;;; -*-scheme-*-

;;; Mes --- Maxwell Equations of Software
;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
;;;
;;; base.mes: This file is part of Mes.
;;;
;;; Mes is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; Mes is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with Mes.  If not, see <http://www.gnu.org/licenses/>.

(define-macro (if expr then . else)
  (list 'cond ;; COND
        (list expr then)
        (list #t (list 'cond (list (pair? else) ;; COND
                                   (cons (cons 'lambda (cons '() (cons (cons 'begin (cons *unspecified* else)) '()))) '()))))))

(define (cons* x . rest)
  (define (loop rest)
    (cond ((null? (cdr rest)) (car rest)) ;; COND
          (#t (cons (car rest) (loop (cdr rest))))))
  (loop (cons x rest)))