gistfile1.txt

class File
  class Fingerprint
    attr_reader :inode
    
    def initialize(path)
      @path = path
      @inode = File.stat(@path).ino rescue nil
    end

    def ==(other)
      return false if self.inode.nil? || other.inode.nil?
      self.inode == other.inode || self.md5 == other.md5
    end

    def md5
      @md5 ||= Digest::MD5.hexdigest File.read(@path)
    end

    def inspect
      "<#{@path}: #{inode}/#{@md5 || 'outstanding md5...'}"
    end
  end
  
  def self.fingerprint(path)
    Fingerprint.new path
  end
end

module Enumerable
  def unique?(&block)
    first_loop = true
    
    each do |entry|
      if first_loop
        value = yield(entry) 
        first_loop = false
      else
        return false if value != yield(entry)
      end
    end

    true
  end
end