Fix #337 - don't promt for sudo passwd for non-existing directories

core/prelude-core.el

@@ -294,6 +294,8 @@ buffer is not visiting a file."
 (defadvice ido-find-file (after find-file-sudo activate)
   "Find file as root if necessary."
   (unless (or (equal major-mode 'dired-mode)
+              (and (buffer-file-name)
+                   (not (file-exists-p (file-name-directory (buffer-file-name)))))
               (and (buffer-file-name)
                    (file-writable-p buffer-file-name)))
     (find-alternate-file (concat "/sudo:root@localhost:" buffer-file-name))))