1mod ignore;
   2mod lsp_command;
   3pub mod project_settings;
   4pub mod search;
   5pub mod terminals;
   6pub mod worktree;
   7
   8#[cfg(test)]
   9mod project_tests;
  10
  11use anyhow::{anyhow, Context, Result};
  12use client::{proto, Client, TypedEnvelope, UserStore};
  13use clock::ReplicaId;
  14use collections::{hash_map, BTreeMap, HashMap, HashSet};
  15use copilot::Copilot;
  16use futures::{
  17    channel::{
  18        mpsc::{self, UnboundedReceiver},
  19        oneshot,
  20    },
  21    future::{try_join_all, Shared},
  22    stream::FuturesUnordered,
  23    AsyncWriteExt, Future, FutureExt, StreamExt, TryFutureExt,
  24};
  25use globset::{Glob, GlobSet, GlobSetBuilder};
  26use gpui::{
  27    AnyModelHandle, AppContext, AsyncAppContext, BorrowAppContext, Entity, ModelContext,
  28    ModelHandle, Task, WeakModelHandle,
  29};
  30use language::{
  31    language_settings::{language_settings, FormatOnSave, Formatter},
  32    point_to_lsp,
  33    proto::{
  34        deserialize_anchor, deserialize_fingerprint, deserialize_line_ending, deserialize_version,
  35        serialize_anchor, serialize_version,
  36    },
  37    range_from_lsp, range_to_lsp, Anchor, Bias, Buffer, CachedLspAdapter, CodeAction, CodeLabel,
  38    Completion, Diagnostic, DiagnosticEntry, DiagnosticSet, Diff, Event as BufferEvent, File as _,
  39    Language, LanguageRegistry, LanguageServerName, LocalFile, OffsetRangeExt, Operation, Patch,
  40    PendingLanguageServer, PointUtf16, RopeFingerprint, TextBufferSnapshot, ToOffset, ToPointUtf16,
  41    Transaction, Unclipped,
  42};
  43use lsp::{
  44    DiagnosticSeverity, DiagnosticTag, DidChangeWatchedFilesRegistrationOptions,
  45    DocumentHighlightKind, LanguageServer, LanguageServerId,
  46};
  47use lsp_command::*;
  48use postage::watch;
  49use project_settings::ProjectSettings;
  50use rand::prelude::*;
  51use search::SearchQuery;
  52use serde::Serialize;
  53use settings::SettingsStore;
  54use sha2::{Digest, Sha256};
  55use similar::{ChangeTag, TextDiff};
  56use std::{
  57    cell::RefCell,
  58    cmp::{self, Ordering},
  59    convert::TryInto,
  60    hash::Hash,
  61    mem,
  62    num::NonZeroU32,
  63    ops::Range,
  64    path::{Component, Path, PathBuf},
  65    rc::Rc,
  66    str,
  67    sync::{
  68        atomic::{AtomicUsize, Ordering::SeqCst},
  69        Arc,
  70    },
  71    time::{Duration, Instant, SystemTime},
  72};
  73use terminals::Terminals;
  74use util::{
  75    debug_panic, defer, merge_json_value_into, paths::LOCAL_SETTINGS_RELATIVE_PATH, post_inc,
  76    ResultExt, TryFutureExt as _,
  77};
  78
  79pub use fs::*;
  80pub use worktree::*;
  81
  82pub trait Item {
  83    fn entry_id(&self, cx: &AppContext) -> Option<ProjectEntryId>;
  84    fn project_path(&self, cx: &AppContext) -> Option<ProjectPath>;
  85}
  86
  87// Language server state is stored across 3 collections:
  88//     language_servers =>
  89//         a mapping from unique server id to LanguageServerState which can either be a task for a
  90//         server in the process of starting, or a running server with adapter and language server arcs
  91//     language_server_ids => a mapping from worktreeId and server name to the unique server id
  92//     language_server_statuses => a mapping from unique server id to the current server status
  93//
  94// Multiple worktrees can map to the same language server for example when you jump to the definition
  95// of a file in the standard library. So language_server_ids is used to look up which server is active
  96// for a given worktree and language server name
  97//
  98// When starting a language server, first the id map is checked to make sure a server isn't already available
  99// for that worktree. If there is one, it finishes early. Otherwise, a new id is allocated and and
 100// the Starting variant of LanguageServerState is stored in the language_servers map.
 101pub struct Project {
 102    worktrees: Vec<WorktreeHandle>,
 103    active_entry: Option<ProjectEntryId>,
 104    buffer_ordered_messages_tx: mpsc::UnboundedSender<BufferOrderedMessage>,
 105    languages: Arc<LanguageRegistry>,
 106    language_servers: HashMap<LanguageServerId, LanguageServerState>,
 107    language_server_ids: HashMap<(WorktreeId, LanguageServerName), LanguageServerId>,
 108    language_server_statuses: BTreeMap<LanguageServerId, LanguageServerStatus>,
 109    last_workspace_edits_by_language_server: HashMap<LanguageServerId, ProjectTransaction>,
 110    client: Arc<client::Client>,
 111    next_entry_id: Arc<AtomicUsize>,
 112    join_project_response_message_id: u32,
 113    next_diagnostic_group_id: usize,
 114    user_store: ModelHandle<UserStore>,
 115    fs: Arc<dyn Fs>,
 116    client_state: Option<ProjectClientState>,
 117    collaborators: HashMap<proto::PeerId, Collaborator>,
 118    client_subscriptions: Vec<client::Subscription>,
 119    _subscriptions: Vec<gpui::Subscription>,
 120    next_buffer_id: u64,
 121    opened_buffer: (watch::Sender<()>, watch::Receiver<()>),
 122    shared_buffers: HashMap<proto::PeerId, HashSet<u64>>,
 123    #[allow(clippy::type_complexity)]
 124    loading_buffers_by_path: HashMap<
 125        ProjectPath,
 126        postage::watch::Receiver<Option<Result<ModelHandle<Buffer>, Arc<anyhow::Error>>>>,
 127    >,
 128    #[allow(clippy::type_complexity)]
 129    loading_local_worktrees:
 130        HashMap<Arc<Path>, Shared<Task<Result<ModelHandle<Worktree>, Arc<anyhow::Error>>>>>,
 131    opened_buffers: HashMap<u64, OpenBuffer>,
 132    local_buffer_ids_by_path: HashMap<ProjectPath, u64>,
 133    local_buffer_ids_by_entry_id: HashMap<ProjectEntryId, u64>,
 134    /// A mapping from a buffer ID to None means that we've started waiting for an ID but haven't finished loading it.
 135    /// Used for re-issuing buffer requests when peers temporarily disconnect
 136    incomplete_remote_buffers: HashMap<u64, Option<ModelHandle<Buffer>>>,
 137    buffer_snapshots: HashMap<u64, HashMap<LanguageServerId, Vec<LspBufferSnapshot>>>, // buffer_id -> server_id -> vec of snapshots
 138    buffers_being_formatted: HashSet<u64>,
 139    buffers_needing_diff: HashSet<WeakModelHandle<Buffer>>,
 140    git_diff_debouncer: DelayedDebounced,
 141    nonce: u128,
 142    _maintain_buffer_languages: Task<()>,
 143    _maintain_workspace_config: Task<()>,
 144    terminals: Terminals,
 145    copilot_enabled: bool,
 146}
 147
 148struct DelayedDebounced {
 149    task: Option<Task<()>>,
 150    cancel_channel: Option<oneshot::Sender<()>>,
 151}
 152
 153impl DelayedDebounced {
 154    fn new() -> DelayedDebounced {
 155        DelayedDebounced {
 156            task: None,
 157            cancel_channel: None,
 158        }
 159    }
 160
 161    fn fire_new<F>(&mut self, delay: Duration, cx: &mut ModelContext<Project>, func: F)
 162    where
 163        F: 'static + FnOnce(&mut Project, &mut ModelContext<Project>) -> Task<()>,
 164    {
 165        if let Some(channel) = self.cancel_channel.take() {
 166            _ = channel.send(());
 167        }
 168
 169        let (sender, mut receiver) = oneshot::channel::<()>();
 170        self.cancel_channel = Some(sender);
 171
 172        let previous_task = self.task.take();
 173        self.task = Some(cx.spawn(|workspace, mut cx| async move {
 174            let mut timer = cx.background().timer(delay).fuse();
 175            if let Some(previous_task) = previous_task {
 176                previous_task.await;
 177            }
 178
 179            futures::select_biased! {
 180                _ = receiver => return,
 181                    _ = timer => {}
 182            }
 183
 184            workspace
 185                .update(&mut cx, |workspace, cx| (func)(workspace, cx))
 186                .await;
 187        }));
 188    }
 189}
 190
 191struct LspBufferSnapshot {
 192    version: i32,
 193    snapshot: TextBufferSnapshot,
 194}
 195
 196/// Message ordered with respect to buffer operations
 197enum BufferOrderedMessage {
 198    Operation {
 199        buffer_id: u64,
 200        operation: proto::Operation,
 201    },
 202    LanguageServerUpdate {
 203        language_server_id: LanguageServerId,
 204        message: proto::update_language_server::Variant,
 205    },
 206    Resync,
 207}
 208
 209enum LocalProjectUpdate {
 210    WorktreesChanged,
 211    CreateBufferForPeer {
 212        peer_id: proto::PeerId,
 213        buffer_id: u64,
 214    },
 215}
 216
 217enum OpenBuffer {
 218    Strong(ModelHandle<Buffer>),
 219    Weak(WeakModelHandle<Buffer>),
 220    Operations(Vec<Operation>),
 221}
 222
 223enum WorktreeHandle {
 224    Strong(ModelHandle<Worktree>),
 225    Weak(WeakModelHandle<Worktree>),
 226}
 227
 228enum ProjectClientState {
 229    Local {
 230        remote_id: u64,
 231        updates_tx: mpsc::UnboundedSender<LocalProjectUpdate>,
 232        _send_updates: Task<()>,
 233    },
 234    Remote {
 235        sharing_has_stopped: bool,
 236        remote_id: u64,
 237        replica_id: ReplicaId,
 238    },
 239}
 240
 241#[derive(Clone, Debug)]
 242pub struct Collaborator {
 243    pub peer_id: proto::PeerId,
 244    pub replica_id: ReplicaId,
 245}
 246
 247#[derive(Clone, Debug, PartialEq, Eq)]
 248pub enum Event {
 249    LanguageServerAdded(LanguageServerId),
 250    LanguageServerRemoved(LanguageServerId),
 251    ActiveEntryChanged(Option<ProjectEntryId>),
 252    WorktreeAdded,
 253    WorktreeRemoved(WorktreeId),
 254    DiskBasedDiagnosticsStarted {
 255        language_server_id: LanguageServerId,
 256    },
 257    DiskBasedDiagnosticsFinished {
 258        language_server_id: LanguageServerId,
 259    },
 260    DiagnosticsUpdated {
 261        path: ProjectPath,
 262        language_server_id: LanguageServerId,
 263    },
 264    RemoteIdChanged(Option<u64>),
 265    DisconnectedFromHost,
 266    Closed,
 267    DeletedEntry(ProjectEntryId),
 268    CollaboratorUpdated {
 269        old_peer_id: proto::PeerId,
 270        new_peer_id: proto::PeerId,
 271    },
 272    CollaboratorLeft(proto::PeerId),
 273}
 274
 275pub enum LanguageServerState {
 276    Starting(Task<Option<Arc<LanguageServer>>>),
 277    Running {
 278        language: Arc<Language>,
 279        adapter: Arc<CachedLspAdapter>,
 280        server: Arc<LanguageServer>,
 281        watched_paths: HashMap<WorktreeId, GlobSet>,
 282        simulate_disk_based_diagnostics_completion: Option<Task<()>>,
 283    },
 284}
 285
 286#[derive(Serialize)]
 287pub struct LanguageServerStatus {
 288    pub name: String,
 289    pub pending_work: BTreeMap<String, LanguageServerProgress>,
 290    pub has_pending_diagnostic_updates: bool,
 291    progress_tokens: HashSet<String>,
 292}
 293
 294#[derive(Clone, Debug, Serialize)]
 295pub struct LanguageServerProgress {
 296    pub message: Option<String>,
 297    pub percentage: Option<usize>,
 298    #[serde(skip_serializing)]
 299    pub last_update_at: Instant,
 300}
 301
 302#[derive(Clone, Debug, Eq, PartialEq, Hash, PartialOrd, Ord)]
 303pub struct ProjectPath {
 304    pub worktree_id: WorktreeId,
 305    pub path: Arc<Path>,
 306}
 307
 308#[derive(Copy, Clone, Debug, Default, PartialEq, Serialize)]
 309pub struct DiagnosticSummary {
 310    pub error_count: usize,
 311    pub warning_count: usize,
 312}
 313
 314#[derive(Debug, Clone)]
 315pub struct Location {
 316    pub buffer: ModelHandle<Buffer>,
 317    pub range: Range<language::Anchor>,
 318}
 319
 320#[derive(Debug, Clone)]
 321pub struct LocationLink {
 322    pub origin: Option<Location>,
 323    pub target: Location,
 324}
 325
 326#[derive(Debug)]
 327pub struct DocumentHighlight {
 328    pub range: Range<language::Anchor>,
 329    pub kind: DocumentHighlightKind,
 330}
 331
 332#[derive(Clone, Debug)]
 333pub struct Symbol {
 334    pub language_server_name: LanguageServerName,
 335    pub source_worktree_id: WorktreeId,
 336    pub path: ProjectPath,
 337    pub label: CodeLabel,
 338    pub name: String,
 339    pub kind: lsp::SymbolKind,
 340    pub range: Range<Unclipped<PointUtf16>>,
 341    pub signature: [u8; 32],
 342}
 343
 344#[derive(Clone, Debug, PartialEq)]
 345pub struct HoverBlock {
 346    pub text: String,
 347    pub kind: HoverBlockKind,
 348}
 349
 350#[derive(Clone, Debug, PartialEq)]
 351pub enum HoverBlockKind {
 352    PlainText,
 353    Markdown,
 354    Code { language: String },
 355}
 356
 357#[derive(Debug)]
 358pub struct Hover {
 359    pub contents: Vec<HoverBlock>,
 360    pub range: Option<Range<language::Anchor>>,
 361}
 362
 363#[derive(Default)]
 364pub struct ProjectTransaction(pub HashMap<ModelHandle<Buffer>, language::Transaction>);
 365
 366impl DiagnosticSummary {
 367    fn new<'a, T: 'a>(diagnostics: impl IntoIterator<Item = &'a DiagnosticEntry<T>>) -> Self {
 368        let mut this = Self {
 369            error_count: 0,
 370            warning_count: 0,
 371        };
 372
 373        for entry in diagnostics {
 374            if entry.diagnostic.is_primary {
 375                match entry.diagnostic.severity {
 376                    DiagnosticSeverity::ERROR => this.error_count += 1,
 377                    DiagnosticSeverity::WARNING => this.warning_count += 1,
 378                    _ => {}
 379                }
 380            }
 381        }
 382
 383        this
 384    }
 385
 386    pub fn is_empty(&self) -> bool {
 387        self.error_count == 0 && self.warning_count == 0
 388    }
 389
 390    pub fn to_proto(
 391        &self,
 392        language_server_id: LanguageServerId,
 393        path: &Path,
 394    ) -> proto::DiagnosticSummary {
 395        proto::DiagnosticSummary {
 396            path: path.to_string_lossy().to_string(),
 397            language_server_id: language_server_id.0 as u64,
 398            error_count: self.error_count as u32,
 399            warning_count: self.warning_count as u32,
 400        }
 401    }
 402}
 403
 404#[derive(Clone, Copy, Debug, Default, Hash, PartialEq, Eq, PartialOrd, Ord)]
 405pub struct ProjectEntryId(usize);
 406
 407impl ProjectEntryId {
 408    pub const MAX: Self = Self(usize::MAX);
 409
 410    pub fn new(counter: &AtomicUsize) -> Self {
 411        Self(counter.fetch_add(1, SeqCst))
 412    }
 413
 414    pub fn from_proto(id: u64) -> Self {
 415        Self(id as usize)
 416    }
 417
 418    pub fn to_proto(&self) -> u64 {
 419        self.0 as u64
 420    }
 421
 422    pub fn to_usize(&self) -> usize {
 423        self.0
 424    }
 425}
 426
 427#[derive(Debug, Clone, Copy, PartialEq, Eq)]
 428pub enum FormatTrigger {
 429    Save,
 430    Manual,
 431}
 432
 433impl FormatTrigger {
 434    fn from_proto(value: i32) -> FormatTrigger {
 435        match value {
 436            0 => FormatTrigger::Save,
 437            1 => FormatTrigger::Manual,
 438            _ => FormatTrigger::Save,
 439        }
 440    }
 441}
 442
 443impl Project {
 444    pub fn init_settings(cx: &mut AppContext) {
 445        settings::register::<ProjectSettings>(cx);
 446    }
 447
 448    pub fn init(client: &Arc<Client>, cx: &mut AppContext) {
 449        Self::init_settings(cx);
 450
 451        client.add_model_message_handler(Self::handle_add_collaborator);
 452        client.add_model_message_handler(Self::handle_update_project_collaborator);
 453        client.add_model_message_handler(Self::handle_remove_collaborator);
 454        client.add_model_message_handler(Self::handle_buffer_reloaded);
 455        client.add_model_message_handler(Self::handle_buffer_saved);
 456        client.add_model_message_handler(Self::handle_start_language_server);
 457        client.add_model_message_handler(Self::handle_update_language_server);
 458        client.add_model_message_handler(Self::handle_update_project);
 459        client.add_model_message_handler(Self::handle_unshare_project);
 460        client.add_model_message_handler(Self::handle_create_buffer_for_peer);
 461        client.add_model_message_handler(Self::handle_update_buffer_file);
 462        client.add_model_request_handler(Self::handle_update_buffer);
 463        client.add_model_message_handler(Self::handle_update_diagnostic_summary);
 464        client.add_model_message_handler(Self::handle_update_worktree);
 465        client.add_model_message_handler(Self::handle_update_worktree_settings);
 466        client.add_model_request_handler(Self::handle_create_project_entry);
 467        client.add_model_request_handler(Self::handle_rename_project_entry);
 468        client.add_model_request_handler(Self::handle_copy_project_entry);
 469        client.add_model_request_handler(Self::handle_delete_project_entry);
 470        client.add_model_request_handler(Self::handle_apply_additional_edits_for_completion);
 471        client.add_model_request_handler(Self::handle_apply_code_action);
 472        client.add_model_request_handler(Self::handle_on_type_formatting);
 473        client.add_model_request_handler(Self::handle_reload_buffers);
 474        client.add_model_request_handler(Self::handle_synchronize_buffers);
 475        client.add_model_request_handler(Self::handle_format_buffers);
 476        client.add_model_request_handler(Self::handle_lsp_command::<GetCodeActions>);
 477        client.add_model_request_handler(Self::handle_lsp_command::<GetCompletions>);
 478        client.add_model_request_handler(Self::handle_lsp_command::<GetHover>);
 479        client.add_model_request_handler(Self::handle_lsp_command::<GetDefinition>);
 480        client.add_model_request_handler(Self::handle_lsp_command::<GetTypeDefinition>);
 481        client.add_model_request_handler(Self::handle_lsp_command::<GetDocumentHighlights>);
 482        client.add_model_request_handler(Self::handle_lsp_command::<GetReferences>);
 483        client.add_model_request_handler(Self::handle_lsp_command::<PrepareRename>);
 484        client.add_model_request_handler(Self::handle_lsp_command::<PerformRename>);
 485        client.add_model_request_handler(Self::handle_search_project);
 486        client.add_model_request_handler(Self::handle_get_project_symbols);
 487        client.add_model_request_handler(Self::handle_open_buffer_for_symbol);
 488        client.add_model_request_handler(Self::handle_open_buffer_by_id);
 489        client.add_model_request_handler(Self::handle_open_buffer_by_path);
 490        client.add_model_request_handler(Self::handle_save_buffer);
 491        client.add_model_message_handler(Self::handle_update_diff_base);
 492    }
 493
 494    pub fn local(
 495        client: Arc<Client>,
 496        user_store: ModelHandle<UserStore>,
 497        languages: Arc<LanguageRegistry>,
 498        fs: Arc<dyn Fs>,
 499        cx: &mut AppContext,
 500    ) -> ModelHandle<Self> {
 501        cx.add_model(|cx: &mut ModelContext<Self>| {
 502            let (tx, rx) = mpsc::unbounded();
 503            cx.spawn_weak(|this, cx| Self::send_buffer_ordered_messages(this, rx, cx))
 504                .detach();
 505            Self {
 506                worktrees: Default::default(),
 507                buffer_ordered_messages_tx: tx,
 508                collaborators: Default::default(),
 509                next_buffer_id: 0,
 510                opened_buffers: Default::default(),
 511                shared_buffers: Default::default(),
 512                incomplete_remote_buffers: Default::default(),
 513                loading_buffers_by_path: Default::default(),
 514                loading_local_worktrees: Default::default(),
 515                local_buffer_ids_by_path: Default::default(),
 516                local_buffer_ids_by_entry_id: Default::default(),
 517                buffer_snapshots: Default::default(),
 518                join_project_response_message_id: 0,
 519                client_state: None,
 520                opened_buffer: watch::channel(),
 521                client_subscriptions: Vec::new(),
 522                _subscriptions: vec![
 523                    cx.observe_global::<SettingsStore, _>(Self::on_settings_changed)
 524                ],
 525                _maintain_buffer_languages: Self::maintain_buffer_languages(&languages, cx),
 526                _maintain_workspace_config: Self::maintain_workspace_config(languages.clone(), cx),
 527                active_entry: None,
 528                languages,
 529                client,
 530                user_store,
 531                fs,
 532                next_entry_id: Default::default(),
 533                next_diagnostic_group_id: Default::default(),
 534                language_servers: Default::default(),
 535                language_server_ids: Default::default(),
 536                language_server_statuses: Default::default(),
 537                last_workspace_edits_by_language_server: Default::default(),
 538                buffers_being_formatted: Default::default(),
 539                buffers_needing_diff: Default::default(),
 540                git_diff_debouncer: DelayedDebounced::new(),
 541                nonce: StdRng::from_entropy().gen(),
 542                terminals: Terminals {
 543                    local_handles: Vec::new(),
 544                },
 545                copilot_enabled: Copilot::global(cx).is_some(),
 546            }
 547        })
 548    }
 549
 550    pub async fn remote(
 551        remote_id: u64,
 552        client: Arc<Client>,
 553        user_store: ModelHandle<UserStore>,
 554        languages: Arc<LanguageRegistry>,
 555        fs: Arc<dyn Fs>,
 556        mut cx: AsyncAppContext,
 557    ) -> Result<ModelHandle<Self>> {
 558        client.authenticate_and_connect(true, &cx).await?;
 559
 560        let subscription = client.subscribe_to_entity(remote_id)?;
 561        let response = client
 562            .request_envelope(proto::JoinProject {
 563                project_id: remote_id,
 564            })
 565            .await?;
 566        let this = cx.add_model(|cx| {
 567            let replica_id = response.payload.replica_id as ReplicaId;
 568
 569            let mut worktrees = Vec::new();
 570            for worktree in response.payload.worktrees {
 571                let worktree = cx.update(|cx| {
 572                    Worktree::remote(remote_id, replica_id, worktree, client.clone(), cx)
 573                });
 574                worktrees.push(worktree);
 575            }
 576
 577            let (tx, rx) = mpsc::unbounded();
 578            cx.spawn_weak(|this, cx| Self::send_buffer_ordered_messages(this, rx, cx))
 579                .detach();
 580            let mut this = Self {
 581                worktrees: Vec::new(),
 582                buffer_ordered_messages_tx: tx,
 583                loading_buffers_by_path: Default::default(),
 584                next_buffer_id: 0,
 585                opened_buffer: watch::channel(),
 586                shared_buffers: Default::default(),
 587                incomplete_remote_buffers: Default::default(),
 588                loading_local_worktrees: Default::default(),
 589                local_buffer_ids_by_path: Default::default(),
 590                local_buffer_ids_by_entry_id: Default::default(),
 591                active_entry: None,
 592                collaborators: Default::default(),
 593                join_project_response_message_id: response.message_id,
 594                _maintain_buffer_languages: Self::maintain_buffer_languages(&languages, cx),
 595                _maintain_workspace_config: Self::maintain_workspace_config(languages.clone(), cx),
 596                languages,
 597                user_store: user_store.clone(),
 598                fs,
 599                next_entry_id: Default::default(),
 600                next_diagnostic_group_id: Default::default(),
 601                client_subscriptions: Default::default(),
 602                _subscriptions: Default::default(),
 603                client: client.clone(),
 604                client_state: Some(ProjectClientState::Remote {
 605                    sharing_has_stopped: false,
 606                    remote_id,
 607                    replica_id,
 608                }),
 609                language_servers: Default::default(),
 610                language_server_ids: Default::default(),
 611                language_server_statuses: response
 612                    .payload
 613                    .language_servers
 614                    .into_iter()
 615                    .map(|server| {
 616                        (
 617                            LanguageServerId(server.id as usize),
 618                            LanguageServerStatus {
 619                                name: server.name,
 620                                pending_work: Default::default(),
 621                                has_pending_diagnostic_updates: false,
 622                                progress_tokens: Default::default(),
 623                            },
 624                        )
 625                    })
 626                    .collect(),
 627                last_workspace_edits_by_language_server: Default::default(),
 628                opened_buffers: Default::default(),
 629                buffers_being_formatted: Default::default(),
 630                buffers_needing_diff: Default::default(),
 631                git_diff_debouncer: DelayedDebounced::new(),
 632                buffer_snapshots: Default::default(),
 633                nonce: StdRng::from_entropy().gen(),
 634                terminals: Terminals {
 635                    local_handles: Vec::new(),
 636                },
 637                copilot_enabled: Copilot::global(cx).is_some(),
 638            };
 639            for worktree in worktrees {
 640                let _ = this.add_worktree(&worktree, cx);
 641            }
 642            this
 643        });
 644        let subscription = subscription.set_model(&this, &mut cx);
 645
 646        let user_ids = response
 647            .payload
 648            .collaborators
 649            .iter()
 650            .map(|peer| peer.user_id)
 651            .collect();
 652        user_store
 653            .update(&mut cx, |user_store, cx| user_store.get_users(user_ids, cx))
 654            .await?;
 655
 656        this.update(&mut cx, |this, cx| {
 657            this.set_collaborators_from_proto(response.payload.collaborators, cx)?;
 658            this.client_subscriptions.push(subscription);
 659            anyhow::Ok(())
 660        })?;
 661
 662        Ok(this)
 663    }
 664
 665    #[cfg(any(test, feature = "test-support"))]
 666    pub async fn test(
 667        fs: Arc<dyn Fs>,
 668        root_paths: impl IntoIterator<Item = &Path>,
 669        cx: &mut gpui::TestAppContext,
 670    ) -> ModelHandle<Project> {
 671        let mut languages = LanguageRegistry::test();
 672        languages.set_executor(cx.background());
 673        let http_client = util::http::FakeHttpClient::with_404_response();
 674        let client = cx.update(|cx| client::Client::new(http_client.clone(), cx));
 675        let user_store = cx.add_model(|cx| UserStore::new(client.clone(), http_client, cx));
 676        let project =
 677            cx.update(|cx| Project::local(client, user_store, Arc::new(languages), fs, cx));
 678        for path in root_paths {
 679            let (tree, _) = project
 680                .update(cx, |project, cx| {
 681                    project.find_or_create_local_worktree(path, true, cx)
 682                })
 683                .await
 684                .unwrap();
 685            tree.read_with(cx, |tree, _| tree.as_local().unwrap().scan_complete())
 686                .await;
 687        }
 688        project
 689    }
 690
 691    fn on_settings_changed(&mut self, cx: &mut ModelContext<Self>) {
 692        let mut language_servers_to_start = Vec::new();
 693        for buffer in self.opened_buffers.values() {
 694            if let Some(buffer) = buffer.upgrade(cx) {
 695                let buffer = buffer.read(cx);
 696                if let Some((file, language)) = buffer.file().zip(buffer.language()) {
 697                    let settings = language_settings(Some(language), Some(file), cx);
 698                    if settings.enable_language_server {
 699                        if let Some(file) = File::from_dyn(Some(file)) {
 700                            language_servers_to_start
 701                                .push((file.worktree.clone(), language.clone()));
 702                        }
 703                    }
 704                }
 705            }
 706        }
 707
 708        let mut language_servers_to_stop = Vec::new();
 709        let languages = self.languages.to_vec();
 710        for (worktree_id, started_lsp_name) in self.language_server_ids.keys() {
 711            let language = languages.iter().find(|l| {
 712                l.lsp_adapters()
 713                    .iter()
 714                    .any(|adapter| &adapter.name == started_lsp_name)
 715            });
 716            if let Some(language) = language {
 717                let worktree = self.worktree_for_id(*worktree_id, cx);
 718                let file = worktree.and_then(|tree| {
 719                    tree.update(cx, |tree, cx| tree.root_file(cx).map(|f| f as _))
 720                });
 721                if !language_settings(Some(language), file.as_ref(), cx).enable_language_server {
 722                    language_servers_to_stop.push((*worktree_id, started_lsp_name.clone()));
 723                }
 724            }
 725        }
 726
 727        // Stop all newly-disabled language servers.
 728        for (worktree_id, adapter_name) in language_servers_to_stop {
 729            self.stop_language_server(worktree_id, adapter_name, cx)
 730                .detach();
 731        }
 732
 733        // Start all the newly-enabled language servers.
 734        for (worktree, language) in language_servers_to_start {
 735            let worktree_path = worktree.read(cx).abs_path();
 736            self.start_language_servers(&worktree, worktree_path, language, cx);
 737        }
 738
 739        if !self.copilot_enabled && Copilot::global(cx).is_some() {
 740            self.copilot_enabled = true;
 741            for buffer in self.opened_buffers.values() {
 742                if let Some(buffer) = buffer.upgrade(cx) {
 743                    self.register_buffer_with_copilot(&buffer, cx);
 744                }
 745            }
 746        }
 747
 748        cx.notify();
 749    }
 750
 751    pub fn buffer_for_id(&self, remote_id: u64, cx: &AppContext) -> Option<ModelHandle<Buffer>> {
 752        self.opened_buffers
 753            .get(&remote_id)
 754            .and_then(|buffer| buffer.upgrade(cx))
 755    }
 756
 757    pub fn languages(&self) -> &Arc<LanguageRegistry> {
 758        &self.languages
 759    }
 760
 761    pub fn client(&self) -> Arc<Client> {
 762        self.client.clone()
 763    }
 764
 765    pub fn user_store(&self) -> ModelHandle<UserStore> {
 766        self.user_store.clone()
 767    }
 768
 769    #[cfg(any(test, feature = "test-support"))]
 770    pub fn opened_buffers(&self, cx: &AppContext) -> Vec<ModelHandle<Buffer>> {
 771        self.opened_buffers
 772            .values()
 773            .filter_map(|b| b.upgrade(cx))
 774            .collect()
 775    }
 776
 777    #[cfg(any(test, feature = "test-support"))]
 778    pub fn has_open_buffer(&self, path: impl Into<ProjectPath>, cx: &AppContext) -> bool {
 779        let path = path.into();
 780        if let Some(worktree) = self.worktree_for_id(path.worktree_id, cx) {
 781            self.opened_buffers.iter().any(|(_, buffer)| {
 782                if let Some(buffer) = buffer.upgrade(cx) {
 783                    if let Some(file) = File::from_dyn(buffer.read(cx).file()) {
 784                        if file.worktree == worktree && file.path() == &path.path {
 785                            return true;
 786                        }
 787                    }
 788                }
 789                false
 790            })
 791        } else {
 792            false
 793        }
 794    }
 795
 796    pub fn fs(&self) -> &Arc<dyn Fs> {
 797        &self.fs
 798    }
 799
 800    pub fn remote_id(&self) -> Option<u64> {
 801        match self.client_state.as_ref()? {
 802            ProjectClientState::Local { remote_id, .. }
 803            | ProjectClientState::Remote { remote_id, .. } => Some(*remote_id),
 804        }
 805    }
 806
 807    pub fn replica_id(&self) -> ReplicaId {
 808        match &self.client_state {
 809            Some(ProjectClientState::Remote { replica_id, .. }) => *replica_id,
 810            _ => 0,
 811        }
 812    }
 813
 814    fn metadata_changed(&mut self, cx: &mut ModelContext<Self>) {
 815        if let Some(ProjectClientState::Local { updates_tx, .. }) = &mut self.client_state {
 816            updates_tx
 817                .unbounded_send(LocalProjectUpdate::WorktreesChanged)
 818                .ok();
 819        }
 820        cx.notify();
 821    }
 822
 823    pub fn collaborators(&self) -> &HashMap<proto::PeerId, Collaborator> {
 824        &self.collaborators
 825    }
 826
 827    /// Collect all worktrees, including ones that don't appear in the project panel
 828    pub fn worktrees<'a>(
 829        &'a self,
 830        cx: &'a AppContext,
 831    ) -> impl 'a + DoubleEndedIterator<Item = ModelHandle<Worktree>> {
 832        self.worktrees
 833            .iter()
 834            .filter_map(move |worktree| worktree.upgrade(cx))
 835    }
 836
 837    /// Collect all user-visible worktrees, the ones that appear in the project panel
 838    pub fn visible_worktrees<'a>(
 839        &'a self,
 840        cx: &'a AppContext,
 841    ) -> impl 'a + DoubleEndedIterator<Item = ModelHandle<Worktree>> {
 842        self.worktrees.iter().filter_map(|worktree| {
 843            worktree.upgrade(cx).and_then(|worktree| {
 844                if worktree.read(cx).is_visible() {
 845                    Some(worktree)
 846                } else {
 847                    None
 848                }
 849            })
 850        })
 851    }
 852
 853    pub fn worktree_root_names<'a>(&'a self, cx: &'a AppContext) -> impl Iterator<Item = &'a str> {
 854        self.visible_worktrees(cx)
 855            .map(|tree| tree.read(cx).root_name())
 856    }
 857
 858    pub fn worktree_for_id(
 859        &self,
 860        id: WorktreeId,
 861        cx: &AppContext,
 862    ) -> Option<ModelHandle<Worktree>> {
 863        self.worktrees(cx)
 864            .find(|worktree| worktree.read(cx).id() == id)
 865    }
 866
 867    pub fn worktree_for_entry(
 868        &self,
 869        entry_id: ProjectEntryId,
 870        cx: &AppContext,
 871    ) -> Option<ModelHandle<Worktree>> {
 872        self.worktrees(cx)
 873            .find(|worktree| worktree.read(cx).contains_entry(entry_id))
 874    }
 875
 876    pub fn worktree_id_for_entry(
 877        &self,
 878        entry_id: ProjectEntryId,
 879        cx: &AppContext,
 880    ) -> Option<WorktreeId> {
 881        self.worktree_for_entry(entry_id, cx)
 882            .map(|worktree| worktree.read(cx).id())
 883    }
 884
 885    pub fn contains_paths(&self, paths: &[PathBuf], cx: &AppContext) -> bool {
 886        paths.iter().all(|path| self.contains_path(path, cx))
 887    }
 888
 889    pub fn contains_path(&self, path: &Path, cx: &AppContext) -> bool {
 890        for worktree in self.worktrees(cx) {
 891            let worktree = worktree.read(cx).as_local();
 892            if worktree.map_or(false, |w| w.contains_abs_path(path)) {
 893                return true;
 894            }
 895        }
 896        false
 897    }
 898
 899    pub fn create_entry(
 900        &mut self,
 901        project_path: impl Into<ProjectPath>,
 902        is_directory: bool,
 903        cx: &mut ModelContext<Self>,
 904    ) -> Option<Task<Result<Entry>>> {
 905        let project_path = project_path.into();
 906        let worktree = self.worktree_for_id(project_path.worktree_id, cx)?;
 907        if self.is_local() {
 908            Some(worktree.update(cx, |worktree, cx| {
 909                worktree
 910                    .as_local_mut()
 911                    .unwrap()
 912                    .create_entry(project_path.path, is_directory, cx)
 913            }))
 914        } else {
 915            let client = self.client.clone();
 916            let project_id = self.remote_id().unwrap();
 917            Some(cx.spawn_weak(|_, mut cx| async move {
 918                let response = client
 919                    .request(proto::CreateProjectEntry {
 920                        worktree_id: project_path.worktree_id.to_proto(),
 921                        project_id,
 922                        path: project_path.path.to_string_lossy().into(),
 923                        is_directory,
 924                    })
 925                    .await?;
 926                let entry = response
 927                    .entry
 928                    .ok_or_else(|| anyhow!("missing entry in response"))?;
 929                worktree
 930                    .update(&mut cx, |worktree, cx| {
 931                        worktree.as_remote_mut().unwrap().insert_entry(
 932                            entry,
 933                            response.worktree_scan_id as usize,
 934                            cx,
 935                        )
 936                    })
 937                    .await
 938            }))
 939        }
 940    }
 941
 942    pub fn copy_entry(
 943        &mut self,
 944        entry_id: ProjectEntryId,
 945        new_path: impl Into<Arc<Path>>,
 946        cx: &mut ModelContext<Self>,
 947    ) -> Option<Task<Result<Entry>>> {
 948        let worktree = self.worktree_for_entry(entry_id, cx)?;
 949        let new_path = new_path.into();
 950        if self.is_local() {
 951            worktree.update(cx, |worktree, cx| {
 952                worktree
 953                    .as_local_mut()
 954                    .unwrap()
 955                    .copy_entry(entry_id, new_path, cx)
 956            })
 957        } else {
 958            let client = self.client.clone();
 959            let project_id = self.remote_id().unwrap();
 960
 961            Some(cx.spawn_weak(|_, mut cx| async move {
 962                let response = client
 963                    .request(proto::CopyProjectEntry {
 964                        project_id,
 965                        entry_id: entry_id.to_proto(),
 966                        new_path: new_path.to_string_lossy().into(),
 967                    })
 968                    .await?;
 969                let entry = response
 970                    .entry
 971                    .ok_or_else(|| anyhow!("missing entry in response"))?;
 972                worktree
 973                    .update(&mut cx, |worktree, cx| {
 974                        worktree.as_remote_mut().unwrap().insert_entry(
 975                            entry,
 976                            response.worktree_scan_id as usize,
 977                            cx,
 978                        )
 979                    })
 980                    .await
 981            }))
 982        }
 983    }
 984
 985    pub fn rename_entry(
 986        &mut self,
 987        entry_id: ProjectEntryId,
 988        new_path: impl Into<Arc<Path>>,
 989        cx: &mut ModelContext<Self>,
 990    ) -> Option<Task<Result<Entry>>> {
 991        let worktree = self.worktree_for_entry(entry_id, cx)?;
 992        let new_path = new_path.into();
 993        if self.is_local() {
 994            worktree.update(cx, |worktree, cx| {
 995                worktree
 996                    .as_local_mut()
 997                    .unwrap()
 998                    .rename_entry(entry_id, new_path, cx)
 999            })
1000        } else {
1001            let client = self.client.clone();
1002            let project_id = self.remote_id().unwrap();
1003
1004            Some(cx.spawn_weak(|_, mut cx| async move {
1005                let response = client
1006                    .request(proto::RenameProjectEntry {
1007                        project_id,
1008                        entry_id: entry_id.to_proto(),
1009                        new_path: new_path.to_string_lossy().into(),
1010                    })
1011                    .await?;
1012                let entry = response
1013                    .entry
1014                    .ok_or_else(|| anyhow!("missing entry in response"))?;
1015                worktree
1016                    .update(&mut cx, |worktree, cx| {
1017                        worktree.as_remote_mut().unwrap().insert_entry(
1018                            entry,
1019                            response.worktree_scan_id as usize,
1020                            cx,
1021                        )
1022                    })
1023                    .await
1024            }))
1025        }
1026    }
1027
1028    pub fn delete_entry(
1029        &mut self,
1030        entry_id: ProjectEntryId,
1031        cx: &mut ModelContext<Self>,
1032    ) -> Option<Task<Result<()>>> {
1033        let worktree = self.worktree_for_entry(entry_id, cx)?;
1034
1035        cx.emit(Event::DeletedEntry(entry_id));
1036
1037        if self.is_local() {
1038            worktree.update(cx, |worktree, cx| {
1039                worktree.as_local_mut().unwrap().delete_entry(entry_id, cx)
1040            })
1041        } else {
1042            let client = self.client.clone();
1043            let project_id = self.remote_id().unwrap();
1044            Some(cx.spawn_weak(|_, mut cx| async move {
1045                let response = client
1046                    .request(proto::DeleteProjectEntry {
1047                        project_id,
1048                        entry_id: entry_id.to_proto(),
1049                    })
1050                    .await?;
1051                worktree
1052                    .update(&mut cx, move |worktree, cx| {
1053                        worktree.as_remote_mut().unwrap().delete_entry(
1054                            entry_id,
1055                            response.worktree_scan_id as usize,
1056                            cx,
1057                        )
1058                    })
1059                    .await
1060            }))
1061        }
1062    }
1063
1064    pub fn shared(&mut self, project_id: u64, cx: &mut ModelContext<Self>) -> Result<()> {
1065        if self.client_state.is_some() {
1066            return Err(anyhow!("project was already shared"));
1067        }
1068        self.client_subscriptions.push(
1069            self.client
1070                .subscribe_to_entity(project_id)?
1071                .set_model(&cx.handle(), &mut cx.to_async()),
1072        );
1073
1074        for open_buffer in self.opened_buffers.values_mut() {
1075            match open_buffer {
1076                OpenBuffer::Strong(_) => {}
1077                OpenBuffer::Weak(buffer) => {
1078                    if let Some(buffer) = buffer.upgrade(cx) {
1079                        *open_buffer = OpenBuffer::Strong(buffer);
1080                    }
1081                }
1082                OpenBuffer::Operations(_) => unreachable!(),
1083            }
1084        }
1085
1086        for worktree_handle in self.worktrees.iter_mut() {
1087            match worktree_handle {
1088                WorktreeHandle::Strong(_) => {}
1089                WorktreeHandle::Weak(worktree) => {
1090                    if let Some(worktree) = worktree.upgrade(cx) {
1091                        *worktree_handle = WorktreeHandle::Strong(worktree);
1092                    }
1093                }
1094            }
1095        }
1096
1097        for (server_id, status) in &self.language_server_statuses {
1098            self.client
1099                .send(proto::StartLanguageServer {
1100                    project_id,
1101                    server: Some(proto::LanguageServer {
1102                        id: server_id.0 as u64,
1103                        name: status.name.clone(),
1104                    }),
1105                })
1106                .log_err();
1107        }
1108
1109        let store = cx.global::<SettingsStore>();
1110        for worktree in self.worktrees(cx) {
1111            let worktree_id = worktree.read(cx).id().to_proto();
1112            for (path, content) in store.local_settings(worktree.id()) {
1113                self.client
1114                    .send(proto::UpdateWorktreeSettings {
1115                        project_id,
1116                        worktree_id,
1117                        path: path.to_string_lossy().into(),
1118                        content: Some(content),
1119                    })
1120                    .log_err();
1121            }
1122        }
1123
1124        let (updates_tx, mut updates_rx) = mpsc::unbounded();
1125        let client = self.client.clone();
1126        self.client_state = Some(ProjectClientState::Local {
1127            remote_id: project_id,
1128            updates_tx,
1129            _send_updates: cx.spawn_weak(move |this, mut cx| async move {
1130                while let Some(update) = updates_rx.next().await {
1131                    let Some(this) = this.upgrade(&cx) else { break };
1132
1133                    match update {
1134                        LocalProjectUpdate::WorktreesChanged => {
1135                            let worktrees = this
1136                                .read_with(&cx, |this, cx| this.worktrees(cx).collect::<Vec<_>>());
1137                            let update_project = this
1138                                .read_with(&cx, |this, cx| {
1139                                    this.client.request(proto::UpdateProject {
1140                                        project_id,
1141                                        worktrees: this.worktree_metadata_protos(cx),
1142                                    })
1143                                })
1144                                .await;
1145                            if update_project.is_ok() {
1146                                for worktree in worktrees {
1147                                    worktree.update(&mut cx, |worktree, cx| {
1148                                        let worktree = worktree.as_local_mut().unwrap();
1149                                        worktree.share(project_id, cx).detach_and_log_err(cx)
1150                                    });
1151                                }
1152                            }
1153                        }
1154                        LocalProjectUpdate::CreateBufferForPeer { peer_id, buffer_id } => {
1155                            let buffer = this.update(&mut cx, |this, _| {
1156                                let buffer = this.opened_buffers.get(&buffer_id).unwrap();
1157                                let shared_buffers =
1158                                    this.shared_buffers.entry(peer_id).or_default();
1159                                if shared_buffers.insert(buffer_id) {
1160                                    if let OpenBuffer::Strong(buffer) = buffer {
1161                                        Some(buffer.clone())
1162                                    } else {
1163                                        None
1164                                    }
1165                                } else {
1166                                    None
1167                                }
1168                            });
1169
1170                            let Some(buffer) = buffer else { continue };
1171                            let operations =
1172                                buffer.read_with(&cx, |b, cx| b.serialize_ops(None, cx));
1173                            let operations = operations.await;
1174                            let state = buffer.read_with(&cx, |buffer, _| buffer.to_proto());
1175
1176                            let initial_state = proto::CreateBufferForPeer {
1177                                project_id,
1178                                peer_id: Some(peer_id),
1179                                variant: Some(proto::create_buffer_for_peer::Variant::State(state)),
1180                            };
1181                            if client.send(initial_state).log_err().is_some() {
1182                                let client = client.clone();
1183                                cx.background()
1184                                    .spawn(async move {
1185                                        let mut chunks = split_operations(operations).peekable();
1186                                        while let Some(chunk) = chunks.next() {
1187                                            let is_last = chunks.peek().is_none();
1188                                            client.send(proto::CreateBufferForPeer {
1189                                                project_id,
1190                                                peer_id: Some(peer_id),
1191                                                variant: Some(
1192                                                    proto::create_buffer_for_peer::Variant::Chunk(
1193                                                        proto::BufferChunk {
1194                                                            buffer_id,
1195                                                            operations: chunk,
1196                                                            is_last,
1197                                                        },
1198                                                    ),
1199                                                ),
1200                                            })?;
1201                                        }
1202                                        anyhow::Ok(())
1203                                    })
1204                                    .await
1205                                    .log_err();
1206                            }
1207                        }
1208                    }
1209                }
1210            }),
1211        });
1212
1213        self.metadata_changed(cx);
1214        cx.emit(Event::RemoteIdChanged(Some(project_id)));
1215        cx.notify();
1216        Ok(())
1217    }
1218
1219    pub fn reshared(
1220        &mut self,
1221        message: proto::ResharedProject,
1222        cx: &mut ModelContext<Self>,
1223    ) -> Result<()> {
1224        self.shared_buffers.clear();
1225        self.set_collaborators_from_proto(message.collaborators, cx)?;
1226        self.metadata_changed(cx);
1227        Ok(())
1228    }
1229
1230    pub fn rejoined(
1231        &mut self,
1232        message: proto::RejoinedProject,
1233        message_id: u32,
1234        cx: &mut ModelContext<Self>,
1235    ) -> Result<()> {
1236        cx.update_global::<SettingsStore, _, _>(|store, cx| {
1237            for worktree in &self.worktrees {
1238                store
1239                    .clear_local_settings(worktree.handle_id(), cx)
1240                    .log_err();
1241            }
1242        });
1243
1244        self.join_project_response_message_id = message_id;
1245        self.set_worktrees_from_proto(message.worktrees, cx)?;
1246        self.set_collaborators_from_proto(message.collaborators, cx)?;
1247        self.language_server_statuses = message
1248            .language_servers
1249            .into_iter()
1250            .map(|server| {
1251                (
1252                    LanguageServerId(server.id as usize),
1253                    LanguageServerStatus {
1254                        name: server.name,
1255                        pending_work: Default::default(),
1256                        has_pending_diagnostic_updates: false,
1257                        progress_tokens: Default::default(),
1258                    },
1259                )
1260            })
1261            .collect();
1262        self.buffer_ordered_messages_tx
1263            .unbounded_send(BufferOrderedMessage::Resync)
1264            .unwrap();
1265        cx.notify();
1266        Ok(())
1267    }
1268
1269    pub fn unshare(&mut self, cx: &mut ModelContext<Self>) -> Result<()> {
1270        self.unshare_internal(cx)?;
1271        self.metadata_changed(cx);
1272        cx.notify();
1273        Ok(())
1274    }
1275
1276    fn unshare_internal(&mut self, cx: &mut AppContext) -> Result<()> {
1277        if self.is_remote() {
1278            return Err(anyhow!("attempted to unshare a remote project"));
1279        }
1280
1281        if let Some(ProjectClientState::Local { remote_id, .. }) = self.client_state.take() {
1282            self.collaborators.clear();
1283            self.shared_buffers.clear();
1284            self.client_subscriptions.clear();
1285
1286            for worktree_handle in self.worktrees.iter_mut() {
1287                if let WorktreeHandle::Strong(worktree) = worktree_handle {
1288                    let is_visible = worktree.update(cx, |worktree, _| {
1289                        worktree.as_local_mut().unwrap().unshare();
1290                        worktree.is_visible()
1291                    });
1292                    if !is_visible {
1293                        *worktree_handle = WorktreeHandle::Weak(worktree.downgrade());
1294                    }
1295                }
1296            }
1297
1298            for open_buffer in self.opened_buffers.values_mut() {
1299                // Wake up any tasks waiting for peers' edits to this buffer.
1300                if let Some(buffer) = open_buffer.upgrade(cx) {
1301                    buffer.update(cx, |buffer, _| buffer.give_up_waiting());
1302                }
1303
1304                if let OpenBuffer::Strong(buffer) = open_buffer {
1305                    *open_buffer = OpenBuffer::Weak(buffer.downgrade());
1306                }
1307            }
1308
1309            self.client.send(proto::UnshareProject {
1310                project_id: remote_id,
1311            })?;
1312
1313            Ok(())
1314        } else {
1315            Err(anyhow!("attempted to unshare an unshared project"))
1316        }
1317    }
1318
1319    pub fn disconnected_from_host(&mut self, cx: &mut ModelContext<Self>) {
1320        self.disconnected_from_host_internal(cx);
1321        cx.emit(Event::DisconnectedFromHost);
1322        cx.notify();
1323    }
1324
1325    fn disconnected_from_host_internal(&mut self, cx: &mut AppContext) {
1326        if let Some(ProjectClientState::Remote {
1327            sharing_has_stopped,
1328            ..
1329        }) = &mut self.client_state
1330        {
1331            *sharing_has_stopped = true;
1332
1333            self.collaborators.clear();
1334
1335            for worktree in &self.worktrees {
1336                if let Some(worktree) = worktree.upgrade(cx) {
1337                    worktree.update(cx, |worktree, _| {
1338                        if let Some(worktree) = worktree.as_remote_mut() {
1339                            worktree.disconnected_from_host();
1340                        }
1341                    });
1342                }
1343            }
1344
1345            for open_buffer in self.opened_buffers.values_mut() {
1346                // Wake up any tasks waiting for peers' edits to this buffer.
1347                if let Some(buffer) = open_buffer.upgrade(cx) {
1348                    buffer.update(cx, |buffer, _| buffer.give_up_waiting());
1349                }
1350
1351                if let OpenBuffer::Strong(buffer) = open_buffer {
1352                    *open_buffer = OpenBuffer::Weak(buffer.downgrade());
1353                }
1354            }
1355
1356            // Wake up all futures currently waiting on a buffer to get opened,
1357            // to give them a chance to fail now that we've disconnected.
1358            *self.opened_buffer.0.borrow_mut() = ();
1359        }
1360    }
1361
1362    pub fn close(&mut self, cx: &mut ModelContext<Self>) {
1363        cx.emit(Event::Closed);
1364    }
1365
1366    pub fn is_read_only(&self) -> bool {
1367        match &self.client_state {
1368            Some(ProjectClientState::Remote {
1369                sharing_has_stopped,
1370                ..
1371            }) => *sharing_has_stopped,
1372            _ => false,
1373        }
1374    }
1375
1376    pub fn is_local(&self) -> bool {
1377        match &self.client_state {
1378            Some(ProjectClientState::Remote { .. }) => false,
1379            _ => true,
1380        }
1381    }
1382
1383    pub fn is_remote(&self) -> bool {
1384        !self.is_local()
1385    }
1386
1387    pub fn create_buffer(
1388        &mut self,
1389        text: &str,
1390        language: Option<Arc<Language>>,
1391        cx: &mut ModelContext<Self>,
1392    ) -> Result<ModelHandle<Buffer>> {
1393        if self.is_remote() {
1394            return Err(anyhow!("creating buffers as a guest is not supported yet"));
1395        }
1396
1397        let buffer = cx.add_model(|cx| {
1398            Buffer::new(self.replica_id(), text, cx)
1399                .with_language(language.unwrap_or_else(|| language::PLAIN_TEXT.clone()), cx)
1400        });
1401        self.register_buffer(&buffer, cx)?;
1402        Ok(buffer)
1403    }
1404
1405    pub fn open_path(
1406        &mut self,
1407        path: impl Into<ProjectPath>,
1408        cx: &mut ModelContext<Self>,
1409    ) -> Task<Result<(ProjectEntryId, AnyModelHandle)>> {
1410        let task = self.open_buffer(path, cx);
1411        cx.spawn_weak(|_, cx| async move {
1412            let buffer = task.await?;
1413            let project_entry_id = buffer
1414                .read_with(&cx, |buffer, cx| {
1415                    File::from_dyn(buffer.file()).and_then(|file| file.project_entry_id(cx))
1416                })
1417                .ok_or_else(|| anyhow!("no project entry"))?;
1418
1419            let buffer: &AnyModelHandle = &buffer;
1420            Ok((project_entry_id, buffer.clone()))
1421        })
1422    }
1423
1424    pub fn open_local_buffer(
1425        &mut self,
1426        abs_path: impl AsRef<Path>,
1427        cx: &mut ModelContext<Self>,
1428    ) -> Task<Result<ModelHandle<Buffer>>> {
1429        if let Some((worktree, relative_path)) = self.find_local_worktree(abs_path.as_ref(), cx) {
1430            self.open_buffer((worktree.read(cx).id(), relative_path), cx)
1431        } else {
1432            Task::ready(Err(anyhow!("no such path")))
1433        }
1434    }
1435
1436    pub fn open_buffer(
1437        &mut self,
1438        path: impl Into<ProjectPath>,
1439        cx: &mut ModelContext<Self>,
1440    ) -> Task<Result<ModelHandle<Buffer>>> {
1441        let project_path = path.into();
1442        let worktree = if let Some(worktree) = self.worktree_for_id(project_path.worktree_id, cx) {
1443            worktree
1444        } else {
1445            return Task::ready(Err(anyhow!("no such worktree")));
1446        };
1447
1448        // If there is already a buffer for the given path, then return it.
1449        let existing_buffer = self.get_open_buffer(&project_path, cx);
1450        if let Some(existing_buffer) = existing_buffer {
1451            return Task::ready(Ok(existing_buffer));
1452        }
1453
1454        let loading_watch = match self.loading_buffers_by_path.entry(project_path.clone()) {
1455            // If the given path is already being loaded, then wait for that existing
1456            // task to complete and return the same buffer.
1457            hash_map::Entry::Occupied(e) => e.get().clone(),
1458
1459            // Otherwise, record the fact that this path is now being loaded.
1460            hash_map::Entry::Vacant(entry) => {
1461                let (mut tx, rx) = postage::watch::channel();
1462                entry.insert(rx.clone());
1463
1464                let load_buffer = if worktree.read(cx).is_local() {
1465                    self.open_local_buffer_internal(&project_path.path, &worktree, cx)
1466                } else {
1467                    self.open_remote_buffer_internal(&project_path.path, &worktree, cx)
1468                };
1469
1470                cx.spawn(move |this, mut cx| async move {
1471                    let load_result = load_buffer.await;
1472                    *tx.borrow_mut() = Some(this.update(&mut cx, |this, _| {
1473                        // Record the fact that the buffer is no longer loading.
1474                        this.loading_buffers_by_path.remove(&project_path);
1475                        let buffer = load_result.map_err(Arc::new)?;
1476                        Ok(buffer)
1477                    }));
1478                })
1479                .detach();
1480                rx
1481            }
1482        };
1483
1484        cx.foreground().spawn(async move {
1485            wait_for_loading_buffer(loading_watch)
1486                .await
1487                .map_err(|error| anyhow!("{}", error))
1488        })
1489    }
1490
1491    fn open_local_buffer_internal(
1492        &mut self,
1493        path: &Arc<Path>,
1494        worktree: &ModelHandle<Worktree>,
1495        cx: &mut ModelContext<Self>,
1496    ) -> Task<Result<ModelHandle<Buffer>>> {
1497        let buffer_id = post_inc(&mut self.next_buffer_id);
1498        let load_buffer = worktree.update(cx, |worktree, cx| {
1499            let worktree = worktree.as_local_mut().unwrap();
1500            worktree.load_buffer(buffer_id, path, cx)
1501        });
1502        cx.spawn(|this, mut cx| async move {
1503            let buffer = load_buffer.await?;
1504            this.update(&mut cx, |this, cx| this.register_buffer(&buffer, cx))?;
1505            Ok(buffer)
1506        })
1507    }
1508
1509    fn open_remote_buffer_internal(
1510        &mut self,
1511        path: &Arc<Path>,
1512        worktree: &ModelHandle<Worktree>,
1513        cx: &mut ModelContext<Self>,
1514    ) -> Task<Result<ModelHandle<Buffer>>> {
1515        let rpc = self.client.clone();
1516        let project_id = self.remote_id().unwrap();
1517        let remote_worktree_id = worktree.read(cx).id();
1518        let path = path.clone();
1519        let path_string = path.to_string_lossy().to_string();
1520        cx.spawn(|this, mut cx| async move {
1521            let response = rpc
1522                .request(proto::OpenBufferByPath {
1523                    project_id,
1524                    worktree_id: remote_worktree_id.to_proto(),
1525                    path: path_string,
1526                })
1527                .await?;
1528            this.update(&mut cx, |this, cx| {
1529                this.wait_for_remote_buffer(response.buffer_id, cx)
1530            })
1531            .await
1532        })
1533    }
1534
1535    /// LanguageServerName is owned, because it is inserted into a map
1536    fn open_local_buffer_via_lsp(
1537        &mut self,
1538        abs_path: lsp::Url,
1539        language_server_id: LanguageServerId,
1540        language_server_name: LanguageServerName,
1541        cx: &mut ModelContext<Self>,
1542    ) -> Task<Result<ModelHandle<Buffer>>> {
1543        cx.spawn(|this, mut cx| async move {
1544            let abs_path = abs_path
1545                .to_file_path()
1546                .map_err(|_| anyhow!("can't convert URI to path"))?;
1547            let (worktree, relative_path) = if let Some(result) =
1548                this.read_with(&cx, |this, cx| this.find_local_worktree(&abs_path, cx))
1549            {
1550                result
1551            } else {
1552                let worktree = this
1553                    .update(&mut cx, |this, cx| {
1554                        this.create_local_worktree(&abs_path, false, cx)
1555                    })
1556                    .await?;
1557                this.update(&mut cx, |this, cx| {
1558                    this.language_server_ids.insert(
1559                        (worktree.read(cx).id(), language_server_name),
1560                        language_server_id,
1561                    );
1562                });
1563                (worktree, PathBuf::new())
1564            };
1565
1566            let project_path = ProjectPath {
1567                worktree_id: worktree.read_with(&cx, |worktree, _| worktree.id()),
1568                path: relative_path.into(),
1569            };
1570            this.update(&mut cx, |this, cx| this.open_buffer(project_path, cx))
1571                .await
1572        })
1573    }
1574
1575    pub fn open_buffer_by_id(
1576        &mut self,
1577        id: u64,
1578        cx: &mut ModelContext<Self>,
1579    ) -> Task<Result<ModelHandle<Buffer>>> {
1580        if let Some(buffer) = self.buffer_for_id(id, cx) {
1581            Task::ready(Ok(buffer))
1582        } else if self.is_local() {
1583            Task::ready(Err(anyhow!("buffer {} does not exist", id)))
1584        } else if let Some(project_id) = self.remote_id() {
1585            let request = self
1586                .client
1587                .request(proto::OpenBufferById { project_id, id });
1588            cx.spawn(|this, mut cx| async move {
1589                let buffer_id = request.await?.buffer_id;
1590                this.update(&mut cx, |this, cx| {
1591                    this.wait_for_remote_buffer(buffer_id, cx)
1592                })
1593                .await
1594            })
1595        } else {
1596            Task::ready(Err(anyhow!("cannot open buffer while disconnected")))
1597        }
1598    }
1599
1600    pub fn save_buffers(
1601        &self,
1602        buffers: HashSet<ModelHandle<Buffer>>,
1603        cx: &mut ModelContext<Self>,
1604    ) -> Task<Result<()>> {
1605        cx.spawn(|this, mut cx| async move {
1606            let save_tasks = buffers
1607                .into_iter()
1608                .map(|buffer| this.update(&mut cx, |this, cx| this.save_buffer(buffer, cx)));
1609            try_join_all(save_tasks).await?;
1610            Ok(())
1611        })
1612    }
1613
1614    pub fn save_buffer(
1615        &self,
1616        buffer: ModelHandle<Buffer>,
1617        cx: &mut ModelContext<Self>,
1618    ) -> Task<Result<(clock::Global, RopeFingerprint, SystemTime)>> {
1619        let Some(file) = File::from_dyn(buffer.read(cx).file()) else {
1620            return Task::ready(Err(anyhow!("buffer doesn't have a file")));
1621        };
1622        let worktree = file.worktree.clone();
1623        let path = file.path.clone();
1624        worktree.update(cx, |worktree, cx| match worktree {
1625            Worktree::Local(worktree) => worktree.save_buffer(buffer, path, false, cx),
1626            Worktree::Remote(worktree) => worktree.save_buffer(buffer, cx),
1627        })
1628    }
1629
1630    pub fn save_buffer_as(
1631        &mut self,
1632        buffer: ModelHandle<Buffer>,
1633        abs_path: PathBuf,
1634        cx: &mut ModelContext<Self>,
1635    ) -> Task<Result<()>> {
1636        let worktree_task = self.find_or_create_local_worktree(&abs_path, true, cx);
1637        let old_file = File::from_dyn(buffer.read(cx).file())
1638            .filter(|f| f.is_local())
1639            .cloned();
1640        cx.spawn(|this, mut cx| async move {
1641            if let Some(old_file) = &old_file {
1642                this.update(&mut cx, |this, cx| {
1643                    this.unregister_buffer_from_language_servers(&buffer, old_file, cx);
1644                });
1645            }
1646            let (worktree, path) = worktree_task.await?;
1647            worktree
1648                .update(&mut cx, |worktree, cx| match worktree {
1649                    Worktree::Local(worktree) => {
1650                        worktree.save_buffer(buffer.clone(), path.into(), true, cx)
1651                    }
1652                    Worktree::Remote(_) => panic!("cannot remote buffers as new files"),
1653                })
1654                .await?;
1655            this.update(&mut cx, |this, cx| {
1656                this.detect_language_for_buffer(&buffer, cx);
1657                this.register_buffer_with_language_servers(&buffer, cx);
1658            });
1659            Ok(())
1660        })
1661    }
1662
1663    pub fn get_open_buffer(
1664        &mut self,
1665        path: &ProjectPath,
1666        cx: &mut ModelContext<Self>,
1667    ) -> Option<ModelHandle<Buffer>> {
1668        let worktree = self.worktree_for_id(path.worktree_id, cx)?;
1669        self.opened_buffers.values().find_map(|buffer| {
1670            let buffer = buffer.upgrade(cx)?;
1671            let file = File::from_dyn(buffer.read(cx).file())?;
1672            if file.worktree == worktree && file.path() == &path.path {
1673                Some(buffer)
1674            } else {
1675                None
1676            }
1677        })
1678    }
1679
1680    fn register_buffer(
1681        &mut self,
1682        buffer: &ModelHandle<Buffer>,
1683        cx: &mut ModelContext<Self>,
1684    ) -> Result<()> {
1685        self.request_buffer_diff_recalculation(buffer, cx);
1686        buffer.update(cx, |buffer, _| {
1687            buffer.set_language_registry(self.languages.clone())
1688        });
1689
1690        let remote_id = buffer.read(cx).remote_id();
1691        let is_remote = self.is_remote();
1692        let open_buffer = if is_remote || self.is_shared() {
1693            OpenBuffer::Strong(buffer.clone())
1694        } else {
1695            OpenBuffer::Weak(buffer.downgrade())
1696        };
1697
1698        match self.opened_buffers.entry(remote_id) {
1699            hash_map::Entry::Vacant(entry) => {
1700                entry.insert(open_buffer);
1701            }
1702            hash_map::Entry::Occupied(mut entry) => {
1703                if let OpenBuffer::Operations(operations) = entry.get_mut() {
1704                    buffer.update(cx, |b, cx| b.apply_ops(operations.drain(..), cx))?;
1705                } else if entry.get().upgrade(cx).is_some() {
1706                    if is_remote {
1707                        return Ok(());
1708                    } else {
1709                        debug_panic!("buffer {} was already registered", remote_id);
1710                        Err(anyhow!("buffer {} was already registered", remote_id))?;
1711                    }
1712                }
1713                entry.insert(open_buffer);
1714            }
1715        }
1716        cx.subscribe(buffer, |this, buffer, event, cx| {
1717            this.on_buffer_event(buffer, event, cx);
1718        })
1719        .detach();
1720
1721        if let Some(file) = File::from_dyn(buffer.read(cx).file()) {
1722            if file.is_local {
1723                self.local_buffer_ids_by_path.insert(
1724                    ProjectPath {
1725                        worktree_id: file.worktree_id(cx),
1726                        path: file.path.clone(),
1727                    },
1728                    remote_id,
1729                );
1730
1731                self.local_buffer_ids_by_entry_id
1732                    .insert(file.entry_id, remote_id);
1733            }
1734        }
1735
1736        self.detect_language_for_buffer(buffer, cx);
1737        self.register_buffer_with_language_servers(buffer, cx);
1738        self.register_buffer_with_copilot(buffer, cx);
1739        cx.observe_release(buffer, |this, buffer, cx| {
1740            if let Some(file) = File::from_dyn(buffer.file()) {
1741                if file.is_local() {
1742                    let uri = lsp::Url::from_file_path(file.abs_path(cx)).unwrap();
1743                    for server in this.language_servers_for_buffer(buffer, cx) {
1744                        server
1745                            .1
1746                            .notify::<lsp::notification::DidCloseTextDocument>(
1747                                lsp::DidCloseTextDocumentParams {
1748                                    text_document: lsp::TextDocumentIdentifier::new(uri.clone()),
1749                                },
1750                            )
1751                            .log_err();
1752                    }
1753                }
1754            }
1755        })
1756        .detach();
1757
1758        *self.opened_buffer.0.borrow_mut() = ();
1759        Ok(())
1760    }
1761
1762    fn register_buffer_with_language_servers(
1763        &mut self,
1764        buffer_handle: &ModelHandle<Buffer>,
1765        cx: &mut ModelContext<Self>,
1766    ) {
1767        let buffer = buffer_handle.read(cx);
1768        let buffer_id = buffer.remote_id();
1769
1770        if let Some(file) = File::from_dyn(buffer.file()) {
1771            if !file.is_local() {
1772                return;
1773            }
1774
1775            let uri = lsp::Url::from_file_path(file.abs_path(cx)).unwrap();
1776            let initial_snapshot = buffer.text_snapshot();
1777            let language = buffer.language().cloned();
1778            let worktree_id = file.worktree_id(cx);
1779
1780            if let Some(local_worktree) = file.worktree.read(cx).as_local() {
1781                for (server_id, diagnostics) in local_worktree.diagnostics_for_path(file.path()) {
1782                    self.update_buffer_diagnostics(buffer_handle, server_id, None, diagnostics, cx)
1783                        .log_err();
1784                }
1785            }
1786
1787            if let Some(language) = language {
1788                for adapter in language.lsp_adapters() {
1789                    let language_id = adapter.language_ids.get(language.name().as_ref()).cloned();
1790                    let server = self
1791                        .language_server_ids
1792                        .get(&(worktree_id, adapter.name.clone()))
1793                        .and_then(|id| self.language_servers.get(id))
1794                        .and_then(|server_state| {
1795                            if let LanguageServerState::Running { server, .. } = server_state {
1796                                Some(server.clone())
1797                            } else {
1798                                None
1799                            }
1800                        });
1801                    let server = match server {
1802                        Some(server) => server,
1803                        None => continue,
1804                    };
1805
1806                    server
1807                        .notify::<lsp::notification::DidOpenTextDocument>(
1808                            lsp::DidOpenTextDocumentParams {
1809                                text_document: lsp::TextDocumentItem::new(
1810                                    uri.clone(),
1811                                    language_id.unwrap_or_default(),
1812                                    0,
1813                                    initial_snapshot.text(),
1814                                ),
1815                            },
1816                        )
1817                        .log_err();
1818
1819                    buffer_handle.update(cx, |buffer, cx| {
1820                        buffer.set_completion_triggers(
1821                            server
1822                                .capabilities()
1823                                .completion_provider
1824                                .as_ref()
1825                                .and_then(|provider| provider.trigger_characters.clone())
1826                                .unwrap_or_default(),
1827                            cx,
1828                        );
1829                    });
1830
1831                    let snapshot = LspBufferSnapshot {
1832                        version: 0,
1833                        snapshot: initial_snapshot.clone(),
1834                    };
1835                    self.buffer_snapshots
1836                        .entry(buffer_id)
1837                        .or_default()
1838                        .insert(server.server_id(), vec![snapshot]);
1839                }
1840            }
1841        }
1842    }
1843
1844    fn unregister_buffer_from_language_servers(
1845        &mut self,
1846        buffer: &ModelHandle<Buffer>,
1847        old_file: &File,
1848        cx: &mut ModelContext<Self>,
1849    ) {
1850        let old_path = match old_file.as_local() {
1851            Some(local) => local.abs_path(cx),
1852            None => return,
1853        };
1854
1855        buffer.update(cx, |buffer, cx| {
1856            let worktree_id = old_file.worktree_id(cx);
1857            let ids = &self.language_server_ids;
1858
1859            let language = buffer.language().cloned();
1860            let adapters = language.iter().flat_map(|language| language.lsp_adapters());
1861            for &server_id in adapters.flat_map(|a| ids.get(&(worktree_id, a.name.clone()))) {
1862                buffer.update_diagnostics(server_id, Default::default(), cx);
1863            }
1864
1865            self.buffer_snapshots.remove(&buffer.remote_id());
1866            let file_url = lsp::Url::from_file_path(old_path).unwrap();
1867            for (_, language_server) in self.language_servers_for_buffer(buffer, cx) {
1868                language_server
1869                    .notify::<lsp::notification::DidCloseTextDocument>(
1870                        lsp::DidCloseTextDocumentParams {
1871                            text_document: lsp::TextDocumentIdentifier::new(file_url.clone()),
1872                        },
1873                    )
1874                    .log_err();
1875            }
1876        });
1877    }
1878
1879    fn register_buffer_with_copilot(
1880        &self,
1881        buffer_handle: &ModelHandle<Buffer>,
1882        cx: &mut ModelContext<Self>,
1883    ) {
1884        if let Some(copilot) = Copilot::global(cx) {
1885            copilot.update(cx, |copilot, cx| copilot.register_buffer(buffer_handle, cx));
1886        }
1887    }
1888
1889    async fn send_buffer_ordered_messages(
1890        this: WeakModelHandle<Self>,
1891        rx: UnboundedReceiver<BufferOrderedMessage>,
1892        mut cx: AsyncAppContext,
1893    ) -> Option<()> {
1894        const MAX_BATCH_SIZE: usize = 128;
1895
1896        let mut operations_by_buffer_id = HashMap::default();
1897        async fn flush_operations(
1898            this: &ModelHandle<Project>,
1899            operations_by_buffer_id: &mut HashMap<u64, Vec<proto::Operation>>,
1900            needs_resync_with_host: &mut bool,
1901            is_local: bool,
1902            cx: &AsyncAppContext,
1903        ) {
1904            for (buffer_id, operations) in operations_by_buffer_id.drain() {
1905                let request = this.read_with(cx, |this, _| {
1906                    let project_id = this.remote_id()?;
1907                    Some(this.client.request(proto::UpdateBuffer {
1908                        buffer_id,
1909                        project_id,
1910                        operations,
1911                    }))
1912                });
1913                if let Some(request) = request {
1914                    if request.await.is_err() && !is_local {
1915                        *needs_resync_with_host = true;
1916                        break;
1917                    }
1918                }
1919            }
1920        }
1921
1922        let mut needs_resync_with_host = false;
1923        let mut changes = rx.ready_chunks(MAX_BATCH_SIZE);
1924
1925        while let Some(changes) = changes.next().await {
1926            let this = this.upgrade(&mut cx)?;
1927            let is_local = this.read_with(&cx, |this, _| this.is_local());
1928
1929            for change in changes {
1930                match change {
1931                    BufferOrderedMessage::Operation {
1932                        buffer_id,
1933                        operation,
1934                    } => {
1935                        if needs_resync_with_host {
1936                            continue;
1937                        }
1938
1939                        operations_by_buffer_id
1940                            .entry(buffer_id)
1941                            .or_insert(Vec::new())
1942                            .push(operation);
1943                    }
1944
1945                    BufferOrderedMessage::Resync => {
1946                        operations_by_buffer_id.clear();
1947                        if this
1948                            .update(&mut cx, |this, cx| this.synchronize_remote_buffers(cx))
1949                            .await
1950                            .is_ok()
1951                        {
1952                            needs_resync_with_host = false;
1953                        }
1954                    }
1955
1956                    BufferOrderedMessage::LanguageServerUpdate {
1957                        language_server_id,
1958                        message,
1959                    } => {
1960                        flush_operations(
1961                            &this,
1962                            &mut operations_by_buffer_id,
1963                            &mut needs_resync_with_host,
1964                            is_local,
1965                            &cx,
1966                        )
1967                        .await;
1968
1969                        this.read_with(&cx, |this, _| {
1970                            if let Some(project_id) = this.remote_id() {
1971                                this.client
1972                                    .send(proto::UpdateLanguageServer {
1973                                        project_id,
1974                                        language_server_id: language_server_id.0 as u64,
1975                                        variant: Some(message),
1976                                    })
1977                                    .log_err();
1978                            }
1979                        });
1980                    }
1981                }
1982            }
1983
1984            flush_operations(
1985                &this,
1986                &mut operations_by_buffer_id,
1987                &mut needs_resync_with_host,
1988                is_local,
1989                &cx,
1990            )
1991            .await;
1992        }
1993
1994        None
1995    }
1996
1997    fn on_buffer_event(
1998        &mut self,
1999        buffer: ModelHandle<Buffer>,
2000        event: &BufferEvent,
2001        cx: &mut ModelContext<Self>,
2002    ) -> Option<()> {
2003        if matches!(
2004            event,
2005            BufferEvent::Edited { .. } | BufferEvent::Reloaded | BufferEvent::DiffBaseChanged
2006        ) {
2007            self.request_buffer_diff_recalculation(&buffer, cx);
2008        }
2009
2010        match event {
2011            BufferEvent::Operation(operation) => {
2012                self.buffer_ordered_messages_tx
2013                    .unbounded_send(BufferOrderedMessage::Operation {
2014                        buffer_id: buffer.read(cx).remote_id(),
2015                        operation: language::proto::serialize_operation(operation),
2016                    })
2017                    .ok();
2018            }
2019
2020            BufferEvent::Edited { .. } => {
2021                let buffer = buffer.read(cx);
2022                let file = File::from_dyn(buffer.file())?;
2023                let abs_path = file.as_local()?.abs_path(cx);
2024                let uri = lsp::Url::from_file_path(abs_path).unwrap();
2025                let next_snapshot = buffer.text_snapshot();
2026
2027                let language_servers: Vec<_> = self
2028                    .language_servers_for_buffer(buffer, cx)
2029                    .map(|i| i.1.clone())
2030                    .collect();
2031
2032                for language_server in language_servers {
2033                    let language_server = language_server.clone();
2034
2035                    let buffer_snapshots = self
2036                        .buffer_snapshots
2037                        .get_mut(&buffer.remote_id())
2038                        .and_then(|m| m.get_mut(&language_server.server_id()))?;
2039                    let previous_snapshot = buffer_snapshots.last()?;
2040                    let next_version = previous_snapshot.version + 1;
2041
2042                    let content_changes = buffer
2043                        .edits_since::<(PointUtf16, usize)>(previous_snapshot.snapshot.version())
2044                        .map(|edit| {
2045                            let edit_start = edit.new.start.0;
2046                            let edit_end = edit_start + (edit.old.end.0 - edit.old.start.0);
2047                            let new_text = next_snapshot
2048                                .text_for_range(edit.new.start.1..edit.new.end.1)
2049                                .collect();
2050                            lsp::TextDocumentContentChangeEvent {
2051                                range: Some(lsp::Range::new(
2052                                    point_to_lsp(edit_start),
2053                                    point_to_lsp(edit_end),
2054                                )),
2055                                range_length: None,
2056                                text: new_text,
2057                            }
2058                        })
2059                        .collect();
2060
2061                    buffer_snapshots.push(LspBufferSnapshot {
2062                        version: next_version,
2063                        snapshot: next_snapshot.clone(),
2064                    });
2065
2066                    language_server
2067                        .notify::<lsp::notification::DidChangeTextDocument>(
2068                            lsp::DidChangeTextDocumentParams {
2069                                text_document: lsp::VersionedTextDocumentIdentifier::new(
2070                                    uri.clone(),
2071                                    next_version,
2072                                ),
2073                                content_changes,
2074                            },
2075                        )
2076                        .log_err();
2077                }
2078            }
2079
2080            BufferEvent::Saved => {
2081                let file = File::from_dyn(buffer.read(cx).file())?;
2082                let worktree_id = file.worktree_id(cx);
2083                let abs_path = file.as_local()?.abs_path(cx);
2084                let text_document = lsp::TextDocumentIdentifier {
2085                    uri: lsp::Url::from_file_path(abs_path).unwrap(),
2086                };
2087
2088                for (_, _, server) in self.language_servers_for_worktree(worktree_id) {
2089                    server
2090                        .notify::<lsp::notification::DidSaveTextDocument>(
2091                            lsp::DidSaveTextDocumentParams {
2092                                text_document: text_document.clone(),
2093                                text: None,
2094                            },
2095                        )
2096                        .log_err();
2097                }
2098
2099                let language_server_ids = self.language_server_ids_for_buffer(buffer.read(cx), cx);
2100                for language_server_id in language_server_ids {
2101                    if let Some(LanguageServerState::Running {
2102                        adapter,
2103                        simulate_disk_based_diagnostics_completion,
2104                        ..
2105                    }) = self.language_servers.get_mut(&language_server_id)
2106                    {
2107                        // After saving a buffer using a language server that doesn't provide
2108                        // a disk-based progress token, kick off a timer that will reset every
2109                        // time the buffer is saved. If the timer eventually fires, simulate
2110                        // disk-based diagnostics being finished so that other pieces of UI
2111                        // (e.g., project diagnostics view, diagnostic status bar) can update.
2112                        // We don't emit an event right away because the language server might take
2113                        // some time to publish diagnostics.
2114                        if adapter.disk_based_diagnostics_progress_token.is_none() {
2115                            const DISK_BASED_DIAGNOSTICS_DEBOUNCE: Duration =
2116                                Duration::from_secs(1);
2117
2118                            let task = cx.spawn_weak(|this, mut cx| async move {
2119                                cx.background().timer(DISK_BASED_DIAGNOSTICS_DEBOUNCE).await;
2120                                if let Some(this) = this.upgrade(&cx) {
2121                                    this.update(&mut cx, |this, cx| {
2122                                        this.disk_based_diagnostics_finished(
2123                                            language_server_id,
2124                                            cx,
2125                                        );
2126                                        this.buffer_ordered_messages_tx
2127                                            .unbounded_send(
2128                                                BufferOrderedMessage::LanguageServerUpdate {
2129                                                    language_server_id,
2130                                                    message:proto::update_language_server::Variant::DiskBasedDiagnosticsUpdated(Default::default())
2131                                                },
2132                                            )
2133                                            .ok();
2134                                    });
2135                                }
2136                            });
2137                            *simulate_disk_based_diagnostics_completion = Some(task);
2138                        }
2139                    }
2140                }
2141            }
2142
2143            _ => {}
2144        }
2145
2146        None
2147    }
2148
2149    fn request_buffer_diff_recalculation(
2150        &mut self,
2151        buffer: &ModelHandle<Buffer>,
2152        cx: &mut ModelContext<Self>,
2153    ) {
2154        self.buffers_needing_diff.insert(buffer.downgrade());
2155        let first_insertion = self.buffers_needing_diff.len() == 1;
2156
2157        let settings = settings::get::<ProjectSettings>(cx);
2158        let delay = if let Some(delay) = settings.git.gutter_debounce {
2159            delay
2160        } else {
2161            if first_insertion {
2162                let this = cx.weak_handle();
2163                cx.defer(move |cx| {
2164                    if let Some(this) = this.upgrade(cx) {
2165                        this.update(cx, |this, cx| {
2166                            this.recalculate_buffer_diffs(cx).detach();
2167                        });
2168                    }
2169                });
2170            }
2171            return;
2172        };
2173
2174        const MIN_DELAY: u64 = 50;
2175        let delay = delay.max(MIN_DELAY);
2176        let duration = Duration::from_millis(delay);
2177
2178        self.git_diff_debouncer
2179            .fire_new(duration, cx, move |this, cx| {
2180                this.recalculate_buffer_diffs(cx)
2181            });
2182    }
2183
2184    fn recalculate_buffer_diffs(&mut self, cx: &mut ModelContext<Self>) -> Task<()> {
2185        cx.spawn(|this, mut cx| async move {
2186            let buffers: Vec<_> = this.update(&mut cx, |this, _| {
2187                this.buffers_needing_diff.drain().collect()
2188            });
2189
2190            let tasks: Vec<_> = this.update(&mut cx, |_, cx| {
2191                buffers
2192                    .iter()
2193                    .filter_map(|buffer| {
2194                        let buffer = buffer.upgrade(cx)?;
2195                        buffer.update(cx, |buffer, cx| buffer.git_diff_recalc(cx))
2196                    })
2197                    .collect()
2198            });
2199
2200            futures::future::join_all(tasks).await;
2201
2202            this.update(&mut cx, |this, cx| {
2203                if !this.buffers_needing_diff.is_empty() {
2204                    this.recalculate_buffer_diffs(cx).detach();
2205                } else {
2206                    // TODO: Would a `ModelContext<Project>.notify()` suffice here?
2207                    for buffer in buffers {
2208                        if let Some(buffer) = buffer.upgrade(cx) {
2209                            buffer.update(cx, |_, cx| cx.notify());
2210                        }
2211                    }
2212                }
2213            });
2214        })
2215    }
2216
2217    fn language_servers_for_worktree(
2218        &self,
2219        worktree_id: WorktreeId,
2220    ) -> impl Iterator<Item = (&Arc<CachedLspAdapter>, &Arc<Language>, &Arc<LanguageServer>)> {
2221        self.language_server_ids
2222            .iter()
2223            .filter_map(move |((language_server_worktree_id, _), id)| {
2224                if *language_server_worktree_id == worktree_id {
2225                    if let Some(LanguageServerState::Running {
2226                        adapter,
2227                        language,
2228                        server,
2229                        ..
2230                    }) = self.language_servers.get(id)
2231                    {
2232                        return Some((adapter, language, server));
2233                    }
2234                }
2235                None
2236            })
2237    }
2238
2239    fn maintain_buffer_languages(
2240        languages: &LanguageRegistry,
2241        cx: &mut ModelContext<Project>,
2242    ) -> Task<()> {
2243        let mut subscription = languages.subscribe();
2244        cx.spawn_weak(|project, mut cx| async move {
2245            while let Some(()) = subscription.next().await {
2246                if let Some(project) = project.upgrade(&cx) {
2247                    project.update(&mut cx, |project, cx| {
2248                        let mut plain_text_buffers = Vec::new();
2249                        let mut buffers_with_unknown_injections = Vec::new();
2250                        for buffer in project.opened_buffers.values() {
2251                            if let Some(handle) = buffer.upgrade(cx) {
2252                                let buffer = &handle.read(cx);
2253                                if buffer.language().is_none()
2254                                    || buffer.language() == Some(&*language::PLAIN_TEXT)
2255                                {
2256                                    plain_text_buffers.push(handle);
2257                                } else if buffer.contains_unknown_injections() {
2258                                    buffers_with_unknown_injections.push(handle);
2259                                }
2260                            }
2261                        }
2262
2263                        for buffer in plain_text_buffers {
2264                            project.detect_language_for_buffer(&buffer, cx);
2265                            project.register_buffer_with_language_servers(&buffer, cx);
2266                        }
2267
2268                        for buffer in buffers_with_unknown_injections {
2269                            buffer.update(cx, |buffer, cx| buffer.reparse(cx));
2270                        }
2271                    });
2272                }
2273            }
2274        })
2275    }
2276
2277    fn maintain_workspace_config(
2278        languages: Arc<LanguageRegistry>,
2279        cx: &mut ModelContext<Project>,
2280    ) -> Task<()> {
2281        let (mut settings_changed_tx, mut settings_changed_rx) = watch::channel();
2282        let _ = postage::stream::Stream::try_recv(&mut settings_changed_rx);
2283
2284        let settings_observation = cx.observe_global::<SettingsStore, _>(move |_, _| {
2285            *settings_changed_tx.borrow_mut() = ();
2286        });
2287        cx.spawn_weak(|this, mut cx| async move {
2288            while let Some(_) = settings_changed_rx.next().await {
2289                let workspace_config = cx.update(|cx| languages.workspace_configuration(cx)).await;
2290                if let Some(this) = this.upgrade(&cx) {
2291                    this.read_with(&cx, |this, _| {
2292                        for server_state in this.language_servers.values() {
2293                            if let LanguageServerState::Running { server, .. } = server_state {
2294                                server
2295                                    .notify::<lsp::notification::DidChangeConfiguration>(
2296                                        lsp::DidChangeConfigurationParams {
2297                                            settings: workspace_config.clone(),
2298                                        },
2299                                    )
2300                                    .ok();
2301                            }
2302                        }
2303                    })
2304                } else {
2305                    break;
2306                }
2307            }
2308
2309            drop(settings_observation);
2310        })
2311    }
2312
2313    fn detect_language_for_buffer(
2314        &mut self,
2315        buffer_handle: &ModelHandle<Buffer>,
2316        cx: &mut ModelContext<Self>,
2317    ) -> Option<()> {
2318        // If the buffer has a language, set it and start the language server if we haven't already.
2319        let buffer = buffer_handle.read(cx);
2320        let full_path = buffer.file()?.full_path(cx);
2321        let content = buffer.as_rope();
2322        let new_language = self
2323            .languages
2324            .language_for_file(&full_path, Some(content))
2325            .now_or_never()?
2326            .ok()?;
2327        self.set_language_for_buffer(buffer_handle, new_language, cx);
2328        None
2329    }
2330
2331    pub fn set_language_for_buffer(
2332        &mut self,
2333        buffer: &ModelHandle<Buffer>,
2334        new_language: Arc<Language>,
2335        cx: &mut ModelContext<Self>,
2336    ) {
2337        buffer.update(cx, |buffer, cx| {
2338            if buffer.language().map_or(true, |old_language| {
2339                !Arc::ptr_eq(old_language, &new_language)
2340            }) {
2341                buffer.set_language(Some(new_language.clone()), cx);
2342            }
2343        });
2344
2345        if let Some(file) = File::from_dyn(buffer.read(cx).file()) {
2346            let worktree = file.worktree.clone();
2347            if let Some(tree) = worktree.read(cx).as_local() {
2348                self.start_language_servers(&worktree, tree.abs_path().clone(), new_language, cx);
2349            }
2350        }
2351    }
2352
2353    fn start_language_servers(
2354        &mut self,
2355        worktree: &ModelHandle<Worktree>,
2356        worktree_path: Arc<Path>,
2357        language: Arc<Language>,
2358        cx: &mut ModelContext<Self>,
2359    ) {
2360        if !language_settings(
2361            Some(&language),
2362            worktree
2363                .update(cx, |tree, cx| tree.root_file(cx))
2364                .map(|f| f as _)
2365                .as_ref(),
2366            cx,
2367        )
2368        .enable_language_server
2369        {
2370            return;
2371        }
2372
2373        let worktree_id = worktree.read(cx).id();
2374        for adapter in language.lsp_adapters() {
2375            let key = (worktree_id, adapter.name.clone());
2376            if self.language_server_ids.contains_key(&key) {
2377                continue;
2378            }
2379
2380            let pending_server = match self.languages.start_language_server(
2381                language.clone(),
2382                adapter.clone(),
2383                worktree_path.clone(),
2384                self.client.http_client(),
2385                cx,
2386            ) {
2387                Some(pending_server) => pending_server,
2388                None => continue,
2389            };
2390
2391            let lsp = settings::get::<ProjectSettings>(cx)
2392                .lsp
2393                .get(&adapter.name.0);
2394            let override_options = lsp.map(|s| s.initialization_options.clone()).flatten();
2395
2396            let mut initialization_options = adapter.initialization_options.clone();
2397            match (&mut initialization_options, override_options) {
2398                (Some(initialization_options), Some(override_options)) => {
2399                    merge_json_value_into(override_options, initialization_options);
2400                }
2401                (None, override_options) => initialization_options = override_options,
2402                _ => {}
2403            }
2404
2405            let server_id = pending_server.server_id;
2406            let state = self.setup_pending_language_server(
2407                initialization_options,
2408                pending_server,
2409                adapter.clone(),
2410                language.clone(),
2411                key.clone(),
2412                cx,
2413            );
2414            self.language_servers.insert(server_id, state);
2415            self.language_server_ids.insert(key.clone(), server_id);
2416        }
2417    }
2418
2419    fn setup_pending_language_server(
2420        &mut self,
2421        initialization_options: Option<serde_json::Value>,
2422        pending_server: PendingLanguageServer,
2423        adapter: Arc<CachedLspAdapter>,
2424        language: Arc<Language>,
2425        key: (WorktreeId, LanguageServerName),
2426        cx: &mut ModelContext<Project>,
2427    ) -> LanguageServerState {
2428        let server_id = pending_server.server_id;
2429        let languages = self.languages.clone();
2430
2431        LanguageServerState::Starting(cx.spawn_weak(|this, mut cx| async move {
2432            let workspace_config = cx.update(|cx| languages.workspace_configuration(cx)).await;
2433            let language_server = pending_server.task.await.log_err()?;
2434            let language_server = language_server
2435                .initialize(initialization_options)
2436                .await
2437                .log_err()?;
2438            let this = this.upgrade(&cx)?;
2439
2440            language_server
2441                .on_notification::<lsp::notification::PublishDiagnostics, _>({
2442                    let this = this.downgrade();
2443                    let adapter = adapter.clone();
2444                    move |mut params, cx| {
2445                        let this = this;
2446                        let adapter = adapter.clone();
2447                        cx.spawn(|mut cx| async move {
2448                            adapter.process_diagnostics(&mut params).await;
2449                            if let Some(this) = this.upgrade(&cx) {
2450                                this.update(&mut cx, |this, cx| {
2451                                    this.update_diagnostics(
2452                                        server_id,
2453                                        params,
2454                                        &adapter.disk_based_diagnostic_sources,
2455                                        cx,
2456                                    )
2457                                    .log_err();
2458                                });
2459                            }
2460                        })
2461                        .detach();
2462                    }
2463                })
2464                .detach();
2465
2466            language_server
2467                .on_request::<lsp::request::WorkspaceConfiguration, _, _>({
2468                    let languages = languages.clone();
2469                    move |params, mut cx| {
2470                        let languages = languages.clone();
2471                        async move {
2472                            let workspace_config =
2473                                cx.update(|cx| languages.workspace_configuration(cx)).await;
2474                            Ok(params
2475                                .items
2476                                .into_iter()
2477                                .map(|item| {
2478                                    if let Some(section) = &item.section {
2479                                        workspace_config
2480                                            .get(section)
2481                                            .cloned()
2482                                            .unwrap_or(serde_json::Value::Null)
2483                                    } else {
2484                                        workspace_config.clone()
2485                                    }
2486                                })
2487                                .collect())
2488                        }
2489                    }
2490                })
2491                .detach();
2492
2493            // Even though we don't have handling for these requests, respond to them to
2494            // avoid stalling any language server like `gopls` which waits for a response
2495            // to these requests when initializing.
2496            language_server
2497                .on_request::<lsp::request::WorkDoneProgressCreate, _, _>({
2498                    let this = this.downgrade();
2499                    move |params, mut cx| async move {
2500                        if let Some(this) = this.upgrade(&cx) {
2501                            this.update(&mut cx, |this, _| {
2502                                if let Some(status) =
2503                                    this.language_server_statuses.get_mut(&server_id)
2504                                {
2505                                    if let lsp::NumberOrString::String(token) = params.token {
2506                                        status.progress_tokens.insert(token);
2507                                    }
2508                                }
2509                            });
2510                        }
2511                        Ok(())
2512                    }
2513                })
2514                .detach();
2515            language_server
2516                .on_request::<lsp::request::RegisterCapability, _, _>({
2517                    let this = this.downgrade();
2518                    move |params, mut cx| async move {
2519                        let this = this
2520                            .upgrade(&cx)
2521                            .ok_or_else(|| anyhow!("project dropped"))?;
2522                        for reg in params.registrations {
2523                            if reg.method == "workspace/didChangeWatchedFiles" {
2524                                if let Some(options) = reg.register_options {
2525                                    let options = serde_json::from_value(options)?;
2526                                    this.update(&mut cx, |this, cx| {
2527                                        this.on_lsp_did_change_watched_files(
2528                                            server_id, options, cx,
2529                                        );
2530                                    });
2531                                }
2532                            }
2533                        }
2534                        Ok(())
2535                    }
2536                })
2537                .detach();
2538
2539            language_server
2540                .on_request::<lsp::request::ApplyWorkspaceEdit, _, _>({
2541                    let this = this.downgrade();
2542                    let adapter = adapter.clone();
2543                    let language_server = language_server.clone();
2544                    move |params, cx| {
2545                        Self::on_lsp_workspace_edit(
2546                            this,
2547                            params,
2548                            server_id,
2549                            adapter.clone(),
2550                            language_server.clone(),
2551                            cx,
2552                        )
2553                    }
2554                })
2555                .detach();
2556
2557            let disk_based_diagnostics_progress_token =
2558                adapter.disk_based_diagnostics_progress_token.clone();
2559
2560            language_server
2561                .on_notification::<lsp::notification::Progress, _>({
2562                    let this = this.downgrade();
2563                    move |params, mut cx| {
2564                        if let Some(this) = this.upgrade(&cx) {
2565                            this.update(&mut cx, |this, cx| {
2566                                this.on_lsp_progress(
2567                                    params,
2568                                    server_id,
2569                                    disk_based_diagnostics_progress_token.clone(),
2570                                    cx,
2571                                );
2572                            });
2573                        }
2574                    }
2575                })
2576                .detach();
2577
2578            language_server
2579                .notify::<lsp::notification::DidChangeConfiguration>(
2580                    lsp::DidChangeConfigurationParams {
2581                        settings: workspace_config,
2582                    },
2583                )
2584                .ok();
2585
2586            this.update(&mut cx, |this, cx| {
2587                // If the language server for this key doesn't match the server id, don't store the
2588                // server. Which will cause it to be dropped, killing the process
2589                if this
2590                    .language_server_ids
2591                    .get(&key)
2592                    .map(|id| id != &server_id)
2593                    .unwrap_or(false)
2594                {
2595                    return None;
2596                }
2597
2598                // Update language_servers collection with Running variant of LanguageServerState
2599                // indicating that the server is up and running and ready
2600                this.language_servers.insert(
2601                    server_id,
2602                    LanguageServerState::Running {
2603                        adapter: adapter.clone(),
2604                        language: language.clone(),
2605                        watched_paths: Default::default(),
2606                        server: language_server.clone(),
2607                        simulate_disk_based_diagnostics_completion: None,
2608                    },
2609                );
2610                this.language_server_statuses.insert(
2611                    server_id,
2612                    LanguageServerStatus {
2613                        name: language_server.name().to_string(),
2614                        pending_work: Default::default(),
2615                        has_pending_diagnostic_updates: false,
2616                        progress_tokens: Default::default(),
2617                    },
2618                );
2619
2620                if let Some(project_id) = this.remote_id() {
2621                    this.client
2622                        .send(proto::StartLanguageServer {
2623                            project_id,
2624                            server: Some(proto::LanguageServer {
2625                                id: server_id.0 as u64,
2626                                name: language_server.name().to_string(),
2627                            }),
2628                        })
2629                        .log_err();
2630                }
2631
2632                // Tell the language server about every open buffer in the worktree that matches the language.
2633                for buffer in this.opened_buffers.values() {
2634                    if let Some(buffer_handle) = buffer.upgrade(cx) {
2635                        let buffer = buffer_handle.read(cx);
2636                        let file = match File::from_dyn(buffer.file()) {
2637                            Some(file) => file,
2638                            None => continue,
2639                        };
2640                        let language = match buffer.language() {
2641                            Some(language) => language,
2642                            None => continue,
2643                        };
2644
2645                        if file.worktree.read(cx).id() != key.0
2646                            || !language.lsp_adapters().iter().any(|a| a.name == key.1)
2647                        {
2648                            continue;
2649                        }
2650
2651                        let file = file.as_local()?;
2652                        let versions = this
2653                            .buffer_snapshots
2654                            .entry(buffer.remote_id())
2655                            .or_default()
2656                            .entry(server_id)
2657                            .or_insert_with(|| {
2658                                vec![LspBufferSnapshot {
2659                                    version: 0,
2660                                    snapshot: buffer.text_snapshot(),
2661                                }]
2662                            });
2663
2664                        let snapshot = versions.last().unwrap();
2665                        let version = snapshot.version;
2666                        let initial_snapshot = &snapshot.snapshot;
2667                        let uri = lsp::Url::from_file_path(file.abs_path(cx)).unwrap();
2668                        language_server
2669                            .notify::<lsp::notification::DidOpenTextDocument>(
2670                                lsp::DidOpenTextDocumentParams {
2671                                    text_document: lsp::TextDocumentItem::new(
2672                                        uri,
2673                                        adapter
2674                                            .language_ids
2675                                            .get(language.name().as_ref())
2676                                            .cloned()
2677                                            .unwrap_or_default(),
2678                                        version,
2679                                        initial_snapshot.text(),
2680                                    ),
2681                                },
2682                            )
2683                            .log_err()?;
2684                        buffer_handle.update(cx, |buffer, cx| {
2685                            buffer.set_completion_triggers(
2686                                language_server
2687                                    .capabilities()
2688                                    .completion_provider
2689                                    .as_ref()
2690                                    .and_then(|provider| provider.trigger_characters.clone())
2691                                    .unwrap_or_default(),
2692                                cx,
2693                            )
2694                        });
2695                    }
2696                }
2697
2698                cx.notify();
2699                Some(language_server)
2700            })
2701        }))
2702    }
2703
2704    // Returns a list of all of the worktrees which no longer have a language server and the root path
2705    // for the stopped server
2706    fn stop_language_server(
2707        &mut self,
2708        worktree_id: WorktreeId,
2709        adapter_name: LanguageServerName,
2710        cx: &mut ModelContext<Self>,
2711    ) -> Task<(Option<PathBuf>, Vec<WorktreeId>)> {
2712        let key = (worktree_id, adapter_name);
2713        if let Some(server_id) = self.language_server_ids.remove(&key) {
2714            // Remove other entries for this language server as well
2715            let mut orphaned_worktrees = vec![worktree_id];
2716            let other_keys = self.language_server_ids.keys().cloned().collect::<Vec<_>>();
2717            for other_key in other_keys {
2718                if self.language_server_ids.get(&other_key) == Some(&server_id) {
2719                    self.language_server_ids.remove(&other_key);
2720                    orphaned_worktrees.push(other_key.0);
2721                }
2722            }
2723
2724            for buffer in self.opened_buffers.values() {
2725                if let Some(buffer) = buffer.upgrade(cx) {
2726                    buffer.update(cx, |buffer, cx| {
2727                        buffer.update_diagnostics(server_id, Default::default(), cx);
2728                    });
2729                }
2730            }
2731            for worktree in &self.worktrees {
2732                if let Some(worktree) = worktree.upgrade(cx) {
2733                    worktree.update(cx, |worktree, cx| {
2734                        if let Some(worktree) = worktree.as_local_mut() {
2735                            worktree.clear_diagnostics_for_language_server(server_id, cx);
2736                        }
2737                    });
2738                }
2739            }
2740
2741            self.language_server_statuses.remove(&server_id);
2742            cx.notify();
2743
2744            let server_state = self.language_servers.remove(&server_id);
2745            cx.spawn_weak(|this, mut cx| async move {
2746                let mut root_path = None;
2747
2748                let server = match server_state {
2749                    Some(LanguageServerState::Starting(started_language_server)) => {
2750                        started_language_server.await
2751                    }
2752                    Some(LanguageServerState::Running { server, .. }) => Some(server),
2753                    None => None,
2754                };
2755
2756                if let Some(server) = server {
2757                    root_path = Some(server.root_path().clone());
2758                    if let Some(shutdown) = server.shutdown() {
2759                        shutdown.await;
2760                    }
2761                }
2762
2763                if let Some(this) = this.upgrade(&cx) {
2764                    this.update(&mut cx, |this, cx| {
2765                        this.language_server_statuses.remove(&server_id);
2766                        cx.notify();
2767                    });
2768                }
2769
2770                (root_path, orphaned_worktrees)
2771            })
2772        } else {
2773            Task::ready((None, Vec::new()))
2774        }
2775    }
2776
2777    pub fn restart_language_servers_for_buffers(
2778        &mut self,
2779        buffers: impl IntoIterator<Item = ModelHandle<Buffer>>,
2780        cx: &mut ModelContext<Self>,
2781    ) -> Option<()> {
2782        let language_server_lookup_info: HashSet<(ModelHandle<Worktree>, Arc<Language>)> = buffers
2783            .into_iter()
2784            .filter_map(|buffer| {
2785                let buffer = buffer.read(cx);
2786                let file = File::from_dyn(buffer.file())?;
2787                let full_path = file.full_path(cx);
2788                let language = self
2789                    .languages
2790                    .language_for_file(&full_path, Some(buffer.as_rope()))
2791                    .now_or_never()?
2792                    .ok()?;
2793                Some((file.worktree.clone(), language))
2794            })
2795            .collect();
2796        for (worktree, language) in language_server_lookup_info {
2797            self.restart_language_servers(worktree, language, cx);
2798        }
2799
2800        None
2801    }
2802
2803    // TODO This will break in the case where the adapter's root paths and worktrees are not equal
2804    fn restart_language_servers(
2805        &mut self,
2806        worktree: ModelHandle<Worktree>,
2807        language: Arc<Language>,
2808        cx: &mut ModelContext<Self>,
2809    ) {
2810        let worktree_id = worktree.read(cx).id();
2811        let fallback_path = worktree.read(cx).abs_path();
2812
2813        let mut stops = Vec::new();
2814        for adapter in language.lsp_adapters() {
2815            stops.push(self.stop_language_server(worktree_id, adapter.name.clone(), cx));
2816        }
2817
2818        if stops.is_empty() {
2819            return;
2820        }
2821        let mut stops = stops.into_iter();
2822
2823        cx.spawn_weak(|this, mut cx| async move {
2824            let (original_root_path, mut orphaned_worktrees) = stops.next().unwrap().await;
2825            for stop in stops {
2826                let (_, worktrees) = stop.await;
2827                orphaned_worktrees.extend_from_slice(&worktrees);
2828            }
2829
2830            let this = match this.upgrade(&cx) {
2831                Some(this) => this,
2832                None => return,
2833            };
2834
2835            this.update(&mut cx, |this, cx| {
2836                // Attempt to restart using original server path. Fallback to passed in
2837                // path if we could not retrieve the root path
2838                let root_path = original_root_path
2839                    .map(|path_buf| Arc::from(path_buf.as_path()))
2840                    .unwrap_or(fallback_path);
2841
2842                this.start_language_servers(&worktree, root_path, language.clone(), cx);
2843
2844                // Lookup new server ids and set them for each of the orphaned worktrees
2845                for adapter in language.lsp_adapters() {
2846                    if let Some(new_server_id) = this
2847                        .language_server_ids
2848                        .get(&(worktree_id, adapter.name.clone()))
2849                        .cloned()
2850                    {
2851                        for &orphaned_worktree in &orphaned_worktrees {
2852                            this.language_server_ids
2853                                .insert((orphaned_worktree, adapter.name.clone()), new_server_id);
2854                        }
2855                    }
2856                }
2857            });
2858        })
2859        .detach();
2860    }
2861
2862    fn on_lsp_progress(
2863        &mut self,
2864        progress: lsp::ProgressParams,
2865        language_server_id: LanguageServerId,
2866        disk_based_diagnostics_progress_token: Option<String>,
2867        cx: &mut ModelContext<Self>,
2868    ) {
2869        let token = match progress.token {
2870            lsp::NumberOrString::String(token) => token,
2871            lsp::NumberOrString::Number(token) => {
2872                log::info!("skipping numeric progress token {}", token);
2873                return;
2874            }
2875        };
2876        let lsp::ProgressParamsValue::WorkDone(progress) = progress.value;
2877        let language_server_status =
2878            if let Some(status) = self.language_server_statuses.get_mut(&language_server_id) {
2879                status
2880            } else {
2881                return;
2882            };
2883
2884        if !language_server_status.progress_tokens.contains(&token) {
2885            return;
2886        }
2887
2888        let is_disk_based_diagnostics_progress = disk_based_diagnostics_progress_token
2889            .as_ref()
2890            .map_or(false, |disk_based_token| {
2891                token.starts_with(disk_based_token)
2892            });
2893
2894        match progress {
2895            lsp::WorkDoneProgress::Begin(report) => {
2896                if is_disk_based_diagnostics_progress {
2897                    language_server_status.has_pending_diagnostic_updates = true;
2898                    self.disk_based_diagnostics_started(language_server_id, cx);
2899                    self.buffer_ordered_messages_tx
2900                        .unbounded_send(BufferOrderedMessage::LanguageServerUpdate {
2901                            language_server_id,
2902                            message: proto::update_language_server::Variant::DiskBasedDiagnosticsUpdating(Default::default())
2903                        })
2904                        .ok();
2905                } else {
2906                    self.on_lsp_work_start(
2907                        language_server_id,
2908                        token.clone(),
2909                        LanguageServerProgress {
2910                            message: report.message.clone(),
2911                            percentage: report.percentage.map(|p| p as usize),
2912                            last_update_at: Instant::now(),
2913                        },
2914                        cx,
2915                    );
2916                    self.buffer_ordered_messages_tx
2917                        .unbounded_send(BufferOrderedMessage::LanguageServerUpdate {
2918                            language_server_id,
2919                            message: proto::update_language_server::Variant::WorkStart(
2920                                proto::LspWorkStart {
2921                                    token,
2922                                    message: report.message,
2923                                    percentage: report.percentage.map(|p| p as u32),
2924                                },
2925                            ),
2926                        })
2927                        .ok();
2928                }
2929            }
2930            lsp::WorkDoneProgress::Report(report) => {
2931                if !is_disk_based_diagnostics_progress {
2932                    self.on_lsp_work_progress(
2933                        language_server_id,
2934                        token.clone(),
2935                        LanguageServerProgress {
2936                            message: report.message.clone(),
2937                            percentage: report.percentage.map(|p| p as usize),
2938                            last_update_at: Instant::now(),
2939                        },
2940                        cx,
2941                    );
2942                    self.buffer_ordered_messages_tx
2943                        .unbounded_send(BufferOrderedMessage::LanguageServerUpdate {
2944                            language_server_id,
2945                            message: proto::update_language_server::Variant::WorkProgress(
2946                                proto::LspWorkProgress {
2947                                    token,
2948                                    message: report.message,
2949                                    percentage: report.percentage.map(|p| p as u32),
2950                                },
2951                            ),
2952                        })
2953                        .ok();
2954                }
2955            }
2956            lsp::WorkDoneProgress::End(_) => {
2957                language_server_status.progress_tokens.remove(&token);
2958
2959                if is_disk_based_diagnostics_progress {
2960                    language_server_status.has_pending_diagnostic_updates = false;
2961                    self.disk_based_diagnostics_finished(language_server_id, cx);
2962                    self.buffer_ordered_messages_tx
2963                        .unbounded_send(BufferOrderedMessage::LanguageServerUpdate {
2964                            language_server_id,
2965                            message:
2966                                proto::update_language_server::Variant::DiskBasedDiagnosticsUpdated(
2967                                    Default::default(),
2968                                ),
2969                        })
2970                        .ok();
2971                } else {
2972                    self.on_lsp_work_end(language_server_id, token.clone(), cx);
2973                    self.buffer_ordered_messages_tx
2974                        .unbounded_send(BufferOrderedMessage::LanguageServerUpdate {
2975                            language_server_id,
2976                            message: proto::update_language_server::Variant::WorkEnd(
2977                                proto::LspWorkEnd { token },
2978                            ),
2979                        })
2980                        .ok();
2981                }
2982            }
2983        }
2984    }
2985
2986    fn on_lsp_work_start(
2987        &mut self,
2988        language_server_id: LanguageServerId,
2989        token: String,
2990        progress: LanguageServerProgress,
2991        cx: &mut ModelContext<Self>,
2992    ) {
2993        if let Some(status) = self.language_server_statuses.get_mut(&language_server_id) {
2994            status.pending_work.insert(token, progress);
2995            cx.notify();
2996        }
2997    }
2998
2999    fn on_lsp_work_progress(
3000        &mut self,
3001        language_server_id: LanguageServerId,
3002        token: String,
3003        progress: LanguageServerProgress,
3004        cx: &mut ModelContext<Self>,
3005    ) {
3006        if let Some(status) = self.language_server_statuses.get_mut(&language_server_id) {
3007            let entry = status
3008                .pending_work
3009                .entry(token)
3010                .or_insert(LanguageServerProgress {
3011                    message: Default::default(),
3012                    percentage: Default::default(),
3013                    last_update_at: progress.last_update_at,
3014                });
3015            if progress.message.is_some() {
3016                entry.message = progress.message;
3017            }
3018            if progress.percentage.is_some() {
3019                entry.percentage = progress.percentage;
3020            }
3021            entry.last_update_at = progress.last_update_at;
3022            cx.notify();
3023        }
3024    }
3025
3026    fn on_lsp_work_end(
3027        &mut self,
3028        language_server_id: LanguageServerId,
3029        token: String,
3030        cx: &mut ModelContext<Self>,
3031    ) {
3032        if let Some(status) = self.language_server_statuses.get_mut(&language_server_id) {
3033            status.pending_work.remove(&token);
3034            cx.notify();
3035        }
3036    }
3037
3038    fn on_lsp_did_change_watched_files(
3039        &mut self,
3040        language_server_id: LanguageServerId,
3041        params: DidChangeWatchedFilesRegistrationOptions,
3042        cx: &mut ModelContext<Self>,
3043    ) {
3044        if let Some(LanguageServerState::Running { watched_paths, .. }) =
3045            self.language_servers.get_mut(&language_server_id)
3046        {
3047            let mut builders = HashMap::default();
3048            for watcher in params.watchers {
3049                for worktree in &self.worktrees {
3050                    if let Some(worktree) = worktree.upgrade(cx) {
3051                        let worktree = worktree.read(cx);
3052                        if let Some(abs_path) = worktree.abs_path().to_str() {
3053                            if let Some(suffix) = watcher
3054                                .glob_pattern
3055                                .strip_prefix(abs_path)
3056                                .and_then(|s| s.strip_prefix(std::path::MAIN_SEPARATOR))
3057                            {
3058                                if let Some(glob) = Glob::new(suffix).log_err() {
3059                                    builders
3060                                        .entry(worktree.id())
3061                                        .or_insert_with(|| GlobSetBuilder::new())
3062                                        .add(glob);
3063                                }
3064                                break;
3065                            }
3066                        }
3067                    }
3068                }
3069            }
3070
3071            watched_paths.clear();
3072            for (worktree_id, builder) in builders {
3073                if let Ok(globset) = builder.build() {
3074                    watched_paths.insert(worktree_id, globset);
3075                }
3076            }
3077
3078            cx.notify();
3079        }
3080    }
3081
3082    async fn on_lsp_workspace_edit(
3083        this: WeakModelHandle<Self>,
3084        params: lsp::ApplyWorkspaceEditParams,
3085        server_id: LanguageServerId,
3086        adapter: Arc<CachedLspAdapter>,
3087        language_server: Arc<LanguageServer>,
3088        mut cx: AsyncAppContext,
3089    ) -> Result<lsp::ApplyWorkspaceEditResponse> {
3090        let this = this
3091            .upgrade(&cx)
3092            .ok_or_else(|| anyhow!("project project closed"))?;
3093        let transaction = Self::deserialize_workspace_edit(
3094            this.clone(),
3095            params.edit,
3096            true,
3097            adapter.clone(),
3098            language_server.clone(),
3099            &mut cx,
3100        )
3101        .await
3102        .log_err();
3103        this.update(&mut cx, |this, _| {
3104            if let Some(transaction) = transaction {
3105                this.last_workspace_edits_by_language_server
3106                    .insert(server_id, transaction);
3107            }
3108        });
3109        Ok(lsp::ApplyWorkspaceEditResponse {
3110            applied: true,
3111            failed_change: None,
3112            failure_reason: None,
3113        })
3114    }
3115
3116    pub fn language_server_statuses(
3117        &self,
3118    ) -> impl DoubleEndedIterator<Item = &LanguageServerStatus> {
3119        self.language_server_statuses.values()
3120    }
3121
3122    pub fn update_diagnostics(
3123        &mut self,
3124        language_server_id: LanguageServerId,
3125        mut params: lsp::PublishDiagnosticsParams,
3126        disk_based_sources: &[String],
3127        cx: &mut ModelContext<Self>,
3128    ) -> Result<()> {
3129        let abs_path = params
3130            .uri
3131            .to_file_path()
3132            .map_err(|_| anyhow!("URI is not a file"))?;
3133        let mut diagnostics = Vec::default();
3134        let mut primary_diagnostic_group_ids = HashMap::default();
3135        let mut sources_by_group_id = HashMap::default();
3136        let mut supporting_diagnostics = HashMap::default();
3137
3138        // Ensure that primary diagnostics are always the most severe
3139        params.diagnostics.sort_by_key(|item| item.severity);
3140
3141        for diagnostic in &params.diagnostics {
3142            let source = diagnostic.source.as_ref();
3143            let code = diagnostic.code.as_ref().map(|code| match code {
3144                lsp::NumberOrString::Number(code) => code.to_string(),
3145                lsp::NumberOrString::String(code) => code.clone(),
3146            });
3147            let range = range_from_lsp(diagnostic.range);
3148            let is_supporting = diagnostic
3149                .related_information
3150                .as_ref()
3151                .map_or(false, |infos| {
3152                    infos.iter().any(|info| {
3153                        primary_diagnostic_group_ids.contains_key(&(
3154                            source,
3155                            code.clone(),
3156                            range_from_lsp(info.location.range),
3157                        ))
3158                    })
3159                });
3160
3161            let is_unnecessary = diagnostic.tags.as_ref().map_or(false, |tags| {
3162                tags.iter().any(|tag| *tag == DiagnosticTag::UNNECESSARY)
3163            });
3164
3165            if is_supporting {
3166                supporting_diagnostics.insert(
3167                    (source, code.clone(), range),
3168                    (diagnostic.severity, is_unnecessary),
3169                );
3170            } else {
3171                let group_id = post_inc(&mut self.next_diagnostic_group_id);
3172                let is_disk_based =
3173                    source.map_or(false, |source| disk_based_sources.contains(source));
3174
3175                sources_by_group_id.insert(group_id, source);
3176                primary_diagnostic_group_ids
3177                    .insert((source, code.clone(), range.clone()), group_id);
3178
3179                diagnostics.push(DiagnosticEntry {
3180                    range,
3181                    diagnostic: Diagnostic {
3182                        source: diagnostic.source.clone(),
3183                        code: code.clone(),
3184                        severity: diagnostic.severity.unwrap_or(DiagnosticSeverity::ERROR),
3185                        message: diagnostic.message.clone(),
3186                        group_id,
3187                        is_primary: true,
3188                        is_valid: true,
3189                        is_disk_based,
3190                        is_unnecessary,
3191                    },
3192                });
3193                if let Some(infos) = &diagnostic.related_information {
3194                    for info in infos {
3195                        if info.location.uri == params.uri && !info.message.is_empty() {
3196                            let range = range_from_lsp(info.location.range);
3197                            diagnostics.push(DiagnosticEntry {
3198                                range,
3199                                diagnostic: Diagnostic {
3200                                    source: diagnostic.source.clone(),
3201                                    code: code.clone(),
3202                                    severity: DiagnosticSeverity::INFORMATION,
3203                                    message: info.message.clone(),
3204                                    group_id,
3205                                    is_primary: false,
3206                                    is_valid: true,
3207                                    is_disk_based,
3208                                    is_unnecessary: false,
3209                                },
3210                            });
3211                        }
3212                    }
3213                }
3214            }
3215        }
3216
3217        for entry in &mut diagnostics {
3218            let diagnostic = &mut entry.diagnostic;
3219            if !diagnostic.is_primary {
3220                let source = *sources_by_group_id.get(&diagnostic.group_id).unwrap();
3221                if let Some(&(severity, is_unnecessary)) = supporting_diagnostics.get(&(
3222                    source,
3223                    diagnostic.code.clone(),
3224                    entry.range.clone(),
3225                )) {
3226                    if let Some(severity) = severity {
3227                        diagnostic.severity = severity;
3228                    }
3229                    diagnostic.is_unnecessary = is_unnecessary;
3230                }
3231            }
3232        }
3233
3234        self.update_diagnostic_entries(
3235            language_server_id,
3236            abs_path,
3237            params.version,
3238            diagnostics,
3239            cx,
3240        )?;
3241        Ok(())
3242    }
3243
3244    pub fn update_diagnostic_entries(
3245        &mut self,
3246        server_id: LanguageServerId,
3247        abs_path: PathBuf,
3248        version: Option<i32>,
3249        diagnostics: Vec<DiagnosticEntry<Unclipped<PointUtf16>>>,
3250        cx: &mut ModelContext<Project>,
3251    ) -> Result<(), anyhow::Error> {
3252        let (worktree, relative_path) = self
3253            .find_local_worktree(&abs_path, cx)
3254            .ok_or_else(|| anyhow!("no worktree found for diagnostics path {abs_path:?}"))?;
3255
3256        let project_path = ProjectPath {
3257            worktree_id: worktree.read(cx).id(),
3258            path: relative_path.into(),
3259        };
3260
3261        if let Some(buffer) = self.get_open_buffer(&project_path, cx) {
3262            self.update_buffer_diagnostics(&buffer, server_id, version, diagnostics.clone(), cx)?;
3263        }
3264
3265        let updated = worktree.update(cx, |worktree, cx| {
3266            worktree
3267                .as_local_mut()
3268                .ok_or_else(|| anyhow!("not a local worktree"))?
3269                .update_diagnostics(server_id, project_path.path.clone(), diagnostics, cx)
3270        })?;
3271        if updated {
3272            cx.emit(Event::DiagnosticsUpdated {
3273                language_server_id: server_id,
3274                path: project_path,
3275            });
3276        }
3277        Ok(())
3278    }
3279
3280    fn update_buffer_diagnostics(
3281        &mut self,
3282        buffer: &ModelHandle<Buffer>,
3283        server_id: LanguageServerId,
3284        version: Option<i32>,
3285        mut diagnostics: Vec<DiagnosticEntry<Unclipped<PointUtf16>>>,
3286        cx: &mut ModelContext<Self>,
3287    ) -> Result<()> {
3288        fn compare_diagnostics(a: &Diagnostic, b: &Diagnostic) -> Ordering {
3289            Ordering::Equal
3290                .then_with(|| b.is_primary.cmp(&a.is_primary))
3291                .then_with(|| a.is_disk_based.cmp(&b.is_disk_based))
3292                .then_with(|| a.severity.cmp(&b.severity))
3293                .then_with(|| a.message.cmp(&b.message))
3294        }
3295
3296        let snapshot = self.buffer_snapshot_for_lsp_version(buffer, server_id, version, cx)?;
3297
3298        diagnostics.sort_unstable_by(|a, b| {
3299            Ordering::Equal
3300                .then_with(|| a.range.start.cmp(&b.range.start))
3301                .then_with(|| b.range.end.cmp(&a.range.end))
3302                .then_with(|| compare_diagnostics(&a.diagnostic, &b.diagnostic))
3303        });
3304
3305        let mut sanitized_diagnostics = Vec::new();
3306        let edits_since_save = Patch::new(
3307            snapshot
3308                .edits_since::<Unclipped<PointUtf16>>(buffer.read(cx).saved_version())
3309                .collect(),
3310        );
3311        for entry in diagnostics {
3312            let start;
3313            let end;
3314            if entry.diagnostic.is_disk_based {
3315                // Some diagnostics are based on files on disk instead of buffers'
3316                // current contents. Adjust these diagnostics' ranges to reflect
3317                // any unsaved edits.
3318                start = edits_since_save.old_to_new(entry.range.start);
3319                end = edits_since_save.old_to_new(entry.range.end);
3320            } else {
3321                start = entry.range.start;
3322                end = entry.range.end;
3323            }
3324
3325            let mut range = snapshot.clip_point_utf16(start, Bias::Left)
3326                ..snapshot.clip_point_utf16(end, Bias::Right);
3327
3328            // Expand empty ranges by one codepoint
3329            if range.start == range.end {
3330                // This will be go to the next boundary when being clipped
3331                range.end.column += 1;
3332                range.end = snapshot.clip_point_utf16(Unclipped(range.end), Bias::Right);
3333                if range.start == range.end && range.end.column > 0 {
3334                    range.start.column -= 1;
3335                    range.end = snapshot.clip_point_utf16(Unclipped(range.end), Bias::Left);
3336                }
3337            }
3338
3339            sanitized_diagnostics.push(DiagnosticEntry {
3340                range,
3341                diagnostic: entry.diagnostic,
3342            });
3343        }
3344        drop(edits_since_save);
3345
3346        let set = DiagnosticSet::new(sanitized_diagnostics, &snapshot);
3347        buffer.update(cx, |buffer, cx| {
3348            buffer.update_diagnostics(server_id, set, cx)
3349        });
3350        Ok(())
3351    }
3352
3353    pub fn reload_buffers(
3354        &self,
3355        buffers: HashSet<ModelHandle<Buffer>>,
3356        push_to_history: bool,
3357        cx: &mut ModelContext<Self>,
3358    ) -> Task<Result<ProjectTransaction>> {
3359        let mut local_buffers = Vec::new();
3360        let mut remote_buffers = None;
3361        for buffer_handle in buffers {
3362            let buffer = buffer_handle.read(cx);
3363            if buffer.is_dirty() {
3364                if let Some(file) = File::from_dyn(buffer.file()) {
3365                    if file.is_local() {
3366                        local_buffers.push(buffer_handle);
3367                    } else {
3368                        remote_buffers.get_or_insert(Vec::new()).push(buffer_handle);
3369                    }
3370                }
3371            }
3372        }
3373
3374        let remote_buffers = self.remote_id().zip(remote_buffers);
3375        let client = self.client.clone();
3376
3377        cx.spawn(|this, mut cx| async move {
3378            let mut project_transaction = ProjectTransaction::default();
3379
3380            if let Some((project_id, remote_buffers)) = remote_buffers {
3381                let response = client
3382                    .request(proto::ReloadBuffers {
3383                        project_id,
3384                        buffer_ids: remote_buffers
3385                            .iter()
3386                            .map(|buffer| buffer.read_with(&cx, |buffer, _| buffer.remote_id()))
3387                            .collect(),
3388                    })
3389                    .await?
3390                    .transaction
3391                    .ok_or_else(|| anyhow!("missing transaction"))?;
3392                project_transaction = this
3393                    .update(&mut cx, |this, cx| {
3394                        this.deserialize_project_transaction(response, push_to_history, cx)
3395                    })
3396                    .await?;
3397            }
3398
3399            for buffer in local_buffers {
3400                let transaction = buffer
3401                    .update(&mut cx, |buffer, cx| buffer.reload(cx))
3402                    .await?;
3403                buffer.update(&mut cx, |buffer, cx| {
3404                    if let Some(transaction) = transaction {
3405                        if !push_to_history {
3406                            buffer.forget_transaction(transaction.id);
3407                        }
3408                        project_transaction.0.insert(cx.handle(), transaction);
3409                    }
3410                });
3411            }
3412
3413            Ok(project_transaction)
3414        })
3415    }
3416
3417    pub fn format(
3418        &self,
3419        buffers: HashSet<ModelHandle<Buffer>>,
3420        push_to_history: bool,
3421        trigger: FormatTrigger,
3422        cx: &mut ModelContext<Project>,
3423    ) -> Task<Result<ProjectTransaction>> {
3424        if self.is_local() {
3425            let mut buffers_with_paths_and_servers = buffers
3426                .into_iter()
3427                .filter_map(|buffer_handle| {
3428                    let buffer = buffer_handle.read(cx);
3429                    let file = File::from_dyn(buffer.file())?;
3430                    let buffer_abs_path = file.as_local().map(|f| f.abs_path(cx));
3431                    let server = self
3432                        .primary_language_servers_for_buffer(buffer, cx)
3433                        .map(|s| s.1.clone());
3434                    Some((buffer_handle, buffer_abs_path, server))
3435                })
3436                .collect::<Vec<_>>();
3437
3438            cx.spawn(|this, mut cx| async move {
3439                // Do not allow multiple concurrent formatting requests for the
3440                // same buffer.
3441                this.update(&mut cx, |this, cx| {
3442                    buffers_with_paths_and_servers.retain(|(buffer, _, _)| {
3443                        this.buffers_being_formatted
3444                            .insert(buffer.read(cx).remote_id())
3445                    });
3446                });
3447
3448                let _cleanup = defer({
3449                    let this = this.clone();
3450                    let mut cx = cx.clone();
3451                    let buffers = &buffers_with_paths_and_servers;
3452                    move || {
3453                        this.update(&mut cx, |this, cx| {
3454                            for (buffer, _, _) in buffers {
3455                                this.buffers_being_formatted
3456                                    .remove(&buffer.read(cx).remote_id());
3457                            }
3458                        });
3459                    }
3460                });
3461
3462                let mut project_transaction = ProjectTransaction::default();
3463                for (buffer, buffer_abs_path, language_server) in &buffers_with_paths_and_servers {
3464                    let settings = buffer.read_with(&cx, |buffer, cx| {
3465                        language_settings(buffer.language(), buffer.file(), cx).clone()
3466                    });
3467
3468                    let remove_trailing_whitespace = settings.remove_trailing_whitespace_on_save;
3469                    let ensure_final_newline = settings.ensure_final_newline_on_save;
3470                    let format_on_save = settings.format_on_save.clone();
3471                    let formatter = settings.formatter.clone();
3472                    let tab_size = settings.tab_size;
3473
3474                    // First, format buffer's whitespace according to the settings.
3475                    let trailing_whitespace_diff = if remove_trailing_whitespace {
3476                        Some(
3477                            buffer
3478                                .read_with(&cx, |b, cx| b.remove_trailing_whitespace(cx))
3479                                .await,
3480                        )
3481                    } else {
3482                        None
3483                    };
3484                    let whitespace_transaction_id = buffer.update(&mut cx, |buffer, cx| {
3485                        buffer.finalize_last_transaction();
3486                        buffer.start_transaction();
3487                        if let Some(diff) = trailing_whitespace_diff {
3488                            buffer.apply_diff(diff, cx);
3489                        }
3490                        if ensure_final_newline {
3491                            buffer.ensure_final_newline(cx);
3492                        }
3493                        buffer.end_transaction(cx)
3494                    });
3495
3496                    // Currently, formatting operations are represented differently depending on
3497                    // whether they come from a language server or an external command.
3498                    enum FormatOperation {
3499                        Lsp(Vec<(Range<Anchor>, String)>),
3500                        External(Diff),
3501                    }
3502
3503                    // Apply language-specific formatting using either a language server
3504                    // or external command.
3505                    let mut format_operation = None;
3506                    match (formatter, format_on_save) {
3507                        (_, FormatOnSave::Off) if trigger == FormatTrigger::Save => {}
3508
3509                        (Formatter::LanguageServer, FormatOnSave::On | FormatOnSave::Off)
3510                        | (_, FormatOnSave::LanguageServer) => {
3511                            if let Some((language_server, buffer_abs_path)) =
3512                                language_server.as_ref().zip(buffer_abs_path.as_ref())
3513                            {
3514                                format_operation = Some(FormatOperation::Lsp(
3515                                    Self::format_via_lsp(
3516                                        &this,
3517                                        &buffer,
3518                                        buffer_abs_path,
3519                                        &language_server,
3520                                        tab_size,
3521                                        &mut cx,
3522                                    )
3523                                    .await
3524                                    .context("failed to format via language server")?,
3525                                ));
3526                            }
3527                        }
3528
3529                        (
3530                            Formatter::External { command, arguments },
3531                            FormatOnSave::On | FormatOnSave::Off,
3532                        )
3533                        | (_, FormatOnSave::External { command, arguments }) => {
3534                            if let Some(buffer_abs_path) = buffer_abs_path {
3535                                format_operation = Self::format_via_external_command(
3536                                    &buffer,
3537                                    &buffer_abs_path,
3538                                    &command,
3539                                    &arguments,
3540                                    &mut cx,
3541                                )
3542                                .await
3543                                .context(format!(
3544                                    "failed to format via external command {:?}",
3545                                    command
3546                                ))?
3547                                .map(FormatOperation::External);
3548                            }
3549                        }
3550                    };
3551
3552                    buffer.update(&mut cx, |b, cx| {
3553                        // If the buffer had its whitespace formatted and was edited while the language-specific
3554                        // formatting was being computed, avoid applying the language-specific formatting, because
3555                        // it can't be grouped with the whitespace formatting in the undo history.
3556                        if let Some(transaction_id) = whitespace_transaction_id {
3557                            if b.peek_undo_stack()
3558                                .map_or(true, |e| e.transaction_id() != transaction_id)
3559                            {
3560                                format_operation.take();
3561                            }
3562                        }
3563
3564                        // Apply any language-specific formatting, and group the two formatting operations
3565                        // in the buffer's undo history.
3566                        if let Some(operation) = format_operation {
3567                            match operation {
3568                                FormatOperation::Lsp(edits) => {
3569                                    b.edit(edits, None, cx);
3570                                }
3571                                FormatOperation::External(diff) => {
3572                                    b.apply_diff(diff, cx);
3573                                }
3574                            }
3575
3576                            if let Some(transaction_id) = whitespace_transaction_id {
3577                                b.group_until_transaction(transaction_id);
3578                            }
3579                        }
3580
3581                        if let Some(transaction) = b.finalize_last_transaction().cloned() {
3582                            if !push_to_history {
3583                                b.forget_transaction(transaction.id);
3584                            }
3585                            project_transaction.0.insert(buffer.clone(), transaction);
3586                        }
3587                    });
3588                }
3589
3590                Ok(project_transaction)
3591            })
3592        } else {
3593            let remote_id = self.remote_id();
3594            let client = self.client.clone();
3595            cx.spawn(|this, mut cx| async move {
3596                let mut project_transaction = ProjectTransaction::default();
3597                if let Some(project_id) = remote_id {
3598                    let response = client
3599                        .request(proto::FormatBuffers {
3600                            project_id,
3601                            trigger: trigger as i32,
3602                            buffer_ids: buffers
3603                                .iter()
3604                                .map(|buffer| buffer.read_with(&cx, |buffer, _| buffer.remote_id()))
3605                                .collect(),
3606                        })
3607                        .await?
3608                        .transaction
3609                        .ok_or_else(|| anyhow!("missing transaction"))?;
3610                    project_transaction = this
3611                        .update(&mut cx, |this, cx| {
3612                            this.deserialize_project_transaction(response, push_to_history, cx)
3613                        })
3614                        .await?;
3615                }
3616                Ok(project_transaction)
3617            })
3618        }
3619    }
3620
3621    async fn format_via_lsp(
3622        this: &ModelHandle<Self>,
3623        buffer: &ModelHandle<Buffer>,
3624        abs_path: &Path,
3625        language_server: &Arc<LanguageServer>,
3626        tab_size: NonZeroU32,
3627        cx: &mut AsyncAppContext,
3628    ) -> Result<Vec<(Range<Anchor>, String)>> {
3629        let text_document =
3630            lsp::TextDocumentIdentifier::new(lsp::Url::from_file_path(abs_path).unwrap());
3631        let capabilities = &language_server.capabilities();
3632        let lsp_edits = if capabilities
3633            .document_formatting_provider
3634            .as_ref()
3635            .map_or(false, |provider| *provider != lsp::OneOf::Left(false))
3636        {
3637            language_server
3638                .request::<lsp::request::Formatting>(lsp::DocumentFormattingParams {
3639                    text_document,
3640                    options: lsp_command::lsp_formatting_options(tab_size.get()),
3641                    work_done_progress_params: Default::default(),
3642                })
3643                .await?
3644        } else if capabilities
3645            .document_range_formatting_provider
3646            .as_ref()
3647            .map_or(false, |provider| *provider != lsp::OneOf::Left(false))
3648        {
3649            let buffer_start = lsp::Position::new(0, 0);
3650            let buffer_end =
3651                buffer.read_with(cx, |buffer, _| point_to_lsp(buffer.max_point_utf16()));
3652            language_server
3653                .request::<lsp::request::RangeFormatting>(lsp::DocumentRangeFormattingParams {
3654                    text_document,
3655                    range: lsp::Range::new(buffer_start, buffer_end),
3656                    options: lsp_command::lsp_formatting_options(tab_size.get()),
3657                    work_done_progress_params: Default::default(),
3658                })
3659                .await?
3660        } else {
3661            None
3662        };
3663
3664        if let Some(lsp_edits) = lsp_edits {
3665            this.update(cx, |this, cx| {
3666                this.edits_from_lsp(buffer, lsp_edits, language_server.server_id(), None, cx)
3667            })
3668            .await
3669        } else {
3670            Ok(Default::default())
3671        }
3672    }
3673
3674    async fn format_via_external_command(
3675        buffer: &ModelHandle<Buffer>,
3676        buffer_abs_path: &Path,
3677        command: &str,
3678        arguments: &[String],
3679        cx: &mut AsyncAppContext,
3680    ) -> Result<Option<Diff>> {
3681        let working_dir_path = buffer.read_with(cx, |buffer, cx| {
3682            let file = File::from_dyn(buffer.file())?;
3683            let worktree = file.worktree.read(cx).as_local()?;
3684            let mut worktree_path = worktree.abs_path().to_path_buf();
3685            if worktree.root_entry()?.is_file() {
3686                worktree_path.pop();
3687            }
3688            Some(worktree_path)
3689        });
3690
3691        if let Some(working_dir_path) = working_dir_path {
3692            let mut child =
3693                smol::process::Command::new(command)
3694                    .args(arguments.iter().map(|arg| {
3695                        arg.replace("{buffer_path}", &buffer_abs_path.to_string_lossy())
3696                    }))
3697                    .current_dir(&working_dir_path)
3698                    .stdin(smol::process::Stdio::piped())
3699                    .stdout(smol::process::Stdio::piped())
3700                    .stderr(smol::process::Stdio::piped())
3701                    .spawn()?;
3702            let stdin = child
3703                .stdin
3704                .as_mut()
3705                .ok_or_else(|| anyhow!("failed to acquire stdin"))?;
3706            let text = buffer.read_with(cx, |buffer, _| buffer.as_rope().clone());
3707            for chunk in text.chunks() {
3708                stdin.write_all(chunk.as_bytes()).await?;
3709            }
3710            stdin.flush().await?;
3711
3712            let output = child.output().await?;
3713            if !output.status.success() {
3714                return Err(anyhow!(
3715                    "command failed with exit code {:?}:\nstdout: {}\nstderr: {}",
3716                    output.status.code(),
3717                    String::from_utf8_lossy(&output.stdout),
3718                    String::from_utf8_lossy(&output.stderr),
3719                ));
3720            }
3721
3722            let stdout = String::from_utf8(output.stdout)?;
3723            Ok(Some(
3724                buffer
3725                    .read_with(cx, |buffer, cx| buffer.diff(stdout, cx))
3726                    .await,
3727            ))
3728        } else {
3729            Ok(None)
3730        }
3731    }
3732
3733    pub fn definition<T: ToPointUtf16>(
3734        &self,
3735        buffer: &ModelHandle<Buffer>,
3736        position: T,
3737        cx: &mut ModelContext<Self>,
3738    ) -> Task<Result<Vec<LocationLink>>> {
3739        let position = position.to_point_utf16(buffer.read(cx));
3740        self.request_lsp(buffer.clone(), GetDefinition { position }, cx)
3741    }
3742
3743    pub fn type_definition<T: ToPointUtf16>(
3744        &self,
3745        buffer: &ModelHandle<Buffer>,
3746        position: T,
3747        cx: &mut ModelContext<Self>,
3748    ) -> Task<Result<Vec<LocationLink>>> {
3749        let position = position.to_point_utf16(buffer.read(cx));
3750        self.request_lsp(buffer.clone(), GetTypeDefinition { position }, cx)
3751    }
3752
3753    pub fn references<T: ToPointUtf16>(
3754        &self,
3755        buffer: &ModelHandle<Buffer>,
3756        position: T,
3757        cx: &mut ModelContext<Self>,
3758    ) -> Task<Result<Vec<Location>>> {
3759        let position = position.to_point_utf16(buffer.read(cx));
3760        self.request_lsp(buffer.clone(), GetReferences { position }, cx)
3761    }
3762
3763    pub fn document_highlights<T: ToPointUtf16>(
3764        &self,
3765        buffer: &ModelHandle<Buffer>,
3766        position: T,
3767        cx: &mut ModelContext<Self>,
3768    ) -> Task<Result<Vec<DocumentHighlight>>> {
3769        let position = position.to_point_utf16(buffer.read(cx));
3770        self.request_lsp(buffer.clone(), GetDocumentHighlights { position }, cx)
3771    }
3772
3773    pub fn symbols(&self, query: &str, cx: &mut ModelContext<Self>) -> Task<Result<Vec<Symbol>>> {
3774        if self.is_local() {
3775            let mut requests = Vec::new();
3776            for ((worktree_id, _), server_id) in self.language_server_ids.iter() {
3777                let worktree_id = *worktree_id;
3778                if let Some(worktree) = self
3779                    .worktree_for_id(worktree_id, cx)
3780                    .and_then(|worktree| worktree.read(cx).as_local())
3781                {
3782                    if let Some(LanguageServerState::Running {
3783                        adapter,
3784                        language,
3785                        server,
3786                        ..
3787                    }) = self.language_servers.get(server_id)
3788                    {
3789                        let adapter = adapter.clone();
3790                        let language = language.clone();
3791                        let worktree_abs_path = worktree.abs_path().clone();
3792                        requests.push(
3793                            server
3794                                .request::<lsp::request::WorkspaceSymbol>(
3795                                    lsp::WorkspaceSymbolParams {
3796                                        query: query.to_string(),
3797                                        ..Default::default()
3798                                    },
3799                                )
3800                                .log_err()
3801                                .map(move |response| {
3802                                    (
3803                                        adapter,
3804                                        language,
3805                                        worktree_id,
3806                                        worktree_abs_path,
3807                                        response.unwrap_or_default(),
3808                                    )
3809                                }),
3810                        );
3811                    }
3812                }
3813            }
3814
3815            cx.spawn_weak(|this, cx| async move {
3816                let responses = futures::future::join_all(requests).await;
3817                let this = if let Some(this) = this.upgrade(&cx) {
3818                    this
3819                } else {
3820                    return Ok(Default::default());
3821                };
3822                let symbols = this.read_with(&cx, |this, cx| {
3823                    let mut symbols = Vec::new();
3824                    for (
3825                        adapter,
3826                        adapter_language,
3827                        source_worktree_id,
3828                        worktree_abs_path,
3829                        response,
3830                    ) in responses
3831                    {
3832                        symbols.extend(response.into_iter().flatten().filter_map(|lsp_symbol| {
3833                            let abs_path = lsp_symbol.location.uri.to_file_path().ok()?;
3834                            let mut worktree_id = source_worktree_id;
3835                            let path;
3836                            if let Some((worktree, rel_path)) =
3837                                this.find_local_worktree(&abs_path, cx)
3838                            {
3839                                worktree_id = worktree.read(cx).id();
3840                                path = rel_path;
3841                            } else {
3842                                path = relativize_path(&worktree_abs_path, &abs_path);
3843                            }
3844
3845                            let project_path = ProjectPath {
3846                                worktree_id,
3847                                path: path.into(),
3848                            };
3849                            let signature = this.symbol_signature(&project_path);
3850                            let adapter_language = adapter_language.clone();
3851                            let language = this
3852                                .languages
3853                                .language_for_file(&project_path.path, None)
3854                                .unwrap_or_else(move |_| adapter_language);
3855                            let language_server_name = adapter.name.clone();
3856                            Some(async move {
3857                                let language = language.await;
3858                                let label = language
3859                                    .label_for_symbol(&lsp_symbol.name, lsp_symbol.kind)
3860                                    .await;
3861
3862                                Symbol {
3863                                    language_server_name,
3864                                    source_worktree_id,
3865                                    path: project_path,
3866                                    label: label.unwrap_or_else(|| {
3867                                        CodeLabel::plain(lsp_symbol.name.clone(), None)
3868                                    }),
3869                                    kind: lsp_symbol.kind,
3870                                    name: lsp_symbol.name,
3871                                    range: range_from_lsp(lsp_symbol.location.range),
3872                                    signature,
3873                                }
3874                            })
3875                        }));
3876                    }
3877                    symbols
3878                });
3879                Ok(futures::future::join_all(symbols).await)
3880            })
3881        } else if let Some(project_id) = self.remote_id() {
3882            let request = self.client.request(proto::GetProjectSymbols {
3883                project_id,
3884                query: query.to_string(),
3885            });
3886            cx.spawn_weak(|this, cx| async move {
3887                let response = request.await?;
3888                let mut symbols = Vec::new();
3889                if let Some(this) = this.upgrade(&cx) {
3890                    let new_symbols = this.read_with(&cx, |this, _| {
3891                        response
3892                            .symbols
3893                            .into_iter()
3894                            .map(|symbol| this.deserialize_symbol(symbol))
3895                            .collect::<Vec<_>>()
3896                    });
3897                    symbols = futures::future::join_all(new_symbols)
3898                        .await
3899                        .into_iter()
3900                        .filter_map(|symbol| symbol.log_err())
3901                        .collect::<Vec<_>>();
3902                }
3903                Ok(symbols)
3904            })
3905        } else {
3906            Task::ready(Ok(Default::default()))
3907        }
3908    }
3909
3910    pub fn open_buffer_for_symbol(
3911        &mut self,
3912        symbol: &Symbol,
3913        cx: &mut ModelContext<Self>,
3914    ) -> Task<Result<ModelHandle<Buffer>>> {
3915        if self.is_local() {
3916            let language_server_id = if let Some(id) = self.language_server_ids.get(&(
3917                symbol.source_worktree_id,
3918                symbol.language_server_name.clone(),
3919            )) {
3920                *id
3921            } else {
3922                return Task::ready(Err(anyhow!(
3923                    "language server for worktree and language not found"
3924                )));
3925            };
3926
3927            let worktree_abs_path = if let Some(worktree_abs_path) = self
3928                .worktree_for_id(symbol.path.worktree_id, cx)
3929                .and_then(|worktree| worktree.read(cx).as_local())
3930                .map(|local_worktree| local_worktree.abs_path())
3931            {
3932                worktree_abs_path
3933            } else {
3934                return Task::ready(Err(anyhow!("worktree not found for symbol")));
3935            };
3936            let symbol_abs_path = worktree_abs_path.join(&symbol.path.path);
3937            let symbol_uri = if let Ok(uri) = lsp::Url::from_file_path(symbol_abs_path) {
3938                uri
3939            } else {
3940                return Task::ready(Err(anyhow!("invalid symbol path")));
3941            };
3942
3943            self.open_local_buffer_via_lsp(
3944                symbol_uri,
3945                language_server_id,
3946                symbol.language_server_name.clone(),
3947                cx,
3948            )
3949        } else if let Some(project_id) = self.remote_id() {
3950            let request = self.client.request(proto::OpenBufferForSymbol {
3951                project_id,
3952                symbol: Some(serialize_symbol(symbol)),
3953            });
3954            cx.spawn(|this, mut cx| async move {
3955                let response = request.await?;
3956                this.update(&mut cx, |this, cx| {
3957                    this.wait_for_remote_buffer(response.buffer_id, cx)
3958                })
3959                .await
3960            })
3961        } else {
3962            Task::ready(Err(anyhow!("project does not have a remote id")))
3963        }
3964    }
3965
3966    pub fn hover<T: ToPointUtf16>(
3967        &self,
3968        buffer: &ModelHandle<Buffer>,
3969        position: T,
3970        cx: &mut ModelContext<Self>,
3971    ) -> Task<Result<Option<Hover>>> {
3972        let position = position.to_point_utf16(buffer.read(cx));
3973        self.request_lsp(buffer.clone(), GetHover { position }, cx)
3974    }
3975
3976    pub fn completions<T: ToPointUtf16>(
3977        &self,
3978        buffer: &ModelHandle<Buffer>,
3979        position: T,
3980        cx: &mut ModelContext<Self>,
3981    ) -> Task<Result<Vec<Completion>>> {
3982        let position = position.to_point_utf16(buffer.read(cx));
3983        self.request_lsp(buffer.clone(), GetCompletions { position }, cx)
3984    }
3985
3986    pub fn apply_additional_edits_for_completion(
3987        &self,
3988        buffer_handle: ModelHandle<Buffer>,
3989        completion: Completion,
3990        push_to_history: bool,
3991        cx: &mut ModelContext<Self>,
3992    ) -> Task<Result<Option<Transaction>>> {
3993        let buffer = buffer_handle.read(cx);
3994        let buffer_id = buffer.remote_id();
3995
3996        if self.is_local() {
3997            let lang_server = match self.primary_language_servers_for_buffer(buffer, cx) {
3998                Some((_, server)) => server.clone(),
3999                _ => return Task::ready(Ok(Default::default())),
4000            };
4001
4002            cx.spawn(|this, mut cx| async move {
4003                let resolved_completion = lang_server
4004                    .request::<lsp::request::ResolveCompletionItem>(completion.lsp_completion)
4005                    .await?;
4006
4007                if let Some(edits) = resolved_completion.additional_text_edits {
4008                    let edits = this
4009                        .update(&mut cx, |this, cx| {
4010                            this.edits_from_lsp(
4011                                &buffer_handle,
4012                                edits,
4013                                lang_server.server_id(),
4014                                None,
4015                                cx,
4016                            )
4017                        })
4018                        .await?;
4019
4020                    buffer_handle.update(&mut cx, |buffer, cx| {
4021                        buffer.finalize_last_transaction();
4022                        buffer.start_transaction();
4023
4024                        for (range, text) in edits {
4025                            let primary = &completion.old_range;
4026                            let start_within = primary.start.cmp(&range.start, buffer).is_le()
4027                                && primary.end.cmp(&range.start, buffer).is_ge();
4028                            let end_within = range.start.cmp(&primary.end, buffer).is_le()
4029                                && range.end.cmp(&primary.end, buffer).is_ge();
4030
4031                            //Skip addtional edits which overlap with the primary completion edit
4032                            //https://github.com/zed-industries/zed/pull/1871
4033                            if !start_within && !end_within {
4034                                buffer.edit([(range, text)], None, cx);
4035                            }
4036                        }
4037
4038                        let transaction = if buffer.end_transaction(cx).is_some() {
4039                            let transaction = buffer.finalize_last_transaction().unwrap().clone();
4040                            if !push_to_history {
4041                                buffer.forget_transaction(transaction.id);
4042                            }
4043                            Some(transaction)
4044                        } else {
4045                            None
4046                        };
4047                        Ok(transaction)
4048                    })
4049                } else {
4050                    Ok(None)
4051                }
4052            })
4053        } else if let Some(project_id) = self.remote_id() {
4054            let client = self.client.clone();
4055            cx.spawn(|_, mut cx| async move {
4056                let response = client
4057                    .request(proto::ApplyCompletionAdditionalEdits {
4058                        project_id,
4059                        buffer_id,
4060                        completion: Some(language::proto::serialize_completion(&completion)),
4061                    })
4062                    .await?;
4063
4064                if let Some(transaction) = response.transaction {
4065                    let transaction = language::proto::deserialize_transaction(transaction)?;
4066                    buffer_handle
4067                        .update(&mut cx, |buffer, _| {
4068                            buffer.wait_for_edits(transaction.edit_ids.iter().copied())
4069                        })
4070                        .await?;
4071                    if push_to_history {
4072                        buffer_handle.update(&mut cx, |buffer, _| {
4073                            buffer.push_transaction(transaction.clone(), Instant::now());
4074                        });
4075                    }
4076                    Ok(Some(transaction))
4077                } else {
4078                    Ok(None)
4079                }
4080            })
4081        } else {
4082            Task::ready(Err(anyhow!("project does not have a remote id")))
4083        }
4084    }
4085
4086    pub fn code_actions<T: Clone + ToOffset>(
4087        &self,
4088        buffer_handle: &ModelHandle<Buffer>,
4089        range: Range<T>,
4090        cx: &mut ModelContext<Self>,
4091    ) -> Task<Result<Vec<CodeAction>>> {
4092        let buffer = buffer_handle.read(cx);
4093        let range = buffer.anchor_before(range.start)..buffer.anchor_before(range.end);
4094        self.request_lsp(buffer_handle.clone(), GetCodeActions { range }, cx)
4095    }
4096
4097    pub fn apply_code_action(
4098        &self,
4099        buffer_handle: ModelHandle<Buffer>,
4100        mut action: CodeAction,
4101        push_to_history: bool,
4102        cx: &mut ModelContext<Self>,
4103    ) -> Task<Result<ProjectTransaction>> {
4104        if self.is_local() {
4105            let buffer = buffer_handle.read(cx);
4106            let (lsp_adapter, lang_server) = if let Some((adapter, server)) =
4107                self.language_server_for_buffer(buffer, action.server_id, cx)
4108            {
4109                (adapter.clone(), server.clone())
4110            } else {
4111                return Task::ready(Ok(Default::default()));
4112            };
4113            let range = action.range.to_point_utf16(buffer);
4114
4115            cx.spawn(|this, mut cx| async move {
4116                if let Some(lsp_range) = action
4117                    .lsp_action
4118                    .data
4119                    .as_mut()
4120                    .and_then(|d| d.get_mut("codeActionParams"))
4121                    .and_then(|d| d.get_mut("range"))
4122                {
4123                    *lsp_range = serde_json::to_value(&range_to_lsp(range)).unwrap();
4124                    action.lsp_action = lang_server
4125                        .request::<lsp::request::CodeActionResolveRequest>(action.lsp_action)
4126                        .await?;
4127                } else {
4128                    let actions = this
4129                        .update(&mut cx, |this, cx| {
4130                            this.code_actions(&buffer_handle, action.range, cx)
4131                        })
4132                        .await?;
4133                    action.lsp_action = actions
4134                        .into_iter()
4135                        .find(|a| a.lsp_action.title == action.lsp_action.title)
4136                        .ok_or_else(|| anyhow!("code action is outdated"))?
4137                        .lsp_action;
4138                }
4139
4140                if let Some(edit) = action.lsp_action.edit {
4141                    if edit.changes.is_some() || edit.document_changes.is_some() {
4142                        return Self::deserialize_workspace_edit(
4143                            this,
4144                            edit,
4145                            push_to_history,
4146                            lsp_adapter.clone(),
4147                            lang_server.clone(),
4148                            &mut cx,
4149                        )
4150                        .await;
4151                    }
4152                }
4153
4154                if let Some(command) = action.lsp_action.command {
4155                    this.update(&mut cx, |this, _| {
4156                        this.last_workspace_edits_by_language_server
4157                            .remove(&lang_server.server_id());
4158                    });
4159                    lang_server
4160                        .request::<lsp::request::ExecuteCommand>(lsp::ExecuteCommandParams {
4161                            command: command.command,
4162                            arguments: command.arguments.unwrap_or_default(),
4163                            ..Default::default()
4164                        })
4165                        .await?;
4166                    return Ok(this.update(&mut cx, |this, _| {
4167                        this.last_workspace_edits_by_language_server
4168                            .remove(&lang_server.server_id())
4169                            .unwrap_or_default()
4170                    }));
4171                }
4172
4173                Ok(ProjectTransaction::default())
4174            })
4175        } else if let Some(project_id) = self.remote_id() {
4176            let client = self.client.clone();
4177            let request = proto::ApplyCodeAction {
4178                project_id,
4179                buffer_id: buffer_handle.read(cx).remote_id(),
4180                action: Some(language::proto::serialize_code_action(&action)),
4181            };
4182            cx.spawn(|this, mut cx| async move {
4183                let response = client
4184                    .request(request)
4185                    .await?
4186                    .transaction
4187                    .ok_or_else(|| anyhow!("missing transaction"))?;
4188                this.update(&mut cx, |this, cx| {
4189                    this.deserialize_project_transaction(response, push_to_history, cx)
4190                })
4191                .await
4192            })
4193        } else {
4194            Task::ready(Err(anyhow!("project does not have a remote id")))
4195        }
4196    }
4197
4198    fn apply_on_type_formatting(
4199        &self,
4200        buffer: ModelHandle<Buffer>,
4201        position: Anchor,
4202        trigger: String,
4203        cx: &mut ModelContext<Self>,
4204    ) -> Task<Result<Option<Transaction>>> {
4205        if self.is_local() {
4206            cx.spawn(|this, mut cx| async move {
4207                // Do not allow multiple concurrent formatting requests for the
4208                // same buffer.
4209                this.update(&mut cx, |this, cx| {
4210                    this.buffers_being_formatted
4211                        .insert(buffer.read(cx).remote_id())
4212                });
4213
4214                let _cleanup = defer({
4215                    let this = this.clone();
4216                    let mut cx = cx.clone();
4217                    let closure_buffer = buffer.clone();
4218                    move || {
4219                        this.update(&mut cx, |this, cx| {
4220                            this.buffers_being_formatted
4221                                .remove(&closure_buffer.read(cx).remote_id());
4222                        });
4223                    }
4224                });
4225
4226                buffer
4227                    .update(&mut cx, |buffer, _| {
4228                        buffer.wait_for_edits(Some(position.timestamp))
4229                    })
4230                    .await?;
4231                this.update(&mut cx, |this, cx| {
4232                    let position = position.to_point_utf16(buffer.read(cx));
4233                    this.on_type_format(buffer, position, trigger, false, cx)
4234                })
4235                .await
4236            })
4237        } else if let Some(project_id) = self.remote_id() {
4238            let client = self.client.clone();
4239            let request = proto::OnTypeFormatting {
4240                project_id,
4241                buffer_id: buffer.read(cx).remote_id(),
4242                position: Some(serialize_anchor(&position)),
4243                trigger,
4244                version: serialize_version(&buffer.read(cx).version()),
4245            };
4246            cx.spawn(|_, _| async move {
4247                client
4248                    .request(request)
4249                    .await?
4250                    .transaction
4251                    .map(language::proto::deserialize_transaction)
4252                    .transpose()
4253            })
4254        } else {
4255            Task::ready(Err(anyhow!("project does not have a remote id")))
4256        }
4257    }
4258
4259    async fn deserialize_edits(
4260        this: ModelHandle<Self>,
4261        buffer_to_edit: ModelHandle<Buffer>,
4262        edits: Vec<lsp::TextEdit>,
4263        push_to_history: bool,
4264        _: Arc<CachedLspAdapter>,
4265        language_server: Arc<LanguageServer>,
4266        cx: &mut AsyncAppContext,
4267    ) -> Result<Option<Transaction>> {
4268        let edits = this
4269            .update(cx, |this, cx| {
4270                this.edits_from_lsp(
4271                    &buffer_to_edit,
4272                    edits,
4273                    language_server.server_id(),
4274                    None,
4275                    cx,
4276                )
4277            })
4278            .await?;
4279
4280        let transaction = buffer_to_edit.update(cx, |buffer, cx| {
4281            buffer.finalize_last_transaction();
4282            buffer.start_transaction();
4283            for (range, text) in edits {
4284                buffer.edit([(range, text)], None, cx);
4285            }
4286
4287            if buffer.end_transaction(cx).is_some() {
4288                let transaction = buffer.finalize_last_transaction().unwrap().clone();
4289                if !push_to_history {
4290                    buffer.forget_transaction(transaction.id);
4291                }
4292                Some(transaction)
4293            } else {
4294                None
4295            }
4296        });
4297
4298        Ok(transaction)
4299    }
4300
4301    async fn deserialize_workspace_edit(
4302        this: ModelHandle<Self>,
4303        edit: lsp::WorkspaceEdit,
4304        push_to_history: bool,
4305        lsp_adapter: Arc<CachedLspAdapter>,
4306        language_server: Arc<LanguageServer>,
4307        cx: &mut AsyncAppContext,
4308    ) -> Result<ProjectTransaction> {
4309        let fs = this.read_with(cx, |this, _| this.fs.clone());
4310        let mut operations = Vec::new();
4311        if let Some(document_changes) = edit.document_changes {
4312            match document_changes {
4313                lsp::DocumentChanges::Edits(edits) => {
4314                    operations.extend(edits.into_iter().map(lsp::DocumentChangeOperation::Edit))
4315                }
4316                lsp::DocumentChanges::Operations(ops) => operations = ops,
4317            }
4318        } else if let Some(changes) = edit.changes {
4319            operations.extend(changes.into_iter().map(|(uri, edits)| {
4320                lsp::DocumentChangeOperation::Edit(lsp::TextDocumentEdit {
4321                    text_document: lsp::OptionalVersionedTextDocumentIdentifier {
4322                        uri,
4323                        version: None,
4324                    },
4325                    edits: edits.into_iter().map(lsp::OneOf::Left).collect(),
4326                })
4327            }));
4328        }
4329
4330        let mut project_transaction = ProjectTransaction::default();
4331        for operation in operations {
4332            match operation {
4333                lsp::DocumentChangeOperation::Op(lsp::ResourceOp::Create(op)) => {
4334                    let abs_path = op
4335                        .uri
4336                        .to_file_path()
4337                        .map_err(|_| anyhow!("can't convert URI to path"))?;
4338
4339                    if let Some(parent_path) = abs_path.parent() {
4340                        fs.create_dir(parent_path).await?;
4341                    }
4342                    if abs_path.ends_with("/") {
4343                        fs.create_dir(&abs_path).await?;
4344                    } else {
4345                        fs.create_file(&abs_path, op.options.map(Into::into).unwrap_or_default())
4346                            .await?;
4347                    }
4348                }
4349
4350                lsp::DocumentChangeOperation::Op(lsp::ResourceOp::Rename(op)) => {
4351                    let source_abs_path = op
4352                        .old_uri
4353                        .to_file_path()
4354                        .map_err(|_| anyhow!("can't convert URI to path"))?;
4355                    let target_abs_path = op
4356                        .new_uri
4357                        .to_file_path()
4358                        .map_err(|_| anyhow!("can't convert URI to path"))?;
4359                    fs.rename(
4360                        &source_abs_path,
4361                        &target_abs_path,
4362                        op.options.map(Into::into).unwrap_or_default(),
4363                    )
4364                    .await?;
4365                }
4366
4367                lsp::DocumentChangeOperation::Op(lsp::ResourceOp::Delete(op)) => {
4368                    let abs_path = op
4369                        .uri
4370                        .to_file_path()
4371                        .map_err(|_| anyhow!("can't convert URI to path"))?;
4372                    let options = op.options.map(Into::into).unwrap_or_default();
4373                    if abs_path.ends_with("/") {
4374                        fs.remove_dir(&abs_path, options).await?;
4375                    } else {
4376                        fs.remove_file(&abs_path, options).await?;
4377                    }
4378                }
4379
4380                lsp::DocumentChangeOperation::Edit(op) => {
4381                    let buffer_to_edit = this
4382                        .update(cx, |this, cx| {
4383                            this.open_local_buffer_via_lsp(
4384                                op.text_document.uri,
4385                                language_server.server_id(),
4386                                lsp_adapter.name.clone(),
4387                                cx,
4388                            )
4389                        })
4390                        .await?;
4391
4392                    let edits = this
4393                        .update(cx, |this, cx| {
4394                            let edits = op.edits.into_iter().map(|edit| match edit {
4395                                lsp::OneOf::Left(edit) => edit,
4396                                lsp::OneOf::Right(edit) => edit.text_edit,
4397                            });
4398                            this.edits_from_lsp(
4399                                &buffer_to_edit,
4400                                edits,
4401                                language_server.server_id(),
4402                                op.text_document.version,
4403                                cx,
4404                            )
4405                        })
4406                        .await?;
4407
4408                    let transaction = buffer_to_edit.update(cx, |buffer, cx| {
4409                        buffer.finalize_last_transaction();
4410                        buffer.start_transaction();
4411                        for (range, text) in edits {
4412                            buffer.edit([(range, text)], None, cx);
4413                        }
4414                        let transaction = if buffer.end_transaction(cx).is_some() {
4415                            let transaction = buffer.finalize_last_transaction().unwrap().clone();
4416                            if !push_to_history {
4417                                buffer.forget_transaction(transaction.id);
4418                            }
4419                            Some(transaction)
4420                        } else {
4421                            None
4422                        };
4423
4424                        transaction
4425                    });
4426                    if let Some(transaction) = transaction {
4427                        project_transaction.0.insert(buffer_to_edit, transaction);
4428                    }
4429                }
4430            }
4431        }
4432
4433        Ok(project_transaction)
4434    }
4435
4436    pub fn prepare_rename<T: ToPointUtf16>(
4437        &self,
4438        buffer: ModelHandle<Buffer>,
4439        position: T,
4440        cx: &mut ModelContext<Self>,
4441    ) -> Task<Result<Option<Range<Anchor>>>> {
4442        let position = position.to_point_utf16(buffer.read(cx));
4443        self.request_lsp(buffer, PrepareRename { position }, cx)
4444    }
4445
4446    pub fn perform_rename<T: ToPointUtf16>(
4447        &self,
4448        buffer: ModelHandle<Buffer>,
4449        position: T,
4450        new_name: String,
4451        push_to_history: bool,
4452        cx: &mut ModelContext<Self>,
4453    ) -> Task<Result<ProjectTransaction>> {
4454        let position = position.to_point_utf16(buffer.read(cx));
4455        self.request_lsp(
4456            buffer,
4457            PerformRename {
4458                position,
4459                new_name,
4460                push_to_history,
4461            },
4462            cx,
4463        )
4464    }
4465
4466    pub fn on_type_format<T: ToPointUtf16>(
4467        &self,
4468        buffer: ModelHandle<Buffer>,
4469        position: T,
4470        trigger: String,
4471        push_to_history: bool,
4472        cx: &mut ModelContext<Self>,
4473    ) -> Task<Result<Option<Transaction>>> {
4474        let (position, tab_size) = buffer.read_with(cx, |buffer, cx| {
4475            let position = position.to_point_utf16(buffer);
4476            (
4477                position,
4478                language_settings(buffer.language_at(position).as_ref(), buffer.file(), cx)
4479                    .tab_size,
4480            )
4481        });
4482        self.request_lsp(
4483            buffer.clone(),
4484            OnTypeFormatting {
4485                position,
4486                trigger,
4487                options: lsp_command::lsp_formatting_options(tab_size.get()).into(),
4488                push_to_history,
4489            },
4490            cx,
4491        )
4492    }
4493
4494    #[allow(clippy::type_complexity)]
4495    pub fn search(
4496        &self,
4497        query: SearchQuery,
4498        cx: &mut ModelContext<Self>,
4499    ) -> Task<Result<HashMap<ModelHandle<Buffer>, Vec<Range<Anchor>>>>> {
4500        if self.is_local() {
4501            let snapshots = self
4502                .visible_worktrees(cx)
4503                .filter_map(|tree| {
4504                    let tree = tree.read(cx).as_local()?;
4505                    Some(tree.snapshot())
4506                })
4507                .collect::<Vec<_>>();
4508
4509            let background = cx.background().clone();
4510            let path_count: usize = snapshots.iter().map(|s| s.visible_file_count()).sum();
4511            if path_count == 0 {
4512                return Task::ready(Ok(Default::default()));
4513            }
4514            let workers = background.num_cpus().min(path_count);
4515            let (matching_paths_tx, mut matching_paths_rx) = smol::channel::bounded(1024);
4516            cx.background()
4517                .spawn({
4518                    let fs = self.fs.clone();
4519                    let background = cx.background().clone();
4520                    let query = query.clone();
4521                    async move {
4522                        let fs = &fs;
4523                        let query = &query;
4524                        let matching_paths_tx = &matching_paths_tx;
4525                        let paths_per_worker = (path_count + workers - 1) / workers;
4526                        let snapshots = &snapshots;
4527                        background
4528                            .scoped(|scope| {
4529                                for worker_ix in 0..workers {
4530                                    let worker_start_ix = worker_ix * paths_per_worker;
4531                                    let worker_end_ix = worker_start_ix + paths_per_worker;
4532                                    scope.spawn(async move {
4533                                        let mut snapshot_start_ix = 0;
4534                                        let mut abs_path = PathBuf::new();
4535                                        for snapshot in snapshots {
4536                                            let snapshot_end_ix =
4537                                                snapshot_start_ix + snapshot.visible_file_count();
4538                                            if worker_end_ix <= snapshot_start_ix {
4539                                                break;
4540                                            } else if worker_start_ix > snapshot_end_ix {
4541                                                snapshot_start_ix = snapshot_end_ix;
4542                                                continue;
4543                                            } else {
4544                                                let start_in_snapshot = worker_start_ix
4545                                                    .saturating_sub(snapshot_start_ix);
4546                                                let end_in_snapshot =
4547                                                    cmp::min(worker_end_ix, snapshot_end_ix)
4548                                                        - snapshot_start_ix;
4549
4550                                                for entry in snapshot
4551                                                    .files(false, start_in_snapshot)
4552                                                    .take(end_in_snapshot - start_in_snapshot)
4553                                                {
4554                                                    if matching_paths_tx.is_closed() {
4555                                                        break;
4556                                                    }
4557                                                    let matches = if query
4558                                                        .file_matches(Some(&entry.path))
4559                                                    {
4560                                                        abs_path.clear();
4561                                                        abs_path.push(&snapshot.abs_path());
4562                                                        abs_path.push(&entry.path);
4563                                                        if let Some(file) =
4564                                                            fs.open_sync(&abs_path).await.log_err()
4565                                                        {
4566                                                            query.detect(file).unwrap_or(false)
4567                                                        } else {
4568                                                            false
4569                                                        }
4570                                                    } else {
4571                                                        false
4572                                                    };
4573
4574                                                    if matches {
4575                                                        let project_path =
4576                                                            (snapshot.id(), entry.path.clone());
4577                                                        if matching_paths_tx
4578                                                            .send(project_path)
4579                                                            .await
4580                                                            .is_err()
4581                                                        {
4582                                                            break;
4583                                                        }
4584                                                    }
4585                                                }
4586
4587                                                snapshot_start_ix = snapshot_end_ix;
4588                                            }
4589                                        }
4590                                    });
4591                                }
4592                            })
4593                            .await;
4594                    }
4595                })
4596                .detach();
4597
4598            let (buffers_tx, buffers_rx) = smol::channel::bounded(1024);
4599            let open_buffers = self
4600                .opened_buffers
4601                .values()
4602                .filter_map(|b| b.upgrade(cx))
4603                .collect::<HashSet<_>>();
4604            cx.spawn(|this, cx| async move {
4605                for buffer in &open_buffers {
4606                    let snapshot = buffer.read_with(&cx, |buffer, _| buffer.snapshot());
4607                    buffers_tx.send((buffer.clone(), snapshot)).await?;
4608                }
4609
4610                let open_buffers = Rc::new(RefCell::new(open_buffers));
4611                while let Some(project_path) = matching_paths_rx.next().await {
4612                    if buffers_tx.is_closed() {
4613                        break;
4614                    }
4615
4616                    let this = this.clone();
4617                    let open_buffers = open_buffers.clone();
4618                    let buffers_tx = buffers_tx.clone();
4619                    cx.spawn(|mut cx| async move {
4620                        if let Some(buffer) = this
4621                            .update(&mut cx, |this, cx| this.open_buffer(project_path, cx))
4622                            .await
4623                            .log_err()
4624                        {
4625                            if open_buffers.borrow_mut().insert(buffer.clone()) {
4626                                let snapshot = buffer.read_with(&cx, |buffer, _| buffer.snapshot());
4627                                buffers_tx.send((buffer, snapshot)).await?;
4628                            }
4629                        }
4630
4631                        Ok::<_, anyhow::Error>(())
4632                    })
4633                    .detach();
4634                }
4635
4636                Ok::<_, anyhow::Error>(())
4637            })
4638            .detach_and_log_err(cx);
4639
4640            let background = cx.background().clone();
4641            cx.background().spawn(async move {
4642                let query = &query;
4643                let mut matched_buffers = Vec::new();
4644                for _ in 0..workers {
4645                    matched_buffers.push(HashMap::default());
4646                }
4647                background
4648                    .scoped(|scope| {
4649                        for worker_matched_buffers in matched_buffers.iter_mut() {
4650                            let mut buffers_rx = buffers_rx.clone();
4651                            scope.spawn(async move {
4652                                while let Some((buffer, snapshot)) = buffers_rx.next().await {
4653                                    let buffer_matches = if query.file_matches(
4654                                        snapshot.file().map(|file| file.path().as_ref()),
4655                                    ) {
4656                                        query
4657                                            .search(snapshot.as_rope())
4658                                            .await
4659                                            .iter()
4660                                            .map(|range| {
4661                                                snapshot.anchor_before(range.start)
4662                                                    ..snapshot.anchor_after(range.end)
4663                                            })
4664                                            .collect()
4665                                    } else {
4666                                        Vec::new()
4667                                    };
4668                                    if !buffer_matches.is_empty() {
4669                                        worker_matched_buffers
4670                                            .insert(buffer.clone(), buffer_matches);
4671                                    }
4672                                }
4673                            });
4674                        }
4675                    })
4676                    .await;
4677                Ok(matched_buffers.into_iter().flatten().collect())
4678            })
4679        } else if let Some(project_id) = self.remote_id() {
4680            let request = self.client.request(query.to_proto(project_id));
4681            cx.spawn(|this, mut cx| async move {
4682                let response = request.await?;
4683                let mut result = HashMap::default();
4684                for location in response.locations {
4685                    let target_buffer = this
4686                        .update(&mut cx, |this, cx| {
4687                            this.wait_for_remote_buffer(location.buffer_id, cx)
4688                        })
4689                        .await?;
4690                    let start = location
4691                        .start
4692                        .and_then(deserialize_anchor)
4693                        .ok_or_else(|| anyhow!("missing target start"))?;
4694                    let end = location
4695                        .end
4696                        .and_then(deserialize_anchor)
4697                        .ok_or_else(|| anyhow!("missing target end"))?;
4698                    result
4699                        .entry(target_buffer)
4700                        .or_insert(Vec::new())
4701                        .push(start..end)
4702                }
4703                Ok(result)
4704            })
4705        } else {
4706            Task::ready(Ok(Default::default()))
4707        }
4708    }
4709
4710    // TODO: Wire this up to allow selecting a server?
4711    fn request_lsp<R: LspCommand>(
4712        &self,
4713        buffer_handle: ModelHandle<Buffer>,
4714        request: R,
4715        cx: &mut ModelContext<Self>,
4716    ) -> Task<Result<R::Response>>
4717    where
4718        <R::LspRequest as lsp::request::Request>::Result: Send,
4719    {
4720        let buffer = buffer_handle.read(cx);
4721        if self.is_local() {
4722            let file = File::from_dyn(buffer.file()).and_then(File::as_local);
4723            if let Some((file, language_server)) = file.zip(
4724                self.primary_language_servers_for_buffer(buffer, cx)
4725                    .map(|(_, server)| server.clone()),
4726            ) {
4727                let lsp_params = request.to_lsp(&file.abs_path(cx), buffer, &language_server, cx);
4728                return cx.spawn(|this, cx| async move {
4729                    if !request.check_capabilities(language_server.capabilities()) {
4730                        return Ok(Default::default());
4731                    }
4732
4733                    let response = language_server
4734                        .request::<R::LspRequest>(lsp_params)
4735                        .await
4736                        .context("lsp request failed")?;
4737                    request
4738                        .response_from_lsp(
4739                            response,
4740                            this,
4741                            buffer_handle,
4742                            language_server.server_id(),
4743                            cx,
4744                        )
4745                        .await
4746                });
4747            }
4748        } else if let Some(project_id) = self.remote_id() {
4749            let rpc = self.client.clone();
4750            let message = request.to_proto(project_id, buffer);
4751            return cx.spawn_weak(|this, cx| async move {
4752                // Ensure the project is still alive by the time the task
4753                // is scheduled.
4754                this.upgrade(&cx)
4755                    .ok_or_else(|| anyhow!("project dropped"))?;
4756
4757                let response = rpc.request(message).await?;
4758
4759                let this = this
4760                    .upgrade(&cx)
4761                    .ok_or_else(|| anyhow!("project dropped"))?;
4762                if this.read_with(&cx, |this, _| this.is_read_only()) {
4763                    Err(anyhow!("disconnected before completing request"))
4764                } else {
4765                    request
4766                        .response_from_proto(response, this, buffer_handle, cx)
4767                        .await
4768                }
4769            });
4770        }
4771        Task::ready(Ok(Default::default()))
4772    }
4773
4774    pub fn find_or_create_local_worktree(
4775        &mut self,
4776        abs_path: impl AsRef<Path>,
4777        visible: bool,
4778        cx: &mut ModelContext<Self>,
4779    ) -> Task<Result<(ModelHandle<Worktree>, PathBuf)>> {
4780        let abs_path = abs_path.as_ref();
4781        if let Some((tree, relative_path)) = self.find_local_worktree(abs_path, cx) {
4782            Task::ready(Ok((tree, relative_path)))
4783        } else {
4784            let worktree = self.create_local_worktree(abs_path, visible, cx);
4785            cx.foreground()
4786                .spawn(async move { Ok((worktree.await?, PathBuf::new())) })
4787        }
4788    }
4789
4790    pub fn find_local_worktree(
4791        &self,
4792        abs_path: &Path,
4793        cx: &AppContext,
4794    ) -> Option<(ModelHandle<Worktree>, PathBuf)> {
4795        for tree in &self.worktrees {
4796            if let Some(tree) = tree.upgrade(cx) {
4797                if let Some(relative_path) = tree
4798                    .read(cx)
4799                    .as_local()
4800                    .and_then(|t| abs_path.strip_prefix(t.abs_path()).ok())
4801                {
4802                    return Some((tree.clone(), relative_path.into()));
4803                }
4804            }
4805        }
4806        None
4807    }
4808
4809    pub fn is_shared(&self) -> bool {
4810        match &self.client_state {
4811            Some(ProjectClientState::Local { .. }) => true,
4812            _ => false,
4813        }
4814    }
4815
4816    fn create_local_worktree(
4817        &mut self,
4818        abs_path: impl AsRef<Path>,
4819        visible: bool,
4820        cx: &mut ModelContext<Self>,
4821    ) -> Task<Result<ModelHandle<Worktree>>> {
4822        let fs = self.fs.clone();
4823        let client = self.client.clone();
4824        let next_entry_id = self.next_entry_id.clone();
4825        let path: Arc<Path> = abs_path.as_ref().into();
4826        let task = self
4827            .loading_local_worktrees
4828            .entry(path.clone())
4829            .or_insert_with(|| {
4830                cx.spawn(|project, mut cx| {
4831                    async move {
4832                        let worktree = Worktree::local(
4833                            client.clone(),
4834                            path.clone(),
4835                            visible,
4836                            fs,
4837                            next_entry_id,
4838                            &mut cx,
4839                        )
4840                        .await;
4841
4842                        project.update(&mut cx, |project, _| {
4843                            project.loading_local_worktrees.remove(&path);
4844                        });
4845
4846                        let worktree = worktree?;
4847                        project.update(&mut cx, |project, cx| project.add_worktree(&worktree, cx));
4848                        Ok(worktree)
4849                    }
4850                    .map_err(Arc::new)
4851                })
4852                .shared()
4853            })
4854            .clone();
4855        cx.foreground().spawn(async move {
4856            match task.await {
4857                Ok(worktree) => Ok(worktree),
4858                Err(err) => Err(anyhow!("{}", err)),
4859            }
4860        })
4861    }
4862
4863    pub fn remove_worktree(&mut self, id_to_remove: WorktreeId, cx: &mut ModelContext<Self>) {
4864        self.worktrees.retain(|worktree| {
4865            if let Some(worktree) = worktree.upgrade(cx) {
4866                let id = worktree.read(cx).id();
4867                if id == id_to_remove {
4868                    cx.emit(Event::WorktreeRemoved(id));
4869                    false
4870                } else {
4871                    true
4872                }
4873            } else {
4874                false
4875            }
4876        });
4877        self.metadata_changed(cx);
4878    }
4879
4880    fn add_worktree(&mut self, worktree: &ModelHandle<Worktree>, cx: &mut ModelContext<Self>) {
4881        cx.observe(worktree, |_, _, cx| cx.notify()).detach();
4882        if worktree.read(cx).is_local() {
4883            cx.subscribe(worktree, |this, worktree, event, cx| match event {
4884                worktree::Event::UpdatedEntries(changes) => {
4885                    this.update_local_worktree_buffers(&worktree, changes, cx);
4886                    this.update_local_worktree_language_servers(&worktree, changes, cx);
4887                    this.update_local_worktree_settings(&worktree, changes, cx);
4888                }
4889                worktree::Event::UpdatedGitRepositories(updated_repos) => {
4890                    this.update_local_worktree_buffers_git_repos(worktree, updated_repos, cx)
4891                }
4892            })
4893            .detach();
4894        }
4895
4896        let push_strong_handle = {
4897            let worktree = worktree.read(cx);
4898            self.is_shared() || worktree.is_visible() || worktree.is_remote()
4899        };
4900        if push_strong_handle {
4901            self.worktrees
4902                .push(WorktreeHandle::Strong(worktree.clone()));
4903        } else {
4904            self.worktrees
4905                .push(WorktreeHandle::Weak(worktree.downgrade()));
4906        }
4907
4908        let handle_id = worktree.id();
4909        cx.observe_release(worktree, move |this, worktree, cx| {
4910            let _ = this.remove_worktree(worktree.id(), cx);
4911            cx.update_global::<SettingsStore, _, _>(|store, cx| {
4912                store.clear_local_settings(handle_id, cx).log_err()
4913            });
4914        })
4915        .detach();
4916
4917        cx.emit(Event::WorktreeAdded);
4918        self.metadata_changed(cx);
4919    }
4920
4921    fn update_local_worktree_buffers(
4922        &mut self,
4923        worktree_handle: &ModelHandle<Worktree>,
4924        changes: &[(Arc<Path>, ProjectEntryId, PathChange)],
4925        cx: &mut ModelContext<Self>,
4926    ) {
4927        let snapshot = worktree_handle.read(cx).snapshot();
4928
4929        let mut renamed_buffers = Vec::new();
4930        for (path, entry_id, _) in changes {
4931            let worktree_id = worktree_handle.read(cx).id();
4932            let project_path = ProjectPath {
4933                worktree_id,
4934                path: path.clone(),
4935            };
4936
4937            let buffer_id = match self.local_buffer_ids_by_entry_id.get(entry_id) {
4938                Some(&buffer_id) => buffer_id,
4939                None => match self.local_buffer_ids_by_path.get(&project_path) {
4940                    Some(&buffer_id) => buffer_id,
4941                    None => continue,
4942                },
4943            };
4944
4945            let open_buffer = self.opened_buffers.get(&buffer_id);
4946            let buffer = if let Some(buffer) = open_buffer.and_then(|buffer| buffer.upgrade(cx)) {
4947                buffer
4948            } else {
4949                self.opened_buffers.remove(&buffer_id);
4950                self.local_buffer_ids_by_path.remove(&project_path);
4951                self.local_buffer_ids_by_entry_id.remove(entry_id);
4952                continue;
4953            };
4954
4955            buffer.update(cx, |buffer, cx| {
4956                if let Some(old_file) = File::from_dyn(buffer.file()) {
4957                    if old_file.worktree != *worktree_handle {
4958                        return;
4959                    }
4960
4961                    let new_file = if let Some(entry) = snapshot.entry_for_id(old_file.entry_id) {
4962                        File {
4963                            is_local: true,
4964                            entry_id: entry.id,
4965                            mtime: entry.mtime,
4966                            path: entry.path.clone(),
4967                            worktree: worktree_handle.clone(),
4968                            is_deleted: false,
4969                        }
4970                    } else if let Some(entry) = snapshot.entry_for_path(old_file.path().as_ref()) {
4971                        File {
4972                            is_local: true,
4973                            entry_id: entry.id,
4974                            mtime: entry.mtime,
4975                            path: entry.path.clone(),
4976                            worktree: worktree_handle.clone(),
4977                            is_deleted: false,
4978                        }
4979                    } else {
4980                        File {
4981                            is_local: true,
4982                            entry_id: old_file.entry_id,
4983                            path: old_file.path().clone(),
4984                            mtime: old_file.mtime(),
4985                            worktree: worktree_handle.clone(),
4986                            is_deleted: true,
4987                        }
4988                    };
4989
4990                    let old_path = old_file.abs_path(cx);
4991                    if new_file.abs_path(cx) != old_path {
4992                        renamed_buffers.push((cx.handle(), old_file.clone()));
4993                        self.local_buffer_ids_by_path.remove(&project_path);
4994                        self.local_buffer_ids_by_path.insert(
4995                            ProjectPath {
4996                                worktree_id,
4997                                path: path.clone(),
4998                            },
4999                            buffer_id,
5000                        );
5001                    }
5002
5003                    if new_file.entry_id != *entry_id {
5004                        self.local_buffer_ids_by_entry_id.remove(entry_id);
5005                        self.local_buffer_ids_by_entry_id
5006                            .insert(new_file.entry_id, buffer_id);
5007                    }
5008
5009                    if new_file != *old_file {
5010                        if let Some(project_id) = self.remote_id() {
5011                            self.client
5012                                .send(proto::UpdateBufferFile {
5013                                    project_id,
5014                                    buffer_id: buffer_id as u64,
5015                                    file: Some(new_file.to_proto()),
5016                                })
5017                                .log_err();
5018                        }
5019
5020                        buffer.file_updated(Arc::new(new_file), cx).detach();
5021                    }
5022                }
5023            });
5024        }
5025
5026        for (buffer, old_file) in renamed_buffers {
5027            self.unregister_buffer_from_language_servers(&buffer, &old_file, cx);
5028            self.detect_language_for_buffer(&buffer, cx);
5029            self.register_buffer_with_language_servers(&buffer, cx);
5030        }
5031    }
5032
5033    fn update_local_worktree_language_servers(
5034        &mut self,
5035        worktree_handle: &ModelHandle<Worktree>,
5036        changes: &[(Arc<Path>, ProjectEntryId, PathChange)],
5037        cx: &mut ModelContext<Self>,
5038    ) {
5039        if changes.is_empty() {
5040            return;
5041        }
5042
5043        let worktree_id = worktree_handle.read(cx).id();
5044        let mut language_server_ids = self
5045            .language_server_ids
5046            .iter()
5047            .filter_map(|((server_worktree_id, _), server_id)| {
5048                (*server_worktree_id == worktree_id).then_some(*server_id)
5049            })
5050            .collect::<Vec<_>>();
5051        language_server_ids.sort();
5052        language_server_ids.dedup();
5053
5054        let abs_path = worktree_handle.read(cx).abs_path();
5055        for server_id in &language_server_ids {
5056            if let Some(server) = self.language_servers.get(server_id) {
5057                if let LanguageServerState::Running {
5058                    server,
5059                    watched_paths,
5060                    ..
5061                } = server
5062                {
5063                    if let Some(watched_paths) = watched_paths.get(&worktree_id) {
5064                        let params = lsp::DidChangeWatchedFilesParams {
5065                            changes: changes
5066                                .iter()
5067                                .filter_map(|(path, _, change)| {
5068                                    if !watched_paths.is_match(&path) {
5069                                        return None;
5070                                    }
5071                                    let typ = match change {
5072                                        PathChange::Loaded => return None,
5073                                        PathChange::Added => lsp::FileChangeType::CREATED,
5074                                        PathChange::Removed => lsp::FileChangeType::DELETED,
5075                                        PathChange::Updated => lsp::FileChangeType::CHANGED,
5076                                        PathChange::AddedOrUpdated => lsp::FileChangeType::CHANGED,
5077                                    };
5078                                    Some(lsp::FileEvent {
5079                                        uri: lsp::Url::from_file_path(abs_path.join(path)).unwrap(),
5080                                        typ,
5081                                    })
5082                                })
5083                                .collect(),
5084                        };
5085
5086                        if !params.changes.is_empty() {
5087                            server
5088                                .notify::<lsp::notification::DidChangeWatchedFiles>(params)
5089                                .log_err();
5090                        }
5091                    }
5092                }
5093            }
5094        }
5095    }
5096
5097    fn update_local_worktree_buffers_git_repos(
5098        &mut self,
5099        worktree_handle: ModelHandle<Worktree>,
5100        changed_repos: &UpdatedGitRepositoriesSet,
5101        cx: &mut ModelContext<Self>,
5102    ) {
5103        debug_assert!(worktree_handle.read(cx).is_local());
5104
5105        // Identify the loading buffers whose containing repository that has changed.
5106        let future_buffers = self
5107            .loading_buffers_by_path
5108            .iter()
5109            .filter_map(|(project_path, receiver)| {
5110                if project_path.worktree_id != worktree_handle.read(cx).id() {
5111                    return None;
5112                }
5113                let path = &project_path.path;
5114                changed_repos.iter().find(|(work_dir, change)| {
5115                    path.starts_with(work_dir) && change.git_dir_changed
5116                })?;
5117                let receiver = receiver.clone();
5118                let path = path.clone();
5119                Some(async move {
5120                    wait_for_loading_buffer(receiver)
5121                        .await
5122                        .ok()
5123                        .map(|buffer| (buffer, path))
5124                })
5125            })
5126            .collect::<FuturesUnordered<_>>();
5127
5128        // Identify the current buffers whose containing repository has changed.
5129        let current_buffers = self
5130            .opened_buffers
5131            .values()
5132            .filter_map(|buffer| {
5133                let buffer = buffer.upgrade(cx)?;
5134                let file = File::from_dyn(buffer.read(cx).file())?;
5135                if file.worktree != worktree_handle {
5136                    return None;
5137                }
5138                let path = file.path();
5139                changed_repos.iter().find(|(work_dir, change)| {
5140                    path.starts_with(work_dir) && change.git_dir_changed
5141                })?;
5142                Some((buffer, path.clone()))
5143            })
5144            .collect::<Vec<_>>();
5145
5146        if future_buffers.len() + current_buffers.len() == 0 {
5147            return;
5148        }
5149
5150        let remote_id = self.remote_id();
5151        let client = self.client.clone();
5152        cx.spawn_weak(move |_, mut cx| async move {
5153            // Wait for all of the buffers to load.
5154            let future_buffers = future_buffers.collect::<Vec<_>>().await;
5155
5156            // Reload the diff base for every buffer whose containing git repository has changed.
5157            let snapshot =
5158                worktree_handle.read_with(&cx, |tree, _| tree.as_local().unwrap().snapshot());
5159            let diff_bases_by_buffer = cx
5160                .background()
5161                .spawn(async move {
5162                    future_buffers
5163                        .into_iter()
5164                        .filter_map(|e| e)
5165                        .chain(current_buffers)
5166                        .filter_map(|(buffer, path)| {
5167                            let (work_directory, repo) =
5168                                snapshot.repository_and_work_directory_for_path(&path)?;
5169                            let repo = snapshot.get_local_repo(&repo)?;
5170                            let relative_path = path.strip_prefix(&work_directory).ok()?;
5171                            let base_text = repo.repo_ptr.lock().load_index_text(&relative_path);
5172                            Some((buffer, base_text))
5173                        })
5174                        .collect::<Vec<_>>()
5175                })
5176                .await;
5177
5178            // Assign the new diff bases on all of the buffers.
5179            for (buffer, diff_base) in diff_bases_by_buffer {
5180                let buffer_id = buffer.update(&mut cx, |buffer, cx| {
5181                    buffer.set_diff_base(diff_base.clone(), cx);
5182                    buffer.remote_id()
5183                });
5184                if let Some(project_id) = remote_id {
5185                    client
5186                        .send(proto::UpdateDiffBase {
5187                            project_id,
5188                            buffer_id,
5189                            diff_base,
5190                        })
5191                        .log_err();
5192                }
5193            }
5194        })
5195        .detach();
5196    }
5197
5198    fn update_local_worktree_settings(
5199        &mut self,
5200        worktree: &ModelHandle<Worktree>,
5201        changes: &UpdatedEntriesSet,
5202        cx: &mut ModelContext<Self>,
5203    ) {
5204        let project_id = self.remote_id();
5205        let worktree_id = worktree.id();
5206        let worktree = worktree.read(cx).as_local().unwrap();
5207        let remote_worktree_id = worktree.id();
5208
5209        let mut settings_contents = Vec::new();
5210        for (path, _, change) in changes.iter() {
5211            if path.ends_with(&*LOCAL_SETTINGS_RELATIVE_PATH) {
5212                let settings_dir = Arc::from(
5213                    path.ancestors()
5214                        .nth(LOCAL_SETTINGS_RELATIVE_PATH.components().count())
5215                        .unwrap(),
5216                );
5217                let fs = self.fs.clone();
5218                let removed = *change == PathChange::Removed;
5219                let abs_path = worktree.absolutize(path);
5220                settings_contents.push(async move {
5221                    (settings_dir, (!removed).then_some(fs.load(&abs_path).await))
5222                });
5223            }
5224        }
5225
5226        if settings_contents.is_empty() {
5227            return;
5228        }
5229
5230        let client = self.client.clone();
5231        cx.spawn_weak(move |_, mut cx| async move {
5232            let settings_contents: Vec<(Arc<Path>, _)> =
5233                futures::future::join_all(settings_contents).await;
5234            cx.update(|cx| {
5235                cx.update_global::<SettingsStore, _, _>(|store, cx| {
5236                    for (directory, file_content) in settings_contents {
5237                        let file_content = file_content.and_then(|content| content.log_err());
5238                        store
5239                            .set_local_settings(
5240                                worktree_id,
5241                                directory.clone(),
5242                                file_content.as_ref().map(String::as_str),
5243                                cx,
5244                            )
5245                            .log_err();
5246                        if let Some(remote_id) = project_id {
5247                            client
5248                                .send(proto::UpdateWorktreeSettings {
5249                                    project_id: remote_id,
5250                                    worktree_id: remote_worktree_id.to_proto(),
5251                                    path: directory.to_string_lossy().into_owned(),
5252                                    content: file_content,
5253                                })
5254                                .log_err();
5255                        }
5256                    }
5257                });
5258            });
5259        })
5260        .detach();
5261    }
5262
5263    pub fn set_active_path(&mut self, entry: Option<ProjectPath>, cx: &mut ModelContext<Self>) {
5264        let new_active_entry = entry.and_then(|project_path| {
5265            let worktree = self.worktree_for_id(project_path.worktree_id, cx)?;
5266            let entry = worktree.read(cx).entry_for_path(project_path.path)?;
5267            Some(entry.id)
5268        });
5269        if new_active_entry != self.active_entry {
5270            self.active_entry = new_active_entry;
5271            cx.emit(Event::ActiveEntryChanged(new_active_entry));
5272        }
5273    }
5274
5275    pub fn language_servers_running_disk_based_diagnostics(
5276        &self,
5277    ) -> impl Iterator<Item = LanguageServerId> + '_ {
5278        self.language_server_statuses
5279            .iter()
5280            .filter_map(|(id, status)| {
5281                if status.has_pending_diagnostic_updates {
5282                    Some(*id)
5283                } else {
5284                    None
5285                }
5286            })
5287    }
5288
5289    pub fn diagnostic_summary(&self, cx: &AppContext) -> DiagnosticSummary {
5290        let mut summary = DiagnosticSummary::default();
5291        for (_, _, path_summary) in self.diagnostic_summaries(cx) {
5292            summary.error_count += path_summary.error_count;
5293            summary.warning_count += path_summary.warning_count;
5294        }
5295        summary
5296    }
5297
5298    pub fn diagnostic_summaries<'a>(
5299        &'a self,
5300        cx: &'a AppContext,
5301    ) -> impl Iterator<Item = (ProjectPath, LanguageServerId, DiagnosticSummary)> + 'a {
5302        self.visible_worktrees(cx).flat_map(move |worktree| {
5303            let worktree = worktree.read(cx);
5304            let worktree_id = worktree.id();
5305            worktree
5306                .diagnostic_summaries()
5307                .map(move |(path, server_id, summary)| {
5308                    (ProjectPath { worktree_id, path }, server_id, summary)
5309                })
5310        })
5311    }
5312
5313    pub fn disk_based_diagnostics_started(
5314        &mut self,
5315        language_server_id: LanguageServerId,
5316        cx: &mut ModelContext<Self>,
5317    ) {
5318        cx.emit(Event::DiskBasedDiagnosticsStarted { language_server_id });
5319    }
5320
5321    pub fn disk_based_diagnostics_finished(
5322        &mut self,
5323        language_server_id: LanguageServerId,
5324        cx: &mut ModelContext<Self>,
5325    ) {
5326        cx.emit(Event::DiskBasedDiagnosticsFinished { language_server_id });
5327    }
5328
5329    pub fn active_entry(&self) -> Option<ProjectEntryId> {
5330        self.active_entry
5331    }
5332
5333    pub fn entry_for_path(&self, path: &ProjectPath, cx: &AppContext) -> Option<Entry> {
5334        self.worktree_for_id(path.worktree_id, cx)?
5335            .read(cx)
5336            .entry_for_path(&path.path)
5337            .cloned()
5338    }
5339
5340    pub fn path_for_entry(&self, entry_id: ProjectEntryId, cx: &AppContext) -> Option<ProjectPath> {
5341        let worktree = self.worktree_for_entry(entry_id, cx)?;
5342        let worktree = worktree.read(cx);
5343        let worktree_id = worktree.id();
5344        let path = worktree.entry_for_id(entry_id)?.path.clone();
5345        Some(ProjectPath { worktree_id, path })
5346    }
5347
5348    // RPC message handlers
5349
5350    async fn handle_unshare_project(
5351        this: ModelHandle<Self>,
5352        _: TypedEnvelope<proto::UnshareProject>,
5353        _: Arc<Client>,
5354        mut cx: AsyncAppContext,
5355    ) -> Result<()> {
5356        this.update(&mut cx, |this, cx| {
5357            if this.is_local() {
5358                this.unshare(cx)?;
5359            } else {
5360                this.disconnected_from_host(cx);
5361            }
5362            Ok(())
5363        })
5364    }
5365
5366    async fn handle_add_collaborator(
5367        this: ModelHandle<Self>,
5368        mut envelope: TypedEnvelope<proto::AddProjectCollaborator>,
5369        _: Arc<Client>,
5370        mut cx: AsyncAppContext,
5371    ) -> Result<()> {
5372        let collaborator = envelope
5373            .payload
5374            .collaborator
5375            .take()
5376            .ok_or_else(|| anyhow!("empty collaborator"))?;
5377
5378        let collaborator = Collaborator::from_proto(collaborator)?;
5379        this.update(&mut cx, |this, cx| {
5380            this.shared_buffers.remove(&collaborator.peer_id);
5381            this.collaborators
5382                .insert(collaborator.peer_id, collaborator);
5383            cx.notify();
5384        });
5385
5386        Ok(())
5387    }
5388
5389    async fn handle_update_project_collaborator(
5390        this: ModelHandle<Self>,
5391        envelope: TypedEnvelope<proto::UpdateProjectCollaborator>,
5392        _: Arc<Client>,
5393        mut cx: AsyncAppContext,
5394    ) -> Result<()> {
5395        let old_peer_id = envelope
5396            .payload
5397            .old_peer_id
5398            .ok_or_else(|| anyhow!("missing old peer id"))?;
5399        let new_peer_id = envelope
5400            .payload
5401            .new_peer_id
5402            .ok_or_else(|| anyhow!("missing new peer id"))?;
5403        this.update(&mut cx, |this, cx| {
5404            let collaborator = this
5405                .collaborators
5406                .remove(&old_peer_id)
5407                .ok_or_else(|| anyhow!("received UpdateProjectCollaborator for unknown peer"))?;
5408            let is_host = collaborator.replica_id == 0;
5409            this.collaborators.insert(new_peer_id, collaborator);
5410
5411            let buffers = this.shared_buffers.remove(&old_peer_id);
5412            log::info!(
5413                "peer {} became {}. moving buffers {:?}",
5414                old_peer_id,
5415                new_peer_id,
5416                &buffers
5417            );
5418            if let Some(buffers) = buffers {
5419                this.shared_buffers.insert(new_peer_id, buffers);
5420            }
5421
5422            if is_host {
5423                this.opened_buffers
5424                    .retain(|_, buffer| !matches!(buffer, OpenBuffer::Operations(_)));
5425                this.buffer_ordered_messages_tx
5426                    .unbounded_send(BufferOrderedMessage::Resync)
5427                    .unwrap();
5428            }
5429
5430            cx.emit(Event::CollaboratorUpdated {
5431                old_peer_id,
5432                new_peer_id,
5433            });
5434            cx.notify();
5435            Ok(())
5436        })
5437    }
5438
5439    async fn handle_remove_collaborator(
5440        this: ModelHandle<Self>,
5441        envelope: TypedEnvelope<proto::RemoveProjectCollaborator>,
5442        _: Arc<Client>,
5443        mut cx: AsyncAppContext,
5444    ) -> Result<()> {
5445        this.update(&mut cx, |this, cx| {
5446            let peer_id = envelope
5447                .payload
5448                .peer_id
5449                .ok_or_else(|| anyhow!("invalid peer id"))?;
5450            let replica_id = this
5451                .collaborators
5452                .remove(&peer_id)
5453                .ok_or_else(|| anyhow!("unknown peer {:?}", peer_id))?
5454                .replica_id;
5455            for buffer in this.opened_buffers.values() {
5456                if let Some(buffer) = buffer.upgrade(cx) {
5457                    buffer.update(cx, |buffer, cx| buffer.remove_peer(replica_id, cx));
5458                }
5459            }
5460            this.shared_buffers.remove(&peer_id);
5461
5462            cx.emit(Event::CollaboratorLeft(peer_id));
5463            cx.notify();
5464            Ok(())
5465        })
5466    }
5467
5468    async fn handle_update_project(
5469        this: ModelHandle<Self>,
5470        envelope: TypedEnvelope<proto::UpdateProject>,
5471        _: Arc<Client>,
5472        mut cx: AsyncAppContext,
5473    ) -> Result<()> {
5474        this.update(&mut cx, |this, cx| {
5475            // Don't handle messages that were sent before the response to us joining the project
5476            if envelope.message_id > this.join_project_response_message_id {
5477                this.set_worktrees_from_proto(envelope.payload.worktrees, cx)?;
5478            }
5479            Ok(())
5480        })
5481    }
5482
5483    async fn handle_update_worktree(
5484        this: ModelHandle<Self>,
5485        envelope: TypedEnvelope<proto::UpdateWorktree>,
5486        _: Arc<Client>,
5487        mut cx: AsyncAppContext,
5488    ) -> Result<()> {
5489        this.update(&mut cx, |this, cx| {
5490            let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
5491            if let Some(worktree) = this.worktree_for_id(worktree_id, cx) {
5492                worktree.update(cx, |worktree, _| {
5493                    let worktree = worktree.as_remote_mut().unwrap();
5494                    worktree.update_from_remote(envelope.payload);
5495                });
5496            }
5497            Ok(())
5498        })
5499    }
5500
5501    async fn handle_update_worktree_settings(
5502        this: ModelHandle<Self>,
5503        envelope: TypedEnvelope<proto::UpdateWorktreeSettings>,
5504        _: Arc<Client>,
5505        mut cx: AsyncAppContext,
5506    ) -> Result<()> {
5507        this.update(&mut cx, |this, cx| {
5508            let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
5509            if let Some(worktree) = this.worktree_for_id(worktree_id, cx) {
5510                cx.update_global::<SettingsStore, _, _>(|store, cx| {
5511                    store
5512                        .set_local_settings(
5513                            worktree.id(),
5514                            PathBuf::from(&envelope.payload.path).into(),
5515                            envelope.payload.content.as_ref().map(String::as_str),
5516                            cx,
5517                        )
5518                        .log_err();
5519                });
5520            }
5521            Ok(())
5522        })
5523    }
5524
5525    async fn handle_create_project_entry(
5526        this: ModelHandle<Self>,
5527        envelope: TypedEnvelope<proto::CreateProjectEntry>,
5528        _: Arc<Client>,
5529        mut cx: AsyncAppContext,
5530    ) -> Result<proto::ProjectEntryResponse> {
5531        let worktree = this.update(&mut cx, |this, cx| {
5532            let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
5533            this.worktree_for_id(worktree_id, cx)
5534                .ok_or_else(|| anyhow!("worktree not found"))
5535        })?;
5536        let worktree_scan_id = worktree.read_with(&cx, |worktree, _| worktree.scan_id());
5537        let entry = worktree
5538            .update(&mut cx, |worktree, cx| {
5539                let worktree = worktree.as_local_mut().unwrap();
5540                let path = PathBuf::from(envelope.payload.path);
5541                worktree.create_entry(path, envelope.payload.is_directory, cx)
5542            })
5543            .await?;
5544        Ok(proto::ProjectEntryResponse {
5545            entry: Some((&entry).into()),
5546            worktree_scan_id: worktree_scan_id as u64,
5547        })
5548    }
5549
5550    async fn handle_rename_project_entry(
5551        this: ModelHandle<Self>,
5552        envelope: TypedEnvelope<proto::RenameProjectEntry>,
5553        _: Arc<Client>,
5554        mut cx: AsyncAppContext,
5555    ) -> Result<proto::ProjectEntryResponse> {
5556        let entry_id = ProjectEntryId::from_proto(envelope.payload.entry_id);
5557        let worktree = this.read_with(&cx, |this, cx| {
5558            this.worktree_for_entry(entry_id, cx)
5559                .ok_or_else(|| anyhow!("worktree not found"))
5560        })?;
5561        let worktree_scan_id = worktree.read_with(&cx, |worktree, _| worktree.scan_id());
5562        let entry = worktree
5563            .update(&mut cx, |worktree, cx| {
5564                let new_path = PathBuf::from(envelope.payload.new_path);
5565                worktree
5566                    .as_local_mut()
5567                    .unwrap()
5568                    .rename_entry(entry_id, new_path, cx)
5569                    .ok_or_else(|| anyhow!("invalid entry"))
5570            })?
5571            .await?;
5572        Ok(proto::ProjectEntryResponse {
5573            entry: Some((&entry).into()),
5574            worktree_scan_id: worktree_scan_id as u64,
5575        })
5576    }
5577
5578    async fn handle_copy_project_entry(
5579        this: ModelHandle<Self>,
5580        envelope: TypedEnvelope<proto::CopyProjectEntry>,
5581        _: Arc<Client>,
5582        mut cx: AsyncAppContext,
5583    ) -> Result<proto::ProjectEntryResponse> {
5584        let entry_id = ProjectEntryId::from_proto(envelope.payload.entry_id);
5585        let worktree = this.read_with(&cx, |this, cx| {
5586            this.worktree_for_entry(entry_id, cx)
5587                .ok_or_else(|| anyhow!("worktree not found"))
5588        })?;
5589        let worktree_scan_id = worktree.read_with(&cx, |worktree, _| worktree.scan_id());
5590        let entry = worktree
5591            .update(&mut cx, |worktree, cx| {
5592                let new_path = PathBuf::from(envelope.payload.new_path);
5593                worktree
5594                    .as_local_mut()
5595                    .unwrap()
5596                    .copy_entry(entry_id, new_path, cx)
5597                    .ok_or_else(|| anyhow!("invalid entry"))
5598            })?
5599            .await?;
5600        Ok(proto::ProjectEntryResponse {
5601            entry: Some((&entry).into()),
5602            worktree_scan_id: worktree_scan_id as u64,
5603        })
5604    }
5605
5606    async fn handle_delete_project_entry(
5607        this: ModelHandle<Self>,
5608        envelope: TypedEnvelope<proto::DeleteProjectEntry>,
5609        _: Arc<Client>,
5610        mut cx: AsyncAppContext,
5611    ) -> Result<proto::ProjectEntryResponse> {
5612        let entry_id = ProjectEntryId::from_proto(envelope.payload.entry_id);
5613
5614        this.update(&mut cx, |_, cx| cx.emit(Event::DeletedEntry(entry_id)));
5615
5616        let worktree = this.read_with(&cx, |this, cx| {
5617            this.worktree_for_entry(entry_id, cx)
5618                .ok_or_else(|| anyhow!("worktree not found"))
5619        })?;
5620        let worktree_scan_id = worktree.read_with(&cx, |worktree, _| worktree.scan_id());
5621        worktree
5622            .update(&mut cx, |worktree, cx| {
5623                worktree
5624                    .as_local_mut()
5625                    .unwrap()
5626                    .delete_entry(entry_id, cx)
5627                    .ok_or_else(|| anyhow!("invalid entry"))
5628            })?
5629            .await?;
5630        Ok(proto::ProjectEntryResponse {
5631            entry: None,
5632            worktree_scan_id: worktree_scan_id as u64,
5633        })
5634    }
5635
5636    async fn handle_update_diagnostic_summary(
5637        this: ModelHandle<Self>,
5638        envelope: TypedEnvelope<proto::UpdateDiagnosticSummary>,
5639        _: Arc<Client>,
5640        mut cx: AsyncAppContext,
5641    ) -> Result<()> {
5642        this.update(&mut cx, |this, cx| {
5643            let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
5644            if let Some(worktree) = this.worktree_for_id(worktree_id, cx) {
5645                if let Some(summary) = envelope.payload.summary {
5646                    let project_path = ProjectPath {
5647                        worktree_id,
5648                        path: Path::new(&summary.path).into(),
5649                    };
5650                    worktree.update(cx, |worktree, _| {
5651                        worktree
5652                            .as_remote_mut()
5653                            .unwrap()
5654                            .update_diagnostic_summary(project_path.path.clone(), &summary);
5655                    });
5656                    cx.emit(Event::DiagnosticsUpdated {
5657                        language_server_id: LanguageServerId(summary.language_server_id as usize),
5658                        path: project_path,
5659                    });
5660                }
5661            }
5662            Ok(())
5663        })
5664    }
5665
5666    async fn handle_start_language_server(
5667        this: ModelHandle<Self>,
5668        envelope: TypedEnvelope<proto::StartLanguageServer>,
5669        _: Arc<Client>,
5670        mut cx: AsyncAppContext,
5671    ) -> Result<()> {
5672        let server = envelope
5673            .payload
5674            .server
5675            .ok_or_else(|| anyhow!("invalid server"))?;
5676        this.update(&mut cx, |this, cx| {
5677            this.language_server_statuses.insert(
5678                LanguageServerId(server.id as usize),
5679                LanguageServerStatus {
5680                    name: server.name,
5681                    pending_work: Default::default(),
5682                    has_pending_diagnostic_updates: false,
5683                    progress_tokens: Default::default(),
5684                },
5685            );
5686            cx.notify();
5687        });
5688        Ok(())
5689    }
5690
5691    async fn handle_update_language_server(
5692        this: ModelHandle<Self>,
5693        envelope: TypedEnvelope<proto::UpdateLanguageServer>,
5694        _: Arc<Client>,
5695        mut cx: AsyncAppContext,
5696    ) -> Result<()> {
5697        this.update(&mut cx, |this, cx| {
5698            let language_server_id = LanguageServerId(envelope.payload.language_server_id as usize);
5699
5700            match envelope
5701                .payload
5702                .variant
5703                .ok_or_else(|| anyhow!("invalid variant"))?
5704            {
5705                proto::update_language_server::Variant::WorkStart(payload) => {
5706                    this.on_lsp_work_start(
5707                        language_server_id,
5708                        payload.token,
5709                        LanguageServerProgress {
5710                            message: payload.message,
5711                            percentage: payload.percentage.map(|p| p as usize),
5712                            last_update_at: Instant::now(),
5713                        },
5714                        cx,
5715                    );
5716                }
5717
5718                proto::update_language_server::Variant::WorkProgress(payload) => {
5719                    this.on_lsp_work_progress(
5720                        language_server_id,
5721                        payload.token,
5722                        LanguageServerProgress {
5723                            message: payload.message,
5724                            percentage: payload.percentage.map(|p| p as usize),
5725                            last_update_at: Instant::now(),
5726                        },
5727                        cx,
5728                    );
5729                }
5730
5731                proto::update_language_server::Variant::WorkEnd(payload) => {
5732                    this.on_lsp_work_end(language_server_id, payload.token, cx);
5733                }
5734
5735                proto::update_language_server::Variant::DiskBasedDiagnosticsUpdating(_) => {
5736                    this.disk_based_diagnostics_started(language_server_id, cx);
5737                }
5738
5739                proto::update_language_server::Variant::DiskBasedDiagnosticsUpdated(_) => {
5740                    this.disk_based_diagnostics_finished(language_server_id, cx)
5741                }
5742            }
5743
5744            Ok(())
5745        })
5746    }
5747
5748    async fn handle_update_buffer(
5749        this: ModelHandle<Self>,
5750        envelope: TypedEnvelope<proto::UpdateBuffer>,
5751        _: Arc<Client>,
5752        mut cx: AsyncAppContext,
5753    ) -> Result<proto::Ack> {
5754        this.update(&mut cx, |this, cx| {
5755            let payload = envelope.payload.clone();
5756            let buffer_id = payload.buffer_id;
5757            let ops = payload
5758                .operations
5759                .into_iter()
5760                .map(language::proto::deserialize_operation)
5761                .collect::<Result<Vec<_>, _>>()?;
5762            let is_remote = this.is_remote();
5763            match this.opened_buffers.entry(buffer_id) {
5764                hash_map::Entry::Occupied(mut e) => match e.get_mut() {
5765                    OpenBuffer::Strong(buffer) => {
5766                        buffer.update(cx, |buffer, cx| buffer.apply_ops(ops, cx))?;
5767                    }
5768                    OpenBuffer::Operations(operations) => operations.extend_from_slice(&ops),
5769                    OpenBuffer::Weak(_) => {}
5770                },
5771                hash_map::Entry::Vacant(e) => {
5772                    assert!(
5773                        is_remote,
5774                        "received buffer update from {:?}",
5775                        envelope.original_sender_id
5776                    );
5777                    e.insert(OpenBuffer::Operations(ops));
5778                }
5779            }
5780            Ok(proto::Ack {})
5781        })
5782    }
5783
5784    async fn handle_create_buffer_for_peer(
5785        this: ModelHandle<Self>,
5786        envelope: TypedEnvelope<proto::CreateBufferForPeer>,
5787        _: Arc<Client>,
5788        mut cx: AsyncAppContext,
5789    ) -> Result<()> {
5790        this.update(&mut cx, |this, cx| {
5791            match envelope
5792                .payload
5793                .variant
5794                .ok_or_else(|| anyhow!("missing variant"))?
5795            {
5796                proto::create_buffer_for_peer::Variant::State(mut state) => {
5797                    let mut buffer_file = None;
5798                    if let Some(file) = state.file.take() {
5799                        let worktree_id = WorktreeId::from_proto(file.worktree_id);
5800                        let worktree = this.worktree_for_id(worktree_id, cx).ok_or_else(|| {
5801                            anyhow!("no worktree found for id {}", file.worktree_id)
5802                        })?;
5803                        buffer_file = Some(Arc::new(File::from_proto(file, worktree.clone(), cx)?)
5804                            as Arc<dyn language::File>);
5805                    }
5806
5807                    let buffer_id = state.id;
5808                    let buffer = cx.add_model(|_| {
5809                        Buffer::from_proto(this.replica_id(), state, buffer_file).unwrap()
5810                    });
5811                    this.incomplete_remote_buffers
5812                        .insert(buffer_id, Some(buffer));
5813                }
5814                proto::create_buffer_for_peer::Variant::Chunk(chunk) => {
5815                    let buffer = this
5816                        .incomplete_remote_buffers
5817                        .get(&chunk.buffer_id)
5818                        .cloned()
5819                        .flatten()
5820                        .ok_or_else(|| {
5821                            anyhow!(
5822                                "received chunk for buffer {} without initial state",
5823                                chunk.buffer_id
5824                            )
5825                        })?;
5826                    let operations = chunk
5827                        .operations
5828                        .into_iter()
5829                        .map(language::proto::deserialize_operation)
5830                        .collect::<Result<Vec<_>>>()?;
5831                    buffer.update(cx, |buffer, cx| buffer.apply_ops(operations, cx))?;
5832
5833                    if chunk.is_last {
5834                        this.incomplete_remote_buffers.remove(&chunk.buffer_id);
5835                        this.register_buffer(&buffer, cx)?;
5836                    }
5837                }
5838            }
5839
5840            Ok(())
5841        })
5842    }
5843
5844    async fn handle_update_diff_base(
5845        this: ModelHandle<Self>,
5846        envelope: TypedEnvelope<proto::UpdateDiffBase>,
5847        _: Arc<Client>,
5848        mut cx: AsyncAppContext,
5849    ) -> Result<()> {
5850        this.update(&mut cx, |this, cx| {
5851            let buffer_id = envelope.payload.buffer_id;
5852            let diff_base = envelope.payload.diff_base;
5853            if let Some(buffer) = this
5854                .opened_buffers
5855                .get_mut(&buffer_id)
5856                .and_then(|b| b.upgrade(cx))
5857                .or_else(|| {
5858                    this.incomplete_remote_buffers
5859                        .get(&buffer_id)
5860                        .cloned()
5861                        .flatten()
5862                })
5863            {
5864                buffer.update(cx, |buffer, cx| buffer.set_diff_base(diff_base, cx));
5865            }
5866            Ok(())
5867        })
5868    }
5869
5870    async fn handle_update_buffer_file(
5871        this: ModelHandle<Self>,
5872        envelope: TypedEnvelope<proto::UpdateBufferFile>,
5873        _: Arc<Client>,
5874        mut cx: AsyncAppContext,
5875    ) -> Result<()> {
5876        let buffer_id = envelope.payload.buffer_id;
5877
5878        this.update(&mut cx, |this, cx| {
5879            let payload = envelope.payload.clone();
5880            if let Some(buffer) = this
5881                .opened_buffers
5882                .get(&buffer_id)
5883                .and_then(|b| b.upgrade(cx))
5884                .or_else(|| {
5885                    this.incomplete_remote_buffers
5886                        .get(&buffer_id)
5887                        .cloned()
5888                        .flatten()
5889                })
5890            {
5891                let file = payload.file.ok_or_else(|| anyhow!("invalid file"))?;
5892                let worktree = this
5893                    .worktree_for_id(WorktreeId::from_proto(file.worktree_id), cx)
5894                    .ok_or_else(|| anyhow!("no such worktree"))?;
5895                let file = File::from_proto(file, worktree, cx)?;
5896                buffer.update(cx, |buffer, cx| {
5897                    buffer.file_updated(Arc::new(file), cx).detach();
5898                });
5899                this.detect_language_for_buffer(&buffer, cx);
5900            }
5901            Ok(())
5902        })
5903    }
5904
5905    async fn handle_save_buffer(
5906        this: ModelHandle<Self>,
5907        envelope: TypedEnvelope<proto::SaveBuffer>,
5908        _: Arc<Client>,
5909        mut cx: AsyncAppContext,
5910    ) -> Result<proto::BufferSaved> {
5911        let buffer_id = envelope.payload.buffer_id;
5912        let (project_id, buffer) = this.update(&mut cx, |this, cx| {
5913            let project_id = this.remote_id().ok_or_else(|| anyhow!("not connected"))?;
5914            let buffer = this
5915                .opened_buffers
5916                .get(&buffer_id)
5917                .and_then(|buffer| buffer.upgrade(cx))
5918                .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))?;
5919            anyhow::Ok((project_id, buffer))
5920        })?;
5921        buffer
5922            .update(&mut cx, |buffer, _| {
5923                buffer.wait_for_version(deserialize_version(&envelope.payload.version))
5924            })
5925            .await?;
5926        let buffer_id = buffer.read_with(&cx, |buffer, _| buffer.remote_id());
5927
5928        let (saved_version, fingerprint, mtime) = this
5929            .update(&mut cx, |this, cx| this.save_buffer(buffer, cx))
5930            .await?;
5931        Ok(proto::BufferSaved {
5932            project_id,
5933            buffer_id,
5934            version: serialize_version(&saved_version),
5935            mtime: Some(mtime.into()),
5936            fingerprint: language::proto::serialize_fingerprint(fingerprint),
5937        })
5938    }
5939
5940    async fn handle_reload_buffers(
5941        this: ModelHandle<Self>,
5942        envelope: TypedEnvelope<proto::ReloadBuffers>,
5943        _: Arc<Client>,
5944        mut cx: AsyncAppContext,
5945    ) -> Result<proto::ReloadBuffersResponse> {
5946        let sender_id = envelope.original_sender_id()?;
5947        let reload = this.update(&mut cx, |this, cx| {
5948            let mut buffers = HashSet::default();
5949            for buffer_id in &envelope.payload.buffer_ids {
5950                buffers.insert(
5951                    this.opened_buffers
5952                        .get(buffer_id)
5953                        .and_then(|buffer| buffer.upgrade(cx))
5954                        .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))?,
5955                );
5956            }
5957            Ok::<_, anyhow::Error>(this.reload_buffers(buffers, false, cx))
5958        })?;
5959
5960        let project_transaction = reload.await?;
5961        let project_transaction = this.update(&mut cx, |this, cx| {
5962            this.serialize_project_transaction_for_peer(project_transaction, sender_id, cx)
5963        });
5964        Ok(proto::ReloadBuffersResponse {
5965            transaction: Some(project_transaction),
5966        })
5967    }
5968
5969    async fn handle_synchronize_buffers(
5970        this: ModelHandle<Self>,
5971        envelope: TypedEnvelope<proto::SynchronizeBuffers>,
5972        _: Arc<Client>,
5973        mut cx: AsyncAppContext,
5974    ) -> Result<proto::SynchronizeBuffersResponse> {
5975        let project_id = envelope.payload.project_id;
5976        let mut response = proto::SynchronizeBuffersResponse {
5977            buffers: Default::default(),
5978        };
5979
5980        this.update(&mut cx, |this, cx| {
5981            let Some(guest_id) = envelope.original_sender_id else {
5982                log::error!("missing original_sender_id on SynchronizeBuffers request");
5983                return;
5984            };
5985
5986            this.shared_buffers.entry(guest_id).or_default().clear();
5987            for buffer in envelope.payload.buffers {
5988                let buffer_id = buffer.id;
5989                let remote_version = language::proto::deserialize_version(&buffer.version);
5990                if let Some(buffer) = this.buffer_for_id(buffer_id, cx) {
5991                    this.shared_buffers
5992                        .entry(guest_id)
5993                        .or_default()
5994                        .insert(buffer_id);
5995
5996                    let buffer = buffer.read(cx);
5997                    response.buffers.push(proto::BufferVersion {
5998                        id: buffer_id,
5999                        version: language::proto::serialize_version(&buffer.version),
6000                    });
6001
6002                    let operations = buffer.serialize_ops(Some(remote_version), cx);
6003                    let client = this.client.clone();
6004                    if let Some(file) = buffer.file() {
6005                        client
6006                            .send(proto::UpdateBufferFile {
6007                                project_id,
6008                                buffer_id: buffer_id as u64,
6009                                file: Some(file.to_proto()),
6010                            })
6011                            .log_err();
6012                    }
6013
6014                    client
6015                        .send(proto::UpdateDiffBase {
6016                            project_id,
6017                            buffer_id: buffer_id as u64,
6018                            diff_base: buffer.diff_base().map(Into::into),
6019                        })
6020                        .log_err();
6021
6022                    client
6023                        .send(proto::BufferReloaded {
6024                            project_id,
6025                            buffer_id,
6026                            version: language::proto::serialize_version(buffer.saved_version()),
6027                            mtime: Some(buffer.saved_mtime().into()),
6028                            fingerprint: language::proto::serialize_fingerprint(
6029                                buffer.saved_version_fingerprint(),
6030                            ),
6031                            line_ending: language::proto::serialize_line_ending(
6032                                buffer.line_ending(),
6033                            ) as i32,
6034                        })
6035                        .log_err();
6036
6037                    cx.background()
6038                        .spawn(
6039                            async move {
6040                                let operations = operations.await;
6041                                for chunk in split_operations(operations) {
6042                                    client
6043                                        .request(proto::UpdateBuffer {
6044                                            project_id,
6045                                            buffer_id,
6046                                            operations: chunk,
6047                                        })
6048                                        .await?;
6049                                }
6050                                anyhow::Ok(())
6051                            }
6052                            .log_err(),
6053                        )
6054                        .detach();
6055                }
6056            }
6057        });
6058
6059        Ok(response)
6060    }
6061
6062    async fn handle_format_buffers(
6063        this: ModelHandle<Self>,
6064        envelope: TypedEnvelope<proto::FormatBuffers>,
6065        _: Arc<Client>,
6066        mut cx: AsyncAppContext,
6067    ) -> Result<proto::FormatBuffersResponse> {
6068        let sender_id = envelope.original_sender_id()?;
6069        let format = this.update(&mut cx, |this, cx| {
6070            let mut buffers = HashSet::default();
6071            for buffer_id in &envelope.payload.buffer_ids {
6072                buffers.insert(
6073                    this.opened_buffers
6074                        .get(buffer_id)
6075                        .and_then(|buffer| buffer.upgrade(cx))
6076                        .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))?,
6077                );
6078            }
6079            let trigger = FormatTrigger::from_proto(envelope.payload.trigger);
6080            Ok::<_, anyhow::Error>(this.format(buffers, false, trigger, cx))
6081        })?;
6082
6083        let project_transaction = format.await?;
6084        let project_transaction = this.update(&mut cx, |this, cx| {
6085            this.serialize_project_transaction_for_peer(project_transaction, sender_id, cx)
6086        });
6087        Ok(proto::FormatBuffersResponse {
6088            transaction: Some(project_transaction),
6089        })
6090    }
6091
6092    async fn handle_apply_additional_edits_for_completion(
6093        this: ModelHandle<Self>,
6094        envelope: TypedEnvelope<proto::ApplyCompletionAdditionalEdits>,
6095        _: Arc<Client>,
6096        mut cx: AsyncAppContext,
6097    ) -> Result<proto::ApplyCompletionAdditionalEditsResponse> {
6098        let (buffer, completion) = this.update(&mut cx, |this, cx| {
6099            let buffer = this
6100                .opened_buffers
6101                .get(&envelope.payload.buffer_id)
6102                .and_then(|buffer| buffer.upgrade(cx))
6103                .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))?;
6104            let language = buffer.read(cx).language();
6105            let completion = language::proto::deserialize_completion(
6106                envelope
6107                    .payload
6108                    .completion
6109                    .ok_or_else(|| anyhow!("invalid completion"))?,
6110                language.cloned(),
6111            );
6112            Ok::<_, anyhow::Error>((buffer, completion))
6113        })?;
6114
6115        let completion = completion.await?;
6116
6117        let apply_additional_edits = this.update(&mut cx, |this, cx| {
6118            this.apply_additional_edits_for_completion(buffer, completion, false, cx)
6119        });
6120
6121        Ok(proto::ApplyCompletionAdditionalEditsResponse {
6122            transaction: apply_additional_edits
6123                .await?
6124                .as_ref()
6125                .map(language::proto::serialize_transaction),
6126        })
6127    }
6128
6129    async fn handle_apply_code_action(
6130        this: ModelHandle<Self>,
6131        envelope: TypedEnvelope<proto::ApplyCodeAction>,
6132        _: Arc<Client>,
6133        mut cx: AsyncAppContext,
6134    ) -> Result<proto::ApplyCodeActionResponse> {
6135        let sender_id = envelope.original_sender_id()?;
6136        let action = language::proto::deserialize_code_action(
6137            envelope
6138                .payload
6139                .action
6140                .ok_or_else(|| anyhow!("invalid action"))?,
6141        )?;
6142        let apply_code_action = this.update(&mut cx, |this, cx| {
6143            let buffer = this
6144                .opened_buffers
6145                .get(&envelope.payload.buffer_id)
6146                .and_then(|buffer| buffer.upgrade(cx))
6147                .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))?;
6148            Ok::<_, anyhow::Error>(this.apply_code_action(buffer, action, false, cx))
6149        })?;
6150
6151        let project_transaction = apply_code_action.await?;
6152        let project_transaction = this.update(&mut cx, |this, cx| {
6153            this.serialize_project_transaction_for_peer(project_transaction, sender_id, cx)
6154        });
6155        Ok(proto::ApplyCodeActionResponse {
6156            transaction: Some(project_transaction),
6157        })
6158    }
6159
6160    async fn handle_on_type_formatting(
6161        this: ModelHandle<Self>,
6162        envelope: TypedEnvelope<proto::OnTypeFormatting>,
6163        _: Arc<Client>,
6164        mut cx: AsyncAppContext,
6165    ) -> Result<proto::OnTypeFormattingResponse> {
6166        let on_type_formatting = this.update(&mut cx, |this, cx| {
6167            let buffer = this
6168                .opened_buffers
6169                .get(&envelope.payload.buffer_id)
6170                .and_then(|buffer| buffer.upgrade(cx))
6171                .ok_or_else(|| anyhow!("unknown buffer id {}", envelope.payload.buffer_id))?;
6172            let position = envelope
6173                .payload
6174                .position
6175                .and_then(deserialize_anchor)
6176                .ok_or_else(|| anyhow!("invalid position"))?;
6177            Ok::<_, anyhow::Error>(this.apply_on_type_formatting(
6178                buffer,
6179                position,
6180                envelope.payload.trigger.clone(),
6181                cx,
6182            ))
6183        })?;
6184
6185        let transaction = on_type_formatting
6186            .await?
6187            .as_ref()
6188            .map(language::proto::serialize_transaction);
6189        Ok(proto::OnTypeFormattingResponse { transaction })
6190    }
6191
6192    async fn handle_lsp_command<T: LspCommand>(
6193        this: ModelHandle<Self>,
6194        envelope: TypedEnvelope<T::ProtoRequest>,
6195        _: Arc<Client>,
6196        mut cx: AsyncAppContext,
6197    ) -> Result<<T::ProtoRequest as proto::RequestMessage>::Response>
6198    where
6199        <T::LspRequest as lsp::request::Request>::Result: Send,
6200    {
6201        let sender_id = envelope.original_sender_id()?;
6202        let buffer_id = T::buffer_id_from_proto(&envelope.payload);
6203        let buffer_handle = this.read_with(&cx, |this, _| {
6204            this.opened_buffers
6205                .get(&buffer_id)
6206                .and_then(|buffer| buffer.upgrade(&cx))
6207                .ok_or_else(|| anyhow!("unknown buffer id {}", buffer_id))
6208        })?;
6209        let request = T::from_proto(
6210            envelope.payload,
6211            this.clone(),
6212            buffer_handle.clone(),
6213            cx.clone(),
6214        )
6215        .await?;
6216        let buffer_version = buffer_handle.read_with(&cx, |buffer, _| buffer.version());
6217        let response = this
6218            .update(&mut cx, |this, cx| {
6219                this.request_lsp(buffer_handle, request, cx)
6220            })
6221            .await?;
6222        this.update(&mut cx, |this, cx| {
6223            Ok(T::response_to_proto(
6224                response,
6225                this,
6226                sender_id,
6227                &buffer_version,
6228                cx,
6229            ))
6230        })
6231    }
6232
6233    async fn handle_get_project_symbols(
6234        this: ModelHandle<Self>,
6235        envelope: TypedEnvelope<proto::GetProjectSymbols>,
6236        _: Arc<Client>,
6237        mut cx: AsyncAppContext,
6238    ) -> Result<proto::GetProjectSymbolsResponse> {
6239        let symbols = this
6240            .update(&mut cx, |this, cx| {
6241                this.symbols(&envelope.payload.query, cx)
6242            })
6243            .await?;
6244
6245        Ok(proto::GetProjectSymbolsResponse {
6246            symbols: symbols.iter().map(serialize_symbol).collect(),
6247        })
6248    }
6249
6250    async fn handle_search_project(
6251        this: ModelHandle<Self>,
6252        envelope: TypedEnvelope<proto::SearchProject>,
6253        _: Arc<Client>,
6254        mut cx: AsyncAppContext,
6255    ) -> Result<proto::SearchProjectResponse> {
6256        let peer_id = envelope.original_sender_id()?;
6257        let query = SearchQuery::from_proto(envelope.payload)?;
6258        let result = this
6259            .update(&mut cx, |this, cx| this.search(query, cx))
6260            .await?;
6261
6262        this.update(&mut cx, |this, cx| {
6263            let mut locations = Vec::new();
6264            for (buffer, ranges) in result {
6265                for range in ranges {
6266                    let start = serialize_anchor(&range.start);
6267                    let end = serialize_anchor(&range.end);
6268                    let buffer_id = this.create_buffer_for_peer(&buffer, peer_id, cx);
6269                    locations.push(proto::Location {
6270                        buffer_id,
6271                        start: Some(start),
6272                        end: Some(end),
6273                    });
6274                }
6275            }
6276            Ok(proto::SearchProjectResponse { locations })
6277        })
6278    }
6279
6280    async fn handle_open_buffer_for_symbol(
6281        this: ModelHandle<Self>,
6282        envelope: TypedEnvelope<proto::OpenBufferForSymbol>,
6283        _: Arc<Client>,
6284        mut cx: AsyncAppContext,
6285    ) -> Result<proto::OpenBufferForSymbolResponse> {
6286        let peer_id = envelope.original_sender_id()?;
6287        let symbol = envelope
6288            .payload
6289            .symbol
6290            .ok_or_else(|| anyhow!("invalid symbol"))?;
6291        let symbol = this
6292            .read_with(&cx, |this, _| this.deserialize_symbol(symbol))
6293            .await?;
6294        let symbol = this.read_with(&cx, |this, _| {
6295            let signature = this.symbol_signature(&symbol.path);
6296            if signature == symbol.signature {
6297                Ok(symbol)
6298            } else {
6299                Err(anyhow!("invalid symbol signature"))
6300            }
6301        })?;
6302        let buffer = this
6303            .update(&mut cx, |this, cx| this.open_buffer_for_symbol(&symbol, cx))
6304            .await?;
6305
6306        Ok(proto::OpenBufferForSymbolResponse {
6307            buffer_id: this.update(&mut cx, |this, cx| {
6308                this.create_buffer_for_peer(&buffer, peer_id, cx)
6309            }),
6310        })
6311    }
6312
6313    fn symbol_signature(&self, project_path: &ProjectPath) -> [u8; 32] {
6314        let mut hasher = Sha256::new();
6315        hasher.update(project_path.worktree_id.to_proto().to_be_bytes());
6316        hasher.update(project_path.path.to_string_lossy().as_bytes());
6317        hasher.update(self.nonce.to_be_bytes());
6318        hasher.finalize().as_slice().try_into().unwrap()
6319    }
6320
6321    async fn handle_open_buffer_by_id(
6322        this: ModelHandle<Self>,
6323        envelope: TypedEnvelope<proto::OpenBufferById>,
6324        _: Arc<Client>,
6325        mut cx: AsyncAppContext,
6326    ) -> Result<proto::OpenBufferResponse> {
6327        let peer_id = envelope.original_sender_id()?;
6328        let buffer = this
6329            .update(&mut cx, |this, cx| {
6330                this.open_buffer_by_id(envelope.payload.id, cx)
6331            })
6332            .await?;
6333        this.update(&mut cx, |this, cx| {
6334            Ok(proto::OpenBufferResponse {
6335                buffer_id: this.create_buffer_for_peer(&buffer, peer_id, cx),
6336            })
6337        })
6338    }
6339
6340    async fn handle_open_buffer_by_path(
6341        this: ModelHandle<Self>,
6342        envelope: TypedEnvelope<proto::OpenBufferByPath>,
6343        _: Arc<Client>,
6344        mut cx: AsyncAppContext,
6345    ) -> Result<proto::OpenBufferResponse> {
6346        let peer_id = envelope.original_sender_id()?;
6347        let worktree_id = WorktreeId::from_proto(envelope.payload.worktree_id);
6348        let open_buffer = this.update(&mut cx, |this, cx| {
6349            this.open_buffer(
6350                ProjectPath {
6351                    worktree_id,
6352                    path: PathBuf::from(envelope.payload.path).into(),
6353                },
6354                cx,
6355            )
6356        });
6357
6358        let buffer = open_buffer.await?;
6359        this.update(&mut cx, |this, cx| {
6360            Ok(proto::OpenBufferResponse {
6361                buffer_id: this.create_buffer_for_peer(&buffer, peer_id, cx),
6362            })
6363        })
6364    }
6365
6366    fn serialize_project_transaction_for_peer(
6367        &mut self,
6368        project_transaction: ProjectTransaction,
6369        peer_id: proto::PeerId,
6370        cx: &mut AppContext,
6371    ) -> proto::ProjectTransaction {
6372        let mut serialized_transaction = proto::ProjectTransaction {
6373            buffer_ids: Default::default(),
6374            transactions: Default::default(),
6375        };
6376        for (buffer, transaction) in project_transaction.0 {
6377            serialized_transaction
6378                .buffer_ids
6379                .push(self.create_buffer_for_peer(&buffer, peer_id, cx));
6380            serialized_transaction
6381                .transactions
6382                .push(language::proto::serialize_transaction(&transaction));
6383        }
6384        serialized_transaction
6385    }
6386
6387    fn deserialize_project_transaction(
6388        &mut self,
6389        message: proto::ProjectTransaction,
6390        push_to_history: bool,
6391        cx: &mut ModelContext<Self>,
6392    ) -> Task<Result<ProjectTransaction>> {
6393        cx.spawn(|this, mut cx| async move {
6394            let mut project_transaction = ProjectTransaction::default();
6395            for (buffer_id, transaction) in message.buffer_ids.into_iter().zip(message.transactions)
6396            {
6397                let buffer = this
6398                    .update(&mut cx, |this, cx| {
6399                        this.wait_for_remote_buffer(buffer_id, cx)
6400                    })
6401                    .await?;
6402                let transaction = language::proto::deserialize_transaction(transaction)?;
6403                project_transaction.0.insert(buffer, transaction);
6404            }
6405
6406            for (buffer, transaction) in &project_transaction.0 {
6407                buffer
6408                    .update(&mut cx, |buffer, _| {
6409                        buffer.wait_for_edits(transaction.edit_ids.iter().copied())
6410                    })
6411                    .await?;
6412
6413                if push_to_history {
6414                    buffer.update(&mut cx, |buffer, _| {
6415                        buffer.push_transaction(transaction.clone(), Instant::now());
6416                    });
6417                }
6418            }
6419
6420            Ok(project_transaction)
6421        })
6422    }
6423
6424    fn create_buffer_for_peer(
6425        &mut self,
6426        buffer: &ModelHandle<Buffer>,
6427        peer_id: proto::PeerId,
6428        cx: &mut AppContext,
6429    ) -> u64 {
6430        let buffer_id = buffer.read(cx).remote_id();
6431        if let Some(ProjectClientState::Local { updates_tx, .. }) = &self.client_state {
6432            updates_tx
6433                .unbounded_send(LocalProjectUpdate::CreateBufferForPeer { peer_id, buffer_id })
6434                .ok();
6435        }
6436        buffer_id
6437    }
6438
6439    fn wait_for_remote_buffer(
6440        &mut self,
6441        id: u64,
6442        cx: &mut ModelContext<Self>,
6443    ) -> Task<Result<ModelHandle<Buffer>>> {
6444        let mut opened_buffer_rx = self.opened_buffer.1.clone();
6445
6446        cx.spawn_weak(|this, mut cx| async move {
6447            let buffer = loop {
6448                let Some(this) = this.upgrade(&cx) else {
6449                    return Err(anyhow!("project dropped"));
6450                };
6451
6452                let buffer = this.read_with(&cx, |this, cx| {
6453                    this.opened_buffers
6454                        .get(&id)
6455                        .and_then(|buffer| buffer.upgrade(cx))
6456                });
6457
6458                if let Some(buffer) = buffer {
6459                    break buffer;
6460                } else if this.read_with(&cx, |this, _| this.is_read_only()) {
6461                    return Err(anyhow!("disconnected before buffer {} could be opened", id));
6462                }
6463
6464                this.update(&mut cx, |this, _| {
6465                    this.incomplete_remote_buffers.entry(id).or_default();
6466                });
6467                drop(this);
6468
6469                opened_buffer_rx
6470                    .next()
6471                    .await
6472                    .ok_or_else(|| anyhow!("project dropped while waiting for buffer"))?;
6473            };
6474
6475            Ok(buffer)
6476        })
6477    }
6478
6479    fn synchronize_remote_buffers(&mut self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
6480        let project_id = match self.client_state.as_ref() {
6481            Some(ProjectClientState::Remote {
6482                sharing_has_stopped,
6483                remote_id,
6484                ..
6485            }) => {
6486                if *sharing_has_stopped {
6487                    return Task::ready(Err(anyhow!(
6488                        "can't synchronize remote buffers on a readonly project"
6489                    )));
6490                } else {
6491                    *remote_id
6492                }
6493            }
6494            Some(ProjectClientState::Local { .. }) | None => {
6495                return Task::ready(Err(anyhow!(
6496                    "can't synchronize remote buffers on a local project"
6497                )))
6498            }
6499        };
6500
6501        let client = self.client.clone();
6502        cx.spawn(|this, cx| async move {
6503            let (buffers, incomplete_buffer_ids) = this.read_with(&cx, |this, cx| {
6504                let buffers = this
6505                    .opened_buffers
6506                    .iter()
6507                    .filter_map(|(id, buffer)| {
6508                        let buffer = buffer.upgrade(cx)?;
6509                        Some(proto::BufferVersion {
6510                            id: *id,
6511                            version: language::proto::serialize_version(&buffer.read(cx).version),
6512                        })
6513                    })
6514                    .collect();
6515                let incomplete_buffer_ids = this
6516                    .incomplete_remote_buffers
6517                    .keys()
6518                    .copied()
6519                    .collect::<Vec<_>>();
6520
6521                (buffers, incomplete_buffer_ids)
6522            });
6523            let response = client
6524                .request(proto::SynchronizeBuffers {
6525                    project_id,
6526                    buffers,
6527                })
6528                .await?;
6529
6530            let send_updates_for_buffers = response.buffers.into_iter().map(|buffer| {
6531                let client = client.clone();
6532                let buffer_id = buffer.id;
6533                let remote_version = language::proto::deserialize_version(&buffer.version);
6534                this.read_with(&cx, |this, cx| {
6535                    if let Some(buffer) = this.buffer_for_id(buffer_id, cx) {
6536                        let operations = buffer.read(cx).serialize_ops(Some(remote_version), cx);
6537                        cx.background().spawn(async move {
6538                            let operations = operations.await;
6539                            for chunk in split_operations(operations) {
6540                                client
6541                                    .request(proto::UpdateBuffer {
6542                                        project_id,
6543                                        buffer_id,
6544                                        operations: chunk,
6545                                    })
6546                                    .await?;
6547                            }
6548                            anyhow::Ok(())
6549                        })
6550                    } else {
6551                        Task::ready(Ok(()))
6552                    }
6553                })
6554            });
6555
6556            // Any incomplete buffers have open requests waiting. Request that the host sends
6557            // creates these buffers for us again to unblock any waiting futures.
6558            for id in incomplete_buffer_ids {
6559                cx.background()
6560                    .spawn(client.request(proto::OpenBufferById { project_id, id }))
6561                    .detach();
6562            }
6563
6564            futures::future::join_all(send_updates_for_buffers)
6565                .await
6566                .into_iter()
6567                .collect()
6568        })
6569    }
6570
6571    pub fn worktree_metadata_protos(&self, cx: &AppContext) -> Vec<proto::WorktreeMetadata> {
6572        self.worktrees(cx)
6573            .map(|worktree| {
6574                let worktree = worktree.read(cx);
6575                proto::WorktreeMetadata {
6576                    id: worktree.id().to_proto(),
6577                    root_name: worktree.root_name().into(),
6578                    visible: worktree.is_visible(),
6579                    abs_path: worktree.abs_path().to_string_lossy().into(),
6580                }
6581            })
6582            .collect()
6583    }
6584
6585    fn set_worktrees_from_proto(
6586        &mut self,
6587        worktrees: Vec<proto::WorktreeMetadata>,
6588        cx: &mut ModelContext<Project>,
6589    ) -> Result<()> {
6590        let replica_id = self.replica_id();
6591        let remote_id = self.remote_id().ok_or_else(|| anyhow!("invalid project"))?;
6592
6593        let mut old_worktrees_by_id = self
6594            .worktrees
6595            .drain(..)
6596            .filter_map(|worktree| {
6597                let worktree = worktree.upgrade(cx)?;
6598                Some((worktree.read(cx).id(), worktree))
6599            })
6600            .collect::<HashMap<_, _>>();
6601
6602        for worktree in worktrees {
6603            if let Some(old_worktree) =
6604                old_worktrees_by_id.remove(&WorktreeId::from_proto(worktree.id))
6605            {
6606                self.worktrees.push(WorktreeHandle::Strong(old_worktree));
6607            } else {
6608                let worktree =
6609                    Worktree::remote(remote_id, replica_id, worktree, self.client.clone(), cx);
6610                let _ = self.add_worktree(&worktree, cx);
6611            }
6612        }
6613
6614        self.metadata_changed(cx);
6615        for id in old_worktrees_by_id.keys() {
6616            cx.emit(Event::WorktreeRemoved(*id));
6617        }
6618
6619        Ok(())
6620    }
6621
6622    fn set_collaborators_from_proto(
6623        &mut self,
6624        messages: Vec<proto::Collaborator>,
6625        cx: &mut ModelContext<Self>,
6626    ) -> Result<()> {
6627        let mut collaborators = HashMap::default();
6628        for message in messages {
6629            let collaborator = Collaborator::from_proto(message)?;
6630            collaborators.insert(collaborator.peer_id, collaborator);
6631        }
6632        for old_peer_id in self.collaborators.keys() {
6633            if !collaborators.contains_key(old_peer_id) {
6634                cx.emit(Event::CollaboratorLeft(*old_peer_id));
6635            }
6636        }
6637        self.collaborators = collaborators;
6638        Ok(())
6639    }
6640
6641    fn deserialize_symbol(
6642        &self,
6643        serialized_symbol: proto::Symbol,
6644    ) -> impl Future<Output = Result<Symbol>> {
6645        let languages = self.languages.clone();
6646        async move {
6647            let source_worktree_id = WorktreeId::from_proto(serialized_symbol.source_worktree_id);
6648            let worktree_id = WorktreeId::from_proto(serialized_symbol.worktree_id);
6649            let start = serialized_symbol
6650                .start
6651                .ok_or_else(|| anyhow!("invalid start"))?;
6652            let end = serialized_symbol
6653                .end
6654                .ok_or_else(|| anyhow!("invalid end"))?;
6655            let kind = unsafe { mem::transmute(serialized_symbol.kind) };
6656            let path = ProjectPath {
6657                worktree_id,
6658                path: PathBuf::from(serialized_symbol.path).into(),
6659            };
6660            let language = languages
6661                .language_for_file(&path.path, None)
6662                .await
6663                .log_err();
6664            Ok(Symbol {
6665                language_server_name: LanguageServerName(
6666                    serialized_symbol.language_server_name.into(),
6667                ),
6668                source_worktree_id,
6669                path,
6670                label: {
6671                    match language {
6672                        Some(language) => {
6673                            language
6674                                .label_for_symbol(&serialized_symbol.name, kind)
6675                                .await
6676                        }
6677                        None => None,
6678                    }
6679                    .unwrap_or_else(|| CodeLabel::plain(serialized_symbol.name.clone(), None))
6680                },
6681
6682                name: serialized_symbol.name,
6683                range: Unclipped(PointUtf16::new(start.row, start.column))
6684                    ..Unclipped(PointUtf16::new(end.row, end.column)),
6685                kind,
6686                signature: serialized_symbol
6687                    .signature
6688                    .try_into()
6689                    .map_err(|_| anyhow!("invalid signature"))?,
6690            })
6691        }
6692    }
6693
6694    async fn handle_buffer_saved(
6695        this: ModelHandle<Self>,
6696        envelope: TypedEnvelope<proto::BufferSaved>,
6697        _: Arc<Client>,
6698        mut cx: AsyncAppContext,
6699    ) -> Result<()> {
6700        let fingerprint = deserialize_fingerprint(&envelope.payload.fingerprint)?;
6701        let version = deserialize_version(&envelope.payload.version);
6702        let mtime = envelope
6703            .payload
6704            .mtime
6705            .ok_or_else(|| anyhow!("missing mtime"))?
6706            .into();
6707
6708        this.update(&mut cx, |this, cx| {
6709            let buffer = this
6710                .opened_buffers
6711                .get(&envelope.payload.buffer_id)
6712                .and_then(|buffer| buffer.upgrade(cx))
6713                .or_else(|| {
6714                    this.incomplete_remote_buffers
6715                        .get(&envelope.payload.buffer_id)
6716                        .and_then(|b| b.clone())
6717                });
6718            if let Some(buffer) = buffer {
6719                buffer.update(cx, |buffer, cx| {
6720                    buffer.did_save(version, fingerprint, mtime, cx);
6721                });
6722            }
6723            Ok(())
6724        })
6725    }
6726
6727    async fn handle_buffer_reloaded(
6728        this: ModelHandle<Self>,
6729        envelope: TypedEnvelope<proto::BufferReloaded>,
6730        _: Arc<Client>,
6731        mut cx: AsyncAppContext,
6732    ) -> Result<()> {
6733        let payload = envelope.payload;
6734        let version = deserialize_version(&payload.version);
6735        let fingerprint = deserialize_fingerprint(&payload.fingerprint)?;
6736        let line_ending = deserialize_line_ending(
6737            proto::LineEnding::from_i32(payload.line_ending)
6738                .ok_or_else(|| anyhow!("missing line ending"))?,
6739        );
6740        let mtime = payload
6741            .mtime
6742            .ok_or_else(|| anyhow!("missing mtime"))?
6743            .into();
6744        this.update(&mut cx, |this, cx| {
6745            let buffer = this
6746                .opened_buffers
6747                .get(&payload.buffer_id)
6748                .and_then(|buffer| buffer.upgrade(cx))
6749                .or_else(|| {
6750                    this.incomplete_remote_buffers
6751                        .get(&payload.buffer_id)
6752                        .cloned()
6753                        .flatten()
6754                });
6755            if let Some(buffer) = buffer {
6756                buffer.update(cx, |buffer, cx| {
6757                    buffer.did_reload(version, fingerprint, line_ending, mtime, cx);
6758                });
6759            }
6760            Ok(())
6761        })
6762    }
6763
6764    #[allow(clippy::type_complexity)]
6765    fn edits_from_lsp(
6766        &mut self,
6767        buffer: &ModelHandle<Buffer>,
6768        lsp_edits: impl 'static + Send + IntoIterator<Item = lsp::TextEdit>,
6769        server_id: LanguageServerId,
6770        version: Option<i32>,
6771        cx: &mut ModelContext<Self>,
6772    ) -> Task<Result<Vec<(Range<Anchor>, String)>>> {
6773        let snapshot = self.buffer_snapshot_for_lsp_version(buffer, server_id, version, cx);
6774        cx.background().spawn(async move {
6775            let snapshot = snapshot?;
6776            let mut lsp_edits = lsp_edits
6777                .into_iter()
6778                .map(|edit| (range_from_lsp(edit.range), edit.new_text))
6779                .collect::<Vec<_>>();
6780            lsp_edits.sort_by_key(|(range, _)| range.start);
6781
6782            let mut lsp_edits = lsp_edits.into_iter().peekable();
6783            let mut edits = Vec::new();
6784            while let Some((range, mut new_text)) = lsp_edits.next() {
6785                // Clip invalid ranges provided by the language server.
6786                let mut range = snapshot.clip_point_utf16(range.start, Bias::Left)
6787                    ..snapshot.clip_point_utf16(range.end, Bias::Left);
6788
6789                // Combine any LSP edits that are adjacent.
6790                //
6791                // Also, combine LSP edits that are separated from each other by only
6792                // a newline. This is important because for some code actions,
6793                // Rust-analyzer rewrites the entire buffer via a series of edits that
6794                // are separated by unchanged newline characters.
6795                //
6796                // In order for the diffing logic below to work properly, any edits that
6797                // cancel each other out must be combined into one.
6798                while let Some((next_range, next_text)) = lsp_edits.peek() {
6799                    if next_range.start.0 > range.end {
6800                        if next_range.start.0.row > range.end.row + 1
6801                            || next_range.start.0.column > 0
6802                            || snapshot.clip_point_utf16(
6803                                Unclipped(PointUtf16::new(range.end.row, u32::MAX)),
6804                                Bias::Left,
6805                            ) > range.end
6806                        {
6807                            break;
6808                        }
6809                        new_text.push('\n');
6810                    }
6811                    range.end = snapshot.clip_point_utf16(next_range.end, Bias::Left);
6812                    new_text.push_str(next_text);
6813                    lsp_edits.next();
6814                }
6815
6816                // For multiline edits, perform a diff of the old and new text so that
6817                // we can identify the changes more precisely, preserving the locations
6818                // of any anchors positioned in the unchanged regions.
6819                if range.end.row > range.start.row {
6820                    let mut offset = range.start.to_offset(&snapshot);
6821                    let old_text = snapshot.text_for_range(range).collect::<String>();
6822
6823                    let diff = TextDiff::from_lines(old_text.as_str(), &new_text);
6824                    let mut moved_since_edit = true;
6825                    for change in diff.iter_all_changes() {
6826                        let tag = change.tag();
6827                        let value = change.value();
6828                        match tag {
6829                            ChangeTag::Equal => {
6830                                offset += value.len();
6831                                moved_since_edit = true;
6832                            }
6833                            ChangeTag::Delete => {
6834                                let start = snapshot.anchor_after(offset);
6835                                let end = snapshot.anchor_before(offset + value.len());
6836                                if moved_since_edit {
6837                                    edits.push((start..end, String::new()));
6838                                } else {
6839                                    edits.last_mut().unwrap().0.end = end;
6840                                }
6841                                offset += value.len();
6842                                moved_since_edit = false;
6843                            }
6844                            ChangeTag::Insert => {
6845                                if moved_since_edit {
6846                                    let anchor = snapshot.anchor_after(offset);
6847                                    edits.push((anchor..anchor, value.to_string()));
6848                                } else {
6849                                    edits.last_mut().unwrap().1.push_str(value);
6850                                }
6851                                moved_since_edit = false;
6852                            }
6853                        }
6854                    }
6855                } else if range.end == range.start {
6856                    let anchor = snapshot.anchor_after(range.start);
6857                    edits.push((anchor..anchor, new_text));
6858                } else {
6859                    let edit_start = snapshot.anchor_after(range.start);
6860                    let edit_end = snapshot.anchor_before(range.end);
6861                    edits.push((edit_start..edit_end, new_text));
6862                }
6863            }
6864
6865            Ok(edits)
6866        })
6867    }
6868
6869    fn buffer_snapshot_for_lsp_version(
6870        &mut self,
6871        buffer: &ModelHandle<Buffer>,
6872        server_id: LanguageServerId,
6873        version: Option<i32>,
6874        cx: &AppContext,
6875    ) -> Result<TextBufferSnapshot> {
6876        const OLD_VERSIONS_TO_RETAIN: i32 = 10;
6877
6878        if let Some(version) = version {
6879            let buffer_id = buffer.read(cx).remote_id();
6880            let snapshots = self
6881                .buffer_snapshots
6882                .get_mut(&buffer_id)
6883                .and_then(|m| m.get_mut(&server_id))
6884                .ok_or_else(|| {
6885                    anyhow!("no snapshots found for buffer {buffer_id} and server {server_id}")
6886                })?;
6887
6888            let found_snapshot = snapshots
6889                .binary_search_by_key(&version, |e| e.version)
6890                .map(|ix| snapshots[ix].snapshot.clone())
6891                .map_err(|_| {
6892                    anyhow!("snapshot not found for buffer {buffer_id} server {server_id} at version {version}")
6893                })?;
6894
6895            snapshots.retain(|snapshot| snapshot.version + OLD_VERSIONS_TO_RETAIN >= version);
6896            Ok(found_snapshot)
6897        } else {
6898            Ok((buffer.read(cx)).text_snapshot())
6899        }
6900    }
6901
6902    pub fn language_servers(
6903        &self,
6904    ) -> impl '_ + Iterator<Item = (LanguageServerId, LanguageServerName, WorktreeId)> {
6905        self.language_server_ids
6906            .iter()
6907            .map(|((worktree_id, server_name), server_id)| {
6908                (*server_id, server_name.clone(), *worktree_id)
6909            })
6910    }
6911
6912    pub fn language_server_for_id(&self, id: LanguageServerId) -> Option<Arc<LanguageServer>> {
6913        if let LanguageServerState::Running { server, .. } = self.language_servers.get(&id)? {
6914            Some(server.clone())
6915        } else {
6916            None
6917        }
6918    }
6919
6920    pub fn language_servers_for_buffer(
6921        &self,
6922        buffer: &Buffer,
6923        cx: &AppContext,
6924    ) -> impl Iterator<Item = (&Arc<CachedLspAdapter>, &Arc<LanguageServer>)> {
6925        self.language_server_ids_for_buffer(buffer, cx)
6926            .into_iter()
6927            .filter_map(|server_id| {
6928                let server = self.language_servers.get(&server_id)?;
6929                if let LanguageServerState::Running {
6930                    adapter, server, ..
6931                } = server
6932                {
6933                    Some((adapter, server))
6934                } else {
6935                    None
6936                }
6937            })
6938    }
6939
6940    fn primary_language_servers_for_buffer(
6941        &self,
6942        buffer: &Buffer,
6943        cx: &AppContext,
6944    ) -> Option<(&Arc<CachedLspAdapter>, &Arc<LanguageServer>)> {
6945        self.language_servers_for_buffer(buffer, cx).next()
6946    }
6947
6948    fn language_server_for_buffer(
6949        &self,
6950        buffer: &Buffer,
6951        server_id: LanguageServerId,
6952        cx: &AppContext,
6953    ) -> Option<(&Arc<CachedLspAdapter>, &Arc<LanguageServer>)> {
6954        self.language_servers_for_buffer(buffer, cx)
6955            .find(|(_, s)| s.server_id() == server_id)
6956    }
6957
6958    fn language_server_ids_for_buffer(
6959        &self,
6960        buffer: &Buffer,
6961        cx: &AppContext,
6962    ) -> Vec<LanguageServerId> {
6963        if let Some((file, language)) = File::from_dyn(buffer.file()).zip(buffer.language()) {
6964            let worktree_id = file.worktree_id(cx);
6965            language
6966                .lsp_adapters()
6967                .iter()
6968                .flat_map(|adapter| {
6969                    let key = (worktree_id, adapter.name.clone());
6970                    self.language_server_ids.get(&key).copied()
6971                })
6972                .collect()
6973        } else {
6974            Vec::new()
6975        }
6976    }
6977}
6978
6979impl WorktreeHandle {
6980    pub fn upgrade(&self, cx: &AppContext) -> Option<ModelHandle<Worktree>> {
6981        match self {
6982            WorktreeHandle::Strong(handle) => Some(handle.clone()),
6983            WorktreeHandle::Weak(handle) => handle.upgrade(cx),
6984        }
6985    }
6986
6987    pub fn handle_id(&self) -> usize {
6988        match self {
6989            WorktreeHandle::Strong(handle) => handle.id(),
6990            WorktreeHandle::Weak(handle) => handle.id(),
6991        }
6992    }
6993}
6994
6995impl OpenBuffer {
6996    pub fn upgrade(&self, cx: &impl BorrowAppContext) -> Option<ModelHandle<Buffer>> {
6997        match self {
6998            OpenBuffer::Strong(handle) => Some(handle.clone()),
6999            OpenBuffer::Weak(handle) => handle.upgrade(cx),
7000            OpenBuffer::Operations(_) => None,
7001        }
7002    }
7003}
7004
7005pub struct PathMatchCandidateSet {
7006    pub snapshot: Snapshot,
7007    pub include_ignored: bool,
7008    pub include_root_name: bool,
7009}
7010
7011impl<'a> fuzzy::PathMatchCandidateSet<'a> for PathMatchCandidateSet {
7012    type Candidates = PathMatchCandidateSetIter<'a>;
7013
7014    fn id(&self) -> usize {
7015        self.snapshot.id().to_usize()
7016    }
7017
7018    fn len(&self) -> usize {
7019        if self.include_ignored {
7020            self.snapshot.file_count()
7021        } else {
7022            self.snapshot.visible_file_count()
7023        }
7024    }
7025
7026    fn prefix(&self) -> Arc<str> {
7027        if self.snapshot.root_entry().map_or(false, |e| e.is_file()) {
7028            self.snapshot.root_name().into()
7029        } else if self.include_root_name {
7030            format!("{}/", self.snapshot.root_name()).into()
7031        } else {
7032            "".into()
7033        }
7034    }
7035
7036    fn candidates(&'a self, start: usize) -> Self::Candidates {
7037        PathMatchCandidateSetIter {
7038            traversal: self.snapshot.files(self.include_ignored, start),
7039        }
7040    }
7041}
7042
7043pub struct PathMatchCandidateSetIter<'a> {
7044    traversal: Traversal<'a>,
7045}
7046
7047impl<'a> Iterator for PathMatchCandidateSetIter<'a> {
7048    type Item = fuzzy::PathMatchCandidate<'a>;
7049
7050    fn next(&mut self) -> Option<Self::Item> {
7051        self.traversal.next().map(|entry| {
7052            if let EntryKind::File(char_bag) = entry.kind {
7053                fuzzy::PathMatchCandidate {
7054                    path: &entry.path,
7055                    char_bag,
7056                }
7057            } else {
7058                unreachable!()
7059            }
7060        })
7061    }
7062}
7063
7064impl Entity for Project {
7065    type Event = Event;
7066
7067    fn release(&mut self, cx: &mut gpui::AppContext) {
7068        match &self.client_state {
7069            Some(ProjectClientState::Local { .. }) => {
7070                let _ = self.unshare_internal(cx);
7071            }
7072            Some(ProjectClientState::Remote { remote_id, .. }) => {
7073                let _ = self.client.send(proto::LeaveProject {
7074                    project_id: *remote_id,
7075                });
7076                self.disconnected_from_host_internal(cx);
7077            }
7078            _ => {}
7079        }
7080    }
7081
7082    fn app_will_quit(
7083        &mut self,
7084        _: &mut AppContext,
7085    ) -> Option<std::pin::Pin<Box<dyn 'static + Future<Output = ()>>>> {
7086        let shutdown_futures = self
7087            .language_servers
7088            .drain()
7089            .map(|(_, server_state)| async {
7090                match server_state {
7091                    LanguageServerState::Running { server, .. } => server.shutdown()?.await,
7092                    LanguageServerState::Starting(starting_server) => {
7093                        starting_server.await?.shutdown()?.await
7094                    }
7095                }
7096            })
7097            .collect::<Vec<_>>();
7098
7099        Some(
7100            async move {
7101                futures::future::join_all(shutdown_futures).await;
7102            }
7103            .boxed(),
7104        )
7105    }
7106}
7107
7108impl Collaborator {
7109    fn from_proto(message: proto::Collaborator) -> Result<Self> {
7110        Ok(Self {
7111            peer_id: message.peer_id.ok_or_else(|| anyhow!("invalid peer id"))?,
7112            replica_id: message.replica_id as ReplicaId,
7113        })
7114    }
7115}
7116
7117impl<P: AsRef<Path>> From<(WorktreeId, P)> for ProjectPath {
7118    fn from((worktree_id, path): (WorktreeId, P)) -> Self {
7119        Self {
7120            worktree_id,
7121            path: path.as_ref().into(),
7122        }
7123    }
7124}
7125
7126fn split_operations(
7127    mut operations: Vec<proto::Operation>,
7128) -> impl Iterator<Item = Vec<proto::Operation>> {
7129    #[cfg(any(test, feature = "test-support"))]
7130    const CHUNK_SIZE: usize = 5;
7131
7132    #[cfg(not(any(test, feature = "test-support")))]
7133    const CHUNK_SIZE: usize = 100;
7134
7135    let mut done = false;
7136    std::iter::from_fn(move || {
7137        if done {
7138            return None;
7139        }
7140
7141        let operations = operations
7142            .drain(..cmp::min(CHUNK_SIZE, operations.len()))
7143            .collect::<Vec<_>>();
7144        if operations.is_empty() {
7145            done = true;
7146        }
7147        Some(operations)
7148    })
7149}
7150
7151fn serialize_symbol(symbol: &Symbol) -> proto::Symbol {
7152    proto::Symbol {
7153        language_server_name: symbol.language_server_name.0.to_string(),
7154        source_worktree_id: symbol.source_worktree_id.to_proto(),
7155        worktree_id: symbol.path.worktree_id.to_proto(),
7156        path: symbol.path.path.to_string_lossy().to_string(),
7157        name: symbol.name.clone(),
7158        kind: unsafe { mem::transmute(symbol.kind) },
7159        start: Some(proto::PointUtf16 {
7160            row: symbol.range.start.0.row,
7161            column: symbol.range.start.0.column,
7162        }),
7163        end: Some(proto::PointUtf16 {
7164            row: symbol.range.end.0.row,
7165            column: symbol.range.end.0.column,
7166        }),
7167        signature: symbol.signature.to_vec(),
7168    }
7169}
7170
7171fn relativize_path(base: &Path, path: &Path) -> PathBuf {
7172    let mut path_components = path.components();
7173    let mut base_components = base.components();
7174    let mut components: Vec<Component> = Vec::new();
7175    loop {
7176        match (path_components.next(), base_components.next()) {
7177            (None, None) => break,
7178            (Some(a), None) => {
7179                components.push(a);
7180                components.extend(path_components.by_ref());
7181                break;
7182            }
7183            (None, _) => components.push(Component::ParentDir),
7184            (Some(a), Some(b)) if components.is_empty() && a == b => (),
7185            (Some(a), Some(b)) if b == Component::CurDir => components.push(a),
7186            (Some(a), Some(_)) => {
7187                components.push(Component::ParentDir);
7188                for _ in base_components {
7189                    components.push(Component::ParentDir);
7190                }
7191                components.push(a);
7192                components.extend(path_components.by_ref());
7193                break;
7194            }
7195        }
7196    }
7197    components.iter().map(|c| c.as_os_str()).collect()
7198}
7199
7200impl Item for Buffer {
7201    fn entry_id(&self, cx: &AppContext) -> Option<ProjectEntryId> {
7202        File::from_dyn(self.file()).and_then(|file| file.project_entry_id(cx))
7203    }
7204
7205    fn project_path(&self, cx: &AppContext) -> Option<ProjectPath> {
7206        File::from_dyn(self.file()).map(|file| ProjectPath {
7207            worktree_id: file.worktree_id(cx),
7208            path: file.path().clone(),
7209        })
7210    }
7211}
7212
7213async fn wait_for_loading_buffer(
7214    mut receiver: postage::watch::Receiver<Option<Result<ModelHandle<Buffer>, Arc<anyhow::Error>>>>,
7215) -> Result<ModelHandle<Buffer>, Arc<anyhow::Error>> {
7216    loop {
7217        if let Some(result) = receiver.borrow().as_ref() {
7218            match result {
7219                Ok(buffer) => return Ok(buffer.to_owned()),
7220                Err(e) => return Err(e.to_owned()),
7221            }
7222        }
7223        receiver.next().await;
7224    }
7225}