From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Marcin Borkowski Newsgroups: gmane.emacs.help Subject: Is it ok to sort a list of overlays destructively? Date: Tue, 27 Jul 2021 07:22:42 +0200 Message-ID: <87h7ggcov1.fsf@mbork.pl> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="4647"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: mu4e 1.1.0; emacs 28.0.50 To: Help Gnu Emacs mailing list Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Tue Jul 27 07:23:28 2021 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 1m8FYu-0000yv-EV for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 27 Jul 2021 07:23:28 +0200 Original-Received: from localhost ([::1]:55298 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m8FYs-0001Nw-DU for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 27 Jul 2021 01:23:26 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:40794) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m8FYU-0001MW-4K for help-gnu-emacs@gnu.org; Tue, 27 Jul 2021 01:23:02 -0400 Original-Received: from mail.mojserwer.eu ([195.110.48.8]:42890) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m8FYP-0002mT-MG for help-gnu-emacs@gnu.org; Tue, 27 Jul 2021 01:23:01 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by mail.mojserwer.eu (Postfix) with ESMTP id DB23CE6B6E for ; Tue, 27 Jul 2021 07:22:48 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at mail.mojserwer.eu Original-Received: from mail.mojserwer.eu ([127.0.0.1]) by localhost (mail.mojserwer.eu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dfGCu3xp8D4c for ; Tue, 27 Jul 2021 07:22:44 +0200 (CEST) Original-Received: from localhost (178235147028.dynamic-3-poz-k-0-1-0.vectranet.pl [178.235.147.28]) by mail.mojserwer.eu (Postfix) with ESMTPSA id 368B3E6B6D for ; Tue, 27 Jul 2021 07:22:43 +0200 (CEST) Received-SPF: pass client-ip=195.110.48.8; envelope-from=mbork@mbork.pl; helo=mail.mojserwer.eu X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=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:132117 Archived-At: Hi all, I need to sort the list of overlays returned by `overlays-in'. The docs for that function do not says explicitly that it creates a new list every time, although a cursory glance at its source says that it apparently does. (Also, (eq (overlays-in (point-min) (point-max)) (overlays-in (point-min) (point-max))) is nil also when there are overlays in the buffer, so it seems to be the case.) OTOH, if creating a new list every time isn't in the docs, one shouldn't rely on it, no? So, is it a good practice to (sort (overlays-in (point-min) (point-max)) (lambda (o1 o2) (< (overlay-start o1) (overlay-start o2)))) ? TIA, -- Marcin Borkowski http://mbork.pl