From mboxrd@z Thu Jan  1 00:00:00 1970
Path: news.gmane.org!.POSTED!not-for-mail
From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.devel
Subject: Re: Should mode commands be idempotent?
Date: Tue, 19 Sep 2017 23:10:44 -0400
Message-ID: <jwvshfiysjj.fsf-monnier+gmane.emacs.devel@gnu.org>
References: <CAArVCkS=SCpniiaf_WuruLRhqCWiORKHus4cff=w++8_GSpQ2w@mail.gmail.com>
	<b8ac2adc-6339-4ac5-9556-e03686804539@default>
NNTP-Posting-Host: blaine.gmane.org
Mime-Version: 1.0
Content-Type: text/plain
X-Trace: blaine.gmane.org 1505877326 6890 195.159.176.226 (20 Sep 2017 03:15:26 GMT)
X-Complaints-To: usenet@blaine.gmane.org
NNTP-Posting-Date: Wed, 20 Sep 2017 03:15:26 +0000 (UTC)
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux)
To: emacs-devel@gnu.org
Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Wed Sep 20 05:15:20 2017
Return-path: <emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org>
Envelope-to: ged-emacs-devel@m.gmane.org
Original-Received: from lists.gnu.org ([208.118.235.17])
	by blaine.gmane.org with esmtp (Exim 4.84_2)
	(envelope-from <emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org>)
	id 1duVTp-0001L3-Kz
	for ged-emacs-devel@m.gmane.org; Wed, 20 Sep 2017 05:15:17 +0200
Original-Received: from localhost ([::1]:46425 helo=lists.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org>)
	id 1duVTx-0006eo-2O
	for ged-emacs-devel@m.gmane.org; Tue, 19 Sep 2017 23:15:25 -0400
Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:38527)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <ged-emacs-devel@m.gmane.org>) id 1duVTq-0006dS-JI
	for emacs-devel@gnu.org; Tue, 19 Sep 2017 23:15:19 -0400
Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <ged-emacs-devel@m.gmane.org>) id 1duVTn-0002WB-GJ
	for emacs-devel@gnu.org; Tue, 19 Sep 2017 23:15:18 -0400
Original-Received: from [195.159.176.226] (port=49030 helo=blaine.gmane.org)
	by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16)
	(Exim 4.71) (envelope-from <ged-emacs-devel@m.gmane.org>)
	id 1duVTn-0002Sk-9K
	for emacs-devel@gnu.org; Tue, 19 Sep 2017 23:15:15 -0400
Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2)
	(envelope-from <ged-emacs-devel@m.gmane.org>) id 1duVTb-0000ho-TG
	for emacs-devel@gnu.org; Wed, 20 Sep 2017 05:15:03 +0200
X-Injected-Via-Gmane: http://gmane.org/
Original-Lines: 7
Original-X-Complaints-To: usenet@blaine.gmane.org
Cancel-Lock: sha1:TMphReaP1rD0PXZLAulhQXd/0s0=
X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic]
	[fuzzy]
X-Received-From: 195.159.176.226
X-BeenThere: emacs-devel@gnu.org
X-Mailman-Version: 2.1.21
Precedence: list
List-Id: "Emacs development discussions." <emacs-devel.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/emacs-devel>,
	<mailto:emacs-devel-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/archive/html/emacs-devel/>
List-Post: <mailto:emacs-devel@gnu.org>
List-Help: <mailto:emacs-devel-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/emacs-devel>,
	<mailto:emacs-devel-request@gnu.org?subject=subscribe>
Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org
Original-Sender: "Emacs-devel" <emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org>
Xref: news.gmane.org gmane.emacs.devel:218560
Archived-At: <http://permalink.gmane.org/gmane.emacs.devel/218560>

> What's the use case for such a restriction?

I'll return the question: when/why would a major-mode or a minor-mode
not want to be idempotent?  Can you cite at least one example?


        Stefan