+(defun ff-buffer-file-name (&optional buf)
+ "Like `buffer-file-name' but works with indirect buffers as well.
+If BUF is nil, uses the current buffer."
+ (unless buf
+ (setq buf (current-buffer)))
+ (or (buffer-file-name buf)
+ (when (buffer-base-buffer buf)
+ (buffer-file-name (buffer-base-buffer buf)))))
+