Task: Autmoatically detect TaskWarrior instance in from_input

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

diff --git a/tasklib/task.py b/tasklib/task.py
index 17af8d4977eaaea69f99e2b7608b53b2851e0cbc..50384bfbd2805aa04362b0868d94fd9905937d0c 100644 (file)
--- a/tasklib/task.py
+++ b/tasklib/task.py
@@ -52,9 +52,6 @@ class ReadOnlyDictView(object):
     def get(self, key, default=None):
         return copy.deepcopy(self.viewed_dict.get(key, default))
 
-    def has_key(self, key):
-        return self.viewed_dict.has_key(key)
-
     def items(self):
         return [copy.deepcopy(v) for v in self.viewed_dict.items()]
 
@@ -78,6 +75,15 @@ class SerializingObject(object):
         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.
+
+    Normalizing methods should hold the following contract:
+      - They are used to validate and normalize the user input.
+        Any attribute value that comes from the user (during Task
+        initialization, assignign values to Task attributes, or
+        filtering by user-provided values of attributes) is first
+        validated and normalized using the normalize_{key} method.
+      - If validation or normalization fails, normalizer is expected
+        to raise ValueError.
     """
 
     def _deserialize(self, key, value):
@@ -97,6 +103,10 @@ class SerializingObject(object):
         or entered as a value of Task attribute.
         """
 
+        # None value should not be converted by normalizer
+        if value is None:
+            return None
+
         normalize_func = getattr(self, 'normalize_{0}'.format(key),
                                  lambda x: x)
 
@@ -227,13 +237,14 @@ class SerializingObject(object):
             # If the value is already localized, there is no need to change
             # time zone at this point. Also None is a valid value too.
             localized = value
-        
+
         return localized
 
     def normalize_uuid(self, value):
         # Enforce sane UUID
-        if not isinstance(value, six.text_type) or value == '':
-            raise ValueError("UUID must be a valid non-empty string.")
+        if not isinstance(value, six.string_types) or value == '':
+            raise ValueError("UUID must be a valid non-empty string, "
+                             "not: {}".format(value))
 
         return value
 
@@ -374,7 +385,7 @@ 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, warrior=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
@@ -390,13 +401,18 @@ 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 warrior is None:
+            hook_parent_dir = os.path.dirname(os.path.dirname(sys.argv[0]))
+            warrior = TaskWarrior(data_location=hook_parent_dir)
+
+        # TaskWarrior instance is set to None
+        task = cls(warrior)
+
         # Load the data from the input
         task._load_data(json.loads(input_file.readline().strip()))