From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg Newsgroups: gmane.emacs.help Subject: Re: Easy to add with push but not to the end of a list Date: Sat, 31 Dec 2022 23:09:37 +0100 Message-ID: <87358vdy3i.fsf@dataswamp.org> References: <877czcid1d.fsf@web.de> <87a648kzov.fsf@dataswamp.org> <87cz93noqc.fsf@web.de> <87zgc76npf.fsf@dataswamp.org> <87k038npls.fsf@web.de> <87sfht8luq.fsf@dataswamp.org> <87h6y91ffg.fsf@web.de> <878rjlgvdd.fsf@dataswamp.org> <87bkoh1dix.fsf@web.de> <87wn75fdkx.fsf@dataswamp.org> <87bkog30ry.fsf@web.de> <87pmcwcghm.fsf@dataswamp.org> <87zgbxo5c8.fsf@web.de> <874jtfqe60.fsf@dataswamp.org> <87y1qnfr3g.fsf@web.de> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="21906"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:k9mSQH4QlLjdAbBFCLMvtz1B0Y8= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sun Jan 01 03:08:49 2023 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 1pBnmL-0005U2-9z for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 01 Jan 2023 03:08:49 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pBnlq-0006bx-Th; Sat, 31 Dec 2022 21:08:19 -0500 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 1pBk33-0007hg-2b for help-gnu-emacs@gnu.org; Sat, 31 Dec 2022 17:09:49 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pBk31-0001C5-CZ for help-gnu-emacs@gnu.org; Sat, 31 Dec 2022 17:09:48 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1pBk2z-0006Cu-7o for help-gnu-emacs@gnu.org; Sat, 31 Dec 2022 23:09:45 +0100 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Mail-Copies-To: never Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.248, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Sat, 31 Dec 2022 21:08:17 -0500 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.29 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-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.help:142074 Archived-At: Michael Heerdegen wrote: >> How do you do a `pushlast' macro? > > I would start with `push' and change the definition so that > the expansion uses an according `append' call. Like this? A lot of unfamiliar stuff it that code ... ;;; -*- lexical-binding: t -*- ;; ;; this file: ;; https://dataswamp.org/~incal/emacs-init/list.el (defmacro pushlast (newelt place) (declare (debug (form gv-place))) (if (symbolp place) (list 'setq place (list 'append place (list 'cons newelt nil)) ) (macroexp-let2 macroexp-copyable-p x newelt (gv-letplace (getter setter) place (funcall setter `(append ,getter (cons ,x nil))) )))) -- underground experts united https://dataswamp.org/~incal