Version control lib.lisp

1 files changed, 28 insertions, 0 deletions

diff --git a/2022/lib.lisp b/2022/lib.lisp
new file mode 100644
index 0000000..b6fa70f
--- /dev/null
+++ b/2022/lib.lisp
@@ -0,0 +1,28 @@
+(defun string-to-clist (str)
+  (coerce str 'list))
+
+(defun clist-to-string (clist)
+  (if (atom clist)
+      (string clist)
+      (coerce clist 'string)))
+
+(defun split-by (lst delim)
+  "Splits LST by the first instance of DELIM"
+  (let ((pos (position delim lst)))
+    (if pos
+        (cons (subseq lst 0 pos) (list (subseq lst (+ pos 1))))
+        (error (format nil "No instance of ~a was found in ~a" delim lst)))))
+
+(defun split-completely (lst delim)
+  (if (or (null lst) (not (cdr lst)))
+      (cons (list (car lst)) nil)
+      (if (member delim lst)
+          (destructuring-bind (first rest) (split-by lst delim)
+            (cons first (split-completely rest delim)))
+          (list lst))))
+
+(defun get-lines (input-string)
+  (with-input-from-string (s input-string)
+    (loop for line = (read-line s nil)
+          while line
+          collect line)))