From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: "Davis Herring" Newsgroups: gmane.emacs.devel Subject: Re: Activating a function when a variable is set Date: Thu, 25 Oct 2007 14:21:21 -0700 (PDT) Message-ID: <37240.128.165.123.18.1193347281.squirrel@webmail.lanl.gov> References: <47211002.80403@ig.com.br> Reply-To: herring@lanl.gov NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Trace: ger.gmane.org 1193347322 6239 80.91.229.12 (25 Oct 2007 21:22:02 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 25 Oct 2007 21:22:02 +0000 (UTC) Cc: GNU Emacs To: "Vinicius Jose Latorre" Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Thu Oct 25 23:22:04 2007 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1IlA9S-0001EK-N2 for ged-emacs-devel@m.gmane.org; Thu, 25 Oct 2007 23:22:03 +0200 Original-Received: from localhost ([127.0.0.1] helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1IlA9K-0006t7-6z for ged-emacs-devel@m.gmane.org; Thu, 25 Oct 2007 17:21:54 -0400 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1IlA97-0006lE-HL for emacs-devel@gnu.org; Thu, 25 Oct 2007 17:21:41 -0400 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1IlA92-0006hT-Os for emacs-devel@gnu.org; Thu, 25 Oct 2007 17:21:41 -0400 Original-Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1IlA92-0006hI-JB for emacs-devel@gnu.org; Thu, 25 Oct 2007 17:21:36 -0400 Original-Received: from mailwasher.lanl.gov ([204.121.3.2]) by monty-python.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1IlA92-0001z8-2N for emacs-devel@gnu.org; Thu, 25 Oct 2007 17:21:36 -0400 Original-Received: from mailrelay2.lanl.gov (mailrelay2.lanl.gov [128.165.4.103]) by mailwasher.lanl.gov (8.13.8/8.13.8/(ccn-5)) with ESMTP id l9PLLQRl002436; Thu, 25 Oct 2007 15:21:27 -0600 Original-Received: from webmail1.lanl.gov (webmail1.lanl.gov [128.165.4.106]) by mailrelay2.lanl.gov (8.13.8/8.13.8/(ccn-5)) with ESMTP id l9PLLMQn022953; Thu, 25 Oct 2007 15:21:22 -0600 Original-Received: from webmail1.lanl.gov (localhost.localdomain [127.0.0.1]) by webmail1.lanl.gov (8.12.11.20060308/8.12.11) with ESMTP id l9PLLMSY023236; Thu, 25 Oct 2007 15:21:22 -0600 Original-Received: (from apache@localhost) by webmail1.lanl.gov (8.12.11.20060308/8.12.11/Submit) id l9PLLL0F023231; Thu, 25 Oct 2007 14:21:21 -0700 X-Authentication-Warning: webmail1.lanl.gov: apache set sender to herring@lanl.gov using -f Original-Received: from 128.165.123.18 (SquirrelMail authenticated user 196434) by webmail.lanl.gov with HTTP; Thu, 25 Oct 2007 14:21:21 -0700 (PDT) In-Reply-To: <47211002.80403@ig.com.br> User-Agent: SquirrelMail/1.4.8-6.el3.2lanl X-Priority: 3 (Normal) Importance: Normal X-CTN-5-MailScanner-Information: Please see http://network.lanl.gov/email/virus-scan.php X-CTN-5-MailScanner: Found to be clean X-CTN-5-MailScanner-From: herring@lanl.gov X-detected-kernel: by monty-python.gnu.org: Linux 2.4-2.6 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:81714 Archived-At: > Does anybody know if there is a way to activate a function when a > variable is set to t and also when the same variable is set to nil? As in, react immediately to (setq trapped-variable t)? No. With custom variables you can react to them being customized by giving them a :set attribute. But AFAIK there's no way to "detect" a change to a Lisp variable. Davis -- This product is sold by volume, not by mass. If it appears too dense or too sparse, it is because mass-energy conversion has occurred during shipping.