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-#!/bin/sh
-#| -*- scheme -*-
-exec csi -R r7rs -ss "$0" "$@"
-game --- 2023 lisp game jam
-(C) Case Duckworth <acdw@acdw.net>
-Distributed under the terms of the LATCRIFPL, v1.0.
-See COPYING for details.
-|#
-
-(import (scheme base)
-        (scheme time)
-        (scheme write)
-        (chicken io)
-        (chicken port)
-        (chicken random)
-        (yolk common)
-        (yolk xterm)
-        (yolk erase)
-        (yolk cursor)
-        (yolk attrs)
-        (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)))
-    (parameterize ((me (let-values (((x y) (random-point (world))))
-                         (make-thing 'me (world)
-                                     (with-attrs '(red) "ó") x y 2)))
-                   (snake (let-values (((x y) (random-point (world))))
-                            (make-snake (world) 5 (current-jiffy) 100 'left
-                                        (make-thing 'snake-head (world)
-                                                    "<" x y 2)
-                                        (list (make-thing 'snake-tail (world)
-                                                          "-" (+ 1 x) y 2))))))
-      (dynamic-wind game-setup
-                    game-loop
-                    game-cleanup)))
-  #t)
-
-(define me (make-parameter #f))
-(define world (make-parameter #f))
-(define snake (make-parameter #f))
-
-(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)
-  (call/cc
-   (lambda (return)
-     (let loop ((now (current-jiffy)))
-       (handle-input return)
-       (snake-step (snake) now)
-       (world-draw (world))
-       (loop (current-jiffy))))))
-
-(define (handle-input done)
-  (if (char-ready?)
-      (match (readch)
-        (#\q (done))
-        (#\k (up!))
-        (#\j (down!))
-        (#\l (right!))
-        (#\h (left!))
-        ;; Escape characters
-        (#\escape (match (readch)
-                    (#\[ (match (readch)
-                           (#\A (up!))
-                           (#\B (down!))
-                           (#\C (right!))
-                           (#\D (left!))
-                           (_ #f)))
-                    (_ #f)))
-        (x (log* x)))
-      #f))
-
-(define (readch)
-  (let ((c (integer->char (read-byte))))
-    c))
-
-;;; random
-
-(define random-int
-  (case-lambda
-    (() (pseudo-random-integer 100))
-    ((max) (pseudo-random-integer max))
-    ((min max)
-     (let ((max (if (> max min) max min))
-           (min (if (< min max) min max)))
-       (+ min (pseudo-random-integer (- max min)))))))
-
-(define (random-x world)
-  (random-int 1 (- (world-width world) 1)))
-
-(define (random-y world)
-  (random-int 1 (- (world-height world) 1)))
-
-(define (random-point world)
-  (let loop ((x (random-x world))
-             (y (random-y world)))
-    (if (world-get world x y)
-        (loop (random-x world) (random-y world))
-        (values x y))))
-
-;;; Drawing stuff
-
-(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))
-
-;;; World
-
-(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 (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! (wall w x y)))
-                (else)))
-             world)
-  (thing-place! (me))
-  (thing-place! (snake-head (snake)))
-  (for-each (lambda (t) (thing-place! t))
-            (snake-tail (snake))))
-
-;;; Things
-
-(define-record-type <thing>
-  (make-thing name world look x y z)
-  thing?
-  (name thing-name)
-  (world thing-world thing-world-set!)
-  (look thing-look thing-look-set!)
-  (x thing-x thing-x-set!)
-  (y thing-y thing-y-set!)
-  (z thing-z thing-z-set!))
-
-(define (wall w x y)
-  (make-thing 'wall w "#" x y 100))
-
-(define (thing-attr-get thing attr)
-  (let ((x (assoc attr (thing-attrs thing))))
-    (if x
-        (cdr x)
-        #f)))
-
-(define (thing-attr-set! thing attr val)
-  (let ((x (assoc attr (thing-attrs thing))))
-    (if x
-        (set-cdr! x val)
-        (thing-attrs-set! thing
-                          (cons (cons attr val)
-                                (thing-attrs thing))))))
-
-(define (thing-place! thing)
-  (world-set! (thing-world thing) (thing-x thing) (thing-y thing) thing))
-
-(define (thing-move! thing x y)
-  (let ((world (thing-world thing)))
-    (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! thing dx dy)
-  (let* ((world (thing-world thing))
-         (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! thing new-x new-y)))))
-
-(define (thing-up! thing)
-  (thing-move-relative! thing 0 -1))
-
-(define (thing-down! thing)
-  (thing-move-relative! thing 0 1))
-
-(define (thing-right! thing)
-  (thing-move-relative! thing 1 0))
-
-(define (thing-left! thing)
-  (thing-move-relative! thing -1 0))
-
-(define (up!) (thing-up! (me)))
-(define (down!) (thing-down! (me)))
-(define (left!) (thing-left! (me)))
-(define (right!) (thing-right! (me)))
-
-(define (thing-above thing)
-  (if (< (thing-y thing) 1)
-      #f
-      (world-get (thing-world thing)
-                 (thing-x thing)
-                 (- (thing-y thing) 1))))
-
-(define (thing-below thing)
-  (if (> (thing-y thing) (world-height (thing-world thing)))
-      #f
-      (world-get (thing-world thing)
-                 (thing-x thing)
-                 (+ (thing-y thing) 1))))
-
-(define (thing-to-left thing)
-  (if (< (thing-x thing) 1)
-      #f
-      (world-get (thing-world thing)
-                 (- (thing-x thing) 1)
-                 (thing-y thing))))
-
-(define (thing-to-right thing)
-  (if (> (thing-x thing) (world-width (thing-world thing)))
-      #f
-      (world-get (thing-world thing)
-                 (+ (thing-x thing) 1)
-                 (thing-y thing)
-                 )))
-
-;;; snake
-
-(define-record-type <snake>
-  (make-snake world length mtime wait direction head tail)
-  snake?
-  (length snake-length snake-length-set!)
-  (world snake-world snake-world-set!)
-  (mtime snake-mtime snake-mtime-set!)
-  (direction snake-direction snake-direction-set!)
-  (wait snake-wait snake-wait-set!)
-  (head snake-head snake-head-set!)
-  (tail snake-tail snake-tail-set!))
-
-(define (snake-x snake)
-  (thing-x (snake-head snake)))
-
-(define (snake-y snake)
-  (thing-y (snake-head snake)))
-
-(define (snake-z snake)
-  (thing-z (snake-head snake)))
-
-(define (take* xs n)
-  ;;; Like `take' from SRFI 1, but doesn't choke on too-short lists.
-  (unless (and (integer? n)
-               (> n 0))
-    (error "Must take non-negative integer" n))
-  (let loop ((xs xs)
-             (n n)
-             (acc '()))
-    (if (or (null? xs)
-            (zero? n))
-        (reverse acc)
-        (loop (cdr xs)
-              (- n 1)
-              (cons (car xs) acc)))))
-
-(define (snake-step snake now)
-  (when (> now (+ (snake-mtime snake) (snake-wait snake)))
-    (let ((new-tail (make-thing 'snake-tail (snake-world snake)
-                                (if (snake-vertical? snake)
-                                    "|"
-                                    "-")
-                                (snake-x snake)
-                                (snake-y snake)
-                                (snake-z snake))))
-      (snake-update-head! snake)
-      (apply thing-move-relative!
-             (snake-head snake)
-             (direction->velocity (snake-direction snake)))
-      (snake-update-direction! snake)
-      (for-each (lambda (t) (world-set! (snake-world snake)
-                                   (thing-x t)
-                                   (thing-y t)
-                                   #f))
-                (snake-tail snake))
-      (snake-tail-set! snake
-                       (take* (cons new-tail
-                                    (snake-tail snake))
-                              (snake-length snake)))
-      (for-each (lambda (t) (thing-place! t))
-                (snake-tail snake))
-      (snake-mtime-set! snake now))))
-
-(define (direction->velocity direction)
-  (case direction
-    ((up) '(0 -1))
-    ((down) '(0 1))
-    ((left) '(-1 0))
-    ((right) '(1 0))
-    (else direction)))
-
-(define (snake-vertical? snake)
-  (or (eq? (snake-direction snake) 'up)
-      (eq? (snake-direction snake) 'down)))
-
-(define (snake-update-head! snake)
-  (thing-look-set! (snake-head snake)
-                   (case (snake-direction snake)
-                     ((right) ">")
-                     ((down) "v")
-                     ((left) "<")
-                     ((up) "^"))))
-
-(define (snake-update-direction! snake)
-  (let ((head (snake-head snake)))
-    (case (snake-direction snake)
-      ((up)
-       (when (thing-above head)
-         (snake-direction-set! snake 'left)))
-      ((down)
-       (when (thing-below head)
-         (snake-direction-set! snake 'right)))
-      ((left)
-       (when (thing-to-left head)
-         (snake-direction-set! snake 'down)))
-      ((right)
-       (when (thing-to-right head)
-         (snake-direction-set! snake 'up))))))