backends: Add logger to backends module

[etc/taskwarrior.git] / tasklib / backends.py

diff --git a/tasklib/backends.py b/tasklib/backends.py
index 51285b544b8e31fd148b3f1ce3ff133f085fa6cd..1eb83b75407467c982d9a3a5465c8d160e1dd949 100644 (file)
--- a/tasklib/backends.py
+++ b/tasklib/backends.py
@@ -1,10 +1,17 @@
 import abc
 import abc

+import datetime

 import json
 import json

+import logging

 import os
 import re
 import os
 import re

+import six

 import subprocess
 
 import subprocess
 

-from tasklib.filters import TaskWarriorFilter
+from .task import Task, TaskQuerySet
+from .filters import TaskWarriorFilter
+from .serializing import local_zone
+
+DATE_FORMAT_CALC = '%Y-%m-%dT%H:%M:%S'

 
 VERSION_2_1_0 = six.u('2.1.0')
 VERSION_2_2_0 = six.u('2.2.0')
 
 VERSION_2_1_0 = six.u('2.1.0')
 VERSION_2_2_0 = six.u('2.2.0')


@@ -16,10 +23,14 @@ VERSION_2_4_3 = six.u('2.4.3')
 VERSION_2_4_4 = six.u('2.4.4')
 VERSION_2_4_5 = six.u('2.4.5')
 
 VERSION_2_4_4 = six.u('2.4.4')
 VERSION_2_4_5 = six.u('2.4.5')
 

+logger = logging.getLogger(__name__)

 
 class Backend(object):
 
 
 class Backend(object):
 

-    filter_class = TaskWarriorFilter
+    @abc.abstractproperty
+    def filter_class(self):
+        """Returns the TaskFilter class used by this backend"""
+        pass

 
     @abc.abstractmethod
     def filter_tasks(self, filter_obj):
 
     @abc.abstractmethod
     def filter_tasks(self, filter_obj):


@@ -67,6 +78,13 @@ class Backend(object):
         """Syncs the backend database with the taskd server"""
         pass
 
         """Syncs the backend database with the taskd server"""
         pass
 

+    def convert_datetime_string(self, value):
+        """
+        Converts TW syntax datetime string to a localized datetime
+        object. This method is not mandatory.
+        """
+        raise NotImplemented
+

 
 class TaskWarriorException(Exception):
     pass
 
 class TaskWarriorException(Exception):
     pass


@@ -184,6 +202,23 @@ class TaskWarrior(object):
         else:
             return six.u("description:'{0}'").format(task._data['description'] or '')
 
         else:
             return six.u("description:'{0}'").format(task._data['description'] or '')
 

+    def convert_datetime_string(self, value):
+
+        if self.version >= VERSION_2_4_0:
+            # For strings, use 'task calc' to evaluate the string to datetime
+            # available since TW 2.4.0
+            args = value.split()
+            result = self.execute_command(['calc'] + args)
+            naive = datetime.datetime.strptime(result[0], DATE_FORMAT_CALC)
+            localized = local_zone.localize(naive)
+        else:
+            raise ValueError("Provided value could not be converted to "
+                             "datetime, its type is not supported: {}"
+                             .format(type(value)))
+
+    @property
+    def filter_class(self):
+        return TaskWarriorFilter

 
     # Public interface
 
 
     # Public interface