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|
use crate::error::*;
use futures_lite::io::AsyncWriteExt as _;
use crate::private::Output as _;
pub struct ScreenGuard {
cleaned_up: bool,
}
impl ScreenGuard {
pub async fn new() -> Result<Self> {
write_stdout(
&mut blocking::Unblock::new(std::io::stdout()),
crate::INIT,
)
.await?;
Ok(Self { cleaned_up: false })
}
pub async fn cleanup(&mut self) -> Result<()> {
if self.cleaned_up {
return Ok(());
}
self.cleaned_up = true;
write_stdout(
&mut blocking::Unblock::new(std::io::stdout()),
crate::DEINIT,
)
.await
}
}
impl Drop for ScreenGuard {
fn drop(&mut self) {
futures_lite::future::block_on(async {
let _ = self.cleanup().await;
});
}
}
pub struct Output {
stdout: blocking::Unblock<std::io::Stdout>,
cur: vt100::Parser,
next: vt100::Parser,
}
impl crate::private::Output 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 crate::Textmode for Output {}
impl Output {
pub async fn new() -> Result<(Self, ScreenGuard)> {
Ok((Self::new_without_screen(), ScreenGuard::new().await?))
}
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 {
stdout: blocking::Unblock::new(std::io::stdout()),
cur,
next,
}
}
pub async fn refresh(&mut self) -> Result<()> {
let diff = self.next().screen().state_diff(self.cur().screen());
write_stdout(&mut self.stdout, &diff).await?;
self.cur_mut().process(&diff);
Ok(())
}
}
async fn write_stdout(
stdout: &mut blocking::Unblock<std::io::Stdout>,
buf: &[u8],
) -> Result<()> {
stdout.write_all(buf).await.map_err(Error::WriteStdout)?;
stdout.flush().await.map_err(Error::WriteStdout)?;
Ok(())
}
|
