Get mp3info from a fold use ruby

test.rb

require 'mp3info'

dir = File.expand_path("../", __FILE__)
Dir["#{dir}/*"].each do |sub_dir|
  if File.directory?(sub_dir)
    Dir.entries(sub_dir).each do |file|
      if file =~ /mp3/
        title = file.split("-").last.sub(/.mp3/, "")
        artist = file.scan(/_(\w+)/).flatten.first
        Mp3Info.open( sub_dir + "/" + file ) do |mp3|
          mp3.tag.title = title
          mp3.tag.artist = artist
        end
      end
    end
  end

end