https://git.ruby-lang.org/ruby.git/commit/?id=b6d7e98f25

From b6d7e98f2540500f072c5cc0f136cae69f80055c Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 4 Nov 2022 15:18:36 +0900
Subject: sync_default_gems.rb: fix the position to insert the original URL

Since the regexp had expected an empty line before `Co-Authored-By:`
trailer lines, it failed to match when the body has the trailer only.
---
 tool/sync_default_gems.rb | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tool/sync_default_gems.rb b/tool/sync_default_gems.rb
index d6b20a82bf..80eabab81c 100755
--- a/tool/sync_default_gems.rb
+++ b/tool/sync_default_gems.rb
@@ -441,9 +441,10 @@ def message_filter(repo, sha, input: ARGF) https://github.com/ruby/ruby/blob/trunk/tool/sync_default_gems.rb#L441
   end
   url = "#{url}/commit/#{sha[0,10]}\n"
   if log and !log.empty?
+    log.sub!(/(?<=\n)\n+\z/, '') # drop empty lines at the last
     conv[log]
-    log.sub!(/\s*(?=(?i:\nCo-authored-by:.*)*\Z)/) {
-      "\n\n#{url}"
+    log.sub!(/(?:(\A\s*)|\s*\n)(?=(?i:Co-authored-by:.*)*\Z)/) {
+      $~.begin(0) ? "#{url}\n" : "\n\n#{url}"
     }
   else
     log = url
-- 
cgit v1.2.3


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