just gimme a damn uuid

just-gimme-a-damn-uuid.rb

    {                                                                                                                                                                          
      'ffi-uuid' => proc{|*args| FFI::UUID.generate_time.to_s},                                                                                                                
      'uuid' => proc{|*args| UUID.generate.to_s},                                                                                                                              
      'uuidtools' => proc{|*args| UUIDTools::UUID.timestamp_create.to_s}                                                                                                       
    }.each do |lib, implementation|                                                                                                                                            
      begin                                                                                                                                                                    
        require(lib)                                                                                                                                                           
        define_method(:uuid, &implementation)                                                                                                                                  
        break                                                                                                                                                                  
      rescue LoadError                                                                                                                                                         
        nil                                                                                                                                                                    
      end                                                                                                                                                                      
    end                                                                                                                                                                        
    abort 'no suitable uuid generation library detected' unless method_defined?(:uuid)