X-Git-Url: https://git.madduck.net/etc/taskwarrior.git/blobdiff_plain/bd3efb6ceee683f9575fb40c4ec9cf730e894939..4c0d71c0c2a8b190249416b29b310f4afcab755b:/tasklib/task.py

diff --git a/tasklib/task.py b/tasklib/task.py
index 096f656..5acabe0 100644
--- a/tasklib/task.py
+++ b/tasklib/task.py
@@ -122,10 +122,21 @@ class Task(TaskResource):
         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):
@@ -154,6 +165,8 @@ 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):
@@ -161,6 +174,41 @@ class Task(TaskResource):
             return None
         return datetime.datetime.strptime(date_str, DATE_FORMAT)
 
+    def serialize_depends(self, cur_dependencies):
+        # Check that all the tasks are saved
+        for task in cur_dependencies:
+            if not task.saved:
+                raise Task.NotSaved('Task \'%s\' needs to be saved before '
+                                    'it can be set as dependency.' % task)
+
+        # Return the list of uuids
+        return ','.join(task['uuid'] for task in cur_dependencies)
+
+    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 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_raw = self._original_data.get('depends','')
+        old_dependencies = self.deserialize_depends(old_dependencies_raw)
+
+        added = self['depends'] - old_dependencies
+        removed = old_dependencies - self['depends']
+
+        # Removed dependencies need to be prefixed with '-'
+        return ','.join(
+                [t['uuid'] for t in added] +
+                ['-' + t['uuid'] for t in removed]
+            )
+
     def deserialize_annotations(self, data):
         return [TaskAnnotation(self, d) for d in data] if data else []
 
@@ -253,8 +301,11 @@ class Task(TaskResource):
             # task description if description: prefix is used
             if self.warrior.version < VERSION_2_4_0 and field == 'description':
                 args.append(self._data[field])
+            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: