Ruby music tree cleaner

clean_music.rb

module MusicCleaner
  class Cleaner
    def initialize(dir, musicfiles = nil)
      @types = musicfiles || ['.mp3', '.ogg', '.flac', '.m4a', '.aac']
      @delete = ['.ini', '.txt', '.nfo', '.db', '.m3u']
      @skip = ['.', '..']
      @dir = dir
    end
    def clean!(dir = nil)
      dir = dir || @dir
      raise IOError, "Directory #{dir} does not exists." unless File.directory? @dir
      return if @skip.include? dir

      musicFiles = 0

      unlink = []
      Dir.new(dir).each do |f|
        next if @skip.include? f
        path = File.join(dir, f)
        if File.directory? path
          clean! path
        else
          if @types.include?(File.extname f)
            musicFiles += 1
          end
          if @delete.include?(File.extname f)
            unlink << path
          end
        end
      end
      delete_files! unlink

      entries = Dir.entries(dir).reject {|f| ['.','..'].include? f}

      if musicFiles == 0 && entries.empty?
        delete_dir! dir
        return
      end

      if musicFiles == 0
        puts "No music in #{dir}"
        puts "Contains:"
        puts "\t#{entries}"
      end
    end
    def delete_files!(files)
      files.each do |f|
        File.unlink f
      end
    end
    def delete_dir!(dir)
      begin
        Dir.unlink(dir)
      rescue SystemCallError => e
        puts "Directory `#{dir}` could not be deleted due to: #{e.message}"
      end
    end
  end
end

Usage:

mc = MusicCleaner::Cleaner.new("/home/me/Music")
mc.clean!

A small library cleaner I wrote to get rid of empty folders (thanks iTunes!)