added option to set priority for to-do item:

	! - low priority
	!! - medium priority
	!!! - high priority

more than 3 exclamation marks are parsed as high priority
it simply adds class name to <span class="todotext">...

style.css

@@ -7,3 +7,7 @@ span.todouser { font-size: x-small; cursor:default; font-style: italic; padding-
 span.tododates { font-size: x-small; padding-left: 3px; padding-right: 3px; margin-right: 4px;  }
 span.todostarted { background:#EEA; font-weight: bold; }
 span.tododue { background:#EAA; font-weight: bold; }
+
+span.todolow { background-color: #ffc; }
+span.todomedium { background-color: #fd3; font-weight: bold; }
+span.todohigh { background-color: #ffbcaf; font-weight: bold; font-size:1.1em; }

syntax/todo.php

@@ -194,6 +194,7 @@ protected function parseTodoArgs($todoargs) {
         unset($data['completeddate']);
         $data['showdate'] = $this->getConf("ShowdateTag");
         $data['username'] = $this->getConf("Username");
+        $data['priority'] = 0;
         $options = explode(' ', $todoargs);
         foreach($options as $option) {
             $option = trim($option);
@@ -210,6 +211,13 @@ protected function parseTodoArgs($todoargs) {
                     $data['completeddate'] = new DateTime($completeddate);
                 }
             }
+            elseif($option[0] == '!') {
+                $plen = strlen($option);
+                $excl_count = substr_count($option, "!");
+                if (($plen == $excl_count) && ($excl_count >= 0)) {
+                    $data['priority'] = $excl_count;
+                }
+            }
             else {
                 @list($key, $value) = explode(':', $option, 2);
                 switch($key) {
@@ -301,7 +309,16 @@ protected function createTodoItem($renderer, $id, $data) {
             $return .= ']</span>';
         }
 
-        $spanclass = 'todotext';
+        // priority
+        $priorityclass = ''; 
+        if (isset($data['priority'])) {
+            $priority = $data['priority'];
+            if ($priority == 1) $priorityclass = ' todolow';
+            else if ($priority == 2) $priorityclass = ' todomedium';
+            else if ($priority >= 3) $priorityclass = ' todohigh';
+        }
+
+        $spanclass = 'todotext' . $priorityclass;
         if($this->getConf("CheckboxText") && !$this->getConf("AllowLinks") && $oldID == $ID && $data['checkbox']) {
             $spanclass .= ' clickabletodo todohlght';
         }