tasklib/task.py

   1 import copy
   2 import datetime
   3 import json
   4 import os
   5 import subprocess
   6 import tempfile
   7 import uuid
   8
   9
  10 DATE_FORMAT = '%Y%m%dT%H%M%SZ'
  11
  12 REPR_OUTPUT_SIZE = 10
  13
  14 PENDING = 'pending'
  15
  16
  17 class TaskWarriorException(Exception):
  18     pass
  19
  20
  21 class Task(object):
  22
  23     class DoesNotExist(Exception):
  24         pass
  25
  26     def __init__(self, warrior, data={}):
  27         self.warrior = warrior
  28         self._data = data
  29
  30     def __getitem__(self, key):
  31         return self._get_field(key)
  32
  33     def __setitem__(self, key, val):
  34         self._data[key] = val
  35
  36     def __unicode__(self):
  37         return self._data.get('description')
  38
  39     def _get_field(self, key):
  40         hydrate_func = getattr(self, 'deserialize_{0}'.format(key), lambda x:x)
  41         return hydrate_func(self._data.get(key))
  42
  43     def _set_field(self, key, value):
  44         dehydrate_func = getattr(self, 'serialize_{0}'.format(key), lambda x:x)
  45         self._data[key] = dehydrate_func(value)
  46
  47     def serialize_due(self, date):
  48         return date.strftime(DATE_FORMAT)
  49
  50     def deserialize_due(self, date_str):
  51         if not date_str:
  52             return None
  53         return datetime.datetime.strptime(date_str, DATE_FORMAT)
  54
  55     def serialize_annotations(self, annotations):
  56         ann_list = list(annotations)
  57         for ann in ann_list:
  58             ann['entry'] = ann['entry'].strftime(DATE_FORMAT)
  59         return ann_list
  60
  61     def deserialize_annotations(self, annotations):
  62         ann_list = list(annotations)
  63         for ann in ann_list:
  64             ann['entry'] = datetime.datetime.strptime(
  65                 ann['entry'], DATE_FORMAT)
  66         return ann_list
  67
  68     def regenerate_uuid(self):
  69         self['uuid'] = str(uuid.uuid4())
  70
  71     def delete(self):
  72         self.warrior.delete_task(self['uuid'])
  73
  74     def done(self):
  75         self.warrior.complete_task(self['uuid'])
  76
  77     def save(self, delete_first=True):
  78         if self['uuid'] and delete_first:
  79             self.delete()
  80         if not self['uuid'] or delete_first:
  81             self.regenerate_uuid()
  82         self.warrior.import_tasks([self._data])
  83
  84     __repr__ = __unicode__
  85
  86
  87 class TaskFilter(object):
  88     """
  89     A set of parameters to filter the task list with.
  90     """
  91
  92     def __init__(self, filter_params=[]):
  93         self.filter_params = filter_params
  94
  95     def add_filter(self, filter_str):
  96         self.filter_params.append(filter_str)
  97
  98     def add_filter_param(self, key, value):
  99         key = key.replace('__', '.')
 100         self.filter_params.append('{0}:{1}'.format(key, value))
 101
 102     def get_filter_params(self):
 103         return [f for f in self.filter_params if f]
 104
 105     def clone(self):
 106         c = self.__class__()
 107         c.filter_params = list(self.filter_params)
 108         return c
 109
 110
 111 class TaskQuerySet(object):
 112     """
 113     Represents a lazy lookup for a task objects.
 114     """
 115
 116     def __init__(self, warrior=None, filter_obj=None):
 117         self.warrior = warrior
 118         self._result_cache = None
 119         self.filter_obj = filter_obj or TaskFilter()
 120
 121     def __deepcopy__(self, memo):
 122         """
 123         Deep copy of a QuerySet doesn't populate the cache
 124         """
 125         obj = self.__class__()
 126         for k,v in self.__dict__.items():
 127             if k in ('_iter','_result_cache'):
 128                 obj.__dict__[k] = None
 129             else:
 130                 obj.__dict__[k] = copy.deepcopy(v, memo)
 131         return obj
 132
 133     def __repr__(self):
 134         data = list(self[:REPR_OUTPUT_SIZE + 1])
 135         if len(data) > REPR_OUTPUT_SIZE:
 136             data[-1] = "...(remaining elements truncated)..."
 137         return repr(data)
 138
 139     def __len__(self):
 140         if self._result_cache is None:
 141             self._result_cache = list(self)
 142         return len(self._result_cache)
 143
 144     def __iter__(self):
 145         if self._result_cache is None:
 146             self._result_cache = self._execute()
 147         return iter(self._result_cache)
 148
 149     def __getitem__(self, k):
 150         if self._result_cache is None:
 151             self._result_cache = list(self)
 152         return self._result_cache.__getitem__(k)
 153
 154     def __bool__(self):
 155         if self._result_cache is not None:
 156             return bool(self._result_cache)
 157         try:
 158             next(iter(self))
 159         except StopIteration:
 160             return False
 161         return True
 162
 163     def __nonzero__(self):
 164         return type(self).__bool__(self)
 165
 166     def _clone(self, klass=None, **kwargs):
 167         if klass is None:
 168             klass = self.__class__
 169         filter_obj = self.filter_obj.clone()
 170         c = klass(warrior=self.warrior, filter_obj=filter_obj)
 171         c.__dict__.update(kwargs)
 172         return c
 173
 174     def _execute(self):
 175         """
 176         Fetch the tasks which match the current filters.
 177         """
 178         return self.warrior.filter_tasks(self.filter_obj)
 179
 180     def all(self):
 181         """
 182         Returns a new TaskQuerySet that is a copy of the current one.
 183         """
 184         return self._clone()
 185
 186     def pending(self):
 187         return self.filter(status=PENDING)
 188
 189     def filter(self, *args, **kwargs):
 190         """
 191         Returns a new TaskQuerySet with the given filters added.
 192         """
 193         clone = self._clone()
 194         for f in args:
 195             clone.filter_obj.add_filter(f)
 196         for key, value in kwargs.items():
 197             clone.filter_obj.add_filter_param(key, value)
 198         return clone
 199
 200     def get(self, **kwargs):
 201         """
 202         Performs the query and returns a single object matching the given
 203         keyword arguments.
 204         """
 205         clone = self.filter(**kwargs)
 206         num = len(clone)
 207         if num == 1:
 208             return clone._result_cache[0]
 209         if not num:
 210             raise Task.DoesNotExist(
 211                 'Task matching query does not exist. '
 212                 'Lookup parameters were {0}'.format(kwargs))
 213         raise ValueError(
 214             'get() returned more than one Task -- it returned {0}! '
 215             'Lookup parameters were {1}'.format(num, kwargs))
 216
 217
 218 class TaskWarrior(object):
 219     DEFAULT_FILTERS = {
 220         'status': 'pending',
 221     }
 222
 223     def __init__(self, data_location='~/.task', create=True):
 224         if not os.path.exists(data_location):
 225             os.makedirs(data_location)
 226         self.config = {
 227             'data.location': os.path.expanduser(data_location),
 228         }
 229         self.tasks = TaskQuerySet(self)
 230
 231     def _get_command_args(self, args):
 232         command_args = ['task', 'rc:/']
 233         for item in self.config.items():
 234             command_args.append('rc.{0}={1}'.format(*item))
 235         command_args.extend(args)
 236         return command_args
 237
 238     def _execute_command(self, args):
 239         p = subprocess.Popen(self._get_command_args(args),
 240                              stdout=subprocess.PIPE, stderr=subprocess.PIPE)
 241         stdout, stderr = p.communicate()
 242         if p.returncode:
 243             raise TaskWarriorException(stderr.strip())
 244         return stdout.strip().split('\n')
 245
 246     def filter_tasks(self, filter_obj):
 247         args = ['export', '--'] + filter_obj.get_filter_params()
 248         tasks = []
 249         for line in self._execute_command(args):
 250             if line:
 251                 tasks.append(Task(self, json.loads(line.strip(','))))
 252         return tasks
 253
 254     def add_task(self, description, project=None):
 255         args = ['add', description]
 256         if project is not None:
 257             args.append('project:{0}'.format(project))
 258         self._execute_command(args)
 259
 260     def delete_task(self, task_id):
 261         args = [task_id, 'rc.confirmation:no', 'delete']
 262         self._execute_command(args)
 263
 264     def complete_task(self, task_id):
 265         args = [task_id, 'done']
 266         self._execute_command(args)
 267
 268     def import_tasks(self, tasks):
 269         fd, path = tempfile.mkstemp()
 270         with open(path, 'w') as f:
 271             f.write(json.dumps(tasks))
 272         args = ['import', path]
 273         self._execute_command(args)