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.help Subject: RE: Cycle Org Shift Select Date: Wed, 11 Nov 2020 09:09:25 -0800 (PST) Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="11188"; mail-complaints-to="usenet@ciao.gmane.io" Cc: Help Gnu Emacs To: Noam Postavsky , Christopher Dimech Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Wed Nov 11 18:10:22 2020 Return-path: Envelope-to: geh-help-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 1kctdW-0002n8-6G for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 11 Nov 2020 18:10:22 +0100 Original-Received: from localhost ([::1]:48148 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kctdV-0007Av-8J for geh-help-gnu-emacs@m.gmane-mx.org; 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envelope-from=drew.adams@oracle.com; helo=userp2120.oracle.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/11 12:09:43 X-ACL-Warn: Detected OS = Linux 3.1-3.10 [fuzzy] X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:125233 Archived-At: > > (defun Org-Shftsel-Cycle () > > (interactive) > > (setq org-support-shift-select > > (cadr (memq org-support-shift-select '(nil t always nil))))) >=20 > Elegant Lisp, IMO! A good idiom. > ___ >=20 >=20 > Slightly cuter: the last nil isn't needed, since (car nil) =3D nil. >=20 > (defvar toto nil) >=20 > (defun foo () > (interactive) > (setq toto (cadr (memq toto '(nil t always)))) > (message "NOW: %s" toto)) >=20 > Of if you want to show also what'll come next: >=20 > (defun foo () > (interactive) > (let ((xs '(nil t always)) > next) > (setq toto (cadr (memq toto xs)) > next (cadr (memq toto xs))) > (message "NOW: %s, NEXT: %s" toto next))) On the other hand, if you want to be able to go either forward or backward then you might want to use a ring (as defined in standard library ring.el): (defvar ring (ring-convert-sequence-to-ring '(nil t always))) (defvar current nil) (defun next () (interactive) (setq current (ring-next toto current)) (message "NOW: %s" current)) (defun previous () (interactive) (setq current (ring-previous toto current)) (message "NOW: %s" current))