** This question was posted to the emacs stackexchange. 1 Clojure files should open in Clojure-mode. I also have Clojure files that contain color info and are used to generate my styles; they live under a /styles path. For these files, I want them to have both clojure-mode (a major mode) and rainbow-mode (a minor mode). I can implement this on a file-by-file basis be starting such files with a line like this: