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250 lines
6.1 KiB
250 lines
6.1 KiB
'use strict';
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const assert = require('assert');
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const Events = require('events');
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const utils = require('./lib/utils');
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/**
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* Create an instance of `Enquirer`.
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*
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* ```js
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* const Enquirer = require('enquirer');
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* const enquirer = new Enquirer();
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* ```
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* @name Enquirer
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* @param {Object} `options` (optional) Options to use with all prompts.
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* @param {Object} `answers` (optional) Answers object to initialize with.
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* @api public
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*/
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class Enquirer extends Events {
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constructor(options, answers) {
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super();
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this.options = utils.merge({}, options);
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this.answers = { ...answers };
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}
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/**
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* Register a custom prompt type.
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*
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* ```js
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* const Enquirer = require('enquirer');
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* const enquirer = new Enquirer();
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* enquirer.register('customType', require('./custom-prompt'));
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* ```
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* @name register()
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* @param {String} `type`
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* @param {Function|Prompt} `fn` `Prompt` class, or a function that returns a `Prompt` class.
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* @return {Object} Returns the Enquirer instance
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* @api public
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*/
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register(type, fn) {
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if (utils.isObject(type)) {
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for (let key of Object.keys(type)) this.register(key, type[key]);
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return this;
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}
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assert.equal(typeof fn, 'function', 'expected a function');
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let name = type.toLowerCase();
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if (fn.prototype instanceof this.Prompt) {
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this.prompts[name] = fn;
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} else {
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this.prompts[name] = fn(this.Prompt, this);
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}
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return this;
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}
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/**
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* Prompt function that takes a "question" object or array of question objects,
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* and returns an object with responses from the user.
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*
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* ```js
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* const Enquirer = require('enquirer');
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* const enquirer = new Enquirer();
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*
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* const response = await enquirer.prompt({
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* type: 'input',
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* name: 'username',
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* message: 'What is your username?'
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* });
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* console.log(response);
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* ```
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* @name prompt()
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* @param {Array|Object} `questions` Options objects for one or more prompts to run.
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* @return {Promise} Promise that returns an "answers" object with the user's responses.
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* @api public
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*/
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async prompt(questions = []) {
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for (let question of [].concat(questions)) {
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try {
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if (typeof question === 'function') question = await question.call(this);
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await this.ask(utils.merge({}, this.options, question));
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} catch (err) {
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return Promise.reject(err);
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}
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}
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return this.answers;
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}
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async ask(question) {
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if (typeof question === 'function') {
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question = await question.call(this);
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}
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let opts = utils.merge({}, this.options, question);
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let { type, name } = question;
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let { set, get } = utils;
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if (typeof type === 'function') {
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type = await type.call(this, question, this.answers);
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}
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if (!type) return this.answers[name];
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assert(this.prompts[type], `Prompt "${type}" is not registered`);
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let prompt = new this.prompts[type](opts);
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let value = get(this.answers, name);
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prompt.state.answers = this.answers;
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prompt.enquirer = this;
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if (name) {
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prompt.on('submit', value => {
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this.emit('answer', name, value, prompt);
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set(this.answers, name, value);
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});
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}
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// bubble events
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let emit = prompt.emit.bind(prompt);
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prompt.emit = (...args) => {
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this.emit.call(this, ...args);
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return emit(...args);
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};
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this.emit('prompt', prompt, this);
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if (opts.autofill && value != null) {
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prompt.value = prompt.input = value;
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// if "autofill=show" render the prompt, otherwise stay "silent"
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if (opts.autofill === 'show') {
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await prompt.submit();
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}
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} else {
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value = prompt.value = await prompt.run();
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}
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return value;
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}
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/**
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* Use an enquirer plugin.
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*
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* ```js
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* const Enquirer = require('enquirer');
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* const enquirer = new Enquirer();
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* const plugin = enquirer => {
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* // do stuff to enquire instance
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* };
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* enquirer.use(plugin);
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* ```
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* @name use()
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* @param {Function} `plugin` Plugin function that takes an instance of Enquirer.
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* @return {Object} Returns the Enquirer instance.
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* @api public
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*/
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use(plugin) {
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plugin.call(this, this);
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return this;
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}
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set Prompt(value) {
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this._Prompt = value;
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}
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get Prompt() {
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return this._Prompt || this.constructor.Prompt;
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}
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get prompts() {
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return this.constructor.prompts;
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}
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static set Prompt(value) {
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this._Prompt = value;
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}
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static get Prompt() {
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return this._Prompt || require('./lib/prompt');
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}
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static get prompts() {
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return require('./lib/prompts');
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}
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static get types() {
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return require('./lib/types');
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}
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/**
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* Prompt function that takes a "question" object or array of question objects,
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* and returns an object with responses from the user.
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*
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* ```js
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* const { prompt } = require('enquirer');
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* const response = await prompt({
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* type: 'input',
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* name: 'username',
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* message: 'What is your username?'
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* });
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* console.log(response);
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* ```
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* @name Enquirer#prompt
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* @param {Array|Object} `questions` Options objects for one or more prompts to run.
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* @return {Promise} Promise that returns an "answers" object with the user's responses.
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* @api public
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*/
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static get prompt() {
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const fn = (questions, ...rest) => {
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let enquirer = new this(...rest);
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let emit = enquirer.emit.bind(enquirer);
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enquirer.emit = (...args) => {
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fn.emit(...args);
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return emit(...args);
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};
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return enquirer.prompt(questions);
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};
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utils.mixinEmitter(fn, new Events());
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return fn;
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}
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}
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utils.mixinEmitter(Enquirer, new Events());
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const prompts = Enquirer.prompts;
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for (let name of Object.keys(prompts)) {
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let key = name.toLowerCase();
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let run = options => new prompts[name](options).run();
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Enquirer.prompt[key] = run;
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Enquirer[key] = run;
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if (!Enquirer[name]) {
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Reflect.defineProperty(Enquirer, name, { get: () => prompts[name] });
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}
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}
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const exp = name => {
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utils.defineExport(Enquirer, name, () => Enquirer.types[name]);
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};
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exp('ArrayPrompt');
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exp('AuthPrompt');
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exp('BooleanPrompt');
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exp('NumberPrompt');
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exp('StringPrompt');
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module.exports = Enquirer;
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