+ def _get_modified_task_fields_as_args(self, task):
+ args = []
+
+ def add_field(field):
+ # Add the output of format_field method to args list (defaults to
+ # field:value)
+ serialized_value = task._serialize(field, task._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 task: six.u("{0}:{1}").format(
+ field, escaped_serialized_value)
+
+ format_func = getattr(self, 'format_{0}'.format(field),
+ format_default)
+
+ args.append(format_func(task))
+
+ # If we're modifying saved task, simply pass on all modified fields
+ if task.saved:
+ for field in task._modified_fields:
+ add_field(field)
+
+ # For new tasks, pass all fields that make sense
+ else:
+ for field in task._data.keys():
+ # We cannot set stuff that's read only (ID, UUID, ..)
+ if field in task.read_only_fields:
+ continue
+ # We do not want to do field deletion for new tasks
+ if task._data[field] is None:
+ continue
+ # Otherwise we're fine
+ add_field(field)
+
+ return args
+
+ def format_depends(self, task):
+ # We need to generate added and removed dependencies list,
+ # since Taskwarrior does not accept redefining dependencies.
+
+ # This cannot be part of serialize_depends, since we need
+ # to keep a list of all depedencies in the _data dictionary,
+ # not just currently added/removed ones
+
+ old_dependencies = task._original_data.get('depends', set())
+
+ added = task['depends'] - old_dependencies
+ removed = old_dependencies - task['depends']
+
+ # Removed dependencies need to be prefixed with '-'
+ return 'depends:' + ','.join(
+ [t['uuid'] for t in added] +
+ ['-' + t['uuid'] for t in removed]
+ )
+
+ def format_description(self, task):
+ # Task version older than 2.4.0 ignores first word of the
+ # task description if description: prefix is used
+ if self.version < self.VERSION_2_4_0:
+ return task._data['description']
+ else:
+ return six.u("description:'{0}'").format(
+ task._data['description'] or '',
+ )
+
+ def convert_datetime_string(self, value):
+
+ if self.version >= self.VERSION_2_4_0:
+ # For strings, use '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)),