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 fuzzy::{PathMatch, PathMatchCandidate, PathMatchCandidateSet};
  17use gpui::{
  18    AnyModelHandle, AppContext, AsyncAppContext, Entity, ModelContext, ModelHandle,
  19    MutableAppContext, Task, UpgradeModelHandle, WeakModelHandle,
  20};
  21use language::{
  22    point_to_lsp,
  23    proto::{
  24        deserialize_anchor, deserialize_line_ending, deserialize_version, serialize_anchor,
  25        serialize_version,
  26    },
  27    range_from_lsp, range_to_lsp, Anchor, Bias, Buffer, CharKind, CodeAction, CodeLabel,
  28    Completion, Diagnostic, DiagnosticEntry, DiagnosticSet, Event as BufferEvent, File as _,
  29    Language, LanguageRegistry, LanguageServerName, LineEnding, LocalFile, LspAdapter,
  30    OffsetRangeExt, Operation, Patch, PointUtf16, TextBufferSnapshot, ToOffset, ToPointUtf16,
  31    Transaction,
  32};
  33use lsp::{
  34    DiagnosticSeverity, DiagnosticTag, DocumentHighlightKind, LanguageServer, LanguageString,
  35    MarkedString,
  36};
  37use lsp_command::*;
  38use parking_lot::Mutex;
  39use postage::stream::Stream;
  40use postage::watch;
  41use rand::prelude::*;
  42use search::SearchQuery;
  43use serde::Serialize;
  44use settings::Settings;
  45use sha2::{Digest, Sha256};
  46use similar::{ChangeTag, TextDiff};
  47use std::{
  48    cell::RefCell,
  49    cmp::{self, Ordering},
  50    convert::TryInto,
  51    ffi::OsString,
  52    hash::Hash,
  53    mem,
  54    num::NonZeroU32,
  55    ops::Range,
  56    os::unix::{ffi::OsStrExt, prelude::OsStringExt},
  57    path::{Component, Path, PathBuf},
  58    rc::Rc,
  59    str,
  60    sync::{
  61        atomic::{AtomicBool, AtomicUsize, Ordering::SeqCst},
  62        Arc,
  63    },
  64    time::Instant,
  65};
  66use thiserror::Error;
  67use util::{post_inc, ResultExt, TryFutureExt as _};
  68
  69pub use db::Db;
  70pub use fs::*;
  71pub use worktree::*;
  72
  73pub trait Item: Entity {
  74    fn entry_id(&self, cx: &AppContext) -> Option<ProjectEntryId>;
  75}
  76
  77pub struct ProjectStore {
  78    db: Arc<Db>,
  79    projects: Vec<WeakModelHandle<Project>>,
  80}
  81
  82// Language server state is stored across 3 collections:
  83//     language_servers =>
  84//         a mapping from unique server id to LanguageServerState which can either be a task for a
  85//         server in the process of starting, or a running server with adapter and language server arcs
  86//     language_server_ids => a mapping from worktreeId and server name to the unique server id
  87//     language_server_statuses => a mapping from unique server id to the current server status
  88//
  89// Multiple worktrees can map to the same language server for example when you jump to the definition
  90// of a file in the standard library. So language_server_ids is used to look up which server is active
  91// for a given worktree and language server name
  92//
  93// When starting a language server, first the id map is checked to make sure a server isn't already available
  94// for that worktree. If there is one, it finishes early. Otherwise, a new id is allocated and and
  95// the Starting variant of LanguageServerState is stored in the language_servers map.
  96pub struct Project {
  97    worktrees: Vec<WorktreeHandle>,
  98    active_entry: Option<ProjectEntryId>,
  99    languages: Arc<LanguageRegistry>,
 100    language_servers: HashMap<usize, LanguageServerState>,
 101    language_server_ids: HashMap<(WorktreeId, LanguageServerName), usize>,
 102    language_server_statuses: BTreeMap<usize, LanguageServerStatus>,
 103    language_server_settings: Arc<Mutex<serde_json::Value>>,
 104    last_workspace_edits_by_language_server: HashMap<usize, ProjectTransaction>,
 105    next_language_server_id: usize,
 106    client: Arc<client::Client>,
 107    next_entry_id: Arc<AtomicUsize>,
 108    next_diagnostic_group_id: usize,
 109    user_store: ModelHandle<UserStore>,
 110    project_store: ModelHandle<ProjectStore>,
 111    fs: Arc<dyn Fs>,
 112    client_state: ProjectClientState,
 113    collaborators: HashMap<PeerId, Collaborator>,
 114    client_subscriptions: Vec<client::Subscription>,
 115    _subscriptions: Vec<gpui::Subscription>,
 116    opened_buffer: (Rc<RefCell<watch::Sender<()>>>, watch::Receiver<()>),
 117    shared_buffers: HashMap<PeerId, HashSet<u64>>,
 118    loading_buffers: HashMap<
 119        ProjectPath,
 120        postage::watch::Receiver<Option<Result<ModelHandle<Buffer>, Arc<anyhow::Error>>>>,
 121    >,
 122    loading_local_worktrees:
 123        HashMap<Arc<Path>, Shared<Task<Result<ModelHandle<Worktree>, Arc<anyhow::Error>>>>>,
 124    opened_buffers: HashMap<u64, OpenBuffer>,
 125    buffer_snapshots: HashMap<u64, Vec<(i32, TextBufferSnapshot)>>,
 126    nonce: u128,
 127    initialized_persistent_state: bool,
 128    _maintain_buffer_languages: Task<()>,
 129}
 130
 131#[derive(Error, Debug)]
 132pub enum JoinProjectError {
 133    #[error("host declined join request")]
 134    HostDeclined,
 135    #[error("host closed the project")]
 136    HostClosedProject,
 137    #[error("host went offline")]
 138    HostWentOffline,
 139    #[error("{0}")]
 140    Other(#[from] anyhow::Error),
 141}
 142
 143enum OpenBuffer {
 144    Strong(ModelHandle<Buffer>),
 145    Weak(WeakModelHandle<Buffer>),
 146    Loading(Vec<Operation>),
 147}
 148
 149enum WorktreeHandle {
 150    Strong(ModelHandle<Worktree>),
 151    Weak(WeakModelHandle<Worktree>),
 152}
 153
 154enum ProjectClientState {
 155    Local {
 156        is_shared: bool,
 157        remote_id_tx: watch::Sender<Option<u64>>,
 158        remote_id_rx: watch::Receiver<Option<u64>>,
 159        online_tx: watch::Sender<bool>,
 160        online_rx: watch::Receiver<bool>,
 161        _maintain_remote_id: Task<Option<()>>,
 162        _maintain_online_status: Task<Option<()>>,
 163    },
 164    Remote {
 165        sharing_has_stopped: bool,
 166        remote_id: u64,
 167        replica_id: ReplicaId,
 168        _detect_unshare: Task<Option<()>>,
 169    },
 170}
 171
 172#[derive(Clone, Debug)]
 173pub struct Collaborator {
 174    pub user: Arc<User>,
 175    pub peer_id: PeerId,
 176    pub replica_id: ReplicaId,
 177}
 178
 179#[derive(Clone, Debug, PartialEq, Eq)]
 180pub enum Event {
 181    ActiveEntryChanged(Option<ProjectEntryId>),
 182    WorktreeAdded,
 183    WorktreeRemoved(WorktreeId),
 184    DiskBasedDiagnosticsStarted {
 185        language_server_id: usize,
 186    },
 187    DiskBasedDiagnosticsFinished {
 188        language_server_id: usize,
 189    },
 190    DiagnosticsUpdated {
 191        path: ProjectPath,
 192        language_server_id: usize,
 193    },
 194    RemoteIdChanged(Option<u64>),
 195    CollaboratorLeft(PeerId),
 196    ContactRequestedJoin(Arc<User>),
 197    ContactCancelledJoinRequest(Arc<User>),
 198}
 199
 200pub enum LanguageServerState {
 201    Starting(Task<Option<Arc<LanguageServer>>>),
 202    Running {
 203        adapter: Arc<LspAdapter>,
 204        server: Arc<LanguageServer>,
 205    },
 206}
 207
 208#[derive(Serialize)]
 209pub struct LanguageServerStatus {
 210    pub name: String,
 211    pub pending_work: BTreeMap<String, LanguageServerProgress>,
 212    pub has_pending_diagnostic_updates: bool,
 213    progress_tokens: HashSet<String>,
 214}
 215
 216#[derive(Clone, Debug, Serialize)]
 217pub struct LanguageServerProgress {
 218    pub message: Option<String>,
 219    pub percentage: Option<usize>,
 220    #[serde(skip_serializing)]
 221    pub last_update_at: Instant,
 222}
 223
 224#[derive(Clone, Debug, Eq, PartialEq, Hash, PartialOrd, Ord)]
 225pub struct ProjectPath {
 226    pub worktree_id: WorktreeId,
 227    pub path: Arc<Path>,
 228}
 229
 230#[derive(Copy, Clone, Debug, Default, PartialEq, Serialize)]
 231pub struct DiagnosticSummary {
 232    pub language_server_id: usize,
 233    pub error_count: usize,
 234    pub warning_count: usize,
 235}
 236
 237#[derive(Debug, Clone)]
 238pub struct Location {
 239    pub buffer: ModelHandle<Buffer>,
 240    pub range: Range<language::Anchor>,
 241}
 242
 243#[derive(Debug, Clone)]
 244pub struct LocationLink {
 245    pub origin: Option<Location>,
 246    pub target: Location,
 247}
 248
 249#[derive(Debug)]
 250pub struct DocumentHighlight {
 251    pub range: Range<language::Anchor>,
 252    pub kind: DocumentHighlightKind,
 253}
 254
 255#[derive(Clone, Debug)]
 256pub struct Symbol {
 257    pub source_worktree_id: WorktreeId,
 258    pub worktree_id: WorktreeId,
 259    pub language_server_name: LanguageServerName,
 260    pub path: PathBuf,
 261    pub label: CodeLabel,
 262    pub name: String,
 263    pub kind: lsp::SymbolKind,
 264    pub range: Range<PointUtf16>,
 265    pub signature: [u8; 32],
 266}
 267
 268#[derive(Clone, Debug, PartialEq)]
 269pub struct HoverBlock {
 270    pub text: String,
 271    pub language: Option<String>,
 272}
 273
 274impl HoverBlock {
 275    fn try_new(marked_string: MarkedString) -> Option<Self> {
 276        let result = match marked_string {
 277            MarkedString::LanguageString(LanguageString { language, value }) => HoverBlock {
 278                text: value,
 279                language: Some(language),
 280            },
 281            MarkedString::String(text) => HoverBlock {
 282                text,
 283                language: None,
 284            },
 285        };
 286        if result.text.is_empty() {
 287            None
 288        } else {
 289            Some(result)
 290        }
 291    }
 292}
 293
 294#[derive(Debug)]
 295pub struct Hover {
 296    pub contents: Vec<HoverBlock>,
 297    pub range: Option<Range<language::Anchor>>,
 298}
 299
 300#[derive(Default)]
 301pub struct ProjectTransaction(pub HashMap<ModelHandle<Buffer>, language::Transaction>);
 302
 303impl DiagnosticSummary {
 304    fn new<'a, T: 'a>(
 305        language_server_id: usize,
 306        diagnostics: impl IntoIterator<Item = &'a DiagnosticEntry<T>>,
 307    ) -> Self {
 308        let mut this = Self {
 309            language_server_id,
 310            error_count: 0,
 311            warning_count: 0,
 312        };
 313
 314        for entry in diagnostics {
 315            if entry.diagnostic.is_primary {
 316                match entry.diagnostic.severity {
 317                    DiagnosticSeverity::ERROR => this.error_count += 1,
 318                    DiagnosticSeverity::WARNING => this.warning_count += 1,
 319                    _ => {}
 320                }
 321            }
 322        }
 323
 324        this
 325    }
 326
 327    pub fn is_empty(&self) -> bool {
 328        self.error_count == 0 && self.warning_count == 0
 329    }
 330
 331    pub fn to_proto(&self, path: &Path) -> proto::DiagnosticSummary {
 332        proto::DiagnosticSummary {
 333            path: path.to_string_lossy().to_string(),
 334            language_server_id: self.language_server_id as u64,
 335            error_count: self.error_count as u32,
 336            warning_count: self.warning_count as u32,
 337        }
 338    }
 339}
 340
 341#[derive(Clone, Copy, Debug, Default, Hash, PartialEq, Eq, PartialOrd, Ord)]
 342pub struct ProjectEntryId(usize);
 343
 344impl ProjectEntryId {
 345    pub const MAX: Self = Self(usize::MAX);
 346
 347    pub fn new(counter: &AtomicUsize) -> Self {
 348        Self(counter.fetch_add(1, SeqCst))
 349    }
 350
 351    pub fn from_proto(id: u64) -> Self {
 352        Self(id as usize)
 353    }
 354
 355    pub fn to_proto(&self) -> u64 {
 356        self.0 as u64
 357    }
 358
 359    pub fn to_usize(&self) -> usize {
 360        self.0
 361    }
 362}
 363
 364impl Project {
 365    pub fn init(client: &Arc<Client>) {
 366        client.add_model_message_handler(Self::handle_request_join_project);
 367        client.add_model_message_handler(Self::handle_add_collaborator);
 368        client.add_model_message_handler(Self::handle_buffer_reloaded);
 369        client.add_model_message_handler(Self::handle_buffer_saved);
 370        client.add_model_message_handler(Self::handle_start_language_server);
 371        client.add_model_message_handler(Self::handle_update_language_server);
 372        client.add_model_message_handler(Self::handle_remove_collaborator);
 373        client.add_model_message_handler(Self::handle_join_project_request_cancelled);
 374        client.add_model_message_handler(Self::handle_update_project);
 375        client.add_model_message_handler(Self::handle_unregister_project);
 376        client.add_model_message_handler(Self::handle_project_unshared);
 377        client.add_model_message_handler(Self::handle_update_buffer_file);
 378        client.add_model_message_handler(Self::handle_update_buffer);
 379        client.add_model_message_handler(Self::handle_update_diagnostic_summary);
 380        client.add_model_message_handler(Self::handle_update_worktree);
 381        client.add_model_request_handler(Self::handle_create_project_entry);
 382        client.add_model_request_handler(Self::handle_rename_project_entry);
 383        client.add_model_request_handler(Self::handle_copy_project_entry);
 384        client.add_model_request_handler(Self::handle_delete_project_entry);
 385        client.add_model_request_handler(Self::handle_apply_additional_edits_for_completion);
 386        client.add_model_request_handler(Self::handle_apply_code_action);
 387        client.add_model_request_handler(Self::handle_reload_buffers);
 388        client.add_model_request_handler(Self::handle_format_buffers);
 389        client.add_model_request_handler(Self::handle_get_code_actions);
 390        client.add_model_request_handler(Self::handle_get_completions);
 391        client.add_model_request_handler(Self::handle_lsp_command::<GetHover>);
 392        client.add_model_request_handler(Self::handle_lsp_command::<GetDefinition>);
 393        client.add_model_request_handler(Self::handle_lsp_command::<GetDocumentHighlights>);
 394        client.add_model_request_handler(Self::handle_lsp_command::<GetReferences>);
 395        client.add_model_request_handler(Self::handle_lsp_command::<PrepareRename>);
 396        client.add_model_request_handler(Self::handle_lsp_command::<PerformRename>);
 397        client.add_model_request_handler(Self::handle_search_project);
 398        client.add_model_request_handler(Self::handle_get_project_symbols);
 399        client.add_model_request_handler(Self::handle_open_buffer_for_symbol);
 400        client.add_model_request_handler(Self::handle_open_buffer_by_id);
 401        client.add_model_request_handler(Self::handle_open_buffer_by_path);
 402        client.add_model_request_handler(Self::handle_save_buffer);
 403    }
 404
 405    pub fn local(
 406        online: bool,
 407        client: Arc<Client>,
 408        user_store: ModelHandle<UserStore>,
 409        project_store: ModelHandle<ProjectStore>,
 410        languages: Arc<LanguageRegistry>,
 411        fs: Arc<dyn Fs>,
 412        cx: &mut MutableAppContext,
 413    ) -> ModelHandle<Self> {
 414        cx.add_model(|cx: &mut ModelContext<Self>| {
 415            let (remote_id_tx, remote_id_rx) = watch::channel();
 416            let _maintain_remote_id = cx.spawn_weak({
 417                let mut status_rx = client.clone().status();
 418                move |this, mut cx| async move {
 419                    while let Some(status) = status_rx.recv().await {
 420                        let this = this.upgrade(&cx)?;
 421                        if status.is_connected() {
 422                            this.update(&mut cx, |this, cx| this.register(cx))
 423                                .await
 424                                .log_err()?;
 425                        } else {
 426                            this.update(&mut cx, |this, cx| this.unregister(cx))
 427                                .await
 428                                .log_err();
 429                        }
 430                    }
 431                    None
 432                }
 433            });
 434
 435            let (online_tx, online_rx) = watch::channel_with(online);
 436            let _maintain_online_status = cx.spawn_weak({
 437                let mut online_rx = online_rx.clone();
 438                move |this, mut cx| async move {
 439                    while let Some(online) = online_rx.recv().await {
 440                        let this = this.upgrade(&cx)?;
 441                        this.update(&mut cx, |this, cx| {
 442                            if !online {
 443                                this.unshared(cx);
 444                            }
 445                            this.metadata_changed(false, cx)
 446                        });
 447                    }
 448                    None
 449                }
 450            });
 451
 452            let handle = cx.weak_handle();
 453            project_store.update(cx, |store, cx| store.add_project(handle, cx));
 454
 455            let (opened_buffer_tx, opened_buffer_rx) = watch::channel();
 456            Self {
 457                worktrees: Default::default(),
 458                collaborators: Default::default(),
 459                opened_buffers: Default::default(),
 460                shared_buffers: Default::default(),
 461                loading_buffers: Default::default(),
 462                loading_local_worktrees: Default::default(),
 463                buffer_snapshots: Default::default(),
 464                client_state: ProjectClientState::Local {
 465                    is_shared: false,
 466                    remote_id_tx,
 467                    remote_id_rx,
 468                    online_tx,
 469                    online_rx,
 470                    _maintain_remote_id,
 471                    _maintain_online_status,
 472                },
 473                opened_buffer: (Rc::new(RefCell::new(opened_buffer_tx)), opened_buffer_rx),
 474                client_subscriptions: Vec::new(),
 475                _subscriptions: vec![cx.observe_global::<Settings, _>(Self::on_settings_changed)],
 476                _maintain_buffer_languages: Self::maintain_buffer_languages(&languages, cx),
 477                active_entry: None,
 478                languages,
 479                client,
 480                user_store,
 481                project_store,
 482                fs,
 483                next_entry_id: Default::default(),
 484                next_diagnostic_group_id: Default::default(),
 485                language_servers: Default::default(),
 486                language_server_ids: Default::default(),
 487                language_server_statuses: Default::default(),
 488                last_workspace_edits_by_language_server: Default::default(),
 489                language_server_settings: Default::default(),
 490                next_language_server_id: 0,
 491                nonce: StdRng::from_entropy().gen(),
 492                initialized_persistent_state: false,
 493            }
 494        })
 495    }
 496
 497    pub async fn remote(
 498        remote_id: u64,
 499        client: Arc<Client>,
 500        user_store: ModelHandle<UserStore>,
 501        project_store: ModelHandle<ProjectStore>,
 502        languages: Arc<LanguageRegistry>,
 503        fs: Arc<dyn Fs>,
 504        mut cx: AsyncAppContext,
 505    ) -> Result<ModelHandle<Self>, JoinProjectError> {
 506        client.authenticate_and_connect(true, &cx).await?;
 507
 508        let response = client
 509            .request(proto::JoinProject {
 510                project_id: remote_id,
 511            })
 512            .await?;
 513
 514        let response = match response.variant.ok_or_else(|| anyhow!("missing variant"))? {
 515            proto::join_project_response::Variant::Accept(response) => response,
 516            proto::join_project_response::Variant::Decline(decline) => {
 517                match proto::join_project_response::decline::Reason::from_i32(decline.reason) {
 518                    Some(proto::join_project_response::decline::Reason::Declined) => {
 519                        Err(JoinProjectError::HostDeclined)?
 520                    }
 521                    Some(proto::join_project_response::decline::Reason::Closed) => {
 522                        Err(JoinProjectError::HostClosedProject)?
 523                    }
 524                    Some(proto::join_project_response::decline::Reason::WentOffline) => {
 525                        Err(JoinProjectError::HostWentOffline)?
 526                    }
 527                    None => Err(anyhow!("missing decline reason"))?,
 528                }
 529            }
 530        };
 531
 532        let replica_id = response.replica_id as ReplicaId;
 533
 534        let mut worktrees = Vec::new();
 535        for worktree in response.worktrees {
 536            let worktree = cx
 537                .update(|cx| Worktree::remote(remote_id, replica_id, worktree, client.clone(), cx));
 538            worktrees.push(worktree);
 539        }
 540
 541        let (opened_buffer_tx, opened_buffer_rx) = watch::channel();
 542        let this = cx.add_model(|cx: &mut ModelContext<Self>| {
 543            let handle = cx.weak_handle();
 544            project_store.update(cx, |store, cx| store.add_project(handle, cx));
 545
 546            let mut this = Self {
 547                worktrees: Vec::new(),
 548                loading_buffers: Default::default(),
 549                opened_buffer: (Rc::new(RefCell::new(opened_buffer_tx)), opened_buffer_rx),
 550                shared_buffers: Default::default(),
 551                loading_local_worktrees: Default::default(),
 552                active_entry: None,
 553                collaborators: Default::default(),
 554                _maintain_buffer_languages: Self::maintain_buffer_languages(&languages, cx),
 555                languages,
 556                user_store: user_store.clone(),
 557                project_store,
 558                fs,
 559                next_entry_id: Default::default(),
 560                next_diagnostic_group_id: Default::default(),
 561                client_subscriptions: vec![client.add_model_for_remote_entity(remote_id, cx)],
 562                _subscriptions: Default::default(),
 563                client: client.clone(),
 564                client_state: ProjectClientState::Remote {
 565                    sharing_has_stopped: false,
 566                    remote_id,
 567                    replica_id,
 568                    _detect_unshare: cx.spawn_weak(move |this, mut cx| {
 569                        async move {
 570                            let mut status = client.status();
 571                            let is_connected =
 572                                status.next().await.map_or(false, |s| s.is_connected());
 573                            // Even if we're initially connected, any future change of the status means we momentarily disconnected.
 574                            if !is_connected || status.next().await.is_some() {
 575                                if let Some(this) = this.upgrade(&cx) {
 576                                    this.update(&mut cx, |this, cx| this.removed_from_project(cx))
 577                                }
 578                            }
 579                            Ok(())
 580                        }
 581                        .log_err()
 582                    }),
 583                },
 584                language_servers: Default::default(),
 585                language_server_ids: Default::default(),
 586                language_server_settings: Default::default(),
 587                language_server_statuses: response
 588                    .language_servers
 589                    .into_iter()
 590                    .map(|server| {
 591                        (
 592                            server.id as usize,
 593                            LanguageServerStatus {
 594                                name: server.name,
 595                                pending_work: Default::default(),
 596                                has_pending_diagnostic_updates: false,
 597                                progress_tokens: Default::default(),
 598                            },
 599                        )
 600                    })
 601                    .collect(),
 602                last_workspace_edits_by_language_server: Default::default(),
 603                next_language_server_id: 0,
 604                opened_buffers: Default::default(),
 605                buffer_snapshots: Default::default(),
 606                nonce: StdRng::from_entropy().gen(),
 607                initialized_persistent_state: false,
 608            };
 609            for worktree in worktrees {
 610                this.add_worktree(&worktree, cx);
 611            }
 612            this
 613        });
 614
 615        let user_ids = response
 616            .collaborators
 617            .iter()
 618            .map(|peer| peer.user_id)
 619            .collect();
 620        user_store
 621            .update(&mut cx, |user_store, cx| user_store.get_users(user_ids, cx))
 622            .await?;
 623        let mut collaborators = HashMap::default();
 624        for message in response.collaborators {
 625            let collaborator = Collaborator::from_proto(message, &user_store, &mut cx).await?;
 626            collaborators.insert(collaborator.peer_id, collaborator);
 627        }
 628
 629        this.update(&mut cx, |this, _| {
 630            this.collaborators = collaborators;
 631        });
 632
 633        Ok(this)
 634    }
 635
 636    #[cfg(any(test, feature = "test-support"))]
 637    pub async fn test(
 638        fs: Arc<dyn Fs>,
 639        root_paths: impl IntoIterator<Item = &Path>,
 640        cx: &mut gpui::TestAppContext,
 641    ) -> ModelHandle<Project> {
 642        if !cx.read(|cx| cx.has_global::<Settings>()) {
 643            cx.update(|cx| cx.set_global(Settings::test(cx)));
 644        }
 645
 646        let languages = Arc::new(LanguageRegistry::test());
 647        let http_client = client::test::FakeHttpClient::with_404_response();
 648        let client = client::Client::new(http_client.clone());
 649        let user_store = cx.add_model(|cx| UserStore::new(client.clone(), http_client, cx));
 650        let project_store = cx.add_model(|_| ProjectStore::new(Db::open_fake()));
 651        let project = cx.update(|cx| {
 652            Project::local(true, client, user_store, project_store, languages, fs, cx)
 653        });
 654        for path in root_paths {
 655            let (tree, _) = project
 656                .update(cx, |project, cx| {
 657                    project.find_or_create_local_worktree(path, true, cx)
 658                })
 659                .await
 660                .unwrap();
 661            tree.read_with(cx, |tree, _| tree.as_local().unwrap().scan_complete())
 662                .await;
 663        }
 664        project
 665    }
 666
 667    pub fn restore_state(&mut self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
 668        if self.is_remote() {
 669            return Task::ready(Ok(()));
 670        }
 671
 672        let db = self.project_store.read(cx).db.clone();
 673        let keys = self.db_keys_for_online_state(cx);
 674        let online_by_default = cx.global::<Settings>().projects_online_by_default;
 675        let read_online = cx.background().spawn(async move {
 676            let values = db.read(keys)?;
 677            anyhow::Ok(
 678                values
 679                    .into_iter()
 680                    .all(|e| e.map_or(online_by_default, |e| e == [true as u8])),
 681            )
 682        });
 683        cx.spawn(|this, mut cx| async move {
 684            let online = read_online.await.log_err().unwrap_or(false);
 685            this.update(&mut cx, |this, cx| {
 686                this.initialized_persistent_state = true;
 687                if let ProjectClientState::Local { online_tx, .. } = &mut this.client_state {
 688                    let mut online_tx = online_tx.borrow_mut();
 689                    if *online_tx != online {
 690                        *online_tx = online;
 691                        drop(online_tx);
 692                        this.metadata_changed(false, cx);
 693                    }
 694                }
 695            });
 696            Ok(())
 697        })
 698    }
 699
 700    fn persist_state(&mut self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
 701        if self.is_remote() || !self.initialized_persistent_state {
 702            return Task::ready(Ok(()));
 703        }
 704
 705        let db = self.project_store.read(cx).db.clone();
 706        let keys = self.db_keys_for_online_state(cx);
 707        let is_online = self.is_online();
 708        cx.background().spawn(async move {
 709            let value = &[is_online as u8];
 710            db.write(keys.into_iter().map(|key| (key, value)))
 711        })
 712    }
 713
 714    fn on_settings_changed(&mut self, cx: &mut ModelContext<Self>) {
 715        let settings = cx.global::<Settings>();
 716
 717        let mut language_servers_to_start = Vec::new();
 718        for buffer in self.opened_buffers.values() {
 719            if let Some(buffer) = buffer.upgrade(cx) {
 720                let buffer = buffer.read(cx);
 721                if let Some((file, language)) = File::from_dyn(buffer.file()).zip(buffer.language())
 722                {
 723                    if settings.enable_language_server(Some(&language.name())) {
 724                        let worktree = file.worktree.read(cx);
 725                        language_servers_to_start.push((
 726                            worktree.id(),
 727                            worktree.as_local().unwrap().abs_path().clone(),
 728                            language.clone(),
 729                        ));
 730                    }
 731                }
 732            }
 733        }
 734
 735        let mut language_servers_to_stop = Vec::new();
 736        for language in self.languages.to_vec() {
 737            if let Some(lsp_adapter) = language.lsp_adapter() {
 738                if !settings.enable_language_server(Some(&language.name())) {
 739                    let lsp_name = &lsp_adapter.name;
 740                    for (worktree_id, started_lsp_name) in self.language_server_ids.keys() {
 741                        if lsp_name == started_lsp_name {
 742                            language_servers_to_stop.push((*worktree_id, started_lsp_name.clone()));
 743                        }
 744                    }
 745                }
 746            }
 747        }
 748
 749        // Stop all newly-disabled language servers.
 750        for (worktree_id, adapter_name) in language_servers_to_stop {
 751            self.stop_language_server(worktree_id, adapter_name, cx)
 752                .detach();
 753        }
 754
 755        // Start all the newly-enabled language servers.
 756        for (worktree_id, worktree_path, language) in language_servers_to_start {
 757            self.start_language_server(worktree_id, worktree_path, language, cx);
 758        }
 759
 760        cx.notify();
 761    }
 762
 763    pub fn buffer_for_id(&self, remote_id: u64, cx: &AppContext) -> Option<ModelHandle<Buffer>> {
 764        self.opened_buffers
 765            .get(&remote_id)
 766            .and_then(|buffer| buffer.upgrade(cx))
 767    }
 768
 769    pub fn languages(&self) -> &Arc<LanguageRegistry> {
 770        &self.languages
 771    }
 772
 773    pub fn client(&self) -> Arc<Client> {
 774        self.client.clone()
 775    }
 776
 777    pub fn user_store(&self) -> ModelHandle<UserStore> {
 778        self.user_store.clone()
 779    }
 780
 781    pub fn project_store(&self) -> ModelHandle<ProjectStore> {
 782        self.project_store.clone()
 783    }
 784
 785    #[cfg(any(test, feature = "test-support"))]
 786    pub fn check_invariants(&self, cx: &AppContext) {
 787        if self.is_local() {
 788            let mut worktree_root_paths = HashMap::default();
 789            for worktree in self.worktrees(cx) {
 790                let worktree = worktree.read(cx);
 791                let abs_path = worktree.as_local().unwrap().abs_path().clone();
 792                let prev_worktree_id = worktree_root_paths.insert(abs_path.clone(), worktree.id());
 793                assert_eq!(
 794                    prev_worktree_id,
 795                    None,
 796                    "abs path {:?} for worktree {:?} is not unique ({:?} was already registered with the same path)",
 797                    abs_path,
 798                    worktree.id(),
 799                    prev_worktree_id
 800                )
 801            }
 802        } else {
 803            let replica_id = self.replica_id();
 804            for buffer in self.opened_buffers.values() {
 805                if let Some(buffer) = buffer.upgrade(cx) {
 806                    let buffer = buffer.read(cx);
 807                    assert_eq!(
 808                        buffer.deferred_ops_len(),
 809                        0,
 810                        "replica {}, buffer {} has deferred operations",
 811                        replica_id,
 812                        buffer.remote_id()
 813                    );
 814                }
 815            }
 816        }
 817    }
 818
 819    #[cfg(any(test, feature = "test-support"))]
 820    pub fn has_open_buffer(&self, path: impl Into<ProjectPath>, cx: &AppContext) -> bool {
 821        let path = path.into();
 822        if let Some(worktree) = self.worktree_for_id(path.worktree_id, cx) {
 823            self.opened_buffers.iter().any(|(_, buffer)| {
 824                if let Some(buffer) = buffer.upgrade(cx) {
 825                    if let Some(file) = File::from_dyn(buffer.read(cx).file()) {
 826                        if file.worktree == worktree && file.path() == &path.path {
 827                            return true;
 828                        }
 829                    }
 830                }
 831                false
 832            })
 833        } else {
 834            false
 835        }
 836    }
 837
 838    pub fn fs(&self) -> &Arc<dyn Fs> {
 839        &self.fs
 840    }
 841
 842    pub fn set_online(&mut self, online: bool, _: &mut ModelContext<Self>) {
 843        if let ProjectClientState::Local { online_tx, .. } = &mut self.client_state {
 844            let mut online_tx = online_tx.borrow_mut();
 845            if *online_tx != online {
 846                *online_tx = online;
 847            }
 848        }
 849    }
 850
 851    pub fn is_online(&self) -> bool {
 852        match &self.client_state {
 853            ProjectClientState::Local { online_rx, .. } => *online_rx.borrow(),
 854            ProjectClientState::Remote { .. } => true,
 855        }
 856    }
 857
 858    fn unregister(&mut self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
 859        self.unshared(cx);
 860        if let ProjectClientState::Local { remote_id_rx, .. } = &mut self.client_state {
 861            if let Some(remote_id) = *remote_id_rx.borrow() {
 862                let request = self.client.request(proto::UnregisterProject {
 863                    project_id: remote_id,
 864                });
 865                return cx.spawn(|this, mut cx| async move {
 866                    let response = request.await;
 867
 868                    // Unregistering the project causes the server to send out a
 869                    // contact update removing this project from the host's list
 870                    // of online projects. Wait until this contact update has been
 871                    // processed before clearing out this project's remote id, so
 872                    // that there is no moment where this project appears in the
 873                    // contact metadata and *also* has no remote id.
 874                    this.update(&mut cx, |this, cx| {
 875                        this.user_store()
 876                            .update(cx, |store, _| store.contact_updates_done())
 877                    })
 878                    .await;
 879
 880                    this.update(&mut cx, |this, cx| {
 881                        if let ProjectClientState::Local { remote_id_tx, .. } =
 882                            &mut this.client_state
 883                        {
 884                            *remote_id_tx.borrow_mut() = None;
 885                        }
 886                        this.client_subscriptions.clear();
 887                        this.metadata_changed(false, cx);
 888                    });
 889                    response.map(drop)
 890                });
 891            }
 892        }
 893        Task::ready(Ok(()))
 894    }
 895
 896    fn register(&mut self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
 897        if let ProjectClientState::Local {
 898            remote_id_rx,
 899            online_rx,
 900            ..
 901        } = &self.client_state
 902        {
 903            if remote_id_rx.borrow().is_some() {
 904                return Task::ready(Ok(()));
 905            }
 906
 907            let response = self.client.request(proto::RegisterProject {
 908                online: *online_rx.borrow(),
 909            });
 910            cx.spawn(|this, mut cx| async move {
 911                let remote_id = response.await?.project_id;
 912                this.update(&mut cx, |this, cx| {
 913                    if let ProjectClientState::Local { remote_id_tx, .. } = &mut this.client_state {
 914                        *remote_id_tx.borrow_mut() = Some(remote_id);
 915                    }
 916
 917                    this.metadata_changed(false, cx);
 918                    cx.emit(Event::RemoteIdChanged(Some(remote_id)));
 919                    this.client_subscriptions
 920                        .push(this.client.add_model_for_remote_entity(remote_id, cx));
 921                    Ok(())
 922                })
 923            })
 924        } else {
 925            Task::ready(Err(anyhow!("can't register a remote project")))
 926        }
 927    }
 928
 929    pub fn remote_id(&self) -> Option<u64> {
 930        match &self.client_state {
 931            ProjectClientState::Local { remote_id_rx, .. } => *remote_id_rx.borrow(),
 932            ProjectClientState::Remote { remote_id, .. } => Some(*remote_id),
 933        }
 934    }
 935
 936    pub fn next_remote_id(&self) -> impl Future<Output = u64> {
 937        let mut id = None;
 938        let mut watch = None;
 939        match &self.client_state {
 940            ProjectClientState::Local { remote_id_rx, .. } => watch = Some(remote_id_rx.clone()),
 941            ProjectClientState::Remote { remote_id, .. } => id = Some(*remote_id),
 942        }
 943
 944        async move {
 945            if let Some(id) = id {
 946                return id;
 947            }
 948            let mut watch = watch.unwrap();
 949            loop {
 950                let id = *watch.borrow();
 951                if let Some(id) = id {
 952                    return id;
 953                }
 954                watch.next().await;
 955            }
 956        }
 957    }
 958
 959    pub fn shared_remote_id(&self) -> Option<u64> {
 960        match &self.client_state {
 961            ProjectClientState::Local {
 962                remote_id_rx,
 963                is_shared,
 964                ..
 965            } => {
 966                if *is_shared {
 967                    *remote_id_rx.borrow()
 968                } else {
 969                    None
 970                }
 971            }
 972            ProjectClientState::Remote { remote_id, .. } => Some(*remote_id),
 973        }
 974    }
 975
 976    pub fn replica_id(&self) -> ReplicaId {
 977        match &self.client_state {
 978            ProjectClientState::Local { .. } => 0,
 979            ProjectClientState::Remote { replica_id, .. } => *replica_id,
 980        }
 981    }
 982
 983    fn metadata_changed(&mut self, persist: bool, cx: &mut ModelContext<Self>) {
 984        if let ProjectClientState::Local {
 985            remote_id_rx,
 986            online_rx,
 987            ..
 988        } = &self.client_state
 989        {
 990            // Broadcast worktrees only if the project is online.
 991            let worktrees = if *online_rx.borrow() {
 992                self.worktrees
 993                    .iter()
 994                    .filter_map(|worktree| {
 995                        worktree
 996                            .upgrade(&cx)
 997                            .map(|worktree| worktree.read(cx).as_local().unwrap().metadata_proto())
 998                    })
 999                    .collect()
1000            } else {
1001                Default::default()
1002            };
1003            if let Some(project_id) = *remote_id_rx.borrow() {
1004                let online = *online_rx.borrow();
1005                self.client
1006                    .send(proto::UpdateProject {
1007                        project_id,
1008                        worktrees,
1009                        online,
1010                    })
1011                    .log_err();
1012
1013                if online {
1014                    let worktrees = self.visible_worktrees(cx).collect::<Vec<_>>();
1015                    let scans_complete =
1016                        futures::future::join_all(worktrees.iter().filter_map(|worktree| {
1017                            Some(worktree.read(cx).as_local()?.scan_complete())
1018                        }));
1019
1020                    let worktrees = worktrees.into_iter().map(|handle| handle.downgrade());
1021                    cx.spawn_weak(move |_, cx| async move {
1022                        scans_complete.await;
1023                        cx.read(|cx| {
1024                            for worktree in worktrees {
1025                                if let Some(worktree) = worktree
1026                                    .upgrade(cx)
1027                                    .and_then(|worktree| worktree.read(cx).as_local())
1028                                {
1029                                    worktree.send_extension_counts(project_id);
1030                                }
1031                            }
1032                        })
1033                    })
1034                    .detach();
1035                }
1036            }
1037
1038            self.project_store.update(cx, |_, cx| cx.notify());
1039            if persist {
1040                self.persist_state(cx).detach_and_log_err(cx);
1041            }
1042            cx.notify();
1043        }
1044    }
1045
1046    pub fn collaborators(&self) -> &HashMap<PeerId, Collaborator> {
1047        &self.collaborators
1048    }
1049
1050    pub fn worktrees<'a>(
1051        &'a self,
1052        cx: &'a AppContext,
1053    ) -> impl 'a + DoubleEndedIterator<Item = ModelHandle<Worktree>> {
1054        self.worktrees
1055            .iter()
1056            .filter_map(move |worktree| worktree.upgrade(cx))
1057    }
1058
1059    pub fn visible_worktrees<'a>(
1060        &'a self,
1061        cx: &'a AppContext,
1062    ) -> impl 'a + DoubleEndedIterator<Item = ModelHandle<Worktree>> {
1063        self.worktrees.iter().filter_map(|worktree| {
1064            worktree.upgrade(cx).and_then(|worktree| {
1065                if worktree.read(cx).is_visible() {
1066                    Some(worktree)
1067                } else {
1068                    None
1069                }
1070            })
1071        })
1072    }
1073
1074    pub fn worktree_root_names<'a>(&'a self, cx: &'a AppContext) -> impl Iterator<Item = &'a str> {
1075        self.visible_worktrees(cx)
1076            .map(|tree| tree.read(cx).root_name())
1077    }
1078
1079    fn db_keys_for_online_state(&self, cx: &AppContext) -> Vec<String> {
1080        self.worktrees
1081            .iter()
1082            .filter_map(|worktree| {
1083                let worktree = worktree.upgrade(&cx)?.read(cx);
1084                if worktree.is_visible() {
1085                    Some(format!(
1086                        "project-path-online:{}",
1087                        worktree.as_local().unwrap().abs_path().to_string_lossy()
1088                    ))
1089                } else {
1090                    None
1091                }
1092            })
1093            .collect::<Vec<_>>()
1094    }
1095
1096    pub fn worktree_for_id(
1097        &self,
1098        id: WorktreeId,
1099        cx: &AppContext,
1100    ) -> Option<ModelHandle<Worktree>> {
1101        self.worktrees(cx)
1102            .find(|worktree| worktree.read(cx).id() == id)
1103    }
1104
1105    pub fn worktree_for_entry(
1106        &self,
1107        entry_id: ProjectEntryId,
1108        cx: &AppContext,
1109    ) -> Option<ModelHandle<Worktree>> {
1110        self.worktrees(cx)
1111            .find(|worktree| worktree.read(cx).contains_entry(entry_id))
1112    }
1113
1114    pub fn worktree_id_for_entry(
1115        &self,
1116        entry_id: ProjectEntryId,
1117        cx: &AppContext,
1118    ) -> Option<WorktreeId> {
1119        self.worktree_for_entry(entry_id, cx)
1120            .map(|worktree| worktree.read(cx).id())
1121    }
1122
1123    pub fn contains_paths(&self, paths: &[PathBuf], cx: &AppContext) -> bool {
1124        paths.iter().all(|path| self.contains_path(&path, cx))
1125    }
1126
1127    pub fn contains_path(&self, path: &Path, cx: &AppContext) -> bool {
1128        for worktree in self.worktrees(cx) {
1129            let worktree = worktree.read(cx).as_local();
1130            if worktree.map_or(false, |w| w.contains_abs_path(path)) {
1131                return true;
1132            }
1133        }
1134        false
1135    }
1136
1137    pub fn create_entry(
1138        &mut self,
1139        project_path: impl Into<ProjectPath>,
1140        is_directory: bool,
1141        cx: &mut ModelContext<Self>,
1142    ) -> Option<Task<Result<Entry>>> {
1143        let project_path = project_path.into();
1144        let worktree = self.worktree_for_id(project_path.worktree_id, cx)?;
1145        if self.is_local() {
1146            Some(worktree.update(cx, |worktree, cx| {
1147                worktree
1148                    .as_local_mut()
1149                    .unwrap()
1150                    .create_entry(project_path.path, is_directory, cx)
1151            }))
1152        } else {
1153            let client = self.client.clone();
1154            let project_id = self.remote_id().unwrap();
1155            Some(cx.spawn_weak(|_, mut cx| async move {
1156                let response = client
1157                    .request(proto::CreateProjectEntry {
1158                        worktree_id: project_path.worktree_id.to_proto(),
1159                        project_id,
1160                        path: project_path.path.as_os_str().as_bytes().to_vec(),
1161                        is_directory,
1162                    })
1163                    .await?;
1164                let entry = response
1165                    .entry
1166                    .ok_or_else(|| anyhow!("missing entry in response"))?;
1167                worktree
1168                    .update(&mut cx, |worktree, cx| {
1169                        worktree.as_remote_mut().unwrap().insert_entry(
1170                            entry,
1171                            response.worktree_scan_id as usize,
1172                            cx,
1173                        )
1174                    })
1175                    .await
1176            }))
1177        }
1178    }
1179
1180    pub fn copy_entry(
1181        &mut self,
1182        entry_id: ProjectEntryId,
1183        new_path: impl Into<Arc<Path>>,
1184        cx: &mut ModelContext<Self>,
1185    ) -> Option<Task<Result<Entry>>> {
1186        let worktree = self.worktree_for_entry(entry_id, cx)?;
1187        let new_path = new_path.into();
1188        if self.is_local() {
1189            worktree.update(cx, |worktree, cx| {
1190                worktree
1191                    .as_local_mut()
1192                    .unwrap()
1193                    .copy_entry(entry_id, new_path, cx)
1194            })
1195        } else {
1196            let client = self.client.clone();
1197            let project_id = self.remote_id().unwrap();
1198
1199            Some(cx.spawn_weak(|_, mut cx| async move {
1200                let response = client
1201                    .request(proto::CopyProjectEntry {
1202                        project_id,
1203                        entry_id: entry_id.to_proto(),
1204                        new_path: new_path.as_os_str().as_bytes().to_vec(),
1205                    })
1206                    .await?;
1207                let entry = response
1208                    .entry
1209                    .ok_or_else(|| anyhow!("missing entry in response"))?;
1210                worktree
1211                    .update(&mut cx, |worktree, cx| {
1212                        worktree.as_remote_mut().unwrap().insert_entry(
1213                            entry,
1214                            response.worktree_scan_id as usize,
1215                            cx,
1216                        )
1217                    })
1218                    .await
1219            }))
1220        }
1221    }
1222
1223    pub fn rename_entry(
1224        &mut self,
1225        entry_id: ProjectEntryId,
1226        new_path: impl Into<Arc<Path>>,
1227        cx: &mut ModelContext<Self>,
1228    ) -> Option<Task<Result<Entry>>> {
1229        let worktree = self.worktree_for_entry(entry_id, cx)?;
1230        let new_path = new_path.into();
1231        if self.is_local() {
1232            worktree.update(cx, |worktree, cx| {
1233                worktree
1234                    .as_local_mut()
1235                    .unwrap()
1236                    .rename_entry(entry_id, new_path, cx)
1237            })
1238        } else {
1239            let client = self.client.clone();
1240            let project_id = self.remote_id().unwrap();
1241
1242            Some(cx.spawn_weak(|_, mut cx| async move {
1243                let response = client
1244                    .request(proto::RenameProjectEntry {
1245                        project_id,
1246                        entry_id: entry_id.to_proto(),
1247                        new_path: new_path.as_os_str().as_bytes().to_vec(),
1248                    })
1249                    .await?;
1250                let entry = response
1251                    .entry
1252                    .ok_or_else(|| anyhow!("missing entry in response"))?;
1253                worktree
1254                    .update(&mut cx, |worktree, cx| {
1255                        worktree.as_remote_mut().unwrap().insert_entry(
1256                            entry,
1257                            response.worktree_scan_id as usize,
1258                            cx,
1259                        )
1260                    })
1261                    .await
1262            }))
1263        }
1264    }
1265
1266    pub fn delete_entry(
1267        &mut self,
1268        entry_id: ProjectEntryId,
1269        cx: &mut ModelContext<Self>,
1270    ) -> Option<Task<Result<()>>> {
1271        let worktree = self.worktree_for_entry(entry_id, cx)?;
1272        if self.is_local() {
1273            worktree.update(cx, |worktree, cx| {
1274                worktree.as_local_mut().unwrap().delete_entry(entry_id, cx)
1275            })
1276        } else {
1277            let client = self.client.clone();
1278            let project_id = self.remote_id().unwrap();
1279            Some(cx.spawn_weak(|_, mut cx| async move {
1280                let response = client
1281                    .request(proto::DeleteProjectEntry {
1282                        project_id,
1283                        entry_id: entry_id.to_proto(),
1284                    })
1285                    .await?;
1286                worktree
1287                    .update(&mut cx, move |worktree, cx| {
1288                        worktree.as_remote_mut().unwrap().delete_entry(
1289                            entry_id,
1290                            response.worktree_scan_id as usize,
1291                            cx,
1292                        )
1293                    })
1294                    .await
1295            }))
1296        }
1297    }
1298
1299    fn share(&mut self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
1300        if !self.is_online() {
1301            return Task::ready(Err(anyhow!("can't share an offline project")));
1302        }
1303
1304        let project_id;
1305        if let ProjectClientState::Local {
1306            remote_id_rx,
1307            is_shared,
1308            ..
1309        } = &mut self.client_state
1310        {
1311            if *is_shared {
1312                return Task::ready(Ok(()));
1313            }
1314            *is_shared = true;
1315            if let Some(id) = *remote_id_rx.borrow() {
1316                project_id = id;
1317            } else {
1318                return Task::ready(Err(anyhow!("project hasn't been registered")));
1319            }
1320        } else {
1321            return Task::ready(Err(anyhow!("can't share a remote project")));
1322        };
1323
1324        for open_buffer in self.opened_buffers.values_mut() {
1325            match open_buffer {
1326                OpenBuffer::Strong(_) => {}
1327                OpenBuffer::Weak(buffer) => {
1328                    if let Some(buffer) = buffer.upgrade(cx) {
1329                        *open_buffer = OpenBuffer::Strong(buffer);
1330                    }
1331                }
1332                OpenBuffer::Loading(_) => unreachable!(),
1333            }
1334        }
1335
1336        for worktree_handle in self.worktrees.iter_mut() {
1337            match worktree_handle {
1338                WorktreeHandle::Strong(_) => {}
1339                WorktreeHandle::Weak(worktree) => {
1340                    if let Some(worktree) = worktree.upgrade(cx) {
1341                        *worktree_handle = WorktreeHandle::Strong(worktree);
1342                    }
1343                }
1344            }
1345        }
1346
1347        let mut tasks = Vec::new();
1348        for worktree in self.worktrees(cx).collect::<Vec<_>>() {
1349            worktree.update(cx, |worktree, cx| {
1350                let worktree = worktree.as_local_mut().unwrap();
1351                tasks.push(worktree.share(project_id, cx));
1352            });
1353        }
1354
1355        for (server_id, status) in &self.language_server_statuses {
1356            self.client
1357                .send(proto::StartLanguageServer {
1358                    project_id,
1359                    server: Some(proto::LanguageServer {
1360                        id: *server_id as u64,
1361                        name: status.name.clone(),
1362                    }),
1363                })
1364                .log_err();
1365        }
1366
1367        cx.spawn(|this, mut cx| async move {
1368            for task in tasks {
1369                task.await?;
1370            }
1371            this.update(&mut cx, |_, cx| cx.notify());
1372            Ok(())
1373        })
1374    }
1375
1376    fn unshared(&mut self, cx: &mut ModelContext<Self>) {
1377        if let ProjectClientState::Local { is_shared, .. } = &mut self.client_state {
1378            if !*is_shared {
1379                return;
1380            }
1381
1382            *is_shared = false;
1383            self.collaborators.clear();
1384            self.shared_buffers.clear();
1385            for worktree_handle in self.worktrees.iter_mut() {
1386                if let WorktreeHandle::Strong(worktree) = worktree_handle {
1387                    let is_visible = worktree.update(cx, |worktree, _| {
1388                        worktree.as_local_mut().unwrap().unshare();
1389                        worktree.is_visible()
1390                    });
1391                    if !is_visible {
1392                        *worktree_handle = WorktreeHandle::Weak(worktree.downgrade());
1393                    }
1394                }
1395            }
1396
1397            for open_buffer in self.opened_buffers.values_mut() {
1398                match open_buffer {
1399                    OpenBuffer::Strong(buffer) => {
1400                        *open_buffer = OpenBuffer::Weak(buffer.downgrade());
1401                    }
1402                    _ => {}
1403                }
1404            }
1405
1406            cx.notify();
1407        } else {
1408            log::error!("attempted to unshare a remote project");
1409        }
1410    }
1411
1412    pub fn respond_to_join_request(
1413        &mut self,
1414        requester_id: u64,
1415        allow: bool,
1416        cx: &mut ModelContext<Self>,
1417    ) {
1418        if let Some(project_id) = self.remote_id() {
1419            let share = if self.is_online() && allow {
1420                Some(self.share(cx))
1421            } else {
1422                None
1423            };
1424            let client = self.client.clone();
1425            cx.foreground()
1426                .spawn(async move {
1427                    client.send(proto::RespondToJoinProjectRequest {
1428                        requester_id,
1429                        project_id,
1430                        allow,
1431                    })?;
1432                    if let Some(share) = share {
1433                        share.await?;
1434                    }
1435                    anyhow::Ok(())
1436                })
1437                .detach_and_log_err(cx);
1438        }
1439    }
1440
1441    fn removed_from_project(&mut self, cx: &mut ModelContext<Self>) {
1442        if let ProjectClientState::Remote {
1443            sharing_has_stopped,
1444            ..
1445        } = &mut self.client_state
1446        {
1447            *sharing_has_stopped = true;
1448            self.collaborators.clear();
1449            for worktree in &self.worktrees {
1450                if let Some(worktree) = worktree.upgrade(cx) {
1451                    worktree.update(cx, |worktree, _| {
1452                        if let Some(worktree) = worktree.as_remote_mut() {
1453                            worktree.disconnected_from_host();
1454                        }
1455                    });
1456                }
1457            }
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(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.clone()),
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.id_for_language.clone();
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                            .clone(),
1857                        )
1858                        .log_err();
1859                    buffer_handle.update(cx, |buffer, cx| {
1860                        buffer.set_completion_triggers(
1861                            server
1862                                .capabilities()
1863                                .completion_provider
1864                                .as_ref()
1865                                .and_then(|provider| provider.trigger_characters.clone())
1866                                .unwrap_or(Vec::new()),
1867                            cx,
1868                        )
1869                    });
1870                    self.buffer_snapshots
1871                        .insert(buffer_id, vec![(0, initial_snapshot)]);
1872                }
1873            }
1874        }
1875    }
1876
1877    fn unregister_buffer_from_language_server(
1878        &mut self,
1879        buffer: &ModelHandle<Buffer>,
1880        old_path: PathBuf,
1881        cx: &mut ModelContext<Self>,
1882    ) {
1883        buffer.update(cx, |buffer, cx| {
1884            buffer.update_diagnostics(Default::default(), cx);
1885            self.buffer_snapshots.remove(&buffer.remote_id());
1886            if let Some((_, language_server)) = self.language_server_for_buffer(buffer, cx) {
1887                language_server
1888                    .notify::<lsp::notification::DidCloseTextDocument>(
1889                        lsp::DidCloseTextDocumentParams {
1890                            text_document: lsp::TextDocumentIdentifier::new(
1891                                lsp::Url::from_file_path(old_path).unwrap(),
1892                            ),
1893                        },
1894                    )
1895                    .log_err();
1896            }
1897        });
1898    }
1899
1900    fn on_buffer_event(
1901        &mut self,
1902        buffer: ModelHandle<Buffer>,
1903        event: &BufferEvent,
1904        cx: &mut ModelContext<'_, Self>,
1905    ) -> Option<()> {
1906        match event {
1907            BufferEvent::Operation(operation) => {
1908                if let Some(project_id) = self.shared_remote_id() {
1909                    let request = self.client.request(proto::UpdateBuffer {
1910                        project_id,
1911                        buffer_id: buffer.read(cx).remote_id(),
1912                        operations: vec![language::proto::serialize_operation(&operation)],
1913                    });
1914                    cx.background().spawn(request).detach_and_log_err(cx);
1915                } else if let Some(project_id) = self.remote_id() {
1916                    let _ = self
1917                        .client
1918                        .send(proto::RegisterProjectActivity { project_id });
1919                }
1920            }
1921            BufferEvent::Edited { .. } => {
1922                let language_server = self
1923                    .language_server_for_buffer(buffer.read(cx), cx)
1924                    .map(|(_, server)| server.clone())?;
1925                let buffer = buffer.read(cx);
1926                let file = File::from_dyn(buffer.file())?;
1927                let abs_path = file.as_local()?.abs_path(cx);
1928                let uri = lsp::Url::from_file_path(abs_path).unwrap();
1929                let buffer_snapshots = self.buffer_snapshots.get_mut(&buffer.remote_id())?;
1930                let (version, prev_snapshot) = buffer_snapshots.last()?;
1931                let next_snapshot = buffer.text_snapshot();
1932                let next_version = version + 1;
1933
1934                let content_changes = buffer
1935                    .edits_since::<(PointUtf16, usize)>(prev_snapshot.version())
1936                    .map(|edit| {
1937                        let edit_start = edit.new.start.0;
1938                        let edit_end = edit_start + (edit.old.end.0 - edit.old.start.0);
1939                        let new_text = next_snapshot
1940                            .text_for_range(edit.new.start.1..edit.new.end.1)
1941                            .collect();
1942                        lsp::TextDocumentContentChangeEvent {
1943                            range: Some(lsp::Range::new(
1944                                point_to_lsp(edit_start),
1945                                point_to_lsp(edit_end),
1946                            )),
1947                            range_length: None,
1948                            text: new_text,
1949                        }
1950                    })
1951                    .collect();
1952
1953                buffer_snapshots.push((next_version, next_snapshot));
1954
1955                language_server
1956                    .notify::<lsp::notification::DidChangeTextDocument>(
1957                        lsp::DidChangeTextDocumentParams {
1958                            text_document: lsp::VersionedTextDocumentIdentifier::new(
1959                                uri,
1960                                next_version,
1961                            ),
1962                            content_changes,
1963                        },
1964                    )
1965                    .log_err();
1966            }
1967            BufferEvent::Saved => {
1968                let file = File::from_dyn(buffer.read(cx).file())?;
1969                let worktree_id = file.worktree_id(cx);
1970                let abs_path = file.as_local()?.abs_path(cx);
1971                let text_document = lsp::TextDocumentIdentifier {
1972                    uri: lsp::Url::from_file_path(abs_path).unwrap(),
1973                };
1974
1975                for (_, server) in self.language_servers_for_worktree(worktree_id) {
1976                    server
1977                        .notify::<lsp::notification::DidSaveTextDocument>(
1978                            lsp::DidSaveTextDocumentParams {
1979                                text_document: text_document.clone(),
1980                                text: None,
1981                            },
1982                        )
1983                        .log_err();
1984                }
1985
1986                // After saving a buffer, simulate disk-based diagnostics being finished for languages
1987                // that don't support a disk-based progress token.
1988                let (lsp_adapter, language_server) =
1989                    self.language_server_for_buffer(buffer.read(cx), cx)?;
1990                if lsp_adapter.disk_based_diagnostics_progress_token.is_none() {
1991                    let server_id = language_server.server_id();
1992                    self.disk_based_diagnostics_finished(server_id, cx);
1993                    self.broadcast_language_server_update(
1994                        server_id,
1995                        proto::update_language_server::Variant::DiskBasedDiagnosticsUpdated(
1996                            proto::LspDiskBasedDiagnosticsUpdated {},
1997                        ),
1998                    );
1999                }
2000            }
2001            _ => {}
2002        }
2003
2004        None
2005    }
2006
2007    fn language_servers_for_worktree(
2008        &self,
2009        worktree_id: WorktreeId,
2010    ) -> impl Iterator<Item = (&Arc<LspAdapter>, &Arc<LanguageServer>)> {
2011        self.language_server_ids
2012            .iter()
2013            .filter_map(move |((language_server_worktree_id, _), id)| {
2014                if *language_server_worktree_id == worktree_id {
2015                    if let Some(LanguageServerState::Running { adapter, server }) =
2016                        self.language_servers.get(&id)
2017                    {
2018                        return Some((adapter, server));
2019                    }
2020                }
2021                None
2022            })
2023    }
2024
2025    fn maintain_buffer_languages(
2026        languages: &LanguageRegistry,
2027        cx: &mut ModelContext<Project>,
2028    ) -> Task<()> {
2029        let mut subscription = languages.subscribe();
2030        cx.spawn_weak(|project, mut cx| async move {
2031            while let Some(()) = subscription.next().await {
2032                if let Some(project) = project.upgrade(&cx) {
2033                    project.update(&mut cx, |project, cx| {
2034                        let mut buffers_without_language = Vec::new();
2035                        for buffer in project.opened_buffers.values() {
2036                            if let Some(buffer) = buffer.upgrade(cx) {
2037                                if buffer.read(cx).language().is_none() {
2038                                    buffers_without_language.push(buffer);
2039                                }
2040                            }
2041                        }
2042
2043                        for buffer in buffers_without_language {
2044                            project.assign_language_to_buffer(&buffer, cx);
2045                            project.register_buffer_with_language_server(&buffer, cx);
2046                            dbg!(buffer.read(cx).language().map(|x| x.name()));
2047                        }
2048                    });
2049                }
2050            }
2051        })
2052    }
2053
2054    fn assign_language_to_buffer(
2055        &mut self,
2056        buffer: &ModelHandle<Buffer>,
2057        cx: &mut ModelContext<Self>,
2058    ) -> Option<()> {
2059        // If the buffer has a language, set it and start the language server if we haven't already.
2060        let full_path = buffer.read(cx).file()?.full_path(cx);
2061        let language = self.languages.select_language(&full_path)?;
2062        buffer.update(cx, |buffer, cx| {
2063            buffer.set_language(Some(language.clone()), cx);
2064        });
2065
2066        let file = File::from_dyn(buffer.read(cx).file())?;
2067        let worktree = file.worktree.read(cx).as_local()?;
2068        let worktree_id = worktree.id();
2069        let worktree_abs_path = worktree.abs_path().clone();
2070        self.start_language_server(worktree_id, worktree_abs_path, language, cx);
2071
2072        None
2073    }
2074
2075    fn start_language_server(
2076        &mut self,
2077        worktree_id: WorktreeId,
2078        worktree_path: Arc<Path>,
2079        language: Arc<Language>,
2080        cx: &mut ModelContext<Self>,
2081    ) {
2082        if !cx
2083            .global::<Settings>()
2084            .enable_language_server(Some(&language.name()))
2085        {
2086            return;
2087        }
2088
2089        let adapter = if let Some(adapter) = language.lsp_adapter() {
2090            adapter
2091        } else {
2092            return;
2093        };
2094        let key = (worktree_id, adapter.name.clone());
2095
2096        self.language_server_ids
2097            .entry(key.clone())
2098            .or_insert_with(|| {
2099                let server_id = post_inc(&mut self.next_language_server_id);
2100                let language_server = self.languages.start_language_server(
2101                    server_id,
2102                    language.clone(),
2103                    worktree_path,
2104                    self.client.http_client(),
2105                    cx,
2106                );
2107                self.language_servers.insert(
2108                    server_id,
2109                    LanguageServerState::Starting(cx.spawn_weak(|this, mut cx| async move {
2110                        let language_server = language_server?.await.log_err()?;
2111                        let language_server = language_server
2112                            .initialize(adapter.initialization_options.clone())
2113                            .await
2114                            .log_err()?;
2115                        let this = this.upgrade(&cx)?;
2116
2117                        language_server
2118                            .on_notification::<lsp::notification::PublishDiagnostics, _>({
2119                                let this = this.downgrade();
2120                                let adapter = adapter.clone();
2121                                move |mut params, cx| {
2122                                    let this = this.clone();
2123                                    let adapter = adapter.clone();
2124                                    cx.spawn(|mut cx| async move {
2125                                        adapter.process_diagnostics(&mut params).await;
2126                                        if let Some(this) = this.upgrade(&cx) {
2127                                            this.update(&mut cx, |this, cx| {
2128                                                this.update_diagnostics(
2129                                                    server_id,
2130                                                    params,
2131                                                    &adapter.disk_based_diagnostic_sources,
2132                                                    cx,
2133                                                )
2134                                                .log_err();
2135                                            });
2136                                        }
2137                                    })
2138                                    .detach();
2139                                }
2140                            })
2141                            .detach();
2142
2143                        language_server
2144                            .on_request::<lsp::request::WorkspaceConfiguration, _, _>({
2145                                let settings = this.read_with(&cx, |this, _| {
2146                                    this.language_server_settings.clone()
2147                                });
2148                                move |params, _| {
2149                                    let settings = settings.lock().clone();
2150                                    async move {
2151                                        Ok(params
2152                                            .items
2153                                            .into_iter()
2154                                            .map(|item| {
2155                                                if let Some(section) = &item.section {
2156                                                    settings
2157                                                        .get(section)
2158                                                        .cloned()
2159                                                        .unwrap_or(serde_json::Value::Null)
2160                                                } else {
2161                                                    settings.clone()
2162                                                }
2163                                            })
2164                                            .collect())
2165                                    }
2166                                }
2167                            })
2168                            .detach();
2169
2170                        // Even though we don't have handling for these requests, respond to them to
2171                        // avoid stalling any language server like `gopls` which waits for a response
2172                        // to these requests when initializing.
2173                        language_server
2174                            .on_request::<lsp::request::WorkDoneProgressCreate, _, _>({
2175                                let this = this.downgrade();
2176                                move |params, mut cx| async move {
2177                                    if let Some(this) = this.upgrade(&cx) {
2178                                        this.update(&mut cx, |this, _| {
2179                                            if let Some(status) =
2180                                                this.language_server_statuses.get_mut(&server_id)
2181                                            {
2182                                                if let lsp::NumberOrString::String(token) =
2183                                                    params.token
2184                                                {
2185                                                    status.progress_tokens.insert(token);
2186                                                }
2187                                            }
2188                                        });
2189                                    }
2190                                    Ok(())
2191                                }
2192                            })
2193                            .detach();
2194                        language_server
2195                            .on_request::<lsp::request::RegisterCapability, _, _>(|_, _| async {
2196                                Ok(())
2197                            })
2198                            .detach();
2199
2200                        language_server
2201                            .on_request::<lsp::request::ApplyWorkspaceEdit, _, _>({
2202                                let this = this.downgrade();
2203                                let adapter = adapter.clone();
2204                                let language_server = language_server.clone();
2205                                move |params, cx| {
2206                                    Self::on_lsp_workspace_edit(
2207                                        this,
2208                                        params,
2209                                        server_id,
2210                                        adapter.clone(),
2211                                        language_server.clone(),
2212                                        cx,
2213                                    )
2214                                }
2215                            })
2216                            .detach();
2217
2218                        let disk_based_diagnostics_progress_token =
2219                            adapter.disk_based_diagnostics_progress_token.clone();
2220
2221                        language_server
2222                            .on_notification::<lsp::notification::Progress, _>({
2223                                let this = this.downgrade();
2224                                move |params, mut cx| {
2225                                    if let Some(this) = this.upgrade(&cx) {
2226                                        this.update(&mut cx, |this, cx| {
2227                                            this.on_lsp_progress(
2228                                                params,
2229                                                server_id,
2230                                                disk_based_diagnostics_progress_token.clone(),
2231                                                cx,
2232                                            );
2233                                        });
2234                                    }
2235                                }
2236                            })
2237                            .detach();
2238
2239                        this.update(&mut cx, |this, cx| {
2240                            // If the language server for this key doesn't match the server id, don't store the
2241                            // server. Which will cause it to be dropped, killing the process
2242                            if this
2243                                .language_server_ids
2244                                .get(&key)
2245                                .map(|id| id != &server_id)
2246                                .unwrap_or(false)
2247                            {
2248                                return None;
2249                            }
2250
2251                            // Update language_servers collection with Running variant of LanguageServerState
2252                            // indicating that the server is up and running and ready
2253                            this.language_servers.insert(
2254                                server_id,
2255                                LanguageServerState::Running {
2256                                    adapter: adapter.clone(),
2257                                    server: language_server.clone(),
2258                                },
2259                            );
2260                            this.language_server_statuses.insert(
2261                                server_id,
2262                                LanguageServerStatus {
2263                                    name: language_server.name().to_string(),
2264                                    pending_work: Default::default(),
2265                                    has_pending_diagnostic_updates: false,
2266                                    progress_tokens: Default::default(),
2267                                },
2268                            );
2269                            language_server
2270                                .notify::<lsp::notification::DidChangeConfiguration>(
2271                                    lsp::DidChangeConfigurationParams {
2272                                        settings: this.language_server_settings.lock().clone(),
2273                                    },
2274                                )
2275                                .ok();
2276
2277                            if let Some(project_id) = this.shared_remote_id() {
2278                                this.client
2279                                    .send(proto::StartLanguageServer {
2280                                        project_id,
2281                                        server: Some(proto::LanguageServer {
2282                                            id: server_id as u64,
2283                                            name: language_server.name().to_string(),
2284                                        }),
2285                                    })
2286                                    .log_err();
2287                            }
2288
2289                            // Tell the language server about every open buffer in the worktree that matches the language.
2290                            for buffer in this.opened_buffers.values() {
2291                                if let Some(buffer_handle) = buffer.upgrade(cx) {
2292                                    let buffer = buffer_handle.read(cx);
2293                                    let file = if let Some(file) = File::from_dyn(buffer.file()) {
2294                                        file
2295                                    } else {
2296                                        continue;
2297                                    };
2298                                    let language = if let Some(language) = buffer.language() {
2299                                        language
2300                                    } else {
2301                                        continue;
2302                                    };
2303                                    if file.worktree.read(cx).id() != key.0
2304                                        || language.lsp_adapter().map(|a| a.name.clone())
2305                                            != Some(key.1.clone())
2306                                    {
2307                                        continue;
2308                                    }
2309
2310                                    let file = file.as_local()?;
2311                                    let versions = this
2312                                        .buffer_snapshots
2313                                        .entry(buffer.remote_id())
2314                                        .or_insert_with(|| vec![(0, buffer.text_snapshot())]);
2315                                    let (version, initial_snapshot) = versions.last().unwrap();
2316                                    let uri = lsp::Url::from_file_path(file.abs_path(cx)).unwrap();
2317                                    language_server
2318                                        .notify::<lsp::notification::DidOpenTextDocument>(
2319                                            lsp::DidOpenTextDocumentParams {
2320                                                text_document: lsp::TextDocumentItem::new(
2321                                                    uri,
2322                                                    adapter
2323                                                        .id_for_language
2324                                                        .clone()
2325                                                        .unwrap_or_default(),
2326                                                    *version,
2327                                                    initial_snapshot.text(),
2328                                                ),
2329                                            },
2330                                        )
2331                                        .log_err()?;
2332                                    buffer_handle.update(cx, |buffer, cx| {
2333                                        buffer.set_completion_triggers(
2334                                            language_server
2335                                                .capabilities()
2336                                                .completion_provider
2337                                                .as_ref()
2338                                                .and_then(|provider| {
2339                                                    provider.trigger_characters.clone()
2340                                                })
2341                                                .unwrap_or(Vec::new()),
2342                                            cx,
2343                                        )
2344                                    });
2345                                }
2346                            }
2347
2348                            cx.notify();
2349                            Some(language_server)
2350                        })
2351                    })),
2352                );
2353
2354                server_id
2355            });
2356    }
2357
2358    // Returns a list of all of the worktrees which no longer have a language server and the root path
2359    // for the stopped server
2360    fn stop_language_server(
2361        &mut self,
2362        worktree_id: WorktreeId,
2363        adapter_name: LanguageServerName,
2364        cx: &mut ModelContext<Self>,
2365    ) -> Task<(Option<PathBuf>, Vec<WorktreeId>)> {
2366        let key = (worktree_id, adapter_name);
2367        if let Some(server_id) = self.language_server_ids.remove(&key) {
2368            // Remove other entries for this language server as well
2369            let mut orphaned_worktrees = vec![worktree_id];
2370            let other_keys = self.language_server_ids.keys().cloned().collect::<Vec<_>>();
2371            for other_key in other_keys {
2372                if self.language_server_ids.get(&other_key) == Some(&server_id) {
2373                    self.language_server_ids.remove(&other_key);
2374                    orphaned_worktrees.push(other_key.0);
2375                }
2376            }
2377
2378            self.language_server_statuses.remove(&server_id);
2379            cx.notify();
2380
2381            let server_state = self.language_servers.remove(&server_id);
2382            cx.spawn_weak(|this, mut cx| async move {
2383                let mut root_path = None;
2384
2385                let server = match server_state {
2386                    Some(LanguageServerState::Starting(started_language_server)) => {
2387                        started_language_server.await
2388                    }
2389                    Some(LanguageServerState::Running { server, .. }) => Some(server),
2390                    None => None,
2391                };
2392
2393                if let Some(server) = server {
2394                    root_path = Some(server.root_path().clone());
2395                    if let Some(shutdown) = server.shutdown() {
2396                        shutdown.await;
2397                    }
2398                }
2399
2400                if let Some(this) = this.upgrade(&cx) {
2401                    this.update(&mut cx, |this, cx| {
2402                        this.language_server_statuses.remove(&server_id);
2403                        cx.notify();
2404                    });
2405                }
2406
2407                (root_path, orphaned_worktrees)
2408            })
2409        } else {
2410            Task::ready((None, Vec::new()))
2411        }
2412    }
2413
2414    pub fn restart_language_servers_for_buffers(
2415        &mut self,
2416        buffers: impl IntoIterator<Item = ModelHandle<Buffer>>,
2417        cx: &mut ModelContext<Self>,
2418    ) -> Option<()> {
2419        let language_server_lookup_info: HashSet<(WorktreeId, Arc<Path>, PathBuf)> = buffers
2420            .into_iter()
2421            .filter_map(|buffer| {
2422                let file = File::from_dyn(buffer.read(cx).file())?;
2423                let worktree = file.worktree.read(cx).as_local()?;
2424                let worktree_id = worktree.id();
2425                let worktree_abs_path = worktree.abs_path().clone();
2426                let full_path = file.full_path(cx);
2427                Some((worktree_id, worktree_abs_path, full_path))
2428            })
2429            .collect();
2430        for (worktree_id, worktree_abs_path, full_path) in language_server_lookup_info {
2431            let language = self.languages.select_language(&full_path)?;
2432            self.restart_language_server(worktree_id, worktree_abs_path, language, cx);
2433        }
2434
2435        None
2436    }
2437
2438    fn restart_language_server(
2439        &mut self,
2440        worktree_id: WorktreeId,
2441        fallback_path: Arc<Path>,
2442        language: Arc<Language>,
2443        cx: &mut ModelContext<Self>,
2444    ) {
2445        let adapter = if let Some(adapter) = language.lsp_adapter() {
2446            adapter
2447        } else {
2448            return;
2449        };
2450
2451        let server_name = adapter.name.clone();
2452        let stop = self.stop_language_server(worktree_id, server_name.clone(), cx);
2453        cx.spawn_weak(|this, mut cx| async move {
2454            let (original_root_path, orphaned_worktrees) = stop.await;
2455            if let Some(this) = this.upgrade(&cx) {
2456                this.update(&mut cx, |this, cx| {
2457                    // Attempt to restart using original server path. Fallback to passed in
2458                    // path if we could not retrieve the root path
2459                    let root_path = original_root_path
2460                        .map(|path_buf| Arc::from(path_buf.as_path()))
2461                        .unwrap_or(fallback_path);
2462
2463                    this.start_language_server(worktree_id, root_path, language, cx);
2464
2465                    // Lookup new server id and set it for each of the orphaned worktrees
2466                    if let Some(new_server_id) = this
2467                        .language_server_ids
2468                        .get(&(worktree_id, server_name.clone()))
2469                        .cloned()
2470                    {
2471                        for orphaned_worktree in orphaned_worktrees {
2472                            this.language_server_ids.insert(
2473                                (orphaned_worktree, server_name.clone()),
2474                                new_server_id.clone(),
2475                            );
2476                        }
2477                    }
2478                });
2479            }
2480        })
2481        .detach();
2482    }
2483
2484    fn on_lsp_progress(
2485        &mut self,
2486        progress: lsp::ProgressParams,
2487        server_id: usize,
2488        disk_based_diagnostics_progress_token: Option<String>,
2489        cx: &mut ModelContext<Self>,
2490    ) {
2491        let token = match progress.token {
2492            lsp::NumberOrString::String(token) => token,
2493            lsp::NumberOrString::Number(token) => {
2494                log::info!("skipping numeric progress token {}", token);
2495                return;
2496            }
2497        };
2498        let progress = match progress.value {
2499            lsp::ProgressParamsValue::WorkDone(value) => value,
2500        };
2501        let language_server_status =
2502            if let Some(status) = self.language_server_statuses.get_mut(&server_id) {
2503                status
2504            } else {
2505                return;
2506            };
2507
2508        if !language_server_status.progress_tokens.contains(&token) {
2509            return;
2510        }
2511
2512        let same_token =
2513            Some(token.as_ref()) == disk_based_diagnostics_progress_token.as_ref().map(|x| &**x);
2514
2515        match progress {
2516            lsp::WorkDoneProgress::Begin(report) => {
2517                if same_token {
2518                    language_server_status.has_pending_diagnostic_updates = true;
2519                    self.disk_based_diagnostics_started(server_id, cx);
2520                    self.broadcast_language_server_update(
2521                        server_id,
2522                        proto::update_language_server::Variant::DiskBasedDiagnosticsUpdating(
2523                            proto::LspDiskBasedDiagnosticsUpdating {},
2524                        ),
2525                    );
2526                } else {
2527                    self.on_lsp_work_start(
2528                        server_id,
2529                        token.clone(),
2530                        LanguageServerProgress {
2531                            message: report.message.clone(),
2532                            percentage: report.percentage.map(|p| p as usize),
2533                            last_update_at: Instant::now(),
2534                        },
2535                        cx,
2536                    );
2537                    self.broadcast_language_server_update(
2538                        server_id,
2539                        proto::update_language_server::Variant::WorkStart(proto::LspWorkStart {
2540                            token,
2541                            message: report.message,
2542                            percentage: report.percentage.map(|p| p as u32),
2543                        }),
2544                    );
2545                }
2546            }
2547            lsp::WorkDoneProgress::Report(report) => {
2548                if !same_token {
2549                    self.on_lsp_work_progress(
2550                        server_id,
2551                        token.clone(),
2552                        LanguageServerProgress {
2553                            message: report.message.clone(),
2554                            percentage: report.percentage.map(|p| p as usize),
2555                            last_update_at: Instant::now(),
2556                        },
2557                        cx,
2558                    );
2559                    self.broadcast_language_server_update(
2560                        server_id,
2561                        proto::update_language_server::Variant::WorkProgress(
2562                            proto::LspWorkProgress {
2563                                token,
2564                                message: report.message,
2565                                percentage: report.percentage.map(|p| p as u32),
2566                            },
2567                        ),
2568                    );
2569                }
2570            }
2571            lsp::WorkDoneProgress::End(_) => {
2572                language_server_status.progress_tokens.remove(&token);
2573
2574                if same_token {
2575                    language_server_status.has_pending_diagnostic_updates = false;
2576                    self.disk_based_diagnostics_finished(server_id, cx);
2577                    self.broadcast_language_server_update(
2578                        server_id,
2579                        proto::update_language_server::Variant::DiskBasedDiagnosticsUpdated(
2580                            proto::LspDiskBasedDiagnosticsUpdated {},
2581                        ),
2582                    );
2583                } else {
2584                    self.on_lsp_work_end(server_id, token.clone(), cx);
2585                    self.broadcast_language_server_update(
2586                        server_id,
2587                        proto::update_language_server::Variant::WorkEnd(proto::LspWorkEnd {
2588                            token,
2589                        }),
2590                    );
2591                }
2592            }
2593        }
2594    }
2595
2596    fn on_lsp_work_start(
2597        &mut self,
2598        language_server_id: usize,
2599        token: String,
2600        progress: LanguageServerProgress,
2601        cx: &mut ModelContext<Self>,
2602    ) {
2603        if let Some(status) = self.language_server_statuses.get_mut(&language_server_id) {
2604            status.pending_work.insert(token, progress);
2605            cx.notify();
2606        }
2607    }
2608
2609    fn on_lsp_work_progress(
2610        &mut self,
2611        language_server_id: usize,
2612        token: String,
2613        progress: LanguageServerProgress,
2614        cx: &mut ModelContext<Self>,
2615    ) {
2616        if let Some(status) = self.language_server_statuses.get_mut(&language_server_id) {
2617            let entry = status
2618                .pending_work
2619                .entry(token)
2620                .or_insert(LanguageServerProgress {
2621                    message: Default::default(),
2622                    percentage: Default::default(),
2623                    last_update_at: progress.last_update_at,
2624                });
2625            if progress.message.is_some() {
2626                entry.message = progress.message;
2627            }
2628            if progress.percentage.is_some() {
2629                entry.percentage = progress.percentage;
2630            }
2631            entry.last_update_at = progress.last_update_at;
2632            cx.notify();
2633        }
2634    }
2635
2636    fn on_lsp_work_end(
2637        &mut self,
2638        language_server_id: usize,
2639        token: String,
2640        cx: &mut ModelContext<Self>,
2641    ) {
2642        if let Some(status) = self.language_server_statuses.get_mut(&language_server_id) {
2643            status.pending_work.remove(&token);
2644            cx.notify();
2645        }
2646    }
2647
2648    async fn on_lsp_workspace_edit(
2649        this: WeakModelHandle<Self>,
2650        params: lsp::ApplyWorkspaceEditParams,
2651        server_id: usize,
2652        adapter: Arc<LspAdapter>,
2653        language_server: Arc<LanguageServer>,
2654        mut cx: AsyncAppContext,
2655    ) -> Result<lsp::ApplyWorkspaceEditResponse> {
2656        let this = this
2657            .upgrade(&cx)
2658            .ok_or_else(|| anyhow!("project project closed"))?;
2659        let transaction = Self::deserialize_workspace_edit(
2660            this.clone(),
2661            params.edit,
2662            true,
2663            adapter.clone(),
2664            language_server.clone(),
2665            &mut cx,
2666        )
2667        .await
2668        .log_err();
2669        this.update(&mut cx, |this, _| {
2670            if let Some(transaction) = transaction {
2671                this.last_workspace_edits_by_language_server
2672                    .insert(server_id, transaction);
2673            }
2674        });
2675        Ok(lsp::ApplyWorkspaceEditResponse {
2676            applied: true,
2677            failed_change: None,
2678            failure_reason: None,
2679        })
2680    }
2681
2682    fn broadcast_language_server_update(
2683        &self,
2684        language_server_id: usize,
2685        event: proto::update_language_server::Variant,
2686    ) {
2687        if let Some(project_id) = self.shared_remote_id() {
2688            self.client
2689                .send(proto::UpdateLanguageServer {
2690                    project_id,
2691                    language_server_id: language_server_id as u64,
2692                    variant: Some(event),
2693                })
2694                .log_err();
2695        }
2696    }
2697
2698    pub fn set_language_server_settings(&mut self, settings: serde_json::Value) {
2699        for server_state in self.language_servers.values() {
2700            if let LanguageServerState::Running { server, .. } = server_state {
2701                server
2702                    .notify::<lsp::notification::DidChangeConfiguration>(
2703                        lsp::DidChangeConfigurationParams {
2704                            settings: settings.clone(),
2705                        },
2706                    )
2707                    .ok();
2708            }
2709        }
2710        *self.language_server_settings.lock() = settings;
2711    }
2712
2713    pub fn language_server_statuses(
2714        &self,
2715    ) -> impl DoubleEndedIterator<Item = &LanguageServerStatus> {
2716        self.language_server_statuses.values()
2717    }
2718
2719    pub fn update_diagnostics(
2720        &mut self,
2721        language_server_id: usize,
2722        params: lsp::PublishDiagnosticsParams,
2723        disk_based_sources: &[String],
2724        cx: &mut ModelContext<Self>,
2725    ) -> Result<()> {
2726        let abs_path = params
2727            .uri
2728            .to_file_path()
2729            .map_err(|_| anyhow!("URI is not a file"))?;
2730        let mut diagnostics = Vec::default();
2731        let mut primary_diagnostic_group_ids = HashMap::default();
2732        let mut sources_by_group_id = HashMap::default();
2733        let mut supporting_diagnostics = HashMap::default();
2734        for diagnostic in &params.diagnostics {
2735            let source = diagnostic.source.as_ref();
2736            let code = diagnostic.code.as_ref().map(|code| match code {
2737                lsp::NumberOrString::Number(code) => code.to_string(),
2738                lsp::NumberOrString::String(code) => code.clone(),
2739            });
2740            let range = range_from_lsp(diagnostic.range);
2741            let is_supporting = diagnostic
2742                .related_information
2743                .as_ref()
2744                .map_or(false, |infos| {
2745                    infos.iter().any(|info| {
2746                        primary_diagnostic_group_ids.contains_key(&(
2747                            source,
2748                            code.clone(),
2749                            range_from_lsp(info.location.range),
2750                        ))
2751                    })
2752                });
2753
2754            let is_unnecessary = diagnostic.tags.as_ref().map_or(false, |tags| {
2755                tags.iter().any(|tag| *tag == DiagnosticTag::UNNECESSARY)
2756            });
2757
2758            if is_supporting {
2759                supporting_diagnostics.insert(
2760                    (source, code.clone(), range),
2761                    (diagnostic.severity, is_unnecessary),
2762                );
2763            } else {
2764                let group_id = post_inc(&mut self.next_diagnostic_group_id);
2765                let is_disk_based =
2766                    source.map_or(false, |source| disk_based_sources.contains(&source));
2767
2768                sources_by_group_id.insert(group_id, source);
2769                primary_diagnostic_group_ids
2770                    .insert((source, code.clone(), range.clone()), group_id);
2771
2772                diagnostics.push(DiagnosticEntry {
2773                    range,
2774                    diagnostic: Diagnostic {
2775                        code: code.clone(),
2776                        severity: diagnostic.severity.unwrap_or(DiagnosticSeverity::ERROR),
2777                        message: diagnostic.message.clone(),
2778                        group_id,
2779                        is_primary: true,
2780                        is_valid: true,
2781                        is_disk_based,
2782                        is_unnecessary,
2783                    },
2784                });
2785                if let Some(infos) = &diagnostic.related_information {
2786                    for info in infos {
2787                        if info.location.uri == params.uri && !info.message.is_empty() {
2788                            let range = range_from_lsp(info.location.range);
2789                            diagnostics.push(DiagnosticEntry {
2790                                range,
2791                                diagnostic: Diagnostic {
2792                                    code: code.clone(),
2793                                    severity: DiagnosticSeverity::INFORMATION,
2794                                    message: info.message.clone(),
2795                                    group_id,
2796                                    is_primary: false,
2797                                    is_valid: true,
2798                                    is_disk_based,
2799                                    is_unnecessary: false,
2800                                },
2801                            });
2802                        }
2803                    }
2804                }
2805            }
2806        }
2807
2808        for entry in &mut diagnostics {
2809            let diagnostic = &mut entry.diagnostic;
2810            if !diagnostic.is_primary {
2811                let source = *sources_by_group_id.get(&diagnostic.group_id).unwrap();
2812                if let Some(&(severity, is_unnecessary)) = supporting_diagnostics.get(&(
2813                    source,
2814                    diagnostic.code.clone(),
2815                    entry.range.clone(),
2816                )) {
2817                    if let Some(severity) = severity {
2818                        diagnostic.severity = severity;
2819                    }
2820                    diagnostic.is_unnecessary = is_unnecessary;
2821                }
2822            }
2823        }
2824
2825        self.update_diagnostic_entries(
2826            language_server_id,
2827            abs_path,
2828            params.version,
2829            diagnostics,
2830            cx,
2831        )?;
2832        Ok(())
2833    }
2834
2835    pub fn update_diagnostic_entries(
2836        &mut self,
2837        language_server_id: usize,
2838        abs_path: PathBuf,
2839        version: Option<i32>,
2840        diagnostics: Vec<DiagnosticEntry<PointUtf16>>,
2841        cx: &mut ModelContext<Project>,
2842    ) -> Result<(), anyhow::Error> {
2843        let (worktree, relative_path) = self
2844            .find_local_worktree(&abs_path, cx)
2845            .ok_or_else(|| anyhow!("no worktree found for diagnostics"))?;
2846
2847        let project_path = ProjectPath {
2848            worktree_id: worktree.read(cx).id(),
2849            path: relative_path.into(),
2850        };
2851        if let Some(buffer) = self.get_open_buffer(&project_path, cx) {
2852            self.update_buffer_diagnostics(&buffer, diagnostics.clone(), version, cx)?;
2853        }
2854
2855        let updated = worktree.update(cx, |worktree, cx| {
2856            worktree
2857                .as_local_mut()
2858                .ok_or_else(|| anyhow!("not a local worktree"))?
2859                .update_diagnostics(
2860                    language_server_id,
2861                    project_path.path.clone(),
2862                    diagnostics,
2863                    cx,
2864                )
2865        })?;
2866        if updated {
2867            cx.emit(Event::DiagnosticsUpdated {
2868                language_server_id,
2869                path: project_path,
2870            });
2871        }
2872        Ok(())
2873    }
2874
2875    fn update_buffer_diagnostics(
2876        &mut self,
2877        buffer: &ModelHandle<Buffer>,
2878        mut diagnostics: Vec<DiagnosticEntry<PointUtf16>>,
2879        version: Option<i32>,
2880        cx: &mut ModelContext<Self>,
2881    ) -> Result<()> {
2882        fn compare_diagnostics(a: &Diagnostic, b: &Diagnostic) -> Ordering {
2883            Ordering::Equal
2884                .then_with(|| b.is_primary.cmp(&a.is_primary))
2885                .then_with(|| a.is_disk_based.cmp(&b.is_disk_based))
2886                .then_with(|| a.severity.cmp(&b.severity))
2887                .then_with(|| a.message.cmp(&b.message))
2888        }
2889
2890        let snapshot = self.buffer_snapshot_for_lsp_version(buffer, version, cx)?;
2891
2892        diagnostics.sort_unstable_by(|a, b| {
2893            Ordering::Equal
2894                .then_with(|| a.range.start.cmp(&b.range.start))
2895                .then_with(|| b.range.end.cmp(&a.range.end))
2896                .then_with(|| compare_diagnostics(&a.diagnostic, &b.diagnostic))
2897        });
2898
2899        let mut sanitized_diagnostics = Vec::new();
2900        let edits_since_save = Patch::new(
2901            snapshot
2902                .edits_since::<PointUtf16>(buffer.read(cx).saved_version())
2903                .collect(),
2904        );
2905        for entry in diagnostics {
2906            let start;
2907            let end;
2908            if entry.diagnostic.is_disk_based {
2909                // Some diagnostics are based on files on disk instead of buffers'
2910                // current contents. Adjust these diagnostics' ranges to reflect
2911                // any unsaved edits.
2912                start = edits_since_save.old_to_new(entry.range.start);
2913                end = edits_since_save.old_to_new(entry.range.end);
2914            } else {
2915                start = entry.range.start;
2916                end = entry.range.end;
2917            }
2918
2919            let mut range = snapshot.clip_point_utf16(start, Bias::Left)
2920                ..snapshot.clip_point_utf16(end, Bias::Right);
2921
2922            // Expand empty ranges by one character
2923            if range.start == range.end {
2924                range.end.column += 1;
2925                range.end = snapshot.clip_point_utf16(range.end, Bias::Right);
2926                if range.start == range.end && range.end.column > 0 {
2927                    range.start.column -= 1;
2928                    range.start = snapshot.clip_point_utf16(range.start, Bias::Left);
2929                }
2930            }
2931
2932            sanitized_diagnostics.push(DiagnosticEntry {
2933                range,
2934                diagnostic: entry.diagnostic,
2935            });
2936        }
2937        drop(edits_since_save);
2938
2939        let set = DiagnosticSet::new(sanitized_diagnostics, &snapshot);
2940        buffer.update(cx, |buffer, cx| buffer.update_diagnostics(set, cx));
2941        Ok(())
2942    }
2943
2944    pub fn reload_buffers(
2945        &self,
2946        buffers: HashSet<ModelHandle<Buffer>>,
2947        push_to_history: bool,
2948        cx: &mut ModelContext<Self>,
2949    ) -> Task<Result<ProjectTransaction>> {
2950        let mut local_buffers = Vec::new();
2951        let mut remote_buffers = None;
2952        for buffer_handle in buffers {
2953            let buffer = buffer_handle.read(cx);
2954            if buffer.is_dirty() {
2955                if let Some(file) = File::from_dyn(buffer.file()) {
2956                    if file.is_local() {
2957                        local_buffers.push(buffer_handle);
2958                    } else {
2959                        remote_buffers.get_or_insert(Vec::new()).push(buffer_handle);
2960                    }
2961                }
2962            }
2963        }
2964
2965        let remote_buffers = self.remote_id().zip(remote_buffers);
2966        let client = self.client.clone();
2967
2968        cx.spawn(|this, mut cx| async move {
2969            let mut project_transaction = ProjectTransaction::default();
2970
2971            if let Some((project_id, remote_buffers)) = remote_buffers {
2972                let response = client
2973                    .request(proto::ReloadBuffers {
2974                        project_id,
2975                        buffer_ids: remote_buffers
2976                            .iter()
2977                            .map(|buffer| buffer.read_with(&cx, |buffer, _| buffer.remote_id()))
2978                            .collect(),
2979                    })
2980                    .await?
2981                    .transaction
2982                    .ok_or_else(|| anyhow!("missing transaction"))?;
2983                project_transaction = this
2984                    .update(&mut cx, |this, cx| {
2985                        this.deserialize_project_transaction(response, push_to_history, cx)
2986                    })
2987                    .await?;
2988            }
2989
2990            for buffer in local_buffers {
2991                let transaction = buffer
2992                    .update(&mut cx, |buffer, cx| buffer.reload(cx))
2993                    .await?;
2994                buffer.update(&mut cx, |buffer, cx| {
2995                    if let Some(transaction) = transaction {
2996                        if !push_to_history {
2997                            buffer.forget_transaction(transaction.id);
2998                        }
2999                        project_transaction.0.insert(cx.handle(), transaction);
3000                    }
3001                });
3002            }
3003
3004            Ok(project_transaction)
3005        })
3006    }
3007
3008    pub fn format(
3009        &self,
3010        buffers: HashSet<ModelHandle<Buffer>>,
3011        push_to_history: bool,
3012        cx: &mut ModelContext<Project>,
3013    ) -> Task<Result<ProjectTransaction>> {
3014        let mut local_buffers = Vec::new();
3015        let mut remote_buffers = None;
3016        for buffer_handle in buffers {
3017            let buffer = buffer_handle.read(cx);
3018            if let Some(file) = File::from_dyn(buffer.file()) {
3019                if let Some(buffer_abs_path) = file.as_local().map(|f| f.abs_path(cx)) {
3020                    if let Some((_, server)) = self.language_server_for_buffer(buffer, cx) {
3021                        local_buffers.push((buffer_handle, buffer_abs_path, server.clone()));
3022                    }
3023                } else {
3024                    remote_buffers.get_or_insert(Vec::new()).push(buffer_handle);
3025                }
3026            } else {
3027                return Task::ready(Ok(Default::default()));
3028            }
3029        }
3030
3031        let remote_buffers = self.remote_id().zip(remote_buffers);
3032        let client = self.client.clone();
3033
3034        cx.spawn(|this, mut cx| async move {
3035            let mut project_transaction = ProjectTransaction::default();
3036
3037            if let Some((project_id, remote_buffers)) = remote_buffers {
3038                let response = client
3039                    .request(proto::FormatBuffers {
3040                        project_id,
3041                        buffer_ids: remote_buffers
3042                            .iter()
3043                            .map(|buffer| buffer.read_with(&cx, |buffer, _| buffer.remote_id()))
3044                            .collect(),
3045                    })
3046                    .await?
3047                    .transaction
3048                    .ok_or_else(|| anyhow!("missing transaction"))?;
3049                project_transaction = this
3050                    .update(&mut cx, |this, cx| {
3051                        this.deserialize_project_transaction(response, push_to_history, cx)
3052                    })
3053                    .await?;
3054            }
3055
3056            for (buffer, buffer_abs_path, language_server) in local_buffers {
3057                let (format_on_save, tab_size) = buffer.read_with(&cx, |buffer, cx| {
3058                    let settings = cx.global::<Settings>();
3059                    let language_name = buffer.language().map(|language| language.name());
3060                    (
3061                        settings.format_on_save(language_name.as_deref()),
3062                        settings.tab_size(language_name.as_deref()),
3063                    )
3064                });
3065
3066                let transaction = match format_on_save {
3067                    settings::FormatOnSave::Off => continue,
3068                    settings::FormatOnSave::LanguageServer => Self::format_via_lsp(
3069                        &this,
3070                        &buffer,
3071                        &buffer_abs_path,
3072                        &language_server,
3073                        tab_size,
3074                        &mut cx,
3075                    )
3076                    .await
3077                    .context("failed to format via language server")?,
3078                    settings::FormatOnSave::External { command, arguments } => {
3079                        Self::format_via_external_command(
3080                            &buffer,
3081                            &buffer_abs_path,
3082                            &command,
3083                            &arguments,
3084                            &mut cx,
3085                        )
3086                        .await
3087                        .context(format!(
3088                            "failed to format via external command {:?}",
3089                            command
3090                        ))?
3091                    }
3092                };
3093
3094                if let Some(transaction) = transaction {
3095                    if !push_to_history {
3096                        buffer.update(&mut cx, |buffer, _| {
3097                            buffer.forget_transaction(transaction.id)
3098                        });
3099                    }
3100                    project_transaction.0.insert(buffer, transaction);
3101                }
3102            }
3103
3104            Ok(project_transaction)
3105        })
3106    }
3107
3108    async fn format_via_lsp(
3109        this: &ModelHandle<Self>,
3110        buffer: &ModelHandle<Buffer>,
3111        abs_path: &Path,
3112        language_server: &Arc<LanguageServer>,
3113        tab_size: NonZeroU32,
3114        cx: &mut AsyncAppContext,
3115    ) -> Result<Option<Transaction>> {
3116        let text_document =
3117            lsp::TextDocumentIdentifier::new(lsp::Url::from_file_path(abs_path).unwrap());
3118        let capabilities = &language_server.capabilities();
3119        let lsp_edits = if capabilities
3120            .document_formatting_provider
3121            .as_ref()
3122            .map_or(false, |provider| *provider != lsp::OneOf::Left(false))
3123        {
3124            language_server
3125                .request::<lsp::request::Formatting>(lsp::DocumentFormattingParams {
3126                    text_document,
3127                    options: lsp::FormattingOptions {
3128                        tab_size: tab_size.into(),
3129                        insert_spaces: true,
3130                        insert_final_newline: Some(true),
3131                        ..Default::default()
3132                    },
3133                    work_done_progress_params: Default::default(),
3134                })
3135                .await?
3136        } else if capabilities
3137            .document_range_formatting_provider
3138            .as_ref()
3139            .map_or(false, |provider| *provider != lsp::OneOf::Left(false))
3140        {
3141            let buffer_start = lsp::Position::new(0, 0);
3142            let buffer_end =
3143                buffer.read_with(cx, |buffer, _| point_to_lsp(buffer.max_point_utf16()));
3144            language_server
3145                .request::<lsp::request::RangeFormatting>(lsp::DocumentRangeFormattingParams {
3146                    text_document,
3147                    range: lsp::Range::new(buffer_start, buffer_end),
3148                    options: lsp::FormattingOptions {
3149                        tab_size: tab_size.into(),
3150                        insert_spaces: true,
3151                        insert_final_newline: Some(true),
3152                        ..Default::default()
3153                    },
3154                    work_done_progress_params: Default::default(),
3155                })
3156                .await?
3157        } else {
3158            None
3159        };
3160
3161        if let Some(lsp_edits) = lsp_edits {
3162            let edits = this
3163                .update(cx, |this, cx| {
3164                    this.edits_from_lsp(&buffer, lsp_edits, None, cx)
3165                })
3166                .await?;
3167            buffer.update(cx, |buffer, cx| {
3168                buffer.finalize_last_transaction();
3169                buffer.start_transaction();
3170                for (range, text) in edits {
3171                    buffer.edit([(range, text)], cx);
3172                }
3173                if buffer.end_transaction(cx).is_some() {
3174                    let transaction = buffer.finalize_last_transaction().unwrap().clone();
3175                    Ok(Some(transaction))
3176                } else {
3177                    Ok(None)
3178                }
3179            })
3180        } else {
3181            Ok(None)
3182        }
3183    }
3184
3185    async fn format_via_external_command(
3186        buffer: &ModelHandle<Buffer>,
3187        buffer_abs_path: &Path,
3188        command: &str,
3189        arguments: &[String],
3190        cx: &mut AsyncAppContext,
3191    ) -> Result<Option<Transaction>> {
3192        let working_dir_path = buffer.read_with(cx, |buffer, cx| {
3193            let file = File::from_dyn(buffer.file())?;
3194            let worktree = file.worktree.read(cx).as_local()?;
3195            let mut worktree_path = worktree.abs_path().to_path_buf();
3196            if worktree.root_entry()?.is_file() {
3197                worktree_path.pop();
3198            }
3199            Some(worktree_path)
3200        });
3201
3202        if let Some(working_dir_path) = working_dir_path {
3203            let mut child =
3204                smol::process::Command::new(command)
3205                    .args(arguments.iter().map(|arg| {
3206                        arg.replace("{buffer_path}", &buffer_abs_path.to_string_lossy())
3207                    }))
3208                    .current_dir(&working_dir_path)
3209                    .stdin(smol::process::Stdio::piped())
3210                    .stdout(smol::process::Stdio::piped())
3211                    .stderr(smol::process::Stdio::piped())
3212                    .spawn()?;
3213            let stdin = child
3214                .stdin
3215                .as_mut()
3216                .ok_or_else(|| anyhow!("failed to acquire stdin"))?;
3217            let text = buffer.read_with(cx, |buffer, _| buffer.as_rope().clone());
3218            for chunk in text.chunks() {
3219                stdin.write_all(chunk.as_bytes()).await?;
3220            }
3221            stdin.flush().await?;
3222
3223            let output = child.output().await?;
3224            if !output.status.success() {
3225                return Err(anyhow!(
3226                    "command failed with exit code {:?}:\nstdout: {}\nstderr: {}",
3227                    output.status.code(),
3228                    String::from_utf8_lossy(&output.stdout),
3229                    String::from_utf8_lossy(&output.stderr),
3230                ));
3231            }
3232
3233            let stdout = String::from_utf8(output.stdout)?;
3234            let diff = buffer
3235                .read_with(cx, |buffer, cx| buffer.diff(stdout, cx))
3236                .await;
3237            Ok(buffer.update(cx, |buffer, cx| buffer.apply_diff(diff, cx).cloned()))
3238        } else {
3239            Ok(None)
3240        }
3241    }
3242
3243    pub fn definition<T: ToPointUtf16>(
3244        &self,
3245        buffer: &ModelHandle<Buffer>,
3246        position: T,
3247        cx: &mut ModelContext<Self>,
3248    ) -> Task<Result<Vec<LocationLink>>> {
3249        let position = position.to_point_utf16(buffer.read(cx));
3250        self.request_lsp(buffer.clone(), GetDefinition { position }, cx)
3251    }
3252
3253    pub fn references<T: ToPointUtf16>(
3254        &self,
3255        buffer: &ModelHandle<Buffer>,
3256        position: T,
3257        cx: &mut ModelContext<Self>,
3258    ) -> Task<Result<Vec<Location>>> {
3259        let position = position.to_point_utf16(buffer.read(cx));
3260        self.request_lsp(buffer.clone(), GetReferences { position }, cx)
3261    }
3262
3263    pub fn document_highlights<T: ToPointUtf16>(
3264        &self,
3265        buffer: &ModelHandle<Buffer>,
3266        position: T,
3267        cx: &mut ModelContext<Self>,
3268    ) -> Task<Result<Vec<DocumentHighlight>>> {
3269        let position = position.to_point_utf16(buffer.read(cx));
3270        self.request_lsp(buffer.clone(), GetDocumentHighlights { position }, cx)
3271    }
3272
3273    pub fn symbols(&self, query: &str, cx: &mut ModelContext<Self>) -> Task<Result<Vec<Symbol>>> {
3274        if self.is_local() {
3275            let mut requests = Vec::new();
3276            for ((worktree_id, _), server_id) in self.language_server_ids.iter() {
3277                let worktree_id = *worktree_id;
3278                if let Some(worktree) = self
3279                    .worktree_for_id(worktree_id, cx)
3280                    .and_then(|worktree| worktree.read(cx).as_local())
3281                {
3282                    if let Some(LanguageServerState::Running { adapter, server }) =
3283                        self.language_servers.get(server_id)
3284                    {
3285                        let adapter = adapter.clone();
3286                        let worktree_abs_path = worktree.abs_path().clone();
3287                        requests.push(
3288                            server
3289                                .request::<lsp::request::WorkspaceSymbol>(
3290                                    lsp::WorkspaceSymbolParams {
3291                                        query: query.to_string(),
3292                                        ..Default::default()
3293                                    },
3294                                )
3295                                .log_err()
3296                                .map(move |response| {
3297                                    (
3298                                        adapter,
3299                                        worktree_id,
3300                                        worktree_abs_path,
3301                                        response.unwrap_or_default(),
3302                                    )
3303                                }),
3304                        );
3305                    }
3306                }
3307            }
3308
3309            cx.spawn_weak(|this, cx| async move {
3310                let responses = futures::future::join_all(requests).await;
3311                let this = if let Some(this) = this.upgrade(&cx) {
3312                    this
3313                } else {
3314                    return Ok(Default::default());
3315                };
3316
3317                struct PartialSymbol {
3318                    source_worktree_id: WorktreeId,
3319                    worktree_id: WorktreeId,
3320                    language_server_name: LanguageServerName,
3321                    path: PathBuf,
3322                    language: Option<Arc<Language>>,
3323                    name: String,
3324                    kind: lsp::SymbolKind,
3325                    range: Range<PointUtf16>,
3326                    signature: [u8; 32],
3327                }
3328
3329                let partial_symbols = this.read_with(&cx, |this, cx| {
3330                    let mut partial_symbols = Vec::new();
3331                    for (adapter, source_worktree_id, worktree_abs_path, response) in responses {
3332                        for lsp_symbol in response.into_iter().flatten() {
3333                            let abs_path = match lsp_symbol.location.uri.to_file_path().ok() {
3334                                Some(abs_path) => abs_path,
3335                                None => continue,
3336                            };
3337                            let mut worktree_id = source_worktree_id;
3338                            let path;
3339                            if let Some((worktree, rel_path)) =
3340                                this.find_local_worktree(&abs_path, cx)
3341                            {
3342                                worktree_id = worktree.read(cx).id();
3343                                path = rel_path;
3344                            } else {
3345                                path = relativize_path(&worktree_abs_path, &abs_path);
3346                            }
3347
3348                            let language = this.languages.select_language(&path).clone();
3349                            let signature = this.symbol_signature(worktree_id, &path);
3350
3351                            partial_symbols.push(PartialSymbol {
3352                                source_worktree_id,
3353                                worktree_id,
3354                                language_server_name: adapter.name.clone(),
3355                                name: lsp_symbol.name,
3356                                kind: lsp_symbol.kind,
3357                                language,
3358                                path,
3359                                range: range_from_lsp(lsp_symbol.location.range),
3360                                signature,
3361                            });
3362                        }
3363                    }
3364
3365                    partial_symbols
3366                });
3367
3368                let mut symbols = Vec::new();
3369                for ps in partial_symbols.into_iter() {
3370                    symbols.push(async move {
3371                        let label = match ps.language {
3372                            Some(language) => language.label_for_symbol(&ps.name, ps.kind).await,
3373                            None => None,
3374                        }
3375                        .unwrap_or_else(|| CodeLabel::plain(ps.name.clone(), None));
3376
3377                        Symbol {
3378                            source_worktree_id: ps.source_worktree_id,
3379                            worktree_id: ps.worktree_id,
3380                            language_server_name: ps.language_server_name,
3381                            name: ps.name,
3382                            kind: ps.kind,
3383                            label,
3384                            path: ps.path,
3385                            range: ps.range,
3386                            signature: ps.signature,
3387                        }
3388                    });
3389                }
3390
3391                Ok(futures::future::join_all(symbols).await)
3392            })
3393        } else if let Some(project_id) = self.remote_id() {
3394            let request = self.client.request(proto::GetProjectSymbols {
3395                project_id,
3396                query: query.to_string(),
3397            });
3398            cx.spawn_weak(|this, cx| async move {
3399                let response = request.await?;
3400                let mut symbols = Vec::new();
3401                if let Some(this) = this.upgrade(&cx) {
3402                    let new_symbols = this.read_with(&cx, |this, _| {
3403                        let mut new_symbols = Vec::new();
3404                        for symbol in response.symbols.into_iter() {
3405                            new_symbols.push(this.deserialize_symbol(symbol));
3406                        }
3407                        new_symbols
3408                    });
3409                    symbols = futures::future::join_all(new_symbols.into_iter())
3410                        .await
3411                        .into_iter()
3412                        .filter_map(|symbol| symbol.ok())
3413                        .collect::<Vec<_>>();
3414                }
3415                Ok(symbols)
3416            })
3417        } else {
3418            Task::ready(Ok(Default::default()))
3419        }
3420    }
3421
3422    pub fn open_buffer_for_symbol(
3423        &mut self,
3424        symbol: &Symbol,
3425        cx: &mut ModelContext<Self>,
3426    ) -> Task<Result<ModelHandle<Buffer>>> {
3427        if self.is_local() {
3428            let language_server_id = if let Some(id) = self.language_server_ids.get(&(
3429                symbol.source_worktree_id,
3430                symbol.language_server_name.clone(),
3431            )) {
3432                *id
3433            } else {
3434                return Task::ready(Err(anyhow!(
3435                    "language server for worktree and language not found"
3436                )));
3437            };
3438
3439            let worktree_abs_path = if let Some(worktree_abs_path) = self
3440                .worktree_for_id(symbol.worktree_id, cx)
3441                .and_then(|worktree| worktree.read(cx).as_local())
3442                .map(|local_worktree| local_worktree.abs_path())
3443            {
3444                worktree_abs_path
3445            } else {
3446                return Task::ready(Err(anyhow!("worktree not found for symbol")));
3447            };
3448            let symbol_abs_path = worktree_abs_path.join(&symbol.path);
3449            let symbol_uri = if let Ok(uri) = lsp::Url::from_file_path(symbol_abs_path) {
3450                uri
3451            } else {
3452                return Task::ready(Err(anyhow!("invalid symbol path")));
3453            };
3454
3455            self.open_local_buffer_via_lsp(
3456                symbol_uri,
3457                language_server_id,
3458                symbol.language_server_name.clone(),
3459                cx,
3460            )
3461        } else if let Some(project_id) = self.remote_id() {
3462            let request = self.client.request(proto::OpenBufferForSymbol {
3463                project_id,
3464                symbol: Some(serialize_symbol(symbol)),
3465            });
3466            cx.spawn(|this, mut cx| async move {
3467                let response = request.await?;
3468                let buffer = response.buffer.ok_or_else(|| anyhow!("invalid buffer"))?;
3469                this.update(&mut cx, |this, cx| this.deserialize_buffer(buffer, cx))
3470                    .await
3471            })
3472        } else {
3473            Task::ready(Err(anyhow!("project does not have a remote id")))
3474        }
3475    }
3476
3477    pub fn hover<T: ToPointUtf16>(
3478        &self,
3479        buffer: &ModelHandle<Buffer>,
3480        position: T,
3481        cx: &mut ModelContext<Self>,
3482    ) -> Task<Result<Option<Hover>>> {
3483        let position = position.to_point_utf16(buffer.read(cx));
3484        self.request_lsp(buffer.clone(), GetHover { position }, cx)
3485    }
3486
3487    pub fn completions<T: ToPointUtf16>(
3488        &self,
3489        source_buffer_handle: &ModelHandle<Buffer>,
3490        position: T,
3491        cx: &mut ModelContext<Self>,
3492    ) -> Task<Result<Vec<Completion>>> {
3493        let source_buffer_handle = source_buffer_handle.clone();
3494        let source_buffer = source_buffer_handle.read(cx);
3495        let buffer_id = source_buffer.remote_id();
3496        let language = source_buffer.language().cloned();
3497        let worktree;
3498        let buffer_abs_path;
3499        if let Some(file) = File::from_dyn(source_buffer.file()) {
3500            worktree = file.worktree.clone();
3501            buffer_abs_path = file.as_local().map(|f| f.abs_path(cx));
3502        } else {
3503            return Task::ready(Ok(Default::default()));
3504        };
3505
3506        let position = position.to_point_utf16(source_buffer);
3507        let anchor = source_buffer.anchor_after(position);
3508
3509        if worktree.read(cx).as_local().is_some() {
3510            let buffer_abs_path = buffer_abs_path.unwrap();
3511            let lang_server =
3512                if let Some((_, server)) = self.language_server_for_buffer(source_buffer, cx) {
3513                    server.clone()
3514                } else {
3515                    return Task::ready(Ok(Default::default()));
3516                };
3517
3518            cx.spawn(|_, cx| async move {
3519                let completions = lang_server
3520                    .request::<lsp::request::Completion>(lsp::CompletionParams {
3521                        text_document_position: lsp::TextDocumentPositionParams::new(
3522                            lsp::TextDocumentIdentifier::new(
3523                                lsp::Url::from_file_path(buffer_abs_path).unwrap(),
3524                            ),
3525                            point_to_lsp(position),
3526                        ),
3527                        context: Default::default(),
3528                        work_done_progress_params: Default::default(),
3529                        partial_result_params: Default::default(),
3530                    })
3531                    .await
3532                    .context("lsp completion request failed")?;
3533
3534                let completions = if let Some(completions) = completions {
3535                    match completions {
3536                        lsp::CompletionResponse::Array(completions) => completions,
3537                        lsp::CompletionResponse::List(list) => list.items,
3538                    }
3539                } else {
3540                    Default::default()
3541                };
3542
3543                struct PartialCompletion {
3544                    pub old_range: Range<Anchor>,
3545                    pub new_text: String,
3546                    pub language: Option<Arc<Language>>,
3547                    pub lsp_completion: lsp::CompletionItem,
3548                }
3549
3550                let partial_completions = source_buffer_handle.read_with(&cx, |this, _| {
3551                    let snapshot = this.snapshot();
3552                    let clipped_position = this.clip_point_utf16(position, Bias::Left);
3553                    let mut range_for_token = None;
3554                    let mut partial_completions = Vec::new();
3555
3556                    for lsp_completion in completions.into_iter() {
3557                        // For now, we can only handle additional edits if they are returned
3558                        // when resolving the completion, not if they are present initially.
3559                        if lsp_completion
3560                            .additional_text_edits
3561                            .as_ref()
3562                            .map_or(false, |edits| !edits.is_empty())
3563                        {
3564                            continue;
3565                        }
3566
3567                        let (old_range, mut new_text) = match lsp_completion.text_edit.as_ref() {
3568                            // If the language server provides a range to overwrite, then
3569                            // check that the range is valid.
3570                            Some(lsp::CompletionTextEdit::Edit(edit)) => {
3571                                let range = range_from_lsp(edit.range);
3572                                let start = snapshot.clip_point_utf16(range.start, Bias::Left);
3573                                let end = snapshot.clip_point_utf16(range.end, Bias::Left);
3574                                if start != range.start || end != range.end {
3575                                    log::info!("completion out of expected range");
3576                                    continue;
3577                                }
3578                                (
3579                                    snapshot.anchor_before(start)..snapshot.anchor_after(end),
3580                                    edit.new_text.clone(),
3581                                )
3582                            }
3583                            // If the language server does not provide a range, then infer
3584                            // the range based on the syntax tree.
3585                            None => {
3586                                if position != clipped_position {
3587                                    log::info!("completion out of expected range");
3588                                    continue;
3589                                }
3590                                let Range { start, end } = range_for_token
3591                                    .get_or_insert_with(|| {
3592                                        let offset = position.to_offset(&snapshot);
3593                                        let (range, kind) = snapshot.surrounding_word(offset);
3594                                        if kind == Some(CharKind::Word) {
3595                                            range
3596                                        } else {
3597                                            offset..offset
3598                                        }
3599                                    })
3600                                    .clone();
3601                                let text = lsp_completion
3602                                    .insert_text
3603                                    .as_ref()
3604                                    .unwrap_or(&lsp_completion.label)
3605                                    .clone();
3606                                (
3607                                    snapshot.anchor_before(start)..snapshot.anchor_after(end),
3608                                    text.clone(),
3609                                )
3610                            }
3611                            Some(lsp::CompletionTextEdit::InsertAndReplace(_)) => {
3612                                log::info!("unsupported insert/replace completion");
3613                                continue;
3614                            }
3615                        };
3616
3617                        LineEnding::normalize(&mut new_text);
3618                        let partial_completion = PartialCompletion {
3619                            old_range,
3620                            new_text,
3621                            language: language.clone(),
3622                            lsp_completion,
3623                        };
3624
3625                        partial_completions.push(partial_completion);
3626                    }
3627                    partial_completions
3628                });
3629
3630                let mut result = Vec::new();
3631
3632                for pc in partial_completions.into_iter() {
3633                    result.push(async move {
3634                        let label = match pc.language.as_ref() {
3635                            Some(l) => l.label_for_completion(&pc.lsp_completion).await,
3636                            None => None,
3637                        }
3638                        .unwrap_or_else(|| {
3639                            CodeLabel::plain(
3640                                pc.lsp_completion.label.clone(),
3641                                pc.lsp_completion.filter_text.as_deref(),
3642                            )
3643                        });
3644
3645                        let completion = Completion {
3646                            old_range: pc.old_range,
3647                            new_text: pc.new_text,
3648                            label,
3649                            lsp_completion: pc.lsp_completion,
3650                        };
3651
3652                        completion
3653                    });
3654                }
3655
3656                Ok(futures::future::join_all(result).await)
3657            })
3658        } else if let Some(project_id) = self.remote_id() {
3659            let rpc = self.client.clone();
3660            let message = proto::GetCompletions {
3661                project_id,
3662                buffer_id,
3663                position: Some(language::proto::serialize_anchor(&anchor)),
3664                version: serialize_version(&source_buffer.version()),
3665            };
3666            cx.spawn_weak(|_, mut cx| async move {
3667                let response = rpc.request(message).await?;
3668
3669                source_buffer_handle
3670                    .update(&mut cx, |buffer, _| {
3671                        buffer.wait_for_version(deserialize_version(response.version))
3672                    })
3673                    .await;
3674
3675                let mut result = Vec::new();
3676                for completion in response.completions.into_iter() {
3677                    let completion =
3678                        language::proto::deserialize_completion(completion, language.clone())
3679                            .await?;
3680                    result.push(completion);
3681                }
3682                Ok(result)
3683            })
3684        } else {
3685            Task::ready(Ok(Default::default()))
3686        }
3687    }
3688
3689    pub fn apply_additional_edits_for_completion(
3690        &self,
3691        buffer_handle: ModelHandle<Buffer>,
3692        completion: Completion,
3693        push_to_history: bool,
3694        cx: &mut ModelContext<Self>,
3695    ) -> Task<Result<Option<Transaction>>> {
3696        let buffer = buffer_handle.read(cx);
3697        let buffer_id = buffer.remote_id();
3698
3699        if self.is_local() {
3700            let lang_server = if let Some((_, server)) = self.language_server_for_buffer(buffer, cx)
3701            {
3702                server.clone()
3703            } else {
3704                return Task::ready(Ok(Default::default()));
3705            };
3706
3707            cx.spawn(|this, mut cx| async move {
3708                let resolved_completion = lang_server
3709                    .request::<lsp::request::ResolveCompletionItem>(completion.lsp_completion)
3710                    .await?;
3711                if let Some(edits) = resolved_completion.additional_text_edits {
3712                    let edits = this
3713                        .update(&mut cx, |this, cx| {
3714                            this.edits_from_lsp(&buffer_handle, edits, None, cx)
3715                        })
3716                        .await?;
3717                    buffer_handle.update(&mut cx, |buffer, cx| {
3718                        buffer.finalize_last_transaction();
3719                        buffer.start_transaction();
3720                        for (range, text) in edits {
3721                            buffer.edit([(range, text)], cx);
3722                        }
3723                        let transaction = if buffer.end_transaction(cx).is_some() {
3724                            let transaction = buffer.finalize_last_transaction().unwrap().clone();
3725                            if !push_to_history {
3726                                buffer.forget_transaction(transaction.id);
3727                            }
3728                            Some(transaction)
3729                        } else {
3730                            None
3731                        };
3732                        Ok(transaction)
3733                    })
3734                } else {
3735                    Ok(None)
3736                }
3737            })
3738        } else if let Some(project_id) = self.remote_id() {
3739            let client = self.client.clone();
3740            cx.spawn(|_, mut cx| async move {
3741                let response = client
3742                    .request(proto::ApplyCompletionAdditionalEdits {
3743                        project_id,
3744                        buffer_id,
3745                        completion: Some(language::proto::serialize_completion(&completion)),
3746                    })
3747                    .await?;
3748
3749                if let Some(transaction) = response.transaction {
3750                    let transaction = language::proto::deserialize_transaction(transaction)?;
3751                    buffer_handle
3752                        .update(&mut cx, |buffer, _| {
3753                            buffer.wait_for_edits(transaction.edit_ids.iter().copied())
3754                        })
3755                        .await;
3756                    if push_to_history {
3757                        buffer_handle.update(&mut cx, |buffer, _| {
3758                            buffer.push_transaction(transaction.clone(), Instant::now());
3759                        });
3760                    }
3761                    Ok(Some(transaction))
3762                } else {
3763                    Ok(None)
3764                }
3765            })
3766        } else {
3767            Task::ready(Err(anyhow!("project does not have a remote id")))
3768        }
3769    }
3770
3771    pub fn code_actions<T: Clone + ToOffset>(
3772        &self,
3773        buffer_handle: &ModelHandle<Buffer>,
3774        range: Range<T>,
3775        cx: &mut ModelContext<Self>,
3776    ) -> Task<Result<Vec<CodeAction>>> {
3777        let buffer_handle = buffer_handle.clone();
3778        let buffer = buffer_handle.read(cx);
3779        let snapshot = buffer.snapshot();
3780        let relevant_diagnostics = snapshot
3781            .diagnostics_in_range::<usize, usize>(range.to_offset(&snapshot), false)
3782            .map(|entry| entry.to_lsp_diagnostic_stub())
3783            .collect();
3784        let buffer_id = buffer.remote_id();
3785        let worktree;
3786        let buffer_abs_path;
3787        if let Some(file) = File::from_dyn(buffer.file()) {
3788            worktree = file.worktree.clone();
3789            buffer_abs_path = file.as_local().map(|f| f.abs_path(cx));
3790        } else {
3791            return Task::ready(Ok(Default::default()));
3792        };
3793        let range = buffer.anchor_before(range.start)..buffer.anchor_before(range.end);
3794
3795        if worktree.read(cx).as_local().is_some() {
3796            let buffer_abs_path = buffer_abs_path.unwrap();
3797            let lang_server = if let Some((_, server)) = self.language_server_for_buffer(buffer, cx)
3798            {
3799                server.clone()
3800            } else {
3801                return Task::ready(Ok(Default::default()));
3802            };
3803
3804            let lsp_range = range_to_lsp(range.to_point_utf16(buffer));
3805            cx.foreground().spawn(async move {
3806                if !lang_server.capabilities().code_action_provider.is_some() {
3807                    return Ok(Default::default());
3808                }
3809
3810                Ok(lang_server
3811                    .request::<lsp::request::CodeActionRequest>(lsp::CodeActionParams {
3812                        text_document: lsp::TextDocumentIdentifier::new(
3813                            lsp::Url::from_file_path(buffer_abs_path).unwrap(),
3814                        ),
3815                        range: lsp_range,
3816                        work_done_progress_params: Default::default(),
3817                        partial_result_params: Default::default(),
3818                        context: lsp::CodeActionContext {
3819                            diagnostics: relevant_diagnostics,
3820                            only: Some(vec![
3821                                lsp::CodeActionKind::QUICKFIX,
3822                                lsp::CodeActionKind::REFACTOR,
3823                                lsp::CodeActionKind::REFACTOR_EXTRACT,
3824                                lsp::CodeActionKind::SOURCE,
3825                            ]),
3826                        },
3827                    })
3828                    .await?
3829                    .unwrap_or_default()
3830                    .into_iter()
3831                    .filter_map(|entry| {
3832                        if let lsp::CodeActionOrCommand::CodeAction(lsp_action) = entry {
3833                            Some(CodeAction {
3834                                range: range.clone(),
3835                                lsp_action,
3836                            })
3837                        } else {
3838                            None
3839                        }
3840                    })
3841                    .collect())
3842            })
3843        } else if let Some(project_id) = self.remote_id() {
3844            let rpc = self.client.clone();
3845            let version = buffer.version();
3846            cx.spawn_weak(|_, mut cx| async move {
3847                let response = rpc
3848                    .request(proto::GetCodeActions {
3849                        project_id,
3850                        buffer_id,
3851                        start: Some(language::proto::serialize_anchor(&range.start)),
3852                        end: Some(language::proto::serialize_anchor(&range.end)),
3853                        version: serialize_version(&version),
3854                    })
3855                    .await?;
3856
3857                buffer_handle
3858                    .update(&mut cx, |buffer, _| {
3859                        buffer.wait_for_version(deserialize_version(response.version))
3860                    })
3861                    .await;
3862
3863                response
3864                    .actions
3865                    .into_iter()
3866                    .map(language::proto::deserialize_code_action)
3867                    .collect()
3868            })
3869        } else {
3870            Task::ready(Ok(Default::default()))
3871        }
3872    }
3873
3874    pub fn apply_code_action(
3875        &self,
3876        buffer_handle: ModelHandle<Buffer>,
3877        mut action: CodeAction,
3878        push_to_history: bool,
3879        cx: &mut ModelContext<Self>,
3880    ) -> Task<Result<ProjectTransaction>> {
3881        if self.is_local() {
3882            let buffer = buffer_handle.read(cx);
3883            let (lsp_adapter, lang_server) =
3884                if let Some((adapter, server)) = self.language_server_for_buffer(buffer, cx) {
3885                    (adapter.clone(), server.clone())
3886                } else {
3887                    return Task::ready(Ok(Default::default()));
3888                };
3889            let range = action.range.to_point_utf16(buffer);
3890
3891            cx.spawn(|this, mut cx| async move {
3892                if let Some(lsp_range) = action
3893                    .lsp_action
3894                    .data
3895                    .as_mut()
3896                    .and_then(|d| d.get_mut("codeActionParams"))
3897                    .and_then(|d| d.get_mut("range"))
3898                {
3899                    *lsp_range = serde_json::to_value(&range_to_lsp(range)).unwrap();
3900                    action.lsp_action = lang_server
3901                        .request::<lsp::request::CodeActionResolveRequest>(action.lsp_action)
3902                        .await?;
3903                } else {
3904                    let actions = this
3905                        .update(&mut cx, |this, cx| {
3906                            this.code_actions(&buffer_handle, action.range, cx)
3907                        })
3908                        .await?;
3909                    action.lsp_action = actions
3910                        .into_iter()
3911                        .find(|a| a.lsp_action.title == action.lsp_action.title)
3912                        .ok_or_else(|| anyhow!("code action is outdated"))?
3913                        .lsp_action;
3914                }
3915
3916                if let Some(edit) = action.lsp_action.edit {
3917                    Self::deserialize_workspace_edit(
3918                        this,
3919                        edit,
3920                        push_to_history,
3921                        lsp_adapter.clone(),
3922                        lang_server.clone(),
3923                        &mut cx,
3924                    )
3925                    .await
3926                } else if let Some(command) = action.lsp_action.command {
3927                    this.update(&mut cx, |this, _| {
3928                        this.last_workspace_edits_by_language_server
3929                            .remove(&lang_server.server_id());
3930                    });
3931                    lang_server
3932                        .request::<lsp::request::ExecuteCommand>(lsp::ExecuteCommandParams {
3933                            command: command.command,
3934                            arguments: command.arguments.unwrap_or_default(),
3935                            ..Default::default()
3936                        })
3937                        .await?;
3938                    Ok(this.update(&mut cx, |this, _| {
3939                        this.last_workspace_edits_by_language_server
3940                            .remove(&lang_server.server_id())
3941                            .unwrap_or_default()
3942                    }))
3943                } else {
3944                    Ok(ProjectTransaction::default())
3945                }
3946            })
3947        } else if let Some(project_id) = self.remote_id() {
3948            let client = self.client.clone();
3949            let request = proto::ApplyCodeAction {
3950                project_id,
3951                buffer_id: buffer_handle.read(cx).remote_id(),
3952                action: Some(language::proto::serialize_code_action(&action)),
3953            };
3954            cx.spawn(|this, mut cx| async move {
3955                let response = client
3956                    .request(request)
3957                    .await?
3958                    .transaction
3959                    .ok_or_else(|| anyhow!("missing transaction"))?;
3960                this.update(&mut cx, |this, cx| {
3961                    this.deserialize_project_transaction(response, push_to_history, cx)
3962                })
3963                .await
3964            })
3965        } else {
3966            Task::ready(Err(anyhow!("project does not have a remote id")))
3967        }
3968    }
3969
3970    async fn deserialize_workspace_edit(
3971        this: ModelHandle<Self>,
3972        edit: lsp::WorkspaceEdit,
3973        push_to_history: bool,
3974        lsp_adapter: Arc<LspAdapter>,
3975        language_server: Arc<LanguageServer>,
3976        cx: &mut AsyncAppContext,
3977    ) -> Result<ProjectTransaction> {
3978        let fs = this.read_with(cx, |this, _| this.fs.clone());
3979        let mut operations = Vec::new();
3980        if let Some(document_changes) = edit.document_changes {
3981            match document_changes {
3982                lsp::DocumentChanges::Edits(edits) => {
3983                    operations.extend(edits.into_iter().map(lsp::DocumentChangeOperation::Edit))
3984                }
3985                lsp::DocumentChanges::Operations(ops) => operations = ops,
3986            }
3987        } else if let Some(changes) = edit.changes {
3988            operations.extend(changes.into_iter().map(|(uri, edits)| {
3989                lsp::DocumentChangeOperation::Edit(lsp::TextDocumentEdit {
3990                    text_document: lsp::OptionalVersionedTextDocumentIdentifier {
3991                        uri,
3992                        version: None,
3993                    },
3994                    edits: edits.into_iter().map(lsp::OneOf::Left).collect(),
3995                })
3996            }));
3997        }
3998
3999        let mut project_transaction = ProjectTransaction::default();
4000        for operation in operations {
4001            match operation {
4002                lsp::DocumentChangeOperation::Op(lsp::ResourceOp::Create(op)) => {
4003                    let abs_path = op
4004                        .uri
4005                        .to_file_path()
4006                        .map_err(|_| anyhow!("can't convert URI to path"))?;
4007
4008                    if let Some(parent_path) = abs_path.parent() {
4009                        fs.create_dir(parent_path).await?;
4010                    }
4011                    if abs_path.ends_with("/") {
4012                        fs.create_dir(&abs_path).await?;
4013                    } else {
4014                        fs.create_file(&abs_path, op.options.map(Into::into).unwrap_or_default())
4015                            .await?;
4016                    }
4017                }
4018                lsp::DocumentChangeOperation::Op(lsp::ResourceOp::Rename(op)) => {
4019                    let source_abs_path = op
4020                        .old_uri
4021                        .to_file_path()
4022                        .map_err(|_| anyhow!("can't convert URI to path"))?;
4023                    let target_abs_path = op
4024                        .new_uri
4025                        .to_file_path()
4026                        .map_err(|_| anyhow!("can't convert URI to path"))?;
4027                    fs.rename(
4028                        &source_abs_path,
4029                        &target_abs_path,
4030                        op.options.map(Into::into).unwrap_or_default(),
4031                    )
4032                    .await?;
4033                }
4034                lsp::DocumentChangeOperation::Op(lsp::ResourceOp::Delete(op)) => {
4035                    let abs_path = op
4036                        .uri
4037                        .to_file_path()
4038                        .map_err(|_| anyhow!("can't convert URI to path"))?;
4039                    let options = op.options.map(Into::into).unwrap_or_default();
4040                    if abs_path.ends_with("/") {
4041                        fs.remove_dir(&abs_path, options).await?;
4042                    } else {
4043                        fs.remove_file(&abs_path, options).await?;
4044                    }
4045                }
4046                lsp::DocumentChangeOperation::Edit(op) => {
4047                    let buffer_to_edit = this
4048                        .update(cx, |this, cx| {
4049                            this.open_local_buffer_via_lsp(
4050                                op.text_document.uri,
4051                                language_server.server_id(),
4052                                lsp_adapter.name.clone(),
4053                                cx,
4054                            )
4055                        })
4056                        .await?;
4057
4058                    let edits = this
4059                        .update(cx, |this, cx| {
4060                            let edits = op.edits.into_iter().map(|edit| match edit {
4061                                lsp::OneOf::Left(edit) => edit,
4062                                lsp::OneOf::Right(edit) => edit.text_edit,
4063                            });
4064                            this.edits_from_lsp(
4065                                &buffer_to_edit,
4066                                edits,
4067                                op.text_document.version,
4068                                cx,
4069                            )
4070                        })
4071                        .await?;
4072
4073                    let transaction = buffer_to_edit.update(cx, |buffer, cx| {
4074                        buffer.finalize_last_transaction();
4075                        buffer.start_transaction();
4076                        for (range, text) in edits {
4077                            buffer.edit([(range, text)], cx);
4078                        }
4079                        let transaction = if buffer.end_transaction(cx).is_some() {
4080                            let transaction = buffer.finalize_last_transaction().unwrap().clone();
4081                            if !push_to_history {
4082                                buffer.forget_transaction(transaction.id);
4083                            }
4084                            Some(transaction)
4085                        } else {
4086                            None
4087                        };
4088
4089                        transaction
4090                    });
4091                    if let Some(transaction) = transaction {
4092                        project_transaction.0.insert(buffer_to_edit, transaction);
4093                    }
4094                }
4095            }
4096        }
4097
4098        Ok(project_transaction)
4099    }
4100
4101    pub fn prepare_rename<T: ToPointUtf16>(
4102        &self,
4103        buffer: ModelHandle<Buffer>,
4104        position: T,
4105        cx: &mut ModelContext<Self>,
4106    ) -> Task<Result<Option<Range<Anchor>>>> {
4107        let position = position.to_point_utf16(buffer.read(cx));
4108        self.request_lsp(buffer, PrepareRename { position }, cx)
4109    }
4110
4111    pub fn perform_rename<T: ToPointUtf16>(
4112        &self,
4113        buffer: ModelHandle<Buffer>,
4114        position: T,
4115        new_name: String,
4116        push_to_history: bool,
4117        cx: &mut ModelContext<Self>,
4118    ) -> Task<Result<ProjectTransaction>> {
4119        let position = position.to_point_utf16(buffer.read(cx));
4120        self.request_lsp(
4121            buffer,
4122            PerformRename {
4123                position,
4124                new_name,
4125                push_to_history,
4126            },
4127            cx,
4128        )
4129    }
4130
4131    pub fn search(
4132        &self,
4133        query: SearchQuery,
4134        cx: &mut ModelContext<Self>,
4135    ) -> Task<Result<HashMap<ModelHandle<Buffer>, Vec<Range<Anchor>>>>> {
4136        if self.is_local() {
4137            let snapshots = self
4138                .visible_worktrees(cx)
4139                .filter_map(|tree| {
4140                    let tree = tree.read(cx).as_local()?;
4141                    Some(tree.snapshot())
4142                })
4143                .collect::<Vec<_>>();
4144
4145            let background = cx.background().clone();
4146            let path_count: usize = snapshots.iter().map(|s| s.visible_file_count()).sum();
4147            if path_count == 0 {
4148                return Task::ready(Ok(Default::default()));
4149            }
4150            let workers = background.num_cpus().min(path_count);
4151            let (matching_paths_tx, mut matching_paths_rx) = smol::channel::bounded(1024);
4152            cx.background()
4153                .spawn({
4154                    let fs = self.fs.clone();
4155                    let background = cx.background().clone();
4156                    let query = query.clone();
4157                    async move {
4158                        let fs = &fs;
4159                        let query = &query;
4160                        let matching_paths_tx = &matching_paths_tx;
4161                        let paths_per_worker = (path_count + workers - 1) / workers;
4162                        let snapshots = &snapshots;
4163                        background
4164                            .scoped(|scope| {
4165                                for worker_ix in 0..workers {
4166                                    let worker_start_ix = worker_ix * paths_per_worker;
4167                                    let worker_end_ix = worker_start_ix + paths_per_worker;
4168                                    scope.spawn(async move {
4169                                        let mut snapshot_start_ix = 0;
4170                                        let mut abs_path = PathBuf::new();
4171                                        for snapshot in snapshots {
4172                                            let snapshot_end_ix =
4173                                                snapshot_start_ix + snapshot.visible_file_count();
4174                                            if worker_end_ix <= snapshot_start_ix {
4175                                                break;
4176                                            } else if worker_start_ix > snapshot_end_ix {
4177                                                snapshot_start_ix = snapshot_end_ix;
4178                                                continue;
4179                                            } else {
4180                                                let start_in_snapshot = worker_start_ix
4181                                                    .saturating_sub(snapshot_start_ix);
4182                                                let end_in_snapshot =
4183                                                    cmp::min(worker_end_ix, snapshot_end_ix)
4184                                                        - snapshot_start_ix;
4185
4186                                                for entry in snapshot
4187                                                    .files(false, start_in_snapshot)
4188                                                    .take(end_in_snapshot - start_in_snapshot)
4189                                                {
4190                                                    if matching_paths_tx.is_closed() {
4191                                                        break;
4192                                                    }
4193
4194                                                    abs_path.clear();
4195                                                    abs_path.push(&snapshot.abs_path());
4196                                                    abs_path.push(&entry.path);
4197                                                    let matches = if let Some(file) =
4198                                                        fs.open_sync(&abs_path).await.log_err()
4199                                                    {
4200                                                        query.detect(file).unwrap_or(false)
4201                                                    } else {
4202                                                        false
4203                                                    };
4204
4205                                                    if matches {
4206                                                        let project_path =
4207                                                            (snapshot.id(), entry.path.clone());
4208                                                        if matching_paths_tx
4209                                                            .send(project_path)
4210                                                            .await
4211                                                            .is_err()
4212                                                        {
4213                                                            break;
4214                                                        }
4215                                                    }
4216                                                }
4217
4218                                                snapshot_start_ix = snapshot_end_ix;
4219                                            }
4220                                        }
4221                                    });
4222                                }
4223                            })
4224                            .await;
4225                    }
4226                })
4227                .detach();
4228
4229            let (buffers_tx, buffers_rx) = smol::channel::bounded(1024);
4230            let open_buffers = self
4231                .opened_buffers
4232                .values()
4233                .filter_map(|b| b.upgrade(cx))
4234                .collect::<HashSet<_>>();
4235            cx.spawn(|this, cx| async move {
4236                for buffer in &open_buffers {
4237                    let snapshot = buffer.read_with(&cx, |buffer, _| buffer.snapshot());
4238                    buffers_tx.send((buffer.clone(), snapshot)).await?;
4239                }
4240
4241                let open_buffers = Rc::new(RefCell::new(open_buffers));
4242                while let Some(project_path) = matching_paths_rx.next().await {
4243                    if buffers_tx.is_closed() {
4244                        break;
4245                    }
4246
4247                    let this = this.clone();
4248                    let open_buffers = open_buffers.clone();
4249                    let buffers_tx = buffers_tx.clone();
4250                    cx.spawn(|mut cx| async move {
4251                        if let Some(buffer) = this
4252                            .update(&mut cx, |this, cx| this.open_buffer(project_path, cx))
4253                            .await
4254                            .log_err()
4255                        {
4256                            if open_buffers.borrow_mut().insert(buffer.clone()) {
4257                                let snapshot = buffer.read_with(&cx, |buffer, _| buffer.snapshot());
4258                                buffers_tx.send((buffer, snapshot)).await?;
4259                            }
4260                        }
4261
4262                        Ok::<_, anyhow::Error>(())
4263                    })
4264                    .detach();
4265                }
4266
4267                Ok::<_, anyhow::Error>(())
4268            })
4269            .detach_and_log_err(cx);
4270
4271            let background = cx.background().clone();
4272            cx.background().spawn(async move {
4273                let query = &query;
4274                let mut matched_buffers = Vec::new();
4275                for _ in 0..workers {
4276                    matched_buffers.push(HashMap::default());
4277                }
4278                background
4279                    .scoped(|scope| {
4280                        for worker_matched_buffers in matched_buffers.iter_mut() {
4281                            let mut buffers_rx = buffers_rx.clone();
4282                            scope.spawn(async move {
4283                                while let Some((buffer, snapshot)) = buffers_rx.next().await {
4284                                    let buffer_matches = query
4285                                        .search(snapshot.as_rope())
4286                                        .await
4287                                        .iter()
4288                                        .map(|range| {
4289                                            snapshot.anchor_before(range.start)
4290                                                ..snapshot.anchor_after(range.end)
4291                                        })
4292                                        .collect::<Vec<_>>();
4293                                    if !buffer_matches.is_empty() {
4294                                        worker_matched_buffers
4295                                            .insert(buffer.clone(), buffer_matches);
4296                                    }
4297                                }
4298                            });
4299                        }
4300                    })
4301                    .await;
4302                Ok(matched_buffers.into_iter().flatten().collect())
4303            })
4304        } else if let Some(project_id) = self.remote_id() {
4305            let request = self.client.request(query.to_proto(project_id));
4306            cx.spawn(|this, mut cx| async move {
4307                let response = request.await?;
4308                let mut result = HashMap::default();
4309                for location in response.locations {
4310                    let buffer = location.buffer.ok_or_else(|| anyhow!("missing buffer"))?;
4311                    let target_buffer = this
4312                        .update(&mut cx, |this, cx| this.deserialize_buffer(buffer, cx))
4313                        .await?;
4314                    let start = location
4315                        .start
4316                        .and_then(deserialize_anchor)
4317                        .ok_or_else(|| anyhow!("missing target start"))?;
4318                    let end = location
4319                        .end
4320                        .and_then(deserialize_anchor)
4321                        .ok_or_else(|| anyhow!("missing target end"))?;
4322                    result
4323                        .entry(target_buffer)
4324                        .or_insert(Vec::new())
4325                        .push(start..end)
4326                }
4327                Ok(result)
4328            })
4329        } else {
4330            Task::ready(Ok(Default::default()))
4331        }
4332    }
4333
4334    fn request_lsp<R: LspCommand>(
4335        &self,
4336        buffer_handle: ModelHandle<Buffer>,
4337        request: R,
4338        cx: &mut ModelContext<Self>,
4339    ) -> Task<Result<R::Response>>
4340    where
4341        <R::LspRequest as lsp::request::Request>::Result: Send,
4342    {
4343        let buffer = buffer_handle.read(cx);
4344        if self.is_local() {
4345            let file = File::from_dyn(buffer.file()).and_then(File::as_local);
4346            if let Some((file, language_server)) = file.zip(
4347                self.language_server_for_buffer(buffer, cx)
4348                    .map(|(_, server)| server.clone()),
4349            ) {
4350                let lsp_params = request.to_lsp(&file.abs_path(cx), cx);
4351                return cx.spawn(|this, cx| async move {
4352                    if !request.check_capabilities(&language_server.capabilities()) {
4353                        return Ok(Default::default());
4354                    }
4355
4356                    let response = language_server
4357                        .request::<R::LspRequest>(lsp_params)
4358                        .await
4359                        .context("lsp request failed")?;
4360                    request
4361                        .response_from_lsp(response, this, buffer_handle, cx)
4362                        .await
4363                });
4364            }
4365        } else if let Some(project_id) = self.remote_id() {
4366            let rpc = self.client.clone();
4367            let message = request.to_proto(project_id, buffer);
4368            return cx.spawn(|this, cx| async move {
4369                let response = rpc.request(message).await?;
4370                request
4371                    .response_from_proto(response, this, buffer_handle, cx)
4372                    .await
4373            });
4374        }
4375        Task::ready(Ok(Default::default()))
4376    }
4377
4378    pub fn find_or_create_local_worktree(
4379        &mut self,
4380        abs_path: impl AsRef<Path>,
4381        visible: bool,
4382        cx: &mut ModelContext<Self>,
4383    ) -> Task<Result<(ModelHandle<Worktree>, PathBuf)>> {
4384        let abs_path = abs_path.as_ref();
4385        if let Some((tree, relative_path)) = self.find_local_worktree(abs_path, cx) {
4386            Task::ready(Ok((tree.clone(), relative_path.into())))
4387        } else {
4388            let worktree = self.create_local_worktree(abs_path, visible, cx);
4389            cx.foreground()
4390                .spawn(async move { Ok((worktree.await?, PathBuf::new())) })
4391        }
4392    }
4393
4394    pub fn find_local_worktree(
4395        &self,
4396        abs_path: &Path,
4397        cx: &AppContext,
4398    ) -> Option<(ModelHandle<Worktree>, PathBuf)> {
4399        for tree in &self.worktrees {
4400            if let Some(tree) = tree.upgrade(cx) {
4401                if let Some(relative_path) = tree
4402                    .read(cx)
4403                    .as_local()
4404                    .and_then(|t| abs_path.strip_prefix(t.abs_path()).ok())
4405                {
4406                    return Some((tree.clone(), relative_path.into()));
4407                }
4408            }
4409        }
4410        None
4411    }
4412
4413    pub fn is_shared(&self) -> bool {
4414        match &self.client_state {
4415            ProjectClientState::Local { is_shared, .. } => *is_shared,
4416            ProjectClientState::Remote { .. } => false,
4417        }
4418    }
4419
4420    fn create_local_worktree(
4421        &mut self,
4422        abs_path: impl AsRef<Path>,
4423        visible: bool,
4424        cx: &mut ModelContext<Self>,
4425    ) -> Task<Result<ModelHandle<Worktree>>> {
4426        let fs = self.fs.clone();
4427        let client = self.client.clone();
4428        let next_entry_id = self.next_entry_id.clone();
4429        let path: Arc<Path> = abs_path.as_ref().into();
4430        let task = self
4431            .loading_local_worktrees
4432            .entry(path.clone())
4433            .or_insert_with(|| {
4434                cx.spawn(|project, mut cx| {
4435                    async move {
4436                        let worktree = Worktree::local(
4437                            client.clone(),
4438                            path.clone(),
4439                            visible,
4440                            fs,
4441                            next_entry_id,
4442                            &mut cx,
4443                        )
4444                        .await;
4445                        project.update(&mut cx, |project, _| {
4446                            project.loading_local_worktrees.remove(&path);
4447                        });
4448                        let worktree = worktree?;
4449
4450                        let project_id = project.update(&mut cx, |project, cx| {
4451                            project.add_worktree(&worktree, cx);
4452                            project.shared_remote_id()
4453                        });
4454
4455                        if let Some(project_id) = project_id {
4456                            worktree
4457                                .update(&mut cx, |worktree, cx| {
4458                                    worktree.as_local_mut().unwrap().share(project_id, cx)
4459                                })
4460                                .await
4461                                .log_err();
4462                        }
4463
4464                        Ok(worktree)
4465                    }
4466                    .map_err(|err| Arc::new(err))
4467                })
4468                .shared()
4469            })
4470            .clone();
4471        cx.foreground().spawn(async move {
4472            match task.await {
4473                Ok(worktree) => Ok(worktree),
4474                Err(err) => Err(anyhow!("{}", err)),
4475            }
4476        })
4477    }
4478
4479    pub fn remove_worktree(&mut self, id_to_remove: WorktreeId, cx: &mut ModelContext<Self>) {
4480        self.worktrees.retain(|worktree| {
4481            if let Some(worktree) = worktree.upgrade(cx) {
4482                let id = worktree.read(cx).id();
4483                if id == id_to_remove {
4484                    cx.emit(Event::WorktreeRemoved(id));
4485                    false
4486                } else {
4487                    true
4488                }
4489            } else {
4490                false
4491            }
4492        });
4493        self.metadata_changed(true, cx);
4494        cx.notify();
4495    }
4496
4497    fn add_worktree(&mut self, worktree: &ModelHandle<Worktree>, cx: &mut ModelContext<Self>) {
4498        cx.observe(&worktree, |_, _, cx| cx.notify()).detach();
4499        if worktree.read(cx).is_local() {
4500            cx.subscribe(&worktree, |this, worktree, _, cx| {
4501                this.update_local_worktree_buffers(worktree, cx);
4502            })
4503            .detach();
4504        }
4505
4506        let push_strong_handle = {
4507            let worktree = worktree.read(cx);
4508            self.is_shared() || worktree.is_visible() || worktree.is_remote()
4509        };
4510        if push_strong_handle {
4511            self.worktrees
4512                .push(WorktreeHandle::Strong(worktree.clone()));
4513        } else {
4514            self.worktrees
4515                .push(WorktreeHandle::Weak(worktree.downgrade()));
4516        }
4517
4518        self.metadata_changed(true, cx);
4519        cx.observe_release(&worktree, |this, worktree, cx| {
4520            this.remove_worktree(worktree.id(), cx);
4521            cx.notify();
4522        })
4523        .detach();
4524
4525        cx.emit(Event::WorktreeAdded);
4526        cx.notify();
4527    }
4528
4529    fn update_local_worktree_buffers(
4530        &mut self,
4531        worktree_handle: ModelHandle<Worktree>,
4532        cx: &mut ModelContext<Self>,
4533    ) {
4534        let snapshot = worktree_handle.read(cx).snapshot();
4535        let mut buffers_to_delete = Vec::new();
4536        let mut renamed_buffers = Vec::new();
4537        for (buffer_id, buffer) in &self.opened_buffers {
4538            if let Some(buffer) = buffer.upgrade(cx) {
4539                buffer.update(cx, |buffer, cx| {
4540                    if let Some(old_file) = File::from_dyn(buffer.file()) {
4541                        if old_file.worktree != worktree_handle {
4542                            return;
4543                        }
4544
4545                        let new_file = if let Some(entry) = old_file
4546                            .entry_id
4547                            .and_then(|entry_id| snapshot.entry_for_id(entry_id))
4548                        {
4549                            File {
4550                                is_local: true,
4551                                entry_id: Some(entry.id),
4552                                mtime: entry.mtime,
4553                                path: entry.path.clone(),
4554                                worktree: worktree_handle.clone(),
4555                            }
4556                        } else if let Some(entry) =
4557                            snapshot.entry_for_path(old_file.path().as_ref())
4558                        {
4559                            File {
4560                                is_local: true,
4561                                entry_id: Some(entry.id),
4562                                mtime: entry.mtime,
4563                                path: entry.path.clone(),
4564                                worktree: worktree_handle.clone(),
4565                            }
4566                        } else {
4567                            File {
4568                                is_local: true,
4569                                entry_id: None,
4570                                path: old_file.path().clone(),
4571                                mtime: old_file.mtime(),
4572                                worktree: worktree_handle.clone(),
4573                            }
4574                        };
4575
4576                        let old_path = old_file.abs_path(cx);
4577                        if new_file.abs_path(cx) != old_path {
4578                            renamed_buffers.push((cx.handle(), old_path));
4579                        }
4580
4581                        if let Some(project_id) = self.shared_remote_id() {
4582                            self.client
4583                                .send(proto::UpdateBufferFile {
4584                                    project_id,
4585                                    buffer_id: *buffer_id as u64,
4586                                    file: Some(new_file.to_proto()),
4587                                })
4588                                .log_err();
4589                        }
4590                        buffer.file_updated(Arc::new(new_file), cx).detach();
4591                    }
4592                });
4593            } else {
4594                buffers_to_delete.push(*buffer_id);
4595            }
4596        }
4597
4598        for buffer_id in buffers_to_delete {
4599            self.opened_buffers.remove(&buffer_id);
4600        }
4601
4602        for (buffer, old_path) in renamed_buffers {
4603            self.unregister_buffer_from_language_server(&buffer, old_path, cx);
4604            self.assign_language_to_buffer(&buffer, cx);
4605            self.register_buffer_with_language_server(&buffer, cx);
4606        }
4607    }
4608
4609    pub fn set_active_path(&mut self, entry: Option<ProjectPath>, cx: &mut ModelContext<Self>) {
4610        let new_active_entry = entry.and_then(|project_path| {
4611            let worktree = self.worktree_for_id(project_path.worktree_id, cx)?;
4612            let entry = worktree.read(cx).entry_for_path(project_path.path)?;
4613            Some(entry.id)
4614        });
4615        if new_active_entry != self.active_entry {
4616            self.active_entry = new_active_entry;
4617            cx.emit(Event::ActiveEntryChanged(new_active_entry));
4618        }
4619    }
4620
4621    pub fn language_servers_running_disk_based_diagnostics<'a>(
4622        &'a self,
4623    ) -> impl 'a + Iterator<Item = usize> {
4624        self.language_server_statuses
4625            .iter()
4626            .filter_map(|(id, status)| {
4627                if status.has_pending_diagnostic_updates {
4628                    Some(*id)
4629                } else {
4630                    None
4631                }
4632            })
4633    }
4634
4635    pub fn diagnostic_summary(&self, cx: &AppContext) -> DiagnosticSummary {
4636        let mut summary = DiagnosticSummary::default();
4637        for (_, path_summary) in self.diagnostic_summaries(cx) {
4638            summary.error_count += path_summary.error_count;
4639            summary.warning_count += path_summary.warning_count;
4640        }
4641        summary
4642    }
4643
4644    pub fn diagnostic_summaries<'a>(
4645        &'a self,
4646        cx: &'a AppContext,
4647    ) -> impl Iterator<Item = (ProjectPath, DiagnosticSummary)> + 'a {
4648        self.visible_worktrees(cx).flat_map(move |worktree| {
4649            let worktree = worktree.read(cx);
4650            let worktree_id = worktree.id();
4651            worktree
4652                .diagnostic_summaries()
4653                .map(move |(path, summary)| (ProjectPath { worktree_id, path }, summary))
4654        })
4655    }
4656
4657    pub fn disk_based_diagnostics_started(
4658        &mut self,
4659        language_server_id: usize,
4660        cx: &mut ModelContext<Self>,
4661    ) {
4662        cx.emit(Event::DiskBasedDiagnosticsStarted { language_server_id });
4663    }
4664
4665    pub fn disk_based_diagnostics_finished(
4666        &mut self,
4667        language_server_id: usize,
4668        cx: &mut ModelContext<Self>,
4669    ) {
4670        cx.emit(Event::DiskBasedDiagnosticsFinished { language_server_id });
4671    }
4672
4673    pub fn active_entry(&self) -> Option<ProjectEntryId> {
4674        self.active_entry
4675    }
4676
4677    pub fn entry_for_path(&self, path: &ProjectPath, cx: &AppContext) -> Option<ProjectEntryId> {
4678        self.worktree_for_id(path.worktree_id, cx)?
4679            .read(cx)
4680            .entry_for_path(&path.path)
4681            .map(|entry| entry.id)
4682    }
4683
4684    pub fn path_for_entry(&self, entry_id: ProjectEntryId, cx: &AppContext) -> Option<ProjectPath> {
4685        let worktree = self.worktree_for_entry(entry_id, cx)?;
4686        let worktree = worktree.read(cx);
4687        let worktree_id = worktree.id();
4688        let path = worktree.entry_for_id(entry_id)?.path.clone();
4689        Some(ProjectPath { worktree_id, path })
4690    }
4691
4692    // RPC message handlers
4693
4694    async fn handle_request_join_project(
4695        this: ModelHandle<Self>,
4696        message: TypedEnvelope<proto::RequestJoinProject>,
4697        _: Arc<Client>,
4698        mut cx: AsyncAppContext,
4699    ) -> Result<()> {
4700        let user_id = message.payload.requester_id;
4701        if this.read_with(&cx, |project, _| {
4702            project.collaborators.values().any(|c| c.user.id == user_id)
4703        }) {
4704            this.update(&mut cx, |this, cx| {
4705                this.respond_to_join_request(user_id, true, cx)
4706            });
4707        } else {
4708            let user_store = this.read_with(&cx, |this, _| this.user_store.clone());
4709            let user = user_store
4710                .update(&mut cx, |store, cx| store.fetch_user(user_id, cx))
4711                .await?;
4712            this.update(&mut cx, |_, cx| cx.emit(Event::ContactRequestedJoin(user)));
4713        }
4714        Ok(())
4715    }
4716
4717    async fn handle_unregister_project(
4718        this: ModelHandle<Self>,
4719        _: TypedEnvelope<proto::UnregisterProject>,
4720        _: Arc<Client>,
4721        mut cx: AsyncAppContext,
4722    ) -> Result<()> {
4723        this.update(&mut cx, |this, cx| this.removed_from_project(cx));
4724        Ok(())
4725    }
4726
4727    async fn handle_project_unshared(
4728        this: ModelHandle<Self>,
4729        _: TypedEnvelope<proto::ProjectUnshared>,
4730        _: Arc<Client>,
4731        mut cx: AsyncAppContext,
4732    ) -> Result<()> {
4733        this.update(&mut cx, |this, cx| this.unshared(cx));
4734        Ok(())
4735    }
4736
4737    async fn handle_add_collaborator(
4738        this: ModelHandle<Self>,
4739        mut envelope: TypedEnvelope<proto::AddProjectCollaborator>,
4740        _: Arc<Client>,
4741        mut cx: AsyncAppContext,
4742    ) -> Result<()> {
4743        let user_store = this.read_with(&cx, |this, _| this.user_store.clone());
4744        let collaborator = envelope
4745            .payload
4746            .collaborator
4747            .take()
4748            .ok_or_else(|| anyhow!("empty collaborator"))?;
4749
4750        let collaborator = Collaborator::from_proto(collaborator, &user_store, &mut cx).await?;
4751        this.update(&mut cx, |this, cx| {
4752            this.collaborators
4753                .insert(collaborator.peer_id, collaborator);
4754            cx.notify();
4755        });
4756
4757        Ok(())
4758    }
4759
4760    async fn handle_remove_collaborator(
4761        this: ModelHandle<Self>,
4762        envelope: TypedEnvelope<proto::RemoveProjectCollaborator>,
4763        _: Arc<Client>,
4764        mut cx: AsyncAppContext,
4765    ) -> Result<()> {
4766        this.update(&mut cx, |this, cx| {
4767            let peer_id = PeerId(envelope.payload.peer_id);
4768            let replica_id = this
4769                .collaborators
4770                .remove(&peer_id)
4771                .ok_or_else(|| anyhow!("unknown peer {:?}", peer_id))?
4772                .replica_id;
4773            for (_, buffer) in &this.opened_buffers {
4774                if let Some(buffer) = buffer.upgrade(cx) {
4775                    buffer.update(cx, |buffer, cx| buffer.remove_peer(replica_id, cx));
4776                }
4777            }
4778
4779            cx.emit(Event::CollaboratorLeft(peer_id));
4780            cx.notify();
4781            Ok(())
4782        })
4783    }
4784
4785    async fn handle_join_project_request_cancelled(
4786        this: ModelHandle<Self>,
4787        envelope: TypedEnvelope<proto::JoinProjectRequestCancelled>,
4788        _: Arc<Client>,
4789        mut cx: AsyncAppContext,
4790    ) -> Result<()> {
4791        let user = this
4792            .update(&mut cx, |this, cx| {
4793                this.user_store.update(cx, |user_store, cx| {
4794                    user_store.fetch_user(envelope.payload.requester_id, cx)
4795                })
4796            })
4797            .await?;
4798
4799        this.update(&mut cx, |_, cx| {
4800            cx.emit(Event::ContactCancelledJoinRequest(user));
4801        });
4802
4803        Ok(())
4804    }
4805
4806    async fn handle_update_project(
4807        this: ModelHandle<Self>,
4808        envelope: TypedEnvelope<proto::UpdateProject>,
4809        client: Arc<Client>,
4810        mut cx: AsyncAppContext,
4811    ) -> Result<()> {
4812        this.update(&mut cx, |this, cx| {
4813            let replica_id = this.replica_id();
4814            let remote_id = this.remote_id().ok_or_else(|| anyhow!("invalid project"))?;
4815
4816            let mut old_worktrees_by_id = this
4817                .worktrees
4818                .drain(..)
4819                .filter_map(|worktree| {
4820                    let worktree = worktree.upgrade(cx)?;
4821                    Some((worktree.read(cx).id(), worktree))
4822                })
4823                .collect::<HashMap<_, _>>();
4824
4825            for worktree in envelope.payload.worktrees {
4826                if let Some(old_worktree) =
4827                    old_worktrees_by_id.remove(&WorktreeId::from_proto(worktree.id))
4828                {
4829                    this.worktrees.push(WorktreeHandle::Strong(old_worktree));
4830                } else {
4831                    let worktree =
4832                        Worktree::remote(remote_id, replica_id, worktree, client.clone(), cx);
4833                    this.add_worktree(&worktree, cx);
4834                }
4835            }
4836
4837            this.metadata_changed(true, cx);
4838            for (id, _) in old_worktrees_by_id {
4839                cx.emit(Event::WorktreeRemoved(id));
4840            }
4841
4842            Ok(())
4843        })
4844    }
4845
4846    async fn handle_update_worktree(
4847        this: ModelHandle<Self>,
4848        envelope: TypedEnvelope<proto::UpdateWorktree>,
4849        _: Arc<Client>,
4850        mut cx: AsyncAppContext,
4851    ) -> Result<()> {
4852        this.update(&mut cx, |this, cx| {
4853            let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
4854            if let Some(worktree) = this.worktree_for_id(worktree_id, cx) {
4855                worktree.update(cx, |worktree, _| {
4856                    let worktree = worktree.as_remote_mut().unwrap();
4857                    worktree.update_from_remote(envelope.payload);
4858                });
4859            }
4860            Ok(())
4861        })
4862    }
4863
4864    async fn handle_create_project_entry(
4865        this: ModelHandle<Self>,
4866        envelope: TypedEnvelope<proto::CreateProjectEntry>,
4867        _: Arc<Client>,
4868        mut cx: AsyncAppContext,
4869    ) -> Result<proto::ProjectEntryResponse> {
4870        let worktree = this.update(&mut cx, |this, cx| {
4871            let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
4872            this.worktree_for_id(worktree_id, cx)
4873                .ok_or_else(|| anyhow!("worktree not found"))
4874        })?;
4875        let worktree_scan_id = worktree.read_with(&cx, |worktree, _| worktree.scan_id());
4876        let entry = worktree
4877            .update(&mut cx, |worktree, cx| {
4878                let worktree = worktree.as_local_mut().unwrap();
4879                let path = PathBuf::from(OsString::from_vec(envelope.payload.path));
4880                worktree.create_entry(path, envelope.payload.is_directory, cx)
4881            })
4882            .await?;
4883        Ok(proto::ProjectEntryResponse {
4884            entry: Some((&entry).into()),
4885            worktree_scan_id: worktree_scan_id as u64,
4886        })
4887    }
4888
4889    async fn handle_rename_project_entry(
4890        this: ModelHandle<Self>,
4891        envelope: TypedEnvelope<proto::RenameProjectEntry>,
4892        _: Arc<Client>,
4893        mut cx: AsyncAppContext,
4894    ) -> Result<proto::ProjectEntryResponse> {
4895        let entry_id = ProjectEntryId::from_proto(envelope.payload.entry_id);
4896        let worktree = this.read_with(&cx, |this, cx| {
4897            this.worktree_for_entry(entry_id, cx)
4898                .ok_or_else(|| anyhow!("worktree not found"))
4899        })?;
4900        let worktree_scan_id = worktree.read_with(&cx, |worktree, _| worktree.scan_id());
4901        let entry = worktree
4902            .update(&mut cx, |worktree, cx| {
4903                let new_path = PathBuf::from(OsString::from_vec(envelope.payload.new_path));
4904                worktree
4905                    .as_local_mut()
4906                    .unwrap()
4907                    .rename_entry(entry_id, new_path, cx)
4908                    .ok_or_else(|| anyhow!("invalid entry"))
4909            })?
4910            .await?;
4911        Ok(proto::ProjectEntryResponse {
4912            entry: Some((&entry).into()),
4913            worktree_scan_id: worktree_scan_id as u64,
4914        })
4915    }
4916
4917    async fn handle_copy_project_entry(
4918        this: ModelHandle<Self>,
4919        envelope: TypedEnvelope<proto::CopyProjectEntry>,
4920        _: Arc<Client>,
4921        mut cx: AsyncAppContext,
4922    ) -> Result<proto::ProjectEntryResponse> {
4923        let entry_id = ProjectEntryId::from_proto(envelope.payload.entry_id);
4924        let worktree = this.read_with(&cx, |this, cx| {
4925            this.worktree_for_entry(entry_id, cx)
4926                .ok_or_else(|| anyhow!("worktree not found"))
4927        })?;
4928        let worktree_scan_id = worktree.read_with(&cx, |worktree, _| worktree.scan_id());
4929        let entry = worktree
4930            .update(&mut cx, |worktree, cx| {
4931                let new_path = PathBuf::from(OsString::from_vec(envelope.payload.new_path));
4932                worktree
4933                    .as_local_mut()
4934                    .unwrap()
4935                    .copy_entry(entry_id, new_path, cx)
4936                    .ok_or_else(|| anyhow!("invalid entry"))
4937            })?
4938            .await?;
4939        Ok(proto::ProjectEntryResponse {
4940            entry: Some((&entry).into()),
4941            worktree_scan_id: worktree_scan_id as u64,
4942        })
4943    }
4944
4945    async fn handle_delete_project_entry(
4946        this: ModelHandle<Self>,
4947        envelope: TypedEnvelope<proto::DeleteProjectEntry>,
4948        _: Arc<Client>,
4949        mut cx: AsyncAppContext,
4950    ) -> Result<proto::ProjectEntryResponse> {
4951        let entry_id = ProjectEntryId::from_proto(envelope.payload.entry_id);
4952        let worktree = this.read_with(&cx, |this, cx| {
4953            this.worktree_for_entry(entry_id, cx)
4954                .ok_or_else(|| anyhow!("worktree not found"))
4955        })?;
4956        let worktree_scan_id = worktree.read_with(&cx, |worktree, _| worktree.scan_id());
4957        worktree
4958            .update(&mut cx, |worktree, cx| {
4959                worktree
4960                    .as_local_mut()
4961                    .unwrap()
4962                    .delete_entry(entry_id, cx)
4963                    .ok_or_else(|| anyhow!("invalid entry"))
4964            })?
4965            .await?;
4966        Ok(proto::ProjectEntryResponse {
4967            entry: None,
4968            worktree_scan_id: worktree_scan_id as u64,
4969        })
4970    }
4971
4972    async fn handle_update_diagnostic_summary(
4973        this: ModelHandle<Self>,
4974        envelope: TypedEnvelope<proto::UpdateDiagnosticSummary>,
4975        _: Arc<Client>,
4976        mut cx: AsyncAppContext,
4977    ) -> Result<()> {
4978        this.update(&mut cx, |this, cx| {
4979            let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
4980            if let Some(worktree) = this.worktree_for_id(worktree_id, cx) {
4981                if let Some(summary) = envelope.payload.summary {
4982                    let project_path = ProjectPath {
4983                        worktree_id,
4984                        path: Path::new(&summary.path).into(),
4985                    };
4986                    worktree.update(cx, |worktree, _| {
4987                        worktree
4988                            .as_remote_mut()
4989                            .unwrap()
4990                            .update_diagnostic_summary(project_path.path.clone(), &summary);
4991                    });
4992                    cx.emit(Event::DiagnosticsUpdated {
4993                        language_server_id: summary.language_server_id as usize,
4994                        path: project_path,
4995                    });
4996                }
4997            }
4998            Ok(())
4999        })
5000    }
5001
5002    async fn handle_start_language_server(
5003        this: ModelHandle<Self>,
5004        envelope: TypedEnvelope<proto::StartLanguageServer>,
5005        _: Arc<Client>,
5006        mut cx: AsyncAppContext,
5007    ) -> Result<()> {
5008        let server = envelope
5009            .payload
5010            .server
5011            .ok_or_else(|| anyhow!("invalid server"))?;
5012        this.update(&mut cx, |this, cx| {
5013            this.language_server_statuses.insert(
5014                server.id as usize,
5015                LanguageServerStatus {
5016                    name: server.name,
5017                    pending_work: Default::default(),
5018                    has_pending_diagnostic_updates: false,
5019                    progress_tokens: Default::default(),
5020                },
5021            );
5022            cx.notify();
5023        });
5024        Ok(())
5025    }
5026
5027    async fn handle_update_language_server(
5028        this: ModelHandle<Self>,
5029        envelope: TypedEnvelope<proto::UpdateLanguageServer>,
5030        _: Arc<Client>,
5031        mut cx: AsyncAppContext,
5032    ) -> Result<()> {
5033        let language_server_id = envelope.payload.language_server_id as usize;
5034        match envelope
5035            .payload
5036            .variant
5037            .ok_or_else(|| anyhow!("invalid variant"))?
5038        {
5039            proto::update_language_server::Variant::WorkStart(payload) => {
5040                this.update(&mut cx, |this, cx| {
5041                    this.on_lsp_work_start(
5042                        language_server_id,
5043                        payload.token,
5044                        LanguageServerProgress {
5045                            message: payload.message,
5046                            percentage: payload.percentage.map(|p| p as usize),
5047                            last_update_at: Instant::now(),
5048                        },
5049                        cx,
5050                    );
5051                })
5052            }
5053            proto::update_language_server::Variant::WorkProgress(payload) => {
5054                this.update(&mut cx, |this, cx| {
5055                    this.on_lsp_work_progress(
5056                        language_server_id,
5057                        payload.token,
5058                        LanguageServerProgress {
5059                            message: payload.message,
5060                            percentage: payload.percentage.map(|p| p as usize),
5061                            last_update_at: Instant::now(),
5062                        },
5063                        cx,
5064                    );
5065                })
5066            }
5067            proto::update_language_server::Variant::WorkEnd(payload) => {
5068                this.update(&mut cx, |this, cx| {
5069                    this.on_lsp_work_end(language_server_id, payload.token, cx);
5070                })
5071            }
5072            proto::update_language_server::Variant::DiskBasedDiagnosticsUpdating(_) => {
5073                this.update(&mut cx, |this, cx| {
5074                    this.disk_based_diagnostics_started(language_server_id, cx);
5075                })
5076            }
5077            proto::update_language_server::Variant::DiskBasedDiagnosticsUpdated(_) => {
5078                this.update(&mut cx, |this, cx| {
5079                    this.disk_based_diagnostics_finished(language_server_id, cx)
5080                });
5081            }
5082        }
5083
5084        Ok(())
5085    }
5086
5087    async fn handle_update_buffer(
5088        this: ModelHandle<Self>,
5089        envelope: TypedEnvelope<proto::UpdateBuffer>,
5090        _: Arc<Client>,
5091        mut cx: AsyncAppContext,
5092    ) -> Result<()> {
5093        this.update(&mut cx, |this, cx| {
5094            let payload = envelope.payload.clone();
5095            let buffer_id = payload.buffer_id;
5096            let ops = payload
5097                .operations
5098                .into_iter()
5099                .map(|op| language::proto::deserialize_operation(op))
5100                .collect::<Result<Vec<_>, _>>()?;
5101            let is_remote = this.is_remote();
5102            match this.opened_buffers.entry(buffer_id) {
5103                hash_map::Entry::Occupied(mut e) => match e.get_mut() {
5104                    OpenBuffer::Strong(buffer) => {
5105                        buffer.update(cx, |buffer, cx| buffer.apply_ops(ops, cx))?;
5106                    }
5107                    OpenBuffer::Loading(operations) => operations.extend_from_slice(&ops),
5108                    OpenBuffer::Weak(_) => {}
5109                },
5110                hash_map::Entry::Vacant(e) => {
5111                    assert!(
5112                        is_remote,
5113                        "received buffer update from {:?}",
5114                        envelope.original_sender_id
5115                    );
5116                    e.insert(OpenBuffer::Loading(ops));
5117                }
5118            }
5119            Ok(())
5120        })
5121    }
5122
5123    async fn handle_update_buffer_file(
5124        this: ModelHandle<Self>,
5125        envelope: TypedEnvelope<proto::UpdateBufferFile>,
5126        _: Arc<Client>,
5127        mut cx: AsyncAppContext,
5128    ) -> Result<()> {
5129        this.update(&mut cx, |this, cx| {
5130            let payload = envelope.payload.clone();
5131            let buffer_id = payload.buffer_id;
5132            let file = payload.file.ok_or_else(|| anyhow!("invalid file"))?;
5133            let worktree = this
5134                .worktree_for_id(WorktreeId::from_proto(file.worktree_id), cx)
5135                .ok_or_else(|| anyhow!("no such worktree"))?;
5136            let file = File::from_proto(file, worktree.clone(), cx)?;
5137            let buffer = this
5138                .opened_buffers
5139                .get_mut(&buffer_id)
5140                .and_then(|b| b.upgrade(cx))
5141                .ok_or_else(|| anyhow!("no such buffer"))?;
5142            buffer.update(cx, |buffer, cx| {
5143                buffer.file_updated(Arc::new(file), cx).detach();
5144            });
5145            Ok(())
5146        })
5147    }
5148
5149    async fn handle_save_buffer(
5150        this: ModelHandle<Self>,
5151        envelope: TypedEnvelope<proto::SaveBuffer>,
5152        _: Arc<Client>,
5153        mut cx: AsyncAppContext,
5154    ) -> Result<proto::BufferSaved> {
5155        let buffer_id = envelope.payload.buffer_id;
5156        let requested_version = deserialize_version(envelope.payload.version);
5157
5158        let (project_id, buffer) = this.update(&mut cx, |this, cx| {
5159            let project_id = this.remote_id().ok_or_else(|| anyhow!("not connected"))?;
5160            let buffer = this
5161                .opened_buffers
5162                .get(&buffer_id)
5163                .and_then(|buffer| buffer.upgrade(cx))
5164                .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))?;
5165            Ok::<_, anyhow::Error>((project_id, buffer))
5166        })?;
5167        buffer
5168            .update(&mut cx, |buffer, _| {
5169                buffer.wait_for_version(requested_version)
5170            })
5171            .await;
5172
5173        let (saved_version, fingerprint, mtime) =
5174            buffer.update(&mut cx, |buffer, cx| buffer.save(cx)).await?;
5175        Ok(proto::BufferSaved {
5176            project_id,
5177            buffer_id,
5178            version: serialize_version(&saved_version),
5179            mtime: Some(mtime.into()),
5180            fingerprint,
5181        })
5182    }
5183
5184    async fn handle_reload_buffers(
5185        this: ModelHandle<Self>,
5186        envelope: TypedEnvelope<proto::ReloadBuffers>,
5187        _: Arc<Client>,
5188        mut cx: AsyncAppContext,
5189    ) -> Result<proto::ReloadBuffersResponse> {
5190        let sender_id = envelope.original_sender_id()?;
5191        let reload = this.update(&mut cx, |this, cx| {
5192            let mut buffers = HashSet::default();
5193            for buffer_id in &envelope.payload.buffer_ids {
5194                buffers.insert(
5195                    this.opened_buffers
5196                        .get(buffer_id)
5197                        .and_then(|buffer| buffer.upgrade(cx))
5198                        .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))?,
5199                );
5200            }
5201            Ok::<_, anyhow::Error>(this.reload_buffers(buffers, false, cx))
5202        })?;
5203
5204        let project_transaction = reload.await?;
5205        let project_transaction = this.update(&mut cx, |this, cx| {
5206            this.serialize_project_transaction_for_peer(project_transaction, sender_id, cx)
5207        });
5208        Ok(proto::ReloadBuffersResponse {
5209            transaction: Some(project_transaction),
5210        })
5211    }
5212
5213    async fn handle_format_buffers(
5214        this: ModelHandle<Self>,
5215        envelope: TypedEnvelope<proto::FormatBuffers>,
5216        _: Arc<Client>,
5217        mut cx: AsyncAppContext,
5218    ) -> Result<proto::FormatBuffersResponse> {
5219        let sender_id = envelope.original_sender_id()?;
5220        let format = this.update(&mut cx, |this, cx| {
5221            let mut buffers = HashSet::default();
5222            for buffer_id in &envelope.payload.buffer_ids {
5223                buffers.insert(
5224                    this.opened_buffers
5225                        .get(buffer_id)
5226                        .and_then(|buffer| buffer.upgrade(cx))
5227                        .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))?,
5228                );
5229            }
5230            Ok::<_, anyhow::Error>(this.format(buffers, false, cx))
5231        })?;
5232
5233        let project_transaction = format.await?;
5234        let project_transaction = this.update(&mut cx, |this, cx| {
5235            this.serialize_project_transaction_for_peer(project_transaction, sender_id, cx)
5236        });
5237        Ok(proto::FormatBuffersResponse {
5238            transaction: Some(project_transaction),
5239        })
5240    }
5241
5242    async fn handle_get_completions(
5243        this: ModelHandle<Self>,
5244        envelope: TypedEnvelope<proto::GetCompletions>,
5245        _: Arc<Client>,
5246        mut cx: AsyncAppContext,
5247    ) -> Result<proto::GetCompletionsResponse> {
5248        let position = envelope
5249            .payload
5250            .position
5251            .and_then(language::proto::deserialize_anchor)
5252            .ok_or_else(|| anyhow!("invalid position"))?;
5253        let version = deserialize_version(envelope.payload.version);
5254        let buffer = this.read_with(&cx, |this, cx| {
5255            this.opened_buffers
5256                .get(&envelope.payload.buffer_id)
5257                .and_then(|buffer| buffer.upgrade(cx))
5258                .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))
5259        })?;
5260        buffer
5261            .update(&mut cx, |buffer, _| buffer.wait_for_version(version))
5262            .await;
5263        let version = buffer.read_with(&cx, |buffer, _| buffer.version());
5264        let completions = this
5265            .update(&mut cx, |this, cx| this.completions(&buffer, position, cx))
5266            .await?;
5267
5268        Ok(proto::GetCompletionsResponse {
5269            completions: completions
5270                .iter()
5271                .map(language::proto::serialize_completion)
5272                .collect(),
5273            version: serialize_version(&version),
5274        })
5275    }
5276
5277    async fn handle_apply_additional_edits_for_completion(
5278        this: ModelHandle<Self>,
5279        envelope: TypedEnvelope<proto::ApplyCompletionAdditionalEdits>,
5280        _: Arc<Client>,
5281        mut cx: AsyncAppContext,
5282    ) -> Result<proto::ApplyCompletionAdditionalEditsResponse> {
5283        let (buffer, completion) = this.update(&mut cx, |this, cx| {
5284            let buffer = this
5285                .opened_buffers
5286                .get(&envelope.payload.buffer_id)
5287                .and_then(|buffer| buffer.upgrade(cx))
5288                .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))?;
5289            let language = buffer.read(cx).language();
5290            let completion = language::proto::deserialize_completion(
5291                envelope
5292                    .payload
5293                    .completion
5294                    .ok_or_else(|| anyhow!("invalid completion"))?,
5295                language.cloned(),
5296            );
5297            Ok::<_, anyhow::Error>((buffer, completion))
5298        })?;
5299
5300        let completion = completion.await?;
5301
5302        let apply_additional_edits = this.update(&mut cx, |this, cx| {
5303            this.apply_additional_edits_for_completion(buffer, completion, false, cx)
5304        });
5305
5306        Ok(proto::ApplyCompletionAdditionalEditsResponse {
5307            transaction: apply_additional_edits
5308                .await?
5309                .as_ref()
5310                .map(language::proto::serialize_transaction),
5311        })
5312    }
5313
5314    async fn handle_get_code_actions(
5315        this: ModelHandle<Self>,
5316        envelope: TypedEnvelope<proto::GetCodeActions>,
5317        _: Arc<Client>,
5318        mut cx: AsyncAppContext,
5319    ) -> Result<proto::GetCodeActionsResponse> {
5320        let start = envelope
5321            .payload
5322            .start
5323            .and_then(language::proto::deserialize_anchor)
5324            .ok_or_else(|| anyhow!("invalid start"))?;
5325        let end = envelope
5326            .payload
5327            .end
5328            .and_then(language::proto::deserialize_anchor)
5329            .ok_or_else(|| anyhow!("invalid end"))?;
5330        let buffer = this.update(&mut cx, |this, cx| {
5331            this.opened_buffers
5332                .get(&envelope.payload.buffer_id)
5333                .and_then(|buffer| buffer.upgrade(cx))
5334                .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))
5335        })?;
5336        buffer
5337            .update(&mut cx, |buffer, _| {
5338                buffer.wait_for_version(deserialize_version(envelope.payload.version))
5339            })
5340            .await;
5341
5342        let version = buffer.read_with(&cx, |buffer, _| buffer.version());
5343        let code_actions = this.update(&mut cx, |this, cx| {
5344            Ok::<_, anyhow::Error>(this.code_actions(&buffer, start..end, cx))
5345        })?;
5346
5347        Ok(proto::GetCodeActionsResponse {
5348            actions: code_actions
5349                .await?
5350                .iter()
5351                .map(language::proto::serialize_code_action)
5352                .collect(),
5353            version: serialize_version(&version),
5354        })
5355    }
5356
5357    async fn handle_apply_code_action(
5358        this: ModelHandle<Self>,
5359        envelope: TypedEnvelope<proto::ApplyCodeAction>,
5360        _: Arc<Client>,
5361        mut cx: AsyncAppContext,
5362    ) -> Result<proto::ApplyCodeActionResponse> {
5363        let sender_id = envelope.original_sender_id()?;
5364        let action = language::proto::deserialize_code_action(
5365            envelope
5366                .payload
5367                .action
5368                .ok_or_else(|| anyhow!("invalid action"))?,
5369        )?;
5370        let apply_code_action = this.update(&mut cx, |this, cx| {
5371            let buffer = this
5372                .opened_buffers
5373                .get(&envelope.payload.buffer_id)
5374                .and_then(|buffer| buffer.upgrade(cx))
5375                .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))?;
5376            Ok::<_, anyhow::Error>(this.apply_code_action(buffer, action, false, cx))
5377        })?;
5378
5379        let project_transaction = apply_code_action.await?;
5380        let project_transaction = this.update(&mut cx, |this, cx| {
5381            this.serialize_project_transaction_for_peer(project_transaction, sender_id, cx)
5382        });
5383        Ok(proto::ApplyCodeActionResponse {
5384            transaction: Some(project_transaction),
5385        })
5386    }
5387
5388    async fn handle_lsp_command<T: LspCommand>(
5389        this: ModelHandle<Self>,
5390        envelope: TypedEnvelope<T::ProtoRequest>,
5391        _: Arc<Client>,
5392        mut cx: AsyncAppContext,
5393    ) -> Result<<T::ProtoRequest as proto::RequestMessage>::Response>
5394    where
5395        <T::LspRequest as lsp::request::Request>::Result: Send,
5396    {
5397        let sender_id = envelope.original_sender_id()?;
5398        let buffer_id = T::buffer_id_from_proto(&envelope.payload);
5399        let buffer_handle = this.read_with(&cx, |this, _| {
5400            this.opened_buffers
5401                .get(&buffer_id)
5402                .and_then(|buffer| buffer.upgrade(&cx))
5403                .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))
5404        })?;
5405        let request = T::from_proto(
5406            envelope.payload,
5407            this.clone(),
5408            buffer_handle.clone(),
5409            cx.clone(),
5410        )
5411        .await?;
5412        let buffer_version = buffer_handle.read_with(&cx, |buffer, _| buffer.version());
5413        let response = this
5414            .update(&mut cx, |this, cx| {
5415                this.request_lsp(buffer_handle, request, cx)
5416            })
5417            .await?;
5418        this.update(&mut cx, |this, cx| {
5419            Ok(T::response_to_proto(
5420                response,
5421                this,
5422                sender_id,
5423                &buffer_version,
5424                cx,
5425            ))
5426        })
5427    }
5428
5429    async fn handle_get_project_symbols(
5430        this: ModelHandle<Self>,
5431        envelope: TypedEnvelope<proto::GetProjectSymbols>,
5432        _: Arc<Client>,
5433        mut cx: AsyncAppContext,
5434    ) -> Result<proto::GetProjectSymbolsResponse> {
5435        let symbols = this
5436            .update(&mut cx, |this, cx| {
5437                this.symbols(&envelope.payload.query, cx)
5438            })
5439            .await?;
5440
5441        Ok(proto::GetProjectSymbolsResponse {
5442            symbols: symbols.iter().map(serialize_symbol).collect(),
5443        })
5444    }
5445
5446    async fn handle_search_project(
5447        this: ModelHandle<Self>,
5448        envelope: TypedEnvelope<proto::SearchProject>,
5449        _: Arc<Client>,
5450        mut cx: AsyncAppContext,
5451    ) -> Result<proto::SearchProjectResponse> {
5452        let peer_id = envelope.original_sender_id()?;
5453        let query = SearchQuery::from_proto(envelope.payload)?;
5454        let result = this
5455            .update(&mut cx, |this, cx| this.search(query, cx))
5456            .await?;
5457
5458        this.update(&mut cx, |this, cx| {
5459            let mut locations = Vec::new();
5460            for (buffer, ranges) in result {
5461                for range in ranges {
5462                    let start = serialize_anchor(&range.start);
5463                    let end = serialize_anchor(&range.end);
5464                    let buffer = this.serialize_buffer_for_peer(&buffer, peer_id, cx);
5465                    locations.push(proto::Location {
5466                        buffer: Some(buffer),
5467                        start: Some(start),
5468                        end: Some(end),
5469                    });
5470                }
5471            }
5472            Ok(proto::SearchProjectResponse { locations })
5473        })
5474    }
5475
5476    async fn handle_open_buffer_for_symbol(
5477        this: ModelHandle<Self>,
5478        envelope: TypedEnvelope<proto::OpenBufferForSymbol>,
5479        _: Arc<Client>,
5480        mut cx: AsyncAppContext,
5481    ) -> Result<proto::OpenBufferForSymbolResponse> {
5482        let peer_id = envelope.original_sender_id()?;
5483        let symbol = envelope
5484            .payload
5485            .symbol
5486            .ok_or_else(|| anyhow!("invalid symbol"))?;
5487        let symbol = this
5488            .read_with(&cx, |this, _| this.deserialize_symbol(symbol))
5489            .await?;
5490        let symbol = this.read_with(&cx, |this, _| {
5491            let signature = this.symbol_signature(symbol.worktree_id, &symbol.path);
5492            if signature == symbol.signature {
5493                Ok(symbol)
5494            } else {
5495                Err(anyhow!("invalid symbol signature"))
5496            }
5497        })?;
5498        let buffer = this
5499            .update(&mut cx, |this, cx| this.open_buffer_for_symbol(&symbol, cx))
5500            .await?;
5501
5502        Ok(proto::OpenBufferForSymbolResponse {
5503            buffer: Some(this.update(&mut cx, |this, cx| {
5504                this.serialize_buffer_for_peer(&buffer, peer_id, cx)
5505            })),
5506        })
5507    }
5508
5509    fn symbol_signature(&self, worktree_id: WorktreeId, path: &Path) -> [u8; 32] {
5510        let mut hasher = Sha256::new();
5511        hasher.update(worktree_id.to_proto().to_be_bytes());
5512        hasher.update(path.to_string_lossy().as_bytes());
5513        hasher.update(self.nonce.to_be_bytes());
5514        hasher.finalize().as_slice().try_into().unwrap()
5515    }
5516
5517    async fn handle_open_buffer_by_id(
5518        this: ModelHandle<Self>,
5519        envelope: TypedEnvelope<proto::OpenBufferById>,
5520        _: Arc<Client>,
5521        mut cx: AsyncAppContext,
5522    ) -> Result<proto::OpenBufferResponse> {
5523        let peer_id = envelope.original_sender_id()?;
5524        let buffer = this
5525            .update(&mut cx, |this, cx| {
5526                this.open_buffer_by_id(envelope.payload.id, cx)
5527            })
5528            .await?;
5529        this.update(&mut cx, |this, cx| {
5530            Ok(proto::OpenBufferResponse {
5531                buffer: Some(this.serialize_buffer_for_peer(&buffer, peer_id, cx)),
5532            })
5533        })
5534    }
5535
5536    async fn handle_open_buffer_by_path(
5537        this: ModelHandle<Self>,
5538        envelope: TypedEnvelope<proto::OpenBufferByPath>,
5539        _: Arc<Client>,
5540        mut cx: AsyncAppContext,
5541    ) -> Result<proto::OpenBufferResponse> {
5542        let peer_id = envelope.original_sender_id()?;
5543        let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
5544        let open_buffer = this.update(&mut cx, |this, cx| {
5545            this.open_buffer(
5546                ProjectPath {
5547                    worktree_id,
5548                    path: PathBuf::from(envelope.payload.path).into(),
5549                },
5550                cx,
5551            )
5552        });
5553
5554        let buffer = open_buffer.await?;
5555        this.update(&mut cx, |this, cx| {
5556            Ok(proto::OpenBufferResponse {
5557                buffer: Some(this.serialize_buffer_for_peer(&buffer, peer_id, cx)),
5558            })
5559        })
5560    }
5561
5562    fn serialize_project_transaction_for_peer(
5563        &mut self,
5564        project_transaction: ProjectTransaction,
5565        peer_id: PeerId,
5566        cx: &AppContext,
5567    ) -> proto::ProjectTransaction {
5568        let mut serialized_transaction = proto::ProjectTransaction {
5569            buffers: Default::default(),
5570            transactions: Default::default(),
5571        };
5572        for (buffer, transaction) in project_transaction.0 {
5573            serialized_transaction
5574                .buffers
5575                .push(self.serialize_buffer_for_peer(&buffer, peer_id, cx));
5576            serialized_transaction
5577                .transactions
5578                .push(language::proto::serialize_transaction(&transaction));
5579        }
5580        serialized_transaction
5581    }
5582
5583    fn deserialize_project_transaction(
5584        &mut self,
5585        message: proto::ProjectTransaction,
5586        push_to_history: bool,
5587        cx: &mut ModelContext<Self>,
5588    ) -> Task<Result<ProjectTransaction>> {
5589        cx.spawn(|this, mut cx| async move {
5590            let mut project_transaction = ProjectTransaction::default();
5591            for (buffer, transaction) in message.buffers.into_iter().zip(message.transactions) {
5592                let buffer = this
5593                    .update(&mut cx, |this, cx| this.deserialize_buffer(buffer, cx))
5594                    .await?;
5595                let transaction = language::proto::deserialize_transaction(transaction)?;
5596                project_transaction.0.insert(buffer, transaction);
5597            }
5598
5599            for (buffer, transaction) in &project_transaction.0 {
5600                buffer
5601                    .update(&mut cx, |buffer, _| {
5602                        buffer.wait_for_edits(transaction.edit_ids.iter().copied())
5603                    })
5604                    .await;
5605
5606                if push_to_history {
5607                    buffer.update(&mut cx, |buffer, _| {
5608                        buffer.push_transaction(transaction.clone(), Instant::now());
5609                    });
5610                }
5611            }
5612
5613            Ok(project_transaction)
5614        })
5615    }
5616
5617    fn serialize_buffer_for_peer(
5618        &mut self,
5619        buffer: &ModelHandle<Buffer>,
5620        peer_id: PeerId,
5621        cx: &AppContext,
5622    ) -> proto::Buffer {
5623        let buffer_id = buffer.read(cx).remote_id();
5624        let shared_buffers = self.shared_buffers.entry(peer_id).or_default();
5625        if shared_buffers.insert(buffer_id) {
5626            proto::Buffer {
5627                variant: Some(proto::buffer::Variant::State(buffer.read(cx).to_proto())),
5628            }
5629        } else {
5630            proto::Buffer {
5631                variant: Some(proto::buffer::Variant::Id(buffer_id)),
5632            }
5633        }
5634    }
5635
5636    fn deserialize_buffer(
5637        &mut self,
5638        buffer: proto::Buffer,
5639        cx: &mut ModelContext<Self>,
5640    ) -> Task<Result<ModelHandle<Buffer>>> {
5641        let replica_id = self.replica_id();
5642
5643        let opened_buffer_tx = self.opened_buffer.0.clone();
5644        let mut opened_buffer_rx = self.opened_buffer.1.clone();
5645        cx.spawn(|this, mut cx| async move {
5646            match buffer.variant.ok_or_else(|| anyhow!("missing buffer"))? {
5647                proto::buffer::Variant::Id(id) => {
5648                    let buffer = loop {
5649                        let buffer = this.read_with(&cx, |this, cx| {
5650                            this.opened_buffers
5651                                .get(&id)
5652                                .and_then(|buffer| buffer.upgrade(cx))
5653                        });
5654                        if let Some(buffer) = buffer {
5655                            break buffer;
5656                        }
5657                        opened_buffer_rx
5658                            .next()
5659                            .await
5660                            .ok_or_else(|| anyhow!("project dropped while waiting for buffer"))?;
5661                    };
5662                    Ok(buffer)
5663                }
5664                proto::buffer::Variant::State(mut buffer) => {
5665                    let mut buffer_worktree = None;
5666                    let mut buffer_file = None;
5667                    if let Some(file) = buffer.file.take() {
5668                        this.read_with(&cx, |this, cx| {
5669                            let worktree_id = WorktreeId::from_proto(file.worktree_id);
5670                            let worktree =
5671                                this.worktree_for_id(worktree_id, cx).ok_or_else(|| {
5672                                    anyhow!("no worktree found for id {}", file.worktree_id)
5673                                })?;
5674                            buffer_file =
5675                                Some(Arc::new(File::from_proto(file, worktree.clone(), cx)?)
5676                                    as Arc<dyn language::File>);
5677                            buffer_worktree = Some(worktree);
5678                            Ok::<_, anyhow::Error>(())
5679                        })?;
5680                    }
5681
5682                    let buffer = cx.add_model(|cx| {
5683                        Buffer::from_proto(replica_id, buffer, buffer_file, cx).unwrap()
5684                    });
5685
5686                    this.update(&mut cx, |this, cx| this.register_buffer(&buffer, cx))?;
5687
5688                    *opened_buffer_tx.borrow_mut().borrow_mut() = ();
5689                    Ok(buffer)
5690                }
5691            }
5692        })
5693    }
5694
5695    fn deserialize_symbol(
5696        &self,
5697        serialized_symbol: proto::Symbol,
5698    ) -> impl Future<Output = Result<Symbol>> {
5699        let languages = self.languages.clone();
5700        async move {
5701            let source_worktree_id = WorktreeId::from_proto(serialized_symbol.source_worktree_id);
5702            let worktree_id = WorktreeId::from_proto(serialized_symbol.worktree_id);
5703            let start = serialized_symbol
5704                .start
5705                .ok_or_else(|| anyhow!("invalid start"))?;
5706            let end = serialized_symbol
5707                .end
5708                .ok_or_else(|| anyhow!("invalid end"))?;
5709            let kind = unsafe { mem::transmute(serialized_symbol.kind) };
5710            let path = PathBuf::from(serialized_symbol.path);
5711            let language = languages.select_language(&path);
5712            Ok(Symbol {
5713                source_worktree_id,
5714                worktree_id,
5715                language_server_name: LanguageServerName(
5716                    serialized_symbol.language_server_name.into(),
5717                ),
5718                label: {
5719                    match language {
5720                        Some(language) => {
5721                            language
5722                                .label_for_symbol(&serialized_symbol.name, kind)
5723                                .await
5724                        }
5725                        None => None,
5726                    }
5727                    .unwrap_or_else(|| CodeLabel::plain(serialized_symbol.name.clone(), None))
5728                },
5729
5730                name: serialized_symbol.name,
5731                path,
5732                range: PointUtf16::new(start.row, start.column)
5733                    ..PointUtf16::new(end.row, end.column),
5734                kind,
5735                signature: serialized_symbol
5736                    .signature
5737                    .try_into()
5738                    .map_err(|_| anyhow!("invalid signature"))?,
5739            })
5740        }
5741    }
5742
5743    async fn handle_buffer_saved(
5744        this: ModelHandle<Self>,
5745        envelope: TypedEnvelope<proto::BufferSaved>,
5746        _: Arc<Client>,
5747        mut cx: AsyncAppContext,
5748    ) -> Result<()> {
5749        let version = deserialize_version(envelope.payload.version);
5750        let mtime = envelope
5751            .payload
5752            .mtime
5753            .ok_or_else(|| anyhow!("missing mtime"))?
5754            .into();
5755
5756        this.update(&mut cx, |this, cx| {
5757            let buffer = this
5758                .opened_buffers
5759                .get(&envelope.payload.buffer_id)
5760                .and_then(|buffer| buffer.upgrade(cx));
5761            if let Some(buffer) = buffer {
5762                buffer.update(cx, |buffer, cx| {
5763                    buffer.did_save(version, envelope.payload.fingerprint, mtime, None, cx);
5764                });
5765            }
5766            Ok(())
5767        })
5768    }
5769
5770    async fn handle_buffer_reloaded(
5771        this: ModelHandle<Self>,
5772        envelope: TypedEnvelope<proto::BufferReloaded>,
5773        _: Arc<Client>,
5774        mut cx: AsyncAppContext,
5775    ) -> Result<()> {
5776        let payload = envelope.payload;
5777        let version = deserialize_version(payload.version);
5778        let line_ending = deserialize_line_ending(
5779            proto::LineEnding::from_i32(payload.line_ending)
5780                .ok_or_else(|| anyhow!("missing line ending"))?,
5781        );
5782        let mtime = payload
5783            .mtime
5784            .ok_or_else(|| anyhow!("missing mtime"))?
5785            .into();
5786        this.update(&mut cx, |this, cx| {
5787            let buffer = this
5788                .opened_buffers
5789                .get(&payload.buffer_id)
5790                .and_then(|buffer| buffer.upgrade(cx));
5791            if let Some(buffer) = buffer {
5792                buffer.update(cx, |buffer, cx| {
5793                    buffer.did_reload(version, payload.fingerprint, line_ending, mtime, cx);
5794                });
5795            }
5796            Ok(())
5797        })
5798    }
5799
5800    pub fn match_paths<'a>(
5801        &self,
5802        query: &'a str,
5803        include_ignored: bool,
5804        smart_case: bool,
5805        max_results: usize,
5806        cancel_flag: &'a AtomicBool,
5807        cx: &AppContext,
5808    ) -> impl 'a + Future<Output = Vec<PathMatch>> {
5809        let worktrees = self
5810            .worktrees(cx)
5811            .filter(|worktree| worktree.read(cx).is_visible())
5812            .collect::<Vec<_>>();
5813        let include_root_name = worktrees.len() > 1;
5814        let candidate_sets = worktrees
5815            .into_iter()
5816            .map(|worktree| CandidateSet {
5817                snapshot: worktree.read(cx).snapshot(),
5818                include_ignored,
5819                include_root_name,
5820            })
5821            .collect::<Vec<_>>();
5822
5823        let background = cx.background().clone();
5824        async move {
5825            fuzzy::match_paths(
5826                candidate_sets.as_slice(),
5827                query,
5828                smart_case,
5829                max_results,
5830                cancel_flag,
5831                background,
5832            )
5833            .await
5834        }
5835    }
5836
5837    fn edits_from_lsp(
5838        &mut self,
5839        buffer: &ModelHandle<Buffer>,
5840        lsp_edits: impl 'static + Send + IntoIterator<Item = lsp::TextEdit>,
5841        version: Option<i32>,
5842        cx: &mut ModelContext<Self>,
5843    ) -> Task<Result<Vec<(Range<Anchor>, String)>>> {
5844        let snapshot = self.buffer_snapshot_for_lsp_version(buffer, version, cx);
5845        cx.background().spawn(async move {
5846            let snapshot = snapshot?;
5847            let mut lsp_edits = lsp_edits
5848                .into_iter()
5849                .map(|edit| (range_from_lsp(edit.range), edit.new_text))
5850                .collect::<Vec<_>>();
5851            lsp_edits.sort_by_key(|(range, _)| range.start);
5852
5853            let mut lsp_edits = lsp_edits.into_iter().peekable();
5854            let mut edits = Vec::new();
5855            while let Some((mut range, mut new_text)) = lsp_edits.next() {
5856                // Combine any LSP edits that are adjacent.
5857                //
5858                // Also, combine LSP edits that are separated from each other by only
5859                // a newline. This is important because for some code actions,
5860                // Rust-analyzer rewrites the entire buffer via a series of edits that
5861                // are separated by unchanged newline characters.
5862                //
5863                // In order for the diffing logic below to work properly, any edits that
5864                // cancel each other out must be combined into one.
5865                while let Some((next_range, next_text)) = lsp_edits.peek() {
5866                    if next_range.start > range.end {
5867                        if next_range.start.row > range.end.row + 1
5868                            || next_range.start.column > 0
5869                            || snapshot.clip_point_utf16(
5870                                PointUtf16::new(range.end.row, u32::MAX),
5871                                Bias::Left,
5872                            ) > range.end
5873                        {
5874                            break;
5875                        }
5876                        new_text.push('\n');
5877                    }
5878                    range.end = next_range.end;
5879                    new_text.push_str(&next_text);
5880                    lsp_edits.next();
5881                }
5882
5883                if snapshot.clip_point_utf16(range.start, Bias::Left) != range.start
5884                    || snapshot.clip_point_utf16(range.end, Bias::Left) != range.end
5885                {
5886                    return Err(anyhow!("invalid edits received from language server"));
5887                }
5888
5889                // For multiline edits, perform a diff of the old and new text so that
5890                // we can identify the changes more precisely, preserving the locations
5891                // of any anchors positioned in the unchanged regions.
5892                if range.end.row > range.start.row {
5893                    let mut offset = range.start.to_offset(&snapshot);
5894                    let old_text = snapshot.text_for_range(range).collect::<String>();
5895
5896                    let diff = TextDiff::from_lines(old_text.as_str(), &new_text);
5897                    let mut moved_since_edit = true;
5898                    for change in diff.iter_all_changes() {
5899                        let tag = change.tag();
5900                        let value = change.value();
5901                        match tag {
5902                            ChangeTag::Equal => {
5903                                offset += value.len();
5904                                moved_since_edit = true;
5905                            }
5906                            ChangeTag::Delete => {
5907                                let start = snapshot.anchor_after(offset);
5908                                let end = snapshot.anchor_before(offset + value.len());
5909                                if moved_since_edit {
5910                                    edits.push((start..end, String::new()));
5911                                } else {
5912                                    edits.last_mut().unwrap().0.end = end;
5913                                }
5914                                offset += value.len();
5915                                moved_since_edit = false;
5916                            }
5917                            ChangeTag::Insert => {
5918                                if moved_since_edit {
5919                                    let anchor = snapshot.anchor_after(offset);
5920                                    edits.push((anchor.clone()..anchor, value.to_string()));
5921                                } else {
5922                                    edits.last_mut().unwrap().1.push_str(value);
5923                                }
5924                                moved_since_edit = false;
5925                            }
5926                        }
5927                    }
5928                } else if range.end == range.start {
5929                    let anchor = snapshot.anchor_after(range.start);
5930                    edits.push((anchor.clone()..anchor, new_text));
5931                } else {
5932                    let edit_start = snapshot.anchor_after(range.start);
5933                    let edit_end = snapshot.anchor_before(range.end);
5934                    edits.push((edit_start..edit_end, new_text));
5935                }
5936            }
5937
5938            Ok(edits)
5939        })
5940    }
5941
5942    fn buffer_snapshot_for_lsp_version(
5943        &mut self,
5944        buffer: &ModelHandle<Buffer>,
5945        version: Option<i32>,
5946        cx: &AppContext,
5947    ) -> Result<TextBufferSnapshot> {
5948        const OLD_VERSIONS_TO_RETAIN: i32 = 10;
5949
5950        if let Some(version) = version {
5951            let buffer_id = buffer.read(cx).remote_id();
5952            let snapshots = self
5953                .buffer_snapshots
5954                .get_mut(&buffer_id)
5955                .ok_or_else(|| anyhow!("no snapshot found for buffer {}", buffer_id))?;
5956            let mut found_snapshot = None;
5957            snapshots.retain(|(snapshot_version, snapshot)| {
5958                if snapshot_version + OLD_VERSIONS_TO_RETAIN < version {
5959                    false
5960                } else {
5961                    if *snapshot_version == version {
5962                        found_snapshot = Some(snapshot.clone());
5963                    }
5964                    true
5965                }
5966            });
5967
5968            found_snapshot.ok_or_else(|| {
5969                anyhow!(
5970                    "snapshot not found for buffer {} at version {}",
5971                    buffer_id,
5972                    version
5973                )
5974            })
5975        } else {
5976            Ok((buffer.read(cx)).text_snapshot())
5977        }
5978    }
5979
5980    fn language_server_for_buffer(
5981        &self,
5982        buffer: &Buffer,
5983        cx: &AppContext,
5984    ) -> Option<(&Arc<LspAdapter>, &Arc<LanguageServer>)> {
5985        if let Some((file, language)) = File::from_dyn(buffer.file()).zip(buffer.language()) {
5986            let name = language.lsp_adapter()?.name.clone();
5987            let worktree_id = file.worktree_id(cx);
5988            let key = (worktree_id, name);
5989
5990            if let Some(server_id) = self.language_server_ids.get(&key) {
5991                if let Some(LanguageServerState::Running { adapter, server }) =
5992                    self.language_servers.get(&server_id)
5993                {
5994                    return Some((adapter, server));
5995                }
5996            }
5997        }
5998
5999        None
6000    }
6001}
6002
6003impl ProjectStore {
6004    pub fn new(db: Arc<Db>) -> Self {
6005        Self {
6006            db,
6007            projects: Default::default(),
6008        }
6009    }
6010
6011    pub fn projects<'a>(
6012        &'a self,
6013        cx: &'a AppContext,
6014    ) -> impl 'a + Iterator<Item = ModelHandle<Project>> {
6015        self.projects
6016            .iter()
6017            .filter_map(|project| project.upgrade(cx))
6018    }
6019
6020    fn add_project(&mut self, project: WeakModelHandle<Project>, cx: &mut ModelContext<Self>) {
6021        if let Err(ix) = self
6022            .projects
6023            .binary_search_by_key(&project.id(), WeakModelHandle::id)
6024        {
6025            self.projects.insert(ix, project);
6026        }
6027        cx.notify();
6028    }
6029
6030    fn prune_projects(&mut self, cx: &mut ModelContext<Self>) {
6031        let mut did_change = false;
6032        self.projects.retain(|project| {
6033            if project.is_upgradable(cx) {
6034                true
6035            } else {
6036                did_change = true;
6037                false
6038            }
6039        });
6040        if did_change {
6041            cx.notify();
6042        }
6043    }
6044}
6045
6046impl WorktreeHandle {
6047    pub fn upgrade(&self, cx: &AppContext) -> Option<ModelHandle<Worktree>> {
6048        match self {
6049            WorktreeHandle::Strong(handle) => Some(handle.clone()),
6050            WorktreeHandle::Weak(handle) => handle.upgrade(cx),
6051        }
6052    }
6053}
6054
6055impl OpenBuffer {
6056    pub fn upgrade(&self, cx: &impl UpgradeModelHandle) -> Option<ModelHandle<Buffer>> {
6057        match self {
6058            OpenBuffer::Strong(handle) => Some(handle.clone()),
6059            OpenBuffer::Weak(handle) => handle.upgrade(cx),
6060            OpenBuffer::Loading(_) => None,
6061        }
6062    }
6063}
6064
6065struct CandidateSet {
6066    snapshot: Snapshot,
6067    include_ignored: bool,
6068    include_root_name: bool,
6069}
6070
6071impl<'a> PathMatchCandidateSet<'a> for CandidateSet {
6072    type Candidates = CandidateSetIter<'a>;
6073
6074    fn id(&self) -> usize {
6075        self.snapshot.id().to_usize()
6076    }
6077
6078    fn len(&self) -> usize {
6079        if self.include_ignored {
6080            self.snapshot.file_count()
6081        } else {
6082            self.snapshot.visible_file_count()
6083        }
6084    }
6085
6086    fn prefix(&self) -> Arc<str> {
6087        if self.snapshot.root_entry().map_or(false, |e| e.is_file()) {
6088            self.snapshot.root_name().into()
6089        } else if self.include_root_name {
6090            format!("{}/", self.snapshot.root_name()).into()
6091        } else {
6092            "".into()
6093        }
6094    }
6095
6096    fn candidates(&'a self, start: usize) -> Self::Candidates {
6097        CandidateSetIter {
6098            traversal: self.snapshot.files(self.include_ignored, start),
6099        }
6100    }
6101}
6102
6103struct CandidateSetIter<'a> {
6104    traversal: Traversal<'a>,
6105}
6106
6107impl<'a> Iterator for CandidateSetIter<'a> {
6108    type Item = PathMatchCandidate<'a>;
6109
6110    fn next(&mut self) -> Option<Self::Item> {
6111        self.traversal.next().map(|entry| {
6112            if let EntryKind::File(char_bag) = entry.kind {
6113                PathMatchCandidate {
6114                    path: &entry.path,
6115                    char_bag,
6116                }
6117            } else {
6118                unreachable!()
6119            }
6120        })
6121    }
6122}
6123
6124impl Entity for ProjectStore {
6125    type Event = ();
6126}
6127
6128impl Entity for Project {
6129    type Event = Event;
6130
6131    fn release(&mut self, cx: &mut gpui::MutableAppContext) {
6132        self.project_store.update(cx, ProjectStore::prune_projects);
6133
6134        match &self.client_state {
6135            ProjectClientState::Local { remote_id_rx, .. } => {
6136                if let Some(project_id) = *remote_id_rx.borrow() {
6137                    self.client
6138                        .send(proto::UnregisterProject { project_id })
6139                        .log_err();
6140                }
6141            }
6142            ProjectClientState::Remote { remote_id, .. } => {
6143                self.client
6144                    .send(proto::LeaveProject {
6145                        project_id: *remote_id,
6146                    })
6147                    .log_err();
6148            }
6149        }
6150    }
6151
6152    fn app_will_quit(
6153        &mut self,
6154        _: &mut MutableAppContext,
6155    ) -> Option<std::pin::Pin<Box<dyn 'static + Future<Output = ()>>>> {
6156        let shutdown_futures = self
6157            .language_servers
6158            .drain()
6159            .map(|(_, server_state)| async {
6160                match server_state {
6161                    LanguageServerState::Running { server, .. } => server.shutdown()?.await,
6162                    LanguageServerState::Starting(starting_server) => {
6163                        starting_server.await?.shutdown()?.await
6164                    }
6165                }
6166            })
6167            .collect::<Vec<_>>();
6168
6169        Some(
6170            async move {
6171                futures::future::join_all(shutdown_futures).await;
6172            }
6173            .boxed(),
6174        )
6175    }
6176}
6177
6178impl Collaborator {
6179    fn from_proto(
6180        message: proto::Collaborator,
6181        user_store: &ModelHandle<UserStore>,
6182        cx: &mut AsyncAppContext,
6183    ) -> impl Future<Output = Result<Self>> {
6184        let user = user_store.update(cx, |user_store, cx| {
6185            user_store.fetch_user(message.user_id, cx)
6186        });
6187
6188        async move {
6189            Ok(Self {
6190                peer_id: PeerId(message.peer_id),
6191                user: user.await?,
6192                replica_id: message.replica_id as ReplicaId,
6193            })
6194        }
6195    }
6196}
6197
6198impl<P: AsRef<Path>> From<(WorktreeId, P)> for ProjectPath {
6199    fn from((worktree_id, path): (WorktreeId, P)) -> Self {
6200        Self {
6201            worktree_id,
6202            path: path.as_ref().into(),
6203        }
6204    }
6205}
6206
6207impl From<lsp::CreateFileOptions> for fs::CreateOptions {
6208    fn from(options: lsp::CreateFileOptions) -> Self {
6209        Self {
6210            overwrite: options.overwrite.unwrap_or(false),
6211            ignore_if_exists: options.ignore_if_exists.unwrap_or(false),
6212        }
6213    }
6214}
6215
6216impl From<lsp::RenameFileOptions> for fs::RenameOptions {
6217    fn from(options: lsp::RenameFileOptions) -> Self {
6218        Self {
6219            overwrite: options.overwrite.unwrap_or(false),
6220            ignore_if_exists: options.ignore_if_exists.unwrap_or(false),
6221        }
6222    }
6223}
6224
6225impl From<lsp::DeleteFileOptions> for fs::RemoveOptions {
6226    fn from(options: lsp::DeleteFileOptions) -> Self {
6227        Self {
6228            recursive: options.recursive.unwrap_or(false),
6229            ignore_if_not_exists: options.ignore_if_not_exists.unwrap_or(false),
6230        }
6231    }
6232}
6233
6234fn serialize_symbol(symbol: &Symbol) -> proto::Symbol {
6235    proto::Symbol {
6236        source_worktree_id: symbol.source_worktree_id.to_proto(),
6237        worktree_id: symbol.worktree_id.to_proto(),
6238        language_server_name: symbol.language_server_name.0.to_string(),
6239        name: symbol.name.clone(),
6240        kind: unsafe { mem::transmute(symbol.kind) },
6241        path: symbol.path.to_string_lossy().to_string(),
6242        start: Some(proto::Point {
6243            row: symbol.range.start.row,
6244            column: symbol.range.start.column,
6245        }),
6246        end: Some(proto::Point {
6247            row: symbol.range.end.row,
6248            column: symbol.range.end.column,
6249        }),
6250        signature: symbol.signature.to_vec(),
6251    }
6252}
6253
6254fn relativize_path(base: &Path, path: &Path) -> PathBuf {
6255    let mut path_components = path.components();
6256    let mut base_components = base.components();
6257    let mut components: Vec<Component> = Vec::new();
6258    loop {
6259        match (path_components.next(), base_components.next()) {
6260            (None, None) => break,
6261            (Some(a), None) => {
6262                components.push(a);
6263                components.extend(path_components.by_ref());
6264                break;
6265            }
6266            (None, _) => components.push(Component::ParentDir),
6267            (Some(a), Some(b)) if components.is_empty() && a == b => (),
6268            (Some(a), Some(b)) if b == Component::CurDir => components.push(a),
6269            (Some(a), Some(_)) => {
6270                components.push(Component::ParentDir);
6271                for _ in base_components {
6272                    components.push(Component::ParentDir);
6273                }
6274                components.push(a);
6275                components.extend(path_components.by_ref());
6276                break;
6277            }
6278        }
6279    }
6280    components.iter().map(|c| c.as_os_str()).collect()
6281}
6282
6283impl Item for Buffer {
6284    fn entry_id(&self, cx: &AppContext) -> Option<ProjectEntryId> {
6285        File::from_dyn(self.file()).and_then(|file| file.project_entry_id(cx))
6286    }
6287}