X-Git-Url: https://git.madduck.net/etc/taskwarrior.git/blobdiff_plain/0ea1b0d359dc80d2bef66971b523a26515e90fee..1c7620f16af735f074cc9903e15e38260f1faf4e:/tasklib/task.py

diff --git a/tasklib/task.py b/tasklib/task.py
index f7afbf2..708c9c7 100644
--- a/tasklib/task.py
+++ b/tasklib/task.py
@@ -4,10 +4,15 @@ import datetime
 import json
 import logging
 import os
+import pytz
+import re
 import six
+import sys
 import subprocess
+import tzlocal
 
 DATE_FORMAT = '%Y%m%dT%H%M%SZ'
+DATE_FORMAT_CALC = '%Y-%m-%dT%H:%M:%S'
 REPR_OUTPUT_SIZE = 10
 PENDING = 'pending'
 COMPLETED = 'completed'
@@ -16,35 +21,300 @@ VERSION_2_1_0 = six.u('2.1.0')
 VERSION_2_2_0 = six.u('2.2.0')
 VERSION_2_3_0 = six.u('2.3.0')
 VERSION_2_4_0 = six.u('2.4.0')
+VERSION_2_4_1 = six.u('2.4.1')
+VERSION_2_4_2 = six.u('2.4.2')
+VERSION_2_4_3 = six.u('2.4.3')
 
 logger = logging.getLogger(__name__)
+local_zone = tzlocal.get_localzone()
 
 
 class TaskWarriorException(Exception):
     pass
 
 
-class TaskResource(object):
+class ReadOnlyDictView(object):
+    """
+    Provides simplified read-only view upon dict object.
+    """
+
+    def __init__(self, viewed_dict):
+        self.viewed_dict = viewed_dict
+
+    def __getitem__(self, key):
+        return copy.deepcopy(self.viewed_dict.__getitem__(key))
+
+    def __contains__(self, k):
+        return self.viewed_dict.__contains__(k)
+
+    def __iter__(self):
+        for value in self.viewed_dict:
+            yield copy.deepcopy(value)
+
+    def __len__(self):
+        return len(self.viewed_dict)
+
+    def get(self, key, default=None):
+        return copy.deepcopy(self.viewed_dict.get(key, default))
+
+    def items(self):
+        return [copy.deepcopy(v) for v in self.viewed_dict.items()]
+
+    def values(self):
+        return [copy.deepcopy(v) for v in self.viewed_dict.values()]
+
+
+class SerializingObject(object):
+    """
+    Common ancestor for TaskResource & TaskFilter, since they both
+    need to serialize arguments.
+
+    Serializing method should hold the following contract:
+      - any empty value (meaning removal of the attribute)
+        is deserialized into a empty string
+      - None denotes a empty value for any attribute
+
+    Deserializing method should hold the following contract:
+      - None denotes a empty value for any attribute (however,
+        this is here as a safeguard, TaskWarrior currently does
+        not export empty-valued attributes) if the attribute
+        is not iterable (e.g. list or set), in which case
+        a empty iterable should be used.
+
+    Normalizing methods should hold the following contract:
+      - They are used to validate and normalize the user input.
+        Any attribute value that comes from the user (during Task
+        initialization, assignign values to Task attributes, or
+        filtering by user-provided values of attributes) is first
+        validated and normalized using the normalize_{key} method.
+      - If validation or normalization fails, normalizer is expected
+        to raise ValueError.
+    """
+
+    def __init__(self, warrior):
+        self.warrior = warrior
+
+    def _deserialize(self, key, value):
+        hydrate_func = getattr(self, 'deserialize_{0}'.format(key),
+                               lambda x: x if x != '' else None)
+        return hydrate_func(value)
+
+    def _serialize(self, key, value):
+        dehydrate_func = getattr(self, 'serialize_{0}'.format(key),
+                                 lambda x: x if x is not None else '')
+        return dehydrate_func(value)
+
+    def _normalize(self, key, value):
+        """
+        Use normalize_<key> methods to normalize user input. Any user
+        input will be normalized at the moment it is used as filter,
+        or entered as a value of Task attribute.
+        """
+
+        # None value should not be converted by normalizer
+        if value is None:
+            return None
+
+        normalize_func = getattr(self, 'normalize_{0}'.format(key),
+                                 lambda x: x)
+
+        return normalize_func(value)
+
+    def timestamp_serializer(self, date):
+        if not date:
+            return ''
+
+        # Any serialized timestamp should be localized, we need to
+        # convert to UTC before converting to string (DATE_FORMAT uses UTC)
+        date = date.astimezone(pytz.utc)
+
+        return date.strftime(DATE_FORMAT)
+
+    def timestamp_deserializer(self, date_str):
+        if not date_str:
+            return None
+
+        # Return timestamp localized in the local zone
+        naive_timestamp = datetime.datetime.strptime(date_str, DATE_FORMAT)
+        localized_timestamp = pytz.utc.localize(naive_timestamp)
+        return localized_timestamp.astimezone(local_zone)
+
+    def serialize_entry(self, value):
+        return self.timestamp_serializer(value)
+
+    def deserialize_entry(self, value):
+        return self.timestamp_deserializer(value)
+
+    def normalize_entry(self, value):
+        return self.datetime_normalizer(value)
+
+    def serialize_modified(self, value):
+        return self.timestamp_serializer(value)
+
+    def deserialize_modified(self, value):
+        return self.timestamp_deserializer(value)
+
+    def normalize_modified(self, value):
+        return self.datetime_normalizer(value)
+
+    def serialize_start(self, value):
+        return self.timestamp_serializer(value)
+
+    def deserialize_start(self, value):
+        return self.timestamp_deserializer(value)
+
+    def normalize_start(self, value):
+        return self.datetime_normalizer(value)
+
+    def serialize_end(self, value):
+        return self.timestamp_serializer(value)
+
+    def deserialize_end(self, value):
+        return self.timestamp_deserializer(value)
+
+    def normalize_end(self, value):
+        return self.datetime_normalizer(value)
+
+    def serialize_due(self, value):
+        return self.timestamp_serializer(value)
+
+    def deserialize_due(self, value):
+        return self.timestamp_deserializer(value)
+
+    def normalize_due(self, value):
+        return self.datetime_normalizer(value)
+
+    def serialize_scheduled(self, value):
+        return self.timestamp_serializer(value)
+
+    def deserialize_scheduled(self, value):
+        return self.timestamp_deserializer(value)
+
+    def normalize_scheduled(self, value):
+        return self.datetime_normalizer(value)
+
+    def serialize_until(self, value):
+        return self.timestamp_serializer(value)
+
+    def deserialize_until(self, value):
+        return self.timestamp_deserializer(value)
+
+    def normalize_until(self, value):
+        return self.datetime_normalizer(value)
+
+    def serialize_wait(self, value):
+        return self.timestamp_serializer(value)
+
+    def deserialize_wait(self, value):
+        return self.timestamp_deserializer(value)
+
+    def normalize_wait(self, value):
+        return self.datetime_normalizer(value)
+
+    def serialize_annotations(self, value):
+        value = value if value is not None else []
+
+        # This may seem weird, but it's correct, we want to export
+        # a list of dicts as serialized value
+        serialized_annotations = [json.loads(annotation.export_data())
+                                  for annotation in value]
+        return serialized_annotations if serialized_annotations else ''
+
+    def deserialize_annotations(self, data):
+        return [TaskAnnotation(self, d) for d in data] if data else []
+
+    def serialize_tags(self, tags):
+        return ','.join(tags) if tags else ''
+
+    def deserialize_tags(self, tags):
+        if isinstance(tags, six.string_types):
+            return tags.split(',') if tags else []
+        return tags or []
+
+    def serialize_depends(self, value):
+        # Return the list of uuids
+        value = value if value is not None else set()
+        return ','.join(task['uuid'] for task in value)
+
+    def deserialize_depends(self, raw_uuids):
+        raw_uuids = raw_uuids or ''  # Convert None to empty string
+        uuids = raw_uuids.split(',')
+        return set(self.warrior.tasks.get(uuid=uuid) for uuid in uuids if uuid)
+
+    def datetime_normalizer(self, value):
+        """
+        Normalizes date/datetime value (considered to come from user input)
+        to localized datetime value. Following conversions happen:
+
+        naive date -> localized datetime with the same date, and time=midnight
+        naive datetime -> localized datetime with the same value
+        localized datetime -> localized datetime (no conversion)
+        """
+
+        if (isinstance(value, datetime.date)
+            and not isinstance(value, datetime.datetime)):
+            # Convert to local midnight
+            value_full = datetime.datetime.combine(value, datetime.time.min)
+            localized = local_zone.localize(value_full)
+        elif isinstance(value, datetime.datetime):
+            if value.tzinfo is None:
+                # Convert to localized datetime object
+                localized = local_zone.localize(value)
+            else:
+                # If the value is already localized, there is no need to change
+                # time zone at this point. Also None is a valid value too.
+                localized = value
+        elif (isinstance(value, six.string_types)
+                and self.warrior.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.warrior.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)))
+
+        return localized
+
+    def normalize_uuid(self, value):
+        # Enforce sane UUID
+        if not isinstance(value, six.string_types) or value == '':
+            raise ValueError("UUID must be a valid non-empty string, "
+                             "not: {}".format(value))
+
+        return value
+
+
+class TaskResource(SerializingObject):
     read_only_fields = []
 
     def _load_data(self, data):
-        self._data = data
+        self._data = dict((key, self._deserialize(key, value))
+                          for key, value in data.items())
         # We need to use a copy for original data, so that changes
-        # are not propagated. Shallow copy is alright, since data dict uses only
-        # primitive data types
-        self._original_data = data.copy()
+        # are not propagated.
+        self._original_data = copy.deepcopy(self._data)
 
-    def _update_data(self, data, update_original=False):
+    def _update_data(self, data, update_original=False, remove_missing=False):
         """
         Low level update of the internal _data dict. Data which are coming as
         updates should already be serialized. If update_original is True, the
         original_data dict is updated as well.
         """
+        self._data.update(dict((key, self._deserialize(key, value))
+                               for key, value in data.items()))
 
-        self._data.update(data)
+        # In certain situations, we want to treat missing keys as removals
+        if remove_missing:
+            for key in set(self._data.keys()) - set(data.keys()):
+                self._data[key] = None
 
         if update_original:
-            self._original_data.update(data)
+            self._original_data = copy.deepcopy(self._data)
+
 
     def __getitem__(self, key):
         # This is a workaround to make TaskResource non-iterable
@@ -55,22 +325,18 @@ class TaskResource(object):
         except ValueError:
             pass
 
-        return self._deserialize(key, self._data.get(key))
+        if key not in self._data:
+            self._data[key] = self._deserialize(key, None)
+
+        return self._data.get(key)
 
     def __setitem__(self, key, value):
         if key in self.read_only_fields:
             raise RuntimeError('Field \'%s\' is read-only' % key)
-        self._data[key] = self._serialize(key, value)
 
-    def _deserialize(self, key, value):
-        hydrate_func = getattr(self, 'deserialize_{0}'.format(key),
-                               lambda x: x)
-        return hydrate_func(value)
-
-    def _serialize(self, key, value):
-        dehydrate_func = getattr(self, 'serialize_{0}'.format(key),
-                                 lambda x: x)
-        return dehydrate_func(value)
+        # Normalize the user input before saving it
+        value = self._normalize(key, value)
+        self._data[key] = value
 
     def __str__(self):
         s = six.text_type(self.__unicode__())
@@ -81,6 +347,40 @@ class TaskResource(object):
     def __repr__(self):
         return str(self)
 
+    def export_data(self):
+        """
+        Exports current data contained in the Task as JSON
+        """
+
+        # We need to remove spaces for TW-1504, use custom separators
+        data_tuples = ((key, self._serialize(key, value))
+                       for key, value in six.iteritems(self._data))
+
+        # Empty string denotes empty serialized value, we do not want
+        # to pass that to TaskWarrior.
+        data_tuples = filter(lambda t: t[1] is not '', data_tuples)
+        data = dict(data_tuples)
+        return json.dumps(data, separators=(',',':'))
+
+    @property
+    def _modified_fields(self):
+        writable_fields = set(self._data.keys()) - set(self.read_only_fields)
+        for key in writable_fields:
+            new_value = self._data.get(key)
+            old_value = self._original_data.get(key)
+
+            # Make sure not to mark data removal as modified field if the
+            # field originally had some empty value
+            if key in self._data and not new_value and not old_value:
+                continue
+
+            if new_value != old_value:
+                yield key
+
+    @property
+    def modified(self):
+        return bool(list(self._modified_fields))
+
 
 class TaskAnnotation(TaskResource):
     read_only_fields = ['entry', 'description']
@@ -88,12 +388,7 @@ class TaskAnnotation(TaskResource):
     def __init__(self, task, data={}):
         self.task = task
         self._load_data(data)
-
-    def deserialize_entry(self, data):
-        return datetime.datetime.strptime(data, DATE_FORMAT) if data else None
-
-    def serialize_entry(self, date):
-        return date.strftime(DATE_FORMAT) if date else ''
+        super(TaskAnnotation, self).__init__(task.warrior)
 
     def remove(self):
         self.task.remove_annotation(self)
@@ -101,6 +396,11 @@ class TaskAnnotation(TaskResource):
     def __unicode__(self):
         return self['description']
 
+    def __eq__(self, other):
+        # consider 2 annotations equal if they belong to the same task, and
+        # their data dics are the same
+        return self.task == other.task and self._data == other._data
+
     __repr__ = __unicode__
 
 
@@ -122,6 +422,18 @@ class Task(TaskResource):
         """
         pass
 
+    class ActiveTask(Exception):
+        """
+        Raised when the operation cannot be performed on the active task.
+        """
+        pass
+
+    class InactiveTask(Exception):
+        """
+        Raised when the operation cannot be performed on an inactive task.
+        """
+        pass
+
     class NotSaved(Exception):
         """
         Raised when the operation cannot be performed on the task, because
@@ -129,16 +441,65 @@ class Task(TaskResource):
         """
         pass
 
+    @classmethod
+    def from_input(cls, input_file=sys.stdin, modify=None, warrior=None):
+        """
+        Creates a Task object, directly from the stdin, by reading one line.
+        If modify=True, two lines are used, first line interpreted as the
+        original state of the Task object, and second line as its new,
+        modified value. This is consistent with the TaskWarrior's hook
+        system.
+
+        Object created by this method should not be saved, deleted
+        or refreshed, as t could create a infinite loop. For this
+        reason, TaskWarrior instance is set to None.
+
+        Input_file argument can be used to specify the input file,
+        but defaults to sys.stdin.
+        """
+
+        # Detect the hook type if not given directly
+        name = os.path.basename(sys.argv[0])
+        modify = name.startswith('on-modify') if modify is None else modify
+
+        # Create the TaskWarrior instance if none passed
+        if warrior is None:
+            hook_parent_dir = os.path.dirname(os.path.dirname(sys.argv[0]))
+            warrior = TaskWarrior(data_location=hook_parent_dir)
+
+        # TaskWarrior instance is set to None
+        task = cls(warrior)
+
+        # Load the data from the input
+        task._load_data(json.loads(input_file.readline().strip()))
+
+        # If this is a on-modify event, we are provided with additional
+        # line of input, which provides updated data
+        if modify:
+            task._update_data(json.loads(input_file.readline().strip()),
+                              remove_missing=True)
+
+        return task
+
     def __init__(self, warrior, **kwargs):
-        self.warrior = warrior
+        super(Task, self).__init__(warrior)
+
+        # Check that user is not able to set read-only value in __init__
+        for key in kwargs.keys():
+            if key in self.read_only_fields:
+                raise RuntimeError('Field \'%s\' is read-only' % key)
 
         # We serialize the data in kwargs so that users of the library
         # do not have to pass different data formats via __setitem__ and
         # __init__ methods, that would be confusing
 
         # Rather unfortunate syntax due to python2.6 comaptiblity
-        self._load_data(dict((key, self._serialize(key, value))
-                        for (key, value) in six.iteritems(kwargs)))
+        self._data = dict((key, self._normalize(key, value))
+                          for (key, value) in six.iteritems(kwargs))
+        self._original_data = copy.deepcopy(self._data)
+
+        # Provide read only access to the original data
+        self.original = ReadOnlyDictView(self._original_data)
 
     def __unicode__(self):
         return self['description']
@@ -160,13 +521,6 @@ class Task(TaskResource):
             # If the tasks are not saved, return hash of instance id
             return id(self).__hash__()
 
-    @property
-    def _modified_fields(self):
-        writable_fields = set(self._data.keys()) - set(self.read_only_fields)
-        for key in writable_fields:
-            if self._data.get(key) != self._original_data.get(key):
-                yield key
-
     @property
     def completed(self):
         return self['status'] == six.text_type('completed')
@@ -183,34 +537,22 @@ class Task(TaskResource):
     def pending(self):
         return self['status'] == six.text_type('pending')
 
+    @property
+    def active(self):
+        return self['start'] is not None
+
     @property
     def saved(self):
         return self['uuid'] is not None or self['id'] is not None
 
-    def serialize_due(self, date):
-        if not date:
-            return None
-        return date.strftime(DATE_FORMAT)
-
-    def deserialize_due(self, date_str):
-        if not date_str:
-            return None
-        return datetime.datetime.strptime(date_str, DATE_FORMAT)
-
     def serialize_depends(self, cur_dependencies):
         # Check that all the tasks are saved
-        for task in cur_dependencies:
+        for task in (cur_dependencies or set()):
             if not task.saved:
                 raise Task.NotSaved('Task \'%s\' needs to be saved before '
                                     'it can be set as dependency.' % task)
 
-        # Return the list of uuids
-        return ','.join(task['uuid'] for task in cur_dependencies)
-
-    def deserialize_depends(self, raw_uuids):
-        raw_uuids = raw_uuids or ''  # Convert None to empty string
-        uuids = raw_uuids.split(',')
-        return set(self.warrior.tasks.get(uuid=uuid) for uuid in uuids if uuid)
+        return super(Task, self).serialize_depends(cur_dependencies)
 
     def format_depends(self):
         # We need to generate added and removed dependencies list,
@@ -220,8 +562,7 @@ class Task(TaskResource):
         # to keep a list of all depedencies in the _data dictionary,
         # not just currently added/removed ones
 
-        old_dependencies_raw = self._original_data.get('depends','')
-        old_dependencies = self.deserialize_depends(old_dependencies_raw)
+        old_dependencies = self._original_data.get('depends', set())
 
         added = self['depends'] - old_dependencies
         removed = old_dependencies - self['depends']
@@ -232,24 +573,13 @@ class Task(TaskResource):
                 ['-' + t['uuid'] for t in removed]
             )
 
-    def deserialize_annotations(self, data):
-        return [TaskAnnotation(self, d) for d in data] if data else []
-
-    def deserialize_tags(self, tags):
-        if isinstance(tags, basestring):
-            return tags.split(',') if tags else []
-        return tags
-
-    def serialize_tags(self, tags):
-        return ','.join(tags) if tags else ''
-
     def format_description(self):
         # Task version older than 2.4.0 ignores first word of the
         # task description if description: prefix is used
         if self.warrior.version < VERSION_2_4_0:
             return self._data['description']
         else:
-            return "description:'{0}'".format(self._data['description'] or '')
+            return six.u("description:'{0}'").format(self._data['description'] or '')
 
     def delete(self):
         if not self.saved:
@@ -264,8 +594,41 @@ class Task(TaskResource):
         self.warrior.execute_command([self['uuid'], 'delete'])
 
         # Refresh the status again, so that we have updated info stored
+        self.refresh(only_fields=['status', 'start', 'end'])
+
+    def start(self):
+        if not self.saved:
+            raise Task.NotSaved("Task needs to be saved before it can be started")
+
+        # Refresh, and raise exception if task is already completed/deleted
+        self.refresh(only_fields=['status'])
+
+        if self.completed:
+            raise Task.CompletedTask("Cannot start a completed task")
+        elif self.deleted:
+            raise Task.DeletedTask("Deleted task cannot be started")
+        elif self.active:
+            raise Task.ActiveTask("Task is already active")
+
+        self.warrior.execute_command([self['uuid'], 'start'])
+
+        # Refresh the status again, so that we have updated info stored
+        self.refresh(only_fields=['status', 'start'])
+
+    def stop(self):
+        if not self.saved:
+            raise Task.NotSaved("Task needs to be saved before it can be stopped")
+
+        # Refresh, and raise exception if task is already completed/deleted
         self.refresh(only_fields=['status'])
 
+        if not self.active:
+            raise Task.InactiveTask("Cannot stop an inactive task")
+
+        self.warrior.execute_command([self['uuid'], 'stop'])
+
+        # Refresh the status again, so that we have updated info stored
+        self.refresh(only_fields=['status', 'start'])
 
     def done(self):
         if not self.saved:
@@ -279,12 +642,19 @@ class Task(TaskResource):
         elif self.deleted:
             raise Task.DeletedTask("Deleted task cannot be completed")
 
+        # Older versions of TW do not stop active task at completion
+        if self.warrior.version < VERSION_2_4_0 and self.active:
+            self.stop()
+
         self.warrior.execute_command([self['uuid'], 'done'])
 
         # Refresh the status again, so that we have updated info stored
-        self.refresh(only_fields=['status'])
+        self.refresh(only_fields=['status', 'start', 'end'])
 
     def save(self):
+        if self.saved and not self.modified:
+            return
+
         args = [self['uuid'], 'modify'] if self.saved else ['add']
         args.extend(self._get_modified_fields_as_args())
         output = self.warrior.execute_command(args)
@@ -302,6 +672,9 @@ class Task(TaskResource):
             # Circumvent the ID storage, since ID is considered read-only
             self._data['id'] = int(id_lines[0].split(' ')[2].rstrip('.'))
 
+        # Refreshing is very important here, as not only modification time
+        # is updated, but arbitrary attribute may have changed due hooks
+        # altering the data before saving
         self.refresh()
 
     def add_annotation(self, annotation):
@@ -314,7 +687,7 @@ class Task(TaskResource):
 
     def remove_annotation(self, annotation):
         if not self.saved:
-            raise Task.NotSaved("Task needs to be saved to add annotation")
+            raise Task.NotSaved("Task needs to be saved to remove annotation")
 
         if isinstance(annotation, TaskAnnotation):
             annotation = annotation['description']
@@ -328,9 +701,21 @@ class Task(TaskResource):
         def add_field(field):
             # Add the output of format_field method to args list (defaults to
             # field:value)
-            format_default = lambda k: "{0}:'{1}'".format(k, self._data[k] or '')
+            serialized_value = self._serialize(field, self._data[field])
+
+            # Empty values should not be enclosed in quotation marks, see
+            # TW-1510
+            if serialized_value is '':
+                escaped_serialized_value = ''
+            else:
+                escaped_serialized_value = six.u("'{0}'").format(serialized_value)
+
+            format_default = lambda: six.u("{0}:{1}").format(field,
+                                                      escaped_serialized_value)
+
             format_func = getattr(self, 'format_{0}'.format(field),
-                                  lambda: format_default(field))
+                                  format_default)
+
             args.append(format_func())
 
         # If we're modifying saved task, simply pass on all modified fields
@@ -363,14 +748,14 @@ class Task(TaskResource):
         else:
             self._load_data(new_data)
 
-
-class TaskFilter(object):
+class TaskFilter(SerializingObject):
     """
     A set of parameters to filter the task list with.
     """
 
-    def __init__(self, filter_params=[]):
+    def __init__(self, warrior, filter_params=[]):
         self.filter_params = filter_params
+        super(TaskFilter, self).__init__(warrior)
 
     def add_filter(self, filter_str):
         self.filter_params.append(filter_str)
@@ -380,20 +765,32 @@ class TaskFilter(object):
 
         # Replace the value with empty string, since that is the
         # convention in TW for empty values
-        value = value if value is not None else ''
+        attribute_key = key.split('.')[0]
+
+        # Since this is user input, we need to normalize before we serialize
+        value = self._normalize(attribute_key, value)
+        value = self._serialize(attribute_key, value)
 
         # If we are filtering by uuid:, do not use uuid keyword
         # due to TW-1452 bug
         if key == 'uuid':
             self.filter_params.insert(0, value)
         else:
-            self.filter_params.append('{0}:{1}'.format(key, value))
+            # Surround value with aphostrophes unless it's a empty string
+            value = "'%s'" % value if value else ''
+
+            # We enforce equality match by using 'is' (or 'none') modifier
+            # Without using this syntax, filter fails due to TW-1479
+            modifier = '.is' if value else '.none'
+            key = key + modifier if '.' not in key else key
+
+            self.filter_params.append(six.u("{0}:{1}").format(key, value))
 
     def get_filter_params(self):
         return [f for f in self.filter_params if f]
 
     def clone(self):
-        c = self.__class__()
+        c = self.__class__(self.warrior)
         c.filter_params = list(self.filter_params)
         return c
 
@@ -406,7 +803,7 @@ class TaskQuerySet(object):
     def __init__(self, warrior=None, filter_obj=None):
         self.warrior = warrior
         self._result_cache = None
-        self.filter_obj = filter_obj or TaskFilter()
+        self.filter_obj = filter_obj or TaskFilter(warrior)
 
     def __deepcopy__(self, memo):
         """
@@ -509,24 +906,44 @@ class TaskQuerySet(object):
 
 
 class TaskWarrior(object):
-    def __init__(self, data_location='~/.task', create=True):
-        data_location = os.path.expanduser(data_location)
-        if create and not os.path.exists(data_location):
-            os.makedirs(data_location)
+    def __init__(self, data_location=None, create=True, taskrc_location='~/.taskrc'):
+        self.taskrc_location = os.path.expanduser(taskrc_location)
+
+        # If taskrc does not exist, pass / to use defaults and avoid creating
+        # dummy .taskrc file by TaskWarrior
+        if not os.path.exists(self.taskrc_location):
+            self.taskrc_location = '/'
+
+        self.version = self._get_version()
         self.config = {
-            'data.location': os.path.expanduser(data_location),
             'confirmation': 'no',
+            'dependency.confirmation': 'no',  # See TW-1483 or taskrc man page
+            'recurrence.confirmation': 'no',  # Necessary for modifying R tasks
+
+            # Defaults to on since 2.4.5, we expect off during parsing
+            'json.array': 'off',
+
+            # 2.4.3 onwards supports 0 as infite bulk, otherwise set just
+            # arbitrary big number which is likely to be large enough
+            'bulk': 0 if self.version >= VERSION_2_4_3 else 100000,
         }
+
+        # Set data.location override if passed via kwarg
+        if data_location is not None:
+            data_location = os.path.expanduser(data_location)
+            if create and not os.path.exists(data_location):
+                os.makedirs(data_location)
+            self.config['data.location'] = data_location
+
         self.tasks = TaskQuerySet(self)
-        self.version = self._get_version()
 
     def _get_command_args(self, args, config_override={}):
-        command_args = ['task', 'rc:/']
+        command_args = ['task', 'rc:{0}'.format(self.taskrc_location)]
         config = self.config.copy()
         config.update(config_override)
         for item in config.items():
             command_args.append('rc.{0}={1}'.format(*item))
-        command_args.extend(map(str, args))
+        command_args.extend(map(six.text_type, args))
         return command_args
 
     def _get_version(self):
@@ -537,22 +954,55 @@ class TaskWarrior(object):
         stdout, stderr = [x.decode('utf-8') for x in p.communicate()]
         return stdout.strip('\n')
 
-    def execute_command(self, args, config_override={}):
+    def get_config(self):
+        raw_output = self.execute_command(
+                ['show'],
+                config_override={'verbose': 'nothing'}
+            )
+
+        config = dict()
+        config_regex = re.compile(r'^(?P<key>[^\s]+)\s+(?P<value>[^\s].+$)')
+
+        for line in raw_output:
+            match = config_regex.match(line)
+            if match:
+                config[match.group('key')] = match.group('value').strip()
+
+        return config
+
+    def execute_command(self, args, config_override={}, allow_failure=True,
+                        return_all=False):
         command_args = self._get_command_args(
             args, config_override=config_override)
         logger.debug(' '.join(command_args))
         p = subprocess.Popen(command_args, stdout=subprocess.PIPE,
                              stderr=subprocess.PIPE)
         stdout, stderr = [x.decode('utf-8') for x in p.communicate()]
-        if p.returncode:
+        if p.returncode and allow_failure:
             if stderr.strip():
-                error_msg = stderr.strip().splitlines()[-1]
+                error_msg = stderr.strip()
             else:
                 error_msg = stdout.strip()
             raise TaskWarriorException(error_msg)
-        return stdout.strip().split('\n')
+
+        # Return all whole triplet only if explicitly asked for
+        if not return_all:
+            return stdout.rstrip().split('\n')
+        else:
+            return (stdout.rstrip().split('\n'),
+                    stderr.rstrip().split('\n'),
+                    p.returncode)
+
+    def enforce_recurrence(self):
+        # Run arbitrary report command which will trigger generation
+        # of recurrent tasks.
+
+        # Only necessary for TW up to 2.4.1, fixed in 2.4.2.
+        if self.version < VERSION_2_4_2:
+            self.execute_command(['next'], allow_failure=False)
 
     def filter_tasks(self, filter_obj):
+        self.enforce_recurrence()
         args = ['export', '--'] + filter_obj.get_filter_params()
         tasks = []
         for line in self.execute_command(args):