From 4717ccf84e374fe2d17a04c06425857f9ea5a35e Mon Sep 17 00:00:00 2001
From: Ethan Dalool <git@voussoir.net>
Date: Thu, 30 Jan 2020 12:34:03 -0800
Subject: [PATCH] Fix excise to have no effect if s doesn't contain split
 marks.

---
 brename.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/brename.py b/brename.py
index f889999..bce9cba 100644
--- a/brename.py
+++ b/brename.py
@@ -67,7 +67,9 @@ def excise(s, mark_left, mark_right):
     excise('What a wonderful day [soundtrack].mp3', ' [', ']') ->
     returns 'What a wonderful day.mp3'
     '''
-    return s.split(mark_left)[0] + s.split(mark_right)[-1]
+    if mark_left in s and mark_right in s:
+        return s.split(mark_left)[0] + s.split(mark_right)[-1]
+    return s
 
 def longest_length(li):
     longest = 0