unify_gem.rb

#!/usr/bin/env ruby
#-*- coding: utf-8 -*-
#
# unify dupulicated gem files.
#
# This work is in the public domain.
#

require 'digest/md5'


h = {}
Dir.glob("#{ENV['HOME']}/.rvm/gems/**/*.gem").each do |file|
  md5 = Digest::MD5.file(file).to_s
  if h[md5]
    unless FileTest.identical? h[md5], file
      File.unlink file
      puts "link #{h[md5]} => #{file}"
      File.link h[md5], file
    end
  else
    h[md5] = file
  end
end