From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Drew Adams Newsgroups: gmane.emacs.bugs Subject: bug#69079: [PATCH] Add 'customize-toggle-option' command Date: Mon, 12 Feb 2024 18:41:39 +0000 Message-ID: References: <87frxx37wq.fsf@posteo.net> <86plx1r2uq.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="18997"; mail-complaints-to="usenet@ciao.gmane.io" Cc: "69079@debbugs.gnu.org" <69079@debbugs.gnu.org> To: Eli Zaretskii , Philip Kaludercic Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Mon Feb 12 19:42:55 2024 Return-path: Envelope-to: geb-bug-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 1rZbGZ-0004kt-IR for geb-bug-gnu-emacs@m.gmane-mx.org; 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With a prefix arg you can toggle options and other variables whose values are generalized Booleans: `nil' or non-`nil' (not just `t'). This is for toggling an option's current value; it does only this: (set SYMBOL (not (eval SYMBOL))). But the completion predicate determines the proper candidates (depending on prefix arg). There are (rightfully) many options whose values are `nil' for false and non-`nil' for true. If the command didn't let you toggle such options (with a prefix arg) then it would be _far_ less useful. ___ Doc string: Toggle option's value. This makes sense for binary (toggle) options. By default, completion candidates are limited to user options that have `boolean' custom types. However, there are many "binary" options that allow other non-nil values than t. You can use a prefix argument to change the set of completion candidates, as follows: - With a non-negative prefix arg, all user options are candidates. - With a negative prefix arg, all variables are candidates.