mes/module/srfi/srfi-0.mes

;;; -*-scheme-*-

;;; Mes --- Maxwell Equations of Software
;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
;;;
;;; srfi-0.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/>.

;;; Commentary:

;;; srfi-0.mes - cond-expand

;;; Code:

(define mes '(0 1))

(define (cond-expand-expander clauses)
  (let loop ((clauses clauses))
    (if (defined? (caar clauses))
        (eval (cons 'begin (cdar clauses)) (current-module))
        (loop (cdr clauses)))))

(define-macro (cond-expand . clauses)
  `(cond-expand-expander (quote ,clauses)))