yclip 0.4.3

A cross-platform clipboard syncer
Documentation 
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use objc2_app_kit::NSPasteboard;
use std::sync::Arc;
use std::time::Duration;
use tokio::sync::Notify;

pub struct Listener {
    notify: Arc<Notify>,
}

impl Listener {
    pub fn new() -> anyhow::Result<Self> {
        let notify = Arc::new(Notify::const_new());
        let dupe = Arc::clone(&notify);

        let poll_interval = match std::env::var("YCLIP_MACOS_POLL_INTERVAL_MILLIS") {
            Ok(s) => Duration::from_millis(s.trim().parse()?),
            Err(std::env::VarError::NotPresent) => Duration::from_millis(200),
            Err(e) => return Err(e.into()),
        };
        std::thread::spawn(move || listen_clipboard(dupe, poll_interval));

        Ok(Self { notify })
    }

    pub async fn change(&self) -> anyhow::Result<()> {
        Ok(self.notify.notified().await)
    }
}

pub fn listen_clipboard(notify: Arc<Notify>, poll_interval: Duration) -> anyhow::Result<()> {
    unsafe {
        let board = NSPasteboard::generalPasteboard();
        let mut count = board.changeCount();

        loop {
            let new_count = board.changeCount();
            if new_count != count {
                notify.notify_one();
                count = new_count;
            }
            std::thread::sleep(poll_interval);
        }
    }
}