Add ability to set the priority through the todolist.

TodoList.py

@@ -285,6 +285,11 @@ class TodoList(object):
         todo.set_completed()
         self.dirty = True
 
+    def set_priority(self, p_number, p_priority):
+        todo = self.todo(p_number)
+        todo.set_priority(p_priority)
+        self.dirty = True
+
     def __str__(self):
         return '\n'.join(pretty_print(self._todos))
 

test/TodoListTest.py

@@ -145,6 +145,12 @@ class TodoListTester(unittest.TestCase):
     def test_todo_complete(self):
         self.todolist.set_todo_completed(1)
         self.assertTrue(self.todolist.todo(1).is_completed())
+        self.assertTrue(self.todolist.is_dirty())
+
+    def test_todo_priority(self):
+        self.todolist.set_priority(1, 'F')
+        self.assertEquals(self.todolist.todo(1).priority(), 'F')
+        self.assertTrue(self.todolist.is_dirty())
 
 class TodoListDependencyTester(unittest.TestCase):
     def setUp(self):