Task: Make sure empty values are not passed to TW via hooks

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

diff --git a/tasklib/task.py b/tasklib/task.py
index ec3de29dc28f4c8887b14721c468c861b15a893a..0b18a14a5d1bcdbe1f77cc58344a1695e1fa79a8 100644 (file)
--- a/tasklib/task.py
+++ b/tasklib/task.py
@@ -207,7 +207,7 @@ class Task(TaskResource):
         pass
 
     @classmethod
-    def from_input(cls, input_file=sys.stdin, modify=False):
+    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
@@ -226,6 +226,10 @@ class Task(TaskResource):
         # 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()))
 
@@ -467,7 +471,14 @@ class Task(TaskResource):
         """
 
         # We need to remove spaces for TW-1504, use custom separators
-        return json.dumps(self._data, 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):
     """