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
 692#[derive(Debug)]
 693pub enum AcpThreadEvent {
 694    NewEntry,
 695    TitleUpdated,
 696    EntryUpdated(usize),
 697    EntriesRemoved(Range<usize>),
 698    ToolAuthorizationRequired,
 699    Stopped,
 700    Error,
 701    ServerExited(ExitStatus),
 702}
 703
 704impl EventEmitter<AcpThreadEvent> for AcpThread {}
 705
 706#[derive(PartialEq, Eq)]
 707pub enum ThreadStatus {
 708    Idle,
 709    WaitingForToolConfirmation,
 710    Generating,
 711}
 712
 713#[derive(Debug, Clone)]
 714pub enum LoadError {
 715    Unsupported {
 716        error_message: SharedString,
 717        upgrade_message: SharedString,
 718        upgrade_command: String,
 719    },
 720    Exited(i32),
 721    Other(SharedString),
 722}
 723
 724impl Display for LoadError {
 725    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
 726        match self {
 727            LoadError::Unsupported { error_message, .. } => write!(f, "{}", error_message),
 728            LoadError::Exited(status) => write!(f, "Server exited with status {}", status),
 729            LoadError::Other(msg) => write!(f, "{}", msg),
 730        }
 731    }
 732}
 733
 734impl Error for LoadError {}
 735
 736impl AcpThread {
 737    pub fn new(
 738        title: impl Into<SharedString>,
 739        connection: Rc<dyn AgentConnection>,
 740        project: Entity<Project>,
 741        session_id: acp::SessionId,
 742        cx: &mut Context<Self>,
 743    ) -> Self {
 744        let action_log = cx.new(|_| ActionLog::new(project.clone()));
 745
 746        Self {
 747            action_log,
 748            shared_buffers: Default::default(),
 749            entries: Default::default(),
 750            plan: Default::default(),
 751            title: title.into(),
 752            project,
 753            send_task: None,
 754            connection,
 755            session_id,
 756        }
 757    }
 758
 759    pub fn connection(&self) -> &Rc<dyn AgentConnection> {
 760        &self.connection
 761    }
 762
 763    pub fn action_log(&self) -> &Entity<ActionLog> {
 764        &self.action_log
 765    }
 766
 767    pub fn project(&self) -> &Entity<Project> {
 768        &self.project
 769    }
 770
 771    pub fn title(&self) -> SharedString {
 772        self.title.clone()
 773    }
 774
 775    pub fn entries(&self) -> &[AgentThreadEntry] {
 776        &self.entries
 777    }
 778
 779    pub fn session_id(&self) -> &acp::SessionId {
 780        &self.session_id
 781    }
 782
 783    pub fn status(&self) -> ThreadStatus {
 784        if self.send_task.is_some() {
 785            if self.waiting_for_tool_confirmation() {
 786                ThreadStatus::WaitingForToolConfirmation
 787            } else {
 788                ThreadStatus::Generating
 789            }
 790        } else {
 791            ThreadStatus::Idle
 792        }
 793    }
 794
 795    pub fn has_pending_edit_tool_calls(&self) -> bool {
 796        for entry in self.entries.iter().rev() {
 797            match entry {
 798                AgentThreadEntry::UserMessage(_) => return false,
 799                AgentThreadEntry::ToolCall(
 800                    call @ ToolCall {
 801                        status: ToolCallStatus::InProgress | ToolCallStatus::Pending,
 802                        ..
 803                    },
 804                ) if call.diffs().next().is_some() => {
 805                    return true;
 806                }
 807                AgentThreadEntry::ToolCall(_) | AgentThreadEntry::AssistantMessage(_) => {}
 808            }
 809        }
 810
 811        false
 812    }
 813
 814    pub fn used_tools_since_last_user_message(&self) -> bool {
 815        for entry in self.entries.iter().rev() {
 816            match entry {
 817                AgentThreadEntry::UserMessage(..) => return false,
 818                AgentThreadEntry::AssistantMessage(..) => continue,
 819                AgentThreadEntry::ToolCall(..) => return true,
 820            }
 821        }
 822
 823        false
 824    }
 825
 826    pub fn handle_session_update(
 827        &mut self,
 828        update: acp::SessionUpdate,
 829        cx: &mut Context<Self>,
 830    ) -> Result<(), acp::Error> {
 831        match update {
 832            acp::SessionUpdate::UserMessageChunk { content } => {
 833                self.push_user_content_block(None, content, cx);
 834            }
 835            acp::SessionUpdate::AgentMessageChunk { content } => {
 836                self.push_assistant_content_block(content, false, cx);
 837            }
 838            acp::SessionUpdate::AgentThoughtChunk { content } => {
 839                self.push_assistant_content_block(content, true, cx);
 840            }
 841            acp::SessionUpdate::ToolCall(tool_call) => {
 842                self.upsert_tool_call(tool_call, cx)?;
 843            }
 844            acp::SessionUpdate::ToolCallUpdate(tool_call_update) => {
 845                self.update_tool_call(tool_call_update, cx)?;
 846            }
 847            acp::SessionUpdate::Plan(plan) => {
 848                self.update_plan(plan, cx);
 849            }
 850        }
 851        Ok(())
 852    }
 853
 854    pub fn push_user_content_block(
 855        &mut self,
 856        message_id: Option<UserMessageId>,
 857        chunk: acp::ContentBlock,
 858        cx: &mut Context<Self>,
 859    ) {
 860        let language_registry = self.project.read(cx).languages().clone();
 861        let entries_len = self.entries.len();
 862
 863        if let Some(last_entry) = self.entries.last_mut()
 864            && let AgentThreadEntry::UserMessage(UserMessage {
 865                id,
 866                content,
 867                chunks,
 868                ..
 869            }) = last_entry
 870        {
 871            *id = message_id.or(id.take());
 872            content.append(chunk.clone(), &language_registry, cx);
 873            chunks.push(chunk);
 874            let idx = entries_len - 1;
 875            cx.emit(AcpThreadEvent::EntryUpdated(idx));
 876        } else {
 877            let content = ContentBlock::new(chunk.clone(), &language_registry, cx);
 878            self.push_entry(
 879                AgentThreadEntry::UserMessage(UserMessage {
 880                    id: message_id,
 881                    content,
 882                    chunks: vec![chunk],
 883                    checkpoint: None,
 884                }),
 885                cx,
 886            );
 887        }
 888    }
 889
 890    pub fn push_assistant_content_block(
 891        &mut self,
 892        chunk: acp::ContentBlock,
 893        is_thought: bool,
 894        cx: &mut Context<Self>,
 895    ) {
 896        let language_registry = self.project.read(cx).languages().clone();
 897        let entries_len = self.entries.len();
 898        if let Some(last_entry) = self.entries.last_mut()
 899            && let AgentThreadEntry::AssistantMessage(AssistantMessage { chunks }) = last_entry
 900        {
 901            let idx = entries_len - 1;
 902            cx.emit(AcpThreadEvent::EntryUpdated(idx));
 903            match (chunks.last_mut(), is_thought) {
 904                (Some(AssistantMessageChunk::Message { block }), false)
 905                | (Some(AssistantMessageChunk::Thought { block }), true) => {
 906                    block.append(chunk, &language_registry, cx)
 907                }
 908                _ => {
 909                    let block = ContentBlock::new(chunk, &language_registry, cx);
 910                    if is_thought {
 911                        chunks.push(AssistantMessageChunk::Thought { block })
 912                    } else {
 913                        chunks.push(AssistantMessageChunk::Message { block })
 914                    }
 915                }
 916            }
 917        } else {
 918            let block = ContentBlock::new(chunk, &language_registry, cx);
 919            let chunk = if is_thought {
 920                AssistantMessageChunk::Thought { block }
 921            } else {
 922                AssistantMessageChunk::Message { block }
 923            };
 924
 925            self.push_entry(
 926                AgentThreadEntry::AssistantMessage(AssistantMessage {
 927                    chunks: vec![chunk],
 928                }),
 929                cx,
 930            );
 931        }
 932    }
 933
 934    fn push_entry(&mut self, entry: AgentThreadEntry, cx: &mut Context<Self>) {
 935        self.entries.push(entry);
 936        cx.emit(AcpThreadEvent::NewEntry);
 937    }
 938
 939    pub fn update_title(&mut self, title: SharedString, cx: &mut Context<Self>) -> Result<()> {
 940        dbg!("update title", &title);
 941        self.title = title;
 942        cx.emit(AcpThreadEvent::TitleUpdated);
 943        Ok(())
 944    }
 945
 946    pub fn update_tool_call(
 947        &mut self,
 948        update: impl Into<ToolCallUpdate>,
 949        cx: &mut Context<Self>,
 950    ) -> Result<()> {
 951        let update = update.into();
 952        let languages = self.project.read(cx).languages().clone();
 953
 954        let (ix, current_call) = self
 955            .tool_call_mut(update.id())
 956            .context("Tool call not found")?;
 957        match update {
 958            ToolCallUpdate::UpdateFields(update) => {
 959                let location_updated = update.fields.locations.is_some();
 960                current_call.update_fields(update.fields, languages, cx);
 961                if location_updated {
 962                    self.resolve_locations(update.id.clone(), cx);
 963                }
 964            }
 965            ToolCallUpdate::UpdateDiff(update) => {
 966                current_call.content.clear();
 967                current_call
 968                    .content
 969                    .push(ToolCallContent::Diff(update.diff));
 970            }
 971            ToolCallUpdate::UpdateTerminal(update) => {
 972                current_call.content.clear();
 973                current_call
 974                    .content
 975                    .push(ToolCallContent::Terminal(update.terminal));
 976            }
 977        }
 978
 979        cx.emit(AcpThreadEvent::EntryUpdated(ix));
 980
 981        Ok(())
 982    }
 983
 984    /// Updates a tool call if id matches an existing entry, otherwise inserts a new one.
 985    pub fn upsert_tool_call(
 986        &mut self,
 987        tool_call: acp::ToolCall,
 988        cx: &mut Context<Self>,
 989    ) -> Result<(), acp::Error> {
 990        let status = tool_call.status.into();
 991        self.upsert_tool_call_inner(tool_call.into(), status, cx)
 992    }
 993
 994    /// Fails if id does not match an existing entry.
 995    pub fn upsert_tool_call_inner(
 996        &mut self,
 997        tool_call_update: acp::ToolCallUpdate,
 998        status: ToolCallStatus,
 999        cx: &mut Context<Self>,
1000    ) -> Result<(), acp::Error> {
1001        let language_registry = self.project.read(cx).languages().clone();
1002        let id = tool_call_update.id.clone();
1003
1004        if let Some((ix, current_call)) = self.tool_call_mut(&id) {
1005            current_call.update_fields(tool_call_update.fields, language_registry, cx);
1006            current_call.status = status;
1007
1008            cx.emit(AcpThreadEvent::EntryUpdated(ix));
1009        } else {
1010            let call =
1011                ToolCall::from_acp(tool_call_update.try_into()?, status, language_registry, cx);
1012            self.push_entry(AgentThreadEntry::ToolCall(call), cx);
1013        };
1014
1015        self.resolve_locations(id, cx);
1016        Ok(())
1017    }
1018
1019    fn tool_call_mut(&mut self, id: &acp::ToolCallId) -> Option<(usize, &mut ToolCall)> {
1020        // The tool call we are looking for is typically the last one, or very close to the end.
1021        // At the moment, it doesn't seem like a hashmap would be a good fit for this use case.
1022        self.entries
1023            .iter_mut()
1024            .enumerate()
1025            .rev()
1026            .find_map(|(index, tool_call)| {
1027                if let AgentThreadEntry::ToolCall(tool_call) = tool_call
1028                    && &tool_call.id == id
1029                {
1030                    Some((index, tool_call))
1031                } else {
1032                    None
1033                }
1034            })
1035    }
1036
1037    pub fn resolve_locations(&mut self, id: acp::ToolCallId, cx: &mut Context<Self>) {
1038        let project = self.project.clone();
1039        let Some((_, tool_call)) = self.tool_call_mut(&id) else {
1040            return;
1041        };
1042        let task = tool_call.resolve_locations(project, cx);
1043        cx.spawn(async move |this, cx| {
1044            let resolved_locations = task.await;
1045            this.update(cx, |this, cx| {
1046                let project = this.project.clone();
1047                let Some((ix, tool_call)) = this.tool_call_mut(&id) else {
1048                    return;
1049                };
1050                if let Some(Some(location)) = resolved_locations.last() {
1051                    project.update(cx, |project, cx| {
1052                        if let Some(agent_location) = project.agent_location() {
1053                            let should_ignore = agent_location.buffer == location.buffer
1054                                && location
1055                                    .buffer
1056                                    .update(cx, |buffer, _| {
1057                                        let snapshot = buffer.snapshot();
1058                                        let old_position =
1059                                            agent_location.position.to_point(&snapshot);
1060                                        let new_position = location.position.to_point(&snapshot);
1061                                        // ignore this so that when we get updates from the edit tool
1062                                        // the position doesn't reset to the startof line
1063                                        old_position.row == new_position.row
1064                                            && old_position.column > new_position.column
1065                                    })
1066                                    .ok()
1067                                    .unwrap_or_default();
1068                            if !should_ignore {
1069                                project.set_agent_location(Some(location.clone()), cx);
1070                            }
1071                        }
1072                    });
1073                }
1074                if tool_call.resolved_locations != resolved_locations {
1075                    tool_call.resolved_locations = resolved_locations;
1076                    cx.emit(AcpThreadEvent::EntryUpdated(ix));
1077                }
1078            })
1079        })
1080        .detach();
1081    }
1082
1083    pub fn request_tool_call_authorization(
1084        &mut self,
1085        tool_call: acp::ToolCallUpdate,
1086        options: Vec<acp::PermissionOption>,
1087        cx: &mut Context<Self>,
1088    ) -> Result<oneshot::Receiver<acp::PermissionOptionId>, acp::Error> {
1089        let (tx, rx) = oneshot::channel();
1090
1091        let status = ToolCallStatus::WaitingForConfirmation {
1092            options,
1093            respond_tx: tx,
1094        };
1095
1096        self.upsert_tool_call_inner(tool_call, status, cx)?;
1097        cx.emit(AcpThreadEvent::ToolAuthorizationRequired);
1098        Ok(rx)
1099    }
1100
1101    pub fn authorize_tool_call(
1102        &mut self,
1103        id: acp::ToolCallId,
1104        option_id: acp::PermissionOptionId,
1105        option_kind: acp::PermissionOptionKind,
1106        cx: &mut Context<Self>,
1107    ) {
1108        let Some((ix, call)) = self.tool_call_mut(&id) else {
1109            return;
1110        };
1111
1112        let new_status = match option_kind {
1113            acp::PermissionOptionKind::RejectOnce | acp::PermissionOptionKind::RejectAlways => {
1114                ToolCallStatus::Rejected
1115            }
1116            acp::PermissionOptionKind::AllowOnce | acp::PermissionOptionKind::AllowAlways => {
1117                ToolCallStatus::InProgress
1118            }
1119        };
1120
1121        let curr_status = mem::replace(&mut call.status, new_status);
1122
1123        if let ToolCallStatus::WaitingForConfirmation { respond_tx, .. } = curr_status {
1124            respond_tx.send(option_id).log_err();
1125        } else if cfg!(debug_assertions) {
1126            panic!("tried to authorize an already authorized tool call");
1127        }
1128
1129        cx.emit(AcpThreadEvent::EntryUpdated(ix));
1130    }
1131
1132    /// Returns true if the last turn is awaiting tool authorization
1133    pub fn waiting_for_tool_confirmation(&self) -> bool {
1134        for entry in self.entries.iter().rev() {
1135            match &entry {
1136                AgentThreadEntry::ToolCall(call) => match call.status {
1137                    ToolCallStatus::WaitingForConfirmation { .. } => return true,
1138                    ToolCallStatus::Pending
1139                    | ToolCallStatus::InProgress
1140                    | ToolCallStatus::Completed
1141                    | ToolCallStatus::Failed
1142                    | ToolCallStatus::Rejected
1143                    | ToolCallStatus::Canceled => continue,
1144                },
1145                AgentThreadEntry::UserMessage(_) | AgentThreadEntry::AssistantMessage(_) => {
1146                    // Reached the beginning of the turn
1147                    return false;
1148                }
1149            }
1150        }
1151        false
1152    }
1153
1154    pub fn plan(&self) -> &Plan {
1155        &self.plan
1156    }
1157
1158    pub fn update_plan(&mut self, request: acp::Plan, cx: &mut Context<Self>) {
1159        let new_entries_len = request.entries.len();
1160        let mut new_entries = request.entries.into_iter();
1161
1162        // Reuse existing markdown to prevent flickering
1163        for (old, new) in self.plan.entries.iter_mut().zip(new_entries.by_ref()) {
1164            let PlanEntry {
1165                content,
1166                priority,
1167                status,
1168            } = old;
1169            content.update(cx, |old, cx| {
1170                old.replace(new.content, cx);
1171            });
1172            *priority = new.priority;
1173            *status = new.status;
1174        }
1175        for new in new_entries {
1176            self.plan.entries.push(PlanEntry::from_acp(new, cx))
1177        }
1178        self.plan.entries.truncate(new_entries_len);
1179
1180        cx.notify();
1181    }
1182
1183    fn clear_completed_plan_entries(&mut self, cx: &mut Context<Self>) {
1184        self.plan
1185            .entries
1186            .retain(|entry| !matches!(entry.status, acp::PlanEntryStatus::Completed));
1187        cx.notify();
1188    }
1189
1190    #[cfg(any(test, feature = "test-support"))]
1191    pub fn send_raw(
1192        &mut self,
1193        message: &str,
1194        cx: &mut Context<Self>,
1195    ) -> BoxFuture<'static, Result<()>> {
1196        self.send(
1197            vec![acp::ContentBlock::Text(acp::TextContent {
1198                text: message.to_string(),
1199                annotations: None,
1200            })],
1201            cx,
1202        )
1203    }
1204
1205    pub fn send(
1206        &mut self,
1207        message: Vec<acp::ContentBlock>,
1208        cx: &mut Context<Self>,
1209    ) -> BoxFuture<'static, Result<()>> {
1210        let block = ContentBlock::new_combined(
1211            message.clone(),
1212            self.project.read(cx).languages().clone(),
1213            cx,
1214        );
1215        let request = acp::PromptRequest {
1216            prompt: message.clone(),
1217            session_id: self.session_id.clone(),
1218        };
1219        let git_store = self.project.read(cx).git_store().clone();
1220
1221        let message_id = if self
1222            .connection
1223            .session_editor(&self.session_id, cx)
1224            .is_some()
1225        {
1226            Some(UserMessageId::new())
1227        } else {
1228            None
1229        };
1230
1231        self.run_turn(cx, async move |this, cx| {
1232            this.update(cx, |this, cx| {
1233                this.push_entry(
1234                    AgentThreadEntry::UserMessage(UserMessage {
1235                        id: message_id.clone(),
1236                        content: block,
1237                        chunks: message,
1238                        checkpoint: None,
1239                    }),
1240                    cx,
1241                );
1242            })
1243            .ok();
1244
1245            let old_checkpoint = git_store
1246                .update(cx, |git, cx| git.checkpoint(cx))?
1247                .await
1248                .context("failed to get old checkpoint")
1249                .log_err();
1250            this.update(cx, |this, cx| {
1251                if let Some((_ix, message)) = this.last_user_message() {
1252                    message.checkpoint = old_checkpoint.map(|git_checkpoint| Checkpoint {
1253                        git_checkpoint,
1254                        show: false,
1255                    });
1256                }
1257                this.connection.prompt(message_id, request, cx)
1258            })?
1259            .await
1260        })
1261    }
1262
1263    pub fn resume(&mut self, cx: &mut Context<Self>) -> BoxFuture<'static, Result<()>> {
1264        self.run_turn(cx, async move |this, cx| {
1265            this.update(cx, |this, cx| {
1266                this.connection
1267                    .resume(&this.session_id, cx)
1268                    .map(|resume| resume.run(cx))
1269            })?
1270            .context("resuming a session is not supported")?
1271            .await
1272        })
1273    }
1274
1275    fn run_turn(
1276        &mut self,
1277        cx: &mut Context<Self>,
1278        f: impl 'static + AsyncFnOnce(WeakEntity<Self>, &mut AsyncApp) -> Result<acp::PromptResponse>,
1279    ) -> BoxFuture<'static, Result<()>> {
1280        self.clear_completed_plan_entries(cx);
1281
1282        let (tx, rx) = oneshot::channel();
1283        let cancel_task = self.cancel(cx);
1284
1285        self.send_task = Some(cx.spawn(async move |this, cx| {
1286            cancel_task.await;
1287            tx.send(f(this, cx).await).ok();
1288        }));
1289
1290        cx.spawn(async move |this, cx| {
1291            let response = rx.await;
1292
1293            this.update(cx, |this, cx| this.update_last_checkpoint(cx))?
1294                .await?;
1295
1296            this.update(cx, |this, cx| {
1297                match response {
1298                    Ok(Err(e)) => {
1299                        this.send_task.take();
1300                        cx.emit(AcpThreadEvent::Error);
1301                        Err(e)
1302                    }
1303                    result => {
1304                        let canceled = matches!(
1305                            result,
1306                            Ok(Ok(acp::PromptResponse {
1307                                stop_reason: acp::StopReason::Canceled
1308                            }))
1309                        );
1310
1311                        // We only take the task if the current prompt wasn't canceled.
1312                        //
1313                        // This prompt may have been canceled because another one was sent
1314                        // while it was still generating. In these cases, dropping `send_task`
1315                        // would cause the next generation to be canceled.
1316                        if !canceled {
1317                            this.send_task.take();
1318                        }
1319
1320                        cx.emit(AcpThreadEvent::Stopped);
1321                        Ok(())
1322                    }
1323                }
1324            })?
1325        })
1326        .boxed()
1327    }
1328
1329    pub fn cancel(&mut self, cx: &mut Context<Self>) -> Task<()> {
1330        let Some(send_task) = self.send_task.take() else {
1331            return Task::ready(());
1332        };
1333
1334        for entry in self.entries.iter_mut() {
1335            if let AgentThreadEntry::ToolCall(call) = entry {
1336                let cancel = matches!(
1337                    call.status,
1338                    ToolCallStatus::Pending
1339                        | ToolCallStatus::WaitingForConfirmation { .. }
1340                        | ToolCallStatus::InProgress
1341                );
1342
1343                if cancel {
1344                    call.status = ToolCallStatus::Canceled;
1345                }
1346            }
1347        }
1348
1349        self.connection.cancel(&self.session_id, cx);
1350
1351        // Wait for the send task to complete
1352        cx.foreground_executor().spawn(send_task)
1353    }
1354
1355    /// Rewinds this thread to before the entry at `index`, removing it and all
1356    /// subsequent entries while reverting any changes made from that point.
1357    pub fn rewind(&mut self, id: UserMessageId, cx: &mut Context<Self>) -> Task<Result<()>> {
1358        let Some(session_editor) = self.connection.session_editor(&self.session_id, cx) else {
1359            return Task::ready(Err(anyhow!("not supported")));
1360        };
1361        let Some(message) = self.user_message(&id) else {
1362            return Task::ready(Err(anyhow!("message not found")));
1363        };
1364
1365        let checkpoint = message
1366            .checkpoint
1367            .as_ref()
1368            .map(|c| c.git_checkpoint.clone());
1369
1370        let git_store = self.project.read(cx).git_store().clone();
1371        cx.spawn(async move |this, cx| {
1372            if let Some(checkpoint) = checkpoint {
1373                git_store
1374                    .update(cx, |git, cx| git.restore_checkpoint(checkpoint, cx))?
1375                    .await?;
1376            }
1377
1378            cx.update(|cx| session_editor.truncate(id.clone(), cx))?
1379                .await?;
1380            this.update(cx, |this, cx| {
1381                if let Some((ix, _)) = this.user_message_mut(&id) {
1382                    let range = ix..this.entries.len();
1383                    this.entries.truncate(ix);
1384                    cx.emit(AcpThreadEvent::EntriesRemoved(range));
1385                }
1386            })
1387        })
1388    }
1389
1390    fn update_last_checkpoint(&mut self, cx: &mut Context<Self>) -> Task<Result<()>> {
1391        let git_store = self.project.read(cx).git_store().clone();
1392
1393        let old_checkpoint = if let Some((_, message)) = self.last_user_message() {
1394            if let Some(checkpoint) = message.checkpoint.as_ref() {
1395                checkpoint.git_checkpoint.clone()
1396            } else {
1397                return Task::ready(Ok(()));
1398            }
1399        } else {
1400            return Task::ready(Ok(()));
1401        };
1402
1403        let new_checkpoint = git_store.update(cx, |git, cx| git.checkpoint(cx));
1404        cx.spawn(async move |this, cx| {
1405            let new_checkpoint = new_checkpoint
1406                .await
1407                .context("failed to get new checkpoint")
1408                .log_err();
1409            if let Some(new_checkpoint) = new_checkpoint {
1410                let equal = git_store
1411                    .update(cx, |git, cx| {
1412                        git.compare_checkpoints(old_checkpoint.clone(), new_checkpoint, cx)
1413                    })?
1414                    .await
1415                    .unwrap_or(true);
1416                this.update(cx, |this, cx| {
1417                    let (ix, message) = this.last_user_message().context("no user message")?;
1418                    let checkpoint = message.checkpoint.as_mut().context("no checkpoint")?;
1419                    checkpoint.show = !equal;
1420                    cx.emit(AcpThreadEvent::EntryUpdated(ix));
1421                    anyhow::Ok(())
1422                })??;
1423            }
1424
1425            Ok(())
1426        })
1427    }
1428
1429    fn last_user_message(&mut self) -> Option<(usize, &mut UserMessage)> {
1430        self.entries
1431            .iter_mut()
1432            .enumerate()
1433            .rev()
1434            .find_map(|(ix, entry)| {
1435                if let AgentThreadEntry::UserMessage(message) = entry {
1436                    Some((ix, message))
1437                } else {
1438                    None
1439                }
1440            })
1441    }
1442
1443    fn user_message(&self, id: &UserMessageId) -> Option<&UserMessage> {
1444        self.entries.iter().find_map(|entry| {
1445            if let AgentThreadEntry::UserMessage(message) = entry {
1446                if message.id.as_ref() == Some(&id) {
1447                    Some(message)
1448                } else {
1449                    None
1450                }
1451            } else {
1452                None
1453            }
1454        })
1455    }
1456
1457    fn user_message_mut(&mut self, id: &UserMessageId) -> Option<(usize, &mut UserMessage)> {
1458        self.entries.iter_mut().enumerate().find_map(|(ix, entry)| {
1459            if let AgentThreadEntry::UserMessage(message) = entry {
1460                if message.id.as_ref() == Some(&id) {
1461                    Some((ix, message))
1462                } else {
1463                    None
1464                }
1465            } else {
1466                None
1467            }
1468        })
1469    }
1470
1471    pub fn read_text_file(
1472        &self,
1473        path: PathBuf,
1474        line: Option<u32>,
1475        limit: Option<u32>,
1476        reuse_shared_snapshot: bool,
1477        cx: &mut Context<Self>,
1478    ) -> Task<Result<String>> {
1479        let project = self.project.clone();
1480        let action_log = self.action_log.clone();
1481        cx.spawn(async move |this, cx| {
1482            let load = project.update(cx, |project, cx| {
1483                let path = project
1484                    .project_path_for_absolute_path(&path, cx)
1485                    .context("invalid path")?;
1486                anyhow::Ok(project.open_buffer(path, cx))
1487            });
1488            let buffer = load??.await?;
1489
1490            let snapshot = if reuse_shared_snapshot {
1491                this.read_with(cx, |this, _| {
1492                    this.shared_buffers.get(&buffer.clone()).cloned()
1493                })
1494                .log_err()
1495                .flatten()
1496            } else {
1497                None
1498            };
1499
1500            let snapshot = if let Some(snapshot) = snapshot {
1501                snapshot
1502            } else {
1503                action_log.update(cx, |action_log, cx| {
1504                    action_log.buffer_read(buffer.clone(), cx);
1505                })?;
1506                project.update(cx, |project, cx| {
1507                    let position = buffer
1508                        .read(cx)
1509                        .snapshot()
1510                        .anchor_before(Point::new(line.unwrap_or_default(), 0));
1511                    project.set_agent_location(
1512                        Some(AgentLocation {
1513                            buffer: buffer.downgrade(),
1514                            position,
1515                        }),
1516                        cx,
1517                    );
1518                })?;
1519
1520                buffer.update(cx, |buffer, _| buffer.snapshot())?
1521            };
1522
1523            this.update(cx, |this, _| {
1524                let text = snapshot.text();
1525                this.shared_buffers.insert(buffer.clone(), snapshot);
1526                if line.is_none() && limit.is_none() {
1527                    return Ok(text);
1528                }
1529                let limit = limit.unwrap_or(u32::MAX) as usize;
1530                let Some(line) = line else {
1531                    return Ok(text.lines().take(limit).collect::<String>());
1532                };
1533
1534                let count = text.lines().count();
1535                if count < line as usize {
1536                    anyhow::bail!("There are only {} lines", count);
1537                }
1538                Ok(text
1539                    .lines()
1540                    .skip(line as usize + 1)
1541                    .take(limit)
1542                    .collect::<String>())
1543            })?
1544        })
1545    }
1546
1547    pub fn write_text_file(
1548        &self,
1549        path: PathBuf,
1550        content: String,
1551        cx: &mut Context<Self>,
1552    ) -> Task<Result<()>> {
1553        let project = self.project.clone();
1554        let action_log = self.action_log.clone();
1555        cx.spawn(async move |this, cx| {
1556            let load = project.update(cx, |project, cx| {
1557                let path = project
1558                    .project_path_for_absolute_path(&path, cx)
1559                    .context("invalid path")?;
1560                anyhow::Ok(project.open_buffer(path, cx))
1561            });
1562            let buffer = load??.await?;
1563            let snapshot = this.update(cx, |this, cx| {
1564                this.shared_buffers
1565                    .get(&buffer)
1566                    .cloned()
1567                    .unwrap_or_else(|| buffer.read(cx).snapshot())
1568            })?;
1569            let edits = cx
1570                .background_executor()
1571                .spawn(async move {
1572                    let old_text = snapshot.text();
1573                    text_diff(old_text.as_str(), &content)
1574                        .into_iter()
1575                        .map(|(range, replacement)| {
1576                            (
1577                                snapshot.anchor_after(range.start)
1578                                    ..snapshot.anchor_before(range.end),
1579                                replacement,
1580                            )
1581                        })
1582                        .collect::<Vec<_>>()
1583                })
1584                .await;
1585            cx.update(|cx| {
1586                project.update(cx, |project, cx| {
1587                    project.set_agent_location(
1588                        Some(AgentLocation {
1589                            buffer: buffer.downgrade(),
1590                            position: edits
1591                                .last()
1592                                .map(|(range, _)| range.end)
1593                                .unwrap_or(Anchor::MIN),
1594                        }),
1595                        cx,
1596                    );
1597                });
1598
1599                action_log.update(cx, |action_log, cx| {
1600                    action_log.buffer_read(buffer.clone(), cx);
1601                });
1602                buffer.update(cx, |buffer, cx| {
1603                    buffer.edit(edits, None, cx);
1604                });
1605                action_log.update(cx, |action_log, cx| {
1606                    action_log.buffer_edited(buffer.clone(), cx);
1607                });
1608            })?;
1609            project
1610                .update(cx, |project, cx| project.save_buffer(buffer, cx))?
1611                .await
1612        })
1613    }
1614
1615    pub fn to_markdown(&self, cx: &App) -> String {
1616        self.entries.iter().map(|e| e.to_markdown(cx)).collect()
1617    }
1618
1619    pub fn emit_server_exited(&mut self, status: ExitStatus, cx: &mut Context<Self>) {
1620        cx.emit(AcpThreadEvent::ServerExited(status));
1621    }
1622}
1623
1624fn markdown_for_raw_output(
1625    raw_output: &serde_json::Value,
1626    language_registry: &Arc<LanguageRegistry>,
1627    cx: &mut App,
1628) -> Option<Entity<Markdown>> {
1629    match raw_output {
1630        serde_json::Value::Null => None,
1631        serde_json::Value::Bool(value) => Some(cx.new(|cx| {
1632            Markdown::new(
1633                value.to_string().into(),
1634                Some(language_registry.clone()),
1635                None,
1636                cx,
1637            )
1638        })),
1639        serde_json::Value::Number(value) => Some(cx.new(|cx| {
1640            Markdown::new(
1641                value.to_string().into(),
1642                Some(language_registry.clone()),
1643                None,
1644                cx,
1645            )
1646        })),
1647        serde_json::Value::String(value) => Some(cx.new(|cx| {
1648            Markdown::new(
1649                value.clone().into(),
1650                Some(language_registry.clone()),
1651                None,
1652                cx,
1653            )
1654        })),
1655        value => Some(cx.new(|cx| {
1656            Markdown::new(
1657                format!("```json\n{}\n```", value).into(),
1658                Some(language_registry.clone()),
1659                None,
1660                cx,
1661            )
1662        })),
1663    }
1664}
1665
1666#[cfg(test)]
1667mod tests {
1668    use super::*;
1669    use anyhow::anyhow;
1670    use futures::{channel::mpsc, future::LocalBoxFuture, select};
1671    use gpui::{App, AsyncApp, TestAppContext, WeakEntity};
1672    use indoc::indoc;
1673    use project::{FakeFs, Fs};
1674    use rand::Rng as _;
1675    use serde_json::json;
1676    use settings::SettingsStore;
1677    use smol::stream::StreamExt as _;
1678    use std::{
1679        any::Any,
1680        cell::RefCell,
1681        path::Path,
1682        rc::Rc,
1683        sync::atomic::{AtomicBool, AtomicUsize, Ordering::SeqCst},
1684        time::Duration,
1685    };
1686    use util::path;
1687
1688    fn init_test(cx: &mut TestAppContext) {
1689        env_logger::try_init().ok();
1690        cx.update(|cx| {
1691            let settings_store = SettingsStore::test(cx);
1692            cx.set_global(settings_store);
1693            Project::init_settings(cx);
1694            language::init(cx);
1695        });
1696    }
1697
1698    #[gpui::test]
1699    async fn test_push_user_content_block(cx: &mut gpui::TestAppContext) {
1700        init_test(cx);
1701
1702        let fs = FakeFs::new(cx.executor());
1703        let project = Project::test(fs, [], cx).await;
1704        let connection = Rc::new(FakeAgentConnection::new());
1705        let thread = cx
1706            .update(|cx| connection.new_thread(project, Path::new(path!("/test")), cx))
1707            .await
1708            .unwrap();
1709
1710        // Test creating a new user message
1711        thread.update(cx, |thread, cx| {
1712            thread.push_user_content_block(
1713                None,
1714                acp::ContentBlock::Text(acp::TextContent {
1715                    annotations: None,
1716                    text: "Hello, ".to_string(),
1717                }),
1718                cx,
1719            );
1720        });
1721
1722        thread.update(cx, |thread, cx| {
1723            assert_eq!(thread.entries.len(), 1);
1724            if let AgentThreadEntry::UserMessage(user_msg) = &thread.entries[0] {
1725                assert_eq!(user_msg.id, None);
1726                assert_eq!(user_msg.content.to_markdown(cx), "Hello, ");
1727            } else {
1728                panic!("Expected UserMessage");
1729            }
1730        });
1731
1732        // Test appending to existing user message
1733        let message_1_id = UserMessageId::new();
1734        thread.update(cx, |thread, cx| {
1735            thread.push_user_content_block(
1736                Some(message_1_id.clone()),
1737                acp::ContentBlock::Text(acp::TextContent {
1738                    annotations: None,
1739                    text: "world!".to_string(),
1740                }),
1741                cx,
1742            );
1743        });
1744
1745        thread.update(cx, |thread, cx| {
1746            assert_eq!(thread.entries.len(), 1);
1747            if let AgentThreadEntry::UserMessage(user_msg) = &thread.entries[0] {
1748                assert_eq!(user_msg.id, Some(message_1_id));
1749                assert_eq!(user_msg.content.to_markdown(cx), "Hello, world!");
1750            } else {
1751                panic!("Expected UserMessage");
1752            }
1753        });
1754
1755        // Test creating new user message after assistant message
1756        thread.update(cx, |thread, cx| {
1757            thread.push_assistant_content_block(
1758                acp::ContentBlock::Text(acp::TextContent {
1759                    annotations: None,
1760                    text: "Assistant response".to_string(),
1761                }),
1762                false,
1763                cx,
1764            );
1765        });
1766
1767        let message_2_id = UserMessageId::new();
1768        thread.update(cx, |thread, cx| {
1769            thread.push_user_content_block(
1770                Some(message_2_id.clone()),
1771                acp::ContentBlock::Text(acp::TextContent {
1772                    annotations: None,
1773                    text: "New user message".to_string(),
1774                }),
1775                cx,
1776            );
1777        });
1778
1779        thread.update(cx, |thread, cx| {
1780            assert_eq!(thread.entries.len(), 3);
1781            if let AgentThreadEntry::UserMessage(user_msg) = &thread.entries[2] {
1782                assert_eq!(user_msg.id, Some(message_2_id));
1783                assert_eq!(user_msg.content.to_markdown(cx), "New user message");
1784            } else {
1785                panic!("Expected UserMessage at index 2");
1786            }
1787        });
1788    }
1789
1790    #[gpui::test]
1791    async fn test_thinking_concatenation(cx: &mut gpui::TestAppContext) {
1792        init_test(cx);
1793
1794        let fs = FakeFs::new(cx.executor());
1795        let project = Project::test(fs, [], cx).await;
1796        let connection = Rc::new(FakeAgentConnection::new().on_user_message(
1797            |_, thread, mut cx| {
1798                async move {
1799                    thread.update(&mut cx, |thread, cx| {
1800                        thread
1801                            .handle_session_update(
1802                                acp::SessionUpdate::AgentThoughtChunk {
1803                                    content: "Thinking ".into(),
1804                                },
1805                                cx,
1806                            )
1807                            .unwrap();
1808                        thread
1809                            .handle_session_update(
1810                                acp::SessionUpdate::AgentThoughtChunk {
1811                                    content: "hard!".into(),
1812                                },
1813                                cx,
1814                            )
1815                            .unwrap();
1816                    })?;
1817                    Ok(acp::PromptResponse {
1818                        stop_reason: acp::StopReason::EndTurn,
1819                    })
1820                }
1821                .boxed_local()
1822            },
1823        ));
1824
1825        let thread = cx
1826            .update(|cx| connection.new_thread(project, Path::new(path!("/test")), cx))
1827            .await
1828            .unwrap();
1829
1830        thread
1831            .update(cx, |thread, cx| thread.send_raw("Hello from Zed!", cx))
1832            .await
1833            .unwrap();
1834
1835        let output = thread.read_with(cx, |thread, cx| thread.to_markdown(cx));
1836        assert_eq!(
1837            output,
1838            indoc! {r#"
1839            ## User
1840
1841            Hello from Zed!
1842
1843            ## Assistant
1844
1845            <thinking>
1846            Thinking hard!
1847            </thinking>
1848
1849            "#}
1850        );
1851    }
1852
1853    #[gpui::test]
1854    async fn test_edits_concurrently_to_user(cx: &mut TestAppContext) {
1855        init_test(cx);
1856
1857        let fs = FakeFs::new(cx.executor());
1858        fs.insert_tree(path!("/tmp"), json!({"foo": "one\ntwo\nthree\n"}))
1859            .await;
1860        let project = Project::test(fs.clone(), [], cx).await;
1861        let (read_file_tx, read_file_rx) = oneshot::channel::<()>();
1862        let read_file_tx = Rc::new(RefCell::new(Some(read_file_tx)));
1863        let connection = Rc::new(FakeAgentConnection::new().on_user_message(
1864            move |_, thread, mut cx| {
1865                let read_file_tx = read_file_tx.clone();
1866                async move {
1867                    let content = thread
1868                        .update(&mut cx, |thread, cx| {
1869                            thread.read_text_file(path!("/tmp/foo").into(), None, None, false, cx)
1870                        })
1871                        .unwrap()
1872                        .await
1873                        .unwrap();
1874                    assert_eq!(content, "one\ntwo\nthree\n");
1875                    read_file_tx.take().unwrap().send(()).unwrap();
1876                    thread
1877                        .update(&mut cx, |thread, cx| {
1878                            thread.write_text_file(
1879                                path!("/tmp/foo").into(),
1880                                "one\ntwo\nthree\nfour\nfive\n".to_string(),
1881                                cx,
1882                            )
1883                        })
1884                        .unwrap()
1885                        .await
1886                        .unwrap();
1887                    Ok(acp::PromptResponse {
1888                        stop_reason: acp::StopReason::EndTurn,
1889                    })
1890                }
1891                .boxed_local()
1892            },
1893        ));
1894
1895        let (worktree, pathbuf) = project
1896            .update(cx, |project, cx| {
1897                project.find_or_create_worktree(path!("/tmp/foo"), true, cx)
1898            })
1899            .await
1900            .unwrap();
1901        let buffer = project
1902            .update(cx, |project, cx| {
1903                project.open_buffer((worktree.read(cx).id(), pathbuf), cx)
1904            })
1905            .await
1906            .unwrap();
1907
1908        let thread = cx
1909            .update(|cx| connection.new_thread(project, Path::new(path!("/tmp")), cx))
1910            .await
1911            .unwrap();
1912
1913        let request = thread.update(cx, |thread, cx| {
1914            thread.send_raw("Extend the count in /tmp/foo", cx)
1915        });
1916        read_file_rx.await.ok();
1917        buffer.update(cx, |buffer, cx| {
1918            buffer.edit([(0..0, "zero\n".to_string())], None, cx);
1919        });
1920        cx.run_until_parked();
1921        assert_eq!(
1922            buffer.read_with(cx, |buffer, _| buffer.text()),
1923            "zero\none\ntwo\nthree\nfour\nfive\n"
1924        );
1925        assert_eq!(
1926            String::from_utf8(fs.read_file_sync(path!("/tmp/foo")).unwrap()).unwrap(),
1927            "zero\none\ntwo\nthree\nfour\nfive\n"
1928        );
1929        request.await.unwrap();
1930    }
1931
1932    #[gpui::test]
1933    async fn test_succeeding_canceled_toolcall(cx: &mut TestAppContext) {
1934        init_test(cx);
1935
1936        let fs = FakeFs::new(cx.executor());
1937        let project = Project::test(fs, [], cx).await;
1938        let id = acp::ToolCallId("test".into());
1939
1940        let connection = Rc::new(FakeAgentConnection::new().on_user_message({
1941            let id = id.clone();
1942            move |_, thread, mut cx| {
1943                let id = id.clone();
1944                async move {
1945                    thread
1946                        .update(&mut cx, |thread, cx| {
1947                            thread.handle_session_update(
1948                                acp::SessionUpdate::ToolCall(acp::ToolCall {
1949                                    id: id.clone(),
1950                                    title: "Label".into(),
1951                                    kind: acp::ToolKind::Fetch,
1952                                    status: acp::ToolCallStatus::InProgress,
1953                                    content: vec![],
1954                                    locations: vec![],
1955                                    raw_input: None,
1956                                    raw_output: None,
1957                                }),
1958                                cx,
1959                            )
1960                        })
1961                        .unwrap()
1962                        .unwrap();
1963                    Ok(acp::PromptResponse {
1964                        stop_reason: acp::StopReason::EndTurn,
1965                    })
1966                }
1967                .boxed_local()
1968            }
1969        }));
1970
1971        let thread = cx
1972            .update(|cx| connection.new_thread(project, Path::new(path!("/test")), cx))
1973            .await
1974            .unwrap();
1975
1976        let request = thread.update(cx, |thread, cx| {
1977            thread.send_raw("Fetch https://example.com", cx)
1978        });
1979
1980        run_until_first_tool_call(&thread, cx).await;
1981
1982        thread.read_with(cx, |thread, _| {
1983            assert!(matches!(
1984                thread.entries[1],
1985                AgentThreadEntry::ToolCall(ToolCall {
1986                    status: ToolCallStatus::InProgress,
1987                    ..
1988                })
1989            ));
1990        });
1991
1992        thread.update(cx, |thread, cx| thread.cancel(cx)).await;
1993
1994        thread.read_with(cx, |thread, _| {
1995            assert!(matches!(
1996                &thread.entries[1],
1997                AgentThreadEntry::ToolCall(ToolCall {
1998                    status: ToolCallStatus::Canceled,
1999                    ..
2000                })
2001            ));
2002        });
2003
2004        thread
2005            .update(cx, |thread, cx| {
2006                thread.handle_session_update(
2007                    acp::SessionUpdate::ToolCallUpdate(acp::ToolCallUpdate {
2008                        id,
2009                        fields: acp::ToolCallUpdateFields {
2010                            status: Some(acp::ToolCallStatus::Completed),
2011                            ..Default::default()
2012                        },
2013                    }),
2014                    cx,
2015                )
2016            })
2017            .unwrap();
2018
2019        request.await.unwrap();
2020
2021        thread.read_with(cx, |thread, _| {
2022            assert!(matches!(
2023                thread.entries[1],
2024                AgentThreadEntry::ToolCall(ToolCall {
2025                    status: ToolCallStatus::Completed,
2026                    ..
2027                })
2028            ));
2029        });
2030    }
2031
2032    #[gpui::test]
2033    async fn test_no_pending_edits_if_tool_calls_are_completed(cx: &mut TestAppContext) {
2034        init_test(cx);
2035        let fs = FakeFs::new(cx.background_executor.clone());
2036        fs.insert_tree(path!("/test"), json!({})).await;
2037        let project = Project::test(fs, [path!("/test").as_ref()], cx).await;
2038
2039        let connection = Rc::new(FakeAgentConnection::new().on_user_message({
2040            move |_, thread, mut cx| {
2041                async move {
2042                    thread
2043                        .update(&mut cx, |thread, cx| {
2044                            thread.handle_session_update(
2045                                acp::SessionUpdate::ToolCall(acp::ToolCall {
2046                                    id: acp::ToolCallId("test".into()),
2047                                    title: "Label".into(),
2048                                    kind: acp::ToolKind::Edit,
2049                                    status: acp::ToolCallStatus::Completed,
2050                                    content: vec![acp::ToolCallContent::Diff {
2051                                        diff: acp::Diff {
2052                                            path: "/test/test.txt".into(),
2053                                            old_text: None,
2054                                            new_text: "foo".into(),
2055                                        },
2056                                    }],
2057                                    locations: vec![],
2058                                    raw_input: None,
2059                                    raw_output: None,
2060                                }),
2061                                cx,
2062                            )
2063                        })
2064                        .unwrap()
2065                        .unwrap();
2066                    Ok(acp::PromptResponse {
2067                        stop_reason: acp::StopReason::EndTurn,
2068                    })
2069                }
2070                .boxed_local()
2071            }
2072        }));
2073
2074        let thread = cx
2075            .update(|cx| connection.new_thread(project, Path::new(path!("/test")), cx))
2076            .await
2077            .unwrap();
2078
2079        cx.update(|cx| thread.update(cx, |thread, cx| thread.send(vec!["Hi".into()], cx)))
2080            .await
2081            .unwrap();
2082
2083        assert!(cx.read(|cx| !thread.read(cx).has_pending_edit_tool_calls()));
2084    }
2085
2086    #[gpui::test(iterations = 10)]
2087    async fn test_checkpoints(cx: &mut TestAppContext) {
2088        init_test(cx);
2089        let fs = FakeFs::new(cx.background_executor.clone());
2090        fs.insert_tree(
2091            path!("/test"),
2092            json!({
2093                ".git": {}
2094            }),
2095        )
2096        .await;
2097        let project = Project::test(fs.clone(), [path!("/test").as_ref()], cx).await;
2098
2099        let simulate_changes = Arc::new(AtomicBool::new(true));
2100        let next_filename = Arc::new(AtomicUsize::new(0));
2101        let connection = Rc::new(FakeAgentConnection::new().on_user_message({
2102            let simulate_changes = simulate_changes.clone();
2103            let next_filename = next_filename.clone();
2104            let fs = fs.clone();
2105            move |request, thread, mut cx| {
2106                let fs = fs.clone();
2107                let simulate_changes = simulate_changes.clone();
2108                let next_filename = next_filename.clone();
2109                async move {
2110                    if simulate_changes.load(SeqCst) {
2111                        let filename = format!("/test/file-{}", next_filename.fetch_add(1, SeqCst));
2112                        fs.write(Path::new(&filename), b"").await?;
2113                    }
2114
2115                    let acp::ContentBlock::Text(content) = &request.prompt[0] else {
2116                        panic!("expected text content block");
2117                    };
2118                    thread.update(&mut cx, |thread, cx| {
2119                        thread
2120                            .handle_session_update(
2121                                acp::SessionUpdate::AgentMessageChunk {
2122                                    content: content.text.to_uppercase().into(),
2123                                },
2124                                cx,
2125                            )
2126                            .unwrap();
2127                    })?;
2128                    Ok(acp::PromptResponse {
2129                        stop_reason: acp::StopReason::EndTurn,
2130                    })
2131                }
2132                .boxed_local()
2133            }
2134        }));
2135        let thread = cx
2136            .update(|cx| connection.new_thread(project, Path::new(path!("/test")), cx))
2137            .await
2138            .unwrap();
2139
2140        cx.update(|cx| thread.update(cx, |thread, cx| thread.send(vec!["Lorem".into()], cx)))
2141            .await
2142            .unwrap();
2143        thread.read_with(cx, |thread, cx| {
2144            assert_eq!(
2145                thread.to_markdown(cx),
2146                indoc! {"
2147                    ## User (checkpoint)
2148
2149                    Lorem
2150
2151                    ## Assistant
2152
2153                    LOREM
2154
2155                "}
2156            );
2157        });
2158        assert_eq!(fs.files(), vec![Path::new("/test/file-0")]);
2159
2160        cx.update(|cx| thread.update(cx, |thread, cx| thread.send(vec!["ipsum".into()], cx)))
2161            .await
2162            .unwrap();
2163        thread.read_with(cx, |thread, cx| {
2164            assert_eq!(
2165                thread.to_markdown(cx),
2166                indoc! {"
2167                    ## User (checkpoint)
2168
2169                    Lorem
2170
2171                    ## Assistant
2172
2173                    LOREM
2174
2175                    ## User (checkpoint)
2176
2177                    ipsum
2178
2179                    ## Assistant
2180
2181                    IPSUM
2182
2183                "}
2184            );
2185        });
2186        assert_eq!(
2187            fs.files(),
2188            vec![Path::new("/test/file-0"), Path::new("/test/file-1")]
2189        );
2190
2191        // Checkpoint isn't stored when there are no changes.
2192        simulate_changes.store(false, SeqCst);
2193        cx.update(|cx| thread.update(cx, |thread, cx| thread.send(vec!["dolor".into()], cx)))
2194            .await
2195            .unwrap();
2196        thread.read_with(cx, |thread, cx| {
2197            assert_eq!(
2198                thread.to_markdown(cx),
2199                indoc! {"
2200                    ## User (checkpoint)
2201
2202                    Lorem
2203
2204                    ## Assistant
2205
2206                    LOREM
2207
2208                    ## User (checkpoint)
2209
2210                    ipsum
2211
2212                    ## Assistant
2213
2214                    IPSUM
2215
2216                    ## User
2217
2218                    dolor
2219
2220                    ## Assistant
2221
2222                    DOLOR
2223
2224                "}
2225            );
2226        });
2227        assert_eq!(
2228            fs.files(),
2229            vec![Path::new("/test/file-0"), Path::new("/test/file-1")]
2230        );
2231
2232        // Rewinding the conversation truncates the history and restores the checkpoint.
2233        thread
2234            .update(cx, |thread, cx| {
2235                let AgentThreadEntry::UserMessage(message) = &thread.entries[2] else {
2236                    panic!("unexpected entries {:?}", thread.entries)
2237                };
2238                thread.rewind(message.id.clone().unwrap(), cx)
2239            })
2240            .await
2241            .unwrap();
2242        thread.read_with(cx, |thread, cx| {
2243            assert_eq!(
2244                thread.to_markdown(cx),
2245                indoc! {"
2246                    ## User (checkpoint)
2247
2248                    Lorem
2249
2250                    ## Assistant
2251
2252                    LOREM
2253
2254                "}
2255            );
2256        });
2257        assert_eq!(fs.files(), vec![Path::new("/test/file-0")]);
2258    }
2259
2260    async fn run_until_first_tool_call(
2261        thread: &Entity<AcpThread>,
2262        cx: &mut TestAppContext,
2263    ) -> usize {
2264        let (mut tx, mut rx) = mpsc::channel::<usize>(1);
2265
2266        let subscription = cx.update(|cx| {
2267            cx.subscribe(thread, move |thread, _, cx| {
2268                for (ix, entry) in thread.read(cx).entries.iter().enumerate() {
2269                    if matches!(entry, AgentThreadEntry::ToolCall(_)) {
2270                        return tx.try_send(ix).unwrap();
2271                    }
2272                }
2273            })
2274        });
2275
2276        select! {
2277            _ = futures::FutureExt::fuse(smol::Timer::after(Duration::from_secs(10))) => {
2278                panic!("Timeout waiting for tool call")
2279            }
2280            ix = rx.next().fuse() => {
2281                drop(subscription);
2282                ix.unwrap()
2283            }
2284        }
2285    }
2286
2287    #[derive(Clone, Default)]
2288    struct FakeAgentConnection {
2289        auth_methods: Vec<acp::AuthMethod>,
2290        sessions: Arc<parking_lot::Mutex<HashMap<acp::SessionId, WeakEntity<AcpThread>>>>,
2291        on_user_message: Option<
2292            Rc<
2293                dyn Fn(
2294                        acp::PromptRequest,
2295                        WeakEntity<AcpThread>,
2296                        AsyncApp,
2297                    ) -> LocalBoxFuture<'static, Result<acp::PromptResponse>>
2298                    + 'static,
2299            >,
2300        >,
2301    }
2302
2303    impl FakeAgentConnection {
2304        fn new() -> Self {
2305            Self {
2306                auth_methods: Vec::new(),
2307                on_user_message: None,
2308                sessions: Arc::default(),
2309            }
2310        }
2311
2312        #[expect(unused)]
2313        fn with_auth_methods(mut self, auth_methods: Vec<acp::AuthMethod>) -> Self {
2314            self.auth_methods = auth_methods;
2315            self
2316        }
2317
2318        fn on_user_message(
2319            mut self,
2320            handler: impl Fn(
2321                acp::PromptRequest,
2322                WeakEntity<AcpThread>,
2323                AsyncApp,
2324            ) -> LocalBoxFuture<'static, Result<acp::PromptResponse>>
2325            + 'static,
2326        ) -> Self {
2327            self.on_user_message.replace(Rc::new(handler));
2328            self
2329        }
2330    }
2331
2332    impl AgentConnection for FakeAgentConnection {
2333        fn auth_methods(&self) -> &[acp::AuthMethod] {
2334            &self.auth_methods
2335        }
2336
2337        fn new_thread(
2338            self: Rc<Self>,
2339            project: Entity<Project>,
2340            _cwd: &Path,
2341            cx: &mut App,
2342        ) -> Task<gpui::Result<Entity<AcpThread>>> {
2343            let session_id = acp::SessionId(
2344                rand::thread_rng()
2345                    .sample_iter(&rand::distributions::Alphanumeric)
2346                    .take(7)
2347                    .map(char::from)
2348                    .collect::<String>()
2349                    .into(),
2350            );
2351            let thread =
2352                cx.new(|cx| AcpThread::new("Test", self.clone(), project, session_id.clone(), cx));
2353            self.sessions.lock().insert(session_id, thread.downgrade());
2354            Task::ready(Ok(thread))
2355        }
2356
2357        fn authenticate(&self, method: acp::AuthMethodId, _cx: &mut App) -> Task<gpui::Result<()>> {
2358            if self.auth_methods().iter().any(|m| m.id == method) {
2359                Task::ready(Ok(()))
2360            } else {
2361                Task::ready(Err(anyhow!("Invalid Auth Method")))
2362            }
2363        }
2364
2365        fn prompt(
2366            &self,
2367            _id: Option<UserMessageId>,
2368            params: acp::PromptRequest,
2369            cx: &mut App,
2370        ) -> Task<gpui::Result<acp::PromptResponse>> {
2371            let sessions = self.sessions.lock();
2372            let thread = sessions.get(&params.session_id).unwrap();
2373            if let Some(handler) = &self.on_user_message {
2374                let handler = handler.clone();
2375                let thread = thread.clone();
2376                cx.spawn(async move |cx| handler(params, thread, cx.clone()).await)
2377            } else {
2378                Task::ready(Ok(acp::PromptResponse {
2379                    stop_reason: acp::StopReason::EndTurn,
2380                }))
2381            }
2382        }
2383
2384        fn cancel(&self, session_id: &acp::SessionId, cx: &mut App) {
2385            let sessions = self.sessions.lock();
2386            let thread = sessions.get(&session_id).unwrap().clone();
2387
2388            cx.spawn(async move |cx| {
2389                thread
2390                    .update(cx, |thread, cx| thread.cancel(cx))
2391                    .unwrap()
2392                    .await
2393            })
2394            .detach();
2395        }
2396
2397        fn session_editor(
2398            &self,
2399            session_id: &acp::SessionId,
2400            _cx: &mut App,
2401        ) -> Option<Rc<dyn AgentSessionEditor>> {
2402            Some(Rc::new(FakeAgentSessionEditor {
2403                _session_id: session_id.clone(),
2404            }))
2405        }
2406
2407        fn into_any(self: Rc<Self>) -> Rc<dyn Any> {
2408            self
2409        }
2410    }
2411
2412    struct FakeAgentSessionEditor {
2413        _session_id: acp::SessionId,
2414    }
2415
2416    impl AgentSessionEditor for FakeAgentSessionEditor {
2417        fn truncate(&self, _message_id: UserMessageId, _cx: &mut App) -> Task<Result<()>> {
2418            Task::ready(Ok(()))
2419        }
2420    }
2421}