change buffer name for chef

gistfile1.el

;;; Chef's cookbooks has too many "default.rb".
;;; This hook is for detecting each "default.rb".

(defun chef-rename-buffer ()
  (let ((fn (buffer-file-name)))
    (and (stringp fn)
         (string-match "/cookbooks/\\(.+\\)" fn)
         (rename-buffer (match-string 1 fn) t))))

(add-hook 'find-file-hook
          'chef-rename-buffer)