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node_modules/inquirer/lib/prompts/editor.js 2.43 KB
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  /**
   * `editor` type prompt
   */
  
  var util = require('util');
  var chalk = require('chalk');
  var ExternalEditor = require('external-editor');
  var Base = require('./base');
  var observe = require('../utils/events');
  var rx = require('rx-lite-aggregates');
  
  /**
   * Module exports
   */
  
  module.exports = Prompt;
  
  /**
   * Constructor
   */
  
  function Prompt() {
    return Base.apply(this, arguments);
  }
  util.inherits(Prompt, Base);
  
  /**
   * Start the Inquiry session
   * @param  {Function} cb      Callback when prompt is done
   * @return {this}
   */
  
  Prompt.prototype._run = function (cb) {
    this.done = cb;
  
    this.editorResult = new rx.Subject();
  
    // Open Editor on "line" (Enter Key)
    var events = observe(this.rl);
    this.lineSubscription = events.line.forEach(this.startExternalEditor.bind(this));
  
    // Trigger Validation when editor closes
    var validation = this.handleSubmitEvents(this.editorResult);
    validation.success.forEach(this.onEnd.bind(this));
    validation.error.forEach(this.onError.bind(this));
  
    // Prevents default from being printed on screen (can look weird with multiple lines)
    this.currentText = this.opt.default;
    this.opt.default = null;
  
    // Init
    this.render();
  
    return this;
  };
  
  /**
   * Render the prompt to screen
   * @return {Prompt} self
   */
  
  Prompt.prototype.render = function (error) {
    var bottomContent = '';
    var message = this.getQuestion();
  
    if (this.status === 'answered') {
      message += chalk.dim('Received');
    } else {
      message += chalk.dim('Press <enter> to launch your preferred editor.');
    }
  
    if (error) {
      bottomContent = chalk.red('>> ') + error;
    }
  
    this.screen.render(message, bottomContent);
  };
  
  /**
   * Launch $EDITOR on user press enter
   */
  
  Prompt.prototype.startExternalEditor = function () {
    // Pause Readline to prevent stdin and stdout from being modified while the editor is showing
    this.rl.pause();
    ExternalEditor.editAsync(this.currentText, this.endExternalEditor.bind(this));
  };
  
  Prompt.prototype.endExternalEditor = function (error, result) {
    this.rl.resume();
    if (error) {
      this.editorResult.onError(error);
    } else {
      this.editorResult.onNext(result);
    }
  };
  
  Prompt.prototype.onEnd = function (state) {
    this.editorResult.dispose();
    this.lineSubscription.dispose();
    this.answer = state.value;
    this.status = 'answered';
    // Re-render prompt
    this.render();
    this.screen.done();
    this.done(this.answer);
  };
  
  Prompt.prototype.onError = function (state) {
    this.render(state.isValid);
  };