Is there Ruby code convention metric tool?

I have been found some ruby code convention metric tool, but cannot
yet.

rails_best_practice(GitHub - flyerhzm/rails_best_practices: a code metric tool for rails projects)
is near by my needs, but not enough. That is for rails not ruby.

I’ll use that tool for

  • set ruby covention standards for my developer team.
  • check convention metric our ruby code in our hudson.
  • and improve code.

Would you recommend any tools for me?
thanks.