Set date in message to the latest gem date [ci skip]

.github/workflows/bundled_gems.yml

@@ -51,8 +51,9 @@ jobs:
           curl -O -R -z ./$data https://stdgems.org/$data
 
       - name: Update bundled gems list
+        id: bundled_gems
         run: |
-          ruby -i~ tool/update-bundled_gems.rb gems/bundled_gems
+          ruby -i~ tool/update-bundled_gems.rb gems/bundled_gems > $GITHUB_OUTPUT
 
       - name: Maintain updated gems list in NEWS
         run: |
@@ -99,14 +100,15 @@ jobs:
       - name: Commit
         run: |
           git pull --ff-only origin ${GITHUB_REF#refs/heads/}
-          message="Update bundled gems list at "
+          message="Update bundled gems list"
           if [ -z "${gem}" ]; then
-            git commit --message="${message}${GITHUB_SHA:0:30} [ci skip]"
+            git commit --message="${message} at ${GITHUB_SHA:0:30} [ci skip]"
           else
-            git commit --message="${message}${TODAY}"
+            git commit --message="${message} as of ${TODAY}"
           fi
           git push origin ${GITHUB_REF#refs/heads/}
         env:
+          TODAY: ${{ steps.bundled_gems.outputs.latest_date || env.TODAY }}
           EMAIL: svn-admin@ruby-lang.org
           GIT_AUTHOR_NAME: git
           GIT_COMMITTER_NAME: git

tool/update-bundled_gems.rb

@@ -1,6 +1,11 @@
 #!ruby -pla
 BEGIN {
   require 'rubygems'
+  date = nil
+  stdout = $>
+}
+END {
+  stdout.print date.strftime("latest_date=%F") if date
 }
 unless /^[^#]/ !~ (gem = $F[0])
   (gem, src), = Gem::SpecFetcher.fetcher.detect(:latest) {|s|
@@ -13,6 +18,7 @@ unless /^[^#]/ !~ (gem = $F[0])
   else
     uri = $F[2]
   end
+  date = gem.date if !date or gem.date && gem.date > date
   if $F[3]
     if $F[3].include?($F[1])
       $F[3][$F[1]] = gem.version.to_s