#!/usr/local/bin/sbcl --script

(defmacro -> (form &rest forms)
  (if (null forms)
      form
    (let ((git (intern (symbol-name '#:it))))
      (if (null (cdr forms))
          `(let ((,git ,form)) ,(car forms))
        `(let ((,git ,form)) (-> ,@forms))))))

(defun square (n)
  (* n n))

(defun add1 (n)
  (1+ n))

(princ (-> 5 (add1 it) (square it)))