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//! TUI module with screen-based architecture.
//!
//! Each screen (home, chat) is self-contained with its own state, drawing,
//! and key handling. The top-level loop dispatches between screens based
//! on the Action returned by each.
pub mod chat;
pub mod completion;
pub mod home;
mod input;
pub mod markdown;
mod screen;
mod terminal;
mod tool_display;
mod ui;
use anyhow::Result;
use std::sync::Arc;
use crate::config::{Config, HookTrigger, ModelBinding, ProviderKind, ResolvedModel};
use crate::context;
use crate::db::Db;
use crate::plugin::PluginRegistry;
use crate::query::Engine;
use crate::theme::Theme;
use screen::Action;
use terminal::TerminalGuard;
/// Run the TUI application. Provider construction is deferred until a
/// session is opened so Home remains available without startup credentials.
pub async fn run(
config: &Config,
plugins: Arc<PluginRegistry>,
models: Vec<ResolvedModel>,
) -> Result<()> {
if models.is_empty() {
anyhow::bail!("no models configured; set `model` in ~/.config/claux/config.toml");
}
// Open database
let db_path = crate::session::db_path()?;
let db = Db::open(&db_path)?;
let shutdown = crate::shutdown::TuiShutdown::listen()?;
let tui_logs = crate::logging::TuiLogs::defer();
let mut terminal_guard = TerminalGuard::enter()?;
let theme = Theme::dark();
let mut engine: Option<Engine> = None;
let mut engine_binding: Option<ModelBinding> = None;
let mut home_notice = None;
let mut active_session = None;
let mut forced_shutdown = false;
let app_result: Result<()> = {
let run = async {
// Screen loop: home -> chat -> home -> ...
let mut next_action = Action::Home;
loop {
if shutdown.token.is_cancelled() {
return Ok(());
}
// Only the currently running chat owns unsaved engine state.
// Provider setup for a new session must not overwrite an old one.
active_session = None;
tracing::debug!("TUI action: {next_action:?}");
match next_action {
Action::Home => {
let mut home_screen =
home::HomeScreen::new(Db::open(&db_path)?, theme, models.clone());
if let Some(notice) = home_notice.take() {
home_screen.set_notice(notice);
}
next_action =
home_screen.run(terminal_guard.terminal_mut(), &shutdown.token)?;
}
Action::Chat { session_id } => {
let session = db.get_session(&session_id)?.ok_or_else(|| {
anyhow::anyhow!("session {session_id} no longer exists")
})?;
let resolved = match session.model_binding.as_ref() {
Some(binding) => config.resolve_binding(binding),
None => config.resolve_model(&session.model).map_err(|error| {
anyhow::anyhow!(
"Legacy session '{}' uses model '{}': {error}",
session.id,
session.model
)
}),
};
let resolved = match resolved {
Ok(resolved) => resolved,
Err(error) => {
home_notice = Some(format!(
"Cannot open '{}': {error}. Restore its profile or create a new chat.",
session.name.as_deref().unwrap_or(&session.id)
));
next_action = Action::Home;
continue;
}
};
if engine_binding.as_ref() != Some(&resolved.binding) {
match crate::build_engine(config, &resolved, plugins.clone()).await {
Ok(new_engine) => {
engine = Some(new_engine);
engine_binding = Some(resolved.binding.clone());
}
Err(error) => {
home_notice = Some(format!(
"Cannot open '{}': {error}",
session.name.as_deref().unwrap_or(&session.id)
));
next_action = Action::Home;
continue;
}
}
}
let engine = engine.as_mut().expect("engine initialized");
let system_prompt = context::build_system_prompt_for_model(
&resolved.binding.model,
Some(&plugins),
&HookTrigger::OnContextBuild,
resolved.binding.provider_kind == ProviderKind::Anthropic,
config.is_project_trusted(),
)
.await?;
engine.set_system_prompt(system_prompt);
active_session = Some(session_id.clone());
next_action = chat::run(
engine,
&session_id,
&db,
terminal_guard.terminal_mut(),
theme,
&models,
&shutdown.token,
)
.await?;
engine_binding = engine.model_binding().cloned();
}
Action::SwitchModel {
session_id,
selector,
} => {
let session = db.get_session(&session_id)?.ok_or_else(|| {
anyhow::anyhow!("session {session_id} no longer exists")
})?;
match config.resolve_model(&selector) {
Ok(resolved) => {
match crate::build_engine(config, &resolved, plugins.clone()).await
{
Ok(new_engine) => {
// Only persist the selection after its
// provider and credentials validate. A
// typo or unavailable key must not strand
// an otherwise usable saved session.
db.update_session_binding(&session_id, &resolved.binding)?;
engine = Some(new_engine);
engine_binding = Some(resolved.binding);
next_action = Action::Chat { session_id };
}
Err(error) => {
home_notice = Some(format!(
"Cannot switch '{}': {error}",
session.name.as_deref().unwrap_or(&session.id)
));
next_action = Action::Home;
}
}
}
Err(error) => {
home_notice = Some(format!(
"Cannot switch '{}': {error}",
session.name.as_deref().unwrap_or(&session.id)
));
next_action = Action::Home;
}
}
}
Action::Quit => return Ok(()),
}
}
};
tokio::pin!(run);
tokio::select! {
result = &mut run => result,
_ = shutdown.token.cancelled() => {
match tokio::time::timeout(std::time::Duration::from_secs(5), &mut run).await {
Ok(result) => result,
Err(_) => {
forced_shutdown = true;
Err(anyhow::anyhow!("Shutdown did not complete within five seconds."))
}
}
}
}
};
let restore_result = terminal_guard.restore();
// Drop the guard before flushing diagnostics, including on restore errors.
drop(terminal_guard);
drop(tui_logs);
if forced_shutdown {
if let Some(engine) = &engine {
engine.jobs().shutdown().await;
}
}
if forced_shutdown || app_result.is_err() {
if let (Some(session_id), Some(engine)) = (&active_session, &engine) {
let messages = crate::session::repair_history(engine.messages().to_vec());
if let Err(error) = db.save_snapshot(session_id, &messages, engine.model_binding()) {
match crate::session::write_recovery(session_id, &messages, engine.model_binding()) {
Ok(path) => eprintln!("Session save failed: {error}. Recovery JSON saved to {}. Copy it somewhere permanent; temporary files may be cleaned up.", path.display()),
Err(recovery_error) => eprintln!("Session save failed: {error}. Recovery export also failed: {recovery_error}. Unsaved messages could not be preserved."),
}
}
}
}
app_result?;
restore_result?;
if let Some(engine) = engine {
println!("{}", engine.cost.format_summary());
}
Ok(())
}