Make it possible to pass a start= argument to enum()

qutebrowser/test/utils/usertypes/test_enum.py

@@ -56,6 +56,12 @@ class EnumTests(TestCase):
         with self.assertRaises(KeyError):
             _ = self.enum['two']
 
+    def test_start(self):
+        """Test the start= argument."""
+        e = enum('three', 'four', start=3)
+        self.assertEqual(e.three, 3)
+        self.assertEqual(e.four, 4)
+
 
 if __name__ == '__main__':
     unittest.main()

qutebrowser/utils/usertypes.py

@@ -32,7 +32,7 @@ from qutebrowser.utils.log import misc as logger
 _UNSET = object()
 
 
-def enum(*items, **named):
+def enum(*items, start=0):
     """Factory for simple enumerations.
 
     We really don't need more complex things here, so we don't use python3.4's
@@ -42,9 +42,10 @@ def enum(*items, **named):
 
     Args:
         *items: Items to be sequentally enumerated.
-        **named: Items to have a given position/number.
+        start: The number to use for the first value.
     """
-    enums = dict(zip(items, range(len(items))), **named)
+    numbers = range(start, len(items) + start)
+    enums = dict(zip(items, numbers))
     return EnumBase('Enum', (), enums)