play.rb

#!/usr/bin/ruby

AUDIO_EXTENSIONS = 
  Hash[*
        "flac ogg mp3 wav ape".
          split.
          map { |f| ['.'+f,true] }.
          flatten
      ]

search = ARGV.join('\ ')

songs = `locate #{search}`.split("\n")

albums = {}

songs.each { |s| 
  if AUDIO_EXTENSIONS[File.extname(s)]
    d = File.dirname(s)
    albums[d] ||= 0
    albums[d] += 1
  end
}

albums.reject! { |a, songs| songs < 3 }

albums = albums.keys

path = albums[(rand*albums.length).floor].
  gsub(/ /, "\\ ").
  gsub(/\(/, "\\(").
  gsub(/\)/, "\\)").
  gsub(/\[/, "\\[").
  gsub(/\]/, "\\]")

exec "mplayer #{path}/*"