module main

import os

// a test where we execute a bash script but work around where we put script in bash inside bash

fn exec(path string, redirect bool) {
    mut line := ''
    mut line_err := ''
    mut cmd := os.new_process('/bin/bash')

    if redirect {
        cmd.set_args(['-c', '/bin/bash /tmp/test.sh 2>&1'])
    } else {
        cmd.set_args([path])
    }

    cmd.set_redirect_stdio()
    cmd.run()
    for cmd.is_alive() {
        line = cmd.stdout_read()
        println('STDOUT: ${line}')

        if !redirect {
            line_err = cmd.stderr_read()
            println('STDERR: ${line_err}')
        }
    }
    if cmd.code > 0 {
        println('ERROR:')
        println(cmd)
        // println(cmd.stderr_read())
    }
}

fn main() {
    script := '
echo line 1
#will use some stderr now
echo redirect 1 to 2  1>&2
echo line 3
'

    os.write_file('/tmp/test.sh', script) or { panic(err) }
    // os.chmod("/tmp/test.sh",0o700) //make executable

    // this will work because stderr/stdout are smaller than 4096 chars, once larger there can be deadlocks
    // in other words this can never work reliably without being able to check if there is data on stderr or stdout
    exec('/tmp/test.sh', false)

    // this will always work
    exec('/tmp/test.sh', true)
}