I added these to SXEmacs a little while ago. They are a couple of macros that can be used when you need to conditionalise on emacs flavour. And at the same time not generate byte-compiler warnings, regardless of the flavour of emacs you are using to compile the .el. It is my hope that both XEmacs and GNU/Emacs will include these macros so that elisp programmers can benefit from them no matter what their preferred emacsen is. ChangeLog entry for XEmacs (sorry, I have no clue where these macros should go in GNU/Emacs)... 2007-08-19 Steve Youngs <steve(a)sxemacs.org&gt; * subr.el (do-in-sxemacs, do-in-xemacs, do-in-gnu-emacs) (with-emacs-type): Convenience macros to use when you need to conditionalise on emacs flavour. They have the added advantage of suppressing byte-compiler warnings. diff -r ad09012c3de7 lisp/subr.el --- a/lisp/subr.el Wed Aug 15 23:23:30 2007 +0000 +++ b/lisp/subr.el Sun Aug 19 00:29:24 2007 +1000 ＠＠ -188,6 +188,69 ＠＠ ELT must be a string. Upper-case and lo (while (and list (not (eq t (compare-strings elt 0 nil (car list) 0 nil t)))) (setq list (cdr list))) list) + +;; Convenience macros to let you conditionalise code for different +;; emacs variants without generating any byte-compiler warnings + +(eval-when-compile + (if (featurep 'xemacs) + (or (featurep 'sxemacs) + (defvar running-sxemacs)) + (defvar running-sxemacs) + (defvar running-xemacs))) + +(defmacro do-in-sxemacs (&rest body) + "Execute BODY if in SXEmacs." + (and running-sxemacs + (cons 'progn body))) + +(put 'do-in-sxemacs 'lisp-indent-hook 'defun) + +(defmacro do-in-xemacs (&rest body) + "Execute BODY if in XEmacs." + (and running-xemacs + (cons 'progn body))) + +(put 'do-in-xemacs 'lisp-indent-hook 'defun) + +(defmacro do-in-gnu-emacs (&rest body) + "Execute BODY if in GNU/Emacs." + (unless (or running-sxemacs + running-xemacs) + (cons 'progn body))) + +(put 'do-in-gnu-emacs 'lisp-indent-hook 'defun) + +(defmacro with-emacs-type (type &rest body) + "Execute BODY depending on emacs TYPE. + +Argument TYPE is a quoted symbol, being one of `sxemacs', `xemacs', or +`gnu'. For example... + + \(with-emacs-type 'sxemacs + ;; SXEmacs only code goes here. + ;; XEmacs and GNU/Emacs won't see it and won't complain about unbound + ;; funcs/vars. + \) + \(with-emacs-type 'xemacs + ;; XEmacs code goes here. + ;; GNU/Emacs won't see it and won't complain about unbound funcs/vars. + \) + \(with-emacs-type 'gnu + ;; GNU/Emacs code goes here. + ;; SXEmacs and XEmacs won't see it and won't complain about unbound + ;; funcs/vars. + \)" + (cond + ((equal type '(quote sxemacs)) + (do-in-sxemacs (cons 'progn body))) + ((equal type '(quote xemacs)) + (do-in-xemacs (cons 'progn body))) + ((equal type '(quote gnu)) + (do-in-gnu-emacs (cons 'progn body))) + (t (error 'invalid-argument type)))) + +(put 'with-emacs-type 'lisp-indent-hook 'defun)  ;;;; Keymap support. -- |---<Steve Youngs>---------------<GnuPG KeyID: A94B3003>---| | SXEmacs - The only _______ you'll ever need. | | Fill in the blank, yes, it's THAT good! | |------------------------------------&lt;steve(a)sxemacs.org&gt;---| _______________________________________________ XEmacs-Patches mailing list XEmacs-Patches(a)xemacs.org http://calypso.tux.org/cgi-bin/mailman/listinfo/xemacs-patches