//! One chat thread: owns the background agent process (Claude Code or Pi) and
//! folds its event stream into a list of renderable chat items.
use std::{
collections::{HashMap, HashSet, VecDeque},
path::{Path, PathBuf},
sync::atomic::{AtomicU64, Ordering},
time::{Duration, Instant, SystemTime, UNIX_EPOCH},
};
use base64::{Engine as _, engine::general_purpose::STANDARD as BASE64};
use gpui_kit::component::text::TextViewState;
use gpui_kit::*;
use serde::{Deserialize, Serialize};
use serde_json::{Value, json};
use crate::browser;
use crate::claude::{AgentProcess, Effort, LaunchConfig, PermissionMode, ProcessEvent};
use crate::git::{self, TurnChanges};
use crate::models::{Catalog, Provider};
use crate::settings::{self, Streaming};
use crate::worktree::{self, PullRequest, Worktree, WorktreePlan};
const DEFAULT_TITLE: &str = "New thread";
const STDERR_TAIL: usize = 20;
/// The API's limit for one base64 image.
const MAX_IMAGE_BYTES: u64 = 5 * 1024 * 1024;
static NEXT_SESSION: AtomicU64 = AtomicU64::new(1);
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum SessionStatus {
Starting,
Idle,
Working,
Exited,
}
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum ToolState {
Running,
Done,
Error,
}
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum PermissionState {
Pending,
Allowed,
Denied,
Cancelled,
}
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum PermissionDecision {
Allow,
AllowAlways,
Deny,
}
pub struct PermissionPrompt {
pub request_id: String,
pub input: Value,
pub suggestions: Vec<Value>,
pub state: PermissionState,
}
impl PermissionPrompt {
/// Label for the "remember this" button, if the CLI offered a rule to save.
pub fn always_label(&self) -> Option<&'static str> {
self.suggestions.iter().find_map(|suggestion| {
match suggestion.get("type").and_then(Value::as_str)? {
"setMode" if suggestion.get("mode").and_then(Value::as_str) == Some("acceptEdits") => {
Some("Accept all edits")
}
"addRules" | "replaceRules" => Some("Always allow"),
_ => None,
}
})
}
}
pub struct ToolCall {
pub id: String,
pub name: String,
pub input: Value,
pub partial_input: String,
pub result: Option<String>,
pub state: ToolState,
pub permission: Option<PermissionPrompt>,
pub expanded: bool,
/// Tool calls made by a subagent running inside this (Task) tool.
pub subagent_tool_count: usize,
/// Created from a permission request for a tool we never saw being called
/// (subagent tools), so no result will ever arrive for it.
pub detached: bool,
}
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum NoticeKind {
Info,
Error,
}
/// A question an agent extension put to the user (Pi's extension UI).
pub struct Question {
pub request_id: String,
pub title: SharedString,
pub message: Option<SharedString>,
pub options: Vec<SharedString>,
/// A yes/no confirmation rather than a pick from a list.
pub confirm: bool,
pub answer: Option<SharedString>,
}
/// An answer as the agent wrote it, and the Markdown view showing it. While
/// streaming, the view may lag behind the text to show only finished
/// paragraphs.
pub struct AssistantText {
pub text: String,
pub view: Entity<TextViewState>,
/// How much of `text` the view shows.
shown: usize,
}
pub enum ChatItem {
User {
text: SharedString,
/// File names of what was attached.
attachments: Vec<SharedString>,
at: SystemTime,
},
Assistant(AssistantText),
Tool(ToolCall),
Notice(NoticeKind, SharedString),
Question(Question),
TurnEnd { duration_ms: u64, cost: Option<f64>, at: SystemTime },
}
/// What a session tells the views around it.
pub enum SessionEvent {
/// A finished turn's changes on disk are known, by its `TurnEnd` index.
TurnChanges(usize),
}
/// A message waiting for the running turn to end.
#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
pub struct QueuedMessage {
pub text: String,
pub attachments: Vec<PathBuf>,
}
/// How hard the model reasons, as picked in the composer.
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
pub enum Reasoning {
/// Whatever the model or agent defaults to.
#[default]
Default,
Level(Effort),
/// Claude only: extra-high effort plus multi-agent workflow orchestration.
Ultracode,
/// Claude only: asks for deeper reasoning on every message.
Ultrathink,
}
impl Reasoning {
pub fn label(self) -> &'static str {
match self {
Reasoning::Default => "Default",
Reasoning::Level(effort) => effort.label(),
Reasoning::Ultracode => "Ultracode",
Reasoning::Ultrathink => "Ultrathink",
}
}
/// How the settings file spells it: `default`, an effort level,
/// `ultracode` or `ultrathink`.
pub fn key(self) -> &'static str {
match self {
Reasoning::Default => "default",
Reasoning::Level(effort) => effort.as_cli(),
Reasoning::Ultracode => "ultracode",
Reasoning::Ultrathink => "ultrathink",
}
}
pub fn from_key(key: &str) -> Option<Self> {
match key {
"default" => Some(Reasoning::Default),
"ultracode" => Some(Reasoning::Ultracode),
"ultrathink" => Some(Reasoning::Ultrathink),
key => Effort::from_cli(key).map(Reasoning::Level),
}
}
/// The effort level the agent runs at.
fn effort(self) -> Option<Effort> {
match self {
Reasoning::Level(effort) => Some(effort),
Reasoning::Ultracode => Some(Effort::XHigh),
Reasoning::Default | Reasoning::Ultrathink => None,
}
}
}
enum PendingControl {
Initialize,
SetModel,
SetPermissionMode,
FlagSettings,
Interrupt,
}
/// A finished turn, which the transcript folds into one "Worked for …" row
/// above its final answer.
pub struct FinishedTurn {
/// The first item after the user's message; the fold row sits here.
pub first: usize,
/// The last assistant message, which stays visible.
pub answer: Option<usize>,
/// The turn's `TurnEnd` item.
pub end: usize,
pub duration_ms: u64,
pub cost: Option<f64>,
/// When it ended.
pub at: SystemTime,
/// Whether anything besides the answer happened (tools, interim text).
pub has_work: bool,
}
/// Maps the content blocks of the message currently being streamed to the
/// chat items they render into.
struct StreamingMessage {
blocks: HashMap<u64, usize>,
}
pub struct Session {
/// Names the thread's file on disk.
pub id: String,
pub provider: Provider,
/// The provider instance running it (`claude`, `claude-2`, `pi`).
pub instance: String,
pub title: SharedString,
/// Set by the user; generated titles don't replace it.
pub title_custom: bool,
/// The project folder the thread belongs to.
pub project: PathBuf,
/// Where the agent runs: the project folder, or a place in the thread's worktree.
pub cwd: PathBuf,
pub worktree: Option<Worktree>,
/// The worktree to create when the first message is sent.
pub pending_worktree: Option<WorktreePlan>,
pub pull_request: Option<PullRequest>,
pub items: Vec<ChatItem>,
pub status: SessionStatus,
pub thinking: bool,
/// What a restarted process resumes: Claude's session id or Pi's session file.
resume_id: Option<String>,
/// The model picked for the thread; `None` means the agent's default.
pub model: Option<String>,
/// The concrete model the agent reported, e.g. `claude-opus-5-5`.
pub active_model: Option<String>,
pub permission_mode: PermissionMode,
pub reasoning: Reasoning,
pub fast_mode: bool,
/// The thinking levels Pi offers for the current model.
pub pi_efforts: Vec<Effort>,
pub total_cost: f64,
/// What the current process has reported spending; restarts reset it.
process_cost: f64,
/// Pi reports cost per message; this sums the running turn.
turn_cost: f64,
pub turn_started: Option<Instant>,
pub created: SystemTime,
/// When the thread last saw activity, for ordering the thread list.
pub updated: SystemTime,
/// When the user last sent a message.
pub last_message: SystemTime,
/// Filed away by the user: its process is stopped until the next message.
pub settled: bool,
/// Kept at the top of the thread list.
pub pinned: bool,
/// Hidden from the thread list until then.
pub snoozed_until: Option<SystemTime>,
/// When a usage limit that stopped the thread resets.
pub limit_resets: Option<SystemTime>,
/// When to continue the thread on its own, after a usage limit.
pub resume_at: Option<SystemTime>,
/// Messages held until the running turn ends.
pub queue: Vec<QueuedMessage>,
/// Restored from disk after the app stopped it mid-turn.
pub interrupted: bool,
/// Creating the worktree before the first message goes out.
pub preparing: bool,
/// Tokens in the context window as of the last response.
pub context_tokens: Option<u64>,
pub context_window: Option<u64>,
/// Finished turns the user unfolded, keyed by their `TurnEnd` index.
expanded_turns: HashSet<usize>,
/// What each finished turn changed on disk, keyed by its `TurnEnd` index.
turn_changes: HashMap<usize, TurnChanges>,
/// Folders the user opened in a turn's change overview.
expanded_dirs: HashMap<usize, HashSet<String>>,
/// The private git index snapshots are staged into.
snapshot_index: PathBuf,
/// The working tree as the running turn found it.
base_snapshot: Option<Task<Option<String>>>,
/// Set when the user stops a turn, so its error result isn't reported.
interrupt_requested: bool,
stderr_tail: VecDeque<String>,
process: Option<AgentProcess>,
streaming: Option<StreamingMessage>,
streamed_message_ids: HashSet<String>,
pending_controls: HashMap<String, PendingControl>,
next_request_id: u64,
_events_task: Task<()>,
}
/// What a new thread starts with.
pub struct NewSession {
pub instance: String,
pub provider: Provider,
pub project: PathBuf,
pub model: Option<String>,
pub permission_mode: PermissionMode,
pub reasoning: Reasoning,
pub fast_mode: bool,
/// Start in a worktree of its own, made when the first message is sent.
pub worktree: Option<WorktreePlan>,
}
impl EventEmitter<SessionEvent> for Session {}
impl Session {
pub fn new(new: NewSession, cx: &mut Context<Self>) -> Self {
let now = SystemTime::now();
let id = format!(
"{:x}-{:x}-{}",
now.duration_since(UNIX_EPOCH).unwrap_or_default().as_millis(),
std::process::id(),
NEXT_SESSION.load(Ordering::Relaxed)
);
let start = new.worktree.is_none();
let mut session = Self::empty(id, new, now);
if start {
session.start(None, cx);
} else {
session.status = SessionStatus::Idle;
}
session
}
fn empty(id: String, new: NewSession, now: SystemTime) -> Self {
let snapshot_index = std::env::temp_dir().join(format!(
"vectrum-code-{}-{}.index",
std::process::id(),
NEXT_SESSION.fetch_add(1, Ordering::Relaxed)
));
let NewSession { instance, provider, project, model, permission_mode, reasoning, fast_mode, worktree } = new;
Self {
id,
provider,
instance,
title: DEFAULT_TITLE.into(),
title_custom: false,
cwd: project.clone(),
project,
worktree: None,
pending_worktree: worktree,
pull_request: None,
items: Vec::new(),
status: SessionStatus::Starting,
thinking: false,
resume_id: None,
model,
active_model: None,
permission_mode,
reasoning,
fast_mode,
pi_efforts: Vec::new(),
total_cost: 0.,
process_cost: 0.,
turn_cost: 0.,
turn_started: None,
created: now,
updated: now,
last_message: now,
settled: false,
pinned: false,
snoozed_until: None,
limit_resets: None,
resume_at: None,
queue: Vec::new(),
interrupted: false,
preparing: false,
context_tokens: None,
context_window: None,
expanded_turns: HashSet::new(),
turn_changes: HashMap::new(),
expanded_dirs: HashMap::new(),
snapshot_index,
base_snapshot: None,
interrupt_requested: false,
stderr_tail: VecDeque::new(),
process: None,
streaming: None,
streamed_message_ids: HashSet::new(),
pending_controls: HashMap::new(),
next_request_id: 0,
_events_task: Task::ready(()),
}
}
pub fn is_working(&self) -> bool {
self.status == SessionStatus::Working
}
/// True while a tool call or question is waiting for the user.
pub fn needs_attention(&self) -> bool {
self.items.iter().any(|item| match item {
ChatItem::Tool(ToolCall { permission: Some(prompt), .. }) => {
prompt.state == PermissionState::Pending
}
ChatItem::Question(question) => question.answer.is_none(),
_ => false,
})
}
fn start(&mut self, resume: Option<String>, cx: &mut Context<Self>) {
let (tx, rx) = smol::channel::unbounded();
let config = LaunchConfig {
instance: settings::instance(&self.instance, self.provider),
cwd: self.cwd.clone(),
model: self.model.clone(),
permission_mode: self.permission_mode,
effort: self.reasoning.effort(),
resume,
browser_session: Some(browser::session_name(&self.id)),
};
let process = match AgentProcess::spawn(&config, tx) {
Ok(process) => process,
Err(err) => {
self.status = SessionStatus::Exited;
self.push_notice(NoticeKind::Error, format!("{err:#}"));
return;
}
};
self.status = SessionStatus::Starting;
self.process_cost = 0.;
self.stderr_tail.clear();
self.process = Some(process);
match self.provider {
Provider::Claude => {
self.control(PendingControl::Initialize, json!({"subtype": "initialize"}));
// Ultracode and fast mode have no launch flag; they're flag settings.
let mut settings = serde_json::Map::new();
if self.reasoning == Reasoning::Ultracode {
settings.insert("ultracode".into(), true.into());
}
if self.fast_mode {
settings.insert("fastMode".into(), true.into());
}
if !settings.is_empty() {
self.control(
PendingControl::FlagSettings,
json!({"subtype": "apply_flag_settings", "settings": settings}),
);
}
}
Provider::Pi => {
self.pi(json!({"type": "get_state"}));
self.pi(json!({"type": "get_available_thinking_levels"}));
}
}
self._events_task = cx.spawn(async move |this, cx| {
while let Ok(event) = rx.recv().await {
// Fold whatever else is already queued into one update so a
// fast token stream doesn't re-render per delta.
let mut batch = vec![event];
while let Ok(event) = rx.try_recv() {
batch.push(event);
}
let updated = this.update(cx, |this, cx| {
for event in batch {
this.handle_event(event, cx);
}
cx.notify();
});
if updated.is_err() {
break;
}
}
});
}
fn request_id(&mut self) -> String {
self.next_request_id += 1;
format!("vectrum-code-{}", self.next_request_id)
}
/// Sends a Claude control request and remembers what it was for.
fn control(&mut self, kind: PendingControl, request: Value) {
let request_id = self.request_id();
if let Some(process) = &self.process {
self.pending_controls.insert(request_id.clone(), kind);
process.send_control(&request_id, request);
}
}
/// Sends a Pi RPC command.
fn pi(&mut self, mut command: Value) {
let id = self.request_id();
command["id"] = id.into();
if let Some(process) = &self.process {
process.send(command);
}
}
// ---- user actions -------------------------------------------------
/// Sends a message now, even mid-turn, where the agent takes it in as
/// soon as it can. Images are attached inline; other files are listed by
/// path for the agent to read. The thread's first message also creates
/// its worktree, if it starts in one.
pub fn send_message(&mut self, text: String, attachments: Vec<PathBuf>, cx: &mut Context<Self>) {
if text.trim().is_empty() && attachments.is_empty() {
return;
}
let names: Vec<SharedString> = attachments.iter().map(|path| file_name(path).into()).collect();
let first = !self.items.iter().any(|item| matches!(item, ChatItem::User { .. }));
let now = SystemTime::now();
self.items.push(ChatItem::User { text: text.clone().into(), attachments: names.clone(), at: now });
self.last_message = now;
self.updated = now;
self.settled = false;
self.snoozed_until = None;
self.resume_at = None;
self.interrupted = false;
if first {
let source = if text.trim().is_empty() { names.join(", ") } else { text.clone() };
if !self.title_custom {
self.title = title_from(&source).into();
self.generate_title(source, cx);
}
}
if let Some(plan) = self.pending_worktree.take() {
self.status = SessionStatus::Working;
self.preparing = true;
self.turn_started = Some(Instant::now());
self.turn_cost = 0.;
let title = self.title.to_string();
let task = cx.background_executor().spawn(async move { worktree::create(&plan, &title) });
cx.spawn(async move |this, cx| {
let created = task.await;
let _ = this.update(cx, |this, cx| {
this.preparing = false;
match created {
Ok((worktree, cwd)) => {
this.cwd = cwd;
this.worktree = Some(worktree);
}
Err(err) => this.push_notice(
NoticeKind::Error,
format!("Couldn't create a worktree: {err}\n\nThe thread runs in the project folder instead."),
),
}
this.start(None, cx);
this.snapshot_base(cx);
this.deliver(text, attachments, cx);
cx.notify();
});
})
.detach();
cx.notify();
return;
}
if !self.is_working() {
self.turn_started = Some(Instant::now());
self.turn_cost = 0.;
self.snapshot_base(cx);
}
self.deliver(text, attachments, cx);
self.status = SessionStatus::Working;
cx.notify();
}
/// Holds a message until the running turn ends; sends it now if none runs.
pub fn queue_message(&mut self, text: String, attachments: Vec<PathBuf>, cx: &mut Context<Self>) {
if !self.is_working() {
self.send_message(text, attachments, cx);
return;
}
if text.trim().is_empty() && attachments.is_empty() {
return;
}
self.queue.push(QueuedMessage { text, attachments });
cx.notify();
}
/// Sends a queued message now instead of after the turn.
pub fn steer_queued(&mut self, ix: usize, cx: &mut Context<Self>) {
if ix < self.queue.len() {
let message = self.queue.remove(ix);
self.send_message(message.text, message.attachments, cx);
}
}
pub fn remove_queued(&mut self, ix: usize, cx: &mut Context<Self>) {
if ix < self.queue.len() {
self.queue.remove(ix);
cx.notify();
}
}
/// Sends the next queued message once a turn has ended.
fn send_next_queued(&mut self, cx: &mut Context<Self>) {
if !self.is_working() && !self.queue.is_empty() {
let message = self.queue.remove(0);
self.send_message(message.text, message.attachments, cx);
}
}
/// Records the working tree as the starting turn finds it.
fn snapshot_base(&mut self, cx: &mut Context<Self>) {
let cwd = self.cwd.clone();
let index = self.snapshot_index.clone();
self.base_snapshot = Some(cx.background_executor().spawn(async move { git::snapshot(&cwd, &index) }));
}
/// Writes a message to the agent, starting (or resuming) its process if
/// it isn't running.
fn deliver(&mut self, text: String, attachments: Vec<PathBuf>, cx: &mut Context<Self>) {
let mut images = Vec::new();
let mut file_paths = Vec::new();
for path in &attachments {
match image_media_type(path) {
Some(media_type) => match read_image(path) {
Ok(data) => images.push((media_type, data)),
Err(err) => {
self.push_notice(NoticeKind::Error, format!("Couldn't attach {}: {err}", file_name(path)));
continue;
}
},
None => file_paths.push(path.display().to_string()),
}
}
let mut prompt = text;
if !file_paths.is_empty() {
if !prompt.is_empty() {
prompt.push_str("\n\n");
}
prompt.push_str("Attached files:");
for path in &file_paths {
prompt.push_str(&format!("\n- {path}"));
}
}
if prompt.is_empty() && images.is_empty() {
return;
}
if self.provider == Provider::Claude && self.reasoning == Reasoning::Ultrathink {
// Claude Code's keyword for deeper reasoning on this turn.
prompt.push_str("\n\nultrathink");
}
if self.process.is_none() {
let resume = self.resume_id.clone();
self.start(resume, cx);
}
let Some(process) = &self.process else {
self.status = SessionStatus::Exited;
self.turn_started = None;
return;
};
match self.provider {
Provider::Claude => {
let mut content: Vec<Value> = images
.iter()
.map(|(media_type, data)| {
json!({"type": "image", "source": {"type": "base64", "media_type": media_type, "data": data}})
})
.collect();
// The API rejects empty text blocks; images go first, as it prefers.
if !prompt.is_empty() {
content.push(json!({"type": "text", "text": prompt}));
}
process.send_user_content(content);
}
Provider::Pi => {
let mut command = json!({
"type": "prompt",
"message": prompt,
"images": images
.iter()
.map(|(media_type, data)| json!({"type": "image", "data": data, "mimeType": media_type}))
.collect::<Vec<_>>(),
});
// Pi rejects a prompt mid-run unless told when to deliver it.
if self.is_working() {
command["streamingBehavior"] = "steer".into();
}
self.pi(command);
}
}
self.status = SessionStatus::Working;
}
/// Asks the text generation model for a title, in the background.
fn generate_title(&mut self, message: String, cx: &mut Context<Self>) {
if settings::get(|settings| settings.text_model.is_empty()) {
return;
}
let task = cx.background_executor().spawn(async move { crate::textgen::title(&message) });
cx.spawn(async move |this, cx| {
let Some(title) = task.await else { return };
let _ = this.update(cx, |this, cx| {
if !this.title_custom {
this.title = title.into();
cx.notify();
}
});
})
.detach();
}
pub fn rename(&mut self, title: String, cx: &mut Context<Self>) {
let title = title.trim();
if title.is_empty() {
return;
}
self.title = title.to_string().into();
self.title_custom = true;
cx.notify();
}
/// Picks where the (still empty) thread will run: in the project folder,
/// or a worktree made with its first message.
pub fn set_worktree_plan(&mut self, plan: Option<WorktreePlan>, cx: &mut Context<Self>) {
if !self.items.is_empty() || self.worktree.is_some() {
return;
}
let had_plan = self.pending_worktree.is_some();
self.pending_worktree = plan;
match (had_plan, self.pending_worktree.is_some()) {
(false, true) => {
// The agent starts in the worktree once there is one.
self.process.take();
self._events_task = Task::ready(());
self.pending_controls.clear();
self.status = SessionStatus::Idle;
}
(true, false) if self.process.is_none() => self.start(None, cx),
_ => {}
}
cx.notify();
}
pub fn set_pinned(&mut self, pinned: bool, cx: &mut Context<Self>) {
self.pinned = pinned;
cx.notify();
}
pub fn snooze(&mut self, until: Option<SystemTime>, cx: &mut Context<Self>) {
self.snoozed_until = until;
if until.is_none() {
self.updated = SystemTime::now();
}
cx.notify();
}
pub fn is_snoozed(&self) -> bool {
self.snoozed_until.is_some_and(|until| until > SystemTime::now())
}
/// When the usage limit that stopped the thread resets, while it hasn't.
pub fn limited_until(&self) -> Option<SystemTime> {
self.limit_resets.filter(|resets| *resets > SystemTime::now())
}
/// Drops the continuation scheduled for when a usage limit resets.
pub fn cancel_resume(&mut self, cx: &mut Context<Self>) {
self.resume_at = None;
cx.notify();
}
/// Whether the last turn ended in an error.
pub fn ended_with_error(&self) -> bool {
self.status == SessionStatus::Exited
|| self
.items
.iter()
.rev()
.take_while(|item| !matches!(item, ChatItem::User { .. }))
.any(|item| matches!(item, ChatItem::Notice(NoticeKind::Error, _)))
}
/// Files the thread under Settled and stops its process. The transcript
/// stays, and the next message resumes the conversation.
pub fn settle(&mut self, cx: &mut Context<Self>) {
self.flush_text(cx);
self.process.take();
// Drop the event stream too, so the process exit isn't reported as a crash.
self._events_task = Task::ready(());
self.thinking = false;
self.streaming = None;
self.turn_started = None;
self.base_snapshot = None;
self.interrupt_requested = false;
self.pending_controls.clear();
self.finish_open_tools("The thread was settled before the tool finished.");
if self.status != SessionStatus::Exited {
self.status = SessionStatus::Idle;
}
self.settled = true;
self.preparing = false;
cx.notify();
}
/// Brings a settled thread back to the open list. Its process starts again
/// with the next message.
pub fn unsettle(&mut self, cx: &mut Context<Self>) {
self.settled = false;
self.updated = SystemTime::now();
cx.notify();
}
pub fn interrupt(&mut self, cx: &mut Context<Self>) {
if !self.is_working() || self.interrupt_requested || self.process.is_none() {
return;
}
self.interrupt_requested = true;
match self.provider {
Provider::Claude => self.control(PendingControl::Interrupt, json!({"subtype": "interrupt"})),
Provider::Pi => self.pi(json!({"type": "abort"})),
}
cx.notify();
}
pub fn set_model(&mut self, model: Option<String>, cx: &mut Context<Self>) {
self.model = model.clone();
match self.provider {
Provider::Claude => self.control(
PendingControl::SetModel,
json!({"subtype": "set_model", "model": model.as_deref().unwrap_or("default")}),
),
Provider::Pi => {
if let Some((provider, model_id)) = model.as_deref().and_then(|model| model.split_once('/')) {
self.pi(json!({"type": "set_model", "provider": provider, "modelId": model_id}));
self.pi(json!({"type": "get_available_thinking_levels"}));
}
}
}
cx.notify();
}
pub fn set_permission_mode(&mut self, mode: PermissionMode, cx: &mut Context<Self>) {
// Pi has no permission prompts to configure.
if self.provider != Provider::Claude {
return;
}
self.permission_mode = mode;
self.control(
PendingControl::SetPermissionMode,
json!({"subtype": "set_permission_mode", "mode": mode.as_cli()}),
);
cx.notify();
}
pub fn set_reasoning(&mut self, reasoning: Reasoning, cx: &mut Context<Self>) {
self.reasoning = reasoning;
match self.provider {
Provider::Claude => self.control(
PendingControl::FlagSettings,
json!({
"subtype": "apply_flag_settings",
"settings": {
"effortLevel": reasoning.effort().map(Effort::as_cli),
"ultracode": reasoning == Reasoning::Ultracode,
},
}),
),
Provider::Pi => {
if let Some(effort) = reasoning.effort() {
self.pi(json!({"type": "set_thinking_level", "level": effort.as_cli()}));
}
}
}
cx.notify();
}
pub fn set_fast_mode(&mut self, on: bool, cx: &mut Context<Self>) {
if self.provider != Provider::Claude {
return;
}
self.fast_mode = on;
self.control(
PendingControl::FlagSettings,
json!({"subtype": "apply_flag_settings", "settings": {"fastMode": on}}),
);
cx.notify();
}
pub fn turn_expanded(&self, end: usize) -> bool {
self.expanded_turns.contains(&end)
}
pub fn toggle_turn(&mut self, end: usize, cx: &mut Context<Self>) {
if !self.expanded_turns.remove(&end) {
self.expanded_turns.insert(end);
}
cx.notify();
}
pub fn turn_changes(&self, end: usize) -> Option<&TurnChanges> {
self.turn_changes.get(&end)
}
pub fn dir_expanded(&self, end: usize, dir: &str) -> bool {
self.expanded_dirs.get(&end).is_some_and(|dirs| dirs.contains(dir))
}
pub fn toggle_dir(&mut self, end: usize, dir: String, cx: &mut Context<Self>) {
let dirs = self.expanded_dirs.entry(end).or_default();
if !dirs.remove(&dir) {
dirs.insert(dir);
}
cx.notify();
}
/// Opens every folder of a turn's change overview, or closes them all.
pub fn set_dirs(&mut self, end: usize, dirs: HashSet<String>, cx: &mut Context<Self>) {
self.expanded_dirs.insert(end, dirs);
cx.notify();
}
/// The finished turn item `ix` belongs to, if its turn has ended. A turn
/// runs from after a user message (or the previous turn's end) to the
/// next `TurnEnd`.
pub fn finished_turn(&self, ix: usize) -> Option<FinishedTurn> {
if matches!(self.items.get(ix)?, ChatItem::User { .. }) {
return None;
}
let first = self.items[..ix]
.iter()
.rposition(|item| matches!(item, ChatItem::User { .. } | ChatItem::TurnEnd { .. }))
.map_or(0, |boundary| boundary + 1);
let end = ix + self.items[ix..]
.iter()
.position(|item| matches!(item, ChatItem::User { .. } | ChatItem::TurnEnd { .. }))?;
let ChatItem::TurnEnd { duration_ms, cost, at } = self.items[end] else {
return None;
};
let answer = (first..end)
.rev()
.find(|&ix| matches!(self.items[ix], ChatItem::Assistant(_)));
let has_work = (first..end).any(|ix| {
Some(ix) != answer && !matches!(self.items[ix], ChatItem::Notice(NoticeKind::Error, _))
});
Some(FinishedTurn { first, answer, end, duration_ms, cost, at, has_work })
}
pub fn toggle_tool(&mut self, ix: usize, cx: &mut Context<Self>) {
if let Some(ChatItem::Tool(tool)) = self.items.get_mut(ix) {
tool.expanded = !tool.expanded;
cx.notify();
}
}
pub fn respond_permission(
&mut self,
ix: usize,
decision: PermissionDecision,
cx: &mut Context<Self>,
) {
let Some(process) = &self.process else { return };
let Some(ChatItem::Tool(tool)) = self.items.get_mut(ix) else { return };
let Some(prompt) = tool.permission.as_mut() else { return };
if prompt.state != PermissionState::Pending {
return;
}
let response = match decision {
PermissionDecision::Allow => json!({"behavior": "allow", "updatedInput": prompt.input}),
PermissionDecision::AllowAlways => json!({
"behavior": "allow",
"updatedInput": prompt.input,
"updatedPermissions": prompt.suggestions,
}),
PermissionDecision::Deny => {
json!({"behavior": "deny", "message": "The user declined this tool use."})
}
};
process.respond_control(&prompt.request_id, response);
prompt.state = match decision {
PermissionDecision::Deny => PermissionState::Denied,
_ => PermissionState::Allowed,
};
if tool.detached {
tool.state = match decision {
PermissionDecision::Deny => ToolState::Error,
_ => ToolState::Done,
};
}
if decision == PermissionDecision::AllowAlways {
let new_mode = prompt.suggestions.iter().find_map(|suggestion| {
(suggestion.get("type").and_then(Value::as_str) == Some("setMode"))
.then(|| suggestion.get("mode").and_then(Value::as_str))
.flatten()
.and_then(PermissionMode::from_cli)
});
if let Some(mode) = new_mode {
self.permission_mode = mode;
}
}
cx.notify();
}
/// Answers an extension's question with one of its options.
pub fn answer_question(&mut self, ix: usize, option: usize, cx: &mut Context<Self>) {
let Some(process) = &self.process else { return };
let Some(ChatItem::Question(question)) = self.items.get_mut(ix) else { return };
let Some(answer) = question.options.get(option).cloned() else { return };
if question.answer.is_some() {
return;
}
let response = if question.confirm {
json!({"type": "extension_ui_response", "id": question.request_id, "confirmed": option == 0})
} else {
json!({"type": "extension_ui_response", "id": question.request_id, "value": answer.as_ref()})
};
process.send(response);
question.answer = Some(answer);
cx.notify();
}
pub fn shutdown(&mut self) {
self.process.take();
}
// ---- protocol handling -------------------------------------------
fn handle_event(&mut self, event: ProcessEvent, cx: &mut Context<Self>) {
match event {
ProcessEvent::Message(message) => match self.provider {
Provider::Claude => self.handle_message(message, cx),
Provider::Pi => self.handle_pi_message(message, cx),
},
ProcessEvent::Stderr(line) => {
if self.stderr_tail.len() == STDERR_TAIL {
self.stderr_tail.pop_front();
}
self.stderr_tail.push_back(line);
}
ProcessEvent::Exited(code) => self.handle_exit(code, cx),
}
}
fn handle_exit(&mut self, code: Option<i32>, cx: &mut Context<Self>) {
self.flush_text(cx);
self.process = None;
self.thinking = false;
self.streaming = None;
self.status = SessionStatus::Exited;
self.turn_started = None;
self.base_snapshot = None;
self.finish_open_tools("The agent exited before the tool finished.");
let agent = match self.provider {
Provider::Claude => "Claude Code",
Provider::Pi => "Pi",
};
let mut text = match code {
Some(code) => format!("{agent} exited with status {code}."),
None => format!("{agent} was terminated."),
};
if !self.stderr_tail.is_empty() {
text.push_str("\n\n");
text.push_str(&Vec::from(self.stderr_tail.clone()).join("\n"));
}
text.push_str("\n\nSend a message to restart it.");
self.push_notice(NoticeKind::Error, text);
}
/// Closes the running turn: records its end and, in the background, what
/// it changed on disk.
fn finish_turn(&mut self, duration_ms: u64, cost: Option<f64>, cx: &mut Context<Self>) {
self.flush_text(cx);
self.turn_started = None;
let now = SystemTime::now();
self.updated = now;
self.items.push(ChatItem::TurnEnd { duration_ms, cost, at: now });
let end = self.items.len() - 1;
let Some(base) = self.base_snapshot.take() else { return };
let cwd = self.cwd.clone();
let index = self.snapshot_index.clone();
cx.spawn(async move |this, cx| {
let Some(base) = base.await else { return };
let changes = cx
.background_executor()
.spawn(async move {
let head = git::snapshot(&cwd, &index)?;
git::changes_between(&cwd, &base, &head)
})
.await;
if let Some(changes) = changes.filter(|changes| !changes.files.is_empty()) {
let _ = this.update(cx, |this, cx| {
this.turn_changes.insert(end, changes);
cx.emit(SessionEvent::TurnChanges(end));
cx.notify();
});
}
})
.detach();
}
// ---- Claude Code (stream-json) -------------------------------------
fn handle_message(&mut self, message: Value, cx: &mut Context<Self>) {
if let Some(session_id) = message.get("session_id").and_then(Value::as_str)
&& self.resume_id.as_deref() != Some(session_id)
{
self.resume_id = Some(session_id.to_string());
}
let parent_tool_use_id = message.get("parent_tool_use_id").and_then(Value::as_str);
match message.get("type").and_then(Value::as_str) {
Some("system") => self.handle_system(&message),
Some("stream_event") if parent_tool_use_id.is_none() => {
self.handle_stream_event(&message["event"], cx)
}
Some("assistant") => match parent_tool_use_id {
Some(parent) => self.count_subagent_tools(parent, &message["message"]),
None => {
self.record_usage(&message["message"]);
self.handle_assistant(&message["message"], cx)
}
},
Some("user") if parent_tool_use_id.is_none() => self.handle_user(&message["message"]),
Some("result") => self.handle_result(&message, cx),
Some("rate_limit_event") => self.handle_rate_limit(&message["rate_limit_info"]),
Some("control_request") => self.handle_control_request(&message),
Some("control_response") => self.handle_control_response(&message["response"], cx),
Some("control_cancel_request") => {
if let Some(request_id) = message.get("request_id").and_then(Value::as_str) {
self.cancel_permission(request_id);
}
}
_ => {}
}
}
/// Tracks how full the context window is from a response's token usage.
fn record_usage(&mut self, message: &Value) {
let Some(usage) = message.get("usage") else { return };
let tokens: u64 = ["input_tokens", "cache_creation_input_tokens", "cache_read_input_tokens", "output_tokens"]
.iter()
.filter_map(|key| usage.get(*key).and_then(Value::as_u64))
.sum();
if tokens > 0 {
self.context_tokens = Some(tokens);
}
}
fn handle_system(&mut self, message: &Value) {
if let Some(mode) = message
.get("permissionMode")
.and_then(Value::as_str)
.and_then(PermissionMode::from_cli)
{
self.permission_mode = mode;
}
match message.get("subtype").and_then(Value::as_str) {
Some("init") => {
if let Some(model) = message.get("model").and_then(Value::as_str) {
self.active_model = Some(model.to_string());
}
}
Some("compact_boundary") => {
self.push_notice(NoticeKind::Info, "Conversation compacted to free up context.")
}
_ => {}
}
}
fn handle_stream_event(&mut self, event: &Value, cx: &mut Context<Self>) {
let index = event.get("index").and_then(Value::as_u64).unwrap_or(0);
match event.get("type").and_then(Value::as_str) {
Some("message_start") => {
if let Some(id) = event.pointer("/message/id").and_then(Value::as_str) {
self.streamed_message_ids.insert(id.to_string());
}
self.streaming = Some(StreamingMessage { blocks: HashMap::new() });
}
Some("content_block_start") => {
let block = &event["content_block"];
let item_ix = match block.get("type").and_then(Value::as_str) {
Some("text") => {
let text = block.get("text").and_then(Value::as_str).unwrap_or_default();
Some(self.push_assistant_text(text, cx))
}
Some("tool_use") => Some(self.push_tool(
block.get("id").and_then(Value::as_str).unwrap_or_default(),
block.get("name").and_then(Value::as_str).unwrap_or("Tool"),
block.get("input").cloned().unwrap_or(Value::Null),
)),
Some("thinking" | "redacted_thinking") => {
self.thinking = true;
None
}
_ => None,
};
if let (Some(item_ix), Some(streaming)) = (item_ix, self.streaming.as_mut()) {
streaming.blocks.insert(index, item_ix);
}
}
Some("content_block_delta") => {
let Some(item_ix) = self.streamed_item(index) else { return };
let delta = &event["delta"];
match (delta.get("type").and_then(Value::as_str), self.items.get_mut(item_ix)) {
(Some("text_delta"), Some(ChatItem::Assistant(_))) => {
let text = delta.get("text").and_then(Value::as_str).unwrap_or_default();
self.append_text(item_ix, text, cx);
}
(Some("input_json_delta"), Some(ChatItem::Tool(tool))) => {
let json = delta.get("partial_json").and_then(Value::as_str);
tool.partial_input.push_str(json.unwrap_or_default());
}
_ => {}
}
}
Some("content_block_stop") => {
self.thinking = false;
if let Some(ix) = self.streamed_item(index) {
self.flush_item(ix, cx);
}
if let Some(ChatItem::Tool(tool)) = self.streamed_item(index).and_then(|ix| self.items.get_mut(ix))
&& let Ok(input) = serde_json::from_str::<Value>(&tool.partial_input)
{
tool.input = input;
}
}
Some("message_stop") => {
self.thinking = false;
self.streaming = None;
}
_ => {}
}
}
fn streamed_item(&self, index: u64) -> Option<usize> {
self.streaming.as_ref().and_then(|streaming| streaming.blocks.get(&index).copied())
}
/// Complete assistant messages. Content we already streamed is skipped;
/// they only carry the authoritative tool inputs in that case.
fn handle_assistant(&mut self, message: &Value, cx: &mut Context<Self>) {
let already_streamed = message
.get("id")
.and_then(Value::as_str)
.is_some_and(|id| self.streamed_message_ids.contains(id));
let Some(blocks) = message.get("content").and_then(Value::as_array) else { return };
for block in blocks {
match block.get("type").and_then(Value::as_str) {
Some("text") if !already_streamed => {
let text = block.get("text").and_then(Value::as_str).unwrap_or_default();
if !text.trim().is_empty() {
self.push_assistant_text(text, cx);
}
}
Some("tool_use") => {
let id = block.get("id").and_then(Value::as_str).unwrap_or_default();
match self.find_tool_mut(id) {
Some(tool) => tool.input = block["input"].clone(),
None => {
self.push_tool(
id,
block.get("name").and_then(Value::as_str).unwrap_or("Tool"),
block["input"].clone(),
);
}
}
}
_ => {}
}
}
}
fn count_subagent_tools(&mut self, parent: &str, message: &Value) {
let count = message
.get("content")
.and_then(Value::as_array)
.map(|blocks| {
blocks
.iter()
.filter(|block| block.get("type").and_then(Value::as_str) == Some("tool_use"))
.count()
})
.unwrap_or(0);
if let Some(tool) = self.find_tool_mut(parent) {
tool.subagent_tool_count += count;
}
}
fn handle_user(&mut self, message: &Value) {
let content = match message.get("content") {
Some(Value::Array(blocks)) => blocks.clone(),
Some(Value::String(text)) => vec![json!({"type": "text", "text": text})],
_ => return,
};
for block in content {
match block.get("type").and_then(Value::as_str) {
Some("tool_result") => {
let id = block.get("tool_use_id").and_then(Value::as_str).unwrap_or_default();
let is_error = block.get("is_error").and_then(Value::as_bool).unwrap_or(false);
let text = tool_result_text(&block["content"]);
if let Some(tool) = self.find_tool_mut(id) {
tool.result = Some(text);
tool.state = if is_error { ToolState::Error } else { ToolState::Done };
if let Some(prompt) = tool.permission.as_mut()
&& prompt.state == PermissionState::Pending
{
prompt.state = PermissionState::Cancelled;
}
}
}
Some("text") => {
let text = block.get("text").and_then(Value::as_str).unwrap_or_default();
if text.starts_with("[Request interrupted") {
self.push_notice(NoticeKind::Info, "Interrupted.");
}
}
_ => {}
}
}
}
/// Notes when a usage limit that refused this thread resets.
fn handle_rate_limit(&mut self, info: &Value) {
match info.get("status").and_then(Value::as_str) {
Some("rejected") => {
self.limit_resets = info.get("resetsAt").and_then(Value::as_f64).map(|resets| {
// Seconds since the epoch; milliseconds just in case.
let secs = if resets > 1e12 { resets / 1000. } else { resets };
UNIX_EPOCH + Duration::from_secs_f64(secs.max(0.))
});
}
Some("allowed") => self.limit_resets = None,
_ => {}
}
}
/// After a turn a usage limit stopped: continue or snooze the thread
/// once the limit resets, as the settings say.
fn schedule_after_limit(&mut self) {
let Some(resets) = self.limited_until() else { return };
let (resume, snooze) = settings::get(|settings| (settings.auto_resume_limited, settings.snooze_limited));
if resume {
// A minute's grace, so the limit has surely lifted.
self.resume_at = Some(resets + Duration::from_secs(60));
}
if snooze {
self.snoozed_until = Some(resets);
}
}
fn handle_result(&mut self, message: &Value, cx: &mut Context<Self>) {
self.thinking = false;
self.streaming = None;
self.status = SessionStatus::Idle;
self.finish_open_tools("The turn ended before the tool finished.");
self.cancel_pending_permissions();
let is_error = message.get("is_error").and_then(Value::as_bool).unwrap_or(false);
let subtype = message.get("subtype").and_then(Value::as_str).unwrap_or_default();
let interrupted = std::mem::take(&mut self.interrupt_requested);
if (is_error || subtype != "success") && !interrupted {
let detail = message
.get("result")
.and_then(Value::as_str)
.filter(|text| !text.is_empty())
.map(str::to_string)
.unwrap_or_else(|| subtype.replace('_', " "));
self.push_notice(NoticeKind::Error, detail);
}
// `total_cost_usd` is cumulative for the CLI process.
let cost = message.get("total_cost_usd").and_then(Value::as_f64).map(|total| {
let delta = (total - self.process_cost).max(0.);
self.process_cost = total;
self.total_cost += delta;
delta
});
let duration_ms = message
.get("duration_ms")
.and_then(Value::as_u64)
.or_else(|| self.turn_started.map(|start| start.elapsed().as_millis() as u64))
.unwrap_or(0);
if let Some(models) = message.get("modelUsage").and_then(Value::as_object) {
let window = self
.active_model
.as_deref()
.and_then(|model| models.get(model))
.into_iter()
.chain(models.values())
.find_map(|usage| usage.get("contextWindow").and_then(Value::as_u64));
if window.is_some() {
self.context_window = window;
}
}
self.finish_turn(duration_ms, cost, cx);
self.schedule_after_limit();
self.send_next_queued(cx);
}
fn handle_control_request(&mut self, message: &Value) {
let request_id = message.get("request_id").and_then(Value::as_str).unwrap_or_default();
let request = &message["request"];
if request.get("subtype").and_then(Value::as_str) != Some("can_use_tool") {
// We don't implement hooks or SDK MCP servers; say so instead of
// leaving the CLI waiting forever.
if let Some(process) = &self.process {
process.send(json!({
"type": "control_response",
"response": {
"subtype": "error",
"request_id": request_id,
"error": "Unsupported control request",
},
}));
}
return;
}
let prompt = PermissionPrompt {
request_id: request_id.to_string(),
input: request["input"].clone(),
suggestions: request
.get("permission_suggestions")
.and_then(Value::as_array)
.cloned()
.unwrap_or_default(),
state: PermissionState::Pending,
};
self.updated = SystemTime::now();
let tool_use_id = request.get("tool_use_id").and_then(Value::as_str).unwrap_or_default();
if let Some(tool) = self.find_tool_mut(tool_use_id) {
tool.input = prompt.input.clone();
tool.permission = Some(prompt);
return;
}
let name = request.get("tool_name").and_then(Value::as_str).unwrap_or("Tool");
let ix = self.push_tool(tool_use_id, name, prompt.input.clone());
if let Some(ChatItem::Tool(tool)) = self.items.get_mut(ix) {
tool.permission = Some(prompt);
tool.detached = true;
}
}
fn handle_control_response(&mut self, response: &Value, cx: &mut Context<Self>) {
let request_id = response.get("request_id").and_then(Value::as_str).unwrap_or_default();
let Some(pending) = self.pending_controls.remove(request_id) else { return };
if response.get("subtype").and_then(Value::as_str) == Some("error") {
let error = response.get("error").and_then(Value::as_str).unwrap_or("unknown error");
let action = match pending {
PendingControl::Initialize => "start Claude Code",
PendingControl::SetModel => "switch model",
PendingControl::SetPermissionMode => "change permission mode",
PendingControl::FlagSettings => "change reasoning or fast mode",
PendingControl::Interrupt => "interrupt",
};
self.push_notice(NoticeKind::Error, format!("Failed to {action}: {error}"));
return;
}
if let PendingControl::Initialize = pending {
let info = &response["response"];
Catalog::set_claude_info(&self.instance, info, cx);
if let Some(mode) = info
.get("current_permission_mode")
.and_then(Value::as_str)
.and_then(PermissionMode::from_cli)
{
self.permission_mode = mode;
}
if self.status == SessionStatus::Starting {
self.status = SessionStatus::Idle;
}
}
}
// ---- Pi (JSONL RPC) -----------------------------------------------
fn handle_pi_message(&mut self, message: Value, cx: &mut Context<Self>) {
match message.get("type").and_then(Value::as_str) {
Some("response") => self.handle_pi_response(&message),
Some("agent_start") => {
self.status = SessionStatus::Working;
self.turn_started.get_or_insert_with(Instant::now);
}
Some("message_start") if message.pointer("/message/role").and_then(Value::as_str) == Some("assistant") => {
self.streaming = Some(StreamingMessage { blocks: HashMap::new() });
}
Some("message_update") => self.handle_pi_update(&message["assistantMessageEvent"], cx),
Some("message_end") if message.pointer("/message/role").and_then(Value::as_str) == Some("assistant") => {
let message = &message["message"];
self.thinking = false;
self.streaming = None;
if let Some(usage) = message.get("usage") {
let tokens: u64 = ["input", "cacheRead", "cacheWrite", "output"]
.iter()
.filter_map(|key| usage.get(*key).and_then(Value::as_u64))
.sum();
if tokens > 0 {
self.context_tokens = Some(tokens);
}
let cost = usage.pointer("/cost/total").and_then(Value::as_f64).unwrap_or(0.);
self.turn_cost += cost;
self.total_cost += cost;
}
match message.get("stopReason").and_then(Value::as_str) {
Some("error") if !self.interrupt_requested => {
let error = message.get("errorMessage").and_then(Value::as_str).unwrap_or("The model returned an error.");
self.push_notice(NoticeKind::Error, error.to_string());
}
Some("aborted") => self.push_notice(NoticeKind::Info, "Interrupted."),
_ => {}
}
}
Some("tool_execution_start") => {
let id = message.get("toolCallId").and_then(Value::as_str).unwrap_or_default();
if self.find_tool_mut(id).is_none() {
self.push_tool(
id,
message.get("toolName").and_then(Value::as_str).unwrap_or("tool"),
message.get("args").cloned().unwrap_or(Value::Null),
);
}
}
Some("tool_execution_end") => {
let id = message.get("toolCallId").and_then(Value::as_str).unwrap_or_default();
let is_error = message.get("isError").and_then(Value::as_bool).unwrap_or(false);
let text = tool_result_text(message.pointer("/result/content").unwrap_or(&Value::Null));
if let Some(tool) = self.find_tool_mut(id) {
tool.result = Some(text);
tool.state = if is_error { ToolState::Error } else { ToolState::Done };
}
}
Some("agent_settled") => {
self.thinking = false;
self.streaming = None;
self.status = SessionStatus::Idle;
self.interrupt_requested = false;
self.finish_open_tools("The turn ended before the tool finished.");
self.cancel_pending_questions();
let duration_ms = self.turn_started.map_or(0, |start| start.elapsed().as_millis() as u64);
let cost = Some(std::mem::take(&mut self.turn_cost)).filter(|cost| *cost > 0.);
self.finish_turn(duration_ms, cost, cx);
self.send_next_queued(cx);
}
Some("auto_retry_start") => {
let attempt = message.get("attempt").and_then(Value::as_u64).unwrap_or(1);
let max = message.get("maxAttempts").and_then(Value::as_u64).unwrap_or(attempt);
let error = message.get("errorMessage").and_then(Value::as_str).unwrap_or_default();
self.push_notice(NoticeKind::Info, format!("Retrying ({attempt}/{max}) after: {error}"));
}
Some("compaction_start") => {
self.push_notice(NoticeKind::Info, "Compacting the conversation to free up context.")
}
Some("thinking_level_changed") => {
if let Some(effort) = message.get("level").and_then(Value::as_str).and_then(Effort::from_cli) {
self.reasoning = Reasoning::Level(effort);
}
}
Some("extension_ui_request") => self.handle_pi_ui(&message),
Some("extension_error") => {
let error = message.get("error").and_then(Value::as_str).unwrap_or("unknown error");
self.push_notice(NoticeKind::Error, format!("A Pi extension failed: {error}"));
}
_ => {}
}
}
fn handle_pi_response(&mut self, message: &Value) {
let command = message.get("command").and_then(Value::as_str).unwrap_or_default();
if message.get("success").and_then(Value::as_bool) != Some(true) {
let error = message.get("error").and_then(Value::as_str).unwrap_or("unknown error");
if command == "prompt" {
// The prompt never started a run, so no `agent_settled` will come.
self.status = SessionStatus::Idle;
self.turn_started = None;
self.base_snapshot = None;
}
self.push_notice(NoticeKind::Error, format!("Pi couldn't {}: {error}", command.replace('_', " ")));
return;
}
let data = &message["data"];
match command {
"get_state" => {
self.resume_id = data
.get("sessionFile")
.or_else(|| data.get("sessionId"))
.and_then(Value::as_str)
.map(str::to_string);
self.apply_pi_model(&data["model"]);
// Pi always runs at some level; show which.
if let Some(effort) = data.get("thinkingLevel").and_then(Value::as_str).and_then(Effort::from_cli) {
self.reasoning = Reasoning::Level(effort);
}
if self.status == SessionStatus::Starting {
self.status = SessionStatus::Idle;
}
}
"set_model" => self.apply_pi_model(data),
"get_available_thinking_levels" => {
self.pi_efforts = data
.get("levels")
.and_then(Value::as_array)
.map(|levels| levels.iter().filter_map(Value::as_str).filter_map(Effort::from_cli).collect())
.unwrap_or_default();
}
"prompt" if data.get("disposition").and_then(Value::as_str) == Some("handled") => {
// An extension command consumed the prompt; no run follows.
self.status = SessionStatus::Idle;
self.turn_started = None;
self.base_snapshot = None;
}
_ => {}
}
}
fn apply_pi_model(&mut self, model: &Value) {
if let (Some(provider), Some(id)) =
(model.get("provider").and_then(Value::as_str), model.get("id").and_then(Value::as_str))
{
self.active_model = Some(format!("{provider}/{id}"));
if self.model.is_none() {
self.model = self.active_model.clone();
}
}
if let Some(window) = model.get("contextWindow").and_then(Value::as_u64) {
self.context_window = Some(window);
}
}
fn handle_pi_update(&mut self, event: &Value, cx: &mut Context<Self>) {
let index = event.get("contentIndex").and_then(Value::as_u64).unwrap_or(0);
if self.streaming.is_none() {
self.streaming = Some(StreamingMessage { blocks: HashMap::new() });
}
match event.get("type").and_then(Value::as_str) {
Some("text_start") => {
let ix = self.push_assistant_text("", cx);
self.map_block(index, ix);
}
Some("text_delta") => {
let delta = event.get("delta").and_then(Value::as_str).unwrap_or_default();
let ix = match self.streamed_item(index) {
Some(ix) => ix,
None => {
let ix = self.push_assistant_text("", cx);
self.map_block(index, ix);
ix
}
};
self.append_text(ix, delta, cx);
}
Some("text_end") => {
if let Some(ix) = self.streamed_item(index) {
self.flush_item(ix, cx);
}
}
Some("thinking_start" | "thinking_delta") => self.thinking = true,
Some("thinking_end") => self.thinking = false,
Some("toolcall_start") => {
let id = event.get("id").and_then(Value::as_str).unwrap_or_default();
let name = event.get("toolName").and_then(Value::as_str).unwrap_or("tool");
let ix = self.push_tool(id, name, Value::Null);
self.map_block(index, ix);
}
Some("toolcall_delta") => {
let delta = event.get("delta").and_then(Value::as_str).unwrap_or_default();
if let Some(ChatItem::Tool(tool)) = self.streamed_item(index).and_then(|ix| self.items.get_mut(ix)) {
tool.partial_input.push_str(delta);
}
}
Some("toolcall_end") => {
let call = &event["toolCall"];
let id = call.get("id").and_then(Value::as_str).unwrap_or_default();
let arguments = call.get("arguments").cloned().unwrap_or(Value::Null);
match self.find_tool_mut(id) {
Some(tool) => tool.input = arguments,
None => {
let name = call.get("name").and_then(Value::as_str).unwrap_or("tool");
self.push_tool(id, name, arguments);
}
}
}
_ => {}
}
}
fn map_block(&mut self, index: u64, ix: usize) {
if let Some(streaming) = self.streaming.as_mut() {
streaming.blocks.insert(index, ix);
}
}
/// Dialogs Pi extensions open. Confirms and selects become questions in
/// the transcript; free-text input isn't supported yet and is declined.
fn handle_pi_ui(&mut self, message: &Value) {
let id = message.get("id").and_then(Value::as_str).unwrap_or_default().to_string();
let text = |key: &str| message.get(key).and_then(Value::as_str).map(|text| SharedString::from(text.to_string()));
match message.get("method").and_then(Value::as_str) {
Some("confirm") => self.items.push(ChatItem::Question(Question {
request_id: id,
title: text("title").unwrap_or_else(|| "Confirm".into()),
message: text("message"),
options: vec!["Yes".into(), "No".into()],
confirm: true,
answer: None,
})),
Some("select") => self.items.push(ChatItem::Question(Question {
request_id: id,
title: text("title").unwrap_or_else(|| "Choose".into()),
message: None,
options: message
.get("options")
.and_then(Value::as_array)
.map(|options| {
options.iter().filter_map(Value::as_str).map(|option| option.to_string().into()).collect()
})
.unwrap_or_default(),
confirm: false,
answer: None,
})),
Some("input" | "editor") => {
if let Some(process) = &self.process {
process.send(json!({"type": "extension_ui_response", "id": id, "cancelled": true}));
}
let title = text("title").unwrap_or_default();
self.push_notice(
NoticeKind::Info,
format!("A Pi extension asked for text ({title}); that isn't supported here yet."),
);
}
Some("notify") => {
let kind = match message.get("notifyType").and_then(Value::as_str) {
Some("error") => NoticeKind::Error,
_ => NoticeKind::Info,
};
if let Some(text) = text("message") {
self.push_notice(kind, text);
}
}
_ => {}
}
self.updated = SystemTime::now();
}
// ---- helpers -----------------------------------------------------
fn push_assistant_text(&mut self, text: &str, cx: &mut Context<Self>) -> usize {
let view = cx.new(|cx| TextViewState::markdown(text, cx).selectable(true));
self.items.push(ChatItem::Assistant(AssistantText { text: text.to_string(), view, shown: text.len() }));
self.items.len() - 1
}
/// Adds streamed text to an answer. With "Show finished paragraphs" on,
/// the view only takes whole paragraphs and code blocks.
fn append_text(&mut self, ix: usize, delta: &str, cx: &mut Context<Self>) {
let paragraphs = settings::get(|settings| settings.streaming == Streaming::Paragraphs);
let Some(ChatItem::Assistant(answer)) = self.items.get_mut(ix) else { return };
answer.text.push_str(delta);
let target = if paragraphs { finished_prefix(&answer.text) } else { answer.text.len() };
answer.show(target, cx);
}
/// Shows the rest of an answer's text.
fn flush_item(&mut self, ix: usize, cx: &mut Context<Self>) {
if let Some(ChatItem::Assistant(answer)) = self.items.get_mut(ix) {
let end = answer.text.len();
answer.show(end, cx);
}
}
fn flush_text(&mut self, cx: &mut Context<Self>) {
for ix in 0..self.items.len() {
self.flush_item(ix, cx);
}
}
fn push_tool(&mut self, id: &str, name: &str, input: Value) -> usize {
self.items.push(ChatItem::Tool(ToolCall {
id: id.to_string(),
name: name.to_string(),
input,
partial_input: String::new(),
result: None,
state: ToolState::Running,
permission: None,
expanded: false,
subagent_tool_count: 0,
detached: false,
}));
self.items.len() - 1
}
fn push_notice(&mut self, kind: NoticeKind, text: impl Into<SharedString>) {
self.items.push(ChatItem::Notice(kind, text.into()));
}
fn find_tool_mut(&mut self, id: &str) -> Option<&mut ToolCall> {
if id.is_empty() {
return None;
}
self.items.iter_mut().rev().find_map(|item| match item {
ChatItem::Tool(tool) if tool.id == id => Some(tool),
_ => None,
})
}
fn cancel_permission(&mut self, request_id: &str) {
for item in &mut self.items {
if let ChatItem::Tool(ToolCall { permission: Some(prompt), .. }) = item
&& prompt.request_id == request_id
&& prompt.state == PermissionState::Pending
{
prompt.state = PermissionState::Cancelled;
}
}
}
fn cancel_pending_permissions(&mut self) {
for item in &mut self.items {
if let ChatItem::Tool(ToolCall { permission: Some(prompt), .. }) = item
&& prompt.state == PermissionState::Pending
{
prompt.state = PermissionState::Cancelled;
}
}
}
fn cancel_pending_questions(&mut self) {
for item in &mut self.items {
if let ChatItem::Question(question) = item
&& question.answer.is_none()
{
question.answer = Some("No answer".into());
}
}
}
fn finish_open_tools(&mut self, reason: &str) {
for item in &mut self.items {
if let ChatItem::Tool(tool) = item
&& tool.state == ToolState::Running
{
tool.state = ToolState::Error;
tool.result.get_or_insert_with(|| reason.to_string());
}
}
}
}
// ---- saving and restoring ----------------------------------------------
/// A thread as it's kept on disk between runs of the app.
#[derive(Serialize, Deserialize)]
pub struct SavedThread {
pub id: String,
pub instance: String,
pub provider: Provider,
pub title: String,
#[serde(default)]
pub title_custom: bool,
pub project: PathBuf,
pub cwd: PathBuf,
#[serde(default)]
pub worktree: Option<Worktree>,
#[serde(default)]
pub pending_worktree: Option<WorktreePlan>,
#[serde(default)]
pub pull_request: Option<PullRequest>,
pub resume_id: Option<String>,
pub model: Option<String>,
pub active_model: Option<String>,
pub permission_mode: String,
pub reasoning: String,
pub fast_mode: bool,
pub total_cost: f64,
pub context_tokens: Option<u64>,
pub context_window: Option<u64>,
/// Milliseconds since the epoch, like every time below.
pub created: u64,
pub updated: u64,
pub last_message: u64,
pub settled: bool,
pub pinned: bool,
pub snoozed_until: Option<u64>,
pub limit_resets: Option<u64>,
pub resume_at: Option<u64>,
pub queue: Vec<QueuedMessage>,
/// The agent was mid-turn when the thread was saved.
pub working: bool,
pub items: Vec<SavedItem>,
/// What each finished turn changed, by its `TurnEnd` index.
pub turn_changes: Vec<(usize, TurnChanges)>,
}
#[derive(Serialize, Deserialize)]
#[serde(tag = "type", rename_all = "snake_case")]
pub enum SavedItem {
User { text: String, attachments: Vec<String>, at: u64 },
Assistant { text: String },
Tool {
id: String,
name: String,
input: Value,
result: Option<String>,
/// `done` or `error`; a tool still running when saved counts as failed.
state: String,
/// `allowed`, `denied` or `cancelled`, if it asked for permission.
permission: Option<String>,
subagent_tool_count: usize,
},
Notice { error: bool, text: String },
Question { title: String, message: Option<String>, options: Vec<String>, answer: Option<String> },
TurnEnd { duration_ms: u64, cost: Option<f64>, at: u64 },
}
pub fn to_millis(time: SystemTime) -> u64 {
time.duration_since(UNIX_EPOCH).unwrap_or_default().as_millis() as u64
}
pub fn from_millis(millis: u64) -> SystemTime {
UNIX_EPOCH + Duration::from_millis(millis)
}
impl Session {
pub fn save(&self) -> SavedThread {
let items = self
.items
.iter()
.map(|item| match item {
ChatItem::User { text, attachments, at } => SavedItem::User {
text: text.to_string(),
attachments: attachments.iter().map(ToString::to_string).collect(),
at: to_millis(*at),
},
ChatItem::Assistant(answer) => SavedItem::Assistant { text: answer.text.clone() },
ChatItem::Tool(tool) => SavedItem::Tool {
id: tool.id.clone(),
name: tool.name.clone(),
input: tool.input.clone(),
result: tool.result.clone(),
state: if tool.state == ToolState::Done { "done" } else { "error" }.into(),
permission: tool.permission.as_ref().map(|prompt| {
match prompt.state {
PermissionState::Allowed => "allowed",
PermissionState::Denied => "denied",
PermissionState::Pending | PermissionState::Cancelled => "cancelled",
}
.into()
}),
subagent_tool_count: tool.subagent_tool_count,
},
ChatItem::Notice(kind, text) => {
SavedItem::Notice { error: *kind == NoticeKind::Error, text: text.to_string() }
}
ChatItem::Question(question) => SavedItem::Question {
title: question.title.to_string(),
message: question.message.as_ref().map(ToString::to_string),
options: question.options.iter().map(ToString::to_string).collect(),
answer: question.answer.as_ref().map(ToString::to_string),
},
ChatItem::TurnEnd { duration_ms, cost, at } => {
SavedItem::TurnEnd { duration_ms: *duration_ms, cost: *cost, at: to_millis(*at) }
}
})
.collect();
SavedThread {
id: self.id.clone(),
instance: self.instance.clone(),
provider: self.provider,
title: self.title.to_string(),
title_custom: self.title_custom,
project: self.project.clone(),
cwd: self.cwd.clone(),
worktree: self.worktree.clone(),
pending_worktree: self.pending_worktree.clone(),
pull_request: self.pull_request.clone(),
resume_id: self.resume_id.clone(),
model: self.model.clone(),
active_model: self.active_model.clone(),
permission_mode: self.permission_mode.as_cli().into(),
reasoning: self.reasoning.key().into(),
fast_mode: self.fast_mode,
total_cost: self.total_cost,
context_tokens: self.context_tokens,
context_window: self.context_window,
created: to_millis(self.created),
updated: to_millis(self.updated),
last_message: to_millis(self.last_message),
settled: self.settled,
pinned: self.pinned,
snoozed_until: self.snoozed_until.map(to_millis),
limit_resets: self.limit_resets.map(to_millis),
resume_at: self.resume_at.map(to_millis),
queue: self.queue.clone(),
working: self.is_working(),
items,
turn_changes: self.turn_changes.iter().map(|(end, changes)| (*end, changes.clone())).collect(),
}
}
/// Brings a saved thread back. Its agent starts again, resuming the
/// conversation, with the next message.
pub fn restore(saved: SavedThread, cx: &mut Context<Self>) -> Self {
let new = NewSession {
instance: saved.instance,
provider: saved.provider,
project: saved.project,
model: saved.model,
permission_mode: PermissionMode::from_cli(&saved.permission_mode).unwrap_or_default(),
reasoning: Reasoning::from_key(&saved.reasoning).unwrap_or_default(),
fast_mode: saved.fast_mode,
worktree: saved.pending_worktree,
};
let mut session = Self::empty(saved.id, new, from_millis(saved.created));
session.status = SessionStatus::Idle;
session.title = saved.title.into();
session.title_custom = saved.title_custom;
session.cwd = saved.cwd;
session.worktree = saved.worktree;
session.pull_request = saved.pull_request;
session.resume_id = saved.resume_id;
session.active_model = saved.active_model;
session.total_cost = saved.total_cost;
session.context_tokens = saved.context_tokens;
session.context_window = saved.context_window;
session.updated = from_millis(saved.updated);
session.last_message = from_millis(saved.last_message);
session.settled = saved.settled;
session.pinned = saved.pinned;
session.snoozed_until = saved.snoozed_until.map(from_millis);
session.limit_resets = saved.limit_resets.map(from_millis);
session.resume_at = saved.resume_at.map(from_millis);
session.queue = saved.queue;
session.interrupted = saved.working;
session.turn_changes = saved.turn_changes.into_iter().collect();
for item in saved.items {
let item = match item {
SavedItem::User { text, attachments, at } => ChatItem::User {
text: text.into(),
attachments: attachments.into_iter().map(Into::into).collect(),
at: from_millis(at),
},
SavedItem::Assistant { text } => {
session.push_assistant_text(&text, cx);
continue;
}
SavedItem::Tool { id, name, input, result, state, permission, subagent_tool_count } => {
ChatItem::Tool(ToolCall {
id,
name,
input,
partial_input: String::new(),
result,
state: if state == "done" { ToolState::Done } else { ToolState::Error },
permission: permission.map(|state| PermissionPrompt {
request_id: String::new(),
input: Value::Null,
suggestions: Vec::new(),
state: match state.as_str() {
"allowed" => PermissionState::Allowed,
"denied" => PermissionState::Denied,
_ => PermissionState::Cancelled,
},
}),
expanded: false,
subagent_tool_count,
detached: false,
})
}
SavedItem::Notice { error, text } => {
ChatItem::Notice(if error { NoticeKind::Error } else { NoticeKind::Info }, text.into())
}
SavedItem::Question { title, message, options, answer } => ChatItem::Question(Question {
request_id: String::new(),
title: title.into(),
message: message.map(Into::into),
options: options.into_iter().map(Into::into).collect(),
confirm: false,
answer: Some(answer.unwrap_or_else(|| "No answer".into()).into()),
}),
SavedItem::TurnEnd { duration_ms, cost, at } => {
ChatItem::TurnEnd { duration_ms, cost, at: from_millis(at) }
}
};
session.items.push(item);
}
if session.interrupted {
session.push_notice(NoticeKind::Info, "The app stopped while this thread was working.");
}
session
}
}
impl Drop for Session {
fn drop(&mut self) {
let _ = std::fs::remove_file(&self.snapshot_index);
}
}
fn image_media_type(path: &Path) -> Option<&'static str> {
let extension = path.extension()?.to_str()?.to_ascii_lowercase();
match extension.as_str() {
"png" => Some("image/png"),
"jpg" | "jpeg" => Some("image/jpeg"),
"gif" => Some("image/gif"),
"webp" => Some("image/webp"),
_ => None,
}
}
fn read_image(path: &Path) -> Result<String, String> {
let size = path.metadata().map_err(|err| err.to_string())?.len();
if size > MAX_IMAGE_BYTES {
return Err(format!("it is {:.1} MB, over the 5 MB limit for images", size as f64 / 1_048_576.));
}
let bytes = std::fs::read(path).map_err(|err| err.to_string())?;
Ok(BASE64.encode(bytes))
}
impl AssistantText {
/// Moves the view up to `end` bytes of the text.
fn show(&mut self, end: usize, cx: &mut App) {
if end > self.shown && self.text.is_char_boundary(end) {
let new = self.text[self.shown..end].to_string();
self.view.update(cx, |state, cx| state.push_str(&new, cx));
self.shown = end;
}
}
}
/// How much of streamed Markdown is finished: up to the last blank line
/// outside a code block, or the end of the last closed code block.
fn finished_prefix(text: &str) -> usize {
let mut fence: Option<&str> = None;
let mut finished = 0;
let mut offset = 0;
for line in text.split_inclusive('\n') {
offset += line.len();
if !line.ends_with('\n') {
break;
}
let trimmed = line.trim();
let marker = ["```", "~~~"].into_iter().find(|marker| trimmed.starts_with(marker));
match (fence, marker) {
(None, Some(marker)) => fence = Some(marker),
(Some(open), Some(marker)) if open == marker && trimmed.trim_start_matches(marker).is_empty() => {
fence = None;
finished = offset;
}
(None, None) if trimmed.is_empty() => finished = offset,
_ => {}
}
}
finished
}
fn file_name(path: &Path) -> String {
path.file_name().map(|name| name.to_string_lossy().to_string()).unwrap_or_else(|| path.display().to_string())
}
fn title_from(text: &str) -> String {
let line = text.lines().find(|line| !line.trim().is_empty()).unwrap_or(text).trim();
let mut title: String = line.chars().take(48).collect();
if line.chars().count() > 48 {
title.push('…');
}
title
}
fn tool_result_text(content: &Value) -> String {
match content {
Value::String(text) => text.clone(),
Value::Array(blocks) => blocks
.iter()
.filter_map(|block| match block.get("type").and_then(Value::as_str) {
Some("text") => block.get("text").and_then(Value::as_str).map(str::to_string),
Some("image") => Some("[image]".to_string()),
_ => None,
})
.collect::<Vec<_>>()
.join("\n"),
Value::Null => String::new(),
other => other.to_string(),
}
}
/// Reads the first of several possible argument names: Claude and Pi name
/// the same tool arguments differently (`file_path` vs `path`).
pub fn tool_field(input: &Value, keys: &[&str]) -> Option<String> {
keys.iter().find_map(|key| input.get(*key).and_then(Value::as_str)).map(str::to_string)
}
/// A one-line description of what a tool call is doing.
pub fn tool_summary(name: &str, input: &Value, cwd: &std::path::Path) -> String {
let field = |keys: &[&str]| tool_field(input, keys);
let path = |keys: &[&str]| {
field(keys).map(|path| {
std::path::Path::new(&path)
.strip_prefix(cwd)
.map(|relative| relative.display().to_string())
.unwrap_or(path)
})
};
let summary = match name.to_ascii_lowercase().as_str() {
"bash" => field(&["command"]),
"read" | "write" | "edit" | "multiedit" => path(&["file_path", "path"]),
"notebookedit" => path(&["notebook_path"]),
"glob" | "grep" | "find" => field(&["pattern", "query"]),
"ls" => path(&["path"]),
"webfetch" => field(&["url"]),
"websearch" => field(&["query"]),
"task" | "agent" => field(&["description"]),
"todowrite" => input
.get("todos")
.and_then(Value::as_array)
.map(|todos| format!("{} items", todos.len())),
"exitplanmode" => Some("Plan ready for review".to_string()),
_ => None,
};
let summary = summary.unwrap_or_else(|| match input {
Value::Null => String::new(),
Value::Object(map) if map.is_empty() => String::new(),
other => other.to_string(),
});
let first_line = summary.lines().next().unwrap_or_default();
let mut line: String = first_line.chars().take(160).collect();
if first_line.chars().count() > 160 || summary.lines().nth(1).is_some() {
line.push('…');
}
line
}
#[cfg(test)]
mod tests {
use super::finished_prefix;
#[::core::prelude::v1::test]
fn finished_paragraphs() {
assert_eq!(finished_prefix("Half a sent"), 0);
assert_eq!(finished_prefix("One.\n\nTwo is still"), "One.\n\n".len());
let open_fence = "Intro.\n\n```rust\nfn a() {}\n\nfn b";
assert_eq!(finished_prefix(open_fence), "Intro.\n\n".len());
let closed = "```rust\nfn a() {}\n```\nAfter";
assert_eq!(finished_prefix(closed), "```rust\nfn a() {}\n```\n".len());
assert_eq!(finished_prefix("Ünïcödé.\n\nMore"), "Ünïcödé.\n\n".len());
}
}