index.js

#!/usr/bin/env node
/* global document:true, window:true */

var eol = require('eol')
var fs = require('fs')
var jsdom = require('jsdom').jsdom
document = jsdom()
window = document.defaultView
var clipboardy = require('clipboardy')
var git = require('git-rev')
var prompt = require('cli-input')

var Generator = require('./lib/generator')
var pkg = require('./package.json')

var help = 'Usage:\n' +
    '\n' +
    '    spotgen input.txt [output.txt]\n' +
    '\n' +
    'input.txt is a text file containing a generator string,\n' +
    'invoking any number of generator commands. output.txt\n' +
    'will contain the generator\'s output, a list of Spotify URIs\n' +
    'which can be imported into Spotify. If an output file is not\n' +
    'specified, then the Spotify URIs are written to standard output,\n' +
    'with an option to copy them to the clipboard.\n' +
    '\n' +
    'Alternatively, you can pass a generator string as a single argument:\n' +
    '\n' +
    '    spotgen "#artist Bowery Electric"\n' +
    '    spotgen "#similar Beach House\\n#similar Hooverphonic"\n' +
    '    spotgen http://www.last.fm/user/username/library\n' +
    '\n' +
    'Make sure to surround the string with quotes (") if it contains\n' +
    'spaces or special characters. Line breaks can be expressed as \\n.\n' +
    '\n' +
    'You can also run the generator with no arguments and enter commands\n' +
    'interactively. This saves you the trouble of quoting strings and\n' +
    'escaping newlines.\n' +
    '\n' +
    'To import the playlist into Spotify:\n' +
    '\n' +
    '1.  Copy the output of the generator:\n' +
    '    Choose Edit -> Copy (Ctrl + C).\n' +
    '2.  Create a new playlist in Spotify:\n' +
    '    Choose File -> New Playlist (Ctrl + N).\n' +
    '3.  Paste into the playlist:\n' +
    '    Select the playlist and choose Edit -> Paste (Ctrl + V).'

/**
 * Generator function.
 * @param {string} str - Generator string.
 * @param {output} [output] - Output file.
 * @return {Promise} A promise.
 */
function generate (str, output) {
  output = output || 'STDOUT'
  output = output.trim()
  var generator = new Generator(str)
  return generator.generate().then(function (result) {
    if (!result) {
      return
    }
    if (output === 'STDOUT') {
      console.log('')
      if (generator.format === 'uri') {
        console.log(
          '********************************************************\n' +
            '* COPY AND PASTE THE BELOW INTO A NEW SPOTIFY PLAYLIST *\n' +
            '********************************************************\n')
      }
      console.log(result + '\n')
      var ps = prompt({format: 'Copy to clipboard? (Y/n) '})
      ps.prompt(null, function (err, val) {
        if (err) {
          return
        }
        if (val[0].toLowerCase().trim() !== 'n') {
          clipboardy.writeSync(result + '\n')
        }
        ps.close()
      })
    } else {
      result = eol.auto(result)
      fs.writeFile(output, result, function (err) {
        if (err) { return }
        console.log('Wrote to ' + output)
      })
    }
  })
}

/**
 * Main method.
 * Invoked when run from the command line.
 */
function main () {
  var input = process.argv[2]
  var output = process.argv[3]
  var str = input
  if (typeof input === 'string' &&
      input.match(/(^-*h(elp)?$)|(^\/\?$)/gi)) {
    console.log(help)
    return
  } else if (typeof input === 'string' &&
             input.match(/(^-*v(ersion)?$)|(^\/\?$)/gi)) {
    process.chdir(__dirname)
    git.short(function (sha) {
      console.log(pkg.version + (sha ? ('+' + sha) : ''))
    })
    return
  }
  if (!input) {
    console.log('Enter generator string (submit with Ctrl-D):')
    var ps = prompt()
    ps.multiline(function (err, lines, str) {
      ps.close()
      if (err) {
        return
      }
      if (str !== '' && str.slice(-1) !== '\n') {
        console.log('')
      }
      generate(str)
    })
  } else {
    try {
      // is input a file name?
      str = fs.readFileSync(input, 'utf8').toString()
      str = eol.lf(str)
      generate(str, output)
    } catch (err) {
      // input is generator string; help out primitive shells
      // (e.g., Windows') with newlines
      str = str.replace(/\\n/gi, '\n')
      generate(str, output)
    }
  }
}

if (require.main === module) {
  main()
}

module.exports = Generator