From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Roland Winkler Newsgroups: gmane.emacs.devel Subject: Re: case-insensitive string comparison Date: Tue, 19 Jul 2022 14:39:32 -0500 Message-ID: <87ilnsq4cr.fsf@gnu.org> References: Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="28536"; mail-complaints-to="usenet@ciao.gmane.io" To: emacs-devel@gnu.org Cancel-Lock: sha1:fFj7Pj0B8B7CNoVeKg/bVaFbwyY= Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Tue Jul 19 21:42:19 2022 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 1oDt6p-0007H7-AI for ged-emacs-devel@m.gmane-mx.org; Tue, 19 Jul 2022 21:42:19 +0200 Original-Received: from localhost ([::1]:56670 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oDt6n-0000o0-Tq for ged-emacs-devel@m.gmane-mx.org; Tue, 19 Jul 2022 15:42:17 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:35968) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oDt4J-0006WZ-5l for emacs-devel@gnu.org; Tue, 19 Jul 2022 15:39:43 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:32930) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oDt4H-0000Ac-Qz for emacs-devel@gnu.org; Tue, 19 Jul 2022 15:39:42 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1oDt4D-0003px-Lw for emacs-devel@gnu.org; Tue, 19 Jul 2022 21:39:37 +0200 X-Injected-Via-Gmane: http://gmane.org/ Received-SPF: pass client-ip=116.202.254.214; envelope-from=ged-emacs-devel@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=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 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:292292 Archived-At: On Tue, Jul 19 2022, Sam Steingold wrote: > Specifically, I would like to add > > (defun string-equal-ignore-case (s1 s2) > "Like `string-equal', but case-insensitive. > Upper-case and lower-case letters are treated as equal. > Unibyte strings are converted to multibyte for comparison." > (eq t (compare-strings s1 0 nil s2 0 nil t))) > > to subr.el next to `string-prefix-p' - is this okay? I have run into this problem fairly often that I needed case-insensitive string comparison, and I believe various elisp packages include a "private" version of the above. I always felt that `(eq t (compare-strings s1 0 nil s2 0 nil t))' was a crutch for this common problem. Would it make sense to give the built-in function string-equal an optional arg ignore-case?