'use strict'

const fs = require('fs')

// util function modified from github.com/bucaran/sget
module.exports.readLineSync = function(message) {
  message = message || ''
  const win32 = () => 'win32' === process.platform
  const readSync = function(buffer) {
    var fd = win32() ? process.stdin.fd : fs.openSync('/dev/stdin', 'rs')
    var bytes = fs.readSync(fd, buffer, 0, buffer.length)
    if (!win32()) fs.closeSync(fd)
    return bytes
  }
  return (function(buffer) {
    try {
      process.stdout.write(message + ' ')
      return buffer.toString(null, 0, readSync(buffer))
    } catch (e) {
      throw e
    }
  }(new Buffer(256)))
}

module.exports.range = n => Array(n + 1).join(1).split('').map((x, i) => i)

module.exports.inverse2D = Arr => Arr[0].map((val, j) => Arr.map(column => column[j]))