SerializingObject: Add normalizers for normalizing user input

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

diff --git a/tasklib/task.py b/tasklib/task.py
index d5913af9adda62e66f05bb7931410c94a0000f37..3097f4c07b2d6136778928078e831016b14b6c03 100644 (file)
--- a/tasklib/task.py
+++ b/tasklib/task.py
@@ -5,6 +5,7 @@ import json
 import logging
 import os
 import six
 import logging
 import os
 import six

+import sys

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


@@ -28,6 +29,18 @@ class SerializingObject(object):
     """
     Common ancestor for TaskResource & TaskFilter, since they both
     need to serialize arguments.
     """
     Common ancestor for TaskResource & TaskFilter, since they both
     need to serialize arguments.

+
+    Serializing method should hold the following contract:
+      - any empty value (meaning removal of the attribute)
+        is deserialized into a empty string
+      - None denotes a empty value for any attribute
+
+    Deserializing method should hold the following contract:
+      - None denotes a empty value for any attribute (however,
+        this is here as a safeguard, TaskWarrior currently does
+        not export empty-valued attributes) if the attribute
+        is not iterable (e.g. list or set), in which case
+        a empty iterable should be used.

     """
 
     def _deserialize(self, key, value):
     """
 
     def _deserialize(self, key, value):


@@ -40,9 +53,21 @@ class SerializingObject(object):
                                  lambda x: x if x is not None else '')
         return dehydrate_func(value)
 
                                  lambda x: x if x is not None else '')
         return dehydrate_func(value)
 

+    def _normalize(self, key, value):
+        """
+        Use normalize_<key> methods to normalize user input. Any user
+        input will be normalized at the moment it is used as filter,
+        or entered as a value of Task attribute.
+        """
+
+        normalize_func = getattr(self, 'normalize_{0}'.format(key),
+                                 lambda x: x)
+
+        return normalize_func(value)
+

     def timestamp_serializer(self, date):
         if not date:
     def timestamp_serializer(self, date):
         if not date:

-            return None
+            return ''

         return date.strftime(DATE_FORMAT)
 
     def timestamp_deserializer(self, date_str):
         return date.strftime(DATE_FORMAT)
 
     def timestamp_deserializer(self, date_str):


@@ -86,6 +111,15 @@ class SerializingObject(object):
     def deserialize_wait(self, value):
         return self.timestamp_deserializer(value)
 
     def deserialize_wait(self, value):
         return self.timestamp_deserializer(value)
 

+    def serialize_annotations(self, value):
+        value = value if value is not None else []
+
+        # This may seem weird, but it's correct, we want to export
+        # a list of dicts as serialized value
+        serialized_annotations = [json.loads(annotation.export_data())
+                                  for annotation in value]
+        return serialized_annotations if serialized_annotations else ''
+

     def deserialize_annotations(self, data):
         return [TaskAnnotation(self, d) for d in data] if data else []
 
     def deserialize_annotations(self, data):
         return [TaskAnnotation(self, d) for d in data] if data else []
 


@@ -93,13 +127,14 @@ class SerializingObject(object):
         return ','.join(tags) if tags else ''
 
     def deserialize_tags(self, tags):
         return ','.join(tags) if tags else ''
 
     def deserialize_tags(self, tags):

-        if isinstance(tags, basestring):
+        if isinstance(tags, six.string_types):

             return tags.split(',') if tags else []
         return tags or []
 
             return tags.split(',') if tags else []
         return tags or []
 

-    def serialize_depends(self, cur_dependencies):
+    def serialize_depends(self, value):

         # Return the list of uuids
         # Return the list of uuids

-        return ','.join(task['uuid'] for task in cur_dependencies)
+        value = value if value is not None else set()
+        return ','.join(task['uuid'] for task in value)

 
     def deserialize_depends(self, raw_uuids):
         raw_uuids = raw_uuids or ''  # Convert None to empty string
 
     def deserialize_depends(self, raw_uuids):
         raw_uuids = raw_uuids or ''  # Convert None to empty string


@@ -117,6 +152,19 @@ class TaskResource(SerializingObject):
         # are not propagated.
         self._original_data = copy.deepcopy(self._data)
 
         # are not propagated.
         self._original_data = copy.deepcopy(self._data)
 

+    def _update_data(self, data, update_original=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
+        original_data dict is updated as well.
+        """
+        self._data.update(dict((key, self._deserialize(key, value))
+                               for key, value in data.items()))
+
+        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
     def __getitem__(self, key):
         # This is a workaround to make TaskResource non-iterable
         # over simple index-based iteration


@@ -126,7 +174,10 @@ class TaskResource(SerializingObject):
         except ValueError:
             pass
 
         except ValueError:
             pass
 

-        return self._data.get(key) or self._deserialize(key, None)
+        if key not in self._data:
+            self._data[key] = self._deserialize(key, None)
+
+        return self._data.get(key)

 
     def __setitem__(self, key, value):
         if key in self.read_only_fields:
 
     def __setitem__(self, key, value):
         if key in self.read_only_fields:


@@ -142,6 +193,40 @@ class TaskResource(SerializingObject):
     def __repr__(self):
         return str(self)
 
     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']
 
 class TaskAnnotation(TaskResource):
     read_only_fields = ['entry', 'description']


@@ -156,6 +241,11 @@ class TaskAnnotation(TaskResource):
     def __unicode__(self):
         return self['description']
 
     def __unicode__(self):
         return self['description']
 

+    def __eq__(self, other):
+        # consider 2 annotations equal if they belong to the same task, and
+        # their data dics are the same
+        return self.task == other.task and self._data == other._data
+

     __repr__ = __unicode__
 
 
     __repr__ = __unicode__
 
 


@@ -184,6 +274,40 @@ class Task(TaskResource):
         """
         pass
 
         """
         pass
 

+    @classmethod
+    def from_input(cls, input_file=sys.stdin, modify=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
+        original state of the Task object, and second line as its new,
+        modified value. This is consistent with the TaskWarrior's hook
+        system.
+
+        Object created by this method should not be saved, deleted
+        or refreshed, as t could create a infinite loop. For this
+        reason, TaskWarrior instance is set to None.
+
+        Input_file argument can be used to specify the input file,
+        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
+
+        # 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()))
+
+        return task
+

     def __init__(self, warrior, **kwargs):
         self.warrior = warrior
 
     def __init__(self, warrior, **kwargs):
         self.warrior = warrior
 


@@ -197,8 +321,9 @@ class Task(TaskResource):
         # __init__ methods, that would be confusing
 
         # Rather unfortunate syntax due to python2.6 comaptiblity
         # __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)

 
     def __unicode__(self):
         return self['description']
 
     def __unicode__(self):
         return self['description']


@@ -220,17 +345,6 @@ class Task(TaskResource):
             # If the tasks are not saved, return hash of instance id
             return id(self).__hash__()
 
             # 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:
-            if self._data.get(key) != self._original_data.get(key):
-                yield key
-
-    @property
-    def _is_modified(self):
-        return bool(list(self._modified_fields))
-

     @property
     def completed(self):
         return self['status'] == six.text_type('completed')
     @property
     def completed(self):
         return self['status'] == six.text_type('completed')


@@ -253,7 +367,7 @@ class Task(TaskResource):
 
     def serialize_depends(self, cur_dependencies):
         # Check that all the tasks are saved
 
     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)
             if not task.saved:
                 raise Task.NotSaved('Task \'%s\' needs to be saved before '
                                     'it can be set as dependency.' % task)


@@ -292,7 +406,7 @@ class Task(TaskResource):
             raise Task.NotSaved("Task needs to be saved before it can be deleted")
 
         # Refresh the status, and raise exception if the task is deleted
             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()
+        self.refresh(only_fields=['status'])

 
         if self.deleted:
             raise Task.DeletedTask("Task was already deleted")
 
         if self.deleted:
             raise Task.DeletedTask("Task was already deleted")


@@ -300,7 +414,7 @@ class Task(TaskResource):
         self.warrior.execute_command([self['uuid'], 'delete'])
 
         # Refresh the status again, so that we have updated info stored
         self.warrior.execute_command([self['uuid'], 'delete'])
 
         # Refresh the status again, so that we have updated info stored

-        self.refresh()
+        self.refresh(only_fields=['status'])

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


@@ -308,7 +422,7 @@ class Task(TaskResource):
             raise Task.NotSaved("Task needs to be saved before it can be completed")
 
         # Refresh, and raise exception if task is already completed/deleted
             raise Task.NotSaved("Task needs to be saved before it can be completed")
 
         # Refresh, and raise exception if task is already completed/deleted

-        self.refresh()
+        self.refresh(only_fields=['status'])

 
         if self.completed:
             raise Task.CompletedTask("Cannot complete a completed task")
 
         if self.completed:
             raise Task.CompletedTask("Cannot complete a completed task")


@@ -318,10 +432,10 @@ class Task(TaskResource):
         self.warrior.execute_command([self['uuid'], 'done'])
 
         # Refresh the status again, so that we have updated info stored
         self.warrior.execute_command([self['uuid'], 'done'])
 
         # Refresh the status again, so that we have updated info stored

-        self.refresh()
+        self.refresh(only_fields=['status'])

 
     def save(self):
 
     def save(self):

-        if self.saved and not self._is_modified:
+        if self.saved and not self.modified:

             return
 
         args = [self['uuid'], 'modify'] if self.saved else ['add']
             return
 
         args = [self['uuid'], 'modify'] if self.saved else ['add']


@@ -341,6 +455,9 @@ class Task(TaskResource):
             # Circumvent the ID storage, since ID is considered read-only
             self._data['id'] = int(id_lines[0].split(' ')[2].rstrip('.'))
 
             # 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()
 
     def add_annotation(self, annotation):
         self.refresh()
 
     def add_annotation(self, annotation):


@@ -349,7 +466,7 @@ class Task(TaskResource):
 
         args = [self['uuid'], 'annotate', annotation]
         self.warrior.execute_command(args)
 
         args = [self['uuid'], 'annotate', annotation]
         self.warrior.execute_command(args)

-        self.refresh()
+        self.refresh(only_fields=['annotations'])

 
     def remove_annotation(self, annotation):
         if not self.saved:
 
     def remove_annotation(self, annotation):
         if not self.saved:


@@ -359,7 +476,7 @@ class Task(TaskResource):
             annotation = annotation['description']
         args = [self['uuid'], 'denotate', annotation]
         self.warrior.execute_command(args)
             annotation = annotation['description']
         args = [self['uuid'], 'denotate', annotation]
         self.warrior.execute_command(args)

-        self.refresh()
+        self.refresh(only_fields=['annotations'])

 
     def _get_modified_fields_as_args(self):
         args = []
 
     def _get_modified_fields_as_args(self):
         args = []


@@ -367,10 +484,21 @@ class Task(TaskResource):
         def add_field(field):
             # Add the output of format_field method to args list (defaults to
             # field:value)
         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, serialized_value)
+            serialized_value = self._serialize(field, self._data[field])
+
+            # Empty values should not be enclosed in quotation marks, see
+            # TW-1510
+            if serialized_value is '':
+                escaped_serialized_value = ''
+            else:
+                escaped_serialized_value = "'{0}'".format(serialized_value)
+
+            format_default = lambda: "{0}:{1}".format(field,
+                                                      escaped_serialized_value)
+

             format_func = getattr(self, 'format_{0}'.format(field),
                                   format_default)
             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
             args.append(format_func())
 
         # If we're modifying saved task, simply pass on all modified fields


@@ -386,7 +514,7 @@ class Task(TaskResource):
 
         return args
 
 
         return args
 

-    def refresh(self):
+    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")
         # 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")


@@ -396,8 +524,12 @@ class Task(TaskResource):
         # with using UUID only.
         args = [self['uuid'] or self['id'], 'export']
         new_data = json.loads(self.warrior.execute_command(args)[0])
         # with using UUID only.
         args = [self['uuid'] or self['id'], 'export']
         new_data = json.loads(self.warrior.execute_command(args)[0])

-        self._load_data(new_data)
-
+        if only_fields:
+            to_update = dict(
+                [(k, new_data.get(k)) for k in only_fields])
+            self._update_data(to_update, update_original=True)
+        else:
+            self._load_data(new_data)

 
 class TaskFilter(SerializingObject):
     """
 
 class TaskFilter(SerializingObject):
     """


@@ -560,7 +692,8 @@ class TaskWarrior(object):
         self.config = {
             'data.location': os.path.expanduser(data_location),
             'confirmation': 'no',
         self.config = {
             'data.location': os.path.expanduser(data_location),
             'confirmation': 'no',

-            'dependency.confirmation': 'no', # See TW-1483 or taskrc man page
+            'dependency.confirmation': 'no',  # See TW-1483 or taskrc man page
+            'recurrence.confirmation': 'no',  # Necessary for modifying R tasks

         }
         self.tasks = TaskQuerySet(self)
         self.version = self._get_version()
         }
         self.tasks = TaskQuerySet(self)
         self.version = self._get_version()