When new priority is the same, don't print it has changed.

test/PriorityCommandTest.py

@@ -51,6 +51,13 @@ class PriorityCommandTest(CommandTest.CommandTest):
         self.assertEquals(self.output, "Priority changed from A to B\n(B) Foo\n")
         self.assertEquals(self.errors, "")
 
+    def test_set_prio4(self):
+        command = PriorityCommand.PriorityCommand(["1", "A"], self.todolist, self.out, self.error)
+        command.execute()
+
+        self.assertFalse(self.todolist.is_dirty())
+        self.assertEquals(self.output, "(A) Foo\n")
+        self.assertEquals(self.errors, "")
 
     def test_invalid1(self):
         command = PriorityCommand.PriorityCommand(["99", "A"], self.todolist, self.out, self.error)

topydo/lib/PriorityCommand.py

@@ -41,9 +41,9 @@ class PriorityCommand(Command):
                 old_priority = todo.priority()
                 self.todolist.set_priority(todo, priority)
 
-                if old_priority and priority:
+                if old_priority and priority and old_priority != priority:
                     self.out("Priority changed from %s to %s" % (old_priority, priority))
-                else:
+                elif not old_priority:
                     self.out("Priority set to %s." % priority)
 
                 self.out(pretty_print(todo))