compare.rb

require 'pathname'

class Pathname
  def hashes
    children.map do |entry|
      if entry.directory?
        sha1 = [Digest::SHA1.hexdigest(entry.hashes.sort.join("")), entry]
      else
        sha1 = [Digest::SHA1.hexdigest(entry.read), entry]
      end
      sha1
    end
  end
  
  def directories
    results = []
    children.map do |entry|
      if entry.directory?
        results << entry.directories.map {|d| d}
        results << entry
      end
    end
    results.flatten 
  end
end

duplicates = []
dirs = Pathname.new(ARGV.first).directories
until dirs.empty?
  dir = dirs.shift
  dirs.each do |comp|
    puts "diff -r #{dir} #{comp}"
    result = `diff -r #{dir} #{comp}`
    if result.empty?
      duplicates << [dir, comp]
    end
  end
end

duplicates.each do |dupl|
  puts dupl
end