guile-zenity/examples/egg-timer.scm

(use-modules (zenity))

(let* ((length (or (zenity-list "What would you like to time?"
                                '("Time" "Operation")
                                '(("10s" "Count to ten..")
                                  ("5m" "Soft boiled egg")
                                  ("8m" "Hard boiled egg")
                                  ("45m" "Baked potato"))
                                #:height 250)
                   (exit)))
       (seconds (case (string->symbol (car length))
                  ((10s) 10)
                  ((5m) (* 5 60))
                  ((8m) (* 8 60))
                  ((45m) (* 45 60))
                  (else (error "Could not understand the time command"))))
       (progress (zenity-progress "Timing.." #:auto-close #t)))
  (let loop ((remaining seconds))
    (progress (round (* 100 (/ (- seconds remaining) seconds))))
    (sleep 1)
    (unless (<= remaining 0)
      (loop (- remaining 1))))
  (zenity-info "Done!"))