guile-examples/gui/g-golf/example-01-hello-world.sh

#! /bin/sh
# -*- mode: scheme; coding: utf-8 -*-
exec guile -e main -s "$0" "$@"
!#

;;; Example adapted from https://www.gnu.org/software/g-golf/manual/html_node/Scripting.html

(eval-when (expand load eval)
  (import (oop goops))

  (default-duplicate-binding-handler
    '(merge-generics replace warn-override-core warn last))

  (import (g-golf))

  (for-each (λ (name) (gi-import-by-name "Gtk" name))
            '("Application"
              "ApplicationWindow"
              "Box"
              "Label"
              "Button")))


(define (activate app)
  (let ((window (make <gtk-application-window>
                  #:title "Hello"
                  #:default-width 320
                  #:default-height 240
                  #:application app))
        (box    (make <gtk-box>
                  #:margin-top 6
                  #:margin-start 12
                  #:margin-bottom 6
                  #:margin-end 6
                  #:orientation 'vertical))
        (label  (make <gtk-label>
                  #:label "Hello, World!"
                  #:hexpand #t
                  #:vexpand #t))
        (button (make <gtk-button>
                  #:label "Close")))

    (connect button
         'clicked
         (lambda (b)
               (close window)))

    (set-child window box)
    (append box label)
    (append box button)
    (show window)))


(define (main args)
  (let ((app (make <gtk-application>
               #:application-id "org.gtk.example")))
    (connect app 'activate activate)
    (let ((status (run app 0 '())))
      (exit status))))