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