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