syntax.scm

(define-macro (define-record/keywords name-form . slots)
  (let* ((name (if (pair? name-form) (car name-form) name-form))
         (printer (and (pair? name-form) (cadr name-form)))
         (slot-names (map (lambda (slot) (if (pair? slot) (car slot) slot))
                          slots))
         (stem (trim-brackets name)))
    `(begin
       (define ,name (make-record-type ,(symbol->string name) ',slot-names
                                       ,@(if printer (list printer) '())))
       (define ,(symbol-append 'make- stem)
         (let ((slots (list ,@(map (lambda (slot)
                                     (if (pair? slot)
                                         `(cons ',(car slot) ,(cadr slot))
                                         `',slot))
                                   slots)))
               (constructor (record-constructor ,name)))
           (lambda args
             (apply constructor (%compute-initargs args slots)))))
       (define ,(symbol-append stem '?) (record-predicate ,name))
       ,@(map (lambda (sname)
                `(define ,(symbol-append stem '- sname)
                   (make-procedure-with-setter
                    (record-accessor ,name ',sname)
                    (record-modifier ,name ',sname))))
              slot-names))))