The next version will be 0.3.1

[etc/taskwarrior.git] / tasklib / task.py

diff --git a/tasklib/task.py b/tasklib/task.py
index f74e0d25510028853f52c4511b09d37956f32371..de0443caef2ad4732aafdbca31d393e860ac44ad 100644 (file)
--- a/tasklib/task.py
+++ b/tasklib/task.py
@@ -1,103 +1,330 @@
+import copy
+import datetime

 import json
 import json

+import logging

 import os
 import subprocess
 import os
 import subprocess

-import tempfile
-import uuid
-

 
 

+DATE_FORMAT = '%Y%m%dT%H%M%SZ'
+REPR_OUTPUT_SIZE = 10

 PENDING = 'pending'
 PENDING = 'pending'

+COMPLETED = 'completed'
+
+logger = logging.getLogger(__name__)

 
 
 class TaskWarriorException(Exception):
     pass
 
 
 
 
 class TaskWarriorException(Exception):
     pass
 
 

-class Task(object):
+class TaskResource(object):
+    read_only_fields = []

 
 

-    def __init__(self, warrior, data={}):
-        self.warrior = warrior
+    def _load_data(self, data):

         self._data = data
 
     def __getitem__(self, key):
         self._data = data
 
     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, value):
+        if key in self.read_only_fields:
+            raise RuntimeError('Field \'%s\' is read-only' % key)
+        dehydrate_func = getattr(self, 'serialize_{0}'.format(key),
+                                 lambda x: x)
+        self._data[key] = dehydrate_func(value)
+        self._modified_fields.add(key)
+
+    def __repr__(self):
+        return self.__unicode__()
+
+
+class TaskAnnotation(TaskResource):
+    read_only_fields = ['entry', 'description']
+
+    def __init__(self, task, data={}):
+        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 ''
+
+    def remove(self):
+        self.task.remove_annotation(self)
+
+    def __unicode__(self):
+        return self['description']
+
+    __repr__ = __unicode__
+
+
+class Task(TaskResource):
+    read_only_fields = ['id', 'entry', 'urgency']
+
+    class DoesNotExist(Exception):
+        pass

 
 

-    def __setitem__(self, key, val):
-        self._data[key] = val
+    def __init__(self, warrior, data={}):
+        self.warrior = warrior
+        self._load_data(data)
+        self._modified_fields = set()

 
     def __unicode__(self):
 
     def __unicode__(self):

-        return self._data.get('description')
+        return self['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 regenerate_uuid(self):
-        self['uuid'] = str(uuid.uuid4())
+    def deserialize_annotations(self, data):
+        return [TaskAnnotation(self, d) for d in data] if data else []
+
+    def deserialize_tags(self, tags):
+        if isinstance(tags, basestring):
+            return tags.split(',') if tags else []
+        return tags
+
+    def serialize_tags(self, tags):
+        return ','.join(tags) if tags else ''

 
     def delete(self):
 
     def delete(self):

-        self.warrior.delete_task(self['uuid'])
+        self.warrior.execute_command([self['id'], 'delete'], config_override={
+            'confirmation': 'no',
+        })

 
     def done(self):
 
     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()

 
 

-    __repr__ = __unicode__
+    def add_annotation(self, annotation):
+        args = [self['id'], 'annotate', annotation]
+        self.warrior.execute_command(args)
+        self.refresh(only_fields=['annotations'])

 
 

+    def remove_annotation(self, annotation):
+        if isinstance(annotation, TaskAnnotation):
+            annotation = annotation['description']
+        args = [self['id'], 'denotate', annotation]
+        self.warrior.execute_command(args)
+        self.refresh(only_fields=['annotations'])

 
 

-class TaskWarrior(object):
+    def _get_modified_fields_as_args(self):
+        args = []
+        for field in self._modified_fields:
+            args.append('{}:{}'.format(field, self._data[field]))
+        return args
+
+    def refresh(self, only_fields=[]):
+        args = [self['uuid'], 'export']
+        new_data = json.loads(self.warrior.execute_command(args)[0])
+        if only_fields:
+            to_update = dict(
+                [(k, new_data.get(k)) for k in only_fields])
+            self._data.update(to_update)
+        else:
+            self._data = new_data
+
+
+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):
     def __init__(self, data_location='~/.task', create=True):

-        if not os.path.exists(data_location):
+        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),
         }
             os.makedirs(data_location)
         self.config = {
             'data.location': os.path.expanduser(data_location),
         }

+        self.tasks = TaskQuerySet(self)
+
+    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 _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 _execute(self, command):
-        p = subprocess.Popen(self._generate_command(command), shell=True,
-                             stdout=subprocess.PIPE, stderr=subprocess.PIPE)
-        stdout, stderr = p.communicate()
+    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() for x in p.communicate()]

         if p.returncode:
         if p.returncode:

-            raise TaskWarriorException(stderr.strip())
+            if stderr.strip():
+                error_msg = stderr.strip().splitlines()[-1]
+            else:
+                error_msg = stdout.strip()
+            raise TaskWarriorException(error_msg)

         return stdout.strip().split('\n')
 
         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 = []
         tasks = []

-        for line in self._execute(command):
+        for line in self.execute_command(args):

             if line:
             if line:

-                tasks.append(Task(self, json.loads(line.strip(','))))
+                data = line.strip(',')
+                try:
+                    tasks.append(Task(self, json.loads(data)))
+                except ValueError:
+                    raise TaskWarriorException('Invalid JSON: %s' % data)

         return tasks
 
         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',
+        })