From be43ad37b7fe7dbeaec653c4ec3dfcf5999e2824 Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@gmail.com>
Date: Thu, 11 Dec 2025 17:57:37 -0800
Subject: [PATCH] release.yml: Fix tag conversion for Ruby 4.0

and PREVIOUS_RELEASE_TAG for any .0 releases
---
 .github/workflows/release.yml |  4 ++--
 tool/ruby-version.rb          | 15 +++++++++++++++
 2 files changed, 17 insertions(+), 2 deletions(-)
 mode change 100644 => 100755 tool/ruby-version.rb

diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 03227bcd723..3caeee9a3b8 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -49,9 +49,9 @@ jobs:
 
       - name: Create a release on GitHub
         run: |
-          RELEASE_TAG=$(echo v${{ env.RUBY_VERSION }} | sed 's/\./_/g')
+          RELEASE_TAG=$(ruby tool/ruby-version.rb tag "${{ env.RUBY_VERSION }}")
           echo $RELEASE_TAG
-          PREVIOUS_RELEASE_TAG=$(echo $RELEASE_TAG | awk 'BEGIN {FS="_"; OFS="_"}{ $NF=$NF-1; print }')
+          PREVIOUS_RELEASE_TAG=$(ruby tool/ruby-version.rb previous-tag "${{ env.RUBY_VERSION }}")
           echo $PREVIOUS_RELEASE_TAG
           tool/gen-github-release.rb $PREVIOUS_RELEASE_TAG $RELEASE_TAG --no-dry-run
         env:
diff --git a/tool/ruby-version.rb b/tool/ruby-version.rb
old mode 100644
new mode 100755
index aaaa345e75b..3bbec576e13
--- a/tool/ruby-version.rb
+++ b/tool/ruby-version.rb
@@ -1,3 +1,5 @@
+#!/usr/bin/env ruby
+
 module RubyVersion
   def self.tag(version)
     major_version = Integer(version.split('.', 2)[0])
@@ -35,3 +37,16 @@ module RubyVersion
     end
   end
 end
+
+if __FILE__ == $0
+  case ARGV[0]
+  when "tag"
+    print RubyVersion.tag(ARGV[1])
+  when "previous"
+    print RubyVersion.previous(ARGV[1])
+  when "previous-tag"
+    print RubyVersion.tag(RubyVersion.previous(ARGV[1]))
+  else
+    "#{$0}: unexpected command #{ARGV[0].inspect}"
+  end
+end