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//! Event loop, effect runner, terminal lifecycle.
use std::io;
use std::time::{Duration, Instant};
use ratatui::backend::CrosstermBackend;
use ratatui::crossterm::{
execute,
terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
};
use ratatui::Terminal;
use super::effect::Effect;
use super::keys;
use super::msg::Msg;
use super::state::{Modal, State};
use super::update::update;
use super::view;
pub type Term = Terminal<CrosstermBackend<io::Stdout>>;
pub fn enter_tui() -> io::Result<Term> {
enable_raw_mode()?;
let mut out = io::stdout();
// No EnableMouseCapture: we don't consume mouse events, and capturing
// them would block the terminal's native text selection — which is how
// the user copies the cache path out of the details pane.
execute!(out, EnterAlternateScreen)?;
Terminal::new(CrosstermBackend::new(out))
}
pub fn leave_tui(term: &mut Term) -> io::Result<()> {
let _ = disable_raw_mode();
let _ = execute!(term.backend_mut(), LeaveAlternateScreen);
let _ = term.show_cursor();
Ok(())
}
struct EffectRunner {
msg_tx: std::sync::mpsc::Sender<Msg>,
}
impl EffectRunner {
fn run(&self, eff: Effect) {
let tx = self.msg_tx.clone();
match eff {
Effect::SpawnScan {
parent_label,
parent_path,
} => {
std::thread::spawn(move || {
// Same throttled folder-count stream as LoadSeeds so the
// spinner reads identically for drill-in scans.
const PROGRESS_EVERY: usize = 200;
let mut total = 0usize;
let progress_tx = tx.clone();
let children = crate::caches::scan::enumerate_seed_with_progress(
&parent_path,
&mut || {
total += 1;
if total.is_multiple_of(PROGRESS_EVERY) {
let _ = progress_tx.send(Msg::ScanProgress { folders: total });
}
},
);
let _ = tx.send(Msg::ScanProgress { folders: total });
let _ = tx.send(Msg::ScanCompleted {
parent_label,
parent_path,
children,
});
});
}
Effect::SpawnRefresh { path } => {
std::thread::spawn(move || {
let cache = crate::caches::scan::stat_dir(&path);
let _ = tx.send(Msg::RefreshCompleted { path, cache });
});
}
Effect::SpawnDelete { items, dry_run } => {
std::thread::spawn(move || {
use crate::cleaner::{Clean, DoCleanUp, DryRunCleaner, ProperCleaner};
let cleaner: Box<dyn DoCleanUp> = if dry_run {
Box::new(DryRunCleaner)
} else {
Box::new(ProperCleaner)
};
let mut freed = 0u64;
let mut deleted_count = 0usize;
let mut failed_count = 0usize;
let mut deleted_indices: Vec<usize> = Vec::new();
for (idx, path, size) in &items {
match cleaner.do_cleanup(path) {
Ok(Clean::Cleaned) => {
freed += *size;
deleted_count += 1;
deleted_indices.push(*idx);
}
Ok(Clean::NotCleaned) => {
freed += *size;
deleted_count += 1;
}
Err(_) => {
failed_count += 1;
}
}
}
let _ = tx.send(Msg::DeleteCompleted {
freed,
deleted_count,
failed_count,
deleted_indices,
});
});
}
Effect::EmitAfter { dur, msg } => {
std::thread::spawn(move || {
std::thread::sleep(dur);
let _ = tx.send(msg);
});
}
Effect::LoadSeeds { seeds } => {
std::thread::spawn(move || {
// Stream folder counts back so the spinner shows progress
// instead of just elapsed time. Throttle to roughly once
// per 200 directories so we don't spam the channel.
const PROGRESS_EVERY: usize = 200;
let mut total = 0usize;
let progress_tx = tx.clone();
let caches = crate::caches::scan::collect_with_progress(&seeds, &mut || {
total += 1;
if total.is_multiple_of(PROGRESS_EVERY) {
let _ = progress_tx.send(Msg::ScanProgress { folders: total });
}
});
// Flush the final count and the completed list.
let _ = tx.send(Msg::ScanProgress { folders: total });
let _ = tx.send(Msg::SeedsLoaded { caches });
});
}
}
}
}
fn step(state: State, msg: Msg, runner: &EffectRunner) -> State {
let (mut state, mut cmd) = update(state, msg);
while !cmd.events.is_empty() {
let ev = cmd.events.remove(0);
let (next, more) = update(state, ev);
state = next;
cmd = cmd.and(more);
}
for eff in cmd.effects {
runner.run(eff);
}
state
}
pub fn run_loop(
term: &mut Term,
mut state: State,
initial_effects: Vec<Effect>,
) -> io::Result<(State, u64)> {
const FRAME_BUDGET: Duration = Duration::from_millis(33);
let (msg_tx, msg_rx) = std::sync::mpsc::channel::<Msg>();
let runner = EffectRunner {
msg_tx: msg_tx.clone(),
};
// Dispatch any boot-time effects (e.g. the initial seed scan) before the
// first render so their workers are already running while the spinner
// shows up.
for eff in initial_effects {
runner.run(eff);
}
loop {
let frame_start = Instant::now();
term.draw(|f| view::render(&mut state, f.area(), f.buffer_mut()))?;
if state.quit {
break;
}
let deadline = frame_start + FRAME_BUDGET;
let animating = state.loading.is_some() || state.overlay.is_some();
loop {
// Drain any queued background msgs eagerly without rendering between them.
if let Ok(m) = msg_rx.try_recv() {
state = step(state, m, &runner);
if state.quit {
break;
}
continue;
}
// Animating: stay inside the frame budget so the spinner ticks at 30 fps.
// Idle: long blocking poll, no redundant renders.
let poll_for = if animating {
deadline.saturating_duration_since(Instant::now())
} else {
Duration::from_millis(250)
};
match ratatui::crossterm::event::poll(poll_for) {
Ok(true) => match ratatui::crossterm::event::read() {
Ok(ratatui::crossterm::event::Event::Key(k))
if k.kind == ratatui::crossterm::event::KeyEventKind::Press =>
{
let modal = match &state.modal {
Modal::DeleteConfirm => keys::ModalKind::DeleteConfirm,
Modal::ActiveMark(_) => keys::ModalKind::ActiveMark,
Modal::FilterEdit => keys::ModalKind::FilterEdit,
Modal::None => keys::ModalKind::None,
};
if let Some(msg) = keys::key_to_msg(k, modal, state.focus_right) {
state = step(state, msg, &runner);
if state.quit {
break;
}
}
// Re-render after every keypress for snappy input → cursor latency.
break;
}
// Mouse / resize / focus events: re-render so layout updates apply.
Ok(_) => break,
Err(e) => return Err(e),
},
Ok(false) => {
if animating {
// Advance the spinner and render the next frame.
state = step(state, Msg::Tick, &runner);
break;
}
// Idle timeout, nothing changed — keep waiting; no re-render.
continue;
}
Err(e) => return Err(e),
}
}
}
let total = state.total_freed;
Ok((state, total))
}