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(load "~/quicklisp/setup.lisp")
(ql:quickload 'uiop :silent t)
(ql:quickload 'cl-ppcre :silent t)
(defun get-file-lines (name)
(uiop:read-file-lines name))
;; Turn the input file into whatever form you will use for both parts
;; (get-file-lines) and (get-file-string) will be useful
(defun parse-input (input-file)
(let ((input (mapcar (lambda (s) (cl-ppcre:split " " s)) (get-file-lines input-file))))
(mapcar (lambda (x) (cons (intern (string-upcase (CAR x))) (parse-integer (CADR x)))) input)))
(defun part-a (parsed-input)
(let ((h 0) (v 0))
(dolist (i parsed-input)
(case (car i)
(forward (incf h (cdr i)))
(up (decf v (cdr i)))
(down (incf v (cdr i)))))
(* h v)))
(defun part-b (parsed-input)
(let ((h 0) (v 0) (a 0))
(dolist (i parsed-input)
(case (car i)
(forward (progn (incf v (* (cdr i) a)) (incf h (cdr i))))
(up (decf a (cdr i)))
(down (incf a (cdr i)))))
(* h v)))
(time (format t "part 2: ~a~%" (part-a (parse-input "../inputs/02.txt"))))
(time (format t "part 2: ~a~%" (part-b (parse-input "../inputs/02.txt"))))
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