Add a simple template for Rails 8.0

Author: headius

files/rails/8.0.rb

@@ -0,0 +1,22 @@
+# JRuby template for `rails new --template ...`
+
+# 1. We let Rails generate the default Gemfile first.
+# 2. We use an after_bundle block or direct manipulation to swap it before bundling completes.
+
+# Replace database driver gem with activerecord-jbdbc-adapter
+case options[:database]
+when "sqlite3"
+  gsub_file "Gemfile", /gem "sqlite3".*$/, 'gem "activerecord-jdbcsqlite3-adapter", "80.0.pre1"'
+when "mysql"
+  gsub_file "Gemfile", /gem "mysql2".*$/, 'gem "activerecord-jdbcmysql-adapter", "80.0.pre1"'
+when "postgresql"
+  gsub_file "Gemfile", /gem "pg".*$/, 'gem "activerecord-jdbcpostgresql-adapter", "80.0.pre1"'
+else
+  say "Unsupported database: #{options[:database]}", :red
+  exit 1
+end
+
+after_bundle do
+  say "Gemfile customized for JDBC and dependencies bundled successfully!", :green
+end
+