--- locallib.old.php    2008-05-07 15:56:54.926899136 +0200
+++ locallib.php        2008-05-07 15:23:26.499226552 +0200
@@ -1832,4 +1832,30 @@
     return false;
 }
 
+/**
+ * Starts lesson (alters $USER object and inserts a record into lesson_time).
+ * If the lesson is timed, a time warning is set with lesson_set_message().
+ *
+ */
+function lesson_start_lesson(&$USER, $lesson, $context) {
+    if(!isset($USER->startlesson[$lesson->id]) && !has_capability('mod/lesson:manage', $context)) {
+        $USER->startlesson[$lesson->id] = true;
+        if (!get_field('lesson_timer', 'id', 'userid', $USER->id, 'lessonid', $lesson->id)) {
+            // add a record showing that the lesson has been started
+            $startlesson = new stdClass;
+            $startlesson->lessonid = $lesson->id;
+            $startlesson->userid = $USER->id;
+            $startlesson->starttime = time();
+            $startlesson->lessontime = time();
+            
+            if (!insert_record('lesson_timer', $startlesson)) {
+                error('Error: could not insert row into lesson_timer table');
+            }
+        }
+        if ($lesson->timed) {
+            lesson_set_message(get_string('maxtimewarning', 'lesson', $lesson->maxtime), 'center');
+        }
+    }
+}
+
 ?>