4270    ) -> Option<(ModelHandle<Worktree>, PathBuf)> {
4271        for tree in &self.worktrees {
4272            if let Some(tree) = tree.upgrade(cx) {
4273                if let Some(relative_path) = tree
4274                    .read(cx)
4275                    .as_local()
4276                    .and_then(|t| abs_path.strip_prefix(t.abs_path()).ok())
4277                {
4278                    return Some((tree.clone(), relative_path.into()));
4279                }
4280            }
4281        }
4282        None
4283    }
4284
4285    pub fn is_shared(&self) -> bool {
4286        match &self.client_state {
4287            Some(ProjectClientState::Local { .. }) => true,
4288            _ => false,
4289        }
4290    }
4291
4292    fn create_local_worktree(
4293        &mut self,
4294        abs_path: impl AsRef<Path>,
4295        visible: bool,
4296        cx: &mut ModelContext<Self>,
4297    ) -> Task<Result<ModelHandle<Worktree>>> {
4298        let fs = self.fs.clone();
4299        let client = self.client.clone();
4300        let next_entry_id = self.next_entry_id.clone();
4301        let path: Arc<Path> = abs_path.as_ref().into();
4302        let task = self
4303            .loading_local_worktrees
4304            .entry(path.clone())
4305            .or_insert_with(|| {
4306                cx.spawn(|project, mut cx| {
4307                    async move {
4308                        let worktree = Worktree::local(
4309                            client.clone(),
4310                            path.clone(),
4311                            visible,
4312                            fs,
4313                            next_entry_id,
4314                            &mut cx,
4315                        )
4316                        .await;
4317
4318                        project.update(&mut cx, |project, _| {
4319                            project.loading_local_worktrees.remove(&path);
4320                        });
4321
4322                        let worktree = worktree?;
4323                        project.update(&mut cx, |project, cx| project.add_worktree(&worktree, cx));
4324                        Ok(worktree)
4325                    }
4326                    .map_err(Arc::new)
4327                })
4328                .shared()
4329            })
4330            .clone();
4331        cx.foreground().spawn(async move {
4332            match task.await {
4333                Ok(worktree) => Ok(worktree),
4334                Err(err) => Err(anyhow!("{}", err)),
4335            }
4336        })
4337    }
4338
4339    pub fn remove_worktree(&mut self, id_to_remove: WorktreeId, cx: &mut ModelContext<Self>) {
4340        self.worktrees.retain(|worktree| {
4341            if let Some(worktree) = worktree.upgrade(cx) {
4342                let id = worktree.read(cx).id();
4343                if id == id_to_remove {
4344                    cx.emit(Event::WorktreeRemoved(id));
4345                    false
4346                } else {
4347                    true
4348                }
4349            } else {
4350                false
4351            }
4352        });
4353        self.metadata_changed(cx);
4354    }
4355
4356    fn add_worktree(&mut self, worktree: &ModelHandle<Worktree>, cx: &mut ModelContext<Self>) {
4357        cx.observe(worktree, |_, _, cx| cx.notify()).detach();
4358        if worktree.read(cx).is_local() {
4359            cx.subscribe(worktree, |this, worktree, event, cx| match event {
4360                worktree::Event::UpdatedEntries(changes) => {
4361                    this.update_local_worktree_buffers(&worktree, cx);
4362                    this.update_local_worktree_language_servers(&worktree, changes, cx);
4363                }
4364                worktree::Event::UpdatedGitRepositories(updated_repos) => {
4365                    this.update_local_worktree_buffers_git_repos(worktree, updated_repos, cx)
4366                }
4367            })
4368            .detach();
4369        }
4370
4371        let push_strong_handle = {
4372            let worktree = worktree.read(cx);
4373            self.is_shared() || worktree.is_visible() || worktree.is_remote()
4374        };
4375        if push_strong_handle {
4376            self.worktrees
4377                .push(WorktreeHandle::Strong(worktree.clone()));
4378        } else {
4379            self.worktrees
4380                .push(WorktreeHandle::Weak(worktree.downgrade()));
4381        }
4382
4383        cx.observe_release(worktree, |this, worktree, cx| {
4384            let _ = this.remove_worktree(worktree.id(), cx);
4385        })
4386        .detach();
4387
4388        cx.emit(Event::WorktreeAdded);
4389        self.metadata_changed(cx);
4390    }
4391
4392    fn update_local_worktree_buffers(
4393        &mut self,
4394        worktree_handle: &ModelHandle<Worktree>,
4395        cx: &mut ModelContext<Self>,
4396    ) {
4397        let snapshot = worktree_handle.read(cx).snapshot();
4398        let mut buffers_to_delete = Vec::new();
4399        let mut renamed_buffers = Vec::new();
4400        for (buffer_id, buffer) in &self.opened_buffers {
4401            if let Some(buffer) = buffer.upgrade(cx) {
4402                buffer.update(cx, |buffer, cx| {
4403                    if let Some(old_file) = File::from_dyn(buffer.file()) {
4404                        if old_file.worktree != *worktree_handle {
4405                            return;
4406                        }
4407
4408                        let new_file = if let Some(entry) = snapshot.entry_for_id(old_file.entry_id)
4409                        {
4410                            File {
4411                                is_local: true,
4412                                entry_id: entry.id,
4413                                mtime: entry.mtime,
4414                                path: entry.path.clone(),
4415                                worktree: worktree_handle.clone(),
4416                                is_deleted: false,
4417                            }
4418                        } else if let Some(entry) =
4419                            snapshot.entry_for_path(old_file.path().as_ref())
4420                        {
4421                            File {
4422                                is_local: true,
4423                                entry_id: entry.id,
4424                                mtime: entry.mtime,
4425                                path: entry.path.clone(),
4426                                worktree: worktree_handle.clone(),
4427                                is_deleted: false,
4428                            }
4429                        } else {
4430                            File {
4431                                is_local: true,
4432                                entry_id: old_file.entry_id,
4433                                path: old_file.path().clone(),
4434                                mtime: old_file.mtime(),
4435                                worktree: worktree_handle.clone(),
4436                                is_deleted: true,
4437                            }
4438                        };
4439
4440                        let old_path = old_file.abs_path(cx);
4441                        if new_file.abs_path(cx) != old_path {
4442                            renamed_buffers.push((cx.handle(), old_path));
4443                        }
4444
4445                        if new_file != *old_file {
4446                            if let Some(project_id) = self.remote_id() {
4447                                self.client
4448                                    .send(proto::UpdateBufferFile {
4449                                        project_id,
4450                                        buffer_id: *buffer_id as u64,
4451                                        file: Some(new_file.to_proto()),
4452                                    })
4453                                    .log_err();
4454                            }
4455
4456                            buffer.file_updated(Arc::new(new_file), cx).detach();
4457                        }
4458                    }
4459                });
4460            } else {
4461                buffers_to_delete.push(*buffer_id);
4462            }
4463        }
4464
4465        for buffer_id in buffers_to_delete {
4466            self.opened_buffers.remove(&buffer_id);
4467        }
4468
4469        for (buffer, old_path) in renamed_buffers {
4470            self.unregister_buffer_from_language_server(&buffer, old_path, cx);
4471            self.detect_language_for_buffer(&buffer, cx);
4472            self.register_buffer_with_language_server(&buffer, cx);
4473        }
4474    }
4475
4476    fn update_local_worktree_language_servers(
4477        &mut self,
4478        worktree_handle: &ModelHandle<Worktree>,
4479        changes: &HashMap<Arc<Path>, PathChange>,
4480        cx: &mut ModelContext<Self>,
4481    ) {
4482        let worktree_id = worktree_handle.read(cx).id();
4483        let abs_path = worktree_handle.read(cx).abs_path();
4484        for ((server_worktree_id, _), server_id) in &self.language_server_ids {
4485            if *server_worktree_id == worktree_id {
4486                if let Some(server) = self.language_servers.get(server_id) {
4487                    if let LanguageServerState::Running {
4488                        server,
4489                        watched_paths,
4490                        ..
4491                    } = server
4492                    {
4493                        let params = lsp::DidChangeWatchedFilesParams {
4494                            changes: changes
4495                                .iter()
4496                                .filter_map(|(path, change)| {
4497                                    let path = abs_path.join(path);
4498                                    if watched_paths.matches(&path) {
4499                                        Some(lsp::FileEvent {
4500                                            uri: lsp::Url::from_file_path(path).unwrap(),
4501                                            typ: match change {
4502                                                PathChange::Added => lsp::FileChangeType::CREATED,
4503                                                PathChange::Removed => lsp::FileChangeType::DELETED,
4504                                                PathChange::Updated
4505                                                | PathChange::AddedOrUpdated => {
4506                                                    lsp::FileChangeType::CHANGED
4507                                                }
4508                                            },
4509                                        })
4510                                    } else {
4511                                        None
4512                                    }
4513                                })
4514                                .collect(),
4515                        };
4516
4517                        if !params.changes.is_empty() {
4518                            server
4519                                .notify::<lsp::notification::DidChangeWatchedFiles>(params)
4520                                .log_err();
4521                        }
4522                    }
4523                }
4524            }
4525        }
4526    }
4527
4528    fn update_local_worktree_buffers_git_repos(
4529        &mut self,
4530        worktree: ModelHandle<Worktree>,
4531        repos: &[GitRepositoryEntry],
4532        cx: &mut ModelContext<Self>,
4533    ) {
4534        for (_, buffer) in &self.opened_buffers {
4535            if let Some(buffer) = buffer.upgrade(cx) {
4536                let file = match File::from_dyn(buffer.read(cx).file()) {
4537                    Some(file) => file,
4538                    None => continue,
4539                };
4540                if file.worktree != worktree {
4541                    continue;
4542                }
4543
4544                let path = file.path().clone();
4545
4546                let repo = match repos.iter().find(|repo| repo.manages(&path)) {
4547                    Some(repo) => repo.clone(),
4548                    None => return,
4549                };
4550
4551                let relative_repo = match path.strip_prefix(repo.content_path) {
4552                    Ok(relative_repo) => relative_repo.to_owned(),
4553                    Err(_) => return,
4554                };
4555
4556                let remote_id = self.remote_id();
4557                let client = self.client.clone();
4558
4559                cx.spawn(|_, mut cx| async move {
4560                    let diff_base = cx
4561                        .background()
4562                        .spawn(async move { repo.repo.lock().load_index_text(&relative_repo) })
4563                        .await;
4564
4565                    let buffer_id = buffer.update(&mut cx, |buffer, cx| {
4566                        buffer.set_diff_base(diff_base.clone(), cx);
4567                        buffer.remote_id()
4568                    });
4569
4570                    if let Some(project_id) = remote_id {
4571                        client
4572                            .send(proto::UpdateDiffBase {
4573                                project_id,
4574                                buffer_id: buffer_id as u64,
4575                                diff_base,
4576                            })
4577                            .log_err();
4578                    }
4579                })
4580                .detach();
4581            }
4582        }
4583    }
4584
4585    pub fn set_active_path(&mut self, entry: Option<ProjectPath>, cx: &mut ModelContext<Self>) {
4586        let new_active_entry = entry.and_then(|project_path| {
4587            let worktree = self.worktree_for_id(project_path.worktree_id, cx)?;
4588            let entry = worktree.read(cx).entry_for_path(project_path.path)?;
4589            Some(entry.id)
4590        });
4591        if new_active_entry != self.active_entry {
4592            self.active_entry = new_active_entry;
4593            cx.emit(Event::ActiveEntryChanged(new_active_entry));
4594        }
4595    }
4596
4597    pub fn language_servers_running_disk_based_diagnostics(
4598        &self,
4599    ) -> impl Iterator<Item = usize> + '_ {
4600        self.language_server_statuses
4601            .iter()
4602            .filter_map(|(id, status)| {
4603                if status.has_pending_diagnostic_updates {
4604                    Some(*id)
4605                } else {
4606                    None
4607                }
4608            })
4609    }
4610
4611    pub fn diagnostic_summary(&self, cx: &AppContext) -> DiagnosticSummary {
4612        let mut summary = DiagnosticSummary::default();
4613        for (_, path_summary) in self.diagnostic_summaries(cx) {
4614            summary.error_count += path_summary.error_count;
4615            summary.warning_count += path_summary.warning_count;
4616        }
4617        summary
4618    }
4619
4620    pub fn diagnostic_summaries<'a>(
4621        &'a self,
4622        cx: &'a AppContext,
4623    ) -> impl Iterator<Item = (ProjectPath, DiagnosticSummary)> + 'a {
4624        self.visible_worktrees(cx).flat_map(move |worktree| {
4625            let worktree = worktree.read(cx);
4626            let worktree_id = worktree.id();
4627            worktree
4628                .diagnostic_summaries()
4629                .map(move |(path, summary)| (ProjectPath { worktree_id, path }, summary))
4630        })
4631    }
4632
4633    pub fn disk_based_diagnostics_started(
4634        &mut self,
4635        language_server_id: usize,
4636        cx: &mut ModelContext<Self>,
4637    ) {
4638        cx.emit(Event::DiskBasedDiagnosticsStarted { language_server_id });
4639    }
4640
4641    pub fn disk_based_diagnostics_finished(
4642        &mut self,
4643        language_server_id: usize,
4644        cx: &mut ModelContext<Self>,
4645    ) {
4646        cx.emit(Event::DiskBasedDiagnosticsFinished { language_server_id });
4647    }
4648
4649    pub fn active_entry(&self) -> Option<ProjectEntryId> {
4650        self.active_entry
4651    }
4652
4653    pub fn entry_for_path(&self, path: &ProjectPath, cx: &AppContext) -> Option<Entry> {
4654        self.worktree_for_id(path.worktree_id, cx)?
4655            .read(cx)
4656            .entry_for_path(&path.path)
4657            .cloned()
4658    }
4659
4660    pub fn path_for_entry(&self, entry_id: ProjectEntryId, cx: &AppContext) -> Option<ProjectPath> {
4661        let worktree = self.worktree_for_entry(entry_id, cx)?;
4662        let worktree = worktree.read(cx);
4663        let worktree_id = worktree.id();
4664        let path = worktree.entry_for_id(entry_id)?.path.clone();
4665        Some(ProjectPath { worktree_id, path })
4666    }
4667
4668    // RPC message handlers
4669
4670    async fn handle_unshare_project(
4671        this: ModelHandle<Self>,
4672        _: TypedEnvelope<proto::UnshareProject>,
4673        _: Arc<Client>,
4674        mut cx: AsyncAppContext,
4675    ) -> Result<()> {
4676        this.update(&mut cx, |this, cx| {
4677            if this.is_local() {
4678                this.unshare(cx)?;
4679            } else {
4680                this.disconnected_from_host(cx);
4681            }
4682            Ok(())
4683        })
4684    }
4685
4686    async fn handle_add_collaborator(
4687        this: ModelHandle<Self>,
4688        mut envelope: TypedEnvelope<proto::AddProjectCollaborator>,
4689        _: Arc<Client>,
4690        mut cx: AsyncAppContext,
4691    ) -> Result<()> {
4692        let collaborator = envelope
4693            .payload
4694            .collaborator
4695            .take()
4696            .ok_or_else(|| anyhow!("empty collaborator"))?;
4697
4698        let collaborator = Collaborator::from_proto(collaborator)?;
4699        this.update(&mut cx, |this, cx| {
4700            this.shared_buffers.remove(&collaborator.peer_id);
4701            this.collaborators
4702                .insert(collaborator.peer_id, collaborator);
4703            cx.notify();
4704        });
4705
4706        Ok(())
4707    }
4708
4709    async fn handle_update_project_collaborator(
4710        this: ModelHandle<Self>,
4711        envelope: TypedEnvelope<proto::UpdateProjectCollaborator>,
4712        _: Arc<Client>,
4713        mut cx: AsyncAppContext,
4714    ) -> Result<()> {
4715        let old_peer_id = envelope
4716            .payload
4717            .old_peer_id
4718            .ok_or_else(|| anyhow!("missing old peer id"))?;
4719        let new_peer_id = envelope
4720            .payload
4721            .new_peer_id
4722            .ok_or_else(|| anyhow!("missing new peer id"))?;
4723        this.update(&mut cx, |this, cx| {
4724            let collaborator = this
4725                .collaborators
4726                .remove(&old_peer_id)
4727                .ok_or_else(|| anyhow!("received UpdateProjectCollaborator for unknown peer"))?;
4728            let is_host = collaborator.replica_id == 0;
4729            this.collaborators.insert(new_peer_id, collaborator);
4730
4731            let buffers = this.shared_buffers.remove(&old_peer_id);
4732            log::info!(
4733                "peer {} became {}. moving buffers {:?}",
4734                old_peer_id,
4735                new_peer_id,
4736                &buffers
4737            );
4738            if let Some(buffers) = buffers {
4739                this.shared_buffers.insert(new_peer_id, buffers);
4740            }
4741
4742            if is_host {
4743                this.opened_buffers
4744                    .retain(|_, buffer| !matches!(buffer, OpenBuffer::Operations(_)));
4745                this.buffer_changes_tx
4746                    .unbounded_send(BufferMessage::Resync)
4747                    .unwrap();
4748            }
4749
4750            cx.emit(Event::CollaboratorUpdated {
4751                old_peer_id,
4752                new_peer_id,
4753            });
4754            cx.notify();
4755            Ok(())
4756        })
4757    }
4758
4759    async fn handle_remove_collaborator(
4760        this: ModelHandle<Self>,
4761        envelope: TypedEnvelope<proto::RemoveProjectCollaborator>,
4762        _: Arc<Client>,
4763        mut cx: AsyncAppContext,
4764    ) -> Result<()> {
4765        this.update(&mut cx, |this, cx| {
4766            let peer_id = envelope
4767                .payload
4768                .peer_id
4769                .ok_or_else(|| anyhow!("invalid peer id"))?;
4770            let replica_id = this
4771                .collaborators
4772                .remove(&peer_id)
4773                .ok_or_else(|| anyhow!("unknown peer {:?}", peer_id))?
4774                .replica_id;
4775            for buffer in this.opened_buffers.values() {
4776                if let Some(buffer) = buffer.upgrade(cx) {
4777                    buffer.update(cx, |buffer, cx| buffer.remove_peer(replica_id, cx));
4778                }
4779            }
4780            this.shared_buffers.remove(&peer_id);
4781
4782            cx.emit(Event::CollaboratorLeft(peer_id));
4783            cx.notify();
4784            Ok(())
4785        })
4786    }
4787
4788    async fn handle_update_project(
4789        this: ModelHandle<Self>,
4790        envelope: TypedEnvelope<proto::UpdateProject>,
4791        _: Arc<Client>,
4792        mut cx: AsyncAppContext,
4793    ) -> Result<()> {
4794        this.update(&mut cx, |this, cx| {
4795            // Don't handle messages that were sent before the response to us joining the project
4796            if envelope.message_id > this.join_project_response_message_id {
4797                this.set_worktrees_from_proto(envelope.payload.worktrees, cx)?;
4798            }
4799            Ok(())
4800        })
4801    }
4802
4803    async fn handle_update_worktree(
4804        this: ModelHandle<Self>,
4805        envelope: TypedEnvelope<proto::UpdateWorktree>,
4806        _: Arc<Client>,
4807        mut cx: AsyncAppContext,
4808    ) -> Result<()> {
4809        this.update(&mut cx, |this, cx| {
4810            let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
4811            if let Some(worktree) = this.worktree_for_id(worktree_id, cx) {
4812                worktree.update(cx, |worktree, _| {
4813                    let worktree = worktree.as_remote_mut().unwrap();
4814                    worktree.update_from_remote(envelope.payload);
4815                });
4816            }
4817            Ok(())
4818        })
4819    }
4820
4821    async fn handle_create_project_entry(
4822        this: ModelHandle<Self>,
4823        envelope: TypedEnvelope<proto::CreateProjectEntry>,
4824        _: Arc<Client>,
4825        mut cx: AsyncAppContext,
4826    ) -> Result<proto::ProjectEntryResponse> {
4827        let worktree = this.update(&mut cx, |this, cx| {
4828            let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
4829            this.worktree_for_id(worktree_id, cx)
4830                .ok_or_else(|| anyhow!("worktree not found"))
4831        })?;
4832        let worktree_scan_id = worktree.read_with(&cx, |worktree, _| worktree.scan_id());
4833        let entry = worktree
4834            .update(&mut cx, |worktree, cx| {
4835                let worktree = worktree.as_local_mut().unwrap();
4836                let path = PathBuf::from(envelope.payload.path);
4837                worktree.create_entry(path, envelope.payload.is_directory, cx)
4838            })
4839            .await?;
4840        Ok(proto::ProjectEntryResponse {
4841            entry: Some((&entry).into()),
4842            worktree_scan_id: worktree_scan_id as u64,
4843        })
4844    }
4845
4846    async fn handle_rename_project_entry(
4847        this: ModelHandle<Self>,
4848        envelope: TypedEnvelope<proto::RenameProjectEntry>,
4849        _: Arc<Client>,
4850        mut cx: AsyncAppContext,
4851    ) -> Result<proto::ProjectEntryResponse> {
4852        let entry_id = ProjectEntryId::from_proto(envelope.payload.entry_id);
4853        let worktree = this.read_with(&cx, |this, cx| {
4854            this.worktree_for_entry(entry_id, cx)
4855                .ok_or_else(|| anyhow!("worktree not found"))
4856        })?;
4857        let worktree_scan_id = worktree.read_with(&cx, |worktree, _| worktree.scan_id());
4858        let entry = worktree
4859            .update(&mut cx, |worktree, cx| {
4860                let new_path = PathBuf::from(envelope.payload.new_path);
4861                worktree
4862                    .as_local_mut()
4863                    .unwrap()
4864                    .rename_entry(entry_id, new_path, cx)
4865                    .ok_or_else(|| anyhow!("invalid entry"))
4866            })?
4867            .await?;
4868        Ok(proto::ProjectEntryResponse {
4869            entry: Some((&entry).into()),
4870            worktree_scan_id: worktree_scan_id as u64,
4871        })
4872    }
4873
4874    async fn handle_copy_project_entry(
4875        this: ModelHandle<Self>,
4876        envelope: TypedEnvelope<proto::CopyProjectEntry>,
4877        _: Arc<Client>,
4878        mut cx: AsyncAppContext,
4879    ) -> Result<proto::ProjectEntryResponse> {
4880        let entry_id = ProjectEntryId::from_proto(envelope.payload.entry_id);
4881        let worktree = this.read_with(&cx, |this, cx| {
4882            this.worktree_for_entry(entry_id, cx)
4883                .ok_or_else(|| anyhow!("worktree not found"))
4884        })?;
4885        let worktree_scan_id = worktree.read_with(&cx, |worktree, _| worktree.scan_id());
4886        let entry = worktree
4887            .update(&mut cx, |worktree, cx| {
4888                let new_path = PathBuf::from(envelope.payload.new_path);
4889                worktree
4890                    .as_local_mut()
4891                    .unwrap()
4892                    .copy_entry(entry_id, new_path, cx)
4893                    .ok_or_else(|| anyhow!("invalid entry"))
4894            })?
4895            .await?;
4896        Ok(proto::ProjectEntryResponse {
4897            entry: Some((&entry).into()),
4898            worktree_scan_id: worktree_scan_id as u64,
4899        })
4900    }
4901
4902    async fn handle_delete_project_entry(
4903        this: ModelHandle<Self>,
4904        envelope: TypedEnvelope<proto::DeleteProjectEntry>,
4905        _: Arc<Client>,
4906        mut cx: AsyncAppContext,
4907    ) -> Result<proto::ProjectEntryResponse> {
4908        let entry_id = ProjectEntryId::from_proto(envelope.payload.entry_id);
4909        let worktree = this.read_with(&cx, |this, cx| {
4910            this.worktree_for_entry(entry_id, cx)
4911                .ok_or_else(|| anyhow!("worktree not found"))
4912        })?;
4913        let worktree_scan_id = worktree.read_with(&cx, |worktree, _| worktree.scan_id());
4914        worktree
4915            .update(&mut cx, |worktree, cx| {
4916                worktree
4917                    .as_local_mut()
4918                    .unwrap()
4919                    .delete_entry(entry_id, cx)
4920                    .ok_or_else(|| anyhow!("invalid entry"))
4921            })?
4922            .await?;
4923        Ok(proto::ProjectEntryResponse {
4924            entry: None,
4925            worktree_scan_id: worktree_scan_id as u64,
4926        })
4927    }
4928
4929    async fn handle_update_diagnostic_summary(
4930        this: ModelHandle<Self>,
4931        envelope: TypedEnvelope<proto::UpdateDiagnosticSummary>,
4932        _: Arc<Client>,
4933        mut cx: AsyncAppContext,
4934    ) -> Result<()> {
4935        this.update(&mut cx, |this, cx| {
4936            let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
4937            if let Some(worktree) = this.worktree_for_id(worktree_id, cx) {
4938                if let Some(summary) = envelope.payload.summary {
4939                    let project_path = ProjectPath {
4940                        worktree_id,
4941                        path: Path::new(&summary.path).into(),
4942                    };
4943                    worktree.update(cx, |worktree, _| {
4944                        worktree
4945                            .as_remote_mut()
4946                            .unwrap()
4947                            .update_diagnostic_summary(project_path.path.clone(), &summary);
4948                    });
4949                    cx.emit(Event::DiagnosticsUpdated {
4950                        language_server_id: summary.language_server_id as usize,
4951                        path: project_path,
4952                    });
4953                }
4954            }
4955            Ok(())
4956        })
4957    }
4958
4959    async fn handle_start_language_server(
4960        this: ModelHandle<Self>,
4961        envelope: TypedEnvelope<proto::StartLanguageServer>,
4962        _: Arc<Client>,
4963        mut cx: AsyncAppContext,
4964    ) -> Result<()> {
4965        let server = envelope
4966            .payload
4967            .server
4968            .ok_or_else(|| anyhow!("invalid server"))?;
4969        this.update(&mut cx, |this, cx| {
4970            this.language_server_statuses.insert(
4971                server.id as usize,
4972                LanguageServerStatus {
4973                    name: server.name,
4974                    pending_work: Default::default(),
4975                    has_pending_diagnostic_updates: false,
4976                    progress_tokens: Default::default(),
4977                },
4978            );
4979            cx.notify();
4980        });
4981        Ok(())
4982    }
4983
4984    async fn handle_update_language_server(
4985        this: ModelHandle<Self>,
4986        envelope: TypedEnvelope<proto::UpdateLanguageServer>,
4987        _: Arc<Client>,
4988        mut cx: AsyncAppContext,
4989    ) -> Result<()> {
4990        this.update(&mut cx, |this, cx| {
4991            let language_server_id = envelope.payload.language_server_id as usize;
4992
4993            match envelope
4994                .payload
4995                .variant
4996                .ok_or_else(|| anyhow!("invalid variant"))?
4997            {
4998                proto::update_language_server::Variant::WorkStart(payload) => {
4999                    this.on_lsp_work_start(
5000                        language_server_id,
5001                        payload.token,
5002                        LanguageServerProgress {
5003                            message: payload.message,
5004                            percentage: payload.percentage.map(|p| p as usize),
5005                            last_update_at: Instant::now(),
5006                        },
5007                        cx,
5008                    );
5009                }
5010
5011                proto::update_language_server::Variant::WorkProgress(payload) => {
5012                    this.on_lsp_work_progress(
5013                        language_server_id,
5014                        payload.token,
5015                        LanguageServerProgress {
5016                            message: payload.message,
5017                            percentage: payload.percentage.map(|p| p as usize),
5018                            last_update_at: Instant::now(),
5019                        },
5020                        cx,
5021                    );
5022                }
5023
5024                proto::update_language_server::Variant::WorkEnd(payload) => {
5025                    this.on_lsp_work_end(language_server_id, payload.token, cx);
5026                }
5027
5028                proto::update_language_server::Variant::DiskBasedDiagnosticsUpdating(_) => {
5029                    this.disk_based_diagnostics_started(language_server_id, cx);
5030                }
5031
5032                proto::update_language_server::Variant::DiskBasedDiagnosticsUpdated(_) => {
5033                    this.disk_based_diagnostics_finished(language_server_id, cx)
5034                }
5035            }
5036
5037            Ok(())
5038        })
5039    }
5040
5041    async fn handle_update_buffer(
5042        this: ModelHandle<Self>,
5043        envelope: TypedEnvelope<proto::UpdateBuffer>,
5044        _: Arc<Client>,
5045        mut cx: AsyncAppContext,
5046    ) -> Result<proto::Ack> {
5047        this.update(&mut cx, |this, cx| {
5048            let payload = envelope.payload.clone();
5049            let buffer_id = payload.buffer_id;
5050            let ops = payload
5051                .operations
5052                .into_iter()
5053                .map(language::proto::deserialize_operation)
5054                .collect::<Result<Vec<_>, _>>()?;
5055            let is_remote = this.is_remote();
5056            match this.opened_buffers.entry(buffer_id) {
5057                hash_map::Entry::Occupied(mut e) => match e.get_mut() {
5058                    OpenBuffer::Strong(buffer) => {
5059                        buffer.update(cx, |buffer, cx| buffer.apply_ops(ops, cx))?;
5060                    }
5061                    OpenBuffer::Operations(operations) => operations.extend_from_slice(&ops),
5062                    OpenBuffer::Weak(_) => {}
5063                },
5064                hash_map::Entry::Vacant(e) => {
5065                    assert!(
5066                        is_remote,
5067                        "received buffer update from {:?}",
5068                        envelope.original_sender_id
5069                    );
5070                    e.insert(OpenBuffer::Operations(ops));
5071                }
5072            }
5073            Ok(proto::Ack {})
5074        })
5075    }
5076
5077    async fn handle_create_buffer_for_peer(
5078        this: ModelHandle<Self>,
5079        envelope: TypedEnvelope<proto::CreateBufferForPeer>,
5080        _: Arc<Client>,
5081        mut cx: AsyncAppContext,
5082    ) -> Result<()> {
5083        this.update(&mut cx, |this, cx| {
5084            match envelope
5085                .payload
5086                .variant
5087                .ok_or_else(|| anyhow!("missing variant"))?
5088            {
5089                proto::create_buffer_for_peer::Variant::State(mut state) => {
5090                    let mut buffer_file = None;
5091                    if let Some(file) = state.file.take() {
5092                        let worktree_id = WorktreeId::from_proto(file.worktree_id);
5093                        let worktree = this.worktree_for_id(worktree_id, cx).ok_or_else(|| {
5094                            anyhow!("no worktree found for id {}", file.worktree_id)
5095                        })?;
5096                        buffer_file = Some(Arc::new(File::from_proto(file, worktree.clone(), cx)?)
5097                            as Arc<dyn language::File>);
5098                    }
5099
5100                    let buffer_id = state.id;
5101                    let buffer = cx.add_model(|_| {
5102                        Buffer::from_proto(this.replica_id(), state, buffer_file).unwrap()
5103                    });
5104                    this.incomplete_remote_buffers
5105                        .insert(buffer_id, Some(buffer));
5106                }
5107                proto::create_buffer_for_peer::Variant::Chunk(chunk) => {
5108                    let buffer = this
5109                        .incomplete_remote_buffers
5110                        .get(&chunk.buffer_id)
5111                        .cloned()
5112                        .flatten()
5113                        .ok_or_else(|| {
5114                            anyhow!(
5115                                "received chunk for buffer {} without initial state",
5116                                chunk.buffer_id
5117                            )
5118                        })?;
5119                    let operations = chunk
5120                        .operations
5121                        .into_iter()
5122                        .map(language::proto::deserialize_operation)
5123                        .collect::<Result<Vec<_>>>()?;
5124                    buffer.update(cx, |buffer, cx| buffer.apply_ops(operations, cx))?;
5125
5126                    if chunk.is_last {
5127                        this.incomplete_remote_buffers.remove(&chunk.buffer_id);
5128                        this.register_buffer(&buffer, cx)?;
5129                    }
5130                }
5131            }
5132
5133            Ok(())
5134        })
5135    }
5136
5137    async fn handle_update_diff_base(
5138        this: ModelHandle<Self>,
5139        envelope: TypedEnvelope<proto::UpdateDiffBase>,
5140        _: Arc<Client>,
5141        mut cx: AsyncAppContext,
5142    ) -> Result<()> {
5143        this.update(&mut cx, |this, cx| {
5144            let buffer_id = envelope.payload.buffer_id;
5145            let diff_base = envelope.payload.diff_base;
5146            if let Some(buffer) = this
5147                .opened_buffers
5148                .get_mut(&buffer_id)
5149                .and_then(|b| b.upgrade(cx))
5150                .or_else(|| {
5151                    this.incomplete_remote_buffers
5152                        .get(&buffer_id)
5153                        .cloned()
5154                        .flatten()
5155                })
5156            {
5157                buffer.update(cx, |buffer, cx| buffer.set_diff_base(diff_base, cx));
5158            }
5159            Ok(())
5160        })
5161    }
5162
5163    async fn handle_update_buffer_file(
5164        this: ModelHandle<Self>,
5165        envelope: TypedEnvelope<proto::UpdateBufferFile>,
5166        _: Arc<Client>,
5167        mut cx: AsyncAppContext,
5168    ) -> Result<()> {
5169        let buffer_id = envelope.payload.buffer_id;
5170
5171        this.update(&mut cx, |this, cx| {
5172            let payload = envelope.payload.clone();
5173            if let Some(buffer) = this
5174                .opened_buffers
5175                .get(&buffer_id)
5176                .and_then(|b| b.upgrade(cx))
5177                .or_else(|| {
5178                    this.incomplete_remote_buffers
5179                        .get(&buffer_id)
5180                        .cloned()
5181                        .flatten()
5182                })
5183            {
5184                let file = payload.file.ok_or_else(|| anyhow!("invalid file"))?;
5185                let worktree = this
5186                    .worktree_for_id(WorktreeId::from_proto(file.worktree_id), cx)
5187                    .ok_or_else(|| anyhow!("no such worktree"))?;
5188                let file = File::from_proto(file, worktree, cx)?;
5189                buffer.update(cx, |buffer, cx| {
5190                    buffer.file_updated(Arc::new(file), cx).detach();
5191                });
5192                this.detect_language_for_buffer(&buffer, cx);
5193            }
5194            Ok(())
5195        })
5196    }
5197
5198    async fn handle_save_buffer(
5199        this: ModelHandle<Self>,
5200        envelope: TypedEnvelope<proto::SaveBuffer>,
5201        _: Arc<Client>,
5202        mut cx: AsyncAppContext,
5203    ) -> Result<proto::BufferSaved> {
5204        let buffer_id = envelope.payload.buffer_id;
5205        let (project_id, buffer) = this.update(&mut cx, |this, cx| {
5206            let project_id = this.remote_id().ok_or_else(|| anyhow!("not connected"))?;
5207            let buffer = this
5208                .opened_buffers
5209                .get(&buffer_id)
5210                .and_then(|buffer| buffer.upgrade(cx))
5211                .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))?;
5212            anyhow::Ok((project_id, buffer))
5213        })?;
5214        buffer
5215            .update(&mut cx, |buffer, _| {
5216                buffer.wait_for_version(deserialize_version(&envelope.payload.version))
5217            })
5218            .await?;
5219        let buffer_id = buffer.read_with(&cx, |buffer, _| buffer.remote_id());
5220
5221        let (saved_version, fingerprint, mtime) = this
5222            .update(&mut cx, |this, cx| this.save_buffer(buffer, cx))
5223            .await?;
5224        Ok(proto::BufferSaved {
5225            project_id,
5226            buffer_id,
5227            version: serialize_version(&saved_version),
5228            mtime: Some(mtime.into()),
5229            fingerprint: language::proto::serialize_fingerprint(fingerprint),
5230        })
5231    }
5232
5233    async fn handle_reload_buffers(
5234        this: ModelHandle<Self>,
5235        envelope: TypedEnvelope<proto::ReloadBuffers>,
5236        _: Arc<Client>,
5237        mut cx: AsyncAppContext,
5238    ) -> Result<proto::ReloadBuffersResponse> {
5239        let sender_id = envelope.original_sender_id()?;
5240        let reload = this.update(&mut cx, |this, cx| {
5241            let mut buffers = HashSet::default();
5242            for buffer_id in &envelope.payload.buffer_ids {
5243                buffers.insert(
5244                    this.opened_buffers
5245                        .get(buffer_id)
5246                        .and_then(|buffer| buffer.upgrade(cx))
5247                        .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))?,
5248                );
5249            }
5250            Ok::<_, anyhow::Error>(this.reload_buffers(buffers, false, cx))
5251        })?;
5252
5253        let project_transaction = reload.await?;
5254        let project_transaction = this.update(&mut cx, |this, cx| {
5255            this.serialize_project_transaction_for_peer(project_transaction, sender_id, cx)
5256        });
5257        Ok(proto::ReloadBuffersResponse {
5258            transaction: Some(project_transaction),
5259        })
5260    }
5261
5262    async fn handle_synchronize_buffers(
5263        this: ModelHandle<Self>,
5264        envelope: TypedEnvelope<proto::SynchronizeBuffers>,
5265        _: Arc<Client>,
5266        mut cx: AsyncAppContext,
5267    ) -> Result<proto::SynchronizeBuffersResponse> {
5268        let project_id = envelope.payload.project_id;
5269        let mut response = proto::SynchronizeBuffersResponse {
5270            buffers: Default::default(),
5271        };
5272
5273        this.update(&mut cx, |this, cx| {
5274            let Some(guest_id) = envelope.original_sender_id else {
5275                log::error!("missing original_sender_id on SynchronizeBuffers request");
5276                return;
5277            };
5278
5279            this.shared_buffers.entry(guest_id).or_default().clear();
5280            for buffer in envelope.payload.buffers {
5281                let buffer_id = buffer.id;
5282                let remote_version = language::proto::deserialize_version(&buffer.version);
5283                if let Some(buffer) = this.buffer_for_id(buffer_id, cx) {
5284                    this.shared_buffers
5285                        .entry(guest_id)
5286                        .or_default()
5287                        .insert(buffer_id);
5288
5289                    let buffer = buffer.read(cx);
5290                    response.buffers.push(proto::BufferVersion {
5291                        id: buffer_id,
5292                        version: language::proto::serialize_version(&buffer.version),
5293                    });
5294
5295                    let operations = buffer.serialize_ops(Some(remote_version), cx);
5296                    let client = this.client.clone();
5297                    if let Some(file) = buffer.file() {
5298                        client
5299                            .send(proto::UpdateBufferFile {
5300                                project_id,
5301                                buffer_id: buffer_id as u64,
5302                                file: Some(file.to_proto()),
5303                            })
5304                            .log_err();
5305                    }
5306
5307                    client
5308                        .send(proto::UpdateDiffBase {
5309                            project_id,
5310                            buffer_id: buffer_id as u64,
5311                            diff_base: buffer.diff_base().map(Into::into),
5312                        })
5313                        .log_err();
5314
5315                    client
5316                        .send(proto::BufferReloaded {
5317                            project_id,
5318                            buffer_id,
5319                            version: language::proto::serialize_version(buffer.saved_version()),
5320                            mtime: Some(buffer.saved_mtime().into()),
5321                            fingerprint: language::proto::serialize_fingerprint(
5322                                buffer.saved_version_fingerprint(),
5323                            ),
5324                            line_ending: language::proto::serialize_line_ending(
5325                                buffer.line_ending(),
5326                            ) as i32,
5327                        })
5328                        .log_err();
5329
5330                    cx.background()
5331                        .spawn(
5332                            async move {
5333                                let operations = operations.await;
5334                                for chunk in split_operations(operations) {
5335                                    client
5336                                        .request(proto::UpdateBuffer {
5337                                            project_id,
5338                                            buffer_id,
5339                                            operations: chunk,
5340                                        })
5341                                        .await?;
5342                                }
5343                                anyhow::Ok(())
5344                            }
5345                            .log_err(),
5346                        )
5347                        .detach();
5348                }
5349            }
5350        });
5351
5352        Ok(response)
5353    }
5354
5355    async fn handle_format_buffers(
5356        this: ModelHandle<Self>,
5357        envelope: TypedEnvelope<proto::FormatBuffers>,
5358        _: Arc<Client>,
5359        mut cx: AsyncAppContext,
5360    ) -> Result<proto::FormatBuffersResponse> {
5361        let sender_id = envelope.original_sender_id()?;
5362        let format = this.update(&mut cx, |this, cx| {
5363            let mut buffers = HashSet::default();
5364            for buffer_id in &envelope.payload.buffer_ids {
5365                buffers.insert(
5366                    this.opened_buffers
5367                        .get(buffer_id)
5368                        .and_then(|buffer| buffer.upgrade(cx))
5369                        .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))?,
5370                );
5371            }
5372            let trigger = FormatTrigger::from_proto(envelope.payload.trigger);
5373            Ok::<_, anyhow::Error>(this.format(buffers, false, trigger, cx))
5374        })?;
5375
5376        let project_transaction = format.await?;
5377        let project_transaction = this.update(&mut cx, |this, cx| {
5378            this.serialize_project_transaction_for_peer(project_transaction, sender_id, cx)
5379        });
5380        Ok(proto::FormatBuffersResponse {
5381            transaction: Some(project_transaction),
5382        })
5383    }
5384
5385    async fn handle_apply_additional_edits_for_completion(
5386        this: ModelHandle<Self>,
5387        envelope: TypedEnvelope<proto::ApplyCompletionAdditionalEdits>,
5388        _: Arc<Client>,
5389        mut cx: AsyncAppContext,
5390    ) -> Result<proto::ApplyCompletionAdditionalEditsResponse> {
5391        let (buffer, completion) = this.update(&mut cx, |this, cx| {
5392            let buffer = this
5393                .opened_buffers
5394                .get(&envelope.payload.buffer_id)
5395                .and_then(|buffer| buffer.upgrade(cx))
5396                .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))?;
5397            let language = buffer.read(cx).language();
5398            let completion = language::proto::deserialize_completion(
5399                envelope
5400                    .payload
5401                    .completion
5402                    .ok_or_else(|| anyhow!("invalid completion"))?,
5403                language.cloned(),
5404            );
5405            Ok::<_, anyhow::Error>((buffer, completion))
5406        })?;
5407
5408        let completion = completion.await?;
5409
5410        let apply_additional_edits = this.update(&mut cx, |this, cx| {
5411            this.apply_additional_edits_for_completion(buffer, completion, false, cx)
5412        });
5413
5414        Ok(proto::ApplyCompletionAdditionalEditsResponse {
5415            transaction: apply_additional_edits
5416                .await?
5417                .as_ref()
5418                .map(language::proto::serialize_transaction),
5419        })
5420    }
5421
5422    async fn handle_apply_code_action(
5423        this: ModelHandle<Self>,
5424        envelope: TypedEnvelope<proto::ApplyCodeAction>,
5425        _: Arc<Client>,
5426        mut cx: AsyncAppContext,
5427    ) -> Result<proto::ApplyCodeActionResponse> {
5428        let sender_id = envelope.original_sender_id()?;
5429        let action = language::proto::deserialize_code_action(
5430            envelope
5431                .payload
5432                .action
5433                .ok_or_else(|| anyhow!("invalid action"))?,
5434        )?;
5435        let apply_code_action = this.update(&mut cx, |this, cx| {
5436            let buffer = this
5437                .opened_buffers
5438                .get(&envelope.payload.buffer_id)
5439                .and_then(|buffer| buffer.upgrade(cx))
5440                .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))?;
5441            Ok::<_, anyhow::Error>(this.apply_code_action(buffer, action, false, cx))
5442        })?;
5443
5444        let project_transaction = apply_code_action.await?;
5445        let project_transaction = this.update(&mut cx, |this, cx| {
5446            this.serialize_project_transaction_for_peer(project_transaction, sender_id, cx)
5447        });
5448        Ok(proto::ApplyCodeActionResponse {
5449            transaction: Some(project_transaction),
5450        })
5451    }
5452
5453    async fn handle_lsp_command<T: LspCommand>(
5454        this: ModelHandle<Self>,
5455        envelope: TypedEnvelope<T::ProtoRequest>,
5456        _: Arc<Client>,
5457        mut cx: AsyncAppContext,
5458    ) -> Result<<T::ProtoRequest as proto::RequestMessage>::Response>
5459    where
5460        <T::LspRequest as lsp::request::Request>::Result: Send,
5461    {
5462        let sender_id = envelope.original_sender_id()?;
5463        let buffer_id = T::buffer_id_from_proto(&envelope.payload);
5464        let buffer_handle = this.read_with(&cx, |this, _| {
5465            this.opened_buffers
5466                .get(&buffer_id)
5467                .and_then(|buffer| buffer.upgrade(&cx))
5468                .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))
5469        })?;
5470        let request = T::from_proto(
5471            envelope.payload,
5472            this.clone(),
5473            buffer_handle.clone(),
5474            cx.clone(),
5475        )
5476        .await?;
5477        let buffer_version = buffer_handle.read_with(&cx, |buffer, _| buffer.version());
5478        let response = this
5479            .update(&mut cx, |this, cx| {
5480                this.request_lsp(buffer_handle, request, cx)
5481            })
5482            .await?;
5483        this.update(&mut cx, |this, cx| {
5484            Ok(T::response_to_proto(
5485                response,
5486                this,
5487                sender_id,
5488                &buffer_version,
5489                cx,
5490            ))
5491        })
5492    }
5493
5494    async fn handle_get_project_symbols(
5495        this: ModelHandle<Self>,
5496        envelope: TypedEnvelope<proto::GetProjectSymbols>,
5497        _: Arc<Client>,
5498        mut cx: AsyncAppContext,
5499    ) -> Result<proto::GetProjectSymbolsResponse> {
5500        let symbols = this
5501            .update(&mut cx, |this, cx| {
5502                this.symbols(&envelope.payload.query, cx)
5503            })
5504            .await?;
5505
5506        Ok(proto::GetProjectSymbolsResponse {
5507            symbols: symbols.iter().map(serialize_symbol).collect(),
5508        })
5509    }
5510
5511    async fn handle_search_project(
5512        this: ModelHandle<Self>,
5513        envelope: TypedEnvelope<proto::SearchProject>,
5514        _: Arc<Client>,
5515        mut cx: AsyncAppContext,
5516    ) -> Result<proto::SearchProjectResponse> {
5517        let peer_id = envelope.original_sender_id()?;
5518        let query = SearchQuery::from_proto(envelope.payload)?;
5519        let result = this
5520            .update(&mut cx, |this, cx| this.search(query, cx))
5521            .await?;
5522
5523        this.update(&mut cx, |this, cx| {
5524            let mut locations = Vec::new();
5525            for (buffer, ranges) in result {
5526                for range in ranges {
5527                    let start = serialize_anchor(&range.start);
5528                    let end = serialize_anchor(&range.end);
5529                    let buffer_id = this.create_buffer_for_peer(&buffer, peer_id, cx);
5530                    locations.push(proto::Location {
5531                        buffer_id,
5532                        start: Some(start),
5533                        end: Some(end),
5534                    });
5535                }
5536            }
5537            Ok(proto::SearchProjectResponse { locations })
5538        })
5539    }
5540
5541    async fn handle_open_buffer_for_symbol(
5542        this: ModelHandle<Self>,
5543        envelope: TypedEnvelope<proto::OpenBufferForSymbol>,
5544        _: Arc<Client>,
5545        mut cx: AsyncAppContext,
5546    ) -> Result<proto::OpenBufferForSymbolResponse> {
5547        let peer_id = envelope.original_sender_id()?;
5548        let symbol = envelope
5549            .payload
5550            .symbol
5551            .ok_or_else(|| anyhow!("invalid symbol"))?;
5552        let symbol = this
5553            .read_with(&cx, |this, _| this.deserialize_symbol(symbol))
5554            .await?;
5555        let symbol = this.read_with(&cx, |this, _| {
5556            let signature = this.symbol_signature(&symbol.path);
5557            if signature == symbol.signature {
5558                Ok(symbol)
5559            } else {
5560                Err(anyhow!("invalid symbol signature"))
5561            }
5562        })?;
5563        let buffer = this
5564            .update(&mut cx, |this, cx| this.open_buffer_for_symbol(&symbol, cx))
5565            .await?;
5566
5567        Ok(proto::OpenBufferForSymbolResponse {
5568            buffer_id: this.update(&mut cx, |this, cx| {
5569                this.create_buffer_for_peer(&buffer, peer_id, cx)
5570            }),
5571        })
5572    }
5573
5574    fn symbol_signature(&self, project_path: &ProjectPath) -> [u8; 32] {
5575        let mut hasher = Sha256::new();
5576        hasher.update(project_path.worktree_id.to_proto().to_be_bytes());
5577        hasher.update(project_path.path.to_string_lossy().as_bytes());
5578        hasher.update(self.nonce.to_be_bytes());
5579        hasher.finalize().as_slice().try_into().unwrap()
5580    }
5581
5582    async fn handle_open_buffer_by_id(
5583        this: ModelHandle<Self>,
5584        envelope: TypedEnvelope<proto::OpenBufferById>,
5585        _: Arc<Client>,
5586        mut cx: AsyncAppContext,
5587    ) -> Result<proto::OpenBufferResponse> {
5588        let peer_id = envelope.original_sender_id()?;
5589        let buffer = this
5590            .update(&mut cx, |this, cx| {
5591                this.open_buffer_by_id(envelope.payload.id, cx)
5592            })
5593            .await?;
5594        this.update(&mut cx, |this, cx| {
5595            Ok(proto::OpenBufferResponse {
5596                buffer_id: this.create_buffer_for_peer(&buffer, peer_id, cx),
5597            })
5598        })
5599    }
5600
5601    async fn handle_open_buffer_by_path(
5602        this: ModelHandle<Self>,
5603        envelope: TypedEnvelope<proto::OpenBufferByPath>,
5604        _: Arc<Client>,
5605        mut cx: AsyncAppContext,
5606    ) -> Result<proto::OpenBufferResponse> {
5607        let peer_id = envelope.original_sender_id()?;
5608        let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
5609        let open_buffer = this.update(&mut cx, |this, cx| {
5610            this.open_buffer(
5611                ProjectPath {
5612                    worktree_id,
5613                    path: PathBuf::from(envelope.payload.path).into(),
5614                },
5615                cx,
5616            )
5617        });
5618
5619        let buffer = open_buffer.await?;
5620        this.update(&mut cx, |this, cx| {
5621            Ok(proto::OpenBufferResponse {
5622                buffer_id: this.create_buffer_for_peer(&buffer, peer_id, cx),
5623            })
5624        })
5625    }
5626
5627    fn serialize_project_transaction_for_peer(
5628        &mut self,
5629        project_transaction: ProjectTransaction,
5630        peer_id: proto::PeerId,
5631        cx: &mut AppContext,
5632    ) -> proto::ProjectTransaction {
5633        let mut serialized_transaction = proto::ProjectTransaction {
5634            buffer_ids: Default::default(),
5635            transactions: Default::default(),
5636        };
5637        for (buffer, transaction) in project_transaction.0 {
5638            serialized_transaction
5639                .buffer_ids
5640                .push(self.create_buffer_for_peer(&buffer, peer_id, cx));
5641            serialized_transaction
5642                .transactions
5643                .push(language::proto::serialize_transaction(&transaction));
5644        }
5645        serialized_transaction
5646    }
5647
5648    fn deserialize_project_transaction(
5649        &mut self,
5650        message: proto::ProjectTransaction,
5651        push_to_history: bool,
5652        cx: &mut ModelContext<Self>,
5653    ) -> Task<Result<ProjectTransaction>> {
5654        cx.spawn(|this, mut cx| async move {
5655            let mut project_transaction = ProjectTransaction::default();
5656            for (buffer_id, transaction) in message.buffer_ids.into_iter().zip(message.transactions)
5657            {
5658                let buffer = this
5659                    .update(&mut cx, |this, cx| {
5660                        this.wait_for_remote_buffer(buffer_id, cx)
5661                    })
5662                    .await?;
5663                let transaction = language::proto::deserialize_transaction(transaction)?;
5664                project_transaction.0.insert(buffer, transaction);
5665            }
5666
5667            for (buffer, transaction) in &project_transaction.0 {
5668                buffer
5669                    .update(&mut cx, |buffer, _| {
5670                        buffer.wait_for_edits(transaction.edit_ids.iter().copied())
5671                    })
5672                    .await?;
5673
5674                if push_to_history {
5675                    buffer.update(&mut cx, |buffer, _| {
5676                        buffer.push_transaction(transaction.clone(), Instant::now());
5677                    });
5678                }
5679            }
5680
5681            Ok(project_transaction)
5682        })
5683    }
5684
5685    fn create_buffer_for_peer(
5686        &mut self,
5687        buffer: &ModelHandle<Buffer>,
5688        peer_id: proto::PeerId,
5689        cx: &mut AppContext,
5690    ) -> u64 {
5691        let buffer_id = buffer.read(cx).remote_id();
5692        if let Some(ProjectClientState::Local { updates_tx, .. }) = &self.client_state {
5693            updates_tx
5694                .unbounded_send(LocalProjectUpdate::CreateBufferForPeer { peer_id, buffer_id })
5695                .ok();
5696        }
5697        buffer_id
5698    }
5699
5700    fn wait_for_remote_buffer(
5701        &mut self,
5702        id: u64,
5703        cx: &mut ModelContext<Self>,
5704    ) -> Task<Result<ModelHandle<Buffer>>> {
5705        let mut opened_buffer_rx = self.opened_buffer.1.clone();
5706
5707        cx.spawn_weak(|this, mut cx| async move {
5708            let buffer = loop {
5709                let Some(this) = this.upgrade(&cx) else {
5710                    return Err(anyhow!("project dropped"));
5711                };
5712                let buffer = this.read_with(&cx, |this, cx| {
5713                    this.opened_buffers
5714                        .get(&id)
5715                        .and_then(|buffer| buffer.upgrade(cx))
5716                });
5717                if let Some(buffer) = buffer {
5718                    break buffer;
5719                } else if this.read_with(&cx, |this, _| this.is_read_only()) {
5720                    return Err(anyhow!("disconnected before buffer {} could be opened", id));
5721                }
5722
5723                this.update(&mut cx, |this, _| {
5724                    this.incomplete_remote_buffers.entry(id).or_default();
5725                });
5726                drop(this);
5727                opened_buffer_rx
5728                    .next()
5729                    .await
5730                    .ok_or_else(|| anyhow!("project dropped while waiting for buffer"))?;
5731            };
5732            buffer.update(&mut cx, |buffer, cx| buffer.git_diff_recalc(cx));
5733            Ok(buffer)
5734        })
5735    }
5736
5737    fn synchronize_remote_buffers(&mut self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
5738        let project_id = match self.client_state.as_ref() {
5739            Some(ProjectClientState::Remote {
5740                sharing_has_stopped,
5741                remote_id,
5742                ..
5743            }) => {
5744                if *sharing_has_stopped {
5745                    return Task::ready(Err(anyhow!(
5746                        "can't synchronize remote buffers on a readonly project"
5747                    )));
5748                } else {
5749                    *remote_id
5750                }
5751            }
5752            Some(ProjectClientState::Local { .. }) | None => {
5753                return Task::ready(Err(anyhow!(
5754                    "can't synchronize remote buffers on a local project"
5755                )))
5756            }
5757        };
5758
5759        let client = self.client.clone();
5760        cx.spawn(|this, cx| async move {
5761            let (buffers, incomplete_buffer_ids) = this.read_with(&cx, |this, cx| {
5762                let buffers = this
5763                    .opened_buffers
5764                    .iter()
5765                    .filter_map(|(id, buffer)| {
5766                        let buffer = buffer.upgrade(cx)?;
5767                        Some(proto::BufferVersion {
5768                            id: *id,
5769                            version: language::proto::serialize_version(&buffer.read(cx).version),
5770                        })
5771                    })
5772                    .collect();
5773                let incomplete_buffer_ids = this
5774                    .incomplete_remote_buffers
5775                    .keys()
5776                    .copied()
5777                    .collect::<Vec<_>>();
5778
5779                (buffers, incomplete_buffer_ids)
5780            });
5781            let response = client
5782                .request(proto::SynchronizeBuffers {
5783                    project_id,
5784                    buffers,
5785                })
5786                .await?;
5787
5788            let send_updates_for_buffers = response.buffers.into_iter().map(|buffer| {
5789                let client = client.clone();
5790                let buffer_id = buffer.id;
5791                let remote_version = language::proto::deserialize_version(&buffer.version);
5792                this.read_with(&cx, |this, cx| {
5793                    if let Some(buffer) = this.buffer_for_id(buffer_id, cx) {
5794                        let operations = buffer.read(cx).serialize_ops(Some(remote_version), cx);
5795                        cx.background().spawn(async move {
5796                            let operations = operations.await;
5797                            for chunk in split_operations(operations) {
5798                                client
5799                                    .request(proto::UpdateBuffer {
5800                                        project_id,
5801                                        buffer_id,
5802                                        operations: chunk,
5803                                    })
5804                                    .await?;
5805                            }
5806                            anyhow::Ok(())
5807                        })
5808                    } else {
5809                        Task::ready(Ok(()))
5810                    }
5811                })
5812            });
5813
5814            // Any incomplete buffers have open requests waiting. Request that the host sends
5815            // creates these buffers for us again to unblock any waiting futures.
5816            for id in incomplete_buffer_ids {
5817                cx.background()
5818                    .spawn(client.request(proto::OpenBufferById { project_id, id }))
5819                    .detach();
5820            }
5821
5822            futures::future::join_all(send_updates_for_buffers)
5823                .await
5824                .into_iter()
5825                .collect()
5826        })
5827    }
5828
5829    pub fn worktree_metadata_protos(&self, cx: &AppContext) -> Vec<proto::WorktreeMetadata> {
5830        self.worktrees(cx)
5831            .map(|worktree| {
5832                let worktree = worktree.read(cx);
5833                proto::WorktreeMetadata {
5834                    id: worktree.id().to_proto(),
5835                    root_name: worktree.root_name().into(),
5836                    visible: worktree.is_visible(),
5837                    abs_path: worktree.abs_path().to_string_lossy().into(),
5838                }
5839            })
5840            .collect()
5841    }
5842
5843    fn set_worktrees_from_proto(
5844        &mut self,
5845        worktrees: Vec<proto::WorktreeMetadata>,
5846        cx: &mut ModelContext<Project>,
5847    ) -> Result<()> {
5848        let replica_id = self.replica_id();
5849        let remote_id = self.remote_id().ok_or_else(|| anyhow!("invalid project"))?;
5850
5851        let mut old_worktrees_by_id = self
5852            .worktrees
5853            .drain(..)
5854            .filter_map(|worktree| {
5855                let worktree = worktree.upgrade(cx)?;
5856                Some((worktree.read(cx).id(), worktree))
5857            })
5858            .collect::<HashMap<_, _>>();
5859
5860        for worktree in worktrees {
5861            if let Some(old_worktree) =
5862                old_worktrees_by_id.remove(&WorktreeId::from_proto(worktree.id))
5863            {
5864                self.worktrees.push(WorktreeHandle::Strong(old_worktree));
5865            } else {
5866                let worktree =
5867                    Worktree::remote(remote_id, replica_id, worktree, self.client.clone(), cx);
5868                let _ = self.add_worktree(&worktree, cx);
5869            }
5870        }
5871
5872        self.metadata_changed(cx);
5873        for (id, _) in old_worktrees_by_id {
5874            cx.emit(Event::WorktreeRemoved(id));
5875        }
5876
5877        Ok(())
5878    }
5879
5880    fn set_collaborators_from_proto(
5881        &mut self,
5882        messages: Vec<proto::Collaborator>,
5883        cx: &mut ModelContext<Self>,
5884    ) -> Result<()> {
5885        let mut collaborators = HashMap::default();
5886        for message in messages {
5887            let collaborator = Collaborator::from_proto(message)?;
5888            collaborators.insert(collaborator.peer_id, collaborator);
5889        }
5890        for old_peer_id in self.collaborators.keys() {
5891            if !collaborators.contains_key(old_peer_id) {
5892                cx.emit(Event::CollaboratorLeft(*old_peer_id));
5893            }
5894        }
5895        self.collaborators = collaborators;
5896        Ok(())
5897    }
5898
5899    fn deserialize_symbol(
5900        &self,
5901        serialized_symbol: proto::Symbol,
5902    ) -> impl Future<Output = Result<Symbol>> {
5903        let languages = self.languages.clone();
5904        async move {
5905            let source_worktree_id = WorktreeId::from_proto(serialized_symbol.source_worktree_id);
5906            let worktree_id = WorktreeId::from_proto(serialized_symbol.worktree_id);
5907            let start = serialized_symbol
5908                .start
5909                .ok_or_else(|| anyhow!("invalid start"))?;
5910            let end = serialized_symbol
5911                .end
5912                .ok_or_else(|| anyhow!("invalid end"))?;
5913            let kind = unsafe { mem::transmute(serialized_symbol.kind) };
5914            let path = ProjectPath {
5915                worktree_id,
5916                path: PathBuf::from(serialized_symbol.path).into(),
5917            };
5918            let language = languages
5919                .language_for_file(&path.path, None)
5920                .await
5921                .log_err();
5922            Ok(Symbol {
5923                language_server_name: LanguageServerName(
5924                    serialized_symbol.language_server_name.into(),
5925                ),
5926                source_worktree_id,
5927                path,
5928                label: {
5929                    match language {
5930                        Some(language) => {
5931                            language
5932                                .label_for_symbol(&serialized_symbol.name, kind)
5933                                .await
5934                        }
5935                        None => None,
5936                    }
5937                    .unwrap_or_else(|| CodeLabel::plain(serialized_symbol.name.clone(), None))
5938                },
5939
5940                name: serialized_symbol.name,
5941                range: Unclipped(PointUtf16::new(start.row, start.column))
5942                    ..Unclipped(PointUtf16::new(end.row, end.column)),
5943                kind,
5944                signature: serialized_symbol
5945                    .signature
5946                    .try_into()
5947                    .map_err(|_| anyhow!("invalid signature"))?,
5948            })
5949        }
5950    }
5951
5952    async fn handle_buffer_saved(
5953        this: ModelHandle<Self>,
5954        envelope: TypedEnvelope<proto::BufferSaved>,
5955        _: Arc<Client>,
5956        mut cx: AsyncAppContext,
5957    ) -> Result<()> {
5958        let fingerprint = deserialize_fingerprint(&envelope.payload.fingerprint)?;
5959        let version = deserialize_version(&envelope.payload.version);
5960        let mtime = envelope
5961            .payload
5962            .mtime
5963            .ok_or_else(|| anyhow!("missing mtime"))?
5964            .into();
5965
5966        this.update(&mut cx, |this, cx| {
5967            let buffer = this
5968                .opened_buffers
5969                .get(&envelope.payload.buffer_id)
5970                .and_then(|buffer| buffer.upgrade(cx))
5971                .or_else(|| {
5972                    this.incomplete_remote_buffers
5973                        .get(&envelope.payload.buffer_id)
5974                        .and_then(|b| b.clone())
5975                });
5976            if let Some(buffer) = buffer {
5977                buffer.update(cx, |buffer, cx| {
5978                    buffer.did_save(version, fingerprint, mtime, cx);
5979                });
5980            }
5981            Ok(())
5982        })
5983    }
5984
5985    async fn handle_buffer_reloaded(
5986        this: ModelHandle<Self>,
5987        envelope: TypedEnvelope<proto::BufferReloaded>,
5988        _: Arc<Client>,
5989        mut cx: AsyncAppContext,
5990    ) -> Result<()> {
5991        let payload = envelope.payload;
5992        let version = deserialize_version(&payload.version);
5993        let fingerprint = deserialize_fingerprint(&payload.fingerprint)?;
5994        let line_ending = deserialize_line_ending(
5995            proto::LineEnding::from_i32(payload.line_ending)
5996                .ok_or_else(|| anyhow!("missing line ending"))?,
5997        );
5998        let mtime = payload
5999            .mtime
6000            .ok_or_else(|| anyhow!("missing mtime"))?
6001            .into();
6002        this.update(&mut cx, |this, cx| {
6003            let buffer = this
6004                .opened_buffers
6005                .get(&payload.buffer_id)
6006                .and_then(|buffer| buffer.upgrade(cx))
6007                .or_else(|| {
6008                    this.incomplete_remote_buffers
6009                        .get(&payload.buffer_id)
6010                        .cloned()
6011                        .flatten()
6012                });
6013            if let Some(buffer) = buffer {
6014                buffer.update(cx, |buffer, cx| {
6015                    buffer.did_reload(version, fingerprint, line_ending, mtime, cx);
6016                });
6017            }
6018            Ok(())
6019        })
6020    }
6021
6022    #[allow(clippy::type_complexity)]
6023    fn edits_from_lsp(
6024        &mut self,
6025        buffer: &ModelHandle<Buffer>,
6026        lsp_edits: impl 'static + Send + IntoIterator<Item = lsp::TextEdit>,
6027        version: Option<i32>,
6028        cx: &mut ModelContext<Self>,
6029    ) -> Task<Result<Vec<(Range<Anchor>, String)>>> {
6030        let snapshot = self.buffer_snapshot_for_lsp_version(buffer, version, cx);
6031        cx.background().spawn(async move {
6032            let snapshot = snapshot?;
6033            let mut lsp_edits = lsp_edits
6034                .into_iter()
6035                .map(|edit| (range_from_lsp(edit.range), edit.new_text))
6036                .collect::<Vec<_>>();
6037            lsp_edits.sort_by_key(|(range, _)| range.start);
6038
6039            let mut lsp_edits = lsp_edits.into_iter().peekable();
6040            let mut edits = Vec::new();
6041            while let Some((range, mut new_text)) = lsp_edits.next() {
6042                // Clip invalid ranges provided by the language server.
6043                let mut range = snapshot.clip_point_utf16(range.start, Bias::Left)
6044                    ..snapshot.clip_point_utf16(range.end, Bias::Left);
6045
6046                // Combine any LSP edits that are adjacent.
6047                //
6048                // Also, combine LSP edits that are separated from each other by only
6049                // a newline. This is important because for some code actions,
6050                // Rust-analyzer rewrites the entire buffer via a series of edits that
6051                // are separated by unchanged newline characters.
6052                //
6053                // In order for the diffing logic below to work properly, any edits that
6054                // cancel each other out must be combined into one.
6055                while let Some((next_range, next_text)) = lsp_edits.peek() {
6056                    if next_range.start.0 > range.end {
6057                        if next_range.start.0.row > range.end.row + 1
6058                            || next_range.start.0.column > 0
6059                            || snapshot.clip_point_utf16(
6060                                Unclipped(PointUtf16::new(range.end.row, u32::MAX)),
6061                                Bias::Left,
6062                            ) > range.end
6063                        {
6064                            break;
6065                        }
6066                        new_text.push('\n');
6067                    }
6068                    range.end = snapshot.clip_point_utf16(next_range.end, Bias::Left);
6069                    new_text.push_str(next_text);
6070                    lsp_edits.next();
6071                }
6072
6073                // For multiline edits, perform a diff of the old and new text so that
6074                // we can identify the changes more precisely, preserving the locations
6075                // of any anchors positioned in the unchanged regions.
6076                if range.end.row > range.start.row {
6077                    let mut offset = range.start.to_offset(&snapshot);
6078                    let old_text = snapshot.text_for_range(range).collect::<String>();
6079
6080                    let diff = TextDiff::from_lines(old_text.as_str(), &new_text);
6081                    let mut moved_since_edit = true;
6082                    for change in diff.iter_all_changes() {
6083                        let tag = change.tag();
6084                        let value = change.value();
6085                        match tag {
6086                            ChangeTag::Equal => {
6087                                offset += value.len();
6088                                moved_since_edit = true;
6089                            }
6090                            ChangeTag::Delete => {
6091                                let start = snapshot.anchor_after(offset);
6092                                let end = snapshot.anchor_before(offset + value.len());
6093                                if moved_since_edit {
6094                                    edits.push((start..end, String::new()));
6095                                } else {
6096                                    edits.last_mut().unwrap().0.end = end;
6097                                }
6098                                offset += value.len();
6099                                moved_since_edit = false;
6100                            }
6101                            ChangeTag::Insert => {
6102                                if moved_since_edit {
6103                                    let anchor = snapshot.anchor_after(offset);
6104                                    edits.push((anchor..anchor, value.to_string()));
6105                                } else {
6106                                    edits.last_mut().unwrap().1.push_str(value);
6107                                }
6108                                moved_since_edit = false;
6109                            }
6110                        }
6111                    }
6112                } else if range.end == range.start {
6113                    let anchor = snapshot.anchor_after(range.start);
6114                    edits.push((anchor..anchor, new_text));
6115                } else {
6116                    let edit_start = snapshot.anchor_after(range.start);
6117                    let edit_end = snapshot.anchor_before(range.end);
6118                    edits.push((edit_start..edit_end, new_text));
6119                }
6120            }
6121
6122            Ok(edits)
6123        })
6124    }
6125
6126    fn buffer_snapshot_for_lsp_version(
6127        &mut self,
6128        buffer: &ModelHandle<Buffer>,
6129        version: Option<i32>,
6130        cx: &AppContext,
6131    ) -> Result<TextBufferSnapshot> {
6132        const OLD_VERSIONS_TO_RETAIN: i32 = 10;
6133
6134        if let Some(version) = version {
6135            let buffer_id = buffer.read(cx).remote_id();
6136            let snapshots = self
6137                .buffer_snapshots
6138                .get_mut(&buffer_id)
6139                .ok_or_else(|| anyhow!("no snapshot found for buffer {}", buffer_id))?;
6140            let found_snapshot = snapshots
6141                .binary_search_by_key(&version, |e| e.0)
6142                .map(|ix| snapshots[ix].1.clone())
6143                .map_err(|_| {
6144                    anyhow!(
6145                        "snapshot not found for buffer {} at version {}",
6146                        buffer_id,
6147                        version
6148                    )
6149                })?;
6150            snapshots.retain(|(snapshot_version, _)| {
6151                snapshot_version + OLD_VERSIONS_TO_RETAIN >= version
6152            });
6153            Ok(found_snapshot)
6154        } else {
6155            Ok((buffer.read(cx)).text_snapshot())
6156        }
6157    }
6158
6159    fn language_server_for_buffer(
6160        &self,
6161        buffer: &Buffer,
6162        cx: &AppContext,
6163    ) -> Option<(&Arc<CachedLspAdapter>, &Arc<LanguageServer>)> {
6164        let server_id = self.language_server_id_for_buffer(buffer, cx)?;
6165        let server = self.language_servers.get(&server_id)?;
6166        if let LanguageServerState::Running {
6167            adapter, server, ..
6168        } = server
6169        {
6170            Some((adapter, server))
6171        } else {
6172            None
6173        }
6174    }
6175
6176    fn language_server_id_for_buffer(&self, buffer: &Buffer, cx: &AppContext) -> Option<usize> {
6177        if let Some((file, language)) = File::from_dyn(buffer.file()).zip(buffer.language()) {
6178            let name = language.lsp_adapter()?.name.clone();
6179            let worktree_id = file.worktree_id(cx);
6180            let key = (worktree_id, name);
6181            self.language_server_ids.get(&key).copied()
6182        } else {
6183            None
6184        }
6185    }
6186}
6187
6188impl WorktreeHandle {
6189    pub fn upgrade(&self, cx: &AppContext) -> Option<ModelHandle<Worktree>> {
6190        match self {
6191            WorktreeHandle::Strong(handle) => Some(handle.clone()),
6192            WorktreeHandle::Weak(handle) => handle.upgrade(cx),
6193        }
6194    }
6195}
6196
6197impl OpenBuffer {
6198    pub fn upgrade(&self, cx: &impl UpgradeModelHandle) -> Option<ModelHandle<Buffer>> {
6199        match self {
6200            OpenBuffer::Strong(handle) => Some(handle.clone()),
6201            OpenBuffer::Weak(handle) => handle.upgrade(cx),
6202            OpenBuffer::Operations(_) => None,
6203        }
6204    }
6205}
6206
6207pub struct PathMatchCandidateSet {
6208    pub snapshot: Snapshot,
6209    pub include_ignored: bool,
6210    pub include_root_name: bool,
6211}
6212
6213impl<'a> fuzzy::PathMatchCandidateSet<'a> for PathMatchCandidateSet {
6214    type Candidates = PathMatchCandidateSetIter<'a>;
6215
6216    fn id(&self) -> usize {
6217        self.snapshot.id().to_usize()
6218    }
6219
6220    fn len(&self) -> usize {
6221        if self.include_ignored {
6222            self.snapshot.file_count()
6223        } else {
6224            self.snapshot.visible_file_count()
6225        }
6226    }
6227
6228    fn prefix(&self) -> Arc<str> {
6229        if self.snapshot.root_entry().map_or(false, |e| e.is_file()) {
6230            self.snapshot.root_name().into()
6231        } else if self.include_root_name {
6232            format!("{}/", self.snapshot.root_name()).into()
6233        } else {
6234            "".into()
6235        }
6236    }
6237
6238    fn candidates(&'a self, start: usize) -> Self::Candidates {
6239        PathMatchCandidateSetIter {
6240            traversal: self.snapshot.files(self.include_ignored, start),
6241        }
6242    }
6243}
6244
6245pub struct PathMatchCandidateSetIter<'a> {
6246    traversal: Traversal<'a>,
6247}
6248
6249impl<'a> Iterator for PathMatchCandidateSetIter<'a> {
6250    type Item = fuzzy::PathMatchCandidate<'a>;
6251
6252    fn next(&mut self) -> Option<Self::Item> {
6253        self.traversal.next().map(|entry| {
6254            if let EntryKind::File(char_bag) = entry.kind {
6255                fuzzy::PathMatchCandidate {
6256                    path: &entry.path,
6257                    char_bag,
6258                }
6259            } else {
6260                unreachable!()
6261            }
6262        })
6263    }
6264}
6265
6266impl Entity for Project {
6267    type Event = Event;
6268
6269    fn release(&mut self, cx: &mut gpui::AppContext) {
6270        match &self.client_state {
6271            Some(ProjectClientState::Local { .. }) => {
6272                let _ = self.unshare_internal(cx);
6273            }
6274            Some(ProjectClientState::Remote { remote_id, .. }) => {
6275                let _ = self.client.send(proto::LeaveProject {
6276                    project_id: *remote_id,
6277                });
6278                self.disconnected_from_host_internal(cx);
6279            }
6280            _ => {}
6281        }
6282    }
6283
6284    fn app_will_quit(
6285        &mut self,
6286        _: &mut AppContext,
6287    ) -> Option<std::pin::Pin<Box<dyn 'static + Future<Output = ()>>>> {
6288        let shutdown_futures = self
6289            .language_servers
6290            .drain()
6291            .map(|(_, server_state)| async {
6292                match server_state {
6293                    LanguageServerState::Running { server, .. } => server.shutdown()?.await,
6294                    LanguageServerState::Starting(starting_server) => {
6295                        starting_server.await?.shutdown()?.await
6296                    }
6297                }
6298            })
6299            .collect::<Vec<_>>();
6300
6301        Some(
6302            async move {
6303                futures::future::join_all(shutdown_futures).await;
6304            }
6305            .boxed(),
6306        )
6307    }
6308}
6309
6310impl Collaborator {
6311    fn from_proto(message: proto::Collaborator) -> Result<Self> {
6312        Ok(Self {
6313            peer_id: message.peer_id.ok_or_else(|| anyhow!("invalid peer id"))?,
6314            replica_id: message.replica_id as ReplicaId,
6315        })
6316    }
6317}
6318
6319impl<P: AsRef<Path>> From<(WorktreeId, P)> for ProjectPath {
6320    fn from((worktree_id, path): (WorktreeId, P)) -> Self {
6321        Self {
6322            worktree_id,
6323            path: path.as_ref().into(),
6324        }
6325    }
6326}
6327
6328fn split_operations(
6329    mut operations: Vec<proto::Operation>,
6330) -> impl Iterator<Item = Vec<proto::Operation>> {
6331    #[cfg(any(test, feature = "test-support"))]
6332    const CHUNK_SIZE: usize = 5;
6333
6334    #[cfg(not(any(test, feature = "test-support")))]
6335    const CHUNK_SIZE: usize = 100;
6336
6337    let mut done = false;
6338    std::iter::from_fn(move || {
6339        if done {
6340            return None;
6341        }
6342
6343        let operations = operations
6344            .drain(..cmp::min(CHUNK_SIZE, operations.len()))
6345            .collect::<Vec<_>>();
6346        if operations.is_empty() {
6347            done = true;
6348        }
6349        Some(operations)
6350    })
6351}
6352
6353fn serialize_symbol(symbol: &Symbol) -> proto::Symbol {
6354    proto::Symbol {
6355        language_server_name: symbol.language_server_name.0.to_string(),
6356        source_worktree_id: symbol.source_worktree_id.to_proto(),
6357        worktree_id: symbol.path.worktree_id.to_proto(),
6358        path: symbol.path.path.to_string_lossy().to_string(),
6359        name: symbol.name.clone(),
6360        kind: unsafe { mem::transmute(symbol.kind) },
6361        start: Some(proto::PointUtf16 {
6362            row: symbol.range.start.0.row,
6363            column: symbol.range.start.0.column,
6364        }),
6365        end: Some(proto::PointUtf16 {
6366            row: symbol.range.end.0.row,
6367            column: symbol.range.end.0.column,
6368        }),
6369        signature: symbol.signature.to_vec(),
6370    }
6371}
6372
6373fn relativize_path(base: &Path, path: &Path) -> PathBuf {
6374    let mut path_components = path.components();
6375    let mut base_components = base.components();
6376    let mut components: Vec<Component> = Vec::new();
6377    loop {
6378        match (path_components.next(), base_components.next()) {
6379            (None, None) => break,
6380            (Some(a), None) => {
6381                components.push(a);
6382                components.extend(path_components.by_ref());
6383                break;
6384            }
6385            (None, _) => components.push(Component::ParentDir),
6386            (Some(a), Some(b)) if components.is_empty() && a == b => (),
6387            (Some(a), Some(b)) if b == Component::CurDir => components.push(a),
6388            (Some(a), Some(_)) => {
6389                components.push(Component::ParentDir);
6390                for _ in base_components {
6391                    components.push(Component::ParentDir);
6392                }
6393                components.push(a);
6394                components.extend(path_components.by_ref());
6395                break;
6396            }
6397        }
6398    }
6399    components.iter().map(|c| c.as_os_str()).collect()
6400}
6401
6402impl Item for Buffer {
6403    fn entry_id(&self, cx: &AppContext) -> Option<ProjectEntryId> {
6404        File::from_dyn(self.file()).and_then(|file| file.project_entry_id(cx))
6405    }
6406
6407    fn project_path(&self, cx: &AppContext) -> Option<ProjectPath> {
6408        File::from_dyn(self.file()).map(|file| ProjectPath {
6409            worktree_id: file.worktree_id(cx),
6410            path: file.path().clone(),
6411        })
6412    }
6413}