From 8f7fe39c27c18d7ae71839baf563c43e1420a597 Mon Sep 17 00:00:00 2001
From: Stefano Pigozzi <ste.pigozzi@gmail.com>
Date: Tue, 9 Apr 2019 12:17:05 +0200
Subject: [PATCH] Add optional to CommandArgs

---
 royalnet/utils/command.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/royalnet/utils/command.py b/royalnet/utils/command.py
index 6b548d2e..84a26f8e 100644
--- a/royalnet/utils/command.py
+++ b/royalnet/utils/command.py
@@ -43,6 +43,11 @@ class CommandArgs(list):
             raise InvalidInputError("Pattern didn't match")
         return match
 
+    def optional(self, index: int) -> typing.Optional:
+        try:
+            return self[index]
+        except IndexError:
+            return None
 
 class Command:
     """A generic command, called from any source."""