From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Marcin Borkowski Newsgroups: gmane.emacs.help Subject: Re: How to define a (derived) minor mode inaccessible to the user Date: Thu, 28 Jan 2021 08:45:08 +0100 Message-ID: <87tur1ijy3.fsf@mbork.pl> References: <87eeidlfmw.fsf@mbork.pl> <87zh0zreah.fsf@web.de> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="25524"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: mu4e 1.1.0; emacs 28.0.50 Cc: Help Gnu Emacs mailing list To: Michael Heerdegen Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Thu Jan 28 08:51:18 2021 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1l525G-0006WY-Iq for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 28 Jan 2021 08:51:18 +0100 Original-Received: from localhost ([::1]:40664 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l525D-0005Mh-Vk for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 28 Jan 2021 02:51:16 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:48740) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l51zc-0007TZ-NZ for help-gnu-emacs@gnu.org; Thu, 28 Jan 2021 02:45:30 -0500 Original-Received: from mail.mojserwer.eu ([195.110.48.8]:43904) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l51zZ-0001E8-Bi for help-gnu-emacs@gnu.org; Thu, 28 Jan 2021 02:45:28 -0500 Original-Received: from localhost (localhost [127.0.0.1]) by mail.mojserwer.eu (Postfix) with ESMTP id 2F5A9E684F; Thu, 28 Jan 2021 08:45:23 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at mail.mojserwer.eu Original-Received: from mail.mojserwer.eu ([127.0.0.1]) by localhost (mail.mojserwer.eu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Xdj3yTbb4qiI; Thu, 28 Jan 2021 08:45:14 +0100 (CET) Original-Received: from localhost (178235147178.dynamic-3-poz-k-0-1-0.vectranet.pl [178.235.147.178]) by mail.mojserwer.eu (Postfix) with ESMTPSA id 8231BE621C; Thu, 28 Jan 2021 08:45:14 +0100 (CET) In-reply-to: <87zh0zreah.fsf@web.de> Received-SPF: pass client-ip=195.110.48.8; envelope-from=mbork@mbork.pl; helo=mail.mojserwer.eu X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 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-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:127396 Archived-At: On 2021-01-23, at 14:08, Michael Heerdegen wrote: > Marcin Borkowski writes: > >> Hello everyone, >> >> I'd like to define a special-purpose major mode, derived from >> `special-mode', in such a way that the user cannot set it using M-x. >> (It is to be called via another command.) > > I wonder if that feature then does have to be defined as a regular mode > at all, or if something else would fit: if there could be some other > solution to what you want. Well, I could just use special-mode instead of a custom, derived one. But I think it would not be good practice - I assume special-mode is not to be used directly but only to create derived modes. > Second point: If it's really bad for the user to enable the mode, give > it a name like "*-helper-mode" or so, and I guess you could add > something like > > (when (called-interactively-p 'any) > (user-error "This mode is for internal use only")) > > to the mode function's body. Nice, thanks! It's not that it would be _bad_ for the user. It just doesn't make any sense. And given that people sometimes do things by accident, and not everyone knows about view-lossage etc., making it impossible/hard to turn such a mode manually seems reasonable. Best, -- Marcin Borkowski http://mbork.pl