From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Michael Heerdegen Newsgroups: gmane.emacs.help Subject: Re: Making ielm behave like a shell (getting to previous commands using the up-arrow key) Date: Fri, 18 Dec 2020 10:01:14 +0100 Message-ID: <87mtyb32ud.fsf@web.de> References: <87im91ys4m.fsf@web.de> <874kklyqi2.fsf@web.de> <87im90dq2s.fsf@web.de> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="37529"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:tWCVMYSAym5yvxEY7a6S0rZRMtQ= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Dec 18 10:02:16 2020 Return-path: Envelope-to: geh-help-gnu-emacs@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 1kqBeS-0009et-6G for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 18 Dec 2020 10:02:16 +0100 Original-Received: from localhost ([::1]:49208 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kqBeR-0008J2-6j for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 18 Dec 2020 04:02:15 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:55550) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kqBdc-0008Hx-2W for help-gnu-emacs@gnu.org; Fri, 18 Dec 2020 04:01:24 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]:45048) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kqBda-0003V7-F9 for help-gnu-emacs@gnu.org; Fri, 18 Dec 2020 04:01:23 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1kqBdX-0008ZA-9W for help-gnu-emacs@gnu.org; Fri, 18 Dec 2020 10:01:19 +0100 X-Injected-Via-Gmane: http://gmane.org/ Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -13 X-Spam_score: -1.4 X-Spam_bar: - X-Spam_report: (-1.4 / 5.0 requ) BAYES_00=-1.9, FREEMAIL_FORGED_FROMDOMAIN=0.249, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.25, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 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-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:126483 Archived-At: Jean Louis writes: > That is how I learned it, instruction was somewhere on how to debug > and I used to do it much in Common Lisp that way. I must admit that I did not exhaustively understand how you proceed because the code examples you had posted are broken (let binding syntax broken). > When you have > > (let ((some 1) > (more 2)) > > How do you go about debugging such function? Sometimes I insert `message' calls or something more sophisticated to output values. That's the simplest tool. And then, sure, edebug and the built-in debugger - they allow inspecting values live so there is no need to change the environment unless you need to save a value for later inspection or reuse. > Emacs has instrumenting of functions which can help and which is > similar to setting each variable one by one with setq or setq-local Similar, but actually much cooler since Edebug and the debugger have real access to the debugged environment. > What is your way of debugging it? Depends on "it". Apart from the above ways `debug-on-variable-change' comes handy when you don't know where a binding changes. Sometimes I'm also using the tracer to trace variable bindings - one can implement that easily using (the quite new) variable watchers. Regards, Michael.