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