At the risk of being slightly off-topic, I would also share my 2c Emacs tip with you. I've put this hook to call perltidy (pressing F6) in my .emacs:

(defun my-cperl-hook ()
  "What to run when cperl-mode is turned on"
  ;; Function to call perltidy
  (defun perltidy-whole-buffer ()
    "Filter the current buffer through perltidy"
    (interactive)
    (shell-command-on-region
       (point-min) (point-max) "perltidy -st"
       nil 1 shell-command-default-error-buffer
    )
  )
  ;; Bind key

  (define-key cperl-mode-map [f6] 'perltidy-whole-buffer)
)
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The hook has to be added to the correct customisation variable as well:

(custom-set-variables
  ;; custom-set-variables was added by Custom -- don't edit or cut/pas
+te it!
  ;; Your init file should contain only one such instance.
  ;; ...
 '(cperl-mode-hook (quote (my-cperl-hook)))
)
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Of course, s/cperl/perl/g if you don't want to use cperl.