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filters: Move TaskFilter into separate module
[etc/taskwarrior.git] / tasklib / filters.py
1 from tasklib.serializing import SerializingObject
2
3
4 class TaskFilter(SerializingObject):
5     """
6     A set of parameters to filter the task list with.
7     """
8
9     def __init__(self, warrior, filter_params=None):
10         self.filter_params = filter_params or []
11         super(TaskFilter, self).__init__(warrior)
12
13     def add_filter(self, filter_str):
14         self.filter_params.append(filter_str)
15
16     def add_filter_param(self, key, value):
17         key = key.replace('__', '.')
18
19         # Replace the value with empty string, since that is the
20         # convention in TW for empty values
21         attribute_key = key.split('.')[0]
22
23         # Since this is user input, we need to normalize before we serialize
24         value = self._normalize(attribute_key, value)
25         value = self._serialize(attribute_key, value)
26
27         # If we are filtering by uuid:, do not use uuid keyword
28         # due to TW-1452 bug
29         if key == 'uuid':
30             self.filter_params.insert(0, value)
31         else:
32             # Surround value with aphostrophes unless it's a empty string
33             value = "'%s'" % value if value else ''
34
35             # We enforce equality match by using 'is' (or 'none') modifier
36             # Without using this syntax, filter fails due to TW-1479
37             # which is, however, fixed in 2.4.5
38             if self.warrior.version < VERSION_2_4_5:
39                 modifier = '.is' if value else '.none'
40                 key = key + modifier if '.' not in key else key
41
42             self.filter_params.append(six.u("{0}:{1}").format(key, value))
43
44     def get_filter_params(self):
45         return [f for f in self.filter_params if f]
46
47     def clone(self):
48         c = self.__class__(self.warrior)
49         c.filter_params = list(self.filter_params)
50         return c