From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Marcin Borkowski Newsgroups: gmane.emacs.help Subject: Re: Advice on troubleshooting function to "unscroll" Date: Mon, 26 Jan 2015 01:16:47 +0100 Message-ID: <87ppa2flao.fsf@wmi.amu.edu.pl> References: <54C5577D.4030700@gmail.com> <871tmih6w0.fsf@wmi.amu.edu.pl> <54C56827.6030802@gmail.com> <54C5748E.4060605@gmail.com> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1422231446 25393 80.91.229.3 (26 Jan 2015 00:17:26 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 26 Jan 2015 00:17:26 +0000 (UTC) To: Will Monroe , help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Mon Jan 26 01:17:26 2015 Return-path: Envelope-to: geh-help-gnu-emacs@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 1YFXMq-0001nM-9k for geh-help-gnu-emacs@m.gmane.org; Mon, 26 Jan 2015 01:17:24 +0100 Original-Received: from localhost ([::1]:39403 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YFXMp-0002M8-KQ for geh-help-gnu-emacs@m.gmane.org; Sun, 25 Jan 2015 19:17:23 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:46037) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YFXMU-0002Kx-Py for help-gnu-emacs@gnu.org; Sun, 25 Jan 2015 19:17:07 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YFXMP-0003UV-R4 for help-gnu-emacs@gnu.org; Sun, 25 Jan 2015 19:17:02 -0500 Original-Received: from msg.wmi.amu.edu.pl ([2001:808:114:2::50]:37716) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YFXMP-0003UR-K9 for help-gnu-emacs@gnu.org; Sun, 25 Jan 2015 19:16:57 -0500 Original-Received: from localhost (localhost [127.0.0.1]) by msg.wmi.amu.edu.pl (Postfix) with ESMTP id 6A7194AC58; Mon, 26 Jan 2015 01:16:56 +0100 (CET) Original-Received: from msg.wmi.amu.edu.pl ([127.0.0.1]) by localhost (msg.wmi.amu.edu.pl [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ewu2T1r65Wcg; Mon, 26 Jan 2015 01:16:56 +0100 (CET) Original-Received: from localhost (117-116.echostar.pl [213.156.117.116]) by msg.wmi.amu.edu.pl (Postfix) with ESMTPSA id C9C2E4AC52; Mon, 26 Jan 2015 01:16:55 +0100 (CET) In-reply-to: X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-Received-From: 2001:808:114:2::50 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:102269 Archived-At: On 2015-01-26, at 01:03, Drew Adams wrote: >> why did scroll-up-command work where the still useful but not >> appropriate scroll-up did not? > > That was already answered, and I thought that you understood > the answer. The problem was that the code checked whether the > current command was `scroll-up', and it of course never would > be. `scroll-up' is called by `scroll-up-command', but only the > latter, never the former, is invoked by you interactively, i.e., > as a command. Variables `this-command' and `last-command' are > only set to functions when they are invoked as commands. I think the OP did understand this, but meant to ask (more or less) "why weren't the Emacs Devs satisfied with scroll-up, which did work after all". >> And if I'm being honest about why I did not go to Edebug it's because I >> was anticipating great difficulty reading the backtrace statements. I >> thought my problem might be compounded by a more general illiteracy in >> that regard... > > The Emacs manual sends you to the Elisp manual, node `Edebug', > for information about using that debugger. That section of the > Elisp manual is like a mini-manual about Edebug. > > Why it does not send you instead to the Elisp manual node > `Debugger' (which has title "The Lisp Debugger"), I don't know. > That node covers the regular debugger (i.e., `debug'). > > `debug' is older than `edebug'. Perhaps the person who wrote > `edebug' decided to send readers of the Emacs manual to learn > about Edebug. ;-) > > (In older versions of Emacs, e.g. Emacs 20, there was no link > from the Emacs manual to the Elisp manual for either the regular > Lisp debugger or Edebug, but there were multiple mentions of > using the former - and only no mention of Edebug, except to say > that edebug.el was contributed by Daniel LaLiberte.) Drew, your answer is (as usual) very helpful and informative. Thank you for your insights and the bits about Emacs history. I think we really need Sacha Chua to do an Emacs Chat with you. I, personally, would love to learn a bit about your workflow and Emacs config. (Not that I would necessarily like to copy it: I strongly disagree with you on the window/frame issue, for instance!) Regards, -- Marcin Borkowski http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski Faculty of Mathematics and Computer Science Adam Mickiewicz University