mka_extract.rb

input_dir = ARGV[0]

Dir.chdir(input_dir)

mka_files = Dir.glob("*.mka")

mka_files.each do |filename|
  basename = File.basename(filename, ".*")
  unless File.exist?(basename)
    Dir.mkdir(basename)
    system("mkvextract", "tracks", filename, "--cuesheet", "1:#{basename}/#{basename}.flac")
    system("mkvextract", "attachments", filename, "1:#{basename}/cover.jpg")
    system("gsed", "-i", "-e", "s/FILE \"\"/FILE \"#{basename.force_encoding("UTF-8-MAC").encode("UTF-8").gsub(/&/, "\\\\&")}.flac\"/g", "#{basename}/#{basename}.cue")
    cuesheet = File.open("#{basename}/#{basename}.cue")
    genre = cuesheet.grep(/REM GENRE/).first
    if genre
      system("gsed", "-i", "-e", "/REM GENRE/d", "#{basename}/#{basename}.cue")
      system("gsed", "-i", "-e", "2i #{genre.strip}", "#{basename}/#{basename}.cue")
    end

    cuesheet.rewind
    date = cuesheet.grep(/REM DATE/).first
    if date
      system("gsed", "-i", "-e", "/REM DATE/d", "#{basename}/#{basename}.cue")
      system("gsed", "-i", "-e", "2i #{date.strip}", "#{basename}/#{basename}.cue")
    end

    cuesheet.close
  end
end