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use std::{
io,
time::Duration,
};
use crossterm::{
event,
event::Event,
execute,
terminal::{
EnterAlternateScreen,
LeaveAlternateScreen,
disable_raw_mode,
enable_raw_mode,
},
};
use ratatui::{
Terminal,
backend::CrosstermBackend,
};
use crate::app::App;
/// Process a single crossterm event and return `Ok(true)` if the app should
/// exit.
#[allow(dead_code)]
pub fn process_event(
app: &mut App,
ev: Event,
) -> io::Result<bool>
{
match ev
{
Event::Key(key) => crate::input::handle_key(app, key),
Event::Resize(_, _) => Ok(false),
_ => Ok(false),
}
}
pub fn run_app(app: &mut App) -> Result<(), Box<dyn std::error::Error>>
{
enable_raw_mode()?;
let mut stdout = io::stdout();
execute!(stdout, EnterAlternateScreen)?;
let backend = CrosstermBackend::new(stdout);
let mut terminal = Terminal::new(backend)?;
terminal.clear()?;
// Ensure we always restore the terminal even if an error occurs during
// event handling
let res: Result<(), Box<dyn std::error::Error>> = {
let mut result: Result<(), Box<dyn std::error::Error>> = Ok(());
loop
{
// Drain any running preview process output into the preview buffer
if let Some(ref rp) = app.running_preview
{
while let Ok(opt) = rp.rx.try_recv()
{
match opt
{
Some(line) =>
{
app.preview
.static_lines
.push(crate::util::sanitize_line(&line));
// Trim to a reasonable bound to avoid unbounded
// growth
if app.preview.static_lines.len() > 2000
{
let _ = app.preview.static_lines.drain(
0..app.preview.static_lines.len() - 2000,
);
}
}
None =>
{
app.running_preview = None;
// Recompute normal preview for current selection
app.refresh_preview();
break;
}
}
}
}
if app.force_full_redraw
{
let _ = terminal.clear();
app.force_full_redraw = false;
}
if let Err(e) = terminal.draw(|f| crate::ui::draw(f, app))
{
// Log draw errors with a backtrace for diagnostics
let bt = std::backtrace::Backtrace::force_capture();
crate::trace::log(format!("[runtime] draw error: {}", e));
crate::trace::log(format!("[runtime] backtrace:\n{}", bt));
result = Err(e.into());
break;
}
match crossterm::event::poll(Duration::from_millis(200))
{
Ok(true) => match event::read()
{
Ok(Event::Key(key)) =>
{
match crate::input::handle_key(app, key)
{
Ok(true) => break, // graceful exit
Ok(false) =>
{}
Err(e) =>
{
let bt =
std::backtrace::Backtrace::force_capture();
crate::trace::log(format!(
"[runtime] input error: {}",
e
));
crate::trace::log(format!(
"[runtime] backtrace:\n{}",
bt
));
result = Err(e.into());
break;
}
}
}
Ok(Event::Resize(_, _)) =>
{}
Ok(_) =>
{}
Err(e) =>
{
let bt = std::backtrace::Backtrace::force_capture();
crate::trace::log(format!(
"[runtime] event read error: {}",
e
));
crate::trace::log(format!(
"[runtime] backtrace:\n{}",
bt
));
result = Err(e.into());
break;
}
},
Ok(false) =>
{}
Err(e) =>
{
let bt = std::backtrace::Backtrace::force_capture();
crate::trace::log(format!("[runtime] poll error: {}", e));
crate::trace::log(format!("[runtime] backtrace:\n{}", bt));
result = Err(e.into());
break;
}
}
}
result
};
disable_raw_mode()?;
execute!(terminal.backend_mut(), LeaveAlternateScreen)?;
terminal.show_cursor()?;
// Clear caches tied to this session
crate::ui::clear_owner_cache();
res
}