X-Git-Url: https://git.madduck.net/etc/taskwarrior.git/blobdiff_plain/e17985e0d4a7ce2eb83c580c71e2f7c1af7f093b..c013d19b33a5655da78bd294c42dd52749395c95:/tasklib/task.py

diff --git a/tasklib/task.py b/tasklib/task.py
index f74e0d2..e346f67 100644
--- a/tasklib/task.py
+++ b/tasklib/task.py
@@ -1,11 +1,16 @@
+import copy
+import datetime
 import json
+import logging
 import os
 import subprocess
-import tempfile
-import uuid
-
 
+DATE_FORMAT = '%Y%m%dT%H%M%SZ'
+REPR_OUTPUT_SIZE = 10
 PENDING = 'pending'
+COMPLETED = 'completed'
+
+logger = logging.getLogger(__name__)
 
 
 class TaskWarriorException(Exception):
@@ -14,90 +19,260 @@ class TaskWarriorException(Exception):
 
 class Task(object):
 
+    class DoesNotExist(Exception):
+        pass
+
     def __init__(self, warrior, data={}):
         self.warrior = warrior
         self._data = data
+        self._modified_fields = set()
+
+    def __unicode__(self):
+        return self['description']
 
     def __getitem__(self, key):
-        return self._data.get(key)
+        hydrate_func = getattr(self, 'deserialize_{0}'.format(key),
+                               lambda x: x)
+        return hydrate_func(self._data.get(key))
 
-    def __setitem__(self, key, val):
-        self._data[key] = val
+    def __setitem__(self, key, value):
+        dehydrate_func = getattr(self, 'serialize_{0}'.format(key),
+                                 lambda x: x)
+        self._data[key] = dehydrate_func(value)
+        self._modified_fields.add(key)
 
-    def __unicode__(self):
-        return self._data.get('description')
+    def serialize_due(self, date):
+        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_annotations(self, annotations):
+        ann_list = list(annotations)
+        for ann in ann_list:
+            ann['entry'] = ann['entry'].strftime(DATE_FORMAT)
+        return ann_list
+
+    def deserialize_annotations(self, annotations):
+        ann_list = list(annotations)
+        for ann in ann_list:
+            ann['entry'] = datetime.datetime.strptime(
+                ann['entry'], DATE_FORMAT)
+        return ann_list
+
+    def deserialize_tags(self, tags):
+        if isinstance(tags, basestring):
+            return tags.split(',') if tags else []
+        return tags
 
-    def regenerate_uuid(self):
-        self['uuid'] = str(uuid.uuid4())
+    def serialize_tags(self, tags):
+        return ','.join(tags) if tags else ''
 
     def delete(self):
-        self.warrior.delete_task(self['uuid'])
+        self.warrior.execute_command([self['id'], 'delete'], config_override={
+            'confirmation': 'no',
+        })
 
     def done(self):
-        self.warrior.complete_task(self['uuid'])
+        self.warrior.execute_command([self['id'], 'done'])
 
-    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])
+    def save(self):
+        args = [self['id'], 'modify'] if self['id'] else ['add']
+        args.extend(self._get_modified_fields_as_args())
+        self.warrior.execute_command(args)
+        self._modified_fields.clear()
+
+    def _get_modified_fields_as_args(self):
+        args = []
+        for field in self._modified_fields:
+            args.append('{}:{}'.format(field, self._data[field]))
+        return args
 
     __repr__ = __unicode__
 
 
-class TaskWarrior(object):
+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('__', '.')
+        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):
+        data_location = os.path.expanduser(data_location)
         if not os.path.exists(data_location):
             os.makedirs(data_location)
         self.config = {
             'data.location': os.path.expanduser(data_location),
         }
+        self.tasks = TaskQuerySet(self)
 
-    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 _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 _execute(self, command):
-        p = subprocess.Popen(self._generate_command(command), shell=True,
-                             stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    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 = p.communicate()
         if p.returncode:
-            raise TaskWarriorException(stderr.strip())
+            error_msg = stderr.strip().splitlines()[-1]
+            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(','))))
         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'], config_override={
+            'confirmation': 'no',
+        })