From aa969e72a34cc3d6e39495a4210442a5e9c7952c Mon Sep 17 00:00:00 2001
From: Ekaitz Zarraga <ekaitz@elenq.tech>
Date: Fri, 4 Nov 2022 23:08:52 +0100
Subject: Recursive state rotation using macro magic

---
 depre/main.scm | 35 ++++++++++++++++++++++++++++++-----
 1 file changed, 30 insertions(+), 5 deletions(-)

diff --git a/depre/main.scm b/depre/main.scm
index 81bdb03..11b18fc 100644
--- a/depre/main.scm
+++ b/depre/main.scm
@@ -25,6 +25,18 @@
         ((car fs))
         (loop (cdr fs))))))
 
+;; Transition by chance, according to the state
+;; Example:
+;; - You are too tired for that, so you do this instead
+;; - Or you actually do it
+(define (f-or-tired f tired)
+  #f
+  )
+
+(define (f-or-depressed f depressed)
+  #f
+  )
+
 ;; Simple I/O
 (define (answer message)
   (lambda ()
@@ -71,16 +83,29 @@
           (loop (read)))))))
 
 ;; States:
-(define start
+
+;; Some macro magic for indirection that enables recursion.
+;; I don't really know how it works (yet!)
+(define %states (make-hash-table))
+(define-macro (register-state name f)
+  `(hash-set! %states ,name ,f))
+(define-macro (to-state name)
+  `(lambda () ((hash-ref %states ,name))))
+
+(register-state
+  'begining
+  (state "This is the game beginning, as a test"
+         (list (cons "Return to start" (to-state 'start)))))
+
+(register-state
+  'start
   (state "Hi, game starts"
          (list (cons "Start game"
                      (combine
                        (answer "Let's start, then.")
-                       (state "heading"
-                              (list (cons "hola"  (lambda () (display "HOLA")))
-                                    (cons "adios" (lambda () (display "adios")))))))
+                       (to-state 'begining)))
                (cons "Quit game"
                      (answer "Good bye!")))
          #:hide-status))
 
-(start)
+((to-state 'start))
-- 
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