http://qiita.com/items/2b5b0303f5a7aa69392a
.emacsに以下を追記
(defun coffee-custom () "coffee-mode-hook" (and (set (make-local-variable 'tab-width) 2) (set (make-local-variable 'coffee-tab-width) 2)) ) (add-hook 'coffee-mode-hook '(lambda() (coffee-custom)))