| /** |
| * `list` type prompt |
| */ |
| |
| var _ = require('lodash'); |
| var util = require('util'); |
| var chalk = require('chalk'); |
| var figures = require('figures'); |
| var cliCursor = require('cli-cursor'); |
| var runAsync = require('run-async'); |
| var Base = require('./base'); |
| var observe = require('../utils/events'); |
| var Paginator = require('../utils/paginator'); |
| |
| /** |
| * Module exports |
| */ |
| |
| module.exports = Prompt; |
| |
| /** |
| * Constructor |
| */ |
| |
| function Prompt() { |
| Base.apply(this, arguments); |
| |
| if (!this.opt.choices) { |
| this.throwParamError('choices'); |
| } |
| |
| this.firstRender = true; |
| this.selected = 0; |
| |
| var def = this.opt.default; |
| |
| // If def is a Number, then use as index. Otherwise, check for value. |
| if (_.isNumber(def) && def >= 0 && def < this.opt.choices.realLength) { |
| this.selected = def; |
| } else if (!_.isNumber(def) && def != null) { |
| this.selected = this.opt.choices.pluck('value').indexOf(def); |
| } |
| |
| // Make sure no default is set (so it won't be printed) |
| this.opt.default = null; |
| |
| this.paginator = new Paginator(); |
| } |
| util.inherits(Prompt, Base); |
| |
| /** |
| * Start the Inquiry session |
| * @param {Function} cb Callback when prompt is done |
| * @return {this} |
| */ |
| |
| Prompt.prototype._run = function (cb) { |
| this.done = cb; |
| |
| var self = this; |
| |
| var events = observe(this.rl); |
| events.normalizedUpKey.takeUntil(events.line).forEach(this.onUpKey.bind(this)); |
| events.normalizedDownKey.takeUntil(events.line).forEach(this.onDownKey.bind(this)); |
| events.numberKey.takeUntil(events.line).forEach(this.onNumberKey.bind(this)); |
| events.line |
| .take(1) |
| .map(this.getCurrentValue.bind(this)) |
| .flatMap(function (value) { |
| return runAsync(self.opt.filter)(value).catch(function (err) { |
| return err; |
| }); |
| }) |
| .forEach(this.onSubmit.bind(this)); |
| |
| // Init the prompt |
| cliCursor.hide(); |
| this.render(); |
| |
| return this; |
| }; |
| |
| /** |
| * Render the prompt to screen |
| * @return {Prompt} self |
| */ |
| |
| Prompt.prototype.render = function () { |
| // Render question |
| var message = this.getQuestion(); |
| |
| if (this.firstRender) { |
| message += chalk.dim('(Use arrow keys)'); |
| } |
| |
| // Render choices or answer depending on the state |
| if (this.status === 'answered') { |
| message += chalk.cyan(this.opt.choices.getChoice(this.selected).short); |
| } else { |
| var choicesStr = listRender(this.opt.choices, this.selected); |
| var indexPosition = this.opt.choices.indexOf(this.opt.choices.getChoice(this.selected)); |
| message += '\n' + this.paginator.paginate(choicesStr, indexPosition, this.opt.pageSize); |
| } |
| |
| this.firstRender = false; |
| |
| this.screen.render(message); |
| }; |
| |
| /** |
| * When user press `enter` key |
| */ |
| |
| Prompt.prototype.onSubmit = function (value) { |
| this.status = 'answered'; |
| |
| // Rerender prompt |
| this.render(); |
| |
| this.screen.done(); |
| cliCursor.show(); |
| this.done(value); |
| }; |
| |
| Prompt.prototype.getCurrentValue = function () { |
| return this.opt.choices.getChoice(this.selected).value; |
| }; |
| |
| /** |
| * When user press a key |
| */ |
| Prompt.prototype.onUpKey = function () { |
| var len = this.opt.choices.realLength; |
| this.selected = (this.selected > 0) ? this.selected - 1 : len - 1; |
| this.render(); |
| }; |
| |
| Prompt.prototype.onDownKey = function () { |
| var len = this.opt.choices.realLength; |
| this.selected = (this.selected < len - 1) ? this.selected + 1 : 0; |
| this.render(); |
| }; |
| |
| Prompt.prototype.onNumberKey = function (input) { |
| if (input <= this.opt.choices.realLength) { |
| this.selected = input - 1; |
| } |
| this.render(); |
| }; |
| |
| /** |
| * Function for rendering list choices |
| * @param {Number} pointer Position of the pointer |
| * @return {String} Rendered content |
| */ |
| function listRender(choices, pointer) { |
| var output = ''; |
| var separatorOffset = 0; |
| |
| choices.forEach(function (choice, i) { |
| if (choice.type === 'separator') { |
| separatorOffset++; |
| output += ' ' + choice + '\n'; |
| return; |
| } |
| |
| if (choice.disabled) { |
| separatorOffset++; |
| output += ' - ' + choice.name; |
| output += ' (' + (_.isString(choice.disabled) ? choice.disabled : 'Disabled') + ')'; |
| output += '\n'; |
| return; |
| } |
| |
| var isSelected = (i - separatorOffset === pointer); |
| var line = (isSelected ? figures.pointer + ' ' : ' ') + choice.name; |
| if (isSelected) { |
| line = chalk.cyan(line); |
| } |
| output += line + ' \n'; |
| }); |
| |
| return output.replace(/\n$/, ''); |
| } |