X-Git-Url: https://git.madduck.net/etc/taskwarrior.git/blobdiff_plain/e17985e0d4a7ce2eb83c580c71e2f7c1af7f093b..088fc620ec1921c3e9ee2dcf8385393b53306824:/tasklib/task.py diff --git a/tasklib/task.py b/tasklib/task.py index f74e0d2..6392b9e 100644 --- a/tasklib/task.py +++ b/tasklib/task.py @@ -1,103 +1,631 @@ +from __future__ import print_function +import copy +import datetime import json +import logging import os +import six import subprocess -import tempfile -import uuid - +DATE_FORMAT = '%Y%m%dT%H%M%SZ' +REPR_OUTPUT_SIZE = 10 PENDING = 'pending' +COMPLETED = 'completed' + +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') + +logger = logging.getLogger(__name__) class TaskWarriorException(Exception): pass -class Task(object): +class SerializingObject(object): + """ + Common ancestor for TaskResource & TaskFilter, since they both + need to serialize arguments. + """ - def __init__(self, warrior, data={}): - 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 timestamp_serializer(self, date): + if not date: + return None + return date.strftime(DATE_FORMAT) + + def timestamp_deserializer(self, date_str): + if not date_str: + return None + return datetime.datetime.strptime(date_str, DATE_FORMAT) + + def serialize_entry(self, value): + return self.timestamp_serializer(value) + + def deserialize_entry(self, value): + return self.timestamp_deserializer(value) + + def serialize_modified(self, value): + return self.timestamp_serializer(value) + + def deserialize_modified(self, value): + return self.timestamp_deserializer(value) + + def serialize_due(self, value): + return self.timestamp_serializer(value) + + def deserialize_due(self, value): + return self.timestamp_deserializer(value) + + def serialize_scheduled(self, value): + return self.timestamp_serializer(value) + + def deserialize_scheduled(self, value): + return self.timestamp_deserializer(value) + + def serialize_until(self, value): + return self.timestamp_serializer(value) + + def deserialize_until(self, value): + return self.timestamp_deserializer(value) + + def serialize_wait(self, value): + return self.timestamp_serializer(value) + + def deserialize_wait(self, value): + return self.timestamp_deserializer(value) + + 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, basestring): + return tags.split(',') if tags else [] + return tags + + def serialize_depends(self, cur_dependencies): + # 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) + + +class TaskResource(SerializingObject): + read_only_fields = [] + + def _load_data(self, data): self._data = data + # 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() + + def _update_data(self, data, update_original=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(data) + + if update_original: + self._original_data.update(data) def __getitem__(self, key): - return self._data.get(key) + # This is a workaround to make TaskResource non-iterable + # over simple index-based iteration + try: + int(key) + raise StopIteration + except ValueError: + pass + + return self._deserialize(key, 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 __setitem__(self, key, val): - self._data[key] = val + def __str__(self): + s = six.text_type(self.__unicode__()) + if not six.PY3: + s = s.encode('utf-8') + return s + + def __repr__(self): + return str(self) + + +class TaskAnnotation(TaskResource): + read_only_fields = ['entry', 'description'] + + def __init__(self, task, data={}): + self.task = task + self._load_data(data) + + def remove(self): + self.task.remove_annotation(self) def __unicode__(self): - return self._data.get('description') + return self['description'] + + __repr__ = __unicode__ + + +class Task(TaskResource): + read_only_fields = ['id', 'entry', 'urgency', 'uuid', 'modified'] + + class DoesNotExist(Exception): + pass + + class CompletedTask(Exception): + """ + Raised when the operation cannot be performed on the completed task. + """ + pass + + class DeletedTask(Exception): + """ + Raised when the operation cannot be performed on the deleted task. + """ + pass + + class NotSaved(Exception): + """ + Raised when the operation cannot be performed on the task, because + it has not been saved to TaskWarrior yet. + """ + pass + + def __init__(self, warrior, **kwargs): + self.warrior = 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))) + + def __unicode__(self): + return self['description'] + + def __eq__(self, other): + if self['uuid'] and other['uuid']: + # For saved Tasks, just define equality by equality of uuids + return self['uuid'] == other['uuid'] + else: + # If the tasks are not saved, compare the actual instances + return id(self) == id(other) + + + def __hash__(self): + if self['uuid']: + # For saved Tasks, just define equality by equality of uuids + return self['uuid'].__hash__() + else: + # 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') + + @property + def deleted(self): + return self['status'] == six.text_type('deleted') + + @property + def waiting(self): + return self['status'] == six.text_type('waiting') + + @property + def pending(self): + return self['status'] == six.text_type('pending') + + @property + def saved(self): + return self['uuid'] is not None or self['id'] is not None + + def serialize_depends(self, cur_dependencies): + # Check that all the tasks are saved + for task in cur_dependencies: + if not task.saved: + raise Task.NotSaved('Task \'%s\' needs to be saved before ' + 'it can be set as dependency.' % task) + + return super(Task, self).serialize_depends(cur_dependencies) - def regenerate_uuid(self): - self['uuid'] = str(uuid.uuid4()) + def format_depends(self): + # 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_raw = self._original_data.get('depends','') + old_dependencies = self.deserialize_depends(old_dependencies_raw) + + added = self['depends'] - old_dependencies + removed = old_dependencies - self['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 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 '') def delete(self): - self.warrior.delete_task(self['uuid']) + if not self.saved: + raise Task.NotSaved("Task needs to be saved before it can be deleted") + + # Refresh the status, and raise exception if the task is deleted + self.refresh(only_fields=['status']) + + if self.deleted: + raise Task.DeletedTask("Task was already deleted") + + self.warrior.execute_command([self['uuid'], 'delete']) + + # Refresh the status again, so that we have updated info stored + self.refresh(only_fields=['status']) + def done(self): - self.warrior.complete_task(self['uuid']) + if not self.saved: + raise Task.NotSaved("Task needs to be saved before it can be completed") - def save(self, delete_first=True): - if self['uuid'] and delete_first: - self.delete() - if not self['uuid'] or delete_first: - self.regenerate_uuid() - self.warrior.import_tasks([self._data]) + # Refresh, and raise exception if task is already completed/deleted + self.refresh(only_fields=['status']) - __repr__ = __unicode__ + if self.completed: + raise Task.CompletedTask("Cannot complete a completed task") + elif self.deleted: + raise Task.DeletedTask("Deleted task cannot be completed") + self.warrior.execute_command([self['uuid'], 'done']) -class TaskWarrior(object): + # Refresh the status again, so that we have updated info stored + self.refresh(only_fields=['status']) + + def save(self): + args = [self['uuid'], 'modify'] if self.saved else ['add'] + args.extend(self._get_modified_fields_as_args()) + output = self.warrior.execute_command(args) + + # Parse out the new ID, if the task is being added for the first time + if not self.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 + self._data['id'] = int(id_lines[0].split(' ')[2].rstrip('.')) + + self.refresh() + + def add_annotation(self, annotation): + if not self.saved: + raise Task.NotSaved("Task needs to be saved to add annotation") + + args = [self['uuid'], 'annotate', annotation] + self.warrior.execute_command(args) + self.refresh(only_fields=['annotations']) + + def remove_annotation(self, annotation): + if not self.saved: + raise Task.NotSaved("Task needs to be saved to remove annotation") + + if isinstance(annotation, TaskAnnotation): + annotation = annotation['description'] + args = [self['uuid'], 'denotate', annotation] + self.warrior.execute_command(args) + self.refresh(only_fields=['annotations']) + + def _get_modified_fields_as_args(self): + args = [] + + 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 '') + format_func = getattr(self, 'format_{0}'.format(field), + lambda: format_default(field)) + args.append(format_func()) + + # If we're modifying saved task, simply pass on all modified fields + if self.saved: + for field in self._modified_fields: + add_field(field) + # For new tasks, pass all fields that make sense + else: + for field in self._data.keys(): + if field in self.read_only_fields: + continue + add_field(field) + + return args + + def refresh(self, only_fields=[]): + # Raise error when trying to refresh a task that has not been saved + if not self.saved: + raise Task.NotSaved("Task needs to be saved to be refreshed") + + # 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 = [self['uuid'] or self['id'], 'export'] + new_data = json.loads(self.warrior.execute_command(args)[0]) + if only_fields: + to_update = dict( + [(k, new_data.get(k)) for k in only_fields]) + self._update_data(to_update, update_original=True) + else: + self._load_data(new_data) + + +class TaskFilter(SerializingObject): + """ + A set of parameters to filter the task list with. + """ + + def __init__(self, filter_params=[]): + self.filter_params = filter_params + + def add_filter(self, filter_str): + self.filter_params.append(filter_str) + + def add_filter_param(self, key, value): + key = key.replace('__', '.') + # Replace the value with empty string, since that is the + # convention in TW for empty values + attribute_key = key.split('.')[0] + 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: + # 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("{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.filter_params = list(self.filter_params) + return c + + +class TaskQuerySet(object): + """ + Represents a lazy lookup for a task objects. + """ + + def __init__(self, warrior=None, filter_obj=None): + self.warrior = warrior + self._result_cache = None + self.filter_obj = filter_obj or TaskFilter() + + def __deepcopy__(self, memo): + """ + Deep copy of a QuerySet doesn't populate the cache + """ + obj = self.__class__() + for k, v in self.__dict__.items(): + if k in ('_iter', '_result_cache'): + obj.__dict__[k] = None + else: + obj.__dict__[k] = copy.deepcopy(v, memo) + return obj + + def __repr__(self): + data = list(self[:REPR_OUTPUT_SIZE + 1]) + if len(data) > REPR_OUTPUT_SIZE: + data[-1] = "...(remaining elements truncated)..." + return repr(data) + + def __len__(self): + if self._result_cache is None: + self._result_cache = list(self) + return len(self._result_cache) + + def __iter__(self): + if self._result_cache is None: + self._result_cache = self._execute() + return iter(self._result_cache) + + def __getitem__(self, k): + if self._result_cache is None: + self._result_cache = list(self) + return self._result_cache.__getitem__(k) + + def __bool__(self): + if self._result_cache is not None: + return bool(self._result_cache) + try: + next(iter(self)) + except StopIteration: + return False + return True + + def __nonzero__(self): + return type(self).__bool__(self) + + def _clone(self, klass=None, **kwargs): + if klass is None: + klass = self.__class__ + filter_obj = self.filter_obj.clone() + c = klass(warrior=self.warrior, filter_obj=filter_obj) + c.__dict__.update(kwargs) + return c + + def _execute(self): + """ + Fetch the tasks which match the current filters. + """ + return self.warrior.filter_tasks(self.filter_obj) + + def all(self): + """ + Returns a new TaskQuerySet that is a copy of the current one. + """ + return self._clone() + + def pending(self): + return self.filter(status=PENDING) + + def completed(self): + return self.filter(status=COMPLETED) + + def filter(self, *args, **kwargs): + """ + Returns a new TaskQuerySet with the given filters added. + """ + clone = self._clone() + for f in args: + clone.filter_obj.add_filter(f) + for key, value in kwargs.items(): + clone.filter_obj.add_filter_param(key, value) + return clone + + def get(self, **kwargs): + """ + Performs the query and returns a single object matching the given + keyword arguments. + """ + clone = self.filter(**kwargs) + num = len(clone) + if num == 1: + return clone._result_cache[0] + if not num: + raise Task.DoesNotExist( + 'Task matching query does not exist. ' + 'Lookup parameters were {0}'.format(kwargs)) + raise ValueError( + 'get() returned more than one Task -- it returned {0}! ' + 'Lookup parameters were {1}'.format(num, kwargs)) + + +class TaskWarrior(object): def __init__(self, data_location='~/.task', create=True): - if not os.path.exists(data_location): + data_location = os.path.expanduser(data_location) + if create and not os.path.exists(data_location): os.makedirs(data_location) self.config = { 'data.location': os.path.expanduser(data_location), + 'confirmation': 'no', + 'dependency.confirmation': 'no', # See TW-1483 or taskrc man page } + self.tasks = TaskQuerySet(self) + self.version = self._get_version() + + def _get_command_args(self, args, config_override={}): + command_args = ['task', 'rc:/'] + 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)) + 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 _generate_command(self, command): - args = ['task', 'rc:/'] - for item in self.config.items(): - args.append('rc.{0}={1}'.format(*item)) - args.append(command) - return ' '.join(args) - - def _execute(self, command): - p = subprocess.Popen(self._generate_command(command), shell=True, - stdout=subprocess.PIPE, stderr=subprocess.PIPE) - stdout, stderr = p.communicate() + def execute_command(self, args, config_override={}): + 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: - raise TaskWarriorException(stderr.strip()) + if stderr.strip(): + error_msg = stderr.strip().splitlines()[-1] + else: + error_msg = stdout.strip() + raise TaskWarriorException(error_msg) return stdout.strip().split('\n') - def get_tasks(self, project=None, status=PENDING): - command = 'export status:{0}'.format(status) - if project is not None: - command += ' project:{0}'.format(project) + def filter_tasks(self, filter_obj): + args = ['export', '--'] + filter_obj.get_filter_params() tasks = [] - for line in self._execute(command): + for line in self.execute_command(args): if line: - tasks.append(Task(self, json.loads(line.strip(',')))) + 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 get_task(self, task_id): - command = '{0} export'.format(task_id) - return Task(self, json.loads(self._execute(command)[0])) - - def add_task(self, description, project=None): - args = ['add', description] - if project is not None: - args.append('project:{0}'.format(project)) - self._execute(' '.join(args)) - - def delete_task(self, task_id): - self._execute('{0} rc.confirmation:no delete'.format(task_id)) - - def complete_task(self, task_id): - self._execute('{0} done'.format(task_id)) + 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 import_tasks(self, tasks): - fd, path = tempfile.mkstemp() - with open(path, 'w') as f: - f.write(json.dumps(tasks)) - self._execute('import {0}'.format(path)) + def undo(self): + self.execute_command(['undo'])