From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Lars Ingebrigtsen Newsgroups: gmane.emacs.bugs Subject: bug#22703: 24.5; PROPOSAL: Is there a way to update available choices for defcustom variable? Date: Thu, 01 Aug 2019 14:44:22 +0200 Message-ID: <87ftmlm4wp.fsf@mouse.gnus.org> References: <871t8cfrfc.fsf@gavenkoa.example.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="143231"; mail-complaints-to="usenet@blaine.gmane.org" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) Cc: 22703@debbugs.gnu.org To: Oleksandr Gavenko Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Thu Aug 01 14:45:10 2019 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1htASD-000b8v-Tz for geb-bug-gnu-emacs@m.gmane.org; Thu, 01 Aug 2019 14:45:10 +0200 Original-Received: from localhost ([::1]:55622 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1htASC-0004Pm-UX for geb-bug-gnu-emacs@m.gmane.org; Thu, 01 Aug 2019 08:45:08 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:49373) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1htAS8-0004PG-6f for bug-gnu-emacs@gnu.org; Thu, 01 Aug 2019 08:45:05 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1htAS7-0001RZ-0L for bug-gnu-emacs@gnu.org; Thu, 01 Aug 2019 08:45:04 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:44828) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1htAS6-0001Qw-RW for bug-gnu-emacs@gnu.org; Thu, 01 Aug 2019 08:45:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1htAS6-0001sT-OE for bug-gnu-emacs@gnu.org; Thu, 01 Aug 2019 08:45:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Lars Ingebrigtsen Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 01 Aug 2019 12:45:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 22703 X-GNU-PR-Package: emacs Original-Received: via spool by 22703-submit@debbugs.gnu.org id=B22703.15646634687064 (code B ref 22703); Thu, 01 Aug 2019 12:45:02 +0000 Original-Received: (at 22703) by debbugs.gnu.org; 1 Aug 2019 12:44:28 +0000 Original-Received: from localhost ([127.0.0.1]:53644 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1htARY-0001ps-9O for submit@debbugs.gnu.org; Thu, 01 Aug 2019 08:44:28 -0400 Original-Received: from quimby.gnus.org ([80.91.231.51]:39188) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1htARW-0001pk-NR for 22703@debbugs.gnu.org; Thu, 01 Aug 2019 08:44:27 -0400 Original-Received: from 77.18.62.220.tmi.telenormobil.no ([77.18.62.220] helo=sandy) by quimby.gnus.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1htARS-0006pZ-SJ; Thu, 01 Aug 2019 14:44:25 +0200 In-Reply-To: <871t8cfrfc.fsf@gavenkoa.example.com> (Oleksandr Gavenko's message of "Tue, 16 Feb 2016 20:20:23 +0200") X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.51.188.43 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.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:164218 Archived-At: Oleksandr Gavenko writes: > Recently I ask question: > > http://emacs.stackexchange.com/questions/20350/defcustom-values-for-sel= ecting-from-function-call > > because I didn't understand show to build code from that I read in docs. > > While answer to question help me to build my first "customize" code it mi= ss > main point and I think because the way Emacs customize API works, so nobo= dy > even think about doing as I asked. > > I have values: > > (defvar my/python-checker-alist > '((pylint . (my/python-pylint-command my/python-pylint-args)) > (pep8 . (my/python-pep8-command my/python-pep8-args)) > (pyflakes . (my/python-pyflakes-command my/python-pyflakes-args))) > "Known Python source code checkers.") > > and want to build `defcustom' definition based on that values: > > (choice (const . pylint) (const . pep8) (const . pyflakes)) > > (defcustom my/python-default-checker 'pyflakes > "Default Python source code checker. See `my/python-checker-alist' fo= r full alist." > :group 'my/python > :type (cons 'choice (mapcar (lambda (e) (cons 'const (car e))) my/pyt= hon-checker-alist)) ) > > I am worrying is there a mechanic that **automatically** update `:type' v= alue when > user visit: > > M-x customize-group > M-x customize-variable > > with my variable? > > Official info states: > > The argument of =E2=80=98:type=E2=80=99 is evaluated, but only once whe= n the > =E2=80=98defcustom=E2=80=99 is executed, so it isn=E2=80=99t useful for= the value to vary. > > If someone potentially extend my/python-checker-alist his addition would = be > invisible in my/python-default-checker. > > I thing it is wrong to ask someone not only to update possible values: > > (with-eval-after-load 'my/python > (add-to-list 'my/python-checker-alist ...)) > > but also somehow to update default values (for my/python-default-checker) > synchronously. > > Are there standard convention for such situation? (I'm going through old bug reports that have unfortunately not gotten any responses.) Yes, the person extending the defcustom can call `custom-declare-variable' with the new :type, too. This should be mentioned in the doc string for `defcustom', I think, and I'm making that change on the Emacs trunk now. --=20 (domestic pets only, the antidote for overdose, milk.) bloggy blog: http://lars.ingebrigtsen.no