index.js

#! /usr/bin/env node

var http = require('http');
var fs = require('fs');
var random = require('random-string');
var Image = require('./image/Image')

/* Require Commander configuration */
var program = require('./commanderConfig');

var createdFilesCount = 0;
var createdFiles = [];

var download = function (url, dest) {
  'use strict';

  var file = fs.createWriteStream(dest);
  var request = http.get(url, function (response) {
    response.pipe(file);
    file.on('finish', function () {
      file.close(function () {
        'use strict';

        createdFilesCount++;
        createdFiles.push(dest);

        var percentage = Math.ceil((createdFilesCount/program.number*100));

        console.info('Downloaded ' + createdFilesCount + ' of ' + program.number + '. [' + percentage + ' %]');

        if (createdFilesCount === program.number) {
          console.info("\n" + program.number + ' image(s) successfully downloaded:');
          console.log(createdFiles);
        }
      });
    });
    file.on('error', function () {
      console.log('Failed');
    })
  });
};

var filename = function (iterator) {
  'use strict';

  return 'spaceholder_' + program.size + '_' + random({ length: 4 }) + iterator + random({ length: 4 }) + '.jpg'
}

for (i = 1; i <= program.number; i++) {
  download(Image.getImageUrl(program.size), filename(i));
}