Rename mp3 files for burning to disk (for playing in car stereo)

playlist.rb

path = ‘/path/to/music/folder’

puts "Renaming files..."

Dir.foreach(path) do |item|
    next if item == '.' or item == '..'

    new_name = File.basename(item, ".*")

    # car works better with a-z 0-9 A-Z only
    new_name.gsub!(/[^0-9A-Za-z ]/, '')

    # specifies max length 20 chars
    # doesn't specify if that includes extension, so cut that too
    new_name = new_name[0, 20-4]
    new_name.strip!

    # re-add extension
    new_name = new_name + '.mp3'

    # rename file to use new name
    File.rename(path + '/' + item, path + '/' + new_name)

    puts new_name
end

puts "Renaming complete."