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