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|
#![warn(clippy::cargo)]
#![warn(clippy::pedantic)]
#![warn(clippy::nursery)]
#![warn(clippy::unwrap_used)]
#![warn(clippy::expect_used)]
#![warn(clippy::indexing_slicing)]
#![warn(clippy::as_conversions)]
#![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)]
use async_std::io::{ReadExt as _, WriteExt as _};
use async_std::prelude::FutureExt as _;
use async_std::stream::StreamExt as _;
use pty_process::Command as _;
#[derive(Debug, structopt::StructOpt)]
#[structopt(
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 {
#[structopt(
short,
long,
default_value = "ttyrec",
help = "File to save ttyrec data to"
)]
file: std::ffi::OsString,
#[structopt(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])
},
)
}
enum Event {
Key(textmode::Result<Option<textmode::Key>>),
Stdout(std::io::Result<Vec<u8>>),
Resize((u16, u16)),
Error(anyhow::Error),
}
async fn resize(event_w: &async_std::channel::Sender<Event>) {
let size = terminal_size::terminal_size().map_or(
(24, 80),
|(terminal_size::Width(w), terminal_size::Height(h))| (h, w),
);
event_w
.send(Event::Resize(size))
.await
// event_w is never closed, so this can never fail
.unwrap_or_else(|_| unreachable!());
}
async fn async_main(opt: Opt) -> anyhow::Result<()> {
let Opt { cmd, file } = opt;
let (cmd, args) = get_cmd(cmd);
let size = terminal_size::terminal_size().map_or(
(24, 80),
|(terminal_size::Width(w), terminal_size::Height(h))| (h, w),
);
let fh = async_std::fs::File::create(file).await?;
let mut input = textmode::Input::new().await?;
let _input_guard = input.take_raw_guard();
let mut stdout = async_std::io::stdout();
let child = async_std::process::Command::new(cmd)
.args(args)
.spawn_pty(Some(&pty_process::Size::new(size.0, size.1)))?;
let (event_w, event_r) = async_std::channel::unbounded();
let (input_w, input_r) = async_std::channel::unbounded();
let (resize_w, resize_r) = async_std::channel::unbounded();
{
let mut signals = signal_hook_async_std::Signals::new(&[
signal_hook::consts::signal::SIGWINCH,
])?;
let event_w = event_w.clone();
async_std::task::spawn(async move {
while signals.next().await.is_some() {
resize(&event_w).await;
}
});
}
{
let event_w = event_w.clone();
async_std::task::spawn(async move {
loop {
event_w
.send(Event::Key(input.read_key().await))
.await
// event_w is never closed, so this can never fail
.unwrap_or_else(|_| unreachable!());
}
});
}
{
let event_w = event_w.clone();
async_std::task::spawn(async move {
loop {
enum Res {
Read(Result<usize, std::io::Error>),
Write(Result<Vec<u8>, async_std::channel::RecvError>),
Resize(Result<(u16, u16), async_std::channel::RecvError>),
}
let mut buf = [0_u8; 4096];
let mut pty = child.pty();
let read = async { Res::Read(pty.read(&mut buf).await) };
let write = async { Res::Write(input_r.recv().await) };
let resize = async { Res::Resize(resize_r.recv().await) };
match read.race(write).race(resize).await {
Res::Read(res) => {
let res = res.map(|n| buf.get(..n).unwrap().to_vec());
let err = res.is_err();
event_w
.send(Event::Stdout(res))
.await
// event_w is never closed, so this can never fail
.unwrap_or_else(|_| unreachable!());
if err {
break;
}
}
Res::Write(res) => {
// input_r is never closed, so this can never fail
let bytes = res.unwrap_or_else(|_| unreachable!());
if let Err(e) = pty.write(&bytes).await {
event_w
.send(Event::Error(anyhow::anyhow!(e)))
.await
// event_w is never closed, so this can never
// fail
.unwrap_or_else(|_| unreachable!());
}
}
Res::Resize(res) => {
// resize_r is never closed, so this can never fail
let size = res.unwrap_or_else(|_| unreachable!());
if let Err(e) = child.resize_pty(
&pty_process::Size::new(size.0, size.1),
) {
event_w
.send(Event::Error(anyhow::anyhow!(e)))
.await
// event_w is never closed, so this can never
// fail
.unwrap_or_else(|_| unreachable!());
}
}
}
}
});
}
resize(&event_w).await;
let mut writer = ttyrec::Writer::new(fh);
loop {
match event_r.recv().await? {
Event::Key(key) => {
let key = key?;
if let Some(key) = key {
input_w.send(key.into_bytes()).await?;
} else {
break;
}
}
Event::Stdout(bytes) => match bytes {
Ok(bytes) => {
writer.frame(&bytes).await?;
stdout.write_all(&bytes).await?;
stdout.flush().await?;
}
Err(e) => {
if e.raw_os_error() == Some(libc::EIO) {
break;
}
anyhow::bail!("failed to read from child process: {}", e);
}
},
Event::Resize((h, w)) => {
resize_w.send((h, w)).await?;
}
Event::Error(e) => {
return Err(e);
}
}
}
Ok(())
}
#[paw::main]
fn main(opt: Opt) {
match async_std::task::block_on(async_main(opt)) {
Ok(_) => (),
Err(e) => {
eprintln!("ttyrec: {}", e);
std::process::exit(1);
}
};
}
|
