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