reader.rs

use std::io::Read;
use std::process;

fn main() {
    let cmdline_args: Vec<String> = std::env::args().collect();
    let mut path = std::path::Path::new(&cmdline_args[1]).to_path_buf();
    let args = &cmdline_args[2..];
    let mut proc = process::Command::new(&path)
        .args(args)
        .stdout(process::Stdio::piped())
        .spawn()
        .unwrap();
    let mut stdout = proc.stdout.take().expect("Failed to take stdout.");
    let mut s = [0u8; 5];
    loop {
        dbg!(stdout.read(&mut s));
        let vec: Vec<u8> = Vec::from(&s as &[u8]);
        println!("Got: {}", String::from_utf8(vec).unwrap());
    }
}