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|
/// Create and manage pseudoterminals
use std::{
io::{self, BufWriter, Read, Write},
sync::{Arc, RwLock},
time::Duration,
};
use bytes::Bytes;
use crossterm::{
event::{self, Event, KeyCode, KeyEventKind},
execute,
style::ResetColor,
terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
};
use portable_pty::{CommandBuilder, NativePtySystem, PtySize, PtySystem};
use ratatui::{
backend::{Backend, CrosstermBackend},
layout::Alignment,
style::{Modifier, Style},
widgets::{Block, Borders, Paragraph},
Frame, Terminal,
};
use tokio::{
sync::mpsc::{channel, Sender},
task,
};
use tui_term::widget::PseudoTerminal;
use vt100::Screen;
#[derive(Debug)]
struct Size {
cols: u16,
rows: u16,
}
pub async fn run_pty(blocks: Vec<crate::markdown::Block>) -> io::Result<()> {
let mut stdout = io::stdout();
execute!(stdout, ResetColor)?;
enable_raw_mode()?;
let mut stdout = io::stdout();
execute!(stdout, EnterAlternateScreen)?;
let backend = CrosstermBackend::new(stdout);
let mut terminal = Terminal::new(backend)?;
let pty_system = NativePtySystem::default();
let cwd = std::env::current_dir().unwrap();
let mut cmd = CommandBuilder::new_default_prog();
cmd.cwd(cwd);
let size = Size {
rows: terminal.size()?.height,
cols: terminal.size()?.width,
};
let pair = pty_system
.openpty(PtySize {
rows: size.rows,
cols: size.cols,
pixel_width: 0,
pixel_height: 0,
})
.unwrap();
// Wait for the child to complete
task::spawn_blocking(move || {
let mut child = pair.slave.spawn_command(cmd).unwrap();
let _child_exit_status = child.wait().unwrap();
drop(pair.slave);
});
let mut reader = pair.master.try_clone_reader().unwrap();
let parser = Arc::new(RwLock::new(vt100::Parser::new(size.rows, size.cols, 0)));
{
let parser = parser.clone();
task::spawn_blocking(move || {
// Consume the output from the child
// Can't read the full buffer, since that would wait for EOF
let mut buf = [0u8; 8192];
let mut processed_buf = Vec::new();
loop {
let size = reader.read(&mut buf).unwrap();
if size == 0 {
break;
}
if size > 0 {
processed_buf.extend_from_slice(&buf[..size]);
let mut parser = parser.write().unwrap();
parser.process(&processed_buf);
// Clear the processed portion of the buffer
processed_buf.clear();
}
}
});
}
let (tx, mut rx) = channel::<Bytes>(32);
let mut writer = BufWriter::new(pair.master.take_writer().unwrap());
// Drop writer on purpose
tokio::spawn(async move {
while let Some(bytes) = rx.recv().await {
writer.write_all(&bytes).unwrap();
writer.flush().unwrap();
}
drop(pair.master);
});
println!("{blocks:?}");
run(&mut terminal, parser, tx, blocks).await?;
tokio::time::sleep(Duration::from_secs(2)).await;
// restore terminal
disable_raw_mode()?;
execute!(terminal.backend_mut(), LeaveAlternateScreen,)?;
terminal.show_cursor()?;
Ok(())
}
async fn run<B: Backend>(
terminal: &mut Terminal<B>,
parser: Arc<RwLock<vt100::Parser>>,
sender: Sender<Bytes>,
blocks: Vec<crate::markdown::Block>,
) -> io::Result<()> {
tokio::time::sleep(Duration::from_millis(500)).await;
for i in blocks {
terminal.draw(|f| ui(f, parser.read().unwrap().screen()))?;
tokio::time::sleep(Duration::from_millis(500)).await;
for line in i.code.lines() {
let b = Bytes::from(line.trim_end().to_string().into_bytes());
sender.send(b).await;
sender.send(Bytes::from(vec![b'\n'])).await;
terminal.draw(|f| ui(f, parser.read().unwrap().screen()))?;
tokio::time::sleep(Duration::from_millis(500)).await;
}
}
terminal.draw(|f| ui(f, parser.read().unwrap().screen()))?;
tokio::time::sleep(Duration::from_millis(1500)).await;
Ok(())
}
fn ui(f: &mut Frame, screen: &Screen) {
let chunks = ratatui::layout::Layout::default()
.direction(ratatui::layout::Direction::Vertical)
.margin(1)
.constraints(
[
ratatui::layout::Constraint::Percentage(100),
ratatui::layout::Constraint::Min(1),
]
.as_ref(),
)
.split(f.size());
let block = Block::default()
.borders(Borders::ALL)
.style(Style::default().add_modifier(Modifier::BOLD));
let pseudo_term = PseudoTerminal::new(screen).block(block);
f.render_widget(pseudo_term, chunks[0]);
let explanation = "Press q to exit".to_string();
let explanation = Paragraph::new(explanation)
.style(Style::default().add_modifier(Modifier::BOLD | Modifier::REVERSED))
.alignment(Alignment::Center);
f.render_widget(explanation, chunks[1]);
}
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