;; Copyright 2007-2011, Matthew Welland.
;;
;; This program is made available under the GNU GPL version 2.0 or
;; greater. See the accompanying file COPYING for details.
;;
;; This program is distributed WITHOUT ANY WARRANTY; without even the
;; implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
;; PURPOSE.
;;
;;======================================================================
;; Sugar
;;======================================================================
;;
;; (require 'syntax-case)
;;
;; (define-syntax s:if-param
;; (syntax-rules ()
;; [(_ s x) (if (s:get s) x (s:comment "s:if not"))]
;; [(_ s x y) (if (s:get s) x y)]))
;; ;;
;; (define-syntax s:if-test
;; (syntax-rules ()
;; [(_ s x) (if (string=? "yep" s) x (list "s:if not"))]
;; [(_ s x y) (if (string=? "yep" s) x y)]))
(define-macro (s:if-param varname . dat)
(match dat
(() '())
((a) `(if (s:get ,varname) ,a '()))
((a b) `(if (s:get ,varname) ,a ,b))))
(define-macro (s:if-sessionvar varname . dat)
(match dat
(() '())
((a) `(if (s:session-var-get ,varname) ,a '()))
((a b) `(if (s:session-var-get ,varname) ,a ,b))))