1pub mod request;
   2use anyhow::{anyhow, Context as _, Result};
   3use async_compression::futures::bufread::GzipDecoder;
   4use async_tar::Archive;
   5use collections::{HashMap, HashSet};
   6use command_palette_hooks::CommandPaletteFilter;
   7use futures::{channel::oneshot, future::Shared, Future, FutureExt, TryFutureExt};
   8use gpui::{
   9    actions, AppContext, AsyncAppContext, Context, Entity, EntityId, EventEmitter, Global, Model,
  10    ModelContext, Task, WeakModel,
  11};
  12use language::{
  13    language_settings::{all_language_settings, language_settings},
  14    point_from_lsp, point_to_lsp, Anchor, Bias, Buffer, BufferSnapshot, Language,
  15    LanguageServerName, PointUtf16, ToPointUtf16,
  16};
  17use lsp::{LanguageServer, LanguageServerBinary, LanguageServerId};
  18use node_runtime::NodeRuntime;
  19use parking_lot::Mutex;
  20use request::StatusNotification;
  21use settings::SettingsStore;
  22use smol::{fs, io::BufReader, stream::StreamExt};
  23use std::{
  24    any::TypeId,
  25    ffi::OsString,
  26    mem,
  27    ops::Range,
  28    path::{Path, PathBuf},
  29    sync::Arc,
  30};
  31use util::{
  32    fs::remove_matching, github::latest_github_release, http::HttpClient, maybe, paths, ResultExt,
  33};
  34
  35actions!(
  36    copilot,
  37    [
  38        Suggest,
  39        NextSuggestion,
  40        PreviousSuggestion,
  41        Reinstall,
  42        SignIn,
  43        SignOut
  44    ]
  45);
  46
  47pub fn init(
  48    new_server_id: LanguageServerId,
  49    http: Arc<dyn HttpClient>,
  50    node_runtime: Arc<dyn NodeRuntime>,
  51    cx: &mut AppContext,
  52) {
  53    let copilot = cx.new_model({
  54        let node_runtime = node_runtime.clone();
  55        move |cx| Copilot::start(new_server_id, http, node_runtime, cx)
  56    });
  57    Copilot::set_global(copilot.clone(), cx);
  58    cx.observe(&copilot, |handle, cx| {
  59        let copilot_action_types = [
  60            TypeId::of::<Suggest>(),
  61            TypeId::of::<NextSuggestion>(),
  62            TypeId::of::<PreviousSuggestion>(),
  63            TypeId::of::<Reinstall>(),
  64        ];
  65        let copilot_auth_action_types = [TypeId::of::<SignOut>()];
  66        let copilot_no_auth_action_types = [TypeId::of::<SignIn>()];
  67        let status = handle.read(cx).status();
  68        let filter = CommandPaletteFilter::global_mut(cx);
  69
  70        match status {
  71            Status::Disabled => {
  72                filter.hide_action_types(&copilot_action_types);
  73                filter.hide_action_types(&copilot_auth_action_types);
  74                filter.hide_action_types(&copilot_no_auth_action_types);
  75            }
  76            Status::Authorized => {
  77                filter.hide_action_types(&copilot_no_auth_action_types);
  78                filter.show_action_types(
  79                    copilot_action_types
  80                        .iter()
  81                        .chain(&copilot_auth_action_types),
  82                );
  83            }
  84            _ => {
  85                filter.hide_action_types(&copilot_action_types);
  86                filter.hide_action_types(&copilot_auth_action_types);
  87                filter.show_action_types(copilot_no_auth_action_types.iter());
  88            }
  89        }
  90    })
  91    .detach();
  92
  93    cx.on_action(|_: &SignIn, cx| {
  94        if let Some(copilot) = Copilot::global(cx) {
  95            copilot
  96                .update(cx, |copilot, cx| copilot.sign_in(cx))
  97                .detach_and_log_err(cx);
  98        }
  99    });
 100    cx.on_action(|_: &SignOut, cx| {
 101        if let Some(copilot) = Copilot::global(cx) {
 102            copilot
 103                .update(cx, |copilot, cx| copilot.sign_out(cx))
 104                .detach_and_log_err(cx);
 105        }
 106    });
 107    cx.on_action(|_: &Reinstall, cx| {
 108        if let Some(copilot) = Copilot::global(cx) {
 109            copilot
 110                .update(cx, |copilot, cx| copilot.reinstall(cx))
 111                .detach();
 112        }
 113    });
 114}
 115
 116enum CopilotServer {
 117    Disabled,
 118    Starting { task: Shared<Task<()>> },
 119    Error(Arc<str>),
 120    Running(RunningCopilotServer),
 121}
 122
 123impl CopilotServer {
 124    fn as_authenticated(&mut self) -> Result<&mut RunningCopilotServer> {
 125        let server = self.as_running()?;
 126        if matches!(server.sign_in_status, SignInStatus::Authorized { .. }) {
 127            Ok(server)
 128        } else {
 129            Err(anyhow!("must sign in before using copilot"))
 130        }
 131    }
 132
 133    fn as_running(&mut self) -> Result<&mut RunningCopilotServer> {
 134        match self {
 135            CopilotServer::Starting { .. } => Err(anyhow!("copilot is still starting")),
 136            CopilotServer::Disabled => Err(anyhow!("copilot is disabled")),
 137            CopilotServer::Error(error) => Err(anyhow!(
 138                "copilot was not started because of an error: {}",
 139                error
 140            )),
 141            CopilotServer::Running(server) => Ok(server),
 142        }
 143    }
 144}
 145
 146struct RunningCopilotServer {
 147    name: LanguageServerName,
 148    lsp: Arc<LanguageServer>,
 149    sign_in_status: SignInStatus,
 150    registered_buffers: HashMap<EntityId, RegisteredBuffer>,
 151}
 152
 153#[derive(Clone, Debug)]
 154enum SignInStatus {
 155    Authorized,
 156    Unauthorized,
 157    SigningIn {
 158        prompt: Option<request::PromptUserDeviceFlow>,
 159        task: Shared<Task<Result<(), Arc<anyhow::Error>>>>,
 160    },
 161    SignedOut,
 162}
 163
 164#[derive(Debug, Clone)]
 165pub enum Status {
 166    Starting {
 167        task: Shared<Task<()>>,
 168    },
 169    Error(Arc<str>),
 170    Disabled,
 171    SignedOut,
 172    SigningIn {
 173        prompt: Option<request::PromptUserDeviceFlow>,
 174    },
 175    Unauthorized,
 176    Authorized,
 177}
 178
 179impl Status {
 180    pub fn is_authorized(&self) -> bool {
 181        matches!(self, Status::Authorized)
 182    }
 183}
 184
 185struct RegisteredBuffer {
 186    uri: lsp::Url,
 187    language_id: String,
 188    snapshot: BufferSnapshot,
 189    snapshot_version: i32,
 190    _subscriptions: [gpui::Subscription; 2],
 191    pending_buffer_change: Task<Option<()>>,
 192}
 193
 194impl RegisteredBuffer {
 195    fn report_changes(
 196        &mut self,
 197        buffer: &Model<Buffer>,
 198        cx: &mut ModelContext<Copilot>,
 199    ) -> oneshot::Receiver<(i32, BufferSnapshot)> {
 200        let (done_tx, done_rx) = oneshot::channel();
 201
 202        if buffer.read(cx).version() == self.snapshot.version {
 203            let _ = done_tx.send((self.snapshot_version, self.snapshot.clone()));
 204        } else {
 205            let buffer = buffer.downgrade();
 206            let id = buffer.entity_id();
 207            let prev_pending_change =
 208                mem::replace(&mut self.pending_buffer_change, Task::ready(None));
 209            self.pending_buffer_change = cx.spawn(move |copilot, mut cx| async move {
 210                prev_pending_change.await;
 211
 212                let old_version = copilot
 213                    .update(&mut cx, |copilot, _| {
 214                        let server = copilot.server.as_authenticated().log_err()?;
 215                        let buffer = server.registered_buffers.get_mut(&id)?;
 216                        Some(buffer.snapshot.version.clone())
 217                    })
 218                    .ok()??;
 219                let new_snapshot = buffer.update(&mut cx, |buffer, _| buffer.snapshot()).ok()?;
 220
 221                let content_changes = cx
 222                    .background_executor()
 223                    .spawn({
 224                        let new_snapshot = new_snapshot.clone();
 225                        async move {
 226                            new_snapshot
 227                                .edits_since::<(PointUtf16, usize)>(&old_version)
 228                                .map(|edit| {
 229                                    let edit_start = edit.new.start.0;
 230                                    let edit_end = edit_start + (edit.old.end.0 - edit.old.start.0);
 231                                    let new_text = new_snapshot
 232                                        .text_for_range(edit.new.start.1..edit.new.end.1)
 233                                        .collect();
 234                                    lsp::TextDocumentContentChangeEvent {
 235                                        range: Some(lsp::Range::new(
 236                                            point_to_lsp(edit_start),
 237                                            point_to_lsp(edit_end),
 238                                        )),
 239                                        range_length: None,
 240                                        text: new_text,
 241                                    }
 242                                })
 243                                .collect::<Vec<_>>()
 244                        }
 245                    })
 246                    .await;
 247
 248                copilot
 249                    .update(&mut cx, |copilot, _| {
 250                        let server = copilot.server.as_authenticated().log_err()?;
 251                        let buffer = server.registered_buffers.get_mut(&id)?;
 252                        if !content_changes.is_empty() {
 253                            buffer.snapshot_version += 1;
 254                            buffer.snapshot = new_snapshot;
 255                            server
 256                                .lsp
 257                                .notify::<lsp::notification::DidChangeTextDocument>(
 258                                    lsp::DidChangeTextDocumentParams {
 259                                        text_document: lsp::VersionedTextDocumentIdentifier::new(
 260                                            buffer.uri.clone(),
 261                                            buffer.snapshot_version,
 262                                        ),
 263                                        content_changes,
 264                                    },
 265                                )
 266                                .log_err();
 267                        }
 268                        let _ = done_tx.send((buffer.snapshot_version, buffer.snapshot.clone()));
 269                        Some(())
 270                    })
 271                    .ok()?;
 272
 273                Some(())
 274            });
 275        }
 276
 277        done_rx
 278    }
 279}
 280
 281#[derive(Debug)]
 282pub struct Completion {
 283    pub uuid: String,
 284    pub range: Range<Anchor>,
 285    pub text: String,
 286}
 287
 288pub struct Copilot {
 289    http: Arc<dyn HttpClient>,
 290    node_runtime: Arc<dyn NodeRuntime>,
 291    server: CopilotServer,
 292    buffers: HashSet<WeakModel<Buffer>>,
 293    server_id: LanguageServerId,
 294    _subscription: gpui::Subscription,
 295}
 296
 297pub enum Event {
 298    CopilotLanguageServerStarted,
 299}
 300
 301impl EventEmitter<Event> for Copilot {}
 302
 303struct GlobalCopilot(Model<Copilot>);
 304
 305impl Global for GlobalCopilot {}
 306
 307impl Copilot {
 308    pub fn global(cx: &AppContext) -> Option<Model<Self>> {
 309        cx.try_global::<GlobalCopilot>()
 310            .map(|model| model.0.clone())
 311    }
 312
 313    pub fn set_global(copilot: Model<Self>, cx: &mut AppContext) {
 314        cx.set_global(GlobalCopilot(copilot));
 315    }
 316
 317    fn start(
 318        new_server_id: LanguageServerId,
 319        http: Arc<dyn HttpClient>,
 320        node_runtime: Arc<dyn NodeRuntime>,
 321        cx: &mut ModelContext<Self>,
 322    ) -> Self {
 323        let mut this = Self {
 324            server_id: new_server_id,
 325            http,
 326            node_runtime,
 327            server: CopilotServer::Disabled,
 328            buffers: Default::default(),
 329            _subscription: cx.on_app_quit(Self::shutdown_language_server),
 330        };
 331        this.enable_or_disable_copilot(cx);
 332        cx.observe_global::<SettingsStore>(move |this, cx| this.enable_or_disable_copilot(cx))
 333            .detach();
 334        this
 335    }
 336
 337    fn shutdown_language_server(
 338        &mut self,
 339        _cx: &mut ModelContext<Self>,
 340    ) -> impl Future<Output = ()> {
 341        let shutdown = match mem::replace(&mut self.server, CopilotServer::Disabled) {
 342            CopilotServer::Running(server) => Some(Box::pin(async move { server.lsp.shutdown() })),
 343            _ => None,
 344        };
 345
 346        async move {
 347            if let Some(shutdown) = shutdown {
 348                shutdown.await;
 349            }
 350        }
 351    }
 352
 353    fn enable_or_disable_copilot(&mut self, cx: &mut ModelContext<Self>) {
 354        let server_id = self.server_id;
 355        let http = self.http.clone();
 356        let node_runtime = self.node_runtime.clone();
 357        if all_language_settings(None, cx).copilot_enabled(None, None) {
 358            if matches!(self.server, CopilotServer::Disabled) {
 359                let start_task = cx
 360                    .spawn(move |this, cx| {
 361                        Self::start_language_server(server_id, http, node_runtime, this, cx)
 362                    })
 363                    .shared();
 364                self.server = CopilotServer::Starting { task: start_task };
 365                cx.notify();
 366            }
 367        } else {
 368            self.server = CopilotServer::Disabled;
 369            cx.notify();
 370        }
 371    }
 372
 373    #[cfg(any(test, feature = "test-support"))]
 374    pub fn fake(cx: &mut gpui::TestAppContext) -> (Model<Self>, lsp::FakeLanguageServer) {
 375        use lsp::FakeLanguageServer;
 376        use node_runtime::FakeNodeRuntime;
 377
 378        let (server, fake_server) = FakeLanguageServer::new(
 379            LanguageServerId(0),
 380            LanguageServerBinary {
 381                path: "path/to/copilot".into(),
 382                arguments: vec![],
 383                env: None,
 384            },
 385            "copilot".into(),
 386            Default::default(),
 387            cx.to_async(),
 388        );
 389        let http = util::http::FakeHttpClient::create(|_| async { unreachable!() });
 390        let node_runtime = FakeNodeRuntime::new();
 391        let this = cx.new_model(|cx| Self {
 392            server_id: LanguageServerId(0),
 393            http: http.clone(),
 394            node_runtime,
 395            server: CopilotServer::Running(RunningCopilotServer {
 396                name: LanguageServerName(Arc::from("copilot")),
 397                lsp: Arc::new(server),
 398                sign_in_status: SignInStatus::Authorized,
 399                registered_buffers: Default::default(),
 400            }),
 401            _subscription: cx.on_app_quit(Self::shutdown_language_server),
 402            buffers: Default::default(),
 403        });
 404        (this, fake_server)
 405    }
 406
 407    fn start_language_server(
 408        new_server_id: LanguageServerId,
 409        http: Arc<dyn HttpClient>,
 410        node_runtime: Arc<dyn NodeRuntime>,
 411        this: WeakModel<Self>,
 412        mut cx: AsyncAppContext,
 413    ) -> impl Future<Output = ()> {
 414        async move {
 415            let start_language_server = async {
 416                let server_path = get_copilot_lsp(http).await?;
 417                let node_path = node_runtime.binary_path().await?;
 418                let arguments: Vec<OsString> = vec![server_path.into(), "--stdio".into()];
 419                let binary = LanguageServerBinary {
 420                    path: node_path,
 421                    arguments,
 422                    // TODO: We could set HTTP_PROXY etc here and fix the copilot issue.
 423                    env: None,
 424                };
 425
 426                let server = LanguageServer::new(
 427                    Arc::new(Mutex::new(None)),
 428                    new_server_id,
 429                    binary,
 430                    Path::new("/"),
 431                    None,
 432                    cx.clone(),
 433                )?;
 434
 435                server
 436                    .on_notification::<StatusNotification, _>(
 437                        |_, _| { /* Silence the notification */ },
 438                    )
 439                    .detach();
 440                let server = cx.update(|cx| server.initialize(None, cx))?.await?;
 441
 442                let status = server
 443                    .request::<request::CheckStatus>(request::CheckStatusParams {
 444                        local_checks_only: false,
 445                    })
 446                    .await?;
 447
 448                server
 449                    .request::<request::SetEditorInfo>(request::SetEditorInfoParams {
 450                        editor_info: request::EditorInfo {
 451                            name: "zed".into(),
 452                            version: env!("CARGO_PKG_VERSION").into(),
 453                        },
 454                        editor_plugin_info: request::EditorPluginInfo {
 455                            name: "zed-copilot".into(),
 456                            version: "0.0.1".into(),
 457                        },
 458                    })
 459                    .await?;
 460
 461                anyhow::Ok((server, status))
 462            };
 463
 464            let server = start_language_server.await;
 465            this.update(&mut cx, |this, cx| {
 466                cx.notify();
 467                match server {
 468                    Ok((server, status)) => {
 469                        this.server = CopilotServer::Running(RunningCopilotServer {
 470                            name: LanguageServerName(Arc::from("copilot")),
 471                            lsp: server,
 472                            sign_in_status: SignInStatus::SignedOut,
 473                            registered_buffers: Default::default(),
 474                        });
 475                        cx.emit(Event::CopilotLanguageServerStarted);
 476                        this.update_sign_in_status(status, cx);
 477                    }
 478                    Err(error) => {
 479                        this.server = CopilotServer::Error(error.to_string().into());
 480                        cx.notify()
 481                    }
 482                }
 483            })
 484            .ok();
 485        }
 486    }
 487
 488    pub fn sign_in(&mut self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
 489        if let CopilotServer::Running(server) = &mut self.server {
 490            let task = match &server.sign_in_status {
 491                SignInStatus::Authorized { .. } => Task::ready(Ok(())).shared(),
 492                SignInStatus::SigningIn { task, .. } => {
 493                    cx.notify();
 494                    task.clone()
 495                }
 496                SignInStatus::SignedOut | SignInStatus::Unauthorized { .. } => {
 497                    let lsp = server.lsp.clone();
 498                    let task = cx
 499                        .spawn(|this, mut cx| async move {
 500                            let sign_in = async {
 501                                let sign_in = lsp
 502                                    .request::<request::SignInInitiate>(
 503                                        request::SignInInitiateParams {},
 504                                    )
 505                                    .await?;
 506                                match sign_in {
 507                                    request::SignInInitiateResult::AlreadySignedIn { user } => {
 508                                        Ok(request::SignInStatus::Ok { user: Some(user) })
 509                                    }
 510                                    request::SignInInitiateResult::PromptUserDeviceFlow(flow) => {
 511                                        this.update(&mut cx, |this, cx| {
 512                                            if let CopilotServer::Running(RunningCopilotServer {
 513                                                sign_in_status: status,
 514                                                ..
 515                                            }) = &mut this.server
 516                                            {
 517                                                if let SignInStatus::SigningIn {
 518                                                    prompt: prompt_flow,
 519                                                    ..
 520                                                } = status
 521                                                {
 522                                                    *prompt_flow = Some(flow.clone());
 523                                                    cx.notify();
 524                                                }
 525                                            }
 526                                        })?;
 527                                        let response = lsp
 528                                            .request::<request::SignInConfirm>(
 529                                                request::SignInConfirmParams {
 530                                                    user_code: flow.user_code,
 531                                                },
 532                                            )
 533                                            .await?;
 534                                        Ok(response)
 535                                    }
 536                                }
 537                            };
 538
 539                            let sign_in = sign_in.await;
 540                            this.update(&mut cx, |this, cx| match sign_in {
 541                                Ok(status) => {
 542                                    this.update_sign_in_status(status, cx);
 543                                    Ok(())
 544                                }
 545                                Err(error) => {
 546                                    this.update_sign_in_status(
 547                                        request::SignInStatus::NotSignedIn,
 548                                        cx,
 549                                    );
 550                                    Err(Arc::new(error))
 551                                }
 552                            })?
 553                        })
 554                        .shared();
 555                    server.sign_in_status = SignInStatus::SigningIn {
 556                        prompt: None,
 557                        task: task.clone(),
 558                    };
 559                    cx.notify();
 560                    task
 561                }
 562            };
 563
 564            cx.background_executor()
 565                .spawn(task.map_err(|err| anyhow!("{:?}", err)))
 566        } else {
 567            // If we're downloading, wait until download is finished
 568            // If we're in a stuck state, display to the user
 569            Task::ready(Err(anyhow!("copilot hasn't started yet")))
 570        }
 571    }
 572
 573    fn sign_out(&mut self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
 574        self.update_sign_in_status(request::SignInStatus::NotSignedIn, cx);
 575        if let CopilotServer::Running(RunningCopilotServer { lsp: server, .. }) = &self.server {
 576            let server = server.clone();
 577            cx.background_executor().spawn(async move {
 578                server
 579                    .request::<request::SignOut>(request::SignOutParams {})
 580                    .await?;
 581                anyhow::Ok(())
 582            })
 583        } else {
 584            Task::ready(Err(anyhow!("copilot hasn't started yet")))
 585        }
 586    }
 587
 588    pub fn reinstall(&mut self, cx: &mut ModelContext<Self>) -> Task<()> {
 589        let start_task = cx
 590            .spawn({
 591                let http = self.http.clone();
 592                let node_runtime = self.node_runtime.clone();
 593                let server_id = self.server_id;
 594                move |this, cx| async move {
 595                    clear_copilot_dir().await;
 596                    Self::start_language_server(server_id, http, node_runtime, this, cx).await
 597                }
 598            })
 599            .shared();
 600
 601        self.server = CopilotServer::Starting {
 602            task: start_task.clone(),
 603        };
 604
 605        cx.notify();
 606
 607        cx.background_executor().spawn(start_task)
 608    }
 609
 610    pub fn language_server(&self) -> Option<(&LanguageServerName, &Arc<LanguageServer>)> {
 611        if let CopilotServer::Running(server) = &self.server {
 612            Some((&server.name, &server.lsp))
 613        } else {
 614            None
 615        }
 616    }
 617
 618    pub fn register_buffer(&mut self, buffer: &Model<Buffer>, cx: &mut ModelContext<Self>) {
 619        let weak_buffer = buffer.downgrade();
 620        self.buffers.insert(weak_buffer.clone());
 621
 622        if let CopilotServer::Running(RunningCopilotServer {
 623            lsp: server,
 624            sign_in_status: status,
 625            registered_buffers,
 626            ..
 627        }) = &mut self.server
 628        {
 629            if !matches!(status, SignInStatus::Authorized { .. }) {
 630                return;
 631            }
 632
 633            registered_buffers
 634                .entry(buffer.entity_id())
 635                .or_insert_with(|| {
 636                    let uri: lsp::Url = uri_for_buffer(buffer, cx);
 637                    let language_id = id_for_language(buffer.read(cx).language());
 638                    let snapshot = buffer.read(cx).snapshot();
 639                    server
 640                        .notify::<lsp::notification::DidOpenTextDocument>(
 641                            lsp::DidOpenTextDocumentParams {
 642                                text_document: lsp::TextDocumentItem {
 643                                    uri: uri.clone(),
 644                                    language_id: language_id.clone(),
 645                                    version: 0,
 646                                    text: snapshot.text(),
 647                                },
 648                            },
 649                        )
 650                        .log_err();
 651
 652                    RegisteredBuffer {
 653                        uri,
 654                        language_id,
 655                        snapshot,
 656                        snapshot_version: 0,
 657                        pending_buffer_change: Task::ready(Some(())),
 658                        _subscriptions: [
 659                            cx.subscribe(buffer, |this, buffer, event, cx| {
 660                                this.handle_buffer_event(buffer, event, cx).log_err();
 661                            }),
 662                            cx.observe_release(buffer, move |this, _buffer, _cx| {
 663                                this.buffers.remove(&weak_buffer);
 664                                this.unregister_buffer(&weak_buffer);
 665                            }),
 666                        ],
 667                    }
 668                });
 669        }
 670    }
 671
 672    fn handle_buffer_event(
 673        &mut self,
 674        buffer: Model<Buffer>,
 675        event: &language::Event,
 676        cx: &mut ModelContext<Self>,
 677    ) -> Result<()> {
 678        if let Ok(server) = self.server.as_running() {
 679            if let Some(registered_buffer) = server.registered_buffers.get_mut(&buffer.entity_id())
 680            {
 681                match event {
 682                    language::Event::Edited => {
 683                        let _ = registered_buffer.report_changes(&buffer, cx);
 684                    }
 685                    language::Event::Saved => {
 686                        server
 687                            .lsp
 688                            .notify::<lsp::notification::DidSaveTextDocument>(
 689                                lsp::DidSaveTextDocumentParams {
 690                                    text_document: lsp::TextDocumentIdentifier::new(
 691                                        registered_buffer.uri.clone(),
 692                                    ),
 693                                    text: None,
 694                                },
 695                            )?;
 696                    }
 697                    language::Event::FileHandleChanged | language::Event::LanguageChanged => {
 698                        let new_language_id = id_for_language(buffer.read(cx).language());
 699                        let new_uri = uri_for_buffer(&buffer, cx);
 700                        if new_uri != registered_buffer.uri
 701                            || new_language_id != registered_buffer.language_id
 702                        {
 703                            let old_uri = mem::replace(&mut registered_buffer.uri, new_uri);
 704                            registered_buffer.language_id = new_language_id;
 705                            server
 706                                .lsp
 707                                .notify::<lsp::notification::DidCloseTextDocument>(
 708                                    lsp::DidCloseTextDocumentParams {
 709                                        text_document: lsp::TextDocumentIdentifier::new(old_uri),
 710                                    },
 711                                )?;
 712                            server
 713                                .lsp
 714                                .notify::<lsp::notification::DidOpenTextDocument>(
 715                                    lsp::DidOpenTextDocumentParams {
 716                                        text_document: lsp::TextDocumentItem::new(
 717                                            registered_buffer.uri.clone(),
 718                                            registered_buffer.language_id.clone(),
 719                                            registered_buffer.snapshot_version,
 720                                            registered_buffer.snapshot.text(),
 721                                        ),
 722                                    },
 723                                )?;
 724                        }
 725                    }
 726                    _ => {}
 727                }
 728            }
 729        }
 730
 731        Ok(())
 732    }
 733
 734    fn unregister_buffer(&mut self, buffer: &WeakModel<Buffer>) {
 735        if let Ok(server) = self.server.as_running() {
 736            if let Some(buffer) = server.registered_buffers.remove(&buffer.entity_id()) {
 737                server
 738                    .lsp
 739                    .notify::<lsp::notification::DidCloseTextDocument>(
 740                        lsp::DidCloseTextDocumentParams {
 741                            text_document: lsp::TextDocumentIdentifier::new(buffer.uri),
 742                        },
 743                    )
 744                    .log_err();
 745            }
 746        }
 747    }
 748
 749    pub fn completions<T>(
 750        &mut self,
 751        buffer: &Model<Buffer>,
 752        position: T,
 753        cx: &mut ModelContext<Self>,
 754    ) -> Task<Result<Vec<Completion>>>
 755    where
 756        T: ToPointUtf16,
 757    {
 758        self.request_completions::<request::GetCompletions, _>(buffer, position, cx)
 759    }
 760
 761    pub fn completions_cycling<T>(
 762        &mut self,
 763        buffer: &Model<Buffer>,
 764        position: T,
 765        cx: &mut ModelContext<Self>,
 766    ) -> Task<Result<Vec<Completion>>>
 767    where
 768        T: ToPointUtf16,
 769    {
 770        self.request_completions::<request::GetCompletionsCycling, _>(buffer, position, cx)
 771    }
 772
 773    pub fn accept_completion(
 774        &mut self,
 775        completion: &Completion,
 776        cx: &mut ModelContext<Self>,
 777    ) -> Task<Result<()>> {
 778        let server = match self.server.as_authenticated() {
 779            Ok(server) => server,
 780            Err(error) => return Task::ready(Err(error)),
 781        };
 782        let request =
 783            server
 784                .lsp
 785                .request::<request::NotifyAccepted>(request::NotifyAcceptedParams {
 786                    uuid: completion.uuid.clone(),
 787                });
 788        cx.background_executor().spawn(async move {
 789            request.await?;
 790            Ok(())
 791        })
 792    }
 793
 794    pub fn discard_completions(
 795        &mut self,
 796        completions: &[Completion],
 797        cx: &mut ModelContext<Self>,
 798    ) -> Task<Result<()>> {
 799        let server = match self.server.as_authenticated() {
 800            Ok(server) => server,
 801            Err(_) => return Task::ready(Ok(())),
 802        };
 803        let request =
 804            server
 805                .lsp
 806                .request::<request::NotifyRejected>(request::NotifyRejectedParams {
 807                    uuids: completions
 808                        .iter()
 809                        .map(|completion| completion.uuid.clone())
 810                        .collect(),
 811                });
 812        cx.background_executor().spawn(async move {
 813            request.await?;
 814            Ok(())
 815        })
 816    }
 817
 818    fn request_completions<R, T>(
 819        &mut self,
 820        buffer: &Model<Buffer>,
 821        position: T,
 822        cx: &mut ModelContext<Self>,
 823    ) -> Task<Result<Vec<Completion>>>
 824    where
 825        R: 'static
 826            + lsp::request::Request<
 827                Params = request::GetCompletionsParams,
 828                Result = request::GetCompletionsResult,
 829            >,
 830        T: ToPointUtf16,
 831    {
 832        self.register_buffer(buffer, cx);
 833
 834        let server = match self.server.as_authenticated() {
 835            Ok(server) => server,
 836            Err(error) => return Task::ready(Err(error)),
 837        };
 838        let lsp = server.lsp.clone();
 839        let registered_buffer = server
 840            .registered_buffers
 841            .get_mut(&buffer.entity_id())
 842            .unwrap();
 843        let snapshot = registered_buffer.report_changes(buffer, cx);
 844        let buffer = buffer.read(cx);
 845        let uri = registered_buffer.uri.clone();
 846        let position = position.to_point_utf16(buffer);
 847        let settings = language_settings(buffer.language_at(position).as_ref(), buffer.file(), cx);
 848        let tab_size = settings.tab_size;
 849        let hard_tabs = settings.hard_tabs;
 850        let relative_path = buffer
 851            .file()
 852            .map(|file| file.path().to_path_buf())
 853            .unwrap_or_default();
 854
 855        cx.background_executor().spawn(async move {
 856            let (version, snapshot) = snapshot.await?;
 857            let result = lsp
 858                .request::<R>(request::GetCompletionsParams {
 859                    doc: request::GetCompletionsDocument {
 860                        uri,
 861                        tab_size: tab_size.into(),
 862                        indent_size: 1,
 863                        insert_spaces: !hard_tabs,
 864                        relative_path: relative_path.to_string_lossy().into(),
 865                        position: point_to_lsp(position),
 866                        version: version.try_into().unwrap(),
 867                    },
 868                })
 869                .await?;
 870            let completions = result
 871                .completions
 872                .into_iter()
 873                .map(|completion| {
 874                    let start = snapshot
 875                        .clip_point_utf16(point_from_lsp(completion.range.start), Bias::Left);
 876                    let end =
 877                        snapshot.clip_point_utf16(point_from_lsp(completion.range.end), Bias::Left);
 878                    Completion {
 879                        uuid: completion.uuid,
 880                        range: snapshot.anchor_before(start)..snapshot.anchor_after(end),
 881                        text: completion.text,
 882                    }
 883                })
 884                .collect();
 885            anyhow::Ok(completions)
 886        })
 887    }
 888
 889    pub fn status(&self) -> Status {
 890        match &self.server {
 891            CopilotServer::Starting { task } => Status::Starting { task: task.clone() },
 892            CopilotServer::Disabled => Status::Disabled,
 893            CopilotServer::Error(error) => Status::Error(error.clone()),
 894            CopilotServer::Running(RunningCopilotServer { sign_in_status, .. }) => {
 895                match sign_in_status {
 896                    SignInStatus::Authorized { .. } => Status::Authorized,
 897                    SignInStatus::Unauthorized { .. } => Status::Unauthorized,
 898                    SignInStatus::SigningIn { prompt, .. } => Status::SigningIn {
 899                        prompt: prompt.clone(),
 900                    },
 901                    SignInStatus::SignedOut => Status::SignedOut,
 902                }
 903            }
 904        }
 905    }
 906
 907    fn update_sign_in_status(
 908        &mut self,
 909        lsp_status: request::SignInStatus,
 910        cx: &mut ModelContext<Self>,
 911    ) {
 912        self.buffers.retain(|buffer| buffer.is_upgradable());
 913
 914        if let Ok(server) = self.server.as_running() {
 915            match lsp_status {
 916                request::SignInStatus::Ok { user: Some(_) }
 917                | request::SignInStatus::MaybeOk { .. }
 918                | request::SignInStatus::AlreadySignedIn { .. } => {
 919                    server.sign_in_status = SignInStatus::Authorized;
 920                    for buffer in self.buffers.iter().cloned().collect::<Vec<_>>() {
 921                        if let Some(buffer) = buffer.upgrade() {
 922                            self.register_buffer(&buffer, cx);
 923                        }
 924                    }
 925                }
 926                request::SignInStatus::NotAuthorized { .. } => {
 927                    server.sign_in_status = SignInStatus::Unauthorized;
 928                    for buffer in self.buffers.iter().cloned().collect::<Vec<_>>() {
 929                        self.unregister_buffer(&buffer);
 930                    }
 931                }
 932                request::SignInStatus::Ok { user: None } | request::SignInStatus::NotSignedIn => {
 933                    server.sign_in_status = SignInStatus::SignedOut;
 934                    for buffer in self.buffers.iter().cloned().collect::<Vec<_>>() {
 935                        self.unregister_buffer(&buffer);
 936                    }
 937                }
 938            }
 939
 940            cx.notify();
 941        }
 942    }
 943}
 944
 945fn id_for_language(language: Option<&Arc<Language>>) -> String {
 946    let language_name = language.map(|language| language.name());
 947    match language_name.as_deref() {
 948        Some("Plain Text") => "plaintext".to_string(),
 949        Some(language_name) => language_name.to_lowercase(),
 950        None => "plaintext".to_string(),
 951    }
 952}
 953
 954fn uri_for_buffer(buffer: &Model<Buffer>, cx: &AppContext) -> lsp::Url {
 955    if let Some(file) = buffer.read(cx).file().and_then(|file| file.as_local()) {
 956        lsp::Url::from_file_path(file.abs_path(cx)).unwrap()
 957    } else {
 958        format!("buffer://{}", buffer.entity_id()).parse().unwrap()
 959    }
 960}
 961
 962async fn clear_copilot_dir() {
 963    remove_matching(&paths::COPILOT_DIR, |_| true).await
 964}
 965
 966async fn get_copilot_lsp(http: Arc<dyn HttpClient>) -> anyhow::Result<PathBuf> {
 967    const SERVER_PATH: &str = "dist/agent.js";
 968
 969    ///Check for the latest copilot language server and download it if we haven't already
 970    async fn fetch_latest(http: Arc<dyn HttpClient>) -> anyhow::Result<PathBuf> {
 971        let release =
 972            latest_github_release("zed-industries/copilot", true, false, http.clone()).await?;
 973
 974        let version_dir = &*paths::COPILOT_DIR.join(format!("copilot-{}", release.tag_name));
 975
 976        fs::create_dir_all(version_dir).await?;
 977        let server_path = version_dir.join(SERVER_PATH);
 978
 979        if fs::metadata(&server_path).await.is_err() {
 980            // Copilot LSP looks for this dist dir specifically, so lets add it in.
 981            let dist_dir = version_dir.join("dist");
 982            fs::create_dir_all(dist_dir.as_path()).await?;
 983
 984            let url = &release
 985                .assets
 986                .get(0)
 987                .context("Github release for copilot contained no assets")?
 988                .browser_download_url;
 989
 990            let mut response = http
 991                .get(url, Default::default(), true)
 992                .await
 993                .context("error downloading copilot release")?;
 994            let decompressed_bytes = GzipDecoder::new(BufReader::new(response.body_mut()));
 995            let archive = Archive::new(decompressed_bytes);
 996            archive.unpack(dist_dir).await?;
 997
 998            remove_matching(&paths::COPILOT_DIR, |entry| entry != version_dir).await;
 999        }
1000
1001        Ok(server_path)
1002    }
1003
1004    match fetch_latest(http).await {
1005        ok @ Result::Ok(..) => ok,
1006        e @ Err(..) => {
1007            e.log_err();
1008            // Fetch a cached binary, if it exists
1009            maybe!(async {
1010                let mut last_version_dir = None;
1011                let mut entries = fs::read_dir(paths::COPILOT_DIR.as_path()).await?;
1012                while let Some(entry) = entries.next().await {
1013                    let entry = entry?;
1014                    if entry.file_type().await?.is_dir() {
1015                        last_version_dir = Some(entry.path());
1016                    }
1017                }
1018                let last_version_dir =
1019                    last_version_dir.ok_or_else(|| anyhow!("no cached binary"))?;
1020                let server_path = last_version_dir.join(SERVER_PATH);
1021                if server_path.exists() {
1022                    Ok(server_path)
1023                } else {
1024                    Err(anyhow!(
1025                        "missing executable in directory {:?}",
1026                        last_version_dir
1027                    ))
1028                }
1029            })
1030            .await
1031        }
1032    }
1033}
1034
1035#[cfg(test)]
1036mod tests {
1037    use super::*;
1038    use gpui::TestAppContext;
1039    use language::BufferId;
1040
1041    #[gpui::test(iterations = 10)]
1042    async fn test_buffer_management(cx: &mut TestAppContext) {
1043        let (copilot, mut lsp) = Copilot::fake(cx);
1044
1045        let buffer_1 = cx.new_model(|cx| Buffer::local("Hello", cx));
1046        let buffer_1_uri: lsp::Url = format!("buffer://{}", buffer_1.entity_id().as_u64())
1047            .parse()
1048            .unwrap();
1049        copilot.update(cx, |copilot, cx| copilot.register_buffer(&buffer_1, cx));
1050        assert_eq!(
1051            lsp.receive_notification::<lsp::notification::DidOpenTextDocument>()
1052                .await,
1053            lsp::DidOpenTextDocumentParams {
1054                text_document: lsp::TextDocumentItem::new(
1055                    buffer_1_uri.clone(),
1056                    "plaintext".into(),
1057                    0,
1058                    "Hello".into()
1059                ),
1060            }
1061        );
1062
1063        let buffer_2 = cx.new_model(|cx| Buffer::local("Goodbye", cx));
1064        let buffer_2_uri: lsp::Url = format!("buffer://{}", buffer_2.entity_id().as_u64())
1065            .parse()
1066            .unwrap();
1067        copilot.update(cx, |copilot, cx| copilot.register_buffer(&buffer_2, cx));
1068        assert_eq!(
1069            lsp.receive_notification::<lsp::notification::DidOpenTextDocument>()
1070                .await,
1071            lsp::DidOpenTextDocumentParams {
1072                text_document: lsp::TextDocumentItem::new(
1073                    buffer_2_uri.clone(),
1074                    "plaintext".into(),
1075                    0,
1076                    "Goodbye".into()
1077                ),
1078            }
1079        );
1080
1081        buffer_1.update(cx, |buffer, cx| buffer.edit([(5..5, " world")], None, cx));
1082        assert_eq!(
1083            lsp.receive_notification::<lsp::notification::DidChangeTextDocument>()
1084                .await,
1085            lsp::DidChangeTextDocumentParams {
1086                text_document: lsp::VersionedTextDocumentIdentifier::new(buffer_1_uri.clone(), 1),
1087                content_changes: vec![lsp::TextDocumentContentChangeEvent {
1088                    range: Some(lsp::Range::new(
1089                        lsp::Position::new(0, 5),
1090                        lsp::Position::new(0, 5)
1091                    )),
1092                    range_length: None,
1093                    text: " world".into(),
1094                }],
1095            }
1096        );
1097
1098        // Ensure updates to the file are reflected in the LSP.
1099        buffer_1.update(cx, |buffer, cx| {
1100            buffer.file_updated(
1101                Arc::new(File {
1102                    abs_path: "/root/child/buffer-1".into(),
1103                    path: Path::new("child/buffer-1").into(),
1104                }),
1105                cx,
1106            )
1107        });
1108        assert_eq!(
1109            lsp.receive_notification::<lsp::notification::DidCloseTextDocument>()
1110                .await,
1111            lsp::DidCloseTextDocumentParams {
1112                text_document: lsp::TextDocumentIdentifier::new(buffer_1_uri),
1113            }
1114        );
1115        let buffer_1_uri = lsp::Url::from_file_path("/root/child/buffer-1").unwrap();
1116        assert_eq!(
1117            lsp.receive_notification::<lsp::notification::DidOpenTextDocument>()
1118                .await,
1119            lsp::DidOpenTextDocumentParams {
1120                text_document: lsp::TextDocumentItem::new(
1121                    buffer_1_uri.clone(),
1122                    "plaintext".into(),
1123                    1,
1124                    "Hello world".into()
1125                ),
1126            }
1127        );
1128
1129        // Ensure all previously-registered buffers are closed when signing out.
1130        lsp.handle_request::<request::SignOut, _, _>(|_, _| async {
1131            Ok(request::SignOutResult {})
1132        });
1133        copilot
1134            .update(cx, |copilot, cx| copilot.sign_out(cx))
1135            .await
1136            .unwrap();
1137        assert_eq!(
1138            lsp.receive_notification::<lsp::notification::DidCloseTextDocument>()
1139                .await,
1140            lsp::DidCloseTextDocumentParams {
1141                text_document: lsp::TextDocumentIdentifier::new(buffer_1_uri.clone()),
1142            }
1143        );
1144        assert_eq!(
1145            lsp.receive_notification::<lsp::notification::DidCloseTextDocument>()
1146                .await,
1147            lsp::DidCloseTextDocumentParams {
1148                text_document: lsp::TextDocumentIdentifier::new(buffer_2_uri.clone()),
1149            }
1150        );
1151
1152        // Ensure all previously-registered buffers are re-opened when signing in.
1153        lsp.handle_request::<request::SignInInitiate, _, _>(|_, _| async {
1154            Ok(request::SignInInitiateResult::AlreadySignedIn {
1155                user: "user-1".into(),
1156            })
1157        });
1158        copilot
1159            .update(cx, |copilot, cx| copilot.sign_in(cx))
1160            .await
1161            .unwrap();
1162
1163        assert_eq!(
1164            lsp.receive_notification::<lsp::notification::DidOpenTextDocument>()
1165                .await,
1166            lsp::DidOpenTextDocumentParams {
1167                text_document: lsp::TextDocumentItem::new(
1168                    buffer_1_uri.clone(),
1169                    "plaintext".into(),
1170                    0,
1171                    "Hello world".into()
1172                ),
1173            }
1174        );
1175        assert_eq!(
1176            lsp.receive_notification::<lsp::notification::DidOpenTextDocument>()
1177                .await,
1178            lsp::DidOpenTextDocumentParams {
1179                text_document: lsp::TextDocumentItem::new(
1180                    buffer_2_uri.clone(),
1181                    "plaintext".into(),
1182                    0,
1183                    "Goodbye".into()
1184                ),
1185            }
1186        );
1187        // Dropping a buffer causes it to be closed on the LSP side as well.
1188        cx.update(|_| drop(buffer_2));
1189        assert_eq!(
1190            lsp.receive_notification::<lsp::notification::DidCloseTextDocument>()
1191                .await,
1192            lsp::DidCloseTextDocumentParams {
1193                text_document: lsp::TextDocumentIdentifier::new(buffer_2_uri),
1194            }
1195        );
1196    }
1197
1198    struct File {
1199        abs_path: PathBuf,
1200        path: Arc<Path>,
1201    }
1202
1203    impl language::File for File {
1204        fn as_local(&self) -> Option<&dyn language::LocalFile> {
1205            Some(self)
1206        }
1207
1208        fn mtime(&self) -> Option<std::time::SystemTime> {
1209            unimplemented!()
1210        }
1211
1212        fn path(&self) -> &Arc<Path> {
1213            &self.path
1214        }
1215
1216        fn full_path(&self, _: &AppContext) -> PathBuf {
1217            unimplemented!()
1218        }
1219
1220        fn file_name<'a>(&'a self, _: &'a AppContext) -> &'a std::ffi::OsStr {
1221            unimplemented!()
1222        }
1223
1224        fn is_deleted(&self) -> bool {
1225            unimplemented!()
1226        }
1227
1228        fn as_any(&self) -> &dyn std::any::Any {
1229            unimplemented!()
1230        }
1231
1232        fn to_proto(&self) -> rpc::proto::File {
1233            unimplemented!()
1234        }
1235
1236        fn worktree_id(&self) -> usize {
1237            0
1238        }
1239
1240        fn is_private(&self) -> bool {
1241            false
1242        }
1243    }
1244
1245    impl language::LocalFile for File {
1246        fn abs_path(&self, _: &AppContext) -> PathBuf {
1247            self.abs_path.clone()
1248        }
1249
1250        fn load(&self, _: &AppContext) -> Task<Result<String>> {
1251            unimplemented!()
1252        }
1253
1254        fn buffer_reloaded(
1255            &self,
1256            _: BufferId,
1257            _: &clock::Global,
1258            _: language::RopeFingerprint,
1259            _: language::LineEnding,
1260            _: Option<std::time::SystemTime>,
1261            _: &mut AppContext,
1262        ) {
1263            unimplemented!()
1264        }
1265    }
1266}