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: Searching for line beginning Date: Sun, 14 Aug 2022 18:36:52 +0300 Message-ID: <83pmh2kfaj.fsf@gnu.org> References: <831qtkm9ni.fsf@gnu.org> <878rnqq1qr.fsf@tcd.ie> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="19501"; mail-complaints-to="usenet@ciao.gmane.io" Cc: emacs-devel@gnu.org To: "Basil L. Contovounesios" Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sun Aug 14 17:37:44 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 1oNFgN-0004vE-Od for ged-emacs-devel@m.gmane-mx.org; Sun, 14 Aug 2022 17:37:43 +0200 Original-Received: from localhost ([::1]:59212 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oNFgM-00023S-8e for ged-emacs-devel@m.gmane-mx.org; Sun, 14 Aug 2022 11:37:42 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:54184) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oNFfp-0001LZ-R4 for emacs-devel@gnu.org; Sun, 14 Aug 2022 11:37:09 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:46266) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oNFfp-0004jb-Db; Sun, 14 Aug 2022 11:37:09 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=References:Subject:In-Reply-To:To:From:Date: mime-version; bh=4HVllaYsDuHHmYFRABjGq8Dx/RFkepNl1sDQxUCCQa4=; b=BRE4YWmD97fS DrWTf1hzZFWThrsgNSEoC9InHFcafAoIA96zjjqPYzkR2xOQcuHEkLShBDVqtE0yLkgdd27SXeNnj XnhCEAsZTjAQYxI25gIx90KKkqYhSVlKnmB9K44/aIh4sZOgjZkUdBYI2WsY4v7Zv16azvIVnWTpN M/QzQO1OjmGCYXvTTeopsz0JVEh5cbNbClPoBhTxMhPMO//QwiNNtQvJs0Cgg7WGm0EChjQ7zOCIV iPB6vK65O4GudGdL1qUesfKxaNgwALXXCaaOmbinqGCpxOoTyfRv7aFYH0HTlmEvaOzJcZ4q6Y8h8 ytxnBjZVZfp5VLU8XgFiiA==; Original-Received: from [87.69.77.57] (port=1340 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oNFfo-0002uL-Tf; Sun, 14 Aug 2022 11:37:09 -0400 In-Reply-To: <878rnqq1qr.fsf@tcd.ie> (contovob@tcd.ie) 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:293448 Archived-At: > From: "Basil L. Contovounesios" > Cc: emacs-devel@gnu.org > Date: Sun, 14 Aug 2022 18:33:00 +0300 > > Eli Zaretskii [2022-08-13 18:43 +0300] wrote: > > > C-a (move-beginning-of-line) does this to find the line's beginning: > > > > ;; Move to beginning-of-line, ignoring fields and invisible text. > > (skip-chars-backward "^\n") > > (while (and (not (bobp)) (invisible-p (1- (point)))) > > (goto-char (previous-char-property-change (point))) > > (skip-chars-backward "^\n")) > > > > Apart of the fields part (which can be handled by binding > > inhibit-field-text-motion), can anyone see a reason why not use > > line-beginning-position instead? The latter is much faster, > > especially when lines are very long. > > FWIW, one could also say (beginning-of-line) or (beginning-of-line 1) > instead of (goto-char (line-beginning-position)). As a matter of principle, I don't like calling commands from Lisp if I can avoid that, because commands frequently have extensive checks of the arguments that are redundant in non-interactive calls.