Creating a zipfile in ruby with a specific compression level

monkey.rb

level = Zlib::BEST_COMPRESSION  # or Zlib::BEST_SPEED
Zip::ZipOutputStream.open(zip_file) do |zip|
    Dir.glob("**/*") do |filename|
        entry = Zip::ZipEntry.new("", filename)
        entry.gather_fileinfo_from_srcpath(filename)
        zip.put_next_entry(entry, nil, nil, Zip::ZipEntry::DEFLATED, level)
        entry.get_input_stream { |is| IOExtras.copy_stream(zip, is) }
    end
end