1mod connection;
   2mod diff;
   3mod mention;
   4mod terminal;
   5
   6pub use connection::*;
   7pub use diff::*;
   8pub use mention::*;
   9use serde::{Deserialize, Serialize};
  10pub use terminal::*;
  11
  12use action_log::ActionLog;
  13use agent_client_protocol as acp;
  14use anyhow::{Context as _, Result, anyhow};
  15use chrono::{DateTime, Utc};
  16use editor::Bias;
  17use futures::{FutureExt, channel::oneshot, future::BoxFuture};
  18use gpui::{AppContext, AsyncApp, Context, Entity, EventEmitter, SharedString, Task, WeakEntity};
  19use itertools::Itertools;
  20use language::{Anchor, Buffer, BufferSnapshot, LanguageRegistry, Point, ToPoint, text_diff};
  21use markdown::Markdown;
  22use project::{AgentLocation, Project, git_store::GitStoreCheckpoint};
  23use std::collections::HashMap;
  24use std::error::Error;
  25use std::fmt::{Formatter, Write};
  26use std::ops::Range;
  27use std::process::ExitStatus;
  28use std::rc::Rc;
  29use std::{fmt::Display, mem, path::PathBuf, sync::Arc};
  30use ui::App;
  31use util::ResultExt;
  32
  33#[derive(Debug)]
  34pub struct UserMessage {
  35    pub id: Option<UserMessageId>,
  36    pub content: ContentBlock,
  37    pub chunks: Vec<acp::ContentBlock>,
  38    pub checkpoint: Option<Checkpoint>,
  39}
  40
  41#[derive(Debug)]
  42pub struct Checkpoint {
  43    git_checkpoint: GitStoreCheckpoint,
  44    pub show: bool,
  45}
  46
  47impl UserMessage {
  48    fn to_markdown(&self, cx: &App) -> String {
  49        let mut markdown = String::new();
  50        if self
  51            .checkpoint
  52            .as_ref()
  53            .map_or(false, |checkpoint| checkpoint.show)
  54        {
  55            writeln!(markdown, "## User (checkpoint)").unwrap();
  56        } else {
  57            writeln!(markdown, "## User").unwrap();
  58        }
  59        writeln!(markdown).unwrap();
  60        writeln!(markdown, "{}", self.content.to_markdown(cx)).unwrap();
  61        writeln!(markdown).unwrap();
  62        markdown
  63    }
  64}
  65
  66#[derive(Debug, PartialEq)]
  67pub struct AssistantMessage {
  68    pub chunks: Vec<AssistantMessageChunk>,
  69}
  70
  71impl AssistantMessage {
  72    pub fn to_markdown(&self, cx: &App) -> String {
  73        format!(
  74            "## Assistant\n\n{}\n\n",
  75            self.chunks
  76                .iter()
  77                .map(|chunk| chunk.to_markdown(cx))
  78                .join("\n\n")
  79        )
  80    }
  81}
  82
  83#[derive(Debug, PartialEq)]
  84pub enum AssistantMessageChunk {
  85    Message { block: ContentBlock },
  86    Thought { block: ContentBlock },
  87}
  88
  89impl AssistantMessageChunk {
  90    pub fn from_str(chunk: &str, language_registry: &Arc<LanguageRegistry>, cx: &mut App) -> Self {
  91        Self::Message {
  92            block: ContentBlock::new(chunk.into(), language_registry, cx),
  93        }
  94    }
  95
  96    fn to_markdown(&self, cx: &App) -> String {
  97        match self {
  98            Self::Message { block } => block.to_markdown(cx).to_string(),
  99            Self::Thought { block } => {
 100                format!("<thinking>\n{}\n</thinking>", block.to_markdown(cx))
 101            }
 102        }
 103    }
 104}
 105
 106#[derive(Debug)]
 107pub enum AgentThreadEntry {
 108    UserMessage(UserMessage),
 109    AssistantMessage(AssistantMessage),
 110    ToolCall(ToolCall),
 111}
 112
 113impl AgentThreadEntry {
 114    pub fn to_markdown(&self, cx: &App) -> String {
 115        match self {
 116            Self::UserMessage(message) => message.to_markdown(cx),
 117            Self::AssistantMessage(message) => message.to_markdown(cx),
 118            Self::ToolCall(tool_call) => tool_call.to_markdown(cx),
 119        }
 120    }
 121
 122    pub fn user_message(&self) -> Option<&UserMessage> {
 123        if let AgentThreadEntry::UserMessage(message) = self {
 124            Some(message)
 125        } else {
 126            None
 127        }
 128    }
 129
 130    pub fn diffs(&self) -> impl Iterator<Item = &Entity<Diff>> {
 131        if let AgentThreadEntry::ToolCall(call) = self {
 132            itertools::Either::Left(call.diffs())
 133        } else {
 134            itertools::Either::Right(std::iter::empty())
 135        }
 136    }
 137
 138    pub fn terminals(&self) -> impl Iterator<Item = &Entity<Terminal>> {
 139        if let AgentThreadEntry::ToolCall(call) = self {
 140            itertools::Either::Left(call.terminals())
 141        } else {
 142            itertools::Either::Right(std::iter::empty())
 143        }
 144    }
 145
 146    pub fn location(&self, ix: usize) -> Option<(acp::ToolCallLocation, AgentLocation)> {
 147        if let AgentThreadEntry::ToolCall(ToolCall {
 148            locations,
 149            resolved_locations,
 150            ..
 151        }) = self
 152        {
 153            Some((
 154                locations.get(ix)?.clone(),
 155                resolved_locations.get(ix)?.clone()?,
 156            ))
 157        } else {
 158            None
 159        }
 160    }
 161}
 162
 163#[derive(Debug)]
 164pub struct ToolCall {
 165    pub id: acp::ToolCallId,
 166    pub label: Entity<Markdown>,
 167    pub kind: acp::ToolKind,
 168    pub content: Vec<ToolCallContent>,
 169    pub status: ToolCallStatus,
 170    pub locations: Vec<acp::ToolCallLocation>,
 171    pub resolved_locations: Vec<Option<AgentLocation>>,
 172    pub raw_input: Option<serde_json::Value>,
 173    pub raw_output: Option<serde_json::Value>,
 174}
 175
 176impl ToolCall {
 177    fn from_acp(
 178        tool_call: acp::ToolCall,
 179        status: ToolCallStatus,
 180        language_registry: Arc<LanguageRegistry>,
 181        cx: &mut App,
 182    ) -> Self {
 183        Self {
 184            id: tool_call.id,
 185            label: cx.new(|cx| {
 186                Markdown::new(
 187                    tool_call.title.into(),
 188                    Some(language_registry.clone()),
 189                    None,
 190                    cx,
 191                )
 192            }),
 193            kind: tool_call.kind,
 194            content: tool_call
 195                .content
 196                .into_iter()
 197                .map(|content| ToolCallContent::from_acp(content, language_registry.clone(), cx))
 198                .collect(),
 199            locations: tool_call.locations,
 200            resolved_locations: Vec::default(),
 201            status,
 202            raw_input: tool_call.raw_input,
 203            raw_output: tool_call.raw_output,
 204        }
 205    }
 206
 207    fn update_fields(
 208        &mut self,
 209        fields: acp::ToolCallUpdateFields,
 210        language_registry: Arc<LanguageRegistry>,
 211        cx: &mut App,
 212    ) {
 213        let acp::ToolCallUpdateFields {
 214            kind,
 215            status,
 216            title,
 217            content,
 218            locations,
 219            raw_input,
 220            raw_output,
 221        } = fields;
 222
 223        if let Some(kind) = kind {
 224            self.kind = kind;
 225        }
 226
 227        if let Some(status) = status {
 228            self.status = status.into();
 229        }
 230
 231        if let Some(title) = title {
 232            self.label.update(cx, |label, cx| {
 233                label.replace(title, cx);
 234            });
 235        }
 236
 237        if let Some(content) = content {
 238            self.content = content
 239                .into_iter()
 240                .map(|chunk| ToolCallContent::from_acp(chunk, language_registry.clone(), cx))
 241                .collect();
 242        }
 243
 244        if let Some(locations) = locations {
 245            self.locations = locations;
 246        }
 247
 248        if let Some(raw_input) = raw_input {
 249            self.raw_input = Some(raw_input);
 250        }
 251
 252        if let Some(raw_output) = raw_output {
 253            if self.content.is_empty() {
 254                if let Some(markdown) = markdown_for_raw_output(&raw_output, &language_registry, cx)
 255                {
 256                    self.content
 257                        .push(ToolCallContent::ContentBlock(ContentBlock::Markdown {
 258                            markdown,
 259                        }));
 260                }
 261            }
 262            self.raw_output = Some(raw_output);
 263        }
 264    }
 265
 266    pub fn diffs(&self) -> impl Iterator<Item = &Entity<Diff>> {
 267        self.content.iter().filter_map(|content| match content {
 268            ToolCallContent::Diff(diff) => Some(diff),
 269            ToolCallContent::ContentBlock(_) => None,
 270            ToolCallContent::Terminal(_) => None,
 271        })
 272    }
 273
 274    pub fn terminals(&self) -> impl Iterator<Item = &Entity<Terminal>> {
 275        self.content.iter().filter_map(|content| match content {
 276            ToolCallContent::Terminal(terminal) => Some(terminal),
 277            ToolCallContent::ContentBlock(_) => None,
 278            ToolCallContent::Diff(_) => None,
 279        })
 280    }
 281
 282    fn to_markdown(&self, cx: &App) -> String {
 283        let mut markdown = format!(
 284            "**Tool Call: {}**\nStatus: {}\n\n",
 285            self.label.read(cx).source(),
 286            self.status
 287        );
 288        for content in &self.content {
 289            markdown.push_str(content.to_markdown(cx).as_str());
 290            markdown.push_str("\n\n");
 291        }
 292        markdown
 293    }
 294
 295    async fn resolve_location(
 296        location: acp::ToolCallLocation,
 297        project: WeakEntity<Project>,
 298        cx: &mut AsyncApp,
 299    ) -> Option<AgentLocation> {
 300        let buffer = project
 301            .update(cx, |project, cx| {
 302                if let Some(path) = project.project_path_for_absolute_path(&location.path, cx) {
 303                    Some(project.open_buffer(path, cx))
 304                } else {
 305                    None
 306                }
 307            })
 308            .ok()??;
 309        let buffer = buffer.await.log_err()?;
 310        let position = buffer
 311            .update(cx, |buffer, _| {
 312                if let Some(row) = location.line {
 313                    let snapshot = buffer.snapshot();
 314                    let column = snapshot.indent_size_for_line(row).len;
 315                    let point = snapshot.clip_point(Point::new(row, column), Bias::Left);
 316                    snapshot.anchor_before(point)
 317                } else {
 318                    Anchor::MIN
 319                }
 320            })
 321            .ok()?;
 322
 323        Some(AgentLocation {
 324            buffer: buffer.downgrade(),
 325            position,
 326        })
 327    }
 328
 329    fn resolve_locations(
 330        &self,
 331        project: Entity<Project>,
 332        cx: &mut App,
 333    ) -> Task<Vec<Option<AgentLocation>>> {
 334        let locations = self.locations.clone();
 335        project.update(cx, |_, cx| {
 336            cx.spawn(async move |project, cx| {
 337                let mut new_locations = Vec::new();
 338                for location in locations {
 339                    new_locations.push(Self::resolve_location(location, project.clone(), cx).await);
 340                }
 341                new_locations
 342            })
 343        })
 344    }
 345}
 346
 347#[derive(Debug)]
 348pub enum ToolCallStatus {
 349    /// The tool call hasn't started running yet, but we start showing it to
 350    /// the user.
 351    Pending,
 352    /// The tool call is waiting for confirmation from the user.
 353    WaitingForConfirmation {
 354        options: Vec<acp::PermissionOption>,
 355        respond_tx: oneshot::Sender<acp::PermissionOptionId>,
 356    },
 357    /// The tool call is currently running.
 358    InProgress,
 359    /// The tool call completed successfully.
 360    Completed,
 361    /// The tool call failed.
 362    Failed,
 363    /// The user rejected the tool call.
 364    Rejected,
 365    /// The user canceled generation so the tool call was canceled.
 366    Canceled,
 367}
 368
 369impl From<acp::ToolCallStatus> for ToolCallStatus {
 370    fn from(status: acp::ToolCallStatus) -> Self {
 371        match status {
 372            acp::ToolCallStatus::Pending => Self::Pending,
 373            acp::ToolCallStatus::InProgress => Self::InProgress,
 374            acp::ToolCallStatus::Completed => Self::Completed,
 375            acp::ToolCallStatus::Failed => Self::Failed,
 376        }
 377    }
 378}
 379
 380impl Display for ToolCallStatus {
 381    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
 382        write!(
 383            f,
 384            "{}",
 385            match self {
 386                ToolCallStatus::Pending => "Pending",
 387                ToolCallStatus::WaitingForConfirmation { .. } => "Waiting for confirmation",
 388                ToolCallStatus::InProgress => "In Progress",
 389                ToolCallStatus::Completed => "Completed",
 390                ToolCallStatus::Failed => "Failed",
 391                ToolCallStatus::Rejected => "Rejected",
 392                ToolCallStatus::Canceled => "Canceled",
 393            }
 394        )
 395    }
 396}
 397
 398#[derive(Debug, PartialEq, Clone)]
 399pub enum ContentBlock {
 400    Empty,
 401    Markdown { markdown: Entity<Markdown> },
 402    ResourceLink { resource_link: acp::ResourceLink },
 403}
 404
 405impl ContentBlock {
 406    pub fn new(
 407        block: acp::ContentBlock,
 408        language_registry: &Arc<LanguageRegistry>,
 409        cx: &mut App,
 410    ) -> Self {
 411        let mut this = Self::Empty;
 412        this.append(block, language_registry, cx);
 413        this
 414    }
 415
 416    pub fn new_combined(
 417        blocks: impl IntoIterator<Item = acp::ContentBlock>,
 418        language_registry: Arc<LanguageRegistry>,
 419        cx: &mut App,
 420    ) -> Self {
 421        let mut this = Self::Empty;
 422        for block in blocks {
 423            this.append(block, &language_registry, cx);
 424        }
 425        this
 426    }
 427
 428    pub fn append(
 429        &mut self,
 430        block: acp::ContentBlock,
 431        language_registry: &Arc<LanguageRegistry>,
 432        cx: &mut App,
 433    ) {
 434        if matches!(self, ContentBlock::Empty) {
 435            if let acp::ContentBlock::ResourceLink(resource_link) = block {
 436                *self = ContentBlock::ResourceLink { resource_link };
 437                return;
 438            }
 439        }
 440
 441        let new_content = self.block_string_contents(block);
 442
 443        match self {
 444            ContentBlock::Empty => {
 445                *self = Self::create_markdown_block(new_content, language_registry, cx);
 446            }
 447            ContentBlock::Markdown { markdown } => {
 448                markdown.update(cx, |markdown, cx| markdown.append(&new_content, cx));
 449            }
 450            ContentBlock::ResourceLink { resource_link } => {
 451                let existing_content = Self::resource_link_md(&resource_link.uri);
 452                let combined = format!("{}\n{}", existing_content, new_content);
 453
 454                *self = Self::create_markdown_block(combined, language_registry, cx);
 455            }
 456        }
 457    }
 458
 459    fn create_markdown_block(
 460        content: String,
 461        language_registry: &Arc<LanguageRegistry>,
 462        cx: &mut App,
 463    ) -> ContentBlock {
 464        ContentBlock::Markdown {
 465            markdown: cx
 466                .new(|cx| Markdown::new(content.into(), Some(language_registry.clone()), None, cx)),
 467        }
 468    }
 469
 470    fn block_string_contents(&self, block: acp::ContentBlock) -> String {
 471        match block {
 472            acp::ContentBlock::Text(text_content) => text_content.text.clone(),
 473            acp::ContentBlock::ResourceLink(resource_link) => {
 474                Self::resource_link_md(&resource_link.uri)
 475            }
 476            acp::ContentBlock::Resource(acp::EmbeddedResource {
 477                resource:
 478                    acp::EmbeddedResourceResource::TextResourceContents(acp::TextResourceContents {
 479                        uri,
 480                        ..
 481                    }),
 482                ..
 483            }) => Self::resource_link_md(&uri),
 484            acp::ContentBlock::Image(image) => Self::image_md(&image),
 485            acp::ContentBlock::Audio(_) | acp::ContentBlock::Resource(_) => String::new(),
 486        }
 487    }
 488
 489    fn resource_link_md(uri: &str) -> String {
 490        if let Some(uri) = MentionUri::parse(&uri).log_err() {
 491            uri.as_link().to_string()
 492        } else {
 493            uri.to_string()
 494        }
 495    }
 496
 497    fn image_md(_image: &acp::ImageContent) -> String {
 498        "`Image`".into()
 499    }
 500
 501    fn to_markdown<'a>(&'a self, cx: &'a App) -> &'a str {
 502        match self {
 503            ContentBlock::Empty => "",
 504            ContentBlock::Markdown { markdown } => markdown.read(cx).source(),
 505            ContentBlock::ResourceLink { resource_link } => &resource_link.uri,
 506        }
 507    }
 508
 509    pub fn markdown(&self) -> Option<&Entity<Markdown>> {
 510        match self {
 511            ContentBlock::Empty => None,
 512            ContentBlock::Markdown { markdown } => Some(markdown),
 513            ContentBlock::ResourceLink { .. } => None,
 514        }
 515    }
 516
 517    pub fn resource_link(&self) -> Option<&acp::ResourceLink> {
 518        match self {
 519            ContentBlock::ResourceLink { resource_link } => Some(resource_link),
 520            _ => None,
 521        }
 522    }
 523}
 524
 525#[derive(Debug)]
 526pub enum ToolCallContent {
 527    ContentBlock(ContentBlock),
 528    Diff(Entity<Diff>),
 529    Terminal(Entity<Terminal>),
 530}
 531
 532impl ToolCallContent {
 533    pub fn from_acp(
 534        content: acp::ToolCallContent,
 535        language_registry: Arc<LanguageRegistry>,
 536        cx: &mut App,
 537    ) -> Self {
 538        match content {
 539            acp::ToolCallContent::Content { content } => {
 540                Self::ContentBlock(ContentBlock::new(content, &language_registry, cx))
 541            }
 542            acp::ToolCallContent::Diff { diff } => Self::Diff(cx.new(|cx| {
 543                Diff::finalized(
 544                    diff.path,
 545                    diff.old_text,
 546                    diff.new_text,
 547                    language_registry,
 548                    cx,
 549                )
 550            })),
 551        }
 552    }
 553
 554    pub fn to_markdown(&self, cx: &App) -> String {
 555        match self {
 556            Self::ContentBlock(content) => content.to_markdown(cx).to_string(),
 557            Self::Diff(diff) => diff.read(cx).to_markdown(cx),
 558            Self::Terminal(terminal) => terminal.read(cx).to_markdown(cx),
 559        }
 560    }
 561}
 562
 563#[derive(Debug, PartialEq)]
 564pub enum ToolCallUpdate {
 565    UpdateFields(acp::ToolCallUpdate),
 566    UpdateDiff(ToolCallUpdateDiff),
 567    UpdateTerminal(ToolCallUpdateTerminal),
 568}
 569
 570impl ToolCallUpdate {
 571    fn id(&self) -> &acp::ToolCallId {
 572        match self {
 573            Self::UpdateFields(update) => &update.id,
 574            Self::UpdateDiff(diff) => &diff.id,
 575            Self::UpdateTerminal(terminal) => &terminal.id,
 576        }
 577    }
 578}
 579
 580impl From<acp::ToolCallUpdate> for ToolCallUpdate {
 581    fn from(update: acp::ToolCallUpdate) -> Self {
 582        Self::UpdateFields(update)
 583    }
 584}
 585
 586impl From<ToolCallUpdateDiff> for ToolCallUpdate {
 587    fn from(diff: ToolCallUpdateDiff) -> Self {
 588        Self::UpdateDiff(diff)
 589    }
 590}
 591
 592#[derive(Debug, PartialEq)]
 593pub struct ToolCallUpdateDiff {
 594    pub id: acp::ToolCallId,
 595    pub diff: Entity<Diff>,
 596}
 597
 598impl From<ToolCallUpdateTerminal> for ToolCallUpdate {
 599    fn from(terminal: ToolCallUpdateTerminal) -> Self {
 600        Self::UpdateTerminal(terminal)
 601    }
 602}
 603
 604#[derive(Debug, PartialEq)]
 605pub struct ToolCallUpdateTerminal {
 606    pub id: acp::ToolCallId,
 607    pub terminal: Entity<Terminal>,
 608}
 609
 610#[derive(Debug, Default)]
 611pub struct Plan {
 612    pub entries: Vec<PlanEntry>,
 613}
 614
 615#[derive(Debug)]
 616pub struct PlanStats<'a> {
 617    pub in_progress_entry: Option<&'a PlanEntry>,
 618    pub pending: u32,
 619    pub completed: u32,
 620}
 621
 622impl Plan {
 623    pub fn is_empty(&self) -> bool {
 624        self.entries.is_empty()
 625    }
 626
 627    pub fn stats(&self) -> PlanStats<'_> {
 628        let mut stats = PlanStats {
 629            in_progress_entry: None,
 630            pending: 0,
 631            completed: 0,
 632        };
 633
 634        for entry in &self.entries {
 635            match &entry.status {
 636                acp::PlanEntryStatus::Pending => {
 637                    stats.pending += 1;
 638                }
 639                acp::PlanEntryStatus::InProgress => {
 640                    stats.in_progress_entry = stats.in_progress_entry.or(Some(entry));
 641                }
 642                acp::PlanEntryStatus::Completed => {
 643                    stats.completed += 1;
 644                }
 645            }
 646        }
 647
 648        stats
 649    }
 650}
 651
 652#[derive(Debug)]
 653pub struct PlanEntry {
 654    pub content: Entity<Markdown>,
 655    pub priority: acp::PlanEntryPriority,
 656    pub status: acp::PlanEntryStatus,
 657}
 658
 659impl PlanEntry {
 660    pub fn from_acp(entry: acp::PlanEntry, cx: &mut App) -> Self {
 661        Self {
 662            content: cx.new(|cx| Markdown::new(entry.content.into(), None, None, cx)),
 663            priority: entry.priority,
 664            status: entry.status,
 665        }
 666    }
 667}
 668
 669#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, Hash)]
 670pub struct AgentServerName(pub SharedString);
 671
 672#[derive(Debug, Clone, Serialize, Deserialize)]
 673pub struct AcpThreadMetadata {
 674    pub agent: AgentServerName,
 675    pub id: acp::SessionId,
 676    pub title: SharedString,
 677    pub updated_at: DateTime<Utc>,
 678}
 679
 680pub struct AcpThread {
 681    title: SharedString,
 682    entries: Vec<AgentThreadEntry>,
 683    plan: Plan,
 684    project: Entity<Project>,
 685    action_log: Entity<ActionLog>,
 686    shared_buffers: HashMap<Entity<Buffer>, BufferSnapshot>,
 687    send_task: Option<Task<()>>,
 688    connection: Rc<dyn AgentConnection>,
 689    session_id: acp::SessionId,
 690}
 691
 692pub enum AcpThreadEvent {
 693    NewEntry,
 694    EntryUpdated(usize),
 695    EntriesRemoved(Range<usize>),
 696    ToolAuthorizationRequired,
 697    Stopped,
 698    Error,
 699    ServerExited(ExitStatus),
 700}
 701
 702impl EventEmitter<AcpThreadEvent> for AcpThread {}
 703
 704#[derive(PartialEq, Eq)]
 705pub enum ThreadStatus {
 706    Idle,
 707    WaitingForToolConfirmation,
 708    Generating,
 709}
 710
 711#[derive(Debug, Clone)]
 712pub enum LoadError {
 713    Unsupported {
 714        error_message: SharedString,
 715        upgrade_message: SharedString,
 716        upgrade_command: String,
 717    },
 718    Exited(i32),
 719    Other(SharedString),
 720}
 721
 722impl Display for LoadError {
 723    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
 724        match self {
 725            LoadError::Unsupported { error_message, .. } => write!(f, "{}", error_message),
 726            LoadError::Exited(status) => write!(f, "Server exited with status {}", status),
 727            LoadError::Other(msg) => write!(f, "{}", msg),
 728        }
 729    }
 730}
 731
 732impl Error for LoadError {}
 733
 734impl AcpThread {
 735    pub fn new(
 736        title: impl Into<SharedString>,
 737        connection: Rc<dyn AgentConnection>,
 738        project: Entity<Project>,
 739        session_id: acp::SessionId,
 740        cx: &mut Context<Self>,
 741    ) -> Self {
 742        let action_log = cx.new(|_| ActionLog::new(project.clone()));
 743
 744        Self {
 745            action_log,
 746            shared_buffers: Default::default(),
 747            entries: Default::default(),
 748            plan: Default::default(),
 749            title: title.into(),
 750            project,
 751            send_task: None,
 752            connection,
 753            session_id,
 754        }
 755    }
 756
 757    pub fn connection(&self) -> &Rc<dyn AgentConnection> {
 758        &self.connection
 759    }
 760
 761    pub fn action_log(&self) -> &Entity<ActionLog> {
 762        &self.action_log
 763    }
 764
 765    pub fn project(&self) -> &Entity<Project> {
 766        &self.project
 767    }
 768
 769    pub fn title(&self) -> SharedString {
 770        self.title.clone()
 771    }
 772
 773    pub fn entries(&self) -> &[AgentThreadEntry] {
 774        &self.entries
 775    }
 776
 777    pub fn session_id(&self) -> &acp::SessionId {
 778        &self.session_id
 779    }
 780
 781    pub fn status(&self) -> ThreadStatus {
 782        if self.send_task.is_some() {
 783            if self.waiting_for_tool_confirmation() {
 784                ThreadStatus::WaitingForToolConfirmation
 785            } else {
 786                ThreadStatus::Generating
 787            }
 788        } else {
 789            ThreadStatus::Idle
 790        }
 791    }
 792
 793    pub fn has_pending_edit_tool_calls(&self) -> bool {
 794        for entry in self.entries.iter().rev() {
 795            match entry {
 796                AgentThreadEntry::UserMessage(_) => return false,
 797                AgentThreadEntry::ToolCall(
 798                    call @ ToolCall {
 799                        status: ToolCallStatus::InProgress | ToolCallStatus::Pending,
 800                        ..
 801                    },
 802                ) if call.diffs().next().is_some() => {
 803                    return true;
 804                }
 805                AgentThreadEntry::ToolCall(_) | AgentThreadEntry::AssistantMessage(_) => {}
 806            }
 807        }
 808
 809        false
 810    }
 811
 812    pub fn used_tools_since_last_user_message(&self) -> bool {
 813        for entry in self.entries.iter().rev() {
 814            match entry {
 815                AgentThreadEntry::UserMessage(..) => return false,
 816                AgentThreadEntry::AssistantMessage(..) => continue,
 817                AgentThreadEntry::ToolCall(..) => return true,
 818            }
 819        }
 820
 821        false
 822    }
 823
 824    pub fn handle_session_update(
 825        &mut self,
 826        update: acp::SessionUpdate,
 827        cx: &mut Context<Self>,
 828    ) -> Result<(), acp::Error> {
 829        match update {
 830            acp::SessionUpdate::UserMessageChunk { content } => {
 831                self.push_user_content_block(None, content, cx);
 832            }
 833            acp::SessionUpdate::AgentMessageChunk { content } => {
 834                self.push_assistant_content_block(content, false, cx);
 835            }
 836            acp::SessionUpdate::AgentThoughtChunk { content } => {
 837                self.push_assistant_content_block(content, true, cx);
 838            }
 839            acp::SessionUpdate::ToolCall(tool_call) => {
 840                self.upsert_tool_call(tool_call, cx)?;
 841            }
 842            acp::SessionUpdate::ToolCallUpdate(tool_call_update) => {
 843                self.update_tool_call(tool_call_update, cx)?;
 844            }
 845            acp::SessionUpdate::Plan(plan) => {
 846                self.update_plan(plan, cx);
 847            }
 848        }
 849        Ok(())
 850    }
 851
 852    pub fn push_user_content_block(
 853        &mut self,
 854        message_id: Option<UserMessageId>,
 855        chunk: acp::ContentBlock,
 856        cx: &mut Context<Self>,
 857    ) {
 858        let language_registry = self.project.read(cx).languages().clone();
 859        let entries_len = self.entries.len();
 860
 861        if let Some(last_entry) = self.entries.last_mut()
 862            && let AgentThreadEntry::UserMessage(UserMessage {
 863                id,
 864                content,
 865                chunks,
 866                ..
 867            }) = last_entry
 868        {
 869            *id = message_id.or(id.take());
 870            content.append(chunk.clone(), &language_registry, cx);
 871            chunks.push(chunk);
 872            let idx = entries_len - 1;
 873            cx.emit(AcpThreadEvent::EntryUpdated(idx));
 874        } else {
 875            let content = ContentBlock::new(chunk.clone(), &language_registry, cx);
 876            self.push_entry(
 877                AgentThreadEntry::UserMessage(UserMessage {
 878                    id: message_id,
 879                    content,
 880                    chunks: vec![chunk],
 881                    checkpoint: None,
 882                }),
 883                cx,
 884            );
 885        }
 886    }
 887
 888    pub fn push_assistant_content_block(
 889        &mut self,
 890        chunk: acp::ContentBlock,
 891        is_thought: bool,
 892        cx: &mut Context<Self>,
 893    ) {
 894        let language_registry = self.project.read(cx).languages().clone();
 895        let entries_len = self.entries.len();
 896        if let Some(last_entry) = self.entries.last_mut()
 897            && let AgentThreadEntry::AssistantMessage(AssistantMessage { chunks }) = last_entry
 898        {
 899            let idx = entries_len - 1;
 900            cx.emit(AcpThreadEvent::EntryUpdated(idx));
 901            match (chunks.last_mut(), is_thought) {
 902                (Some(AssistantMessageChunk::Message { block }), false)
 903                | (Some(AssistantMessageChunk::Thought { block }), true) => {
 904                    block.append(chunk, &language_registry, cx)
 905                }
 906                _ => {
 907                    let block = ContentBlock::new(chunk, &language_registry, cx);
 908                    if is_thought {
 909                        chunks.push(AssistantMessageChunk::Thought { block })
 910                    } else {
 911                        chunks.push(AssistantMessageChunk::Message { block })
 912                    }
 913                }
 914            }
 915        } else {
 916            let block = ContentBlock::new(chunk, &language_registry, cx);
 917            let chunk = if is_thought {
 918                AssistantMessageChunk::Thought { block }
 919            } else {
 920                AssistantMessageChunk::Message { block }
 921            };
 922
 923            self.push_entry(
 924                AgentThreadEntry::AssistantMessage(AssistantMessage {
 925                    chunks: vec![chunk],
 926                }),
 927                cx,
 928            );
 929        }
 930    }
 931
 932    fn push_entry(&mut self, entry: AgentThreadEntry, cx: &mut Context<Self>) {
 933        self.entries.push(entry);
 934        cx.emit(AcpThreadEvent::NewEntry);
 935    }
 936
 937    pub fn update_tool_call(
 938        &mut self,
 939        update: impl Into<ToolCallUpdate>,
 940        cx: &mut Context<Self>,
 941    ) -> Result<()> {
 942        let update = update.into();
 943        let languages = self.project.read(cx).languages().clone();
 944
 945        let (ix, current_call) = self
 946            .tool_call_mut(update.id())
 947            .context("Tool call not found")?;
 948        match update {
 949            ToolCallUpdate::UpdateFields(update) => {
 950                let location_updated = update.fields.locations.is_some();
 951                current_call.update_fields(update.fields, languages, cx);
 952                if location_updated {
 953                    self.resolve_locations(update.id.clone(), cx);
 954                }
 955            }
 956            ToolCallUpdate::UpdateDiff(update) => {
 957                current_call.content.clear();
 958                current_call
 959                    .content
 960                    .push(ToolCallContent::Diff(update.diff));
 961            }
 962            ToolCallUpdate::UpdateTerminal(update) => {
 963                current_call.content.clear();
 964                current_call
 965                    .content
 966                    .push(ToolCallContent::Terminal(update.terminal));
 967            }
 968        }
 969
 970        cx.emit(AcpThreadEvent::EntryUpdated(ix));
 971
 972        Ok(())
 973    }
 974
 975    /// Updates a tool call if id matches an existing entry, otherwise inserts a new one.
 976    pub fn upsert_tool_call(
 977        &mut self,
 978        tool_call: acp::ToolCall,
 979        cx: &mut Context<Self>,
 980    ) -> Result<(), acp::Error> {
 981        let status = tool_call.status.into();
 982        self.upsert_tool_call_inner(tool_call.into(), status, cx)
 983    }
 984
 985    /// Fails if id does not match an existing entry.
 986    pub fn upsert_tool_call_inner(
 987        &mut self,
 988        tool_call_update: acp::ToolCallUpdate,
 989        status: ToolCallStatus,
 990        cx: &mut Context<Self>,
 991    ) -> Result<(), acp::Error> {
 992        let language_registry = self.project.read(cx).languages().clone();
 993        let id = tool_call_update.id.clone();
 994
 995        if let Some((ix, current_call)) = self.tool_call_mut(&id) {
 996            current_call.update_fields(tool_call_update.fields, language_registry, cx);
 997            current_call.status = status;
 998
 999            cx.emit(AcpThreadEvent::EntryUpdated(ix));
1000        } else {
1001            let call =
1002                ToolCall::from_acp(tool_call_update.try_into()?, status, language_registry, cx);
1003            self.push_entry(AgentThreadEntry::ToolCall(call), cx);
1004        };
1005
1006        self.resolve_locations(id, cx);
1007        Ok(())
1008    }
1009
1010    fn tool_call_mut(&mut self, id: &acp::ToolCallId) -> Option<(usize, &mut ToolCall)> {
1011        // The tool call we are looking for is typically the last one, or very close to the end.
1012        // At the moment, it doesn't seem like a hashmap would be a good fit for this use case.
1013        self.entries
1014            .iter_mut()
1015            .enumerate()
1016            .rev()
1017            .find_map(|(index, tool_call)| {
1018                if let AgentThreadEntry::ToolCall(tool_call) = tool_call
1019                    && &tool_call.id == id
1020                {
1021                    Some((index, tool_call))
1022                } else {
1023                    None
1024                }
1025            })
1026    }
1027
1028    pub fn resolve_locations(&mut self, id: acp::ToolCallId, cx: &mut Context<Self>) {
1029        let project = self.project.clone();
1030        let Some((_, tool_call)) = self.tool_call_mut(&id) else {
1031            return;
1032        };
1033        let task = tool_call.resolve_locations(project, cx);
1034        cx.spawn(async move |this, cx| {
1035            let resolved_locations = task.await;
1036            this.update(cx, |this, cx| {
1037                let project = this.project.clone();
1038                let Some((ix, tool_call)) = this.tool_call_mut(&id) else {
1039                    return;
1040                };
1041                if let Some(Some(location)) = resolved_locations.last() {
1042                    project.update(cx, |project, cx| {
1043                        if let Some(agent_location) = project.agent_location() {
1044                            let should_ignore = agent_location.buffer == location.buffer
1045                                && location
1046                                    .buffer
1047                                    .update(cx, |buffer, _| {
1048                                        let snapshot = buffer.snapshot();
1049                                        let old_position =
1050                                            agent_location.position.to_point(&snapshot);
1051                                        let new_position = location.position.to_point(&snapshot);
1052                                        // ignore this so that when we get updates from the edit tool
1053                                        // the position doesn't reset to the startof line
1054                                        old_position.row == new_position.row
1055                                            && old_position.column > new_position.column
1056                                    })
1057                                    .ok()
1058                                    .unwrap_or_default();
1059                            if !should_ignore {
1060                                project.set_agent_location(Some(location.clone()), cx);
1061                            }
1062                        }
1063                    });
1064                }
1065                if tool_call.resolved_locations != resolved_locations {
1066                    tool_call.resolved_locations = resolved_locations;
1067                    cx.emit(AcpThreadEvent::EntryUpdated(ix));
1068                }
1069            })
1070        })
1071        .detach();
1072    }
1073
1074    pub fn request_tool_call_authorization(
1075        &mut self,
1076        tool_call: acp::ToolCallUpdate,
1077        options: Vec<acp::PermissionOption>,
1078        cx: &mut Context<Self>,
1079    ) -> Result<oneshot::Receiver<acp::PermissionOptionId>, acp::Error> {
1080        let (tx, rx) = oneshot::channel();
1081
1082        let status = ToolCallStatus::WaitingForConfirmation {
1083            options,
1084            respond_tx: tx,
1085        };
1086
1087        self.upsert_tool_call_inner(tool_call, status, cx)?;
1088        cx.emit(AcpThreadEvent::ToolAuthorizationRequired);
1089        Ok(rx)
1090    }
1091
1092    pub fn authorize_tool_call(
1093        &mut self,
1094        id: acp::ToolCallId,
1095        option_id: acp::PermissionOptionId,
1096        option_kind: acp::PermissionOptionKind,
1097        cx: &mut Context<Self>,
1098    ) {
1099        let Some((ix, call)) = self.tool_call_mut(&id) else {
1100            return;
1101        };
1102
1103        let new_status = match option_kind {
1104            acp::PermissionOptionKind::RejectOnce | acp::PermissionOptionKind::RejectAlways => {
1105                ToolCallStatus::Rejected
1106            }
1107            acp::PermissionOptionKind::AllowOnce | acp::PermissionOptionKind::AllowAlways => {
1108                ToolCallStatus::InProgress
1109            }
1110        };
1111
1112        let curr_status = mem::replace(&mut call.status, new_status);
1113
1114        if let ToolCallStatus::WaitingForConfirmation { respond_tx, .. } = curr_status {
1115            respond_tx.send(option_id).log_err();
1116        } else if cfg!(debug_assertions) {
1117            panic!("tried to authorize an already authorized tool call");
1118        }
1119
1120        cx.emit(AcpThreadEvent::EntryUpdated(ix));
1121    }
1122
1123    /// Returns true if the last turn is awaiting tool authorization
1124    pub fn waiting_for_tool_confirmation(&self) -> bool {
1125        for entry in self.entries.iter().rev() {
1126            match &entry {
1127                AgentThreadEntry::ToolCall(call) => match call.status {
1128                    ToolCallStatus::WaitingForConfirmation { .. } => return true,
1129                    ToolCallStatus::Pending
1130                    | ToolCallStatus::InProgress
1131                    | ToolCallStatus::Completed
1132                    | ToolCallStatus::Failed
1133                    | ToolCallStatus::Rejected
1134                    | ToolCallStatus::Canceled => continue,
1135                },
1136                AgentThreadEntry::UserMessage(_) | AgentThreadEntry::AssistantMessage(_) => {
1137                    // Reached the beginning of the turn
1138                    return false;
1139                }
1140            }
1141        }
1142        false
1143    }
1144
1145    pub fn plan(&self) -> &Plan {
1146        &self.plan
1147    }
1148
1149    pub fn update_plan(&mut self, request: acp::Plan, cx: &mut Context<Self>) {
1150        let new_entries_len = request.entries.len();
1151        let mut new_entries = request.entries.into_iter();
1152
1153        // Reuse existing markdown to prevent flickering
1154        for (old, new) in self.plan.entries.iter_mut().zip(new_entries.by_ref()) {
1155            let PlanEntry {
1156                content,
1157                priority,
1158                status,
1159            } = old;
1160            content.update(cx, |old, cx| {
1161                old.replace(new.content, cx);
1162            });
1163            *priority = new.priority;
1164            *status = new.status;
1165        }
1166        for new in new_entries {
1167            self.plan.entries.push(PlanEntry::from_acp(new, cx))
1168        }
1169        self.plan.entries.truncate(new_entries_len);
1170
1171        cx.notify();
1172    }
1173
1174    fn clear_completed_plan_entries(&mut self, cx: &mut Context<Self>) {
1175        self.plan
1176            .entries
1177            .retain(|entry| !matches!(entry.status, acp::PlanEntryStatus::Completed));
1178        cx.notify();
1179    }
1180
1181    #[cfg(any(test, feature = "test-support"))]
1182    pub fn send_raw(
1183        &mut self,
1184        message: &str,
1185        cx: &mut Context<Self>,
1186    ) -> BoxFuture<'static, Result<()>> {
1187        self.send(
1188            vec![acp::ContentBlock::Text(acp::TextContent {
1189                text: message.to_string(),
1190                annotations: None,
1191            })],
1192            cx,
1193        )
1194    }
1195
1196    pub fn send(
1197        &mut self,
1198        message: Vec<acp::ContentBlock>,
1199        cx: &mut Context<Self>,
1200    ) -> BoxFuture<'static, Result<()>> {
1201        let block = ContentBlock::new_combined(
1202            message.clone(),
1203            self.project.read(cx).languages().clone(),
1204            cx,
1205        );
1206        let request = acp::PromptRequest {
1207            prompt: message.clone(),
1208            session_id: self.session_id.clone(),
1209        };
1210        let git_store = self.project.read(cx).git_store().clone();
1211
1212        let message_id = if self
1213            .connection
1214            .session_editor(&self.session_id, cx)
1215            .is_some()
1216        {
1217            Some(UserMessageId::new())
1218        } else {
1219            None
1220        };
1221        self.push_entry(
1222            AgentThreadEntry::UserMessage(UserMessage {
1223                id: message_id.clone(),
1224                content: block,
1225                chunks: message,
1226                checkpoint: None,
1227            }),
1228            cx,
1229        );
1230
1231        self.run_turn(cx, async move |this, cx| {
1232            let old_checkpoint = git_store
1233                .update(cx, |git, cx| git.checkpoint(cx))?
1234                .await
1235                .context("failed to get old checkpoint")
1236                .log_err();
1237            this.update(cx, |this, cx| {
1238                if let Some((_ix, message)) = this.last_user_message() {
1239                    message.checkpoint = old_checkpoint.map(|git_checkpoint| Checkpoint {
1240                        git_checkpoint,
1241                        show: false,
1242                    });
1243                }
1244                this.connection.prompt(message_id, request, cx)
1245            })?
1246            .await
1247        })
1248    }
1249
1250    pub fn resume(&mut self, cx: &mut Context<Self>) -> BoxFuture<'static, Result<()>> {
1251        self.run_turn(cx, async move |this, cx| {
1252            this.update(cx, |this, cx| {
1253                this.connection
1254                    .resume(&this.session_id, cx)
1255                    .map(|resume| resume.run(cx))
1256            })?
1257            .context("resuming a session is not supported")?
1258            .await
1259        })
1260    }
1261
1262    fn run_turn(
1263        &mut self,
1264        cx: &mut Context<Self>,
1265        f: impl 'static + AsyncFnOnce(WeakEntity<Self>, &mut AsyncApp) -> Result<acp::PromptResponse>,
1266    ) -> BoxFuture<'static, Result<()>> {
1267        self.clear_completed_plan_entries(cx);
1268
1269        let (tx, rx) = oneshot::channel();
1270        let cancel_task = self.cancel(cx);
1271
1272        self.send_task = Some(cx.spawn(async move |this, cx| {
1273            cancel_task.await;
1274            tx.send(f(this, cx).await).ok();
1275        }));
1276
1277        cx.spawn(async move |this, cx| {
1278            let response = rx.await;
1279
1280            this.update(cx, |this, cx| this.update_last_checkpoint(cx))?
1281                .await?;
1282
1283            this.update(cx, |this, cx| {
1284                match response {
1285                    Ok(Err(e)) => {
1286                        this.send_task.take();
1287                        cx.emit(AcpThreadEvent::Error);
1288                        Err(e)
1289                    }
1290                    result => {
1291                        let canceled = matches!(
1292                            result,
1293                            Ok(Ok(acp::PromptResponse {
1294                                stop_reason: acp::StopReason::Canceled
1295                            }))
1296                        );
1297
1298                        // We only take the task if the current prompt wasn't canceled.
1299                        //
1300                        // This prompt may have been canceled because another one was sent
1301                        // while it was still generating. In these cases, dropping `send_task`
1302                        // would cause the next generation to be canceled.
1303                        if !canceled {
1304                            this.send_task.take();
1305                        }
1306
1307                        cx.emit(AcpThreadEvent::Stopped);
1308                        Ok(())
1309                    }
1310                }
1311            })?
1312        })
1313        .boxed()
1314    }
1315
1316    pub fn cancel(&mut self, cx: &mut Context<Self>) -> Task<()> {
1317        let Some(send_task) = self.send_task.take() else {
1318            return Task::ready(());
1319        };
1320
1321        for entry in self.entries.iter_mut() {
1322            if let AgentThreadEntry::ToolCall(call) = entry {
1323                let cancel = matches!(
1324                    call.status,
1325                    ToolCallStatus::Pending
1326                        | ToolCallStatus::WaitingForConfirmation { .. }
1327                        | ToolCallStatus::InProgress
1328                );
1329
1330                if cancel {
1331                    call.status = ToolCallStatus::Canceled;
1332                }
1333            }
1334        }
1335
1336        self.connection.cancel(&self.session_id, cx);
1337
1338        // Wait for the send task to complete
1339        cx.foreground_executor().spawn(send_task)
1340    }
1341
1342    /// Rewinds this thread to before the entry at `index`, removing it and all
1343    /// subsequent entries while reverting any changes made from that point.
1344    pub fn rewind(&mut self, id: UserMessageId, cx: &mut Context<Self>) -> Task<Result<()>> {
1345        let Some(session_editor) = self.connection.session_editor(&self.session_id, cx) else {
1346            return Task::ready(Err(anyhow!("not supported")));
1347        };
1348        let Some(message) = self.user_message(&id) else {
1349            return Task::ready(Err(anyhow!("message not found")));
1350        };
1351
1352        let checkpoint = message
1353            .checkpoint
1354            .as_ref()
1355            .map(|c| c.git_checkpoint.clone());
1356
1357        let git_store = self.project.read(cx).git_store().clone();
1358        cx.spawn(async move |this, cx| {
1359            if let Some(checkpoint) = checkpoint {
1360                git_store
1361                    .update(cx, |git, cx| git.restore_checkpoint(checkpoint, cx))?
1362                    .await?;
1363            }
1364
1365            cx.update(|cx| session_editor.truncate(id.clone(), cx))?
1366                .await?;
1367            this.update(cx, |this, cx| {
1368                if let Some((ix, _)) = this.user_message_mut(&id) {
1369                    let range = ix..this.entries.len();
1370                    this.entries.truncate(ix);
1371                    cx.emit(AcpThreadEvent::EntriesRemoved(range));
1372                }
1373            })
1374        })
1375    }
1376
1377    fn update_last_checkpoint(&mut self, cx: &mut Context<Self>) -> Task<Result<()>> {
1378        let git_store = self.project.read(cx).git_store().clone();
1379
1380        let old_checkpoint = if let Some((_, message)) = self.last_user_message() {
1381            if let Some(checkpoint) = message.checkpoint.as_ref() {
1382                checkpoint.git_checkpoint.clone()
1383            } else {
1384                return Task::ready(Ok(()));
1385            }
1386        } else {
1387            return Task::ready(Ok(()));
1388        };
1389
1390        let new_checkpoint = git_store.update(cx, |git, cx| git.checkpoint(cx));
1391        cx.spawn(async move |this, cx| {
1392            let new_checkpoint = new_checkpoint
1393                .await
1394                .context("failed to get new checkpoint")
1395                .log_err();
1396            if let Some(new_checkpoint) = new_checkpoint {
1397                let equal = git_store
1398                    .update(cx, |git, cx| {
1399                        git.compare_checkpoints(old_checkpoint.clone(), new_checkpoint, cx)
1400                    })?
1401                    .await
1402                    .unwrap_or(true);
1403                this.update(cx, |this, cx| {
1404                    let (ix, message) = this.last_user_message().context("no user message")?;
1405                    let checkpoint = message.checkpoint.as_mut().context("no checkpoint")?;
1406                    checkpoint.show = !equal;
1407                    cx.emit(AcpThreadEvent::EntryUpdated(ix));
1408                    anyhow::Ok(())
1409                })??;
1410            }
1411
1412            Ok(())
1413        })
1414    }
1415
1416    fn last_user_message(&mut self) -> Option<(usize, &mut UserMessage)> {
1417        self.entries
1418            .iter_mut()
1419            .enumerate()
1420            .rev()
1421            .find_map(|(ix, entry)| {
1422                if let AgentThreadEntry::UserMessage(message) = entry {
1423                    Some((ix, message))
1424                } else {
1425                    None
1426                }
1427            })
1428    }
1429
1430    fn user_message(&self, id: &UserMessageId) -> Option<&UserMessage> {
1431        self.entries.iter().find_map(|entry| {
1432            if let AgentThreadEntry::UserMessage(message) = entry {
1433                if message.id.as_ref() == Some(&id) {
1434                    Some(message)
1435                } else {
1436                    None
1437                }
1438            } else {
1439                None
1440            }
1441        })
1442    }
1443
1444    fn user_message_mut(&mut self, id: &UserMessageId) -> Option<(usize, &mut UserMessage)> {
1445        self.entries.iter_mut().enumerate().find_map(|(ix, entry)| {
1446            if let AgentThreadEntry::UserMessage(message) = entry {
1447                if message.id.as_ref() == Some(&id) {
1448                    Some((ix, message))
1449                } else {
1450                    None
1451                }
1452            } else {
1453                None
1454            }
1455        })
1456    }
1457
1458    pub fn read_text_file(
1459        &self,
1460        path: PathBuf,
1461        line: Option<u32>,
1462        limit: Option<u32>,
1463        reuse_shared_snapshot: bool,
1464        cx: &mut Context<Self>,
1465    ) -> Task<Result<String>> {
1466        let project = self.project.clone();
1467        let action_log = self.action_log.clone();
1468        cx.spawn(async move |this, cx| {
1469            let load = project.update(cx, |project, cx| {
1470                let path = project
1471                    .project_path_for_absolute_path(&path, cx)
1472                    .context("invalid path")?;
1473                anyhow::Ok(project.open_buffer(path, cx))
1474            });
1475            let buffer = load??.await?;
1476
1477            let snapshot = if reuse_shared_snapshot {
1478                this.read_with(cx, |this, _| {
1479                    this.shared_buffers.get(&buffer.clone()).cloned()
1480                })
1481                .log_err()
1482                .flatten()
1483            } else {
1484                None
1485            };
1486
1487            let snapshot = if let Some(snapshot) = snapshot {
1488                snapshot
1489            } else {
1490                action_log.update(cx, |action_log, cx| {
1491                    action_log.buffer_read(buffer.clone(), cx);
1492                })?;
1493                project.update(cx, |project, cx| {
1494                    let position = buffer
1495                        .read(cx)
1496                        .snapshot()
1497                        .anchor_before(Point::new(line.unwrap_or_default(), 0));
1498                    project.set_agent_location(
1499                        Some(AgentLocation {
1500                            buffer: buffer.downgrade(),
1501                            position,
1502                        }),
1503                        cx,
1504                    );
1505                })?;
1506
1507                buffer.update(cx, |buffer, _| buffer.snapshot())?
1508            };
1509
1510            this.update(cx, |this, _| {
1511                let text = snapshot.text();
1512                this.shared_buffers.insert(buffer.clone(), snapshot);
1513                if line.is_none() && limit.is_none() {
1514                    return Ok(text);
1515                }
1516                let limit = limit.unwrap_or(u32::MAX) as usize;
1517                let Some(line) = line else {
1518                    return Ok(text.lines().take(limit).collect::<String>());
1519                };
1520
1521                let count = text.lines().count();
1522                if count < line as usize {
1523                    anyhow::bail!("There are only {} lines", count);
1524                }
1525                Ok(text
1526                    .lines()
1527                    .skip(line as usize + 1)
1528                    .take(limit)
1529                    .collect::<String>())
1530            })?
1531        })
1532    }
1533
1534    pub fn write_text_file(
1535        &self,
1536        path: PathBuf,
1537        content: String,
1538        cx: &mut Context<Self>,
1539    ) -> Task<Result<()>> {
1540        let project = self.project.clone();
1541        let action_log = self.action_log.clone();
1542        cx.spawn(async move |this, cx| {
1543            let load = project.update(cx, |project, cx| {
1544                let path = project
1545                    .project_path_for_absolute_path(&path, cx)
1546                    .context("invalid path")?;
1547                anyhow::Ok(project.open_buffer(path, cx))
1548            });
1549            let buffer = load??.await?;
1550            let snapshot = this.update(cx, |this, cx| {
1551                this.shared_buffers
1552                    .get(&buffer)
1553                    .cloned()
1554                    .unwrap_or_else(|| buffer.read(cx).snapshot())
1555            })?;
1556            let edits = cx
1557                .background_executor()
1558                .spawn(async move {
1559                    let old_text = snapshot.text();
1560                    text_diff(old_text.as_str(), &content)
1561                        .into_iter()
1562                        .map(|(range, replacement)| {
1563                            (
1564                                snapshot.anchor_after(range.start)
1565                                    ..snapshot.anchor_before(range.end),
1566                                replacement,
1567                            )
1568                        })
1569                        .collect::<Vec<_>>()
1570                })
1571                .await;
1572            cx.update(|cx| {
1573                project.update(cx, |project, cx| {
1574                    project.set_agent_location(
1575                        Some(AgentLocation {
1576                            buffer: buffer.downgrade(),
1577                            position: edits
1578                                .last()
1579                                .map(|(range, _)| range.end)
1580                                .unwrap_or(Anchor::MIN),
1581                        }),
1582                        cx,
1583                    );
1584                });
1585
1586                action_log.update(cx, |action_log, cx| {
1587                    action_log.buffer_read(buffer.clone(), cx);
1588                });
1589                buffer.update(cx, |buffer, cx| {
1590                    buffer.edit(edits, None, cx);
1591                });
1592                action_log.update(cx, |action_log, cx| {
1593                    action_log.buffer_edited(buffer.clone(), cx);
1594                });
1595            })?;
1596            project
1597                .update(cx, |project, cx| project.save_buffer(buffer, cx))?
1598                .await
1599        })
1600    }
1601
1602    pub fn to_markdown(&self, cx: &App) -> String {
1603        self.entries.iter().map(|e| e.to_markdown(cx)).collect()
1604    }
1605
1606    pub fn emit_server_exited(&mut self, status: ExitStatus, cx: &mut Context<Self>) {
1607        cx.emit(AcpThreadEvent::ServerExited(status));
1608    }
1609}
1610
1611fn markdown_for_raw_output(
1612    raw_output: &serde_json::Value,
1613    language_registry: &Arc<LanguageRegistry>,
1614    cx: &mut App,
1615) -> Option<Entity<Markdown>> {
1616    match raw_output {
1617        serde_json::Value::Null => None,
1618        serde_json::Value::Bool(value) => Some(cx.new(|cx| {
1619            Markdown::new(
1620                value.to_string().into(),
1621                Some(language_registry.clone()),
1622                None,
1623                cx,
1624            )
1625        })),
1626        serde_json::Value::Number(value) => Some(cx.new(|cx| {
1627            Markdown::new(
1628                value.to_string().into(),
1629                Some(language_registry.clone()),
1630                None,
1631                cx,
1632            )
1633        })),
1634        serde_json::Value::String(value) => Some(cx.new(|cx| {
1635            Markdown::new(
1636                value.clone().into(),
1637                Some(language_registry.clone()),
1638                None,
1639                cx,
1640            )
1641        })),
1642        value => Some(cx.new(|cx| {
1643            Markdown::new(
1644                format!("```json\n{}\n```", value).into(),
1645                Some(language_registry.clone()),
1646                None,
1647                cx,
1648            )
1649        })),
1650    }
1651}
1652
1653#[cfg(test)]
1654mod tests {
1655    use super::*;
1656    use anyhow::anyhow;
1657    use futures::{channel::mpsc, future::LocalBoxFuture, select};
1658    use gpui::{App, AsyncApp, TestAppContext, WeakEntity};
1659    use indoc::indoc;
1660    use project::{FakeFs, Fs};
1661    use rand::Rng as _;
1662    use serde_json::json;
1663    use settings::SettingsStore;
1664    use smol::stream::StreamExt as _;
1665    use std::{
1666        any::Any,
1667        cell::RefCell,
1668        path::Path,
1669        rc::Rc,
1670        sync::atomic::{AtomicBool, AtomicUsize, Ordering::SeqCst},
1671        time::Duration,
1672    };
1673    use util::path;
1674
1675    fn init_test(cx: &mut TestAppContext) {
1676        env_logger::try_init().ok();
1677        cx.update(|cx| {
1678            let settings_store = SettingsStore::test(cx);
1679            cx.set_global(settings_store);
1680            Project::init_settings(cx);
1681            language::init(cx);
1682        });
1683    }
1684
1685    #[gpui::test]
1686    async fn test_push_user_content_block(cx: &mut gpui::TestAppContext) {
1687        init_test(cx);
1688
1689        let fs = FakeFs::new(cx.executor());
1690        let project = Project::test(fs, [], cx).await;
1691        let connection = Rc::new(FakeAgentConnection::new());
1692        let thread = cx
1693            .update(|cx| connection.new_thread(project, Path::new(path!("/test")), cx))
1694            .await
1695            .unwrap();
1696
1697        // Test creating a new user message
1698        thread.update(cx, |thread, cx| {
1699            thread.push_user_content_block(
1700                None,
1701                acp::ContentBlock::Text(acp::TextContent {
1702                    annotations: None,
1703                    text: "Hello, ".to_string(),
1704                }),
1705                cx,
1706            );
1707        });
1708
1709        thread.update(cx, |thread, cx| {
1710            assert_eq!(thread.entries.len(), 1);
1711            if let AgentThreadEntry::UserMessage(user_msg) = &thread.entries[0] {
1712                assert_eq!(user_msg.id, None);
1713                assert_eq!(user_msg.content.to_markdown(cx), "Hello, ");
1714            } else {
1715                panic!("Expected UserMessage");
1716            }
1717        });
1718
1719        // Test appending to existing user message
1720        let message_1_id = UserMessageId::new();
1721        thread.update(cx, |thread, cx| {
1722            thread.push_user_content_block(
1723                Some(message_1_id.clone()),
1724                acp::ContentBlock::Text(acp::TextContent {
1725                    annotations: None,
1726                    text: "world!".to_string(),
1727                }),
1728                cx,
1729            );
1730        });
1731
1732        thread.update(cx, |thread, cx| {
1733            assert_eq!(thread.entries.len(), 1);
1734            if let AgentThreadEntry::UserMessage(user_msg) = &thread.entries[0] {
1735                assert_eq!(user_msg.id, Some(message_1_id));
1736                assert_eq!(user_msg.content.to_markdown(cx), "Hello, world!");
1737            } else {
1738                panic!("Expected UserMessage");
1739            }
1740        });
1741
1742        // Test creating new user message after assistant message
1743        thread.update(cx, |thread, cx| {
1744            thread.push_assistant_content_block(
1745                acp::ContentBlock::Text(acp::TextContent {
1746                    annotations: None,
1747                    text: "Assistant response".to_string(),
1748                }),
1749                false,
1750                cx,
1751            );
1752        });
1753
1754        let message_2_id = UserMessageId::new();
1755        thread.update(cx, |thread, cx| {
1756            thread.push_user_content_block(
1757                Some(message_2_id.clone()),
1758                acp::ContentBlock::Text(acp::TextContent {
1759                    annotations: None,
1760                    text: "New user message".to_string(),
1761                }),
1762                cx,
1763            );
1764        });
1765
1766        thread.update(cx, |thread, cx| {
1767            assert_eq!(thread.entries.len(), 3);
1768            if let AgentThreadEntry::UserMessage(user_msg) = &thread.entries[2] {
1769                assert_eq!(user_msg.id, Some(message_2_id));
1770                assert_eq!(user_msg.content.to_markdown(cx), "New user message");
1771            } else {
1772                panic!("Expected UserMessage at index 2");
1773            }
1774        });
1775    }
1776
1777    #[gpui::test]
1778    async fn test_thinking_concatenation(cx: &mut gpui::TestAppContext) {
1779        init_test(cx);
1780
1781        let fs = FakeFs::new(cx.executor());
1782        let project = Project::test(fs, [], cx).await;
1783        let connection = Rc::new(FakeAgentConnection::new().on_user_message(
1784            |_, thread, mut cx| {
1785                async move {
1786                    thread.update(&mut cx, |thread, cx| {
1787                        thread
1788                            .handle_session_update(
1789                                acp::SessionUpdate::AgentThoughtChunk {
1790                                    content: "Thinking ".into(),
1791                                },
1792                                cx,
1793                            )
1794                            .unwrap();
1795                        thread
1796                            .handle_session_update(
1797                                acp::SessionUpdate::AgentThoughtChunk {
1798                                    content: "hard!".into(),
1799                                },
1800                                cx,
1801                            )
1802                            .unwrap();
1803                    })?;
1804                    Ok(acp::PromptResponse {
1805                        stop_reason: acp::StopReason::EndTurn,
1806                    })
1807                }
1808                .boxed_local()
1809            },
1810        ));
1811
1812        let thread = cx
1813            .update(|cx| connection.new_thread(project, Path::new(path!("/test")), cx))
1814            .await
1815            .unwrap();
1816
1817        thread
1818            .update(cx, |thread, cx| thread.send_raw("Hello from Zed!", cx))
1819            .await
1820            .unwrap();
1821
1822        let output = thread.read_with(cx, |thread, cx| thread.to_markdown(cx));
1823        assert_eq!(
1824            output,
1825            indoc! {r#"
1826            ## User
1827
1828            Hello from Zed!
1829
1830            ## Assistant
1831
1832            <thinking>
1833            Thinking hard!
1834            </thinking>
1835
1836            "#}
1837        );
1838    }
1839
1840    #[gpui::test]
1841    async fn test_edits_concurrently_to_user(cx: &mut TestAppContext) {
1842        init_test(cx);
1843
1844        let fs = FakeFs::new(cx.executor());
1845        fs.insert_tree(path!("/tmp"), json!({"foo": "one\ntwo\nthree\n"}))
1846            .await;
1847        let project = Project::test(fs.clone(), [], cx).await;
1848        let (read_file_tx, read_file_rx) = oneshot::channel::<()>();
1849        let read_file_tx = Rc::new(RefCell::new(Some(read_file_tx)));
1850        let connection = Rc::new(FakeAgentConnection::new().on_user_message(
1851            move |_, thread, mut cx| {
1852                let read_file_tx = read_file_tx.clone();
1853                async move {
1854                    let content = thread
1855                        .update(&mut cx, |thread, cx| {
1856                            thread.read_text_file(path!("/tmp/foo").into(), None, None, false, cx)
1857                        })
1858                        .unwrap()
1859                        .await
1860                        .unwrap();
1861                    assert_eq!(content, "one\ntwo\nthree\n");
1862                    read_file_tx.take().unwrap().send(()).unwrap();
1863                    thread
1864                        .update(&mut cx, |thread, cx| {
1865                            thread.write_text_file(
1866                                path!("/tmp/foo").into(),
1867                                "one\ntwo\nthree\nfour\nfive\n".to_string(),
1868                                cx,
1869                            )
1870                        })
1871                        .unwrap()
1872                        .await
1873                        .unwrap();
1874                    Ok(acp::PromptResponse {
1875                        stop_reason: acp::StopReason::EndTurn,
1876                    })
1877                }
1878                .boxed_local()
1879            },
1880        ));
1881
1882        let (worktree, pathbuf) = project
1883            .update(cx, |project, cx| {
1884                project.find_or_create_worktree(path!("/tmp/foo"), true, cx)
1885            })
1886            .await
1887            .unwrap();
1888        let buffer = project
1889            .update(cx, |project, cx| {
1890                project.open_buffer((worktree.read(cx).id(), pathbuf), cx)
1891            })
1892            .await
1893            .unwrap();
1894
1895        let thread = cx
1896            .update(|cx| connection.new_thread(project, Path::new(path!("/tmp")), cx))
1897            .await
1898            .unwrap();
1899
1900        let request = thread.update(cx, |thread, cx| {
1901            thread.send_raw("Extend the count in /tmp/foo", cx)
1902        });
1903        read_file_rx.await.ok();
1904        buffer.update(cx, |buffer, cx| {
1905            buffer.edit([(0..0, "zero\n".to_string())], None, cx);
1906        });
1907        cx.run_until_parked();
1908        assert_eq!(
1909            buffer.read_with(cx, |buffer, _| buffer.text()),
1910            "zero\none\ntwo\nthree\nfour\nfive\n"
1911        );
1912        assert_eq!(
1913            String::from_utf8(fs.read_file_sync(path!("/tmp/foo")).unwrap()).unwrap(),
1914            "zero\none\ntwo\nthree\nfour\nfive\n"
1915        );
1916        request.await.unwrap();
1917    }
1918
1919    #[gpui::test]
1920    async fn test_succeeding_canceled_toolcall(cx: &mut TestAppContext) {
1921        init_test(cx);
1922
1923        let fs = FakeFs::new(cx.executor());
1924        let project = Project::test(fs, [], cx).await;
1925        let id = acp::ToolCallId("test".into());
1926
1927        let connection = Rc::new(FakeAgentConnection::new().on_user_message({
1928            let id = id.clone();
1929            move |_, thread, mut cx| {
1930                let id = id.clone();
1931                async move {
1932                    thread
1933                        .update(&mut cx, |thread, cx| {
1934                            thread.handle_session_update(
1935                                acp::SessionUpdate::ToolCall(acp::ToolCall {
1936                                    id: id.clone(),
1937                                    title: "Label".into(),
1938                                    kind: acp::ToolKind::Fetch,
1939                                    status: acp::ToolCallStatus::InProgress,
1940                                    content: vec![],
1941                                    locations: vec![],
1942                                    raw_input: None,
1943                                    raw_output: None,
1944                                }),
1945                                cx,
1946                            )
1947                        })
1948                        .unwrap()
1949                        .unwrap();
1950                    Ok(acp::PromptResponse {
1951                        stop_reason: acp::StopReason::EndTurn,
1952                    })
1953                }
1954                .boxed_local()
1955            }
1956        }));
1957
1958        let thread = cx
1959            .update(|cx| connection.new_thread(project, Path::new(path!("/test")), cx))
1960            .await
1961            .unwrap();
1962
1963        let request = thread.update(cx, |thread, cx| {
1964            thread.send_raw("Fetch https://example.com", cx)
1965        });
1966
1967        run_until_first_tool_call(&thread, cx).await;
1968
1969        thread.read_with(cx, |thread, _| {
1970            assert!(matches!(
1971                thread.entries[1],
1972                AgentThreadEntry::ToolCall(ToolCall {
1973                    status: ToolCallStatus::InProgress,
1974                    ..
1975                })
1976            ));
1977        });
1978
1979        thread.update(cx, |thread, cx| thread.cancel(cx)).await;
1980
1981        thread.read_with(cx, |thread, _| {
1982            assert!(matches!(
1983                &thread.entries[1],
1984                AgentThreadEntry::ToolCall(ToolCall {
1985                    status: ToolCallStatus::Canceled,
1986                    ..
1987                })
1988            ));
1989        });
1990
1991        thread
1992            .update(cx, |thread, cx| {
1993                thread.handle_session_update(
1994                    acp::SessionUpdate::ToolCallUpdate(acp::ToolCallUpdate {
1995                        id,
1996                        fields: acp::ToolCallUpdateFields {
1997                            status: Some(acp::ToolCallStatus::Completed),
1998                            ..Default::default()
1999                        },
2000                    }),
2001                    cx,
2002                )
2003            })
2004            .unwrap();
2005
2006        request.await.unwrap();
2007
2008        thread.read_with(cx, |thread, _| {
2009            assert!(matches!(
2010                thread.entries[1],
2011                AgentThreadEntry::ToolCall(ToolCall {
2012                    status: ToolCallStatus::Completed,
2013                    ..
2014                })
2015            ));
2016        });
2017    }
2018
2019    #[gpui::test]
2020    async fn test_no_pending_edits_if_tool_calls_are_completed(cx: &mut TestAppContext) {
2021        init_test(cx);
2022        let fs = FakeFs::new(cx.background_executor.clone());
2023        fs.insert_tree(path!("/test"), json!({})).await;
2024        let project = Project::test(fs, [path!("/test").as_ref()], cx).await;
2025
2026        let connection = Rc::new(FakeAgentConnection::new().on_user_message({
2027            move |_, thread, mut cx| {
2028                async move {
2029                    thread
2030                        .update(&mut cx, |thread, cx| {
2031                            thread.handle_session_update(
2032                                acp::SessionUpdate::ToolCall(acp::ToolCall {
2033                                    id: acp::ToolCallId("test".into()),
2034                                    title: "Label".into(),
2035                                    kind: acp::ToolKind::Edit,
2036                                    status: acp::ToolCallStatus::Completed,
2037                                    content: vec![acp::ToolCallContent::Diff {
2038                                        diff: acp::Diff {
2039                                            path: "/test/test.txt".into(),
2040                                            old_text: None,
2041                                            new_text: "foo".into(),
2042                                        },
2043                                    }],
2044                                    locations: vec![],
2045                                    raw_input: None,
2046                                    raw_output: None,
2047                                }),
2048                                cx,
2049                            )
2050                        })
2051                        .unwrap()
2052                        .unwrap();
2053                    Ok(acp::PromptResponse {
2054                        stop_reason: acp::StopReason::EndTurn,
2055                    })
2056                }
2057                .boxed_local()
2058            }
2059        }));
2060
2061        let thread = cx
2062            .update(|cx| connection.new_thread(project, Path::new(path!("/test")), cx))
2063            .await
2064            .unwrap();
2065
2066        cx.update(|cx| thread.update(cx, |thread, cx| thread.send(vec!["Hi".into()], cx)))
2067            .await
2068            .unwrap();
2069
2070        assert!(cx.read(|cx| !thread.read(cx).has_pending_edit_tool_calls()));
2071    }
2072
2073    #[gpui::test(iterations = 10)]
2074    async fn test_checkpoints(cx: &mut TestAppContext) {
2075        init_test(cx);
2076        let fs = FakeFs::new(cx.background_executor.clone());
2077        fs.insert_tree(
2078            path!("/test"),
2079            json!({
2080                ".git": {}
2081            }),
2082        )
2083        .await;
2084        let project = Project::test(fs.clone(), [path!("/test").as_ref()], cx).await;
2085
2086        let simulate_changes = Arc::new(AtomicBool::new(true));
2087        let next_filename = Arc::new(AtomicUsize::new(0));
2088        let connection = Rc::new(FakeAgentConnection::new().on_user_message({
2089            let simulate_changes = simulate_changes.clone();
2090            let next_filename = next_filename.clone();
2091            let fs = fs.clone();
2092            move |request, thread, mut cx| {
2093                let fs = fs.clone();
2094                let simulate_changes = simulate_changes.clone();
2095                let next_filename = next_filename.clone();
2096                async move {
2097                    if simulate_changes.load(SeqCst) {
2098                        let filename = format!("/test/file-{}", next_filename.fetch_add(1, SeqCst));
2099                        fs.write(Path::new(&filename), b"").await?;
2100                    }
2101
2102                    let acp::ContentBlock::Text(content) = &request.prompt[0] else {
2103                        panic!("expected text content block");
2104                    };
2105                    thread.update(&mut cx, |thread, cx| {
2106                        thread
2107                            .handle_session_update(
2108                                acp::SessionUpdate::AgentMessageChunk {
2109                                    content: content.text.to_uppercase().into(),
2110                                },
2111                                cx,
2112                            )
2113                            .unwrap();
2114                    })?;
2115                    Ok(acp::PromptResponse {
2116                        stop_reason: acp::StopReason::EndTurn,
2117                    })
2118                }
2119                .boxed_local()
2120            }
2121        }));
2122        let thread = cx
2123            .update(|cx| connection.new_thread(project, Path::new(path!("/test")), cx))
2124            .await
2125            .unwrap();
2126
2127        cx.update(|cx| thread.update(cx, |thread, cx| thread.send(vec!["Lorem".into()], cx)))
2128            .await
2129            .unwrap();
2130        thread.read_with(cx, |thread, cx| {
2131            assert_eq!(
2132                thread.to_markdown(cx),
2133                indoc! {"
2134                    ## User (checkpoint)
2135
2136                    Lorem
2137
2138                    ## Assistant
2139
2140                    LOREM
2141
2142                "}
2143            );
2144        });
2145        assert_eq!(fs.files(), vec![Path::new("/test/file-0")]);
2146
2147        cx.update(|cx| thread.update(cx, |thread, cx| thread.send(vec!["ipsum".into()], cx)))
2148            .await
2149            .unwrap();
2150        thread.read_with(cx, |thread, cx| {
2151            assert_eq!(
2152                thread.to_markdown(cx),
2153                indoc! {"
2154                    ## User (checkpoint)
2155
2156                    Lorem
2157
2158                    ## Assistant
2159
2160                    LOREM
2161
2162                    ## User (checkpoint)
2163
2164                    ipsum
2165
2166                    ## Assistant
2167
2168                    IPSUM
2169
2170                "}
2171            );
2172        });
2173        assert_eq!(
2174            fs.files(),
2175            vec![Path::new("/test/file-0"), Path::new("/test/file-1")]
2176        );
2177
2178        // Checkpoint isn't stored when there are no changes.
2179        simulate_changes.store(false, SeqCst);
2180        cx.update(|cx| thread.update(cx, |thread, cx| thread.send(vec!["dolor".into()], cx)))
2181            .await
2182            .unwrap();
2183        thread.read_with(cx, |thread, cx| {
2184            assert_eq!(
2185                thread.to_markdown(cx),
2186                indoc! {"
2187                    ## User (checkpoint)
2188
2189                    Lorem
2190
2191                    ## Assistant
2192
2193                    LOREM
2194
2195                    ## User (checkpoint)
2196
2197                    ipsum
2198
2199                    ## Assistant
2200
2201                    IPSUM
2202
2203                    ## User
2204
2205                    dolor
2206
2207                    ## Assistant
2208
2209                    DOLOR
2210
2211                "}
2212            );
2213        });
2214        assert_eq!(
2215            fs.files(),
2216            vec![Path::new("/test/file-0"), Path::new("/test/file-1")]
2217        );
2218
2219        // Rewinding the conversation truncates the history and restores the checkpoint.
2220        thread
2221            .update(cx, |thread, cx| {
2222                let AgentThreadEntry::UserMessage(message) = &thread.entries[2] else {
2223                    panic!("unexpected entries {:?}", thread.entries)
2224                };
2225                thread.rewind(message.id.clone().unwrap(), cx)
2226            })
2227            .await
2228            .unwrap();
2229        thread.read_with(cx, |thread, cx| {
2230            assert_eq!(
2231                thread.to_markdown(cx),
2232                indoc! {"
2233                    ## User (checkpoint)
2234
2235                    Lorem
2236
2237                    ## Assistant
2238
2239                    LOREM
2240
2241                "}
2242            );
2243        });
2244        assert_eq!(fs.files(), vec![Path::new("/test/file-0")]);
2245    }
2246
2247    async fn run_until_first_tool_call(
2248        thread: &Entity<AcpThread>,
2249        cx: &mut TestAppContext,
2250    ) -> usize {
2251        let (mut tx, mut rx) = mpsc::channel::<usize>(1);
2252
2253        let subscription = cx.update(|cx| {
2254            cx.subscribe(thread, move |thread, _, cx| {
2255                for (ix, entry) in thread.read(cx).entries.iter().enumerate() {
2256                    if matches!(entry, AgentThreadEntry::ToolCall(_)) {
2257                        return tx.try_send(ix).unwrap();
2258                    }
2259                }
2260            })
2261        });
2262
2263        select! {
2264            _ = futures::FutureExt::fuse(smol::Timer::after(Duration::from_secs(10))) => {
2265                panic!("Timeout waiting for tool call")
2266            }
2267            ix = rx.next().fuse() => {
2268                drop(subscription);
2269                ix.unwrap()
2270            }
2271        }
2272    }
2273
2274    #[derive(Clone, Default)]
2275    struct FakeAgentConnection {
2276        auth_methods: Vec<acp::AuthMethod>,
2277        sessions: Arc<parking_lot::Mutex<HashMap<acp::SessionId, WeakEntity<AcpThread>>>>,
2278        on_user_message: Option<
2279            Rc<
2280                dyn Fn(
2281                        acp::PromptRequest,
2282                        WeakEntity<AcpThread>,
2283                        AsyncApp,
2284                    ) -> LocalBoxFuture<'static, Result<acp::PromptResponse>>
2285                    + 'static,
2286            >,
2287        >,
2288    }
2289
2290    impl FakeAgentConnection {
2291        fn new() -> Self {
2292            Self {
2293                auth_methods: Vec::new(),
2294                on_user_message: None,
2295                sessions: Arc::default(),
2296            }
2297        }
2298
2299        #[expect(unused)]
2300        fn with_auth_methods(mut self, auth_methods: Vec<acp::AuthMethod>) -> Self {
2301            self.auth_methods = auth_methods;
2302            self
2303        }
2304
2305        fn on_user_message(
2306            mut self,
2307            handler: impl Fn(
2308                acp::PromptRequest,
2309                WeakEntity<AcpThread>,
2310                AsyncApp,
2311            ) -> LocalBoxFuture<'static, Result<acp::PromptResponse>>
2312            + 'static,
2313        ) -> Self {
2314            self.on_user_message.replace(Rc::new(handler));
2315            self
2316        }
2317    }
2318
2319    impl AgentConnection for FakeAgentConnection {
2320        fn auth_methods(&self) -> &[acp::AuthMethod] {
2321            &self.auth_methods
2322        }
2323
2324        fn new_thread(
2325            self: Rc<Self>,
2326            project: Entity<Project>,
2327            _cwd: &Path,
2328            cx: &mut App,
2329        ) -> Task<gpui::Result<Entity<AcpThread>>> {
2330            let session_id = acp::SessionId(
2331                rand::thread_rng()
2332                    .sample_iter(&rand::distributions::Alphanumeric)
2333                    .take(7)
2334                    .map(char::from)
2335                    .collect::<String>()
2336                    .into(),
2337            );
2338            let thread =
2339                cx.new(|cx| AcpThread::new("Test", self.clone(), project, session_id.clone(), cx));
2340            self.sessions.lock().insert(session_id, thread.downgrade());
2341            Task::ready(Ok(thread))
2342        }
2343
2344        fn authenticate(&self, method: acp::AuthMethodId, _cx: &mut App) -> Task<gpui::Result<()>> {
2345            if self.auth_methods().iter().any(|m| m.id == method) {
2346                Task::ready(Ok(()))
2347            } else {
2348                Task::ready(Err(anyhow!("Invalid Auth Method")))
2349            }
2350        }
2351
2352        fn prompt(
2353            &self,
2354            _id: Option<UserMessageId>,
2355            params: acp::PromptRequest,
2356            cx: &mut App,
2357        ) -> Task<gpui::Result<acp::PromptResponse>> {
2358            let sessions = self.sessions.lock();
2359            let thread = sessions.get(&params.session_id).unwrap();
2360            if let Some(handler) = &self.on_user_message {
2361                let handler = handler.clone();
2362                let thread = thread.clone();
2363                cx.spawn(async move |cx| handler(params, thread, cx.clone()).await)
2364            } else {
2365                Task::ready(Ok(acp::PromptResponse {
2366                    stop_reason: acp::StopReason::EndTurn,
2367                }))
2368            }
2369        }
2370
2371        fn cancel(&self, session_id: &acp::SessionId, cx: &mut App) {
2372            let sessions = self.sessions.lock();
2373            let thread = sessions.get(&session_id).unwrap().clone();
2374
2375            cx.spawn(async move |cx| {
2376                thread
2377                    .update(cx, |thread, cx| thread.cancel(cx))
2378                    .unwrap()
2379                    .await
2380            })
2381            .detach();
2382        }
2383
2384        fn session_editor(
2385            &self,
2386            session_id: &acp::SessionId,
2387            _cx: &mut App,
2388        ) -> Option<Rc<dyn AgentSessionEditor>> {
2389            Some(Rc::new(FakeAgentSessionEditor {
2390                _session_id: session_id.clone(),
2391            }))
2392        }
2393
2394        fn into_any(self: Rc<Self>) -> Rc<dyn Any> {
2395            self
2396        }
2397    }
2398
2399    struct FakeAgentSessionEditor {
2400        _session_id: acp::SessionId,
2401    }
2402
2403    impl AgentSessionEditor for FakeAgentSessionEditor {
2404        fn truncate(&self, _message_id: UserMessageId, _cx: &mut App) -> Task<Result<()>> {
2405            Task::ready(Ok(()))
2406        }
2407    }
2408}