I want to get the real time output of a command line-by-line and pass the line to another function for further processing. I have the following code for reading the output:
fn output(x: &str) -> Result<(), Error> {
let stdout = Command::new("strace")
.args(&["-p", x])
.stdout(Stdio::piped())
.spawn()?
.stdout
.ok_or_else(|| Error::new(ErrorKind::Other,"Could not capture standard output."))?;
let reader = BufReader::new(stdout);
reader
.lines()
.filter_map(|line| line.ok())
.for_each(|line| println!("hello {}", line));
Ok(())
}
I tried changing the .for_each to pass it into the function, but it didn't work. It still printed out the normal output and after adding a println!(); for debugging, I've found that the lines don't even get to the function. I'm stuck. Please help!
