1 files changed, 205 insertions, 0 deletions

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+#!/bin/sh
+#| -*- scheme -*-
+exec csi -R r7rs -ss "$0" "$@"
+game
+|#
+
+(import (scheme base)
+        (scheme write)
+        (chicken io)
+        (chicken port)
+        (yolk common)
+        (yolk xterm)
+        (yolk erase)
+        (yolk cursor)
+        (matchable)
+        (stty))
+
+(define (log . xs)
+  (with-output-to-port (current-error-port)
+    (lambda ()
+      (for-each (lambda (x) (display x) (display " ") x)
+                xs)
+      (newline))))
+
+(define (main args)
+  (parameterize ((world (make-world 80 25)))
+    (dynamic-wind game-setup
+                  game-loop
+                  game-cleanup))
+  #t)
+
+(define (game-setup)
+  ;; Prepare terminal
+  (stty '(raw (not echo)))
+  (set-buffering-mode! (current-input-port) #:none 1)
+  (set-buffering-mode! (current-output-port) #:none 1)
+  (draw alt-buffer-enable
+        erase-screen
+        (cursor-save)
+        invisible-cursor)
+  ;; Set up world
+  (world-init (world))
+  (world-draw (world)))
+
+(define (game-cleanup)
+  ;; Restore terminal
+  (stty '(cooked echo))
+  (draw cursor-home
+        (cursor-restore)
+        alt-buffer-disable
+        visible-cursor))
+
+(define (game-loop)
+  (let loop ((c (readch)))
+    (if (eq? c 'done)
+        #t
+        (let ((done? #f))
+          (match c
+            ((or #\q #\)
+             (set! done? #t))
+            ;; Escape characters
+            (#\escape
+             (match (readch)
+               (#\[ (match (readch)
+                      (#\A (up!))
+                      (#\B (down!))
+                      (#\C (right!))
+                      (#\D (left!))
+                      (else)))
+               (else)))
+            (else))
+          (world-draw (world))
+          (loop (if done? 'done (readch)))))))
+
+(define (readch)
+  (let ((c (integer->char (read-byte))))
+    c))
+
+(define (draw . instructions)
+  (for-each (lambda (i)
+              (cond
+               ((string? i) (display i))
+               ((list? i) (apply draw i))
+               (else (error "Don't know how to draw" i))))
+            instructions))
+
+(define-record-type world
+  (%make-world width height map)
+  world?
+  (width world-width world-width-set!)
+  (height world-height world-height-set!)
+  (map world-map world-map-set!))
+
+(define (in-bounds? world x y)
+  (or (< x (world-width world))
+      (> x 0)
+      (< y (world-height world))
+      (> y 0)))
+
+(define (coords->index world x y)
+  (if (in-bounds? world x y)
+      (+ x (* (world-width world) y))
+      (error "Out of bounds"
+             (list (world-width world) (world-height world))
+             (list x y))))
+
+(define (world-get world x y)
+  (vector-ref (world-map world) (coords->index world x y)))
+
+(define (world-set! world x y obj)
+  (vector-set! (world-map world)
+               (coords->index world x y)
+               obj))
+
+(define (make-world width height)
+  (%make-world width height (make-vector (* width height) #f)))
+
+(define world (make-parameter #f))
+
+(define (for-world proc world)
+  (do ((y 1 (+ y 1)))
+      ((= y (world-height world)) #t)
+    (do ((x 1 (+ x 1)))
+        ((= x (world-width world)) #t)
+      (proc world x y))))
+
+(define (world-draw world)
+  (draw cursor-home)
+  (for-world (lambda (w x y)
+               (cond
+                ((thing? (world-get w x y))
+                 (draw (cursor-move x y)
+                       (thing-look (world-get w x y))))
+                (else
+                 (draw (cursor-move x y)
+                       " "))))
+             world))
+
+(define (world-init world)
+  (for-world (lambda (w x y)
+               (cond
+                ((or (= x 1)
+                     (= y 1)
+                     (= x (- (world-width world) 1))
+                     (= y (- (world-height world) 1)))
+                 (thing-place! w (wall x y)))
+                (else)))
+             world)
+  (thing-place! world (me)))
+
+(define-record-type thing
+  (make-thing name look x y z attrs)
+  thing?
+  (name thing-name)
+  (look thing-look thing-look-set!)
+  (x thing-x thing-x-set!)
+  (y thing-y thing-y-set!)
+  (z thing-z thing-z-set!)
+  (attrs thing-attrs thing-attrs-set!))
+
+(define (thing-place! world thing)
+  (world-set! world (thing-x thing) (thing-y thing) thing))
+
+(define (thing-move! world thing x y)
+  (world-set! world (thing-x thing) (thing-y thing) #f)
+  (thing-x-set! thing x)
+  (thing-y-set! thing y)
+  (world-set! world x y thing))
+
+(define (thing-move-relative! world thing dx dy)
+  (let* ((new-x (+ (thing-x thing) dx))
+         (new-y (+ (thing-y thing) dy))
+         (other (world-get world new-x new-y)))
+    (cond
+     ((and (thing? other)
+           (> (thing-z other) (thing-z thing))))
+     (else
+      (cond ((< new-x 1)
+             (set! new-x 1))
+            ((> new-x (- (world-width world) 1))
+             (set! new-x (- (world-width world) 1))))
+      (cond ((< new-y 1)
+             (set! new-y 1))
+            ((> new-y (- (world-height world) 1))
+             (set! new-y (- (world-height world) 1))))
+      (thing-move! world thing new-x new-y)))))
+
+(define (wall x y)
+  (make-thing 'wall "#" x y 100 '()))
+
+(define me
+  (make-parameter
+   (make-thing 'me "@" 40 10 2 '())))
+
+(define (up!)
+  (thing-move-relative! (world) (me) 0 -1))
+
+(define (down!)
+  (thing-move-relative! (world) (me) 0 1))
+
+(define (right!)
+  (thing-move-relative! (world) (me) 1 0))
+
+(define (left!)
+  (thing-move-relative! (world) (me) -1 0))