Inquirer.js: Allow users to write a list response - yeoman

Question

Alright I'm stuck creating a yeoman generator. I have a prompt that brings up a list of three different options to choose from. It looks like this:
Name of JS file:
- One
- Two
- Other
I want the third one to allow the option to allow the user to write their own. Mabye I can call another prompt method?
// ****************************************************************************
// Author: Daniel Jenkins
// Date: 03/35/3015
// Purpose: A generator for creating js files including, name, date, and purpose fields.
// ****************************************************************************
var generators = require('yeoman-generator');
module.exports = generators.Base.extend({
prompting: function() {
var done = this.async();
var myChoices = [this.appname, 'one', 'two', 'other'];
var prompts = {
type: 'list',
name: 'fileName',
message: 'Name of new JS file: ',
choices: myChoices
};
// Select the filename from list.
this.prompt(prompts, function(answers) {
// Store user input as an argument for the EJS preprossor.
this.context = {
fileName: answers.fileName,
};
done();
}.bind(this));
},
// Add file after filling in EJS template
copyMainFiles: function() {
// Create a time object for todays date.
var my_date = new Date();
// Add date property.
this.context.fileDate = my_date.toDateString();
// Run through EJS and create the file.
this.template("_index.js", this.context.fileName + ".js", this.context);
}
});

Answer 1

You can use when, to specify another field is called when by running a conditional statement. If the statement return true the field will be called else it will be skipped.
See the addition to your code:
module.exports = generators.Base.extend( {
prompting : function () {
var done = this.async();
var myChoices = [ this.appname, 'one', 'two', 'other' ];
var prompts = [ {
type : 'list',
name : 'fileName',
message : 'Name of new JS file: ',
choices : myChoices
},{
when : function ( answers ) {
return answers.fileName === 'other';
},
type : 'input',
name : 'fileName',
message : 'custom file name'
}];
// Select the filename from list.
this.prompt( prompts, function ( answers ) {
// Store user input as an argument for the EJS preprossor.
this.context = {
fileName : answers.fileName,
};
done();
}.bind( this ) );
},
// Add file after filling in EJS template
copyMainFiles : function () {
// Create a time object for todays date.
var my_date = new Date();
// Add date property.
this.context.fileDate = my_date.toDateString();
// Run through EJS and create the file.
this.template( "_index.js", this.context.fileName + ".js", this.context );
}
} );