http://jstorimer.com/ri.html http://samuelmullen.com/2012/01/up-and-running-with-ruby-interactive-ri/ https://github.com/danchoi/ri.vim
In ~/.gemrc
gem: --no-ri --no-rdoc
to
gem: --no-rdoc
rvm docs generate all
gem rdoc --all --ri --no-rdoc
ri -f ansi Array.sort
alias ri='ri -f ansi'