I've been looking at whitespace-mode, but I'm not sure it can do what I want here. Here is an example:
(defn foo  ..(let [x 1] ....(+ x 2)))
How can I do something like that in Emacs? In words, I'd like it to only visualize the leading (indentation) whitespace, but not all spaces in general. Just the spaces at the beginning of the lines.