From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Ihor Radchenko Newsgroups: gmane.emacs.devel Subject: Re: Making Emacs Lisp easier to debug Date: Sat, 11 Nov 2023 09:01:51 +0000 Message-ID: <878r748xz4.fsf@localhost> References: <838r74ye77.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="6524"; mail-complaints-to="usenet@ciao.gmane.io" Cc: Alan Mackenzie , emacs-devel@gnu.org To: Eli Zaretskii Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Nov 11 10:00:35 2023 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 1r1jr1-0001Xa-SL for ged-emacs-devel@m.gmane-mx.org; Sat, 11 Nov 2023 10:00:35 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1r1jqK-0003gJ-II; Sat, 11 Nov 2023 03:59:52 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1r1jqJ-0003g4-B5 for emacs-devel@gnu.org; Sat, 11 Nov 2023 03:59:51 -0500 Original-Received: from mout02.posteo.de ([185.67.36.66]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1r1jqH-0001qd-Fg for emacs-devel@gnu.org; Sat, 11 Nov 2023 03:59:51 -0500 Original-Received: from submission (posteo.de [185.67.36.169]) by mout02.posteo.de (Postfix) with ESMTPS id 816D5240101 for ; Sat, 11 Nov 2023 09:59:46 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.net; s=2017; t=1699693186; bh=5U1ZeQAZc0iXKHFi6fqgkY8f5KKX1NTaU3gHEgCZmR0=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:From; b=CtT+i5zQfmmUkcH4c1olyOzHKuaNPktA8yo0PMG+y0QbtZ+CHddzEgDgtjTSwSqq9 bURDe9o2Dr4rySwyPaOESXCG976DtiwX7K2wZJ3DA/j4DcyQHIZE2wxpRtPEmmGiVQ Tpn6Q38qn9dmg7wYpiOIf7BNB5XnLEmlh0OEJa0Oosbn5O8IyXyvOvyJVcN+eAHt3q 7yA4/kd0iqVZe290lc6rU1PBsgLg2nI4nooLwQHMiaaZPrcHfAEZP5tBV5OTGdE0YH prRdotZIoipyOv5TH6TvmKlu3SOvyS2wjxNzg3XLGbHCKYjoHr33lVPNfTrFnkBC6m /Z+P0WyRB1Skg== Original-Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4SS8lP4jBWz6tm4; Sat, 11 Nov 2023 09:59:45 +0100 (CET) In-Reply-To: <838r74ye77.fsf@gnu.org> Received-SPF: pass client-ip=185.67.36.66; envelope-from=yantar92@posteo.net; helo=mout02.posteo.de X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action 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-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:312534 Archived-At: Eli Zaretskii writes: >> (ii) Edebugging font locking code. It would be nice to be able to debug >> font locking code which is being called from redisplay, as well as other >> hooks which are also called from redisplay. At the moment this isn't >> possible. To make it possible would require redisplay to become >> reentrant, so that a frame or window in the inner redisplay call >> could be where debugging of the outer redisplay call happens. I don't >> know how practicable it would be to enhance redisplay for this (it is >> certainly possible). Has anybody ever looked into this before? > > Yes, see jit-lock-debug-mode. (It's described in the ELisp manual.) Also, I found built-in M-x font-lock-debug-fontify helpful. And third-party package https://github.com/Lindydancer/font-lock-studio Finally, `backtrace-on-redisplay-error' is useful. -- Ihor Radchenko // yantar92, Org mode contributor, Learn more about Org mode at . Support Org development at , or support my work at