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