From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Michael Heerdegen Newsgroups: gmane.emacs.help Subject: Re: replacing a function with another one Date: Wed, 12 Mar 2014 00:21:49 +0100 Message-ID: <87a9cwtj76.fsf@web.de> References: <87vbvofsi6.fsf@yun.yagibdah.de> <87bnxgs4r9.fsf@web.de> <87lhwj1cfz.fsf@yun.yagibdah.de> <87zjkz6vd5.fsf@web.de> <8738ir161u.fsf@yun.yagibdah.de> <87eh2b6nfm.fsf@web.de> <87r46anab5.fsf@yun.yagibdah.de> <87vbvleiey.fsf@yun.yagibdah.de> <87vbvlbm8p.fsf@web.de> <87siqpsdgs.fsf@yun.yagibdah.de> <87iorljkhx.fsf@web.de> <87pplsivy7.fsf@yun.yagibdah.de> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Trace: ger.gmane.org 1394580146 9993 80.91.229.3 (11 Mar 2014 23:22:26 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 11 Mar 2014 23:22:26 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Wed Mar 12 00:22:34 2014 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1WNW0I-0003Vp-Ac for geh-help-gnu-emacs@m.gmane.org; Wed, 12 Mar 2014 00:22:34 +0100 Original-Received: from localhost ([::1]:57867 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WNW0H-00025S-Qv for geh-help-gnu-emacs@m.gmane.org; Tue, 11 Mar 2014 19:22:33 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:55680) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WNW00-0001jW-SX for help-gnu-emacs@gnu.org; Tue, 11 Mar 2014 19:22:23 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WNVzs-0004Ff-1m for help-gnu-emacs@gnu.org; Tue, 11 Mar 2014 19:22:16 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:34455) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WNVzr-0004Fb-Rv for help-gnu-emacs@gnu.org; Tue, 11 Mar 2014 19:22:07 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1WNVzq-0003Bk-S6 for help-gnu-emacs@gnu.org; Wed, 12 Mar 2014 00:22:06 +0100 Original-Received: from ip-90-187-149-152.web.vodafone.de ([90.187.149.152]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 12 Mar 2014 00:22:06 +0100 Original-Received: from michael_heerdegen by ip-90-187-149-152.web.vodafone.de with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 12 Mar 2014 00:22:06 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 29 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: ip-90-187-149-152.web.vodafone.de User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux) Cancel-Lock: sha1:11OnHZDLNUVVeuiGwGyJ/oz4SnI= X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:96435 Archived-At: lee writes: > Maybe the problem is that add-advice is too complicated and convoluted. > I learned about defadvice in like no time, it´s clear and simple --- > while advice-add is anything but. On the contrary. nadvice is as simple as it could be. To understand how an :around advice works, it takes one line (lambda (&rest r) (apply FUNCTION OLDFUN r)) That's a non-ambiguous specification from which you can clearly derive how the advice FUNCTION will be used. It can't be simpler. The problem is that many people are not so used to lambda expressions and parameter substitution and so they don't understand it. If you take a pencil and a sheet of paper and evaluate an example for yourself by hand, step by step, you'll understand how it works. And no, this is not missing in the documentation. The Emacs documentation is not an introduction into lambda calculus and writing LISP code. Once you have really understood how evaluation of expressions in LISP works, you'll understand the above definition. > Considering all that, wouldn´t it be much better to create my own > mode? I don't think this is appropriate, because what you want can be done in few lines without making much assumptions about the original package. Michael.