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use futures_lite::io::AsyncWriteExt as _;
use super::private::TextmodeImpl as _;
pub struct Textmode {
cur: vt100::Parser,
next: vt100::Parser,
}
impl super::private::TextmodeImpl for Textmode {
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::TextmodeExt for Textmode {}
impl Textmode {
pub async fn new() -> std::io::Result<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);
let self_ = Self { cur, next };
self_
.write_stdout(b"\x1b7\x1b[?47h\x1b[2J\x1b[H\x1b[?25h")
.await?;
Ok(self_)
}
// TODO: without async drop or async closures, i'm not sure how to do
// better than this
pub async fn cleanup(&mut self) -> std::io::Result<()> {
self.write_stdout(b"\x1b[?47l\x1b8\x1b[?25h").await
}
pub async fn refresh(&mut self) -> std::io::Result<()> {
let diff = self.next().screen().contents_diff(self.cur().screen());
self.write_stdout(&diff).await?;
self.cur_mut().process(&diff);
Ok(())
}
async fn write_stdout(&self, 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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