quill: fix duplicate subparser in todo.py

wizard-work/quill/todo.py

@@ -67,9 +67,8 @@ def main():
     a.add_argument("task", help="task text")
     sub.add_parser("list", help="show todos")
     sub.add_parser("all", help="show all including done")
-    sub.add_parser("done", help="show done only")
-    d = sub.add_parser("done")
-    d.add_argument("id", type=int, help="todo id to mark done")
+    d = sub.add_parser("done", help="show done only or mark todo done by id")
+    d.add_argument("id", type=int, nargs="?", help="todo id to mark done")
     args = p.parse_args()
     if args.cmd == "add":
         cmd_add(args)
@@ -78,9 +77,10 @@ def main():
     elif args.cmd == "all":
         cmd_list(args)
     elif args.cmd == "done":
-        if hasattr(args, "id"):
+        if args.id is not None:
             cmd_done(args)
         else:
+            args.done_only = True
             cmd_list(args)
     else:
         p.print_help()