packager/pkgr/src/process/output.rs

// create functions that spawn threads for Stdout and Stderr
// that print the output to info!(target: "command:stdout", ...) and info!(target: "command:stderr", ...) respectively

use std::io::{BufRead, BufReader};
use std::process::Child;

use log::{error, info};

pub fn spawn_output_handlers(child: &mut Child) {
    let stdout = child.stdout.take().unwrap();
    let stderr = child.stderr.take().unwrap();

    std::thread::spawn(move || {
        let reader = BufReader::new(stdout);
        for line in reader.lines() {
            info!(target: "command:stdout", "{}", line.unwrap());
        }
    });

    std::thread::spawn(move || {
        let reader = BufReader::new(stderr);
        for line in reader.lines() {
            error!(target: "command:stderr", "{}", line.unwrap());
        }
    });
}