X-Git-Url: https://plomlompom.com/repos/?a=blobdiff_plain;f=plomtask%2Ftodos.py;h=8fa3b91407cbaef08e599faca708d7ffe9b5c8a0;hb=a0fc8b9ddabe3af5b2cc0592513ba3e69d5fd9d4;hp=43ada0b6a04f3df387c1f1933356e1e2b1832fbc;hpb=aed1d5968abf97976db3725347fe4e7672c935e7;p=plomtask

diff --git a/plomtask/todos.py b/plomtask/todos.py
index 43ada0b..8fa3b91 100644
--- a/plomtask/todos.py
+++ b/plomtask/todos.py
@@ -15,7 +15,7 @@ class Todo:
                  is_done: bool, day: Day) -> None:
         self.id_ = id_
         self.process = process
-        self.is_done = is_done
+        self._is_done = is_done
         self.day = day
         self.children: list[Todo] = []
         self.parents: list[Todo] = []
@@ -69,6 +69,17 @@ class Todo:
                 return False
         return True
 
+    @property
+    def is_done(self) -> bool:
+        """Wrapper around self._is_done so we can control its setter."""
+        return self._is_done
+
+    @is_done.setter
+    def is_done(self, value: bool) -> None:
+        if value != self.is_done and not self.is_doable:
+            raise BadFormatException('cannot change doneness of undoable Todo')
+        self._is_done = value
+
     def add_child(self, child: Todo) -> None:
         """Add child to self.children, guard against recursion"""
         def walk_steps(node: Todo) -> None: