]> git.madduck.net Git - etc/taskwarrior.git/blobdiff - tasklib/task.py

madduck's git repository

Every one of the projects in this repository is available at the canonical URL git://git.madduck.net/madduck/pub/<projectpath> — see each project's metadata for the exact URL.

All patches and comments are welcome. Please squash your changes to logical commits before using git-format-patch and git-send-email to patches@git.madduck.net. If you'd read over the Git project's submission guidelines and adhered to them, I'd be especially grateful.

SSH access, as well as push access can be individually arranged.

If you use my repositories frequently, consider adding the following snippet to ~/.gitconfig and using the third clone URL listed for each project:

[url "git://git.madduck.net/madduck/"]
  insteadOf = madduck:

travis: Taskwarrior 2.5.1 is not yet released
[etc/taskwarrior.git] / tasklib / task.py
index 6de828f92cd458702690516de6548c3a1635c8ff..5eabc65178d2ae930835d6508a04ad45f0eafe0c 100644 (file)
 from __future__ import print_function
 import copy
-import datetime
+import importlib
 import json
 import logging
 import os
 import six
 import sys
-import subprocess
+
+from .serializing import SerializingObject
 
 DATE_FORMAT = '%Y%m%dT%H%M%SZ'
 REPR_OUTPUT_SIZE = 10
 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 SerializingObject(object):
+class ReadOnlyDictView(object):
     """
-    Common ancestor for TaskResource & TaskFilter, since they both
-    need to serialize arguments.
+    Provides simplified read-only view upon dict object.
     """
 
-    def _deserialize(self, key, value):
-        hydrate_func = getattr(self, 'deserialize_{0}'.format(key),
-                               lambda x: x if x != '' else None)
-        return hydrate_func(value)
-
-    def _serialize(self, key, value):
-        dehydrate_func = getattr(self, 'serialize_{0}'.format(key),
-                                 lambda x: x if x is not None else '')
-        return dehydrate_func(value)
-
-    def timestamp_serializer(self, date):
-        if not date:
-            return None
-        return date.strftime(DATE_FORMAT)
-
-    def timestamp_deserializer(self, date_str):
-        if not date_str:
-            return None
-        return datetime.datetime.strptime(date_str, DATE_FORMAT)
-
-    def serialize_entry(self, value):
-        return self.timestamp_serializer(value)
-
-    def deserialize_entry(self, value):
-        return self.timestamp_deserializer(value)
-
-    def serialize_modified(self, value):
-        return self.timestamp_serializer(value)
-
-    def deserialize_modified(self, value):
-        return self.timestamp_deserializer(value)
+    def __init__(self, viewed_dict):
+        self.viewed_dict = viewed_dict
 
-    def serialize_due(self, value):
-        return self.timestamp_serializer(value)
-
-    def deserialize_due(self, value):
-        return self.timestamp_deserializer(value)
-
-    def serialize_scheduled(self, value):
-        return self.timestamp_serializer(value)
-
-    def deserialize_scheduled(self, value):
-        return self.timestamp_deserializer(value)
-
-    def serialize_until(self, value):
-        return self.timestamp_serializer(value)
+    def __getitem__(self, key):
+        return copy.deepcopy(self.viewed_dict.__getitem__(key))
 
-    def deserialize_until(self, value):
-        return self.timestamp_deserializer(value)
+    def __contains__(self, k):
+        return self.viewed_dict.__contains__(k)
 
-    def serialize_wait(self, value):
-        return self.timestamp_serializer(value)
+    def __iter__(self):
+        for value in self.viewed_dict:
+            yield copy.deepcopy(value)
 
-    def deserialize_wait(self, value):
-        return self.timestamp_deserializer(value)
+    def __len__(self):
+        return len(self.viewed_dict)
 
-    def deserialize_annotations(self, data):
-        return [TaskAnnotation(self, d) for d in data] if data else []
+    def __unicode__(self):
+        return six.u('ReadOnlyDictView: {0}'.format(repr(self.viewed_dict)))
 
-    def serialize_tags(self, tags):
-        return ','.join(tags) if tags else ''
+    __repr__ = __unicode__
 
-    def deserialize_tags(self, tags):
-        if isinstance(tags, six.string_types):
-            return tags.split(',') if tags else []
-        return tags or []
+    def get(self, key, default=None):
+        return copy.deepcopy(self.viewed_dict.get(key, default))
 
-    def serialize_depends(self, cur_dependencies):
-        # Return the list of uuids
-        return ','.join(task['uuid'] for task in cur_dependencies)
+    def items(self):
+        return [copy.deepcopy(v) for v in self.viewed_dict.items()]
 
-    def deserialize_depends(self, raw_uuids):
-        raw_uuids = raw_uuids or ''  # Convert None to empty string
-        uuids = raw_uuids.split(',')
-        return set(self.warrior.tasks.get(uuid=uuid) for uuid in uuids if uuid)
+    def values(self):
+        return [copy.deepcopy(v) for v in self.viewed_dict.values()]
 
 
 class TaskResource(SerializingObject):
@@ -118,7 +63,7 @@ class TaskResource(SerializingObject):
         # are not propagated.
         self._original_data = copy.deepcopy(self._data)
 
-    def _update_data(self, data, update_original=False):
+    def _update_data(self, data, update_original=False, remove_missing=False):
         """
         Low level update of the internal _data dict. Data which are coming as
         updates should already be serialized. If update_original is True, the
@@ -127,10 +72,14 @@ class TaskResource(SerializingObject):
         self._data.update(dict((key, self._deserialize(key, value))
                                for key, value in data.items()))
 
+        # In certain situations, we want to treat missing keys as removals
+        if remove_missing:
+            for key in set(self._data.keys()) - set(data.keys()):
+                self._data[key] = None
+
         if update_original:
             self._original_data = copy.deepcopy(self._data)
 
-
     def __getitem__(self, key):
         # This is a workaround to make TaskResource non-iterable
         # over simple index-based iteration
@@ -148,6 +97,9 @@ class TaskResource(SerializingObject):
     def __setitem__(self, key, value):
         if key in self.read_only_fields:
             raise RuntimeError('Field \'%s\' is read-only' % key)
+
+        # Normalize the user input before saving it
+        value = self._normalize(key, value)
         self._data[key] = value
 
     def __str__(self):
@@ -159,13 +111,48 @@ class TaskResource(SerializingObject):
     def __repr__(self):
         return str(self)
 
+    def export_data(self):
+        """
+        Exports current data contained in the Task as JSON
+        """
+
+        # We need to remove spaces for TW-1504, use custom separators
+        data_tuples = ((key, self._serialize(key, value))
+                       for key, value in six.iteritems(self._data))
+
+        # Empty string denotes empty serialized value, we do not want
+        # to pass that to TaskWarrior.
+        data_tuples = filter(lambda t: t[1] is not '', data_tuples)
+        data = dict(data_tuples)
+        return json.dumps(data, separators=(',', ':'))
+
+    @property
+    def _modified_fields(self):
+        writable_fields = set(self._data.keys()) - set(self.read_only_fields)
+        for key in writable_fields:
+            new_value = self._data.get(key)
+            old_value = self._original_data.get(key)
+
+            # Make sure not to mark data removal as modified field if the
+            # field originally had some empty value
+            if key in self._data and not new_value and not old_value:
+                continue
+
+            if new_value != old_value:
+                yield key
+
+    @property
+    def modified(self):
+        return bool(list(self._modified_fields))
+
 
 class TaskAnnotation(TaskResource):
     read_only_fields = ['entry', 'description']
 
-    def __init__(self, task, data={}):
+    def __init__(self, task, data=None):
         self.task = task
-        self._load_data(data)
+        self._load_data(data or dict())
+        super(TaskAnnotation, self).__init__(task.backend)
 
     def remove(self):
         self.task.remove_annotation(self)
@@ -199,6 +186,18 @@ class Task(TaskResource):
         """
         pass
 
+    class ActiveTask(Exception):
+        """
+        Raised when the operation cannot be performed on the active task.
+        """
+        pass
+
+    class InactiveTask(Exception):
+        """
+        Raised when the operation cannot be performed on an inactive task.
+        """
+        pass
+
     class NotSaved(Exception):
         """
         Raised when the operation cannot be performed on the task, because
@@ -207,7 +206,7 @@ class Task(TaskResource):
         pass
 
     @classmethod
-    def from_input(cls, input_file=sys.stdin, modify=None):
+    def from_input(cls, input_file=sys.stdin, modify=None, backend=None):
         """
         Creates a Task object, directly from the stdin, by reading one line.
         If modify=True, two lines are used, first line interpreted as the
@@ -223,25 +222,32 @@ class Task(TaskResource):
         but defaults to sys.stdin.
         """
 
-        # TaskWarrior instance is set to None
-        task = cls(None)
-
         # Detect the hook type if not given directly
         name = os.path.basename(sys.argv[0])
         modify = name.startswith('on-modify') if modify is None else modify
 
+        # Create the TaskWarrior instance if none passed
+        if backend is None:
+            backends = importlib.import_module('tasklib.backends')
+            hook_parent_dir = os.path.dirname(os.path.dirname(sys.argv[0]))
+            backend = backends.TaskWarrior(data_location=hook_parent_dir)
+
+        # TaskWarrior instance is set to None
+        task = cls(backend)
+
         # Load the data from the input
         task._load_data(json.loads(input_file.readline().strip()))
 
         # If this is a on-modify event, we are provided with additional
         # line of input, which provides updated data
         if modify:
-            task._update_data(json.loads(input_file.readline().strip()))
+            task._update_data(json.loads(input_file.readline().strip()),
+                              remove_missing=True)
 
         return task
 
-    def __init__(self, warrior, **kwargs):
-        self.warrior = warrior
+    def __init__(self, backend, **kwargs):
+        super(Task, self).__init__(backend)
 
         # Check that user is not able to set read-only value in __init__
         for key in kwargs.keys():
@@ -253,8 +259,12 @@ class Task(TaskResource):
         # __init__ methods, that would be confusing
 
         # Rather unfortunate syntax due to python2.6 comaptiblity
-        self._load_data(dict((key, self._serialize(key, value))
-                        for (key, value) in six.iteritems(kwargs)))
+        self._data = dict((key, self._normalize(key, value))
+                          for (key, value) in six.iteritems(kwargs))
+        self._original_data = copy.deepcopy(self._data)
+
+        # Provide read only access to the original data
+        self.original = ReadOnlyDictView(self._original_data)
 
     def __unicode__(self):
         return self['description']
@@ -267,7 +277,6 @@ class Task(TaskResource):
             # If the tasks are not saved, compare the actual instances
             return id(self) == id(other)
 
-
     def __hash__(self):
         if self['uuid']:
             # For saved Tasks, just define equality by equality of uuids
@@ -276,25 +285,6 @@ class Task(TaskResource):
             # If the tasks are not saved, return hash of instance id
             return id(self).__hash__()
 
-    @property
-    def _modified_fields(self):
-        writable_fields = set(self._data.keys()) - set(self.read_only_fields)
-        for key in writable_fields:
-            new_value = self._data.get(key)
-            old_value = self._original_data.get(key)
-
-            # Make sure not to mark data removal as modified field if the
-            # field originally had some empty value
-            if key in self._data and not new_value and not old_value:
-                continue
-
-            if new_value != old_value:
-                yield key
-
-    @property
-    def modified(self):
-        return bool(list(self._modified_fields))
-
     @property
     def completed(self):
         return self['status'] == six.text_type('completed')
@@ -311,46 +301,23 @@ class Task(TaskResource):
     def pending(self):
         return self['status'] == six.text_type('pending')
 
+    @property
+    def active(self):
+        return self['start'] is not None
+
     @property
     def saved(self):
         return self['uuid'] is not None or self['id'] is not None
 
     def serialize_depends(self, cur_dependencies):
         # Check that all the tasks are saved
-        for task in cur_dependencies:
+        for task in (cur_dependencies or set()):
             if not task.saved:
                 raise Task.NotSaved('Task \'%s\' needs to be saved before '
                                     'it can be set as dependency.' % task)
 
         return super(Task, self).serialize_depends(cur_dependencies)
 
-    def format_depends(self):
-        # We need to generate added and removed dependencies list,
-        # since Taskwarrior does not accept redefining dependencies.
-
-        # This cannot be part of serialize_depends, since we need
-        # to keep a list of all depedencies in the _data dictionary,
-        # not just currently added/removed ones
-
-        old_dependencies = self._original_data.get('depends', set())
-
-        added = self['depends'] - old_dependencies
-        removed = old_dependencies - self['depends']
-
-        # Removed dependencies need to be prefixed with '-'
-        return 'depends:' + ','.join(
-                [t['uuid'] for t in added] +
-                ['-' + t['uuid'] for t in removed]
-            )
-
-    def format_description(self):
-        # 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:
-            return self._data['description']
-        else:
-            return "description:'{0}'".format(self._data['description'] or '')
-
     def delete(self):
         if not self.saved:
             raise Task.NotSaved("Task needs to be saved before it can be deleted")
@@ -361,11 +328,44 @@ class Task(TaskResource):
         if self.deleted:
             raise Task.DeletedTask("Task was already deleted")
 
-        self.warrior.execute_command([self['uuid'], 'delete'])
+        self.backend.delete_task(self)
 
         # Refresh the status again, so that we have updated info stored
+        self.refresh(only_fields=['status', 'start', 'end'])
+
+    def start(self):
+        if not self.saved:
+            raise Task.NotSaved("Task needs to be saved before it can be started")
+
+        # Refresh, and raise exception if task is already completed/deleted
+        self.refresh(only_fields=['status'])
+
+        if self.completed:
+            raise Task.CompletedTask("Cannot start a completed task")
+        elif self.deleted:
+            raise Task.DeletedTask("Deleted task cannot be started")
+        elif self.active:
+            raise Task.ActiveTask("Task is already active")
+
+        self.backend.start_task(self)
+
+        # Refresh the status again, so that we have updated info stored
+        self.refresh(only_fields=['status', 'start'])
+
+    def stop(self):
+        if not self.saved:
+            raise Task.NotSaved("Task needs to be saved before it can be stopped")
+
+        # Refresh, and raise exception if task is already completed/deleted
         self.refresh(only_fields=['status'])
 
+        if not self.active:
+            raise Task.InactiveTask("Cannot stop an inactive task")
+
+        self.backend.stop_task(self)
+
+        # Refresh the status again, so that we have updated info stored
+        self.refresh(only_fields=['status', 'start'])
 
     def done(self):
         if not self.saved:
@@ -379,43 +379,23 @@ class Task(TaskResource):
         elif self.deleted:
             raise Task.DeletedTask("Deleted task cannot be completed")
 
-        self.warrior.execute_command([self['uuid'], 'done'])
+        self.backend.complete_task(self)
 
         # Refresh the status again, so that we have updated info stored
-        self.refresh(only_fields=['status'])
+        self.refresh(only_fields=['status', 'start', 'end'])
 
     def save(self):
         if self.saved and not self.modified:
             return
 
-        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('.'))
-
-        # Refreshing is very important here, as not only modification time
-        # is updated, but arbitrary attribute may have changed due hooks
-        # altering the data before saving
-        self.refresh()
+        # All the actual work is done by the backend
+        self.backend.save_task(self)
 
     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.backend.annotate_task(self, annotation)
         self.refresh(only_fields=['annotations'])
 
     def remove_annotation(self, annotation):
@@ -424,48 +404,17 @@ class Task(TaskResource):
 
         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):
-            # Add the output of format_field method to args list (defaults to
-            # field:value)
-            serialized_value = self._serialize(field, self._data[field]) or ''
-            format_default = lambda: "{0}:{1}".format(
-                field,
-                "'{0}'".format(serialized_value) if serialized_value else ''
-            )
-            format_func = getattr(self, 'format_{0}'.format(field),
-                                  format_default)
-            args.append(format_func())
-
-        # 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
+        self.backend.denotate_task(self, annotation)
+        self.refresh(only_fields=['annotations'])
 
-    def refresh(self, only_fields=[]):
+    def refresh(self, only_fields=None, after_save=False):
         # 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])
+        new_data = self.backend.refresh_task(self, after_save=after_save)
+
         if only_fields:
             to_update = dict(
                 [(k, new_data.get(k)) for k in only_fields])
@@ -473,79 +422,22 @@ class Task(TaskResource):
         else:
             self._load_data(new_data)
 
-    def export_data(self):
-        """
-        Exports current data contained in the Task as JSON
-        """
-
-        # We need to remove spaces for TW-1504, use custom separators
-        data_tuples = ((key, self._serialize(key, value))
-                       for key, value in six.iteritems(self._data))
-
-        # Empty string denotes empty serialized value, we do not want
-        # to pass that to TaskWarrior.
-        data_tuples = filter(lambda t: t[1] is not '', data_tuples)
-        data = dict(data_tuples)
-        return json.dumps(data, separators=(',',':'))
-
-class TaskFilter(SerializingObject):
-    """
-    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('__', '.')
-
-        # Replace the value with empty string, since that is the
-        # convention in TW for empty values
-        attribute_key = key.split('.')[0]
-        value = self._serialize(attribute_key, value)
-
-        # 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:
-            # Surround value with aphostrophes unless it's a empty string
-            value = "'%s'" % value if value else ''
-
-            # We enforce equality match by using 'is' (or 'none') modifier
-            # Without using this syntax, filter fails due to TW-1479
-            modifier = '.is' if value else '.none'
-            key = key + modifier if '.' not in key else key
-
-            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
+    def __init__(self, backend, filter_obj=None):
+        self.backend = backend
         self._result_cache = None
-        self.filter_obj = filter_obj or TaskFilter()
+        self.filter_obj = filter_obj or self.backend.filter_class(backend)
 
     def __deepcopy__(self, memo):
         """
         Deep copy of a QuerySet doesn't populate the cache
         """
-        obj = self.__class__()
+        obj = self.__class__(backend=self.backend)
         for k, v in self.__dict__.items():
             if k in ('_iter', '_result_cache'):
                 obj.__dict__[k] = None
@@ -590,7 +482,7 @@ class TaskQuerySet(object):
         if klass is None:
             klass = self.__class__
         filter_obj = self.filter_obj.clone()
-        c = klass(warrior=self.warrior, filter_obj=filter_obj)
+        c = klass(backend=self.backend, filter_obj=filter_obj)
         c.__dict__.update(kwargs)
         return c
 
@@ -598,7 +490,7 @@ class TaskQuerySet(object):
         """
         Fetch the tasks which match the current filters.
         """
-        return self.warrior.filter_tasks(self.filter_obj)
+        return self.backend.filter_tasks(self.filter_obj)
 
     def all(self):
         """
@@ -639,72 +531,3 @@ class TaskQuerySet(object):
         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 create and not os.path.exists(data_location):
-            os.makedirs(data_location)
-        self.config = {
-            'data.location': os.path.expanduser(data_location),
-            'confirmation': 'no',
-            'dependency.confirmation': 'no', # See TW-1483 or taskrc man page
-        }
-        self.tasks = TaskQuerySet(self)
-        self.version = self._get_version()
-
-    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 _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={}):
-        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 stderr.strip():
-                error_msg = stderr.strip().splitlines()[-1]
-            else:
-                error_msg = stdout.strip()
-            raise TaskWarriorException(error_msg)
-        return stdout.strip().split('\n')
-
-    def filter_tasks(self, filter_obj):
-        args = ['export', '--'] + filter_obj.get_filter_params()
-        tasks = []
-        for line in self.execute_command(args):
-            if line:
-                data = line.strip(',')
-                try:
-                    filtered_task = Task(self)
-                    filtered_task._load_data(json.loads(data))
-                    tasks.append(filtered_task)
-                except ValueError:
-                    raise TaskWarriorException('Invalid JSON: %s' % data)
-        return tasks
-
-    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 undo(self):
-        self.execute_command(['undo'])