Add negation operator.

test/FilterTest.py

@@ -333,3 +333,12 @@ class OrdinalTagFilterTest(unittest.TestCase):
         self.assertEquals(len(result), 2)
         self.assertEquals(str(result[0]), "Foo due:%s" % self.today)
         self.assertEquals(str(result[1]), "Bar due:%s" % self.tomorrow)
+
+    def test_filter5(self):
+        otf = Filter.OrdinalTagFilter('due:!today')
+
+        result = otf.filter(self.todos)
+
+        self.assertEquals(len(result), 1)
+        self.assertEquals(str(result[0]), "Bar due:%s" % self.tomorrow)
+

topydo/lib/Filter.py

@@ -148,7 +148,7 @@ class LimitFilter(Filter):
     def filter(self, p_todos):
         return p_todos[:self.limit] if self.limit >= 0 else p_todos
 
-ORDINAL_TAG_MATCH = r"(?P<key>[^:]*):(?P<operator><=?|=|>=?)?(?P<value>\S*)"
+ORDINAL_TAG_MATCH = r"(?P<key>[^:]*):(?P<operator><=?|=|>=?|!)?(?P<value>\S*)"
 
 class OrdinalTagFilter(Filter):
     def __init__(self, p_expression):
@@ -188,5 +188,7 @@ class OrdinalTagFilter(Filter):
             return operand1 >= operand2
         elif self.operator == '>':
             return operand1 > operand2
+        elif self.operator == '!':
+            return operand1 != operand2
 
         return False