From efcc7c32228d87f9f41cd5963491e9d11ee30dfb Mon Sep 17 00:00:00 2001
From: Oscar Najera <hi@oscarnajera.com>
Date: Sat, 11 Feb 2023 19:34:20 +0100
Subject: Clojure day05

---
 AoC2022/05/solver.el | 26 ++++++++++----------------
 1 file changed, 10 insertions(+), 16 deletions(-)

(limited to 'AoC2022/05/solver.el')

diff --git a/AoC2022/05/solver.el b/AoC2022/05/solver.el
index ed42bb2..b81e4be 100644
--- a/AoC2022/05/solver.el
+++ b/AoC2022/05/solver.el
@@ -15,6 +15,7 @@
 ;;
 ;;; Code:
 (require 'subr-x)
+(require 'cl-lib)
 
 (defun solver-build-stacks ()
   (let* ((stacks-len (length
@@ -27,38 +28,31 @@
             (aref stacks (/ (- next (line-beginning-position) 1) 4))))
     stacks))
 
-(defun solver-single-move! (stacks amount from to)
-  (dotimes (_ amount)
-    (push (pop (aref stacks from)) (aref stacks to))))
-
-(defun solver-bulk-move! (stacks amount from to)
-  (setf (aref stacks to)
-        (append (seq-take (aref stacks from) amount)
-                (aref stacks to)))
-  (setf (aref stacks from) (seq-drop (aref stacks from) amount)))
-
-(defun solver-apply-moves (execution stacks)
+(defun solver-apply-moves! (mover-f stacks)
   (while (re-search-forward (rx bol "move " (group (+ digit)) " from " (group (+ digit)) " to " (group (+ digit))) nil t)
     (let ((amount (string-to-number (match-string 1)))
           (from (1- (string-to-number (match-string 2))))
           (to (1- (string-to-number (match-string 3)))))
-      (funcall execution stacks amount from to)))
+      (setf (aref stacks to)
+            (append (funcall mover-f (seq-take (aref stacks from) amount))
+                    (aref stacks to)))
+      (setf (aref stacks from) (seq-drop (aref stacks from) amount))))
   stacks)
 
-(defun solver (execution)
+(defun solver (bulkp)
   (with-temp-buffer
     (insert-file-contents "input")
     (re-search-forward "^ 1")
     (thread-last
       (solver-build-stacks)
-      (solver-apply-moves execution)
+      (solver-apply-moves! (if bulkp #'identity #'reverse))
       (cl-map 'string #'car))))
 
 (ert-deftest solver-solutions ()
   (should (equal "TPGVQPFDH"
-                 (solver #'solver-single-move!)))
+                 (solver nil)))
   (should (equal "DMRDFRHHH"
-                 (solver #'solver-bulk-move!))))
+                 (solver t))))
 
 
 (provide 'solver)
-- 
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