Task: Enumarate only writable fields as modified

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

diff --git a/tasklib/task.py b/tasklib/task.py
index 8fe1e1b47df278c8d58e8692a266dbc3215ac6c1..c9fafa667f2376103cdc774f8189c27e23ce74d6 100644 (file)
--- a/tasklib/task.py
+++ b/tasklib/task.py
@@ -42,16 +42,22 @@ class TaskResource(object):
         except ValueError:
             pass
 
-        hydrate_func = getattr(self, 'deserialize_{0}'.format(key),
-                               lambda x: x)
-        return hydrate_func(self._data.get(key))
+        return self._deserialize(key, self._data.get(key))
 
     def __setitem__(self, key, value):
         if key in self.read_only_fields:
             raise RuntimeError('Field \'%s\' is read-only' % key)
+        self._data[key] = self._serialize(key, value)
+
+    def _deserialize(self, key, value):
+        hydrate_func = getattr(self, 'deserialize_{0}'.format(key),
+                               lambda x: x)
+        return hydrate_func(value)
+
+    def _serialize(self, key, value):
         dehydrate_func = getattr(self, 'serialize_{0}'.format(key),
                                  lambda x: x)
-        self._data[key] = dehydrate_func(value)
+        return dehydrate_func(value)
 
     def __str__(self):
         s = six.text_type(self.__unicode__())
@@ -113,23 +119,42 @@ class Task(TaskResource):
     def __init__(self, warrior, data={}, **kwargs):
         self.warrior = warrior
 
-        # We keep data for backwards compatibility
-        kwargs.update(data)
+        # We serialize the data in kwargs so that users of the library
+        # do not have to pass different data formats via __setitem__ and
+        # __init__ methods, that would be confusing
 
-        self._load_data(kwargs)
+        # Rather unfortunate syntax due to python2.6 comaptiblity
+        self._load_data(dict((key, self._serialize(key, value))
+                        for (key, value) in six.iteritems(kwargs)))
+
+        # We keep data for backwards compatibility
+        # TODO: Should we keep this using unserialized access to _data dict?
+        self._data.update(data)
 
     def __unicode__(self):
         return self['description']
 
     def __eq__(self, other):
-        return self['uuid'] == other['uuid']
+        if self['uuid'] and other['uuid']:
+            # For saved Tasks, just define equality by equality of uuids
+            return self['uuid'] == other['uuid']
+        else:
+            # If the tasks are not saved, compare the actual instances
+            return id(self) == id(other)
+
 
     def __hash__(self):
-        return self['uuid'].__hash__()
+        if self['uuid']:
+            # For saved Tasks, just define equality by equality of uuids
+            return self['uuid'].__hash__()
+        else:
+            # If the tasks are not saved, return hash of instance id
+            return id(self).__hash__()
 
     @property
     def _modified_fields(self):
-        for key in self._data.keys():
+        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
 
@@ -154,6 +179,8 @@ class Task(TaskResource):
         return self['uuid'] is not None or self['id'] is not None
 
     def serialize_due(self, date):
+        if not date:
+            return None
         return date.strftime(DATE_FORMAT)
 
     def deserialize_due(self, date_str):
@@ -291,7 +318,8 @@ class Task(TaskResource):
             elif field == 'depends':
                 args.append('{0}:{1}'.format(field, self.format_depends()))
             else:
-                args.append('{0}:{1}'.format(field, self._data[field]))
+                # Use empty string to substitute for None value
+                args.append('{0}:{1}'.format(field, self._data[field] or ''))
 
         # If we're modifying saved task, simply pass on all modified fields
         if self.saved: