From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: =?utf-8?Q?=C3=93scar_Fuentes?= Newsgroups: gmane.emacs.help Subject: Re: How to reject visiting a file Date: Fri, 12 Dec 2014 16:47:20 +0100 Message-ID: <87fvckan07.fsf@wanadoo.es> References: <87oar9abdc.fsf@wanadoo.es> <83k31xs3dg.fsf@gnu.org> <87k31waoah.fsf@wanadoo.es> 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 1418399285 29489 80.91.229.3 (12 Dec 2014 15:48:05 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 12 Dec 2014 15:48:05 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Fri Dec 12 16:47:58 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 1XzSRh-00088r-IH for geh-help-gnu-emacs@m.gmane.org; Fri, 12 Dec 2014 16:47:57 +0100 Original-Received: from localhost ([::1]:57937 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XzSRh-0002Qd-5Y for geh-help-gnu-emacs@m.gmane.org; Fri, 12 Dec 2014 10:47:57 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:55847) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XzSRQ-0002QH-KZ for help-gnu-emacs@gnu.org; Fri, 12 Dec 2014 10:47:46 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XzSRK-0007wG-Mp for help-gnu-emacs@gnu.org; Fri, 12 Dec 2014 10:47:40 -0500 Original-Received: from plane.gmane.org ([80.91.229.3]:44714) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XzSRK-0007w7-G5 for help-gnu-emacs@gnu.org; Fri, 12 Dec 2014 10:47:34 -0500 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1XzSRJ-0007S4-Nl for help-gnu-emacs@gnu.org; Fri, 12 Dec 2014 16:47:33 +0100 Original-Received: from 129.red-88-10-128.dynamicip.rima-tde.net ([88.10.128.129]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 12 Dec 2014 16:47:33 +0100 Original-Received: from ofv by 129.red-88-10-128.dynamicip.rima-tde.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 12 Dec 2014 16:47:33 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 27 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 129.red-88-10-128.dynamicip.rima-tde.net User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) Cancel-Lock: sha1:/ikVUp3iik0qa2RjOFsRg/4M0DM= 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:101546 Archived-At: Stefan Monnier writes: >>>> Is there a way to error-out when Emacs tries to visit certain file >>>> before the file is loaded? I'll like to use a hook that receives the >>>> file name and be able to throw an error from there that aborts the >>>> operation. >>> You could define a file-handler for these files. >> Yes, that looks like a solution. >> For the record, the relevant info is in the Elisp manual: >> Making Certain File Names “Magic” > > I think that's going to be pretty heavyweight. I hope not. The function will inspect the file name (possibly the primitive too) and either throw an error or delegate to file-name-non-special. > A simpler approach is something like > > (defun sm-prevent-visiting-files (filename &rest _) > (if (string-match "nasty-file-name" filename) > (error "Bad! Bad file name! Bad!"))) > (advice-add 'find-file-noselect :before #'sm-prevent-visiting-files) That was my first idea, but it was discarded because I'm not sure about its coverage. I don't know the method a given package can use to visit/load/read a file.