From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Helmut Eller Newsgroups: gmane.emacs.devel Subject: Re: xref backends for elisp-related modes Was: Re: Bad moves with xref-find-definitions Date: Wed, 29 Apr 2015 08:55:24 +0200 Message-ID: References: <87h9s6c27z.fsf@gmail.com> <87zj5wnlyt.fsf@gmail.com> <553C285B.4070400@yandex.ru> <838udfx7rt.fsf@gnu.org> <87383kcy0u.fsf@gmail.com> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1430290552 18694 80.91.229.3 (29 Apr 2015 06:55:52 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 29 Apr 2015 06:55:52 +0000 (UTC) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Wed Apr 29 08:55:45 2015 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1YnLuK-0004PE-5S for ged-emacs-devel@m.gmane.org; Wed, 29 Apr 2015 08:55:44 +0200 Original-Received: from localhost ([::1]:37284 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YnLuJ-0005Cl-Hn for ged-emacs-devel@m.gmane.org; Wed, 29 Apr 2015 02:55:43 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:58830) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YnLuE-0005Cd-Kx for emacs-devel@gnu.org; Wed, 29 Apr 2015 02:55:39 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YnLu9-0004bC-9I for emacs-devel@gnu.org; Wed, 29 Apr 2015 02:55:38 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:42620) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YnLu8-0004b8-IX for emacs-devel@gnu.org; Wed, 29 Apr 2015 02:55:32 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1YnLu6-0004Fh-44 for emacs-devel@gnu.org; Wed, 29 Apr 2015 08:55:30 +0200 Original-Received: from dial-185099.pool.broadband44.net ([212.46.185.99]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 29 Apr 2015 08:55:30 +0200 Original-Received: from eller.helmut by dial-185099.pool.broadband44.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 29 Apr 2015 08:55:30 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 16 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: dial-185099.pool.broadband44.net User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) Cancel-Lock: sha1:+gpgPhVyzERyMa2b6jeRErr2yBw= X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 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.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:185999 Archived-At: On Tue, Apr 28 2015, Vitalie Spinu wrote: > Maybe obvious, but this struggle with the choice of the > default backend wouldn't be there if xref was able to merge backends. My original proposal had a xref-location= generic function for exactly that reason: to give the front end the possibility to remove duplicates. However, this was removed because a) it complicates the front-end<->backend-end API b) everybody who can write methods for xref-location= can just as well write a backend that removes duplicates. For me those are convincing arguments too delegate duplicate removal to backends. Helmut