Midi generator with scribbletune

const scribble = require('scribbletune')
const _ = require('lodash')

function randomInt (min, max) {
  return Math.floor((Math.random() * max) + min)
}

function createPattern () {
  let choices = ['x', '_']
  let pattern = ''

  for (let i = 1; i < 64; i++) {
    pattern += choices[Math.floor(Math.random()*choices.length)]
  }

  return pattern
}

function generateName (length) {
  let chars = [], token = ''
  let abc = ['a', 'b', 'c', 'd', 'e', 'f',
            'g', 'h', 'i', 'j', 'k', 'l',
            'm', 'n', 'o', 'p', 'q', 'r',
            's', 't', 'u', 'v', 'w', 'x',
            'y', 'z']
  let abcUp = abc.map(function(x){ return x.toUpperCase() })
  let nums = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']

  chars = chars.concat(abc, abcUp, nums)

  for (let i = 1; i < length; i++) {
    token += chars[randomInt(0, chars.length)]
  }

  return token
}

const notes = ['g', 'b', 'b', 'c', 'd', 'e', 'f']
const scales = scribble.scales

const randomNote = _.shuffle(notes)[0]
const randomScale = _.shuffle(scales)[0]


for (let i = 1; i < 100; i++) {
  let shuffle
  if (randomInt(-1, 2) === 1) {
    shuffle = true
  } else {
    shuffle = false
  }

  let midi = scribble.clip({
    notes: scribble.scale(randomNote, randomScale, randomInt(0, 8)), // this works too ['c3', 'd3', 'e3', 'f3', 'g3', 'a3', 'b3']
    pattern: createPattern(),
    shuffle: true
  })

  let name = generateName(16)

  scribble.midi(midi, `./random-songs/${name}.mid`)

  console.log(`Created midi with the name: ${name}`)
}