[FEATURE] Add hook to pagerenderer after compress/concatenate

Implement a hook to be able to influence the concatenated
and compressed resource files before they get wrapped in tags.

Resolves: #33234
Releases: 4.6, 4.7

Change-Id: I0f1a1337ab5b3fbe50692c7f342ecaccc282d052
Reviewed-on: http://review.typo3.org/7822
Reviewed-by: Susanne Moog
Tested-by: Susanne Moog
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer
Reviewed-by: Steffen Ritter
Tested-by: Steffen Ritter

t3lib/class.t3lib_pagerenderer.php

@@ -1510,7 +1510,24 @@ class t3lib_PageRenderer implements t3lib_Singleton {
 				// do the file compression
 			$this->doCompress();
 		}
-
+			// postTransform for possible manuipulation of concatenated and compressed files
+		if(is_array($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_pagerenderer.php']['render-postTransform'])) {
+			  $params = array(
+				  'jsLibs' => &$this->jsLibs,
+				  'jsFooterLibs'   => &$this->jsFooterLibs,
+				  'jsFiles' => &$this->jsFiles,
+				  'jsFooterFiles' => &$this->jsFooterFiles,
+				  'cssFiles' => &$this->cssFiles,
+				  'headerData' => &$this->headerData,
+				  'footerData' => &$this->footerData,
+				  'jsInline' => &$this->jsInline,
+				  'jsFooterInline' => &$this->jsFooterInline,
+				  'cssInline' => &$this->cssInline,
+			  );
+			foreach ($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_pagerenderer.php']['render-postTransform'] as $hook) {
+				t3lib_div::callUserFunction($hook, $params, $this);
+			}
+		 }
 		$metaTags = implode(LF, $this->metaTags);
 
 			// remove ending slashes from static header block