From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: trapping process filter error in a thread Date: Tue, 22 Mar 2022 20:28:12 +0100 Message-ID: <87zglhkcs3.fsf@zoho.eu> References: <87pmmegk7a.fsf@gnuvola.org> Reply-To: Emanuel Berg Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="11890"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:u6fIVLSG3h6X692E+pghvJVayC4= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Wed Mar 23 16:07:16 2022 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 1nX2Zw-0002oK-39 for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 23 Mar 2022 16:07:16 +0100 Original-Received: from localhost ([::1]:54462 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nX2Zu-0000Va-IZ for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 23 Mar 2022 11:07:14 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:40178) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nWkB6-0007Cc-DH for help-gnu-emacs@gnu.org; Tue, 22 Mar 2022 15:28:24 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:45256) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nWkB4-0003Tk-Ug for help-gnu-emacs@gnu.org; Tue, 22 Mar 2022 15:28:24 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1nWkB2-00072B-2Y for help-gnu-emacs@gnu.org; Tue, 22 Mar 2022 20:28:20 +0100 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Mail-Copies-To: never 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: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Wed, 23 Mar 2022 11:05:05 -0400 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.29 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:136728 Archived-At: Thien-Thi Nguyen wrote: > I'm in the process of writing a dead-link checker Good idea ... > and would like to use Emacs' threads and ‘url-http’ funcs. > I've run into a problem w/ GNU Emacs 27.1 (Debian), however: > When there is a TLS problem, i am unable to trap the process > filter error. It seems ‘condition-case’ is not the right > tool for the job. > > (defun func () > (let ((noninteractive t)) > (condition-case nil > (if (url-http-file-exists-p url) > "ok" > "dead") > (t "error")))) Isn't the syntax/usage rather as in e.g. (defun erc-element-next (&optional prev) (interactive "P") (when (erc-at-prompt-p) (goto-char (point-min)) ) (condition-case nil (if prev (erc-button-previous) (erc-button-next) ) (error (progn (goto-char (point-max)) (when prev (erc-bol) ))))) > (a) Can anyone else reproduce this on their Emacs? > (Obviously your Emacs has to be built w/ > thread support.) What are threads in this context and how do you build Emacs for that > (c) Is there a recommended way to trap process filter errors > for a noninteractive (perhaps batch) session? What's a process filter? > Thank-you for any insight into this corner of Emacs Lisp! You don't say ;) -- underground experts united https://dataswamp.org/~incal