From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp1 ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms11 with LMTPS id qPrjCqR0rV7IKwAA0tVLHw (envelope-from ) for ; Sat, 02 May 2020 13:24:52 +0000 Received: from aspmx1.migadu.com ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp1 with LMTPS id IInaHK50rV4oOgAAbx9fmQ (envelope-from ) for ; Sat, 02 May 2020 13:25:02 +0000 Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:470:142::17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by aspmx1.migadu.com (Postfix) with ESMTPS id 9DD5B94030E for ; Sat, 2 May 2020 13:25:00 +0000 (UTC) Received: from localhost ([::1]:51716 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jUs8a-0007vz-QG for larch@yhetil.org; Sat, 02 May 2020 09:25:00 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:44726) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jUs7W-00078M-70 for emacs-orgmode@gnu.org; Sat, 02 May 2020 09:23:54 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.90_1) (envelope-from ) id 1jUs7V-0004Rg-3G for emacs-orgmode@gnu.org; Sat, 02 May 2020 09:23:53 -0400 Received: from relay9-d.mail.gandi.net ([217.70.183.199]:53021) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jUs7U-0004Hd-J2 for emacs-orgmode@gnu.org; Sat, 02 May 2020 09:23:52 -0400 X-Originating-IP: 185.131.40.67 Received: from localhost (40-67.ipv4.commingeshautdebit.fr [185.131.40.67]) (Authenticated sender: admin@nicolasgoaziou.fr) by relay9-d.mail.gandi.net (Postfix) with ESMTPSA id 65EBFFF805; Sat, 2 May 2020 13:23:47 +0000 (UTC) From: Nicolas Goaziou To: Christian Heinrich Subject: Re: Possible bug in subtree matching with empty title + tags References: <03f1df447c14a414a4eb143b7055fed3f6afb234.camel@gladbachcity.de> Mail-Followup-To: Christian Heinrich , emacs-orgmode Date: Sat, 02 May 2020 15:23:46 +0200 In-Reply-To: <03f1df447c14a414a4eb143b7055fed3f6afb234.camel@gladbachcity.de> (Christian Heinrich's message of "Sat, 02 May 2020 14:49:35 +0200") Message-ID: <87a72q79nh.fsf@nicolasgoaziou.fr> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Received-SPF: pass client-ip=217.70.183.199; envelope-from=mail@nicolasgoaziou.fr; helo=relay9-d.mail.gandi.net X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/02 09:23:48 X-ACL-Warn: Detected OS = Linux 3.11 and newer [fuzzy] X-Received-From: 217.70.183.199 X-BeenThere: emacs-orgmode@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "General discussions about Org-mode." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: emacs-orgmode Errors-To: emacs-orgmode-bounces+larch=yhetil.org@gnu.org Sender: "Emacs-orgmode" X-Scanner: scn0 X-Spam-Score: -1.01 Authentication-Results: aspmx1.migadu.com; dkim=none; dmarc=none; spf=pass (aspmx1.migadu.com: domain of emacs-orgmode-bounces@gnu.org designates 2001:470:142::17 as permitted sender) smtp.mailfrom=emacs-orgmode-bounces@gnu.org X-Scan-Result: default: False [-1.01 / 13.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; GENERIC_REPUTATION(0.00)[-0.49497347597539]; HAS_XOIP(0.00)[]; DWL_DNSWL_FAIL(0.00)[2001:470:142::17:server fail]; R_SPF_ALLOW(-0.20)[+ip6:2001:470:142::/48:c]; IP_REPUTATION_HAM(0.00)[asn: 22989(0.15), country: US(-0.00), ip: 2001:470:142::17(-0.49)]; TO_DN_ALL(0.00)[]; MX_GOOD(-0.50)[cached: eggs.gnu.org]; RCPT_COUNT_TWO(0.00)[2]; MAILLIST(-0.20)[mailman]; FORGED_RECIPIENTS_MAILLIST(0.00)[]; RCVD_IN_DNSWL_FAIL(0.00)[2001:470:142::17:server fail]; RCVD_TLS_LAST(0.00)[]; R_DKIM_NA(0.00)[]; ASN(0.00)[asn:22989, ipnet:2001:470:142::/48, country:US]; MID_RHS_MATCH_FROM(0.00)[]; TAGGED_FROM(0.00)[larch=yhetil.org]; ARC_NA(0.00)[]; RCVD_COUNT_FIVE(0.00)[6]; FROM_NEQ_ENVFROM(0.00)[mail@nicolasgoaziou.fr,emacs-orgmode-bounces@gnu.org]; FROM_HAS_DN(0.00)[]; URIBL_BLOCKED(0.00)[gladbachcity.de:email]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; DMARC_NA(0.00)[nicolasgoaziou.fr]; HAS_LIST_UNSUB(-0.01)[]; FORGED_SENDER_MAILLIST(0.00)[] X-TUID: tk1dUEtXw6h8 Hello, Christian Heinrich writes: > I'm often using empty header titles that only contain tags, such as > >> ** :foo: > > In my case, this is sufficient (for instance for flashcards, where I never have to actually have to > use the agenda etc.). However, since Nicolas's refactoring in > be31a0c4595a6d68b03b5cfbcbcdbf2cd76d2b7f empty titles seem to be prohibited. In the above example, > using subtrees (C-/ m) on the "foo" tag will return nothing, even though the tag is in the file. Is > this a deliberate change? I didn't see a note in the manual saying that headings must not be empty > (this might be useful then). This is not totally about empty headings, which are fine in Org. Your example is ambiguous. Is it an empty headline with tags, or a headline titled ":foo:" with no tag? Since we cannot support both, choosing one breaks support for the other. You could use, e.g., a NO-BREAK SPACE character in your headline and lift the ambiguity. This is not a change, but rather and undefined corner-case. There was a discussion about it a couple of years ago, IIRC. I don't remember what the outcome was. Regards, -- Nicolas Goaziou