From 93e87c0217a20dff53dfc576de913620021f83e6 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Mon, 28 Nov 2022 14:50:20 +0900
Subject: Fix the case of multiple trailers

---
 tool/sync_default_gems.rb | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'tool/sync_default_gems.rb')

diff --git a/tool/sync_default_gems.rb b/tool/sync_default_gems.rb
index 98894f52f4..4181b814f3 100755
--- a/tool/sync_default_gems.rb
+++ b/tool/sync_default_gems.rb
@@ -450,8 +450,8 @@ def message_filter(repo, sha, input: ARGF)
   if log and !log.empty?
     log.sub!(/(?<=\n)\n+\z/, '') # drop empty lines at the last
     conv[log]
-    log.sub!(/(?:(\A\s*)|\s*\n)(?=(?i:Co-authored-by:.*)*\Z)/) {
-      $~.begin(1) ? "#{commit_url}\n" : "\n\n#{commit_url}"
+    log.sub!(/(?:(\A\s*)|\s*\n)(?=((?i:Co-authored-by:.*\n)+)?\Z)/) {
+      ($~.begin(1) ? "" : "\n\n") + commit_url + ($~.begin(2) ? "\n" : "")
     }
   else
     log = commit_url
-- 
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