Merge pull request #194 from QTSdev/master

Add a filter for JShrinkFilter.

Adds a php based minifier for javascript files.

Lib/Filter/JShrinkFilter.php

@@ -0,0 +1,41 @@
+<?php
+App::uses('AssetFilter', 'AssetCompress.Lib');
+
+/**
+ * JShrink filter.
+ *
+ * Allows you to minify Javascript files through JShrink.  
+ * JShrink can be downloaded at https://github.com/tedivm/JShrink.
+ * You need to put Minifier.php in your vendors jshrink folder.
+ *
+ */
+class JShrinkFilter extends AssetFilter {
+
+/**
+ * Settings for JShrink minifier.
+ *
+ * @var array
+ */
+    protected $_settings = array(
+        'path' => 'jshrink/Minifier.php',
+        'flaggedComments' => true,
+    );
+
+/**
+ * Apply JShrink to $content.
+ *
+ * @param string $filename target filename
+ * @param string $content Content to filter.
+ * @throws Exception
+ * @return string
+ */
+    public function output($filename, $content) {
+        App::import('Vendor', 'Minifier', array('file' => $this->_settings['path']));
+        if (!class_exists('JShrink\Minifier')) {
+            throw new Exception(sprintf('Cannot not load filter class "%s".', 'JShrink\Minifier'));
+        }
+        return JShrink\Minifier::minify($content, array('flaggedComments' => $this->_settings['flaggedComments']));
+    }
+
+}
+