savehist for emacs

; savehist setup from ryan b.

(require 'savehist)
(savehist-mode 1)
(custom-set-variables
'(savehist-length nil)
'(savehist-history-variables
(cons 'gud-gdb-history savehist-history-variables)))

(custom-set-variables
'(history-length t)
'(history-delete-duplicates t)
)

; save history and desktop periodically in case emacs crashes.
(run-with-timer 300 300
                (lambda () (desktop-save-in-desktop-dir)
                  (savehist-save)))