forked from zhurui/management
105 lines
1.9 KiB
JavaScript
105 lines
1.9 KiB
JavaScript
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/**
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* `input` type prompt
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*/
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var util = require('util');
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var chalk = require('chalk');
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var Base = require('./base');
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var observe = require('../utils/events');
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/**
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* Module exports
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*/
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module.exports = Prompt;
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/**
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* Constructor
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*/
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function Prompt() {
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return Base.apply(this, arguments);
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}
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util.inherits(Prompt, Base);
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/**
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* Start the Inquiry session
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* @param {Function} cb Callback when prompt is done
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* @return {this}
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*/
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Prompt.prototype._run = function (cb) {
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this.done = cb;
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// Once user confirm (enter key)
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var events = observe(this.rl);
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var submit = events.line.map(this.filterInput.bind(this));
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var validation = this.handleSubmitEvents(submit);
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validation.success.forEach(this.onEnd.bind(this));
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validation.error.forEach(this.onError.bind(this));
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events.keypress.takeUntil(validation.success).forEach(this.onKeypress.bind(this));
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// Init
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this.render();
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return this;
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};
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/**
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* Render the prompt to screen
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* @return {Prompt} self
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*/
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Prompt.prototype.render = function (error) {
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var bottomContent = '';
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var message = this.getQuestion();
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if (this.status === 'answered') {
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message += chalk.cyan(this.answer);
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} else {
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message += this.rl.line;
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}
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if (error) {
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bottomContent = chalk.red('>> ') + error;
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}
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this.screen.render(message, bottomContent);
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};
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/**
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* When user press `enter` key
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*/
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Prompt.prototype.filterInput = function (input) {
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if (!input) {
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return this.opt.default == null ? '' : this.opt.default;
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}
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return input;
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};
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Prompt.prototype.onEnd = function (state) {
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this.answer = state.value;
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this.status = 'answered';
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// Re-render prompt
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this.render();
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this.screen.done();
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this.done(state.value);
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};
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Prompt.prototype.onError = function (state) {
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this.render(state.isValid);
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};
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/**
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* When user press a key
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*/
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Prompt.prototype.onKeypress = function () {
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this.render();
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};
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