The following snippet steals the regular C-x C-s to automatically perltidy as well. I added a different definition for perltidy-whole-buffer so that the input point is restored to be somewhere near where it was originally. I also added a check to see if the buffer has been modifed before calling out to perltidy.
(add-to-list 'cperl-mode-hook (lambda () (substitute-key-definition 's
+ave-buffer 'cperl-save-buffer cperl-mode-map global-map)))
(defun cperl-save-buffer (&optional args)
(defun perltidy-buffer ()
(let ((orig-point (point)))
"perltidy -st" nil t shell-command-default-error-buffer)
(goto-char (if (<= orig-point (point-max))
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