rename-abcde.rb

#!/usr/bin/env ruby

# foo_bar-qwe_asd/01.name.flac

require 'fileutils'

start_dir = Dir.pwd

ARGV.select do |arg|
  # is a directory
  isDir = File.directory? arg
  # has a dash in it
  hasDash = arg.include? '-'
  # could even check if it contains flac files
  #

  isDir && hasDash
end.each do |dir|
  # [ "artist name", "album name" ]
  names = dir.split('-').map { |dirpart| dirpart.sub(/_/, ' ') }
  artist = names[0]
  album = names[1]
  # does artist dir exist?
  Dir.mkdir(artist) unless File.directory?(artist)
  puts "moving #{album} into #{artist}"
  dest_dir = "#{artist}/#{album}"
  FileUtils.mv dir, dest_dir

  Dir.chdir dest_dir

  Dir.glob('*.flac').each do |file|
    new_name = file.sub(/^(\d+)\./, '\1 - ')
    puts "renaming #{file} to #{new_name}"
    FileUtils.mv file, new_name
  end

end