promise_cmd.js

// Never rewrite this stupid block again
// const result = await promise_cmd("hostname")
// result = [int code, Buffer stdout, Buffer stderr]

const {spawn} = require('child_process')

const promise_cmd = (cmd) => {
  const job = spawn(cmd)
  let stdout = Buffer.from([])
  let stderr = Buffer.from([])
  return new Promise((resolve, reject) => {
    job.stdout.on('data', (data) => {
      stdout = Buffer.concat([stdout, data])
    })
    job.stderr.on('data', (data) => {
      stderr = Buffer.concat([stderr, data])
    })
    job.on('close', (code) => {
      resolve([code, stdout, stderr])
    })
  })
}