From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: empty-directory predicate, native implementation Date: Wed, 14 Oct 2020 19:29:38 +0300 Message-ID: <83a6wozs7h.fsf@gnu.org> References: <83y2ka18t7.fsf@gnu.org> <87y2kaj799.fsf@gmx.de> <83blh60wgr.fsf@gnu.org> <87h7qxjh7g.fsf@gmx.de> <878sc8kgy8.fsf@gmx.de> <87imbcls71.fsf@gmx.de> <83eem0zt0b.fsf@gnu.org> <87k0vsrd6m.fsf@gmx.de> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="9412"; mail-complaints-to="usenet@ciao.gmane.io" Cc: arthur.miller@live.com, emacs-devel@gnu.org To: Michael Albinus Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed Oct 14 18:49:56 2020 Return-path: Envelope-to: ged-emacs-devel@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 1kSjyO-0002Le-7R for ged-emacs-devel@m.gmane-mx.org; Wed, 14 Oct 2020 18:49:56 +0200 Original-Received: from localhost ([::1]:56018 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kSjyN-0005j9-9c for ged-emacs-devel@m.gmane-mx.org; Wed, 14 Oct 2020 12:49:55 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:36236) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kSjea-0006yr-2B for emacs-devel@gnu.org; Wed, 14 Oct 2020 12:29:28 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:60579) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kSjeY-0004j0-NT; Wed, 14 Oct 2020 12:29:26 -0400 Original-Received: from [176.228.60.248] (port=2432 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1kSjeY-00058q-6A; Wed, 14 Oct 2020 12:29:26 -0400 In-Reply-To: <87k0vsrd6m.fsf@gmx.de> (message from Michael Albinus on Wed, 14 Oct 2020 18:21:21 +0200) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:257659 Archived-At: > From: Michael Albinus > Cc: arthur.miller@live.com, emacs-devel@gnu.org > Date: Wed, 14 Oct 2020 18:21:21 +0200 > > Eli Zaretskii writes: > > > I think 0 doesn't make much sense, so we might as well not support > > that at all. > > In general, I agree. Calling directory-files with COUNT being 0, > literally, doesn't make sense. But COUNT could be the result of some > arithmetics, and instead urging the caller to test it, we could simply > return nil. Which is correct, reading nil as the empty list. > > And it doesn't cost us anything. I'm okay with interpreting "don't support" as "return nil".