Experimenting With Spritely Goblins

• The Spring Lisp Game Jam starts next week! May 9th - May 19th

  https://itch.io/jam/spring-lisp-game-jam-2025

  I’ll be working on some kind of web-based MUD with Guile and possibly Goblins.

Today we’re going to experiment with Spritely Goblins to learn how it works and see if it would be appropriate to use for a MUD game project that I’m planning to build for the upcoming Spring Lisp Game Jam!

Resources:

• https://spritely.institute/goblins/
• https://files.spritely.institute/docs/guile-goblins/0.15.1/index.html

Check out using Goblins with Guile Hoot:

• https://spritely.institute/news/spritely-goblins-v0-15-1-released.html
• https://files.spritely.institute/embeds/goblin-chat-lite/goblin-chat-lite.scm

Here’s the example code we experimented with. We spent most of the time walking through the Goblins manual!

(use-modules (goblins)
             (goblins vat)
             (fibers)
             (fibers conditions)
             (system repl server))

(define-actor (^sleeper _bcom)
  (lambda ()
    (define sleep-vow
      (spawn-fibrous-vow (lambda () (sleep 3) #t)))
    (on sleep-vow
        (lambda _
          'awake)
        #:promise? #t)))

(define-actor (^hello _bcom)
  (lambda ()
    'hello))

(define a-vat (spawn-vat))
(define sleeper
  (with-vat a-vat
    (spawn ^sleeper)))
(define hello
  (with-vat a-vat
    (spawn ^hello)))

(define b-vat (spawn-vat))
(with-vat b-vat
  (on (<- sleeper)
      (lambda (response)
        (pk 'sleeper-said response)))
  (on (<- hello)
      (lambda (response)
        (pk 'hello-said response))))

;; Start a REPL, use `geiser-connect' to enter it!
(run-server)