184 lines
3.7 KiB
JavaScript
184 lines
3.7 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( index ) {
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return this.opt.choices.getChoice( index ) != null;
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}.bind(this)
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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.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 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.opt.choices.getChoice(this.selected).name);
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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.filterInput = function( input ) {
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if ( input == null || input === "" ) {
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return this.rawDefault;
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} else {
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return input - 1;
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}
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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.selected = state.value;
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var selectedChoice = this.opt.choices.getChoice( this.selected );
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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( selectedChoice.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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