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use std::io::{BufRead, BufReader, Result, Write};
use std::os::unix::prelude::AsRawFd;
use std::process::{Child, ChildStdin, ChildStdout, Command, Stdio};
use smithay_client_toolkit::reexports::calloop::{self, LoopHandle};
use crate::i3bar_protocol::{Block, Event, Protocol};
use crate::BarState;
pub struct StatusCmd {
child: Child,
output: BufReader<ChildStdout>,
input: ChildStdin,
protocol: Protocol,
buf: Vec<u8>,
}
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();
Ok(Self {
child,
output: BufReader::new(output),
input,
protocol: Protocol::Unknown,
buf: Vec::new(),
})
}
pub fn notify_available(&mut self) -> Result<Option<Vec<Block>>> {
let buf = self.output.fill_buf()?;
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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