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|
#![warn(clippy::cargo)]
#![warn(clippy::pedantic)]
#![warn(clippy::nursery)]
#![warn(clippy::as_conversions)]
#![warn(clippy::get_unwrap)]
#![allow(clippy::cognitive_complexity)]
#![allow(clippy::missing_const_for_fn)]
#![allow(clippy::similar_names)]
#![allow(clippy::struct_excessive_bools)]
#![allow(clippy::too_many_arguments)]
#![allow(clippy::too_many_lines)]
#![allow(clippy::type_complexity)]
use clap::Parser as _;
use tokio::io::{AsyncReadExt as _, AsyncWriteExt as _};
#[derive(Debug, clap::Parser)]
#[command(
name = "ttyrec",
about = "Records ttyrec files",
long_about = "\n\
This program will run a shell (or other program specified by the -c \
option), and record the full output, including timing information, \
for later playback (such as via the included `ttyplay` command)."
)]
struct Opt {
#[arg(
short,
long,
default_value = "ttyrec",
help = "File to save ttyrec data to"
)]
file: std::ffi::OsString,
#[arg(short, long, help = "Command to run [default: $SHELL]")]
cmd: Option<std::ffi::OsString>,
}
fn get_cmd(
cmd: Option<std::ffi::OsString>,
) -> (std::ffi::OsString, Vec<std::ffi::OsString>) {
cmd.map_or_else(
|| {
let shell =
std::env::var_os("SHELL").unwrap_or_else(|| "/bin/sh".into());
(shell, vec![])
},
|cmd| {
let mut exec_cmd = std::ffi::OsString::from("exec ");
exec_cmd.push(cmd);
("/bin/sh".into(), vec!["-c".into(), exec_cmd])
},
)
}
#[derive(Debug)]
enum Event {
Key(textmode::Result<Option<textmode::Key>>),
Stdout(std::io::Result<Vec<u8>>),
Resize((u16, u16)),
Error(anyhow::Error),
Quit,
}
#[tokio::main]
async fn async_main(opt: Opt) -> anyhow::Result<()> {
let Opt { cmd, file } = opt;
let (cmd, args) = get_cmd(cmd);
let fh = tokio::fs::File::create(file).await?;
let mut input = textmode::blocking::Input::new()?;
let _input_guard = input.take_raw_guard();
let mut stdout = tokio::io::stdout();
let size = terminal_size::terminal_size().map_or(
(24, 80),
|(terminal_size::Width(w), terminal_size::Height(h))| (h, w),
);
let mut pty = pty_process::Pty::new()?;
pty.resize(pty_process::Size::new(size.0, size.1))?;
let pts = pty.pts()?;
let mut child = pty_process::Command::new(cmd).args(args).spawn(&pts)?;
let (event_w, mut event_r) = tokio::sync::mpsc::unbounded_channel();
let (input_w, mut input_r) = tokio::sync::mpsc::unbounded_channel();
let (resize_w, mut resize_r) = tokio::sync::mpsc::unbounded_channel();
{
let mut signals = tokio::signal::unix::signal(
tokio::signal::unix::SignalKind::window_change(),
)?;
let event_w = event_w.clone();
tokio::task::spawn(async move {
while signals.recv().await.is_some() {
event_w
.send(Event::Resize(
terminal_size::terminal_size().map_or(
(24, 80),
|(
terminal_size::Width(w),
terminal_size::Height(h),
)| { (h, w) },
),
))
// event_w is never closed, so this can never fail
.unwrap();
}
});
}
{
let event_w = event_w.clone();
std::thread::spawn(move || {
loop {
event_w
.send(Event::Key(input.read_key()))
// event_w is never closed, so this can never fail
.unwrap();
}
});
}
{
let event_w = event_w.clone();
tokio::task::spawn(async move {
loop {
let mut buf = [0_u8; 4096];
tokio::select! {
res = pty.read(&mut buf) => {
let res = res.map(|n| buf[..n].to_vec());
let err = res.is_err();
event_w
.send(Event::Stdout(res))
// event_w is never closed, so this can never fail
.unwrap();
if err {
eprintln!("pty read failed: {}", err);
break;
}
}
res = input_r.recv() => {
// input_r is never closed, so this can never fail
let bytes: Vec<u8> = res.unwrap();
if let Err(e) = pty.write(&bytes).await {
event_w
.send(Event::Error(anyhow::anyhow!(e)))
// event_w is never closed, so this can never
// fail
.unwrap();
}
}
res = resize_r.recv() => {
// resize_r is never closed, so this can never fail
let size: (u16, u16) = res.unwrap();
if let Err(e) = pty.resize(
pty_process::Size::new(size.0, size.1),
) {
event_w
.send(Event::Error(anyhow::anyhow!(e)))
// event_w is never closed, so this can never
// fail
.unwrap();
}
}
_ = child.wait() => {
event_w.send(Event::Quit).unwrap();
break;
}
}
}
});
}
let mut writer = ttyrec::Writer::new(fh);
loop {
// XXX unwrap
match event_r.recv().await.unwrap() {
Event::Key(key) => {
let key = key?;
if let Some(key) = key {
input_w.send(key.into_bytes()).unwrap();
} else {
break;
}
}
Event::Stdout(bytes) => match bytes {
Ok(bytes) => {
writer.frame(&bytes).await?;
stdout.write_all(&bytes).await?;
stdout.flush().await?;
}
Err(e) => {
anyhow::bail!("failed to read from child process: {}", e);
}
},
Event::Resize((h, w)) => {
resize_w.send((h, w)).unwrap();
}
Event::Error(e) => {
return Err(e);
}
Event::Quit => break,
}
}
Ok(())
}
fn main() {
let opt = Opt::parse();
match async_main(opt) {
Ok(_) => (),
Err(e) => {
eprintln!("ttyrec: {}", e);
std::process::exit(1);
}
};
}
|
