tasklib/task.py

   1 from __future__ import print_function
   2 import copy
   3 import datetime
   4 import json
   5 import logging
   6 import os
   7 import six
   8 import subprocess
   9
  10 DATE_FORMAT = '%Y%m%dT%H%M%SZ'
  11 REPR_OUTPUT_SIZE = 10
  12 PENDING = 'pending'
  13 COMPLETED = 'completed'
  14
  15 logger = logging.getLogger(__name__)
  16
  17
  18 class TaskWarriorException(Exception):
  19     pass
  20
  21
  22 class TaskResource(object):
  23     read_only_fields = []
  24
  25     def _load_data(self, data):
  26         self._data = data
  27
  28     def __getitem__(self, key):
  29         hydrate_func = getattr(self, 'deserialize_{0}'.format(key),
  30                                lambda x: x)
  31         return hydrate_func(self._data.get(key))
  32
  33     def __setitem__(self, key, value):
  34         if key in self.read_only_fields:
  35             raise RuntimeError('Field \'%s\' is read-only' % key)
  36         dehydrate_func = getattr(self, 'serialize_{0}'.format(key),
  37                                  lambda x: x)
  38         self._data[key] = dehydrate_func(value)
  39         self._modified_fields.add(key)
  40
  41     def __str__(self):
  42         s = six.text_type(self.__unicode__())
  43         if not six.PY3:
  44             s = s.encode('utf-8')
  45         return s
  46
  47     def __repr__(self):
  48         return str(self)
  49
  50
  51 class TaskAnnotation(TaskResource):
  52     read_only_fields = ['entry', 'description']
  53
  54     def __init__(self, task, data={}):
  55         self.task = task
  56         self._load_data(data)
  57
  58     def deserialize_entry(self, data):
  59         return datetime.datetime.strptime(data, DATE_FORMAT) if data else None
  60
  61     def serialize_entry(self, date):
  62         return date.strftime(DATE_FORMAT) if date else ''
  63
  64     def remove(self):
  65         self.task.remove_annotation(self)
  66
  67     def __unicode__(self):
  68         return self['description']
  69
  70     __repr__ = __unicode__
  71
  72
  73 class Task(TaskResource):
  74     read_only_fields = ['id', 'entry', 'urgency']
  75
  76     class DoesNotExist(Exception):
  77         pass
  78
  79     class CompletedTask(Exception):
  80         """
  81         Raised when the operation cannot be performed on the completed task.
  82         """
  83         pass
  84
  85     class DeletedTask(Exception):
  86         """
  87         Raised when the operation cannot be performed on the deleted task.
  88         """
  89         pass
  90
  91     def __init__(self, warrior, data={}):
  92         self.warrior = warrior
  93         self._load_data(data)
  94         self._modified_fields = set()
  95
  96     def __unicode__(self):
  97         return self['description']
  98
  99     @property
 100     def completed(self):
 101         return self['status'] == six.text_type('completed')
 102
 103     @property
 104     def deleted(self):
 105         return self['status'] == six.text_type('deleted')
 106
 107     @property
 108     def waiting(self):
 109         return self['status'] == six.text_type('waiting')
 110
 111     @property
 112     def pending(self):
 113         return self['status'] == six.text_type('pending')
 114
 115     def serialize_due(self, date):
 116         return date.strftime(DATE_FORMAT)
 117
 118     def deserialize_due(self, date_str):
 119         if not date_str:
 120             return None
 121         return datetime.datetime.strptime(date_str, DATE_FORMAT)
 122
 123     def deserialize_annotations(self, data):
 124         return [TaskAnnotation(self, d) for d in data] if data else []
 125
 126     def deserialize_tags(self, tags):
 127         if isinstance(tags, basestring):
 128             return tags.split(',') if tags else []
 129         return tags
 130
 131     def serialize_tags(self, tags):
 132         return ','.join(tags) if tags else ''
 133
 134     def delete(self):
 135         # Refresh the status, and raise exception if the task is deleted
 136         self.refresh(only_fields=['status'])
 137
 138         if self.deleted:
 139             raise self.DeletedTask("Task was already deleted")
 140
 141         self.warrior.execute_command([self['id'], 'delete'], config_override={
 142             'confirmation': 'no',
 143         })
 144
 145         # Refresh the status again, so that we have updated info stored
 146         self.refresh(only_fields=['status'])
 147
 148
 149     def done(self):
 150         # Refresh, and raise exception if task is already completed/deleted
 151         self.refresh(only_fields=['status'])
 152
 153         if self.completed:
 154             raise self.CompletedTask("Cannot complete a completed task")
 155         elif self.deleted:
 156             raise self.DeletedTask("Deleted task cannot be completed")
 157
 158         self.warrior.execute_command([self['id'], 'done'])
 159
 160         # Refresh the status again, so that we have updated info stored
 161         self.refresh(only_fields=['status'])
 162
 163     def save(self):
 164         args = [self['id'], 'modify'] if self['id'] else ['add']
 165         args.extend(self._get_modified_fields_as_args())
 166         self.warrior.execute_command(args)
 167         self._modified_fields.clear()
 168
 169     def add_annotation(self, annotation):
 170         args = [self['id'], 'annotate', annotation]
 171         self.warrior.execute_command(args)
 172         self.refresh(only_fields=['annotations'])
 173
 174     def remove_annotation(self, annotation):
 175         if isinstance(annotation, TaskAnnotation):
 176             annotation = annotation['description']
 177         args = [self['id'], 'denotate', annotation]
 178         self.warrior.execute_command(args)
 179         self.refresh(only_fields=['annotations'])
 180
 181     def _get_modified_fields_as_args(self):
 182         args = []
 183         for field in self._modified_fields:
 184             args.append('{}:{}'.format(field, self._data[field]))
 185         return args
 186
 187     def refresh(self, only_fields=[]):
 188         args = [self['uuid'], 'export']
 189         new_data = json.loads(self.warrior.execute_command(args)[0])
 190         if only_fields:
 191             to_update = dict(
 192                 [(k, new_data.get(k)) for k in only_fields])
 193             self._data.update(to_update)
 194         else:
 195             self._data = new_data
 196
 197
 198 class TaskFilter(object):
 199     """
 200     A set of parameters to filter the task list with.
 201     """
 202
 203     def __init__(self, filter_params=[]):
 204         self.filter_params = filter_params
 205
 206     def add_filter(self, filter_str):
 207         self.filter_params.append(filter_str)
 208
 209     def add_filter_param(self, key, value):
 210         key = key.replace('__', '.')
 211
 212         # Replace the value with empty string, since that is the
 213         # convention in TW for empty values
 214         value = value if value is not None else ''
 215         self.filter_params.append('{0}:{1}'.format(key, value))
 216
 217     def get_filter_params(self):
 218         return [f for f in self.filter_params if f]
 219
 220     def clone(self):
 221         c = self.__class__()
 222         c.filter_params = list(self.filter_params)
 223         return c
 224
 225
 226 class TaskQuerySet(object):
 227     """
 228     Represents a lazy lookup for a task objects.
 229     """
 230
 231     def __init__(self, warrior=None, filter_obj=None):
 232         self.warrior = warrior
 233         self._result_cache = None
 234         self.filter_obj = filter_obj or TaskFilter()
 235
 236     def __deepcopy__(self, memo):
 237         """
 238         Deep copy of a QuerySet doesn't populate the cache
 239         """
 240         obj = self.__class__()
 241         for k, v in self.__dict__.items():
 242             if k in ('_iter', '_result_cache'):
 243                 obj.__dict__[k] = None
 244             else:
 245                 obj.__dict__[k] = copy.deepcopy(v, memo)
 246         return obj
 247
 248     def __repr__(self):
 249         data = list(self[:REPR_OUTPUT_SIZE + 1])
 250         if len(data) > REPR_OUTPUT_SIZE:
 251             data[-1] = "...(remaining elements truncated)..."
 252         return repr(data)
 253
 254     def __len__(self):
 255         if self._result_cache is None:
 256             self._result_cache = list(self)
 257         return len(self._result_cache)
 258
 259     def __iter__(self):
 260         if self._result_cache is None:
 261             self._result_cache = self._execute()
 262         return iter(self._result_cache)
 263
 264     def __getitem__(self, k):
 265         if self._result_cache is None:
 266             self._result_cache = list(self)
 267         return self._result_cache.__getitem__(k)
 268
 269     def __bool__(self):
 270         if self._result_cache is not None:
 271             return bool(self._result_cache)
 272         try:
 273             next(iter(self))
 274         except StopIteration:
 275             return False
 276         return True
 277
 278     def __nonzero__(self):
 279         return type(self).__bool__(self)
 280
 281     def _clone(self, klass=None, **kwargs):
 282         if klass is None:
 283             klass = self.__class__
 284         filter_obj = self.filter_obj.clone()
 285         c = klass(warrior=self.warrior, filter_obj=filter_obj)
 286         c.__dict__.update(kwargs)
 287         return c
 288
 289     def _execute(self):
 290         """
 291         Fetch the tasks which match the current filters.
 292         """
 293         return self.warrior.filter_tasks(self.filter_obj)
 294
 295     def all(self):
 296         """
 297         Returns a new TaskQuerySet that is a copy of the current one.
 298         """
 299         return self._clone()
 300
 301     def pending(self):
 302         return self.filter(status=PENDING)
 303
 304     def completed(self):
 305         return self.filter(status=COMPLETED)
 306
 307     def filter(self, *args, **kwargs):
 308         """
 309         Returns a new TaskQuerySet with the given filters added.
 310         """
 311         clone = self._clone()
 312         for f in args:
 313             clone.filter_obj.add_filter(f)
 314         for key, value in kwargs.items():
 315             clone.filter_obj.add_filter_param(key, value)
 316         return clone
 317
 318     def get(self, **kwargs):
 319         """
 320         Performs the query and returns a single object matching the given
 321         keyword arguments.
 322         """
 323         clone = self.filter(**kwargs)
 324         num = len(clone)
 325         if num == 1:
 326             return clone._result_cache[0]
 327         if not num:
 328             raise Task.DoesNotExist(
 329                 'Task matching query does not exist. '
 330                 'Lookup parameters were {0}'.format(kwargs))
 331         raise ValueError(
 332             'get() returned more than one Task -- it returned {0}! '
 333             'Lookup parameters were {1}'.format(num, kwargs))
 334
 335
 336 class TaskWarrior(object):
 337     def __init__(self, data_location='~/.task', create=True):
 338         data_location = os.path.expanduser(data_location)
 339         if create and not os.path.exists(data_location):
 340             os.makedirs(data_location)
 341         self.config = {
 342             'data.location': os.path.expanduser(data_location),
 343         }
 344         self.tasks = TaskQuerySet(self)
 345
 346     def _get_command_args(self, args, config_override={}):
 347         command_args = ['task', 'rc:/']
 348         config = self.config.copy()
 349         config.update(config_override)
 350         for item in config.items():
 351             command_args.append('rc.{0}={1}'.format(*item))
 352         command_args.extend(map(str, args))
 353         return command_args
 354
 355     def execute_command(self, args, config_override={}):
 356         command_args = self._get_command_args(
 357             args, config_override=config_override)
 358         logger.debug(' '.join(command_args))
 359         p = subprocess.Popen(command_args, stdout=subprocess.PIPE,
 360                              stderr=subprocess.PIPE)
 361         stdout, stderr = [x.decode('utf-8') for x in p.communicate()]
 362         if p.returncode:
 363             if stderr.strip():
 364                 error_msg = stderr.strip().splitlines()[-1]
 365             else:
 366                 error_msg = stdout.strip()
 367             raise TaskWarriorException(error_msg)
 368         return stdout.strip().split('\n')
 369
 370     def filter_tasks(self, filter_obj):
 371         args = ['export', '--'] + filter_obj.get_filter_params()
 372         tasks = []
 373         for line in self.execute_command(args):
 374             if line:
 375                 data = line.strip(',')
 376                 try:
 377                     tasks.append(Task(self, json.loads(data)))
 378                 except ValueError:
 379                     raise TaskWarriorException('Invalid JSON: %s' % data)
 380         return tasks
 381
 382     def merge_with(self, path, push=False):
 383         path = path.rstrip('/') + '/'
 384         self.execute_command(['merge', path], config_override={
 385             'merge.autopush': 'yes' if push else 'no',
 386         })
 387
 388     def undo(self):
 389         self.execute_command(['undo'], config_override={
 390             'confirmation': 'no',
 391         })