Make new version script accept multiple versions

new-versions.rb

@@ -0,0 +1,65 @@
+versions = ARGV.fetch(0).split(',').map(&:strip)
+versions.each do |engine_version|
+  engine_input, version = engine_version.split('-', 2)
+
+  if engine_input == 'windows'
+    require_relative 'generate-windows-versions'
+    exit
+  end
+
+  MATCH = case engine_input
+  when 'ruby', 'jruby'
+    /^\d+\.\d+\./
+  when 'truffleruby'
+    /^\d+\./
+  end
+
+  raise unless version[MATCH]
+
+  engines = [engine_input]
+  engines << 'truffleruby+graalvm' if engine_input == 'truffleruby'
+
+  engines.each do |engine|
+    puts engine
+
+    # Update ruby-builder-versions.json
+    file = "#{__dir__}/ruby-builder-versions.json"
+    lines = File.readlines(file, chomp: true)
+
+    from = lines.index { |line| line.include?(%{"#{engine}": [}) }
+    raise "Could not find start of #{engine}" unless from
+    to = from
+    to += 1 until lines[to].include?(']')
+
+    from += 1 # [
+    to -= 2 # head, ]
+
+    puts lines[from..to]
+
+    release_line = lines[from..to].find { |line|
+      v = line[/"([^"]+)"/, 1] and v[MATCH] == version[MATCH]
+    }
+
+    if release_line
+      append = " #{version.inspect},"
+      release_line << append unless release_line.end_with?(append)
+    else
+      lines.insert to+1, "    #{version.inspect},"
+    end
+
+    File.write(file, lines.join("\n") + "\n")
+
+    # Update README.md
+    file = "#{__dir__}/README.md"
+    lines = File.readlines(file)
+    engine_line = lines.find { |line| line.start_with?("| `#{engine}`") }
+    engine_line.sub!(/(.+ (?:-|until)) (\d+(?:\.\d+)+)/) do
+      if Gem::Version.new(version) > Gem::Version.new($2)
+        "#{$1} #{version}"
+      else
+        $&
+      end
+    end
+    File.write(file, lines.join)
+  end
+end