tailor parses Ruby files and measures them with some style and static analysis "rulers". Default values for the Rulers are based on a number of style guides in the Ruby community as well as what seems to be common. More on this here http://wiki.github.com/turboladen/tailor. tailor's goal is to help you be consistent with your code, throughout your project, whatever style that may be.
Gemfile gem 'tailor', '~> 1.1.2'
install gem install tailor -v 1.1.2