| /** |
| * `rawlist` type prompt |
| */ |
| |
| var _ = require('lodash'); |
| var util = require('util'); |
| var chalk = require('chalk'); |
| var Base = require('./base'); |
| var Separator = require('../objects/separator'); |
| var observe = require('../utils/events'); |
| var Paginator = require('../utils/paginator'); |
| |
| /** |
| * Module exports |
| */ |
| |
| module.exports = Prompt; |
| |
| /** |
| * Constructor |
| */ |
| |
| function Prompt() { |
| Base.apply(this, arguments); |
| |
| if (!this.opt.choices) { |
| this.throwParamError('choices'); |
| } |
| |
| this.opt.validChoices = this.opt.choices.filter(Separator.exclude); |
| |
| this.selected = 0; |
| this.rawDefault = 0; |
| |
| _.extend(this.opt, { |
| validate: function (val) { |
| return val != null; |
| } |
| }); |
| |
| var def = this.opt.default; |
| if (_.isNumber(def) && def >= 0 && def < this.opt.choices.realLength) { |
| this.selected = this.rawDefault = def; |
| } |
| |
| // Make sure no default is set (so it won't be printed) |
| this.opt.default = null; |
| |
| this.paginator = new Paginator(); |
| } |
| 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.getCurrentValue.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 the prompt |
| this.render(); |
| |
| return this; |
| }; |
| |
| /** |
| * Render the prompt to screen |
| * @return {Prompt} self |
| */ |
| |
| Prompt.prototype.render = function (error) { |
| // Render question |
| var message = this.getQuestion(); |
| var bottomContent = ''; |
| |
| if (this.status === 'answered') { |
| message += chalk.cyan(this.answer); |
| } else { |
| var choicesStr = renderChoices(this.opt.choices, this.selected); |
| message += this.paginator.paginate(choicesStr, this.selected, this.opt.pageSize); |
| message += '\n Answer: '; |
| } |
| |
| message += this.rl.line; |
| |
| if (error) { |
| bottomContent = '\n' + chalk.red('>> ') + error; |
| } |
| |
| this.screen.render(message, bottomContent); |
| }; |
| |
| /** |
| * When user press `enter` key |
| */ |
| |
| Prompt.prototype.getCurrentValue = function (index) { |
| if (index == null || index === '') { |
| index = this.rawDefault; |
| } else { |
| index -= 1; |
| } |
| |
| var choice = this.opt.choices.getChoice(index); |
| return choice ? choice.value : null; |
| }; |
| |
| Prompt.prototype.onEnd = function (state) { |
| this.status = 'answered'; |
| this.answer = state.value; |
| |
| // Re-render prompt |
| this.render(); |
| |
| this.screen.done(); |
| this.done(state.value); |
| }; |
| |
| Prompt.prototype.onError = function () { |
| this.render('Please enter a valid index'); |
| }; |
| |
| /** |
| * When user press a key |
| */ |
| |
| Prompt.prototype.onKeypress = function () { |
| var index = this.rl.line.length ? Number(this.rl.line) - 1 : 0; |
| |
| if (this.opt.choices.getChoice(index)) { |
| this.selected = index; |
| } else { |
| this.selected = undefined; |
| } |
| |
| this.render(); |
| }; |
| |
| /** |
| * Function for rendering list choices |
| * @param {Number} pointer Position of the pointer |
| * @return {String} Rendered content |
| */ |
| |
| function renderChoices(choices, pointer) { |
| var output = ''; |
| var separatorOffset = 0; |
| |
| choices.forEach(function (choice, i) { |
| output += '\n '; |
| |
| if (choice.type === 'separator') { |
| separatorOffset++; |
| output += ' ' + choice; |
| return; |
| } |
| |
| var index = i - separatorOffset; |
| var display = (index + 1) + ') ' + choice.name; |
| if (index === pointer) { |
| display = chalk.cyan(display); |
| } |
| output += display; |
| }); |
| |
| return output; |
| } |