;;; defmac (define macro) and defsmac (define simple macro) are like defun,
;;; but they define the function as a macro instead of as an expr.  They are
;;; less powerful then defining a macro directly (for example, they cannot be
;;; used to define macros with arbitrarily many arguments) but are easier to
;;; use.   For example,
;;;
;;; (defsmac f (x y) (foo (bar x) (bar y)))
;;;
;;; causes f to be defined as a macro in such a way that every call (f e1 e2)
;;; will expand to (foo (bar e1) (bar e2)) before it is evaluated.

(defun defsmac macro (args)
       (defsmac1 (cadr args) (caddr args) (cdddr args)))


(defun defsmac1 (name formals body)
       `(defun ,name macro (app)
                     ,(defsmac2 formals
                                  (cond ((cdr body) (cons 'progn body))
                                        (t (car body))))))

(defun defsmac2 (formals body)
       `(sublis  ,(defsmac3 formals 1) (quote ,body)))

(defun defsmac3 (formals n)
       (cond ((null formals) nil)
             (`(cons (cons (quote ,(car formals)) (car ,(defsmac4 n)))
                           ,(defsmac3 (cdr formals) (1+ n))))))

(defun defsmac4 (n) (cond ((= n 0) 'app) ((list 'cdr (defsmac4 (1- n))))))