Task: Make Task object non-iterable

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

diff --git a/tasklib/task.py b/tasklib/task.py
index 411ce7a1ba3152037c306523ae65373b5aa18697..096f656d7d9e903ecebd3b6a2c36f58b568afb79 100644 (file)
--- a/tasklib/task.py
+++ b/tasklib/task.py
@@ -1,48 +1,157 @@
+from __future__ import print_function

 import copy
 import datetime
 import json
 import copy
 import datetime
 import json

+import logging

 import os
 import os

+import six

 import subprocess
 import subprocess

-import tempfile
-import uuid
-

 
 DATE_FORMAT = '%Y%m%dT%H%M%SZ'
 
 DATE_FORMAT = '%Y%m%dT%H%M%SZ'

-

 REPR_OUTPUT_SIZE = 10
 REPR_OUTPUT_SIZE = 10

-

 PENDING = 'pending'
 PENDING = 'pending'

+COMPLETED = 'completed'
+
+VERSION_2_1_0 = six.u('2.1.0')
+VERSION_2_2_0 = six.u('2.2.0')
+VERSION_2_3_0 = six.u('2.3.0')
+VERSION_2_4_0 = six.u('2.4.0')
+
+logger = logging.getLogger(__name__)

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

-class Task(object):
+class TaskResource(object):
+    read_only_fields = []
+
+    def _load_data(self, data):
+        self._data = data
+        # We need to use a copy for original data, so that changes
+        # are not propagated
+        self._original_data = data.copy()
+
+    def __getitem__(self, key):
+        # This is a workaround to make TaskResource non-iterable
+        # over simple index-based iteration
+        try:
+            int(key)
+            raise StopIteration
+        except ValueError:
+            pass
+
+        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)
+
+    def __str__(self):
+        s = six.text_type(self.__unicode__())
+        if not six.PY3:
+            s = s.encode('utf-8')
+        return s
+
+    def __repr__(self):
+        return str(self)
+
+
+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', 'uuid']

 
     class DoesNotExist(Exception):
         pass
 
 
     class DoesNotExist(Exception):
         pass
 

-    def __init__(self, warrior, data={}):
+    class CompletedTask(Exception):
+        """
+        Raised when the operation cannot be performed on the completed task.
+        """
+        pass
+
+    class DeletedTask(Exception):
+        """
+        Raised when the operation cannot be performed on the deleted task.
+        """
+        pass
+
+    class NotSaved(Exception):
+        """
+        Raised when the operation cannot be performed on the task, because
+        it has not been saved to TaskWarrior yet.
+        """
+        pass
+
+    def __init__(self, warrior, data={}, **kwargs):

         self.warrior = warrior
         self.warrior = warrior

-        self._data = data

 
 

-    def __getitem__(self, key):
-        return self._get_field(key)
+        # We keep data for backwards compatibility
+        kwargs.update(data)

 
 

-    def __setitem__(self, key, val):
-        self._data[key] = val
+        self._load_data(kwargs)

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

-        return self._data.get('description')
+        return self['description']

 
 

-    def _get_field(self, key):
-        hydrate_func = getattr(self, 'deserialize_{0}'.format(key), lambda x:x)
-        return hydrate_func(self._data.get(key))
+    def __eq__(self, other):
+        return self['uuid'] == other['uuid']

 
 

-    def _set_field(self, key, value):
-        dehydrate_func = getattr(self, 'serialize_{0}'.format(key), lambda x:x)
-        self._data[key] = dehydrate_func(value)
+    def __hash__(self):
+        return self['uuid'].__hash__()
+
+    @property
+    def _modified_fields(self):
+        for key in self._data.keys():
+            if self._data.get(key) != self._original_data.get(key):
+                yield key
+
+    @property
+    def completed(self):
+        return self['status'] == six.text_type('completed')
+
+    @property
+    def deleted(self):
+        return self['status'] == six.text_type('deleted')
+
+    @property
+    def waiting(self):
+        return self['status'] == six.text_type('waiting')
+
+    @property
+    def pending(self):
+        return self['status'] == six.text_type('pending')
+
+    @property
+    def saved(self):
+        return self['uuid'] is not None or self['id'] is not None

 
     def serialize_due(self, date):
         return date.strftime(DATE_FORMAT)
 
     def serialize_due(self, date):
         return date.strftime(DATE_FORMAT)


@@ -52,36 +161,135 @@ class Task(object):
             return None
         return datetime.datetime.strptime(date_str, DATE_FORMAT)
 
             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, data):
+        return [TaskAnnotation(self, d) for d in data] if data else []

 
 

-    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):
 
     def delete(self):

-        self.warrior.delete_task(self['uuid'])
+        if not self.saved:
+            raise Task.NotSaved("Task needs to be saved before it can be deleted")
+
+        # Refresh the status, and raise exception if the task is deleted
+        self.refresh(only_fields=['status'])
+
+        if self.deleted:
+            raise Task.DeletedTask("Task was already deleted")
+
+        self.warrior.execute_command([self['uuid'], 'delete'], config_override={
+            'confirmation': 'no',
+        })
+
+        # Refresh the status again, so that we have updated info stored
+        self.refresh(only_fields=['status'])
+

 
     def done(self):
 
     def done(self):

-        self.warrior.complete_task(self['uuid'])
+        if not self.saved:
+            raise Task.NotSaved("Task needs to be saved before it can be completed")

 
 

-    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])
+        # Refresh, and raise exception if task is already completed/deleted
+        self.refresh(only_fields=['status'])

 
 

-    __repr__ = __unicode__
+        if self.completed:
+            raise Task.CompletedTask("Cannot complete a completed task")
+        elif self.deleted:
+            raise Task.DeletedTask("Deleted task cannot be completed")
+
+        self.warrior.execute_command([self['uuid'], 'done'])
+
+        # Refresh the status again, so that we have updated info stored
+        self.refresh(only_fields=['status'])
+
+    def save(self):
+        args = [self['uuid'], 'modify'] if self.saved else ['add']
+        args.extend(self._get_modified_fields_as_args())
+        output = self.warrior.execute_command(args)
+
+        # Parse out the new ID, if the task is being added for the first time
+        if not self.saved:
+            id_lines = [l for l in output if l.startswith('Created task ')]
+
+            # Complain loudly if it seems that more tasks were created
+            # Should not happen
+            if len(id_lines) != 1 or len(id_lines[0].split(' ')) != 3:
+                raise TaskWarriorException("Unexpected output when creating "
+                                           "task: %s" % '\n'.join(id_lines))
+
+            # Circumvent the ID storage, since ID is considered read-only
+            self._data['id'] = int(id_lines[0].split(' ')[2].rstrip('.'))
+
+        self.refresh()
+
+    def add_annotation(self, annotation):
+        if not self.saved:
+            raise Task.NotSaved("Task needs to be saved to add annotation")
+
+        args = [self['uuid'], 'annotate', annotation]
+        self.warrior.execute_command(args)
+        self.refresh(only_fields=['annotations'])
+
+    def remove_annotation(self, annotation):
+        if not self.saved:
+            raise Task.NotSaved("Task needs to be saved to add annotation")
+
+        if isinstance(annotation, TaskAnnotation):
+            annotation = annotation['description']
+        args = [self['uuid'], 'denotate', annotation]
+        self.warrior.execute_command(args)
+        self.refresh(only_fields=['annotations'])
+
+    def _get_modified_fields_as_args(self):
+        args = []
+
+        def add_field(field):
+            # Task version older than 2.4.0 ignores first word of the
+            # task description if description: prefix is used
+            if self.warrior.version < VERSION_2_4_0 and field == 'description':
+                args.append(self._data[field])
+            else:
+                args.append('{0}:{1}'.format(field, self._data[field]))
+
+        # If we're modifying saved task, simply pass on all modified fields
+        if self.saved:
+            for field in self._modified_fields:
+                add_field(field)
+        # For new tasks, pass all fields that make sense
+        else:
+            for field in self._data.keys():
+                if field in self.read_only_fields:
+                    continue
+                add_field(field)
+
+        return args
+
+    def refresh(self, only_fields=[]):
+        # Raise error when trying to refresh a task that has not been saved
+        if not self.saved:
+            raise Task.NotSaved("Task needs to be saved to be refreshed")
+
+        # We need to use ID as backup for uuid here for the refreshes
+        # of newly saved tasks. Any other place in the code is fine
+        # with using UUID only.
+        args = [self['uuid'] or self['id'], '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)
+            self._original_data.update(to_update)
+        else:
+            self._data = new_data
+            # We need to create a clone for original_data though
+            # Shallow copy is alright, since data dict uses only
+            # primitive data types
+            self._original_data = new_data.copy()

 
 
 class TaskFilter(object):
 
 
 class TaskFilter(object):


@@ -97,7 +305,17 @@ class TaskFilter(object):
 
     def add_filter_param(self, key, value):
         key = key.replace('__', '.')
 
     def add_filter_param(self, key, value):
         key = key.replace('__', '.')

-        self.filter_params.append('{0}:{1}'.format(key, value))
+
+        # Replace the value with empty string, since that is the
+        # convention in TW for empty values
+        value = value if value is not None else ''
+
+        # If we are filtering by uuid:, do not use uuid keyword
+        # due to TW-1452 bug
+        if key == 'uuid':
+            self.filter_params.insert(0, value)
+        else:
+            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 get_filter_params(self):
         return [f for f in self.filter_params if f]


@@ -123,8 +341,8 @@ class TaskQuerySet(object):
         Deep copy of a QuerySet doesn't populate the cache
         """
         obj = self.__class__()
         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'):
+        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)
                 obj.__dict__[k] = None
             else:
                 obj.__dict__[k] = copy.deepcopy(v, memo)


@@ -186,6 +404,9 @@ class TaskQuerySet(object):
     def pending(self):
         return self.filter(status=PENDING)
 
     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.
     def filter(self, *args, **kwargs):
         """
         Returns a new TaskQuerySet with the given filters added.


@@ -217,12 +438,14 @@ class TaskQuerySet(object):
 
 class TaskWarrior(object):
     def __init__(self, data_location='~/.task', create=True):
 
 class TaskWarrior(object):
     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),
         }
         self.tasks = TaskQuerySet(self)
             os.makedirs(data_location)
         self.config = {
             'data.location': os.path.expanduser(data_location),
         }
         self.tasks = TaskQuerySet(self)

+        self.version = self._get_version()

 
     def _get_command_args(self, args, config_override={}):
         command_args = ['task', 'rc:/']
 
     def _get_command_args(self, args, config_override={}):
         command_args = ['task', 'rc:/']


@@ -230,15 +453,29 @@ class TaskWarrior(object):
         config.update(config_override)
         for item in config.items():
             command_args.append('rc.{0}={1}'.format(*item))
         config.update(config_override)
         for item in config.items():
             command_args.append('rc.{0}={1}'.format(*item))

-        command_args.extend(args)
+        command_args.extend(map(str, args))

         return command_args
 
         return command_args
 

+    def _get_version(self):
+        p = subprocess.Popen(
+                ['task', '--version'],
+                stdout=subprocess.PIPE,
+                stderr=subprocess.PIPE)
+        stdout, stderr = [x.decode('utf-8') for x in p.communicate()]
+        return stdout.strip('\n')
+

     def execute_command(self, args, config_override={}):
     def execute_command(self, args, config_override={}):

-        p = subprocess.Popen(self._get_command_args(args),
-                             stdout=subprocess.PIPE, stderr=subprocess.PIPE)
-        stdout, stderr = p.communicate()
+        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('utf-8') for x in p.communicate()]

         if p.returncode:
         if p.returncode:

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

             raise TaskWarriorException(error_msg)
         return stdout.strip().split('\n')
 
             raise TaskWarriorException(error_msg)
         return stdout.strip().split('\n')
 


@@ -247,33 +484,20 @@ class TaskWarrior(object):
         tasks = []
         for line in self.execute_command(args):
             if line:
         tasks = []
         for line in self.execute_command(args):
             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 add_task(self, description, project=None):
-        args = ['add', description]
-        if project is not None:
-            args.append('project:{0}'.format(project))
-        self.execute_command(args)
-
-    def delete_task(self, task_id):
-        args = [task_id, 'rc.confirmation:no', 'delete']
-        self.execute_command(args)
-
-    def complete_task(self, task_id):
-        args = [task_id, 'done']
-        self.execute_command(args)
-
-    def import_tasks(self, tasks):
-        fd, path = tempfile.mkstemp()
-        with open(path, 'w') as f:
-            f.write(json.dumps(tasks))
-        args = ['import', path]
-        self.execute_command(args)
-

     def merge_with(self, path, push=False):
         path = path.rstrip('/') + '/'
     def merge_with(self, path, push=False):
         path = path.rstrip('/') + '/'

-        args = ['merge', path]
-        self.execute_command(args, config_override={
+        self.execute_command(['merge', path], config_override={

             'merge.autopush': 'yes' if push else 'no',
         })
             'merge.autopush': 'yes' if push else 'no',
         })

+
+    def undo(self):
+        self.execute_command(['undo'], config_override={
+            'confirmation': 'no',
+        })