My Folder helper

folder_helper.rb

    def folder_exists!(folder)
      folder = File.expand_path(folder)
      target = ""
      folder.split(File::SEPARATOR).each{ |path|
        target = "/" if target.empty? && path.empty? #Unix environment
        target = File.join(target, path).to_s
        create_folder(target) if path.empty?
      }
      target
    end

    private
    def create_folder(folder)
      Dir.mkdir(folder) if Dir[folder].empty?
    end