From 5e75d377059a78f7bb13d954fa3c1cb4ed653766 Mon Sep 17 00:00:00 2001
From: Zeger-Jan van de Weg <git@zjvandeweg.nl>
Date: Tue, 1 May 2018 10:44:39 +0200
Subject: [PATCH] Use Ruby methods, not Rails' String#first

Gitaly-Ruby is not a Rails application, which made the method not exist
after the vendor. This patch uses direct indexing, which has the same
properties that `#first` has.

Found while working on: https://gitlab.com/gitlab-org/gitaly/merge_requests/699
---
 lib/gitlab/git/raw_diff_change.rb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/gitlab/git/raw_diff_change.rb b/lib/gitlab/git/raw_diff_change.rb
index eb3d8819239..92f6c45ce25 100644
--- a/lib/gitlab/git/raw_diff_change.rb
+++ b/lib/gitlab/git/raw_diff_change.rb
@@ -38,7 +38,9 @@ module Gitlab
       end
 
       def extract_operation
-        case @raw_operation&.first(1)
+        return :unknown unless @raw_operation
+
+        case @raw_operation[0]
         when 'A'
           :added
         when 'C'