Re: Cleaning up and structuring user-emacs-directory

[Yuan Fu]

I think one concern could be that if we change the cache directory, users would 
need to manually move their cache files, or lost their data. That doesn’t has 
to be the case, we can make this new feature opt-in:

(defvar user-cache-directory nil)

(defun expand-cache-name (name)
  (if user-cache-directory
      (expand-file-name name user-cache-directory)
    (expand-file-name user-emacs-directory)))

Then,

(defvar xxx-file (expand-file-name "xxx-file" user-emacs-directory))

Would become

(defvar xxx-file (expand-cache-name "xxx-file”))

This way, existing cache files in .Emacs.d are still valid, and people who want 
a clean .Emacs.d can define user-cache-directory to what ever they want.

Yuan