text: 'use strict';
  var _ = require('lodash');
  var rx = require('rx-lite');
  var runAsync = require('run-async');
  
  
  /**
   * Create an oversable returning the result of a function runned in sync or async mode.
   * @param  {Function} func Function to run
   * @return {rx.Observable} Observable emitting when value is known
   */
  
  exports.createObservableFromAsync = function (func) {
    return rx.Observable.defer(function () {
      return rx.Observable.create(function (obs) {
        runAsync(func, function (value) {
          obs.onNext(value);
          obs.onCompleted();
        });
      });
    });
  };
  
  
  /**
   * Resolve a question property value if it is passed as a function.
   * This method will overwrite the property on the question object with the received value.
   * @param  {Object} question - Question object
   * @param  {String} prop     - Property to fetch name
   * @param  {Object} answers  - Answers object
   * @...rest {Mixed} rest     - Arguments to pass to `func`
   * @return {rx.Obsersable}   - Observable emitting once value is known
   */
  
  exports.fetchAsyncQuestionProperty = function (question, prop, answers) {
    if (!_.isFunction(question[prop])) {
      return rx.Observable.return(question);
    }
  
    return exports.createObservableFromAsync(function () {
      var done = this.async();
      runAsync(question[prop], function (value) {
        question[prop] = value;
        done(question);
      }, answers);
    });
  };
  