Factory

Quick and easy template scaffolding for Node

Installation

npm install factory

Example

var factory = require('factory');

var widgetFactory = factory({
	template: 'templates/widget',
	placeholders: [
		{
			name: 'foo',
			type: 'input',
			message: 'Enter a value for foo'
		},
		{
			name: 'bar',
			type: 'input',
			message: 'Enter a value for bar'
		}
	]
});

var options = {
	destination: 'app/widgets',
	overwrite: true,
};
var context = {
	foo: 'baz'
};

// Node-style callback interface
widgetFactory(options, context, function(error, results) {
	if (error) {
		console.error('Widget creation failed: ' + error);
	} else {
		console.info('Widget created successfully');
	}
});

// Promise interface
widgetFactory(options, context)
	.then(function(results) {
		console.info('Widget created successfully');
	}).catch(function(error) {
		console.error('Widget creation failed: ' + error);
	});

Contents of templates/widget/<%= foo %>.js:

module.exports = function <%= foo %>() {
	console.log('<%= bar %>');
};

Output at app/widgets/baz.js:

module.exports = function baz() {
	console.log('[user-prompted value]');
};

How it works

• Call the factory() function with the following parameters:
  • template: path to the template folder
  • placeholders: (optional) array of inquirer prompts used to gather data for injecting into templates
  • getContext: (optional) function that transforms placeholder values before they are passed to the template
• You can then call the function that is returned, specifying a destination path and any copy options, and optionally passing in a key/value object containing template placeholder values
• The user is prompted for the value of any placeholders which were not provided in the placeholder values object
• The files are copied from the template folder to the destination folder, replacing any placeholders in filenames and file content with the supplied values (using lodash template syntax)

Usage

factory(options)

Create a factory from an existing template

Template filenames/contents can use lodash template syntax to specify placeholder values. These are injected into the template when the factory function is invoked.

Options:

Name	Type	Required	Default	Description
template	string	Yes	N/A	Path to the template folder
placeholders	Array	No	[]	Array of inquirer prompts used to gather data for injecting into templates
getContext	function	No	null	Function that transforms placeholder values before they are passed to the template

Notes:

• getContext has the following signature:

  function(context)

  Arguments:

  Name	Type	Description
  context	object	Key/value object containing placeholder values, gathered from factory context and template placeholders

  Returns:

  object Key/value object containing transformed context placeholder for use in templates

Returns:

• function(options, [context], [callback])

  Factory function used to create instances of the template

  The user will be prompted for the value of any placeholders which are not specified in the context object.

  Options:

  Name	Type	Required	Default	Description
  options.destination	string	Yes	N/A	Destination directory for output files
  options.overwrite	boolean	No	false	Whether to overwrite existing files
  context	object	No	{}	Preset template placeholder values
  callback	function	No	null	Node-style callback that is invoked when the operation completes/fails

  Returns:

  Promise<Array> Promise, fulfilled with array of copy results:

   [
   	{
   		"src": "/path/to/src",
   		"dest": "/path/to/dest",
   		"stats": <Stats>
   	},
   	{
   		"src": "/path/to/src/file.txt",
   		"dest": "/path/to/dest/file.txt",
   		"stats": <Stats>
   	},
   	{
   		"src": "/path/to/src/subfolder",
   		"dest": "/path/to/dest/subfolder",
   		"stats": <Stats>
   	},
   	{
   		"src": "/path/to/src/subfolder/nested.txt",
   		"dest": "/path/to/dest/subfolder/nested.txt",
   		"stats": <Stats>
   	}
   ]

Events

The value returned by the generated factory function implements the EventEmitter interface, and emits the following events:

Event	Handler signature
factory.events.ERROR	function(error, ErrorInfo)
factory.events.COMPLETE	function(Array<CopyOperation>)
factory.events.CREATE_DIRECTORY_START	function(CopyOperation)
factory.events.CREATE_DIRECTORY_ERROR	function(error, CopyOperation)
factory.events.CREATE_DIRECTORY_COMPLETE	function(CopyOperation)
factory.events.CREATE_SYMLINK_START	function(CopyOperation)
factory.events.CREATE_SYMLINK_ERROR	function(error, CopyOperation)
factory.events.CREATE_SYMLINK_COMPLETE	function(CopyOperation)
factory.events.COPY_FILE_START	function(CopyOperation)
factory.events.COPY_FILE_ERROR	function(error, CopyOperation)
factory.events.COPY_FILE_COMPLETE	function(CopyOperation)

...where the types referred to in the handler signature are as follows:

ErrorInfo

Property	Type	Description
src	string	Source path of the file/folder/symlink that failed to copy
dest	string	Destination path of the file/folder/symlink that failed to copy

CopyOperation

Property	Type	Description
src	string	Source path of the relevant file/folder/symlink
dest	string	Destination path of the relevant file/folder/symlink
stats	fs.Stats	Stats for the relevant file/folder/symlink

Example: using events

var factory = require('factory');

var widgetFactory = factory({
	template: 'templates/widget'
});

var options = {
	destination: 'app/widgets'
};
var context = {};
widgetFactory(options, context)
	.on(factory.events.COPY_FILE_START, function(copyOperation) {
		console.info('Copying file ' + copyOperation.src + '...');
	})
	.on(factory.events.COPY_FILE_COMPLETE, function(copyOperation) {
		console.info('Copied to ' + copyOperation.dest);
	})
	.on(factory.events.ERROR, function(error, copyOperation) {
		console.error('Unable to copy ' + copyOperation.dest);
	})
	.then(function(results) {
		console.info('Widget created successfully');
	}).catch(function(error) {
		console.error('Widget creation failed: ' + error);
	});