173 lines
3.7 KiB
JavaScript
173 lines
3.7 KiB
JavaScript
/**
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* `list` 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 figures = require("figures");
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var cliCursor = require("cli-cursor");
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var Base = require("./base");
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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.firstRender = true;
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this.selected = 0;
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var def = this.opt.default;
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// Default being a Number
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if ( _.isNumber(def) && def >= 0 && def < this.opt.choices.realLength ) {
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this.selected = def;
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}
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// Default being a String
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if ( _.isString(def) ) {
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this.selected = this.opt.choices.pluck("value").indexOf( 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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var events = observe(this.rl);
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events.normalizedUpKey.takeUntil( events.line ).forEach( this.onUpKey.bind(this) );
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events.normalizedDownKey.takeUntil( events.line ).forEach( this.onDownKey.bind(this) );
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events.numberKey.takeUntil( events.line ).forEach( this.onNumberKey.bind(this) );
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events.line.take(1).forEach( this.onSubmit.bind(this) );
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// Init the prompt
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cliCursor.hide();
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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() {
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// Render question
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var message = this.getQuestion();
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if ( this.firstRender ) {
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message += chalk.dim( "(Use arrow keys)" );
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}
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// Render choices or answer depending on the state
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if ( this.status === "answered" ) {
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message += chalk.cyan( this.opt.choices.getChoice(this.selected).short );
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} else {
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var choicesStr = listRender(this.opt.choices, this.selected );
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var indexPosition = this.opt.choices.indexOf(this.opt.choices.getChoice(this.selected));
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message += "\n" + this.paginator.paginate(choicesStr, indexPosition, this.opt.pageSize);
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}
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this.firstRender = false;
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this.screen.render(message);
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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.onSubmit = function() {
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var choice = this.opt.choices.getChoice( this.selected );
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this.status = "answered";
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// Rerender prompt
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this.render();
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this.screen.done();
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cliCursor.show();
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this.done( choice.value );
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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.onUpKey = function() {
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var len = this.opt.choices.realLength;
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this.selected = (this.selected > 0) ? this.selected - 1 : len - 1;
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this.render();
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};
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Prompt.prototype.onDownKey = function() {
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var len = this.opt.choices.realLength;
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this.selected = (this.selected < len - 1) ? this.selected + 1 : 0;
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this.render();
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};
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Prompt.prototype.onNumberKey = function( input ) {
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if ( input <= this.opt.choices.realLength ) {
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this.selected = input - 1;
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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 listRender(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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if (choice.type === 'separator') {
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separatorOffset++;
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output += ' ' + choice + '\n';
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return;
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}
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var isSelected = (i - separatorOffset === pointer);
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var line = (isSelected ? figures.pointer + ' ' : ' ') + choice.name;
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if (isSelected) {
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line = chalk.cyan(line);
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}
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output += line + ' \n';
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});
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return output.replace(/\n$/, '');
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}
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