From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Gregory Heytings Newsgroups: gmane.emacs.devel Subject: Re: Making a key undefined again Date: Mon, 25 Oct 2021 17:48:27 +0000 Message-ID: <822aec9d01f1ec32849b@heytings.org> References: <20211004081724.6281.11798@vcs0.savannah.gnu.org> <87mtnbtimj.fsf@gnus.org> <87wnmd13ny.fsf@gnus.org> <87sfx10xs6.fsf@gnus.org> <87h7dfpjn3.fsf@gnus.org> <31b2f1e94178d73e5f05@heytings.org> <87czo3pgs1.fsf@gnus.org> <31b2f1e9412d60db82df@heytings.org> <87o87moopl.fsf@gnus.org> <19fca5d18b63e6eff5de@heytings.org> <87wnmaiida.fsf@gnus.org> <87zgr6gw9s.fsf@gnus.org> <87r1chhhkh.fsf@gnus.org> <871r4hf83m.fsf@gnus.org> <878ryhjia1.fsf@bernoul.li> Mime-Version: 1.0 Content-Type: text/plain; format=flowed; charset=us-ascii Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="24742"; mail-complaints-to="usenet@ciao.gmane.io" Cc: Lars Ingebrigtsen , Jonas Bernoulli , Stefan Kangas , emacs-devel@gnu.org To: Stefan Monnier Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Mon Oct 25 19:52:30 2021 Return-path: Envelope-to: ged-emacs-devel@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 1mf498-0006Eh-AN for ged-emacs-devel@m.gmane-mx.org; Mon, 25 Oct 2021 19:52:30 +0200 Original-Received: from localhost ([::1]:35728 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mf496-0006xW-NZ for ged-emacs-devel@m.gmane-mx.org; Mon, 25 Oct 2021 13:52:28 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:49772) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mf45I-0000X1-Tt for emacs-devel@gnu.org; Mon, 25 Oct 2021 13:48:33 -0400 Original-Received: from heytings.org ([95.142.160.155]:38730) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mf45G-0002yK-0V for emacs-devel@gnu.org; Mon, 25 Oct 2021 13:48:32 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=heytings.org; s=20210101; t=1635184107; bh=bVb91q2hSVvxWXtbgg/u+p35HMcgX7j0lApsGgwnSsA=; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References:From; b=spUBXz87fm4I9pyW59ThL+iwcy+fqI/PvKfyaZmwR2DFFUNMil1xpFQNT04W3+r1+ gmAGVKJEj2tyG4Ved9VdjuvoxlUvPPRXDNUGgn9puyndSyT5ntvvhOqsthDdyz7Q7E CP/a4RKFfdyliD+4hJNCZRGzuX9WqUAm7pUZMSaEoD+TVm13Nyly8oujvVtq29RiGR RoYVArO/E9s51AYAG7wPfn3IikjA0CONYKODA63Y9zH2RMv8XKIqsZ99EQVmputuJs 5RUzwZo/10+bDDtSGVyHq43Vq5W7z0SGQA6UviSJ9BZTS5W5NwtBPkggumb/nRRP2K dA5fifiZ8zhYQ== In-Reply-To: Received-SPF: pass client-ip=95.142.160.155; envelope-from=gregory@heytings.org; helo=heytings.org X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:277770 Archived-At: > > Actually, it didn't make it clear for me. I hope I understand the > differences between an `undefined` binding, a `nil ` binding, and no > binding at all, but I don't know why unsetting a key is important and > even less when unsetting it by making it have no binding at all is > necessary. > I'm not sure I understand what Jonas wants, but here's what I understood: 1. (define-key lisp-interaction-mode-map "\C-j" nil) means that in *scratch* C-j becomes electric-newline-and-maybe-indent (in global-map); 2. (define-key lisp-interaction-mode-map "\C-j" #'undefined) means that in *scratch* C-j displays "C-j is undefined"; 3. (define-key lisp-interaction-mode-map "\C-j" (lambda () (interactive))) means that in *scratch* C-j does nothing.