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use std::io::Write;
use std::os::fd::AsRawFd;
use std::process::{Child, ChildStdin, ChildStdout, Command, Stdio};
use anyhow::Result;
use crate::i3bar_protocol::{Block, Event, Protocol};
const INITIAL_BUF_CAPACITY: usize = 4096;
#[derive(Debug)]
pub struct StatusCmd {
pub child: Child,
pub output: ChildStdout,
input: ChildStdin,
protocol: Protocol,
buf: Vec<u8>,
buf_used: usize,
}
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();
nix::fcntl::fcntl(
output.as_raw_fd(),
nix::fcntl::F_SETFL(nix::fcntl::OFlag::O_NONBLOCK),
)?;
Ok(Self {
child,
output,
input,
protocol: Protocol::Unknown,
buf: vec![0; INITIAL_BUF_CAPACITY],
buf_used: 0,
})
}
pub fn read(&mut self) -> Result<Option<Vec<Block>>> {
assert!(self.buf.len() >= INITIAL_BUF_CAPACITY);
if self.buf.len() == self.buf_used {
// Double the capacity
self.buf.resize(self.buf_used * 2, 0);
}
match nix::unistd::read(self.output.as_raw_fd(), &mut self.buf[self.buf_used..]) {
Ok(0) => bail!("status command exited"),
Ok(n) => self.buf_used += n,
Err(nix::errno::Errno::EAGAIN) => return Ok(None),
Err(e) => bail!(e),
}
let rem = self
.protocol
.process_new_bytes(&self.buf[..self.buf_used])?;
if rem.is_empty() {
self.buf_used = 0;
} else {
let rem_len = rem.len();
self.buf
.copy_within((self.buf_used - rem_len)..self.buf_used, 0);
self.buf_used = rem_len;
}
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(())
}
}
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