import abc import datetime import json import logging import os import re import six import subprocess from .task import Task, TaskQuerySet from .filters import TaskWarriorFilter from .serializing import local_zone DATE_FORMAT_CALC = '%Y-%m-%dT%H:%M:%S' logger = logging.getLogger(__name__) class Backend(object): @abc.abstractproperty def filter_class(self): """Returns the TaskFilter class used by this backend""" pass @abc.abstractmethod def filter_tasks(self, filter_obj): """Returns a list of Task objects matching the given filter""" pass @abc.abstractmethod def save_task(self, task): pass @abc.abstractmethod def delete_task(self, task): pass @abc.abstractmethod def start_task(self, task): pass @abc.abstractmethod def stop_task(self, task): pass @abc.abstractmethod def complete_task(self, task): pass @abc.abstractmethod def refresh_task(self, task, after_save=False): """ Refreshes the given task. Returns new data dict with serialized attributes. """ pass @abc.abstractmethod def annotate_task(self, task, annotation): pass @abc.abstractmethod def denotate_task(self, task, annotation): pass @abc.abstractmethod def sync(self): """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 TaskWarrior(object): 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') VERSION_2_4_4 = six.u('2.4.4') VERSION_2_4_5 = six.u('2.4.5') 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 = { '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 >= self.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) def _get_command_args(self, args, config_override=None): command_args = ['task', 'rc:{0}'.format(self.taskrc_location)] config = self.config.copy() config.update(config_override or dict()) for item in config.items(): command_args.append('rc.{0}={1}'.format(*item)) command_args.extend(map(six.text_type, args)) return command_args def _get_version(self): p = subprocess.Popen( ['task', '--version'], stdout=subprocess.PIPE, stderr=subprocess.PIPE) stdout, stderr = [x.decode('utf-8') for x in p.communicate()] return stdout.strip('\n') 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(): if field in task.read_only_fields: continue 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 '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))) return localized @property def filter_class(self): return TaskWarriorFilter # Public interface def get_config(self): raw_output = self.execute_command( ['show'], config_override={'verbose': 'nothing'} ) config = dict() config_regex = re.compile(r'^(?P[^\s]+)\s+(?P[^\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=None, 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 and allow_failure: if stderr.strip(): error_msg = stderr.strip() else: error_msg = stdout.strip() raise TaskWarriorException(error_msg) # 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 < self.VERSION_2_4_2: self.execute_command(['next'], allow_failure=False) def merge_with(self, path, push=False): path = path.rstrip('/') + '/' self.execute_command(['merge', path], config_override={ 'merge.autopush': 'yes' if push else 'no', }) def undo(self): self.execute_command(['undo']) # Backend interface implementation def filter_tasks(self, filter_obj): self.enforce_recurrence() args = ['export', '--'] + filter_obj.get_filter_params() tasks = [] for line in self.execute_command(args): if line: data = line.strip(',') try: filtered_task = Task(self) filtered_task._load_data(json.loads(data)) tasks.append(filtered_task) except ValueError: raise TaskWarriorException('Invalid JSON: %s' % data) return tasks def save_task(self, task): """Save a task into TaskWarrior database using add/modify call""" args = [task['uuid'], 'modify'] if task.saved else ['add'] args.extend(self._get_modified_task_fields_as_args(task)) output = self.execute_command(args) # Parse out the new ID, if the task is being added for the first time if not task.saved: id_lines = [l for l in output if l.startswith('Created task ')] # Complain loudly if it seems that more tasks were created # Should not happen if len(id_lines) != 1 or len(id_lines[0].split(' ')) != 3: raise TaskWarriorException("Unexpected output when creating " "task: %s" % '\n'.join(id_lines)) # Circumvent the ID storage, since ID is considered read-only identifier = id_lines[0].split(' ')[2].rstrip('.') # Identifier can be either ID or UUID for completed tasks try: task._data['id'] = int(identifier) except ValueError: task._data['uuid'] = identifier # 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 task.refresh(after_save=True) def delete_task(self, task): self.execute_command([task['uuid'], 'delete']) def start_task(self, task): self.execute_command([task['uuid'], 'start']) def stop_task(self, task): self.execute_command([task['uuid'], 'stop']) def complete_task(self, task): # Older versions of TW do not stop active task at completion if self.version < self.VERSION_2_4_0 and task.active: task.stop() self.execute_command([task['uuid'], 'done']) def annotate_task(self, task, annotation): args = [task['uuid'], 'annotate', annotation] self.execute_command(args) def denotate_task(self, task, annotation): args = [task['uuid'], 'denotate', annotation] self.execute_command(args) def refresh_task(self, task, after_save=False): # We need to use ID as backup for uuid here for the refreshes # of newly saved tasks. Any other place in the code is fine # with using UUID only. args = [task['uuid'] or task['id'], 'export'] output = self.execute_command(args) def valid(output): return len(output) == 1 and output[0].startswith('{') # For older TW versions attempt to uniquely locate the task # using the data we have if it has been just saved. # This can happen when adding a completed task on older TW versions. if (not valid(output) and self.version < self.VERSION_2_4_5 and after_save): # Make a copy, removing ID and UUID. It's most likely invalid # (ID 0) if it failed to match a unique task. data = copy.deepcopy(task._data) data.pop('id', None) data.pop('uuid', None) taskfilter = self.filter_class(self) for key, value in data.items(): taskfilter.add_filter_param(key, value) output = self.execute_command(['export', '--'] + taskfilter.get_filter_params()) # If more than 1 task has been matched still, raise an exception if not valid(output): raise TaskWarriorException( "Unique identifiers {0} with description: {1} matches " "multiple tasks: {2}".format( task['uuid'] or task['id'], task['description'], output) ) return json.loads(output[0]) def sync(self): self.execute_command(['sync'])