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use std::sync::mpsc::{self, TryRecvError};
use std::sync::Arc;
use std::thread;
use std::time::Duration;
use anyhow::Result;
use crate::keybindings::REFRESH_EVENT;
/// Allows refresh if the current path has been modified externally.
pub struct Refresher {
/// Sender of messages, used to terminate the thread properly
tx: mpsc::Sender<()>,
/// Handle to the `term::Event` sender thread.
handle: thread::JoinHandle<()>,
}
impl Refresher {
/// Between 2 refreshed
const TEN_SECONDS_IN_DECISECONDS: u8 = 10 * 10;
/// Event sent to Fm event poller which is interpreted
/// as a request for refresh.
/// This key can't be bound to anything (who would use that ?).
/// Spawn a thread which sends events to the terminal.
/// Those events are interpreted as refresh requests.
/// It also listen to a receiver for quit messages.
///
/// This will send periodically an `Key::AltPageUp` event to the terminal which requires a refresh.
/// This keybind is reserved and can't be bound to anything.
///
/// Using Event::User(()) conflicts with skim internal which interpret this
/// event as a signal(1) and hangs the terminal.
pub fn new(term: Arc<tuikit::term::Term>) -> Self {
let (tx, rx) = mpsc::channel();
let mut counter: u8 = 0;
let handle = thread::spawn(move || loop {
match rx.try_recv() {
Ok(_) | Err(TryRecvError::Disconnected) => {
log::info!("terminating refresher");
let _ = term.show_cursor(true);
return;
}
Err(TryRecvError::Empty) => {}
}
counter += 1;
thread::sleep(Duration::from_millis(100));
if counter >= Self::TEN_SECONDS_IN_DECISECONDS {
counter = 0;
if term.send_event(REFRESH_EVENT).is_err() {
break;
}
}
});
Self { tx, handle }
}
/// Send a quit message to the receiver, signaling it to quit.
/// Join the refreshing thread which should be terminated.
pub fn quit(self) -> Result<()> {
self.tx.send(())?;
let _ = self.handle.join();
Ok(())
}
}
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