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

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+/**
+ * `rawlist` type prompt
+ */
+
+var _ = require("lodash");
+var util = require("util");
+var chalk = require("chalk");
+var Base = require("./base");
+var Separator = require("../objects/separator");
+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.opt.validChoices = this.opt.choices.filter(Separator.exclude);
+
+  this.selected = 0;
+  this.rawDefault = 0;
+
+  _.extend(this.opt, {
+    validate: function( index ) {
+      return this.opt.choices.getChoice( index ) != null;
+    }.bind(this)
+  });
+
+  var def = this.opt.default;
+  if ( _.isNumber(def) && def >= 0 && def < this.opt.choices.realLength ) {
+    this.selected = this.rawDefault = 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;
+
+  // Once user confirm (enter key)
+  var events = observe(this.rl);
+  var submit = events.line.map( this.filterInput.bind(this) );
+
+  var validation = this.handleSubmitEvents( submit );
+  validation.success.forEach( this.onEnd.bind(this) );
+  validation.error.forEach( this.onError.bind(this) );
+
+  events.keypress.takeUntil( validation.success ).forEach( this.onKeypress.bind(this) );
+
+  // Init the prompt
+  this.render();
+
+  return this;
+};
+
+
+/**
+ * Render the prompt to screen
+ * @return {Prompt} self
+ */
+
+Prompt.prototype.render = function (error) {
+  // Render question
+  var message = this.getQuestion();
+  var bottomContent = '';
+
+  if ( this.status === "answered" ) {
+    message += chalk.cyan(this.opt.choices.getChoice(this.selected).name);
+  } else {
+    var choicesStr = renderChoices(this.opt.choices, this.selected);
+    message += this.paginator.paginate(choicesStr, this.selected, this.opt.pageSize);
+    message += "\n  Answer: ";
+  }
+
+  message += this.rl.line;
+
+  if (error) {
+    bottomContent = '\n' + chalk.red('>> ') + error;
+  }
+
+  this.screen.render(message, bottomContent);
+};
+
+/**
+ * When user press `enter` key
+ */
+
+Prompt.prototype.filterInput = function( input ) {
+  if ( input == null || input === "" ) {
+    return this.rawDefault;
+  } else {
+    return input - 1;
+  }
+};
+
+Prompt.prototype.onEnd = function( state ) {
+  this.status = "answered";
+  this.selected = state.value;
+
+  var selectedChoice = this.opt.choices.getChoice( this.selected );
+
+  // Re-render prompt
+  this.render();
+
+  this.screen.done();
+  this.done( selectedChoice.value );
+};
+
+Prompt.prototype.onError = function() {
+  this.render("Please enter a valid index");
+};
+
+/**
+ * When user press a key
+ */
+
+Prompt.prototype.onKeypress = function() {
+  var index = this.rl.line.length ? Number(this.rl.line) - 1 : 0;
+
+  if ( this.opt.choices.getChoice(index) ) {
+    this.selected = index;
+  } else {
+    this.selected = undefined;
+  }
+
+  this.render();
+};
+
+
+/**
+ * Function for rendering list choices
+ * @param  {Number} pointer Position of the pointer
+ * @return {String}         Rendered content
+ */
+
+function renderChoices(choices, pointer) {
+  var output = '';
+  var separatorOffset = 0;
+
+  choices.forEach(function (choice, i) {
+    output += '\n  ';
+
+    if (choice.type === 'separator') {
+      separatorOffset++;
+      output += ' ' + choice;
+      return;
+    }
+
+    var index = i - separatorOffset;
+    var display = (index + 1) + ') ' + choice.name;
+    if (index === pointer) {
+      display = chalk.cyan( display );
+    }
+    output += display;
+  });
+
+  return output;
+}