From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Pedro Andres Aranda Gutierrez Newsgroups: gmane.emacs.devel Subject: Re: Arguing for a nilp function and where to put it Date: Sat, 1 Apr 2023 09:09:22 +0200 Message-ID: References: <831ql416bp.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="2901"; mail-complaints-to="usenet@ciao.gmane.io" Cc: emacs-devel@gnu.org To: Eli Zaretskii Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Apr 01 09:10:23 2023 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 1piVNX-0000Yy-Iq for ged-emacs-devel@m.gmane-mx.org; Sat, 01 Apr 2023 09:10:23 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1piVN4-00081y-4T; Sat, 01 Apr 2023 03:09:54 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1piVN2-00081a-1n for emacs-devel@gnu.org; Sat, 01 Apr 2023 03:09:52 -0400 Original-Received: from mail-ed1-x536.google.com ([2a00:1450:4864:20::536]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1piVN0-00029k-I6; Sat, 01 Apr 2023 03:09:51 -0400 Original-Received: by mail-ed1-x536.google.com with SMTP id eg48so98220824edb.13; Sat, 01 Apr 2023 00:09:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; t=1680332988; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=XqDCN9ssQuidYixo0FHhBA8LWIPjF3YYhOhrHLPVKhM=; b=HPKN0FRHtctZXRK07e4j3GFv6W9n2ynGJ+2XYkHto/H6v9Y5v2zwVW9e2QV9GjpQgv Y/wPAFo3oy57zEKhsxtRkVXkTwzdpnIC/22ix2Ori+KVoc7/cTordAJV/HVYsu91FwwN Yt+PEnXaUUqETcECF9BWAt6tS/oLpvF5DZSqnmJVM1wP6usvQ3MIFwR1R0ZcsDWlqIIe V+9HFRWWBVG3QprgKy8Qd1MyCO/CIxZ5ru6CZhR+vfeXNLXlU2qe5RIIaZLoE3gLWY7F gHWDuSqwlCJ7wvBcVPuenk426fNXECC0gUHdFARMpiBzUWSlLjY7baXjDc4Rx855OWiU nJ/g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1680332988; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=XqDCN9ssQuidYixo0FHhBA8LWIPjF3YYhOhrHLPVKhM=; b=RxodjPKJ3AY76IXCtZAdz4XBptyPmg3Gog5vmXCCL6Xb97TIaMf8kAqKudt7O7sgiW w4evhcwAYFAsYRLCDWEBlGAiTFy7KL2ALVKp8LLL1NwekolRCYfIaLFa9ONckfC/+e8b r3eXSTVkK9ftji3vREdGsSgfG5mV3nK9GnzC3fOTxZTT9V1PgB/gcA6EG2LTUIHqGvrh O9QH7e0UEPmN3NmR1t68ZJ7jZwOiej1ZKtnw/RiZV8ruD9HMIwKy0FitwORVtLvWTZMK X5mJQv4DZg5YmJYgLY+I05XTGS0sal8nXfrY6XxWE58zdwoygn9yC1XpFaiZnAp49MCy MBOA== X-Gm-Message-State: AAQBX9f5hoLqf4XKjKn8/+6nTvM4us0Ivtl10p7S4eezg0+I60uBy+42 EHleXaW7cbV7ASckQ1Y7NW9UBRB/jspG7lpAJcmReJi6HOE= X-Google-Smtp-Source: AKy350a1EEMiTGCzIyHa7DGdBYIZZuArGeRsb1h+0sumQzurfr4j2S/1Od/Pl2o9JgsRYiZsOX3ojGps6TPZx86QeKE= X-Received: by 2002:a17:907:8688:b0:931:c1a:b526 with SMTP id qa8-20020a170907868800b009310c1ab526mr15147095ejc.5.1680332988304; Sat, 01 Apr 2023 00:09:48 -0700 (PDT) In-Reply-To: <831ql416bp.fsf@gnu.org> Received-SPF: pass client-ip=2a00:1450:4864:20::536; envelope-from=paaguti@gmail.com; helo=mail-ed1-x536.google.com 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, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=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: 2.1.29 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-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:304972 Archived-At: Hi Eli, it might be that sometimes I'd like a bit more of logic... When you want to check if a variable is an integer, you use integerp, when you want to check if a variable is a string, you use stringp, etc. so I was expecting, in pure logic and in the frenzy of real life, that when you want to check if a variable is nil, you use nilp So, null is an outlier... no problem, can live with that... intuition failed me RTFM... Anyway, thx /PA On Sat, 1 Apr 2023 at 08:09, Eli Zaretskii wrote: > > > From: Pedro Andres Aranda Gutierrez > > Date: Sat, 1 Apr 2023 07:37:44 +0200 > > > > Use case for a nilp function: > > > > I have a buffer-local variable with a default value, and I want to > > allow to (silently) set it to nil (and only to nil) from > > .dir-locals.el or Local Variables. > > > > Currently I have > > > > (defun nilp(v) (unless v t)) > > > > and I use it with > > > > (put ' 'safe-local-variable #'nilp) > > > > which is much cleaner than > > > > (put ' 'safe-local-variable (lambda (p) (unless p t))) > > > > every time I need it. I think other people may benefit from having > > this simple function as part of Emacs and I'm not sure whether the > > elisp form would be better than something more lower level like > > integerp and in which file it would reside best. > > Why cannot you use the existing function 'null'? > > If 'null' doesn't fit the bill, please explain why. -- Fragen sind nicht da um beantwortet zu werden, Fragen sind da um gestellt zu werden Georg Kreisler Headaches with a Juju log: unit-basic-16: 09:17:36 WARNING juju.worker.uniter.operation we should run a leader-deposed hook here, but we can't yet