platform.js

'use strict';

const os = require('os');

const folders = {
  'osx': 'osx',
  'darwin': 'osx',
  'linux': 'linux',
  'sunos': 'sunos',
  'windows': 'windows',
  'win32': 'windows'
};

// Check if the platform is there in the list of platforms or not
function isSupported(platform) {
  return Object.prototype.hasOwnProperty.call(folders, platform);
}

// If the platform given in config is present, return that.
// Else, return the system platform
function getPreferredPlatform(config) {
  let platform = config.platform;
  if (isSupported(platform)) {
    return platform;
  }
  return os.platform();
}

// Get the folder name for a platform
function getPreferredPlatformFolder(config) {
  let platform = getPreferredPlatform(config);
  return folders[platform];
}

module.exports = {
  isSupported,
  getPreferredPlatform,
  getPreferredPlatformFolder
};