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use std::sync::mpsc::{self, Sender, TryRecvError};
use std::sync::Arc;
use std::thread;
use std::time::Duration;
use crate::event::FmEvents;
/// 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_CENTISECONDS: u16 = 10 * 100;
/// Event sent to Fm event poller which is interpreted
/// as a request for refresh.
///
/// 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.
pub fn new(fm_sender: Arc<Sender<FmEvents>>) -> Self {
let (tx, rx) = mpsc::channel();
// let mut counter: u16 = 0;
let mut counter = Counter::default();
let handle = thread::spawn(move || loop {
match rx.try_recv() {
Ok(_) | Err(TryRecvError::Disconnected) => {
return;
}
Err(TryRecvError::Empty) => {}
}
counter.incr();
thread::sleep(Duration::from_millis(10));
let event = counter.pick_according_to_counter();
if fm_sender.send(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) {
let _ = self.tx.send(());
let _ = self.handle.join();
}
}
#[derive(Default)]
struct Counter {
counter: u16,
}
impl Counter {
fn pick_according_to_counter(&mut self) -> FmEvents {
if self.counter >= Refresher::TEN_SECONDS_IN_CENTISECONDS {
self.counter = 0;
FmEvents::Refresh
} else {
FmEvents::UpdateTick
}
}
fn incr(&mut self) {
self.counter += 1;
}
}