fontfor 0.4.1

find fonts which can show a specified character and preview them in terminal or browser
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// FontFor: find fonts which can show a specified character
// Copyright (C) 2019 - 2023 7sDream <i@7sdre.am> and contributors
//
// This file is part of FontFor.
//
// FontFor is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

use std::{io::Result as IoResult, ops::Deref, sync::mpsc, thread, time::Duration};

use crossterm::event::{self, Event, KeyEvent, KeyEventKind};

#[derive(Copy, Clone)]
pub enum TerminalEvent {
    Tick,
    Key(KeyEvent),
}

pub struct TerminalEventStream {
    rx: mpsc::Receiver<IoResult<TerminalEvent>>,
}

impl TerminalEventStream {
    pub fn new(tick_interval: Duration) -> Self {
        let (tx, rx) = mpsc::channel();

        let keyboard_tx = tx;
        thread::spawn(move || keyboard_event_generator(tick_interval, keyboard_tx));

        Self { rx }
    }
}

impl Deref for TerminalEventStream {
    type Target = mpsc::Receiver<IoResult<TerminalEvent>>;

    fn deref(&self) -> &Self::Target {
        &self.rx
    }
}

fn keyboard_event_generator(tick_interval: Duration, tx: mpsc::Sender<IoResult<TerminalEvent>>) {
    loop {
        match event::poll(tick_interval) {
            Ok(true) => {
                let ev = event::read().expect("read terminal event should not fail");
                if let Event::Key(key) = ev {
                    #[allow(clippy::collapsible_if)]
                    if key.kind != KeyEventKind::Release {
                        if tx.send(Ok(TerminalEvent::Key(key))).is_err() {
                            break;
                        }
                    }
                }
            }
            Ok(false) => {
                if tx.send(Ok(TerminalEvent::Tick)).is_err() {
                    break;
                }
            }
            Err(kind) => {
                if tx.send(Err(kind)).is_err() {
                    break;
                }
            }
        }
    }
}