Cacher is the code snippet organizer for pro developers

(eval-after-load "hideshow"
  '(add-to-list 'hs-special-modes-alist
                 `(ruby-mode
                   ,(rx (or "def" "class" "module" "{" "[")) ; Block start
                   ,(rx (or "}" "]" "end"))                  ; Block end
                   ,(rx (or "#" "=begin"))                   ; Comment start
                   ruby-forward-sexp nil)))