1 files changed, 32 insertions, 22 deletions

diff --git a/inc/parserutils.php b/inc/parserutils.php
index 4df273f11..06bd6dbb8 100644
--- a/inc/parserutils.php
+++ b/inc/parserutils.php
@@ -430,8 +430,9 @@ function p_render_metadata($id, $orig){
     global $ID, $METADATA_RENDERERS;
 
     // avoid recursive rendering processes for the same id
-    if (isset($METADATA_RENDERERS[$id]))
+    if (isset($METADATA_RENDERERS[$id])) {
         return $orig;
+    }
 
     // store the original metadata in the global $METADATA_RENDERERS so p_set_metadata can use it
     $METADATA_RENDERERS[$id] =& $orig;
@@ -444,8 +445,6 @@ function p_render_metadata($id, $orig){
     $evt = new Doku_Event('PARSER_METADATA_RENDER', $orig);
     if ($evt->advise_before()) {
 
-        require_once DOKU_INC."inc/parser/metadata.php";
-
         // get instructions
         $instructions = p_cached_instructions(wikiFN($id),false,$id);
         if(is_null($instructions)){
@@ -588,7 +587,7 @@ function p_sort_modes($a, $b){
 function p_render($mode,$instructions,&$info){
     if(is_null($instructions)) return '';
 
-    $Renderer =& p_get_renderer($mode);
+    $Renderer = p_get_renderer($mode);
     if (is_null($Renderer)) return null;
 
     $Renderer->reset();
@@ -616,43 +615,54 @@ function p_render($mode,$instructions,&$info){
 }
 
 /**
+ * Figure out the correct renderer class to use for $mode,
+ * instantiate and return it
+ *
  * @param $mode string Mode of the renderer to get
  * @return null|Doku_Renderer The renderer
+ *
+ * @author Christopher Smith <chris@jalakai.co.uk>
  */
-function & p_get_renderer($mode) {
+function p_get_renderer($mode) {
     /** @var Doku_Plugin_Controller $plugin_controller */
     global $conf, $plugin_controller;
 
     $rname = !empty($conf['renderer_'.$mode]) ? $conf['renderer_'.$mode] : $mode;
     $rclass = "Doku_Renderer_$rname";
 
+    // if requested earlier or a bundled renderer
     if( class_exists($rclass) ) {
         $Renderer = new $rclass();
         return $Renderer;
     }
 
-    // try default renderer first:
-    $file = DOKU_INC."inc/parser/$rname.php";
-    if(@file_exists($file)){
-        require_once $file;
+    // not bundled, see if its an enabled plugin for rendering $mode
+    $Renderer = $plugin_controller->load('renderer',$rname);
+    if ($Renderer && is_a($Renderer, 'Doku_Renderer')  && ($mode == $Renderer->getFormat())) {
+        return $Renderer;
+    }
 
-        if ( !class_exists($rclass) ) {
-            trigger_error("Unable to resolve render class $rclass",E_USER_WARNING);
-            msg("Renderer '$rname' for $mode not valid",-1);
-            return null;
+    // there is a configuration error!
+    // not bundled, not a valid enabled plugin, use $mode to try to fallback to a bundled renderer
+    $rclass = "Doku_Renderer_$mode";
+    if ( class_exists($rclass) ) {
+        // viewers should see renderered output, so restrict the warning to admins only
+        $msg = "No renderer '$rname' found for mode '$mode', check your plugins";
+        if ($mode == 'xhtml') {
+            $msg .= " and the 'renderer_xhtml' config setting";
         }
-        $Renderer = new $rclass();
-    }else{
-        // Maybe a plugin/component is available?
-        $Renderer = $plugin_controller->load('renderer',$rname);
+        $msg .= ".<br/>Attempting to fallback to the bundled renderer.";
+        msg($msg,-1,'','',MSG_ADMINS_ONLY);
 
-        if(!isset($Renderer) || is_null($Renderer)){
-            msg("No renderer '$rname' found for mode '$mode'",-1);
-            return null;
-        }
+        $Renderer = new $rclass;
+        $Renderer->nocache();     // fallback only (and may include admin alerts), don't cache
+        return $Renderer;
     }
 
-    return $Renderer;
+    // fallback failed, alert the world
+    trigger_error("Unable to resolve render class $rclass",E_USER_WARNING);
+    msg("No renderer '$rname' found for mode '$mode'",-1);
+    return null;
 }
 
 /**