'use strict'; /** * `input` type prompt */ var util = require('util'); var observe = require('../utils/events'); var utils = require('../utils/'); var Base = require('./base'); /** * 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; // Once user confirm (enter key) var events = observe(this.rl); var submit = events.line.map(this.filterInput.bind(this)); var validation = this.handleSubmitEvents(submit); validation.success.forEach(this.onEnd.bind(this)); validation.error.forEach(this.onError.bind(this)); events.keypress.takeUntil(validation.success).forEach(this.onKeypress.bind(this)); // Init this.render(); return this; }; /** * Render the prompt to screen * @return {Prompt} self */ Prompt.prototype.render = function(error) { var cursor = 0; var message = this.getQuestion(); if (this.status === 'answered') { message += utils.chalk.cyan(this.answer); } else { message += this.rl.line; } if (error) { message += '\n' + utils.chalk.red('>> ') + error; cursor++; } this.screen.render(message, { cursor: cursor }); }; /** * When user press `enter` key */ Prompt.prototype.filterInput = function(input) { if (!input) { return this.opt.default != null ? this.opt.default : ''; } return input; }; Prompt.prototype.onEnd = function(state) { this.filter(state.value, function(filteredValue) { this.answer = filteredValue; this.status = 'answered'; // Re-render prompt this.render(); this.screen.done(); this.done(state.value); }.bind(this)); }; Prompt.prototype.onError = function(state) { this.render(state.isValid); }; /** * When user press a key */ Prompt.prototype.onKeypress = function() { this.render(); };