Index: mod/quiz/lib.php
===================================================================
RCS file: /home/cvs_repositories/globalcvs/ou-moodle/mod/quiz/lib.php,v
retrieving revision 1.28
diff -u -r1.28 lib.php
--- mod/quiz/lib.php	21 May 2008 11:48:40 -0000	1.28
+++ mod/quiz/lib.php	3 Jun 2008 16:34:46 -0000
@@ -1211,4 +1211,13 @@
     }
     return '';
 }
+
+function quiz_supports($feature) {
+    switch($feature) {
+        case FEATURE_GRADE_HAS_GRADE: return true;
+        case FEATURE_COMPLETION_TRACKS_VIEWS: return true;
+        default: return false;
+    }
+}
+
 ?>
Index: lib/moodlelib.php
===================================================================
RCS file: /home/cvs_repositories/globalcvs/ou-moodle/lib/moodlelib.php,v
retrieving revision 1.126
diff -u -r1.126 moodlelib.php
--- lib/moodlelib.php	23 May 2008 15:04:38 -0000	1.126
+++ lib/moodlelib.php	3 Jun 2008 16:34:46 -0000
@@ -6413,6 +6413,48 @@
     return $plugins;
 }
 
+// Feature constants
+/** True if module can provide a grade */
+define('FEATURE_GRADE_HAS_GRADE','grade_has_grade');
+/** True if module has code to track whether somebody viewed it */
+define('FEATURE_COMPLETION_TRACKS_VIEWS','completion_tracks_views');
+/** True if module has custom completion rules */
+define('FEATURE_COMPLETION_HAS_RULES','completion_has_rules');
+
+/**
+ * Checks whether a plugin supports a specified feature.
+ *
+ * @param string $type Plugin type e.g. 'mod'
+ * @param string $name Plugin name
+ * @param string $feature Feature code (FEATURE_xx constant)
+ * @return Feature result (false if not supported, usually true but may have
+ *   other feature-specific value otherwise)
+ */
+function plugin_supports($type,$name,$feature) {
+    global $CFG;
+    switch($type) {
+        case 'mod' :
+            $file=$CFG->dirroot.'/mod/'.$name.'/lib.php';
+            $function=$name.'_supports';
+            break;
+        default:
+            throw new Exception('Unsupported plugin type ('.$type.')');
+    }
+    
+    // Load library and look for function
+    require_once($file);
+    if(function_exists($function)) {
+        // Function exists, so just return function result
+        return $function($feature);                
+    } else {
+        switch($feature) {
+            // If some features can also be checked in other ways
+            // for legacy support, this could be added here
+            default: return false;
+        }
+    }           
+}
+
 /**
  * Returns true if the current version of PHP is greater that the specified one.
  *