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use libc::{termios, winsize};
use std::error::Error;
use std::io::{stdin, stdout, Read, Write};
use std::sync::mpsc::{Receiver, SyncSender, TryRecvError};
pub fn move_cursor(row: u16, col: u16) -> Result<(), Box<dyn Error>> {
write!(stdout(), "\x1b[{};{}H", row + 1, col + 1)?;
Ok(())
}
pub fn clear() -> Result<(), Box<dyn Error>> {
write!(stdout(), "\x1b[2J")?;
Ok(())
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Key {
Up,
Down,
Left,
Right,
}
pub struct Screen {
pub rows: u16,
pub cols: u16,
old_attr: termios,
cancel: SyncSender<()>,
keys: Receiver<Key>,
}
impl Screen {
pub fn init() -> Result<Screen, Box<dyn Error>> {
let mut size: winsize;
unsafe {
size = std::mem::zeroed();
if libc::ioctl(1, libc::TIOCGWINSZ, &mut size) < 0 {
return Err(Box::from("ioctl failed"));
}
}
if size.ws_col > 60 {
size.ws_col = 60;
}
if size.ws_row > 30 {
size.ws_row = 30;
}
let mut attr;
unsafe {
attr = std::mem::zeroed();
if libc::tcgetattr(1, &mut attr) < 0 {
return Err(Box::from("tcgetattr failed"));
}
}
unsafe {
let mut raw = std::mem::zeroed();
libc::cfmakeraw(&mut raw);
raw.c_cc[libc::VMIN] = 0;
raw.c_cc[libc::VTIME] = 1;
if libc::tcsetattr(1, libc::TCSANOW, &raw) < 0 {
return Err(Box::from("tcsetattr failed"));
}
}
clear()?;
move_cursor(0, 0)?;
for _ in 0..size.ws_col {
write!(stdout(), "-")?;
}
for i in 1..size.ws_row - 1 {
move_cursor(i, 0)?;
write!(stdout(), "|")?;
move_cursor(i, size.ws_col - 1)?;
write!(stdout(), "|")?;
}
move_cursor(size.ws_row - 1, 0)?;
for _ in 0..size.ws_col {
write!(stdout(), "-")?;
}
let (cancel_tx, cancel_rx) = std::sync::mpsc::sync_channel(0);
let (key_tx, key_rx) = std::sync::mpsc::sync_channel(4);
std::thread::spawn(move || {
let mut buf = [0; 3];
while let Err(TryRecvError::Empty) = cancel_rx.try_recv() {
let Ok(n) = stdin().read(&mut buf) else {
continue;
};
if n < 3 || buf[0] != 27 || buf[1] != b'[' {
continue;
}
let key = match buf[2] {
b'A' => Key::Up,
b'B' => Key::Down,
b'C' => Key::Right,
b'D' => Key::Left,
_ => {
continue;
}
};
let _ = key_tx.try_send(key);
}
});
Ok(Screen {
rows: size.ws_row,
cols: size.ws_col,
old_attr: attr,
cancel: cancel_tx,
keys: key_rx,
})
}
pub fn read_key(&self) -> Option<Key> {
if let Ok(key) = self.keys.try_recv() {
return Some(key);
}
None
}
pub fn in_bounds(&self, row: u16, col: u16) -> bool {
(1..self.rows - 1).contains(&row) && (1..self.cols - 1).contains(&col)
}
}
impl Drop for Screen {
fn drop(&mut self) {
self.cancel.send(()).unwrap();
unsafe {
libc::tcsetattr(1, libc::TCSANOW, &self.old_attr);
}
}
}
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