From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Tim X Newsgroups: gmane.emacs.help Subject: Re: Redefining functions and variables Date: Thu, 29 Jul 2010 22:41:49 +1000 Organization: Unlimited download news at news.astraweb.com Message-ID: <8739v2piia.fsf@puma.rapttech.com.au> References: <68e690c9-aece-461d-afe9-ca9115ceaee5@m1g2000vbh.googlegroups.com> <76fd4dc4-a964-4629-90e2-329e1b83fd8d@h25g2000vba.googlegroups.com> <876300fnpk.fsf@fh-trier.de> <55e481e3-b894-499f-80b3-1c96b2c338ce@d37g2000yqm.googlegroups.com> <61db17c1-8c30-44a1-b96e-9eec802156fe@j8g2000yqd.googlegroups.com> <87tynjl9x3.fsf@fh-trier.de> <87hbjjibrk.fsf@kuiper.lan.informatimago.com> <08217e84-b4a0-4dd0-afbf-abd4d762c759@w30g2000yqw.googlegroups.com> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: dough.gmane.org 1291852684 16194 80.91.229.12 (8 Dec 2010 23:58:04 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Wed, 8 Dec 2010 23:58:04 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Thu Dec 09 00:58:00 2010 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1PQTtX-0008TE-Q4 for geh-help-gnu-emacs@m.gmane.org; Thu, 09 Dec 2010 00:57:59 +0100 Original-Received: from localhost ([127.0.0.1]:34434 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PQTtX-0000XC-9o for geh-help-gnu-emacs@m.gmane.org; Wed, 08 Dec 2010 18:57:59 -0500 Original-Path: usenet.stanford.edu!news.glorb.com!news2.glorb.com!news-xfer.nntp.sonic.net!news.astraweb.com!border2.newsrouter.astraweb.com!not-for-mail Original-Newsgroups: gnu.emacs.help User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux) Cancel-Lock: sha1:4dF+b6RlC3CTr5UfW+WsMF2L0bs= Original-Lines: 30 Original-NNTP-Posting-Host: 1018c8e0.news.astraweb.com Original-X-Trace: DXC=de^?5g>[Ud9hn]AcMfkkb9L?0kYOcDh@:W\:Hm@YlDb:R8J33anb9@?K8o3]ZYc List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:76254 Archived-At: Stefan Monnier writes: >> (defmacro defun (name args &rest body) > > Just as is the case for `defun', redefining macros with `defmacro' > is problematic. I really recommend not to do that and use defadvice > instead, which was designed specifically for this purpose. > > > Stefan If anyone wants a good example of what can be achieved just using defadvice, I would strongly recommend looking at emacspeak. The emacspeak package transforms emacs into a powerful text-to-speech system. Most of this is achieved by wrapping standard emacs functions in defadvice, which in turn sends the relevant bit of text to a text-to-speech synthesizer. Another similar package, which attempts to have minimal impact on how emacs works is speechd.el. It also uses defadvice. I frequently use defadvice to customize how functions work, resolve bugs while waiting for an update in some package or simply replace one function with one I have written. It is a very useful and powerful tool. Tim -- tcross (at) rapttech dot com dot au