X-Git-Url: https://git.madduck.net/etc/taskwarrior.git/blobdiff_plain/1e2987ad784dbb5145fc4de35018c2cdb6cc6cd5..bee8b11c89922132fde1fab7a297856518caabd5:/tasklib/task.py?ds=sidebyside diff --git a/tasklib/task.py b/tasklib/task.py index 64c13ac..c821fcc 100644 --- a/tasklib/task.py +++ b/tasklib/task.py @@ -1,37 +1,81 @@ from __future__ import print_function import copy import datetime +import importlib import json import logging import os import six -import subprocess +import sys + +from .serializing import SerializingObject 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 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 TaskResource(object): +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 - self._original_data = data.copy() + # are not propagated. + self._original_data = copy.deepcopy(self._data) + + 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())) + + # 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 = copy.deepcopy(self._data) + def __getitem__(self, key): # This is a workaround to make TaskResource non-iterable @@ -42,22 +86,18 @@ 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__()) @@ -68,19 +108,48 @@ 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'] - def __init__(self, task, data={}): + def __init__(self, task, data=None): 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 '' + self._load_data(data or dict()) + super(TaskAnnotation, self).__init__(task.backend) def remove(self): self.task.remove_annotation(self) @@ -88,11 +157,16 @@ 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__ class Task(TaskResource): - read_only_fields = ['id', 'entry', 'urgency', 'uuid'] + read_only_fields = ['id', 'entry', 'urgency', 'uuid', 'modified'] class DoesNotExist(Exception): pass @@ -109,6 +183,18 @@ 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 @@ -116,20 +202,66 @@ class Task(TaskResource): """ pass - def __init__(self, warrior, data={}, **kwargs): - self.warrior = warrior + @classmethod + def from_input(cls, input_file=sys.stdin, modify=None, backend=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 backend is None: + backends = importlib.import_module('.backends') + hook_parent_dir = os.path.dirname(os.path.dirname(sys.argv[0])) + backend = backends.TaskWarrior(data_location=hook_parent_dir) + + # TaskWarrior instance is set to None + task = cls(backend) + + # 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, backend, **kwargs): + super(Task, self).__init__(backend) + + # 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) - # We keep data for backwards compatibility - # TODO: Should we keep this using unserialized access to _data dict? - self._data.update(data) + # Provide read only access to the original data + self.original = ReadOnlyDictView(self._original_data) def __unicode__(self): return self['description'] @@ -151,12 +283,6 @@ class Task(TaskResource): # If the tasks are not saved, return hash of instance id return id(self).__hash__() - @property - def _modified_fields(self): - for key in self._data.keys(): - if self._data.get(key) != self._original_data.get(key): - yield key - @property def completed(self): return self['status'] == six.text_type('completed') @@ -173,83 +299,71 @@ 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) + return super(Task, self).serialize_depends(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) + def delete(self): + if not self.saved: + raise Task.NotSaved("Task needs to be saved before it can be deleted") - def format_depends(self): - # We need to generate added and removed dependencies list, - # since Taskwarrior does not accept redefining dependencies. + # Refresh the status, and raise exception if the task is deleted + self.refresh(only_fields=['status']) - # 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 + if self.deleted: + raise Task.DeletedTask("Task was already deleted") + + self.backend.delete_task(self) - old_dependencies_raw = self._original_data.get('depends','') - old_dependencies = self.deserialize_depends(old_dependencies_raw) + # Refresh the status again, so that we have updated info stored + self.refresh(only_fields=['status', 'start', 'end']) - added = self['depends'] - old_dependencies - removed = old_dependencies - self['depends'] + def start(self): + if not self.saved: + raise Task.NotSaved("Task needs to be saved before it can be started") - # Removed dependencies need to be prefixed with '-' - return ','.join( - [t['uuid'] for t in added] + - ['-' + t['uuid'] for t in removed] - ) + # Refresh, and raise exception if task is already completed/deleted + self.refresh(only_fields=['status']) - def deserialize_annotations(self, data): - return [TaskAnnotation(self, d) for d in data] if data else [] + 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") - def deserialize_tags(self, tags): - if isinstance(tags, basestring): - return tags.split(',') if tags else [] - return tags + self.backend.start_task(self) - def serialize_tags(self, tags): - return ','.join(tags) if tags else '' + # Refresh the status again, so that we have updated info stored + self.refresh(only_fields=['status', 'start']) - def delete(self): + def stop(self): if not self.saved: - raise Task.NotSaved("Task needs to be saved before it can be deleted") + raise Task.NotSaved("Task needs to be saved before it can be stopped") - # Refresh the status, and raise exception if the task is deleted + # Refresh, and raise exception if task is already completed/deleted self.refresh(only_fields=['status']) - if self.deleted: - raise Task.DeletedTask("Task was already deleted") + if not self.active: + raise Task.InactiveTask("Cannot stop an inactive task") - self.warrior.execute_command([self['uuid'], 'delete'], config_override={ - 'confirmation': 'no', - }) + self.backend.stop_task(self) # Refresh the status again, so that we have updated info stored - self.refresh(only_fields=['status']) - + self.refresh(only_fields=['status', 'start']) def done(self): if not self.saved: @@ -263,148 +377,64 @@ class Task(TaskResource): elif self.deleted: raise Task.DeletedTask("Deleted task cannot be completed") - self.warrior.execute_command([self['uuid'], 'done']) + self.backend.complete_task(self) # 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): - args = [self['uuid'], 'modify'] if self.saved else ['add'] - args.extend(self._get_modified_fields_as_args()) - output = self.warrior.execute_command(args) + if self.saved and not self.modified: + return - # 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() + # All the actual work is done by the backend + self.backend.save_task(self) 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.backend.annotate_task(self, annotation) self.refresh(only_fields=['annotations']) 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'] - 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): - # 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 and field == 'description': - args.append(self._data[field]) - elif field == 'depends': - args.append('{0}:{1}'.format(field, self.format_depends())) - else: - # Use empty string to substitute for None value - args.append('{0}:{1}'.format(field, self._data[field] or '')) - - # 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 + self.backend.denotate_task(self, annotation) + self.refresh(only_fields=['annotations']) - def refresh(self, only_fields=[]): + def refresh(self, only_fields=None, after_save=False): # 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]) + new_data = self.backend.refresh_task(self, after_save=after_save) + if only_fields: to_update = dict( [(k, new_data.get(k)) for k in only_fields]) - self._data.update(to_update) - self._original_data.update(to_update) + self._update_data(to_update, update_original=True) else: - self._data = new_data - # We need to create a clone for original_data though - # Shallow copy is alright, since data dict uses only - # primitive data types - self._original_data = new_data.copy() - - -class TaskFilter(object): - """ - 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 - value = value if value is not None else '' - - # 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)) - - 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 - + self._load_data(new_data) class TaskQuerySet(object): """ Represents a lazy lookup for a task objects. """ - def __init__(self, warrior=None, filter_obj=None): - self.warrior = warrior + def __init__(self, backend, filter_obj=None): + self.backend = backend self._result_cache = None - self.filter_obj = filter_obj or TaskFilter() + self.filter_obj = filter_obj or self.backend.filter_class(backend) def __deepcopy__(self, memo): """ Deep copy of a QuerySet doesn't populate the cache """ - obj = self.__class__() + obj = self.__class__(backend=self.backend) for k, v in self.__dict__.items(): if k in ('_iter', '_result_cache'): obj.__dict__[k] = None @@ -449,7 +479,7 @@ class TaskQuerySet(object): if klass is None: klass = self.__class__ filter_obj = self.filter_obj.clone() - c = klass(warrior=self.warrior, filter_obj=filter_obj) + c = klass(backend=self.backend, filter_obj=filter_obj) c.__dict__.update(kwargs) return c @@ -457,7 +487,7 @@ class TaskQuerySet(object): """ Fetch the tasks which match the current filters. """ - return self.warrior.filter_tasks(self.filter_obj) + return self.backend.filter_tasks(self.filter_obj) def all(self): """ @@ -498,70 +528,3 @@ class TaskQuerySet(object): 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): - 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), - } - 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 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: - if stderr.strip(): - error_msg = stderr.strip().splitlines()[-1] - else: - error_msg = stdout.strip() - raise TaskWarriorException(error_msg) - return stdout.strip().split('\n') - - def filter_tasks(self, filter_obj): - args = ['export', '--'] + filter_obj.get_filter_params() - tasks = [] - for line in self.execute_command(args): - if line: - data = line.strip(',') - try: - tasks.append(Task(self, json.loads(data))) - except ValueError: - raise TaskWarriorException('Invalid JSON: %s' % data) - return tasks - - 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'], config_override={ - 'confirmation': 'no', - })