node-ff-assets
=========

A Node.js library providing automatic site assets aggregation.

## Installation

  npm install node-ff-assets --save

## Example Application

  There is a fully working bootstrap with angularjs example in the example folder.

## Usage

	// note1: www_static/[js/css]/lib is version ignored.
	// note2: server routes;
	//   app.use('/static',                  express.static(path.join(__dirname,'www_static')));
	//   app.use('/static/module/flot',      express.static(path.join(__dirname,'node_modules/flot/dist')));
	//   app.use('/static/module/bootstrap', express.static(path.join(__dirname,'node_modules/bootstrap/dist')));
	
	var assets   = require('node-ff-assets');
	
	var assetsConfig = {
		// Map from uri paths to file systems paths.
		linkMapping : {
			'/static/module/bootstrap/': 'node_modules/bootstrap/dist/',
			'/static/module/flot/':      'node_modules/flot/',
			'/static/':                  'www_static/',
		},
		// Site sources in html page.
		linkSourcesCss : [
			'/static/module/bootstrap/css/bootstrap.css',
		],
		linkSourcesJs : [
			'/static/js/lib/jquery-2.1.3/jquery.js@http://code.jquery.com/jquery-2.1.3.js',
			'/static/module/bootstrap/js/bootstrap.js',
			'/static/module/flot/jquery.flot.js',
			'/static/module/flot/jquery.flot.resize.js',
			'/static/module/flot/jquery.flot.pie.js',
			'/static/js/lib/angularjs-1.4.0-b4/angular.js@https://code.angularjs.org/1.4.0-beta.4/angular.js',
			'/static/js/lib/angularjs-1.4.0-b4/angular-route.js@https://code.angularjs.org/1.4.0-beta.4/angular-route.js',
			'/static/js/lib/angularjs-1.4.0-b4/angular-resource.js@https://code.angularjs.org/1.4.0-beta.4/angular-resource.js',
			'/static/js/lib/angularjs-1.4.0-b4/angular-touch.js@https://code.angularjs.org/1.4.0-beta.4/angular-touch.js',
		],
	};
	
	// callback helper to return an assembler config per asset type
	function createBuildConfig(type) {
		return function(callback) {
			// Override rendered result from command line
			var singleResult = 'false' != process.env.DEV_ASSETS_SINGLE_RESULT;
			if (type == 'css') {
				callback(null,{
					linkMapping: assetsConfig.linkMapping,
					linkTargetSingleResult: singleResult,
					linkTarget: '/static/css/lib/assets.css',
					linkSources: assetsConfig.linkSourcesCss,
					assetType: type,
				});
			} else {
				callback(null, {
					linkTargetSingleResult: singleResult,
					linkMapping: assetsConfig.linkMapping,
					linkTarget: '/static/js/lib/assets.js',
					linkSources: assetsConfig.linkSourcesJs,
					assetType: type,
				});
			}
		}
	}
	
	function buildAssets(server,callbackDone) {
		assets.build({
			assets: {
				js: {
					configCreate: createBuildConfig('js'),
					configFill: function (config, callback) {
						async.series([
							assets.factory.lib.async.pushLinkSources(config,  '/static/js/',             'www_static/js/'),
							assets.factory.lib.async.pushLinkSources(config,  '/static/js/controller/',  'www_static/js/controller/'),
						],callback);
					},
				},
				css: {
					configCreate: createBuildConfig('css'),
					configFill: function (config, callback) {
						async.series([
							assets.factory.lib.async.pushLinkSources(config, '/static/css/',            'www_static/css/'),
						],callback);
						
					},
					assemblerCreate: function (assemblerConfig, callback) {
						callback(null,new assets.AssetAssembler(assemblerConfig,assets.factory.assembler.constructor.readFileMinify()));
					},
				},
			},
			assemblerFill: function (assembler, callback) {
				var serverResultKey = 'ff_assets_'+assembler.config.assetType;
				assembler.on ('log',    assets.factory.assembler.event.log.console(assembler.config.assetType));
				assembler.on ('result', assets.factory.assembler.event.result.objectSet(server,serverResultKey));
				callback();
			},
		},callbackDone);
	}
	
	exports.build = function(server) {
		buildAssets(server,function(err) {
			if (err) {
				throw err;
			}
			console.log('Server init done.');
			// init other stuff...
		});
	}
	

## Config options

  The config option of the objects are filled from config templates with defaults.

### Builder Config

  Only configCreate if required to set in root and/or in asset.

	var template = {
		buildOrder: ['css','js'],
		
		configCreate:    null,
		configFill:      factory.builder.configCreate.nop(),
		assemblerCreate: factory.builder.assemblerCreate.readFile(),
		assemblerFill:   factory.builder.configCreate.nop(),
		
		assets: {
			js: {
				configCreate: null,
				configFill: null,
				assemblerCreate: null,
				assemblerFill: null,
			},
			css: {
				configCreate: null,
				configFill: null,
				assemblerCreate: null,
				assemblerFill: null,
			},
		},
	};

### Assembler Config

  required: assetType,linkTarget,linkSources and linkMapping.
  
	var name = 'node-ff-assets';
	var downloadTimeout  = (1000*10)   * 6;  // 1min
	var downloadMaxSize  = (1024*1024) * 10; // 10mb
	
	var template = {
		downloadStartDelay: null,
		downloadForce: false,
		downloadOptions: {
			timeout: downloadTimeout,
			maxResponseLength: downloadMaxSize,
			agent: name+' remote fetcher',
		},
		
		linkTargetSingleResult: true,
		linkTarget: null,
		linkSources: [],
		linkMapping: [],
		
		assetType: null,
		assetHeader: '\n/* '+name+': begin */\n\n',
		assetFooter: '\n/* '+name+': end */\n\n',
		assetSeperator: '\n/* '+name+': next */\n',
	};

### Assembler Download Force

  Sometimes its needed for have forces downloads of a resource.
  This can be done by adding an extra @ sign.
  
	linkSources: ['/static/js/lib/dynamic-generated.js@@http://localhost:8080/example-ui/include-js/generateModels'];
	
  note: if using localhost to download use the downloadStartDelay option so server is really up.

  The downloadForce option will redownload all resources of asset group.


## Target/Source locations

  The asset target file location is a derived value.
  
  Its created by mapping the assemblerConfig.linkTarget in the assemblerConfig.linkMapping keys
  to get a prefix for the local file system location.
  
  The same is also true for the assemblerConfig.linkSources list which are url paths
  which need to be mapped to the file system files by the assemblerConfig.linkMapping data.
  
	linkTarget: '/static/js/ffa/assets.js',
	linkMapping: ['/static/':'www_static/',],
	linkSources: ['/static/js/site.js','/static/js/ffa/jquery-2.1.3/jquery.js@http://code.jquery.com/jquery-2.1.3.js'],
	
  Result;
  
	public js  file: http://localhost:8080/static/js/site.js
	public js  file: http://localhost:8080/static/js/ffa/assets.js
	public js  file: http://localhost:8080/static/js/ffa/jquery-2.1.3/jquery.js
	filesystem file: www_static/js/site.js
	filesystem file: www_static/js/ffa/assets.js
	filesystem file: www_static/js/ffa/jquery-2.1.3/jquery.js
	.gitignore line: www_static/js/ffa
	
	if buildConfig.linkTargetSingleResult = true then result
	  static/js/ffa/assets.js
	else
	  static/js/site.js
	  static/js/ffa/jquery-2.1.3/jquery.js

## Objects

  For some use cases the assets.build(config,callback) is flexable enough.
  Then there are two objects which may provide the needed options.

### Object AssetsBuilder

	var assets = require('node-ff-assets');
	var builderConfig = {...};

	// Create builder
	var assetsBuilderA = new assets.AssetsBuilder(builderConfig);
	
	// Run all
	assetsBuilderB.runAll(function(err) {
		//done
	});
	
	// Run singles
	async.series([
		assetsBuilderC.runAsset('css'),
		assetsBuilderD.runAsset('js'),
	],function(err) {
		//done
	});
	

### Object AssetAssembler

	var assets = require('node-ff-assets');
	var assemblerConfig = {...};
	
	// Create default assembler.
	var assetAssemblerA = new assets.AssetAssembler(assemblerConfig);
	
	// Same as default, plain inclusion of content.
	var assetAssemblerB = new assets.AssetAssembler(assemblerConfig,assets.factory.assembler.constructor.readFile());
	
	// Minify content, with optional Minify config options.
	var assetAssemblerC = new assets.AssetAssembler(assemblerConfig,assets.factory.assembler.constructor.readFileMinify());
	var assetAssemblerD = new assets.AssetAssembler(assemblerConfig,assets.factory.assembler.constructor.readFileMinify(minifyOptions));
	
	// Third party content modifiers, with readFile function
	var assetAssemblerE = new assets.AssetAssembler(buildConfig,function(file,callback) {
		// should return file data to callback(err,data);
	);
	
	// Registrate events (note: may change a bit)
	assetAssemblerA.on('begin',               function() { });
	assetAssemblerA.on('end',                 function() { });
	assetAssemblerA.on('log',                 function(logLevel, logMessage) { });
	assetAssemblerA.on('error',               function(err) { });
	assetAssemblerA.on('result',              function(resultValue) { });
	assetAssemblerA.on('file-download-pre',   function(remoteUrl) { });
	assetAssemblerA.on('file-download-post',  function(localFile) { });
	assetAssemblerA.on('file-read-pre',       function(localFile) { });
	assetAssemblerA.on('file-read-post',      function(localFile) { });
	assetAssemblerA.on('file-write-pre',      function(targetFile) { });
	assetAssemblerA.on('file-write-post',     function(targetFile) { });
	
	// Use build in event functions
	assetAssemblerB.on('log',     assets.factory.assembler.event.log.console('css'));
	assetAssemblerB.on('result',  assets.factory.assembler.event.result.objectSet(server,'includeCssFiles'));
	
	// Run builder
	assetAssemblerC.run(function(err) {
		//done
	});

## Rendering

  In these examples I use the server (app/express) object to store the results in for displaying.
  Which the index page renderer will get and inject in page context.

	function renderIndex(app) {
		return function (req, res, next) {
			res.render('index', {
				includeCssFiles:    server.get('ff_assets_css'),
				includeJsFiles:     server.get('ff_assets_js'),
			});
		}
	};
	app.get('/',renderIndex(app));
	
	// Template
	index.jade
		doctype html
		html(lang='en',ng-app='ffUI')
		  head
		    base(href='/ui')
		    title='Index'
		    meta(charset='UTF-8')
		    meta(http-equiv='X-UA-Compatible' content='IE=edge')
		    meta(name='viewport' content='width=device-width, initial-scale=1')
		    meta(name='keywords' content='keywords')
		    each cssFile in includeCssFiles
		      link(rel='stylesheet' href='#{cssFile}')
		  body
		    div(id='wrapper')
		      div(ng-include='\'/ui/include/html/layout/header\'')
		      div(id='page-wrapper')
		        div(id='container-fluid')
		          div(ng-view)
		    div(ng-include='\'/ui/include/html/layout/footer\'')
		    each jsFile in includeJsFiles
		      script(src='#{jsFile}')

## Example log output

	// Result First run
	info: node-ff-assets-css build begin for: /static/css/lib/assets.css
	debug: node-ff-assets-css readFile: node_modules/bootstrap/dist/css/bootstrap.css size: 285496
	debug: node-ff-assets-css readFile: www_static/css/boot.css size: 1606
	debug: node-ff-assets-css readFile: www_static/css/flot.css size: 82
	debug: node-ff-assets-css readFile: www_static/css/panel.css size: 545
	debug: node-ff-assets-css readFile: www_static/css/style.css size: 10419
	debug: node-ff-assets-css target size: 298318
	info: node-ff-assets-css build result size: 1 from: 5
	info: node-ff-assets-css build done in: 33 ms.
	info: node-ff-assets-js build begin for: /static/js/lib/assets.js
	debug: node-ff-assets-js downloadFile: http://code.jquery.com/jquery-2.1.3.js
	debug: node-ff-assets-js downloadFile: https://code.angularjs.org/1.4.0-beta.4/angular.js
	debug: node-ff-assets-js downloadFile: https://code.angularjs.org/1.4.0-beta.4/angular-route.js
	debug: node-ff-assets-js downloadFile: https://code.angularjs.org/1.4.0-beta.4/angular-resource.js
	debug: node-ff-assets-js downloadFile: https://code.angularjs.org/1.4.0-beta.4/angular-touch.js
	debug: node-ff-assets-js downloadFile: http://localhost:8008/ui/include/js/controller/test1
	GET /ui/include/js/controller/test1 200 7.931 ms - -
	debug: node-ff-assets-js downloadFile: http://localhost:8008/ui/include/js/controller/test2
	GET /ui/include/js/controller/test2 200 5.215 ms - -
	debug: node-ff-assets-js downloadFile: http://localhost:8008/ui/include/js/controller/test3
	GET /ui/include/js/controller/test3 200 1.583 ms - -
	debug: node-ff-assets-js readFile: www_static/js/lib/jquery-2.1.3/jquery.js size: 247387
	debug: node-ff-assets-js readFile: node_modules/bootstrap/dist/js/bootstrap.js size: 66732
	debug: node-ff-assets-js readFile: node_modules/flot/jquery.flot.js size: 110008
	debug: node-ff-assets-js readFile: node_modules/flot/jquery.flot.resize.js size: 2504
	debug: node-ff-assets-js readFile: node_modules/flot/jquery.flot.pie.js size: 23405
	debug: node-ff-assets-js readFile: www_static/js/lib/angularjs-1.4.0-b4/angular.js size: 988198
	debug: node-ff-assets-js readFile: www_static/js/lib/angularjs-1.4.0-b4/angular-route.js size: 35796
	debug: node-ff-assets-js readFile: www_static/js/lib/angularjs-1.4.0-b4/angular-resource.js size: 26780
	debug: node-ff-assets-js readFile: www_static/js/lib/angularjs-1.4.0-b4/angular-touch.js size: 22887
	debug: node-ff-assets-js readFile: www_static/js/app-directives.js size: 185
	debug: node-ff-assets-js readFile: www_static/js/app-filters.js size: 202
	debug: node-ff-assets-js readFile: www_static/js/app-services.js size: 80
	debug: node-ff-assets-js readFile: www_static/js/app.js size: 766
	debug: node-ff-assets-js readFile: www_static/js/controller/page-about.js size: 364
	debug: node-ff-assets-js readFile: www_static/js/controller/page-foobar.js size: 361
	debug: node-ff-assets-js readFile: www_static/js/controller/page-index.js size: 351
	debug: node-ff-assets-js readFile: www_static/js/controller/page-help.js size: 376
	debug: node-ff-assets-js readFile: www_static/js/lib/xcrud/test1.js size: 2010
	debug: node-ff-assets-js readFile: www_static/js/lib/xcrud/test2.js size: 2138
	debug: node-ff-assets-js readFile: www_static/js/lib/xcrud/test3.js size: 2218
	debug: node-ff-assets-js target size: 1540945
	info: node-ff-assets-js build result size: 1 from: 24
	info: node-ff-assets-js build done in: 3497 ms.
	info: Server init done.
	
	// Result Next runs
	info: node-ff-assets-css build begin for: /static/css/lib/assets.css
	debug: node-ff-assets-css readFile: node_modules/bootstrap/dist/css/bootstrap.css size: 285496
	debug: node-ff-assets-css readFile: www_static/css/boot.css size: 1606
	debug: node-ff-assets-css readFile: www_static/css/flot.css size: 82
	debug: node-ff-assets-css readFile: www_static/css/panel.css size: 545
	debug: node-ff-assets-css readFile: www_static/css/style.css size: 10419
	debug: node-ff-assets-css target size: 298318
	info: node-ff-assets-css build result size: 1 from: 5
	info: node-ff-assets-css build done in: 36 ms.
	info: node-ff-assets-js build begin for: /static/js/lib/assets.js
	debug: node-ff-assets-js downloadFile: http://localhost:8008/ui/include/js/controller/test1
	GET /ui/include/js/controller/test1 200 7.931 ms - -
	debug: node-ff-assets-js downloadFile: http://localhost:8008/ui/include/js/controller/test2
	GET /ui/include/js/controller/test2 200 5.215 ms - -
	debug: node-ff-assets-js downloadFile: http://localhost:8008/ui/include/js/controller/test3
	GET /ui/include/js/controller/test3 200 1.583 ms - -
	debug: node-ff-assets-js readFile: www_static/js/lib/jquery-2.1.3/jquery.js size: 247387
	debug: node-ff-assets-js readFile: node_modules/bootstrap/dist/js/bootstrap.js size: 66732
	debug: node-ff-assets-js readFile: node_modules/flot/jquery.flot.js size: 110008
	debug: node-ff-assets-js readFile: node_modules/flot/jquery.flot.resize.js size: 2504
	debug: node-ff-assets-js readFile: node_modules/flot/jquery.flot.pie.js size: 23405
	debug: node-ff-assets-js readFile: www_static/js/lib/angularjs-1.4.0-b4/angular.js size: 988198
	debug: node-ff-assets-js readFile: www_static/js/lib/angularjs-1.4.0-b4/angular-route.js size: 35796
	debug: node-ff-assets-js readFile: www_static/js/lib/angularjs-1.4.0-b4/angular-resource.js size: 26780
	debug: node-ff-assets-js readFile: www_static/js/lib/angularjs-1.4.0-b4/angular-touch.js size: 22887
	debug: node-ff-assets-js readFile: www_static/js/app-directives.js size: 185
	debug: node-ff-assets-js readFile: www_static/js/app-filters.js size: 202
	debug: node-ff-assets-js readFile: www_static/js/app-services.js size: 80
	debug: node-ff-assets-js readFile: www_static/js/app.js size: 766
	debug: node-ff-assets-js readFile: www_static/js/controller/page-about.js size: 364
	debug: node-ff-assets-js readFile: www_static/js/controller/page-foobar.js size: 361
	debug: node-ff-assets-js readFile: www_static/js/controller/page-index.js size: 351
	debug: node-ff-assets-js readFile: www_static/js/controller/page-help.js size: 376
	debug: node-ff-assets-js readFile: www_static/js/lib/xcrud/test1.js size: 2010
	debug: node-ff-assets-js readFile: www_static/js/lib/xcrud/test2.js size: 2138
	debug: node-ff-assets-js readFile: www_static/js/lib/xcrud/test3.js size: 2218
	debug: node-ff-assets-js target size: 1540945
	info: node-ff-assets-js build result size: 1 from: 24
	info: node-ff-assets-js build done in: 105 ms.
	info: Server init done.

## Tests

  npm test

## Contributing

In lieu of a formal styleguide, take care to maintain the existing coding style.
Add unit tests for any new or changed functionality. Lint and test your code.

## Release History

### 0.2.1
* Added example application
* Fixed buid callback
* Fixed buildOrder default
* Updated doc

### 0.2.0
* Redone objs
* Added tests
* Made jslint pass 

### 0.1.x
* Added objectAdd
* Doc updates
* Initial release