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use std::io::Write;
use std::process::{Child, ChildStdin, Command, Stdio};
use anyhow::Result;
use tokio::io::AsyncReadExt;
use tokio::process::ChildStdout;
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>,
}
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: ChildStdout::from_std(output)?,
input,
protocol: Protocol::Unknown,
buf: Vec::with_capacity(INITIAL_BUF_CAPACITY),
})
}
pub fn notify_available(&mut self) -> Result<Option<Vec<Block>>> {
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);
}
Ok(self.protocol.get_blocks())
}
pub async fn read(&mut self) -> Result<()> {
assert!(self.buf.capacity() >= INITIAL_BUF_CAPACITY);
if self.buf.capacity() == self.buf.len() {
// Double the capacity
self.buf.reserve(self.buf.len());
}
let read_len = self.output.read_buf(&mut self.buf).await?;
if read_len == 0 {
bail!("status command exited");
}
Ok(())
}
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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