don't get choices until prompt is run

Author: jonschlinkert

examples/prompt.choices-function.js

@@ -5,6 +5,7 @@ var prompt = new Prompt({
   name: 'colors',
   message: 'What are your favorite colors?',
   choices: function() {
+    console.log('should be second');
     return [
       {name: 'red', category: 'foo'},
       {name: 'blue', category: 'bar', disabled: true},
@@ -16,7 +17,7 @@ var prompt = new Prompt({
     ]
   }
 });
-
+console.log('should be first');
 prompt.run(answers)
   .then(function(answer) {
     console.log(answer)

index.js

@@ -11,7 +11,6 @@ var cyan = require('ansi-cyan');
 function Checkbox() {
   debug('initializing from <%s>', __filename);
   Prompt.apply(this, arguments);
-  this.choices.options.filterList = true;
   this.errorMessage = null;
   this.infoMessage = this.options.infoMessage || '(Press '
     + cyan('<space>')
@@ -29,6 +28,7 @@ Prompt.extend(Checkbox);
  */
 
 Checkbox.prototype.renderOutput = function() {
+  this.choices.options.filterList = true;
   return this.choices.render(this.position, this.question.options);
 };