ryuu-beta/util/design.js

var Manifest = require('../util/manifest');
var log = require('../util/log');
var validator = require('validator');

module.exports = {
  /**
   * Takes up to two args to check for a valid design id and gives priority to
   * the first argument
   * @param  {String} arg1 designId arg that will take priority if both args
   * are defined and valid
   * @param  {String} arg2 designId arg that will be the fallback if the first
   * arg is null or undefined
   * @param  {Object} man object defining the program manifest of the current
   * context
   * @return {String}      Returns id with this priority: arg1, arg2,
   * manifest.id, null
   */
  getDesignId: function(arg1, arg2, man) {
    var id = arg1 || arg2;

    if (id) {
      if (!validator.isUUID(id)) return log.fail('The value specified for option -i is not a valid design ID', id);
    } else {
      var manifest = Manifest.get(man);
      if (!manifest || !manifest.id) return log.fail('No manifest found. Please supply design id using -i or change to a directory with a valid manifest file');
      id = manifest.id;
    }
    return id;
  }
}