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build/node_modules/inquirer/lib/prompts/list.js

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+/**
+ * `list` type prompt
+ */
+
+var _ = require("lodash");
+var util = require("util");
+var chalk = require("chalk");
+var figures = require("figures");
+var cliCursor = require("cli-cursor");
+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;
+
+  // Default being a Number
+  if ( _.isNumber(def) && def >= 0 && def < this.opt.choices.realLength ) {
+    this.selected = def;
+  }
+
+  // Default being a String
+  if ( _.isString(def) ) {
+    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 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).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() {
+  var choice = this.opt.choices.getChoice( this.selected );
+  this.status = "answered";
+
+  // Rerender prompt
+  this.render();
+
+  this.screen.done();
+  cliCursor.show();
+  this.done( choice.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;
+    }
+
+    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$/, '');
+}