From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Juri Linkov Newsgroups: gmane.emacs.bugs Subject: bug#51247: 28.0.60; Insufficient documentation of tab-bar.el internal functions Date: Thu, 21 Oct 2021 20:27:03 +0300 Organization: LINKOV.NET Message-ID: <8735ouz3ub.fsf@mail.linkov.net> References: <831r4kghcu.fsf@gnu.org> <83h7dffnlc.fsf@gnu.org> <87a6j7v3e2.fsf@mail.linkov.net> <83bl3mftqm.fsf@gnu.org> <87czo2peob.fsf@mail.linkov.net> <83a6j6e1d4.fsf@gnu.org> <87wnmal1u8.fsf@mail.linkov.net> <838ryqe0ll.fsf@gnu.org> <837deae081.fsf@gnu.org> <8735oyl10i.fsf@mail.linkov.net> <835ytudzky.fsf@gnu.org> <87ee8ijljn.fsf@mail.linkov.net> <834k9edyra.fsf@gnu.org> <871r4hldq8.fsf@mail.linkov.net> <83lf2pcj4h.fsf@gnu.org> <8735ow7rx4.fsf@mail.linkov.net> <83sfwwapzd.fsf@gnu.org> <87ee8f1vyq.fsf@mail.linkov.net> <831r4eab9m.fsf@gnu.org> <87ee8e1lap.fsf@mail.linkov.net> <83mtn28fpa.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="20551"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (x86_64-pc-linux-gnu) Cc: 51247@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Thu Oct 21 19:29:12 2021 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 1mdbsO-000569-5R for geb-bug-gnu-emacs@m.gmane-mx.org; Thu, 21 Oct 2021 19:29:12 +0200 Original-Received: from localhost ([::1]:54456 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mdbsM-0006BW-4P for geb-bug-gnu-emacs@m.gmane-mx.org; Thu, 21 Oct 2021 13:29:10 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:34078) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mdbsF-0006BF-Jj for bug-gnu-emacs@gnu.org; Thu, 21 Oct 2021 13:29:03 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:46921) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1mdbsE-0005Tf-A2 for bug-gnu-emacs@gnu.org; Thu, 21 Oct 2021 13:29:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1mdbsE-0007Ph-4f for bug-gnu-emacs@gnu.org; Thu, 21 Oct 2021 13:29:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Juri Linkov Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 21 Oct 2021 17:29:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 51247 X-GNU-PR-Package: emacs Original-Received: via spool by 51247-submit@debbugs.gnu.org id=B51247.163483731428453 (code B ref 51247); Thu, 21 Oct 2021 17:29:02 +0000 Original-Received: (at 51247) by debbugs.gnu.org; 21 Oct 2021 17:28:34 +0000 Original-Received: from localhost ([127.0.0.1]:58466 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1mdbrm-0007Or-9V for submit@debbugs.gnu.org; Thu, 21 Oct 2021 13:28:34 -0400 Original-Received: from relay7-d.mail.gandi.net ([217.70.183.200]:34299) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1mdbrl-0007Og-JK for 51247@debbugs.gnu.org; Thu, 21 Oct 2021 13:28:33 -0400 Original-Received: (Authenticated sender: juri@linkov.net) by relay7-d.mail.gandi.net (Postfix) with ESMTPSA id 2BFC82000A; Thu, 21 Oct 2021 17:28:26 +0000 (UTC) In-Reply-To: <83mtn28fpa.fsf@gnu.org> (Eli Zaretskii's message of "Thu, 21 Oct 2021 20:12:33 +0300") X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:217788 Archived-At: >> (add-hook 'tab-bar-format 'ignore 1) >> >> and everything still works fine. > > I'm afraid this doesn't help me. The doc strings says: > > Every item in the list is a function that returns > a string, or a list of menu-item elements, or nil. > > I now have a good idea what to say about return values that are > strings and those that are lists of menu items. What do I say about > return values of nil? what is their effect on the tab bar's > appearance? Are you saying that there's no effect whatsoever? The nil value is supported only for the case when a function is on the tab-bar-format list, but its return value depends on some variable, and on some conditions might return nil. An example is tab-bar-format-history: when tab-bar-history-mode is nil, then tab-bar-format-history returns nil, but it doesn't break the tab bar.