Mark completed items with a 'x' in the column UI

topydo/ui/columns/TodoWidget.py

@@ -58,6 +58,10 @@ class TodoWidget(urwid.WidgetWrap):
         self.todo = p_todo
 
         todo_text = TEXT_FORMATTER.parse(p_todo)
+
+        if p_todo.is_completed():
+            priority_text = ' x '
+        else:
             priority_text = PRIO_FORMATTER.parse(p_todo)
 
         # split todo_text at each occurrence of tag/project/context/url