From a22fc23acdab7504e6db03c7e44dc1dcf22c733d Mon Sep 17 00:00:00 2001
From: Oscar Najera <hi@oscarnajera.com>
Date: Sat, 16 Dec 2023 11:43:11 +0100
Subject: refactor single slide

---
 AoC2023/day14/solve.lisp | 45 ++++++++++++++++++++-------------------------
 1 file changed, 20 insertions(+), 25 deletions(-)

diff --git a/AoC2023/day14/solve.lisp b/AoC2023/day14/solve.lisp
index 9f9d6e8..e476bd5 100644
--- a/AoC2023/day14/solve.lisp
+++ b/AoC2023/day14/solve.lisp
@@ -16,22 +16,17 @@
          (< -1 col maxcol))))
 
 (defun roll-rocks (field direction)
-  (loop for row below (array-dimension field 0)
-        sum
-        (loop for col below (array-dimension field 1)
-              for (new-row new-col) = (roll direction row col)
-              when (and
-                    (in-bounds field new-row new-col)
-                    (eq #\O (aref field row col))
-                    (eq #\. (aref field new-row new-col)))
-                do (setf (aref field new-row new-col) #\O
-                         (aref field row col) #\.)
-                and count t)))
-
-(defun roll-rocks-full (field direction)
-  (loop
-    for result = (roll-rocks field direction)
-    until (zerop result)))
+  (loop for i below (array-dimension field 0) do
+    (loop for j below (array-dimension field 1) do
+      (loop
+        for (row col) = (list i j) then (list new-row new-col)
+        for (new-row new-col) = (roll direction row col)
+        while (and
+               (in-bounds field new-row new-col)
+               (eq #\O (aref field row col))
+               (eq #\. (aref field new-row new-col)))
+        do (setf (aref field new-row new-col) #\O
+                 (aref field row col) #\.)))))
 
 (defun array-slice (arr row)
   (make-array (array-dimension arr 1)
@@ -48,17 +43,16 @@
   (let* ((rows (length input))
          (field
            (make-array (list rows (length (car input))) :initial-contents input)))
-    (roll-rocks-full field 'north)
+    (roll-rocks field 'north)
     (north-load field)))
 
-(defun draw-field (field)
+(defun draw-field (field &optional (out *standard-output*))
   (destructuring-bind (maxrow maxcol) (array-dimensions field)
-    (with-output-to-string (out)
-
-      (loop for i below maxrow do
-        (loop for j below maxcol do
-          (write-char (aref field i j) out))
-        (terpri out)))))
+    (loop for i below maxrow do
+      (loop for j below maxcol do
+        (write-char (aref field i j) out))
+      (terpri out))
+    (terpri out)))
 
 (defun solve2 (input iters)
   (let* ((rows (length input))
@@ -76,6 +70,7 @@
 ;; (solve2 (uiop:read-file-lines "input") 100)
 (fiveam:test solutions
   (fiveam:is (= 136 (solve1 (uiop:read-file-lines "eg-in"))))
-  (fiveam:is (= 108935 (solve1 (uiop:read-file-lines "input")))))
+  (fiveam:is (= 108935 (solve1 (uiop:read-file-lines "input"))))
+  )
 
 (fiveam:run!)
-- 
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