From 135ce20d06bdee95299fa4ad1c100da4ddd2a4e4 Mon Sep 17 00:00:00 2001
From: Oscar Najera <hi@oscarnajera.com>
Date: Fri, 16 Dec 2022 17:02:52 +0100
Subject: solve ex can't use named-let run out of stack use while

---
 AoC2022/14/solver.el | 49 +++++++++++++++++++++++--------------------------
 1 file changed, 23 insertions(+), 26 deletions(-)

(limited to 'AoC2022/14')

diff --git a/AoC2022/14/solver.el b/AoC2022/14/solver.el
index a5cc896..749b29b 100644
--- a/AoC2022/14/solver.el
+++ b/AoC2022/14/solver.el
@@ -81,12 +81,6 @@
   (let ((array (copy-sequence (grid-grid grid)))
         (stride (grid-stride grid))
         (y-len (grid-y-len grid)))
-    ;; (cl-flet ((picture-coord
-    ;;            (idx)
-    ;;            (let ((x (mod idx stride))
-    ;;                  (y (- y-len (/ idx stride) 1)))
-    ;;              (+ x (* y stride)))))
-    ;;   (seq-do-indexed (lambda (value idx) (aset array (picture-coord idx) value)) (grid-grid grid)))
     (create-image array
                   'xbm t
                   :scale 20
@@ -94,8 +88,7 @@
                   :width (grid-x-len grid)
                   :height (grid-y-len grid)
                   :foreground "#ffffff"
-                  :background "#000000"
-                  )))
+                  :background "#000000")))
 
 (defun solver-draw-grid (grid)
   (let ((stride (grid-stride grid)))
@@ -117,29 +110,33 @@
 
 (solver-point 496 3 (solver-grid-create '(503 494 9 4)))
 
+(defun solver-simulate (grid)
+  (let ((x 500) (y 0) (drops 0))
+    (while
+        (ignore-error 'wrong-type-argument ;; went out of grid
+          (cond
+           ((= 0 (aref (grid-grid grid) (solver-point x (1+ y) grid)))
+            (cl-incf y)) ;; check next
+           ((= 0 (aref (grid-grid grid) (solver-point (1- x) (1+ y) grid)))
+            (cl-incf y)
+            (cl-decf x)) ;; check left
+           ((= 0 (aref (grid-grid grid) (solver-point (1+ x) (1+ y) grid)))
+            (cl-incf y)
+            (cl-incf x)) ;; check right
+           (t (aset (grid-grid grid) (solver-point x y grid) 2)
+              (cl-incf drops)
+              (setq x 500 y 0)))))
+    drops))
+
 (let* ((instr   "498,4 -> 498,6 -> 496,6
 503,4 -> 502,4 -> 502,9 -> 494,9")
+       (instr (find-file-noselect "input"))
        (bounds (solver-bounds instr))
        (grid (solver-grid-create bounds))
-       (drops 0))
+       )
   (solver-walls instr grid)
-  ;; (thread-first
-  ;;   (solver-draw-wall grid)
-  ;;   (insert-image))
-
-  grid
   ;; sim
-  (named-let loop ((x 500)
-                   (y 0))
+  (solver-simulate grid)
 
-    (ignore-error 'wrong-type-argument ;; went out of grid
-      (cond
-       ((= 0 (aref (grid-grid grid) (solver-point x (1+ y) grid))) (loop x (1+ y))) ;; check next
-       ((= 0 (aref (grid-grid grid) (solver-point (1- x) (1+ y) grid))) (loop (1- x) (1+ y))) ;; check left
-       ((= 0 (aref (grid-grid grid) (solver-point (1+ x) (1+ y) grid))) (loop (1+ x) (1+ y))) ;; check right
-       (t (aset (grid-grid grid) (solver-point x y grid) 2)
-          (cl-incf drops)
-          (loop 500 0)))))
-  (solver-draw-grid grid)
-  drops
+  ;; (solver-draw-grid grid)
   )
-- 
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