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use std::io::{BufRead, BufReader, Write};
use std::os::unix::prelude::AsRawFd;
use std::process::{Child, ChildStdin, ChildStdout, Command, Stdio};
use anyhow::Result;
use tokio::io::unix::AsyncFd;
use tokio::io::Interest;
use crate::i3bar_protocol::{Block, Event, Protocol};
#[derive(Debug)]
pub struct StatusCmd {
pub child: Child,
output: BufReader<ChildStdout>,
input: ChildStdin,
protocol: Protocol,
buf: Vec<u8>,
pub async_fd: AsyncFd<i32>,
}
impl StatusCmd {
pub fn new(cmd: &str) -> Result<Self> {
let mut child = Command::new("sh")
.args(["-c", &format!("exec {cmd}")])
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.spawn()?;
let output = child.stdout.take().unwrap();
let input = child.stdin.take().unwrap();
let async_fd = AsyncFd::with_interest(output.as_raw_fd(), Interest::READABLE)?;
Ok(Self {
child,
output: BufReader::new(output),
input,
protocol: Protocol::Unknown,
buf: Vec::new(),
async_fd,
})
}
pub fn notify_available(&mut self) -> Result<Option<Vec<Block>>> {
let buf = self.output.fill_buf()?;
if buf.is_empty() {
bail!("status command exited");
}
if self.buf.is_empty() {
let rem = self.protocol.process_new_bytes(buf)?;
if !rem.is_empty() {
self.buf.extend_from_slice(rem);
}
} else {
self.buf.extend_from_slice(buf);
let rem = self.protocol.process_new_bytes(&self.buf)?;
if rem.is_empty() {
self.buf.clear();
} else {
let used = self.buf.len() - rem.len();
self.buf.drain(..used);
}
}
let consumed = buf.len();
self.output.consume(consumed);
Ok(self.protocol.get_blocks())
}
pub fn send_click_event(&mut self, event: &Event) -> Result<()> {
if self.protocol.supports_clicks() {
writeln!(self.input, "{}", serde_json::to_string(event).unwrap())?;
}
Ok(())
}
// pub fn quick_insert(&self, handle: LoopHandle<BarState>) {
// handle
// .insert_source(
// calloop::generic::Generic::new(
// self.output.get_ref().as_raw_fd(),
// calloop::Interest {
// readable: true,
// writable: false,
// },
// calloop::Mode::Level,
// ),
// move |ready, _, bar_state| {
// if ready.readable {
// bar_state.notify_available()?;
// Ok(calloop::PostAction::Continue)
// } else {
// bar_state.set_error("error reading from status command");
// if let Some(mut child) = bar_state.status_cmd.take() {
// let _ = child.child.kill();
// }
// Ok(calloop::PostAction::Remove)
// }
// },
// )
// .expect("failed to inser calloop source");
// }
}
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