emacs gdb auto-center source buffer around current line

gud-auto-center-source-buffer.el

;; references:
;;
;; * https://superuser.com/a/118138
;; * https://superuser.com/a/1680006
;; * http://kousik.blogspot.com/2005/10/highlight-current-line-in-gdbemacs.html
(defadvice gud-display-line (after my-gud-display-line-center activate)
  ;; true-file is an argument to the original function
  (let* ((buffer (gud-find-file true-file)))
    (save-excursion
      (with-selected-window (get-buffer-window buffer)
        (save-restriction
          ;; line is an argument to the original function
          (goto-line line)
          (recenter))))))