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use futures_lite::io::AsyncWriteExt as _;
use super::private::TextmodeImpl as _;
pub struct ScreenGuard {
cleaned_up: bool,
}
impl ScreenGuard {
pub async fn cleanup(&mut self) -> std::io::Result<()> {
if self.cleaned_up {
return Ok(());
}
self.cleaned_up = true;
write_stdout(super::DEINIT).await
}
}
impl Drop for ScreenGuard {
fn drop(&mut self) {
futures_lite::future::block_on(async {
let _ = self.cleanup().await;
});
}
}
pub struct Output {
cur: vt100::Parser,
next: vt100::Parser,
}
impl super::private::TextmodeImpl for Output {
fn cur(&self) -> &vt100::Parser {
&self.cur
}
fn cur_mut(&mut self) -> &mut vt100::Parser {
&mut self.cur
}
fn next(&self) -> &vt100::Parser {
&self.next
}
fn next_mut(&mut self) -> &mut vt100::Parser {
&mut self.next
}
}
impl super::Textmode for Output {}
impl Output {
pub async fn new() -> std::io::Result<(Self, ScreenGuard)> {
write_stdout(super::INIT).await?;
Ok((
Self::new_without_screen(),
ScreenGuard { cleaned_up: false },
))
}
pub fn new_without_screen() -> Self {
let (rows, cols) = match terminal_size::terminal_size() {
Some((terminal_size::Width(w), terminal_size::Height(h))) => {
(h, w)
}
_ => (24, 80),
};
let cur = vt100::Parser::new(rows, cols, 0);
let next = vt100::Parser::new(rows, cols, 0);
Self { cur, next }
}
pub async fn refresh(&mut self) -> std::io::Result<()> {
let diffs = &[
self.next().screen().contents_diff(self.cur().screen()),
self.next().screen().input_mode_diff(self.cur().screen()),
self.next().screen().title_diff(self.cur().screen()),
self.next().screen().bells_diff(self.cur().screen()),
];
for diff in diffs {
write_stdout(&diff).await?;
self.cur_mut().process(&diff);
}
Ok(())
}
}
async fn write_stdout(buf: &[u8]) -> std::io::Result<()> {
let mut stdout = blocking::Unblock::new(std::io::stdout());
stdout.write_all(buf).await?;
stdout.flush().await?;
Ok(())
}
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