tasklib/task.py

   1 import copy
   2 import datetime
   3 import json
   4 import logging
   5 import os
   6 import subprocess
   7
   8 DATE_FORMAT = '%Y%m%dT%H%M%SZ'
   9 REPR_OUTPUT_SIZE = 10
  10 PENDING = 'pending'
  11 COMPLETED = 'completed'
  12
  13 logger = logging.getLogger(__name__)
  14
  15
  16 class TaskWarriorException(Exception):
  17     pass
  18
  19
  20 class Task(object):
  21
  22     class DoesNotExist(Exception):
  23         pass
  24
  25     def __init__(self, warrior, data={}):
  26         self.warrior = warrior
  27         self._data = data
  28         self._modified_fields = set()
  29
  30     def __unicode__(self):
  31         return self['description']
  32
  33     def __getitem__(self, key):
  34         hydrate_func = getattr(self, 'deserialize_{0}'.format(key),
  35                                lambda x: x)
  36         return hydrate_func(self._data.get(key))
  37
  38     def __setitem__(self, key, value):
  39         dehydrate_func = getattr(self, 'serialize_{0}'.format(key),
  40                                  lambda x: x)
  41         self._data[key] = dehydrate_func(value)
  42         self._modified_fields.add(key)
  43
  44     def serialize_due(self, date):
  45         return date.strftime(DATE_FORMAT)
  46
  47     def deserialize_due(self, date_str):
  48         if not date_str:
  49             return None
  50         return datetime.datetime.strptime(date_str, DATE_FORMAT)
  51
  52     def serialize_annotations(self, annotations):
  53         ann_list = list(annotations)
  54         for ann in ann_list:
  55             ann['entry'] = ann['entry'].strftime(DATE_FORMAT)
  56         return ann_list
  57
  58     def deserialize_annotations(self, annotations):
  59         ann_list = list(annotations)
  60         for ann in ann_list:
  61             ann['entry'] = datetime.datetime.strptime(
  62                 ann['entry'], DATE_FORMAT)
  63         return ann_list
  64
  65     def deserialize_tags(self, tags):
  66         if isinstance(tags, basestring):
  67             return tags.split(',') if tags else []
  68         return tags
  69
  70     def serialize_tags(self, tags):
  71         return ','.join(tags) if tags else ''
  72
  73     def delete(self):
  74         self.warrior.execute_command([self['id'], 'delete'], config_override={
  75             'confirmation': 'no',
  76         })
  77
  78     def done(self):
  79         self.warrior.execute_command([self['id'], 'done'])
  80
  81     def save(self):
  82         args = [self['id'], 'modify'] if self['id'] else ['add']
  83         args.extend(self._get_modified_fields_as_args())
  84         self.warrior.execute_command(args)
  85         self._modified_fields.clear()
  86
  87     def _get_modified_fields_as_args(self):
  88         args = []
  89         for field in self._modified_fields:
  90             args.append('{}:{}'.format(field, self._data[field]))
  91         return args
  92
  93     __repr__ = __unicode__
  94
  95
  96 class TaskFilter(object):
  97     """
  98     A set of parameters to filter the task list with.
  99     """
 100
 101     def __init__(self, filter_params=[]):
 102         self.filter_params = filter_params
 103
 104     def add_filter(self, filter_str):
 105         self.filter_params.append(filter_str)
 106
 107     def add_filter_param(self, key, value):
 108         key = key.replace('__', '.')
 109         self.filter_params.append('{0}:{1}'.format(key, value))
 110
 111     def get_filter_params(self):
 112         return [f for f in self.filter_params if f]
 113
 114     def clone(self):
 115         c = self.__class__()
 116         c.filter_params = list(self.filter_params)
 117         return c
 118
 119
 120 class TaskQuerySet(object):
 121     """
 122     Represents a lazy lookup for a task objects.
 123     """
 124
 125     def __init__(self, warrior=None, filter_obj=None):
 126         self.warrior = warrior
 127         self._result_cache = None
 128         self.filter_obj = filter_obj or TaskFilter()
 129
 130     def __deepcopy__(self, memo):
 131         """
 132         Deep copy of a QuerySet doesn't populate the cache
 133         """
 134         obj = self.__class__()
 135         for k, v in self.__dict__.items():
 136             if k in ('_iter', '_result_cache'):
 137                 obj.__dict__[k] = None
 138             else:
 139                 obj.__dict__[k] = copy.deepcopy(v, memo)
 140         return obj
 141
 142     def __repr__(self):
 143         data = list(self[:REPR_OUTPUT_SIZE + 1])
 144         if len(data) > REPR_OUTPUT_SIZE:
 145             data[-1] = "...(remaining elements truncated)..."
 146         return repr(data)
 147
 148     def __len__(self):
 149         if self._result_cache is None:
 150             self._result_cache = list(self)
 151         return len(self._result_cache)
 152
 153     def __iter__(self):
 154         if self._result_cache is None:
 155             self._result_cache = self._execute()
 156         return iter(self._result_cache)
 157
 158     def __getitem__(self, k):
 159         if self._result_cache is None:
 160             self._result_cache = list(self)
 161         return self._result_cache.__getitem__(k)
 162
 163     def __bool__(self):
 164         if self._result_cache is not None:
 165             return bool(self._result_cache)
 166         try:
 167             next(iter(self))
 168         except StopIteration:
 169             return False
 170         return True
 171
 172     def __nonzero__(self):
 173         return type(self).__bool__(self)
 174
 175     def _clone(self, klass=None, **kwargs):
 176         if klass is None:
 177             klass = self.__class__
 178         filter_obj = self.filter_obj.clone()
 179         c = klass(warrior=self.warrior, filter_obj=filter_obj)
 180         c.__dict__.update(kwargs)
 181         return c
 182
 183     def _execute(self):
 184         """
 185         Fetch the tasks which match the current filters.
 186         """
 187         return self.warrior.filter_tasks(self.filter_obj)
 188
 189     def all(self):
 190         """
 191         Returns a new TaskQuerySet that is a copy of the current one.
 192         """
 193         return self._clone()
 194
 195     def pending(self):
 196         return self.filter(status=PENDING)
 197
 198     def completed(self):
 199         return self.filter(status=COMPLETED)
 200
 201     def filter(self, *args, **kwargs):
 202         """
 203         Returns a new TaskQuerySet with the given filters added.
 204         """
 205         clone = self._clone()
 206         for f in args:
 207             clone.filter_obj.add_filter(f)
 208         for key, value in kwargs.items():
 209             clone.filter_obj.add_filter_param(key, value)
 210         return clone
 211
 212     def get(self, **kwargs):
 213         """
 214         Performs the query and returns a single object matching the given
 215         keyword arguments.
 216         """
 217         clone = self.filter(**kwargs)
 218         num = len(clone)
 219         if num == 1:
 220             return clone._result_cache[0]
 221         if not num:
 222             raise Task.DoesNotExist(
 223                 'Task matching query does not exist. '
 224                 'Lookup parameters were {0}'.format(kwargs))
 225         raise ValueError(
 226             'get() returned more than one Task -- it returned {0}! '
 227             'Lookup parameters were {1}'.format(num, kwargs))
 228
 229
 230 class TaskWarrior(object):
 231     def __init__(self, data_location='~/.task', create=True):
 232         data_location = os.path.expanduser(data_location)
 233         if create and not os.path.exists(data_location):
 234             os.makedirs(data_location)
 235         self.config = {
 236             'data.location': os.path.expanduser(data_location),
 237         }
 238         self.tasks = TaskQuerySet(self)
 239
 240     def _get_command_args(self, args, config_override={}):
 241         command_args = ['task', 'rc:/']
 242         config = self.config.copy()
 243         config.update(config_override)
 244         for item in config.items():
 245             command_args.append('rc.{0}={1}'.format(*item))
 246         command_args.extend(map(str, args))
 247         return command_args
 248
 249     def execute_command(self, args, config_override={}):
 250         command_args = self._get_command_args(
 251             args, config_override=config_override)
 252         logger.debug(' '.join(command_args))
 253         p = subprocess.Popen(command_args, stdout=subprocess.PIPE,
 254                              stderr=subprocess.PIPE)
 255         stdout, stderr = p.communicate()
 256         if p.returncode:
 257             if stderr.strip():
 258                 error_msg = stderr.strip().splitlines()[-1]
 259             else:
 260                 error_msg = stdout.strip()
 261             raise TaskWarriorException(error_msg)
 262         return stdout.strip().split('\n')
 263
 264     def filter_tasks(self, filter_obj):
 265         args = ['export', '--'] + filter_obj.get_filter_params()
 266         tasks = []
 267         for line in self.execute_command(args):
 268             if line:
 269                 data = line.strip(',')
 270                 try:
 271                     tasks.append(Task(self, json.loads(data)))
 272                 except ValueError:
 273                     raise TaskWarriorException('Invalid JSON: %s' % data)
 274         return tasks
 275
 276     def merge_with(self, path, push=False):
 277         path = path.rstrip('/') + '/'
 278         self.execute_command(['merge', path], config_override={
 279             'merge.autopush': 'yes' if push else 'no',
 280         })
 281
 282     def undo(self):
 283         self.execute_command(['undo'], config_override={
 284             'confirmation': 'no',
 285         })