From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Juan =?utf-8?Q?Jos=C3=A9_Garc=C3=ADa-Ripoll?= Newsgroups: gmane.emacs.devel Subject: Re: Problems with call-process (= identifying run-python issues) Date: Wed, 19 Aug 2020 10:59:39 +0200 Message-ID: <865z9fggec.fsf@csic.es> References: <86h7t0nkiw.fsf@csic.es> <831rk4ezbu.fsf@gnu.org> <83wo1vexck.fsf@gnu.org> 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="38533"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (windows-nt) To: emacs-devel@gnu.org Cancel-Lock: sha1:3R+MGoILY5LVBG5tlitANY8j19M= Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed Aug 19 11:00:55 2020 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 1k8Jxl-0009pd-4F for ged-emacs-devel@m.gmane-mx.org; Wed, 19 Aug 2020 11:00:53 +0200 Original-Received: from localhost ([::1]:56114 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1k8Jxk-0001mw-5x for ged-emacs-devel@m.gmane-mx.org; Wed, 19 Aug 2020 05:00:52 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:37588) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k8Jwk-00015h-8o for emacs-devel@gnu.org; Wed, 19 Aug 2020 04:59:50 -0400 Original-Received: from static.214.254.202.116.clients.your-server.de ([116.202.254.214]:48334 helo=ciao.gmane.io) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k8Jwh-0005jC-LV for emacs-devel@gnu.org; Wed, 19 Aug 2020 04:59:49 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1k8Jwe-0008ZE-6J for emacs-devel@gnu.org; Wed, 19 Aug 2020 10:59:44 +0200 X-Injected-Via-Gmane: http://gmane.org/ Received-SPF: pass client-ip=116.202.254.214; envelope-from=ged-emacs-devel@m.gmane-mx.org; helo=ciao.gmane.io X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/19 04:59:44 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: 20 X-Spam_score: 2.0 X-Spam_bar: ++ X-Spam_report: (2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_ADSP_CUSTOM_MED=0.001, FORGED_GMAIL_RCVD=1, FREEMAIL_FORGED_FROMDOMAIN=1, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=1, NML_ADSP_CUSTOM_MED=0.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 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" Xref: news.gmane.io gmane.emacs.devel:253991 Archived-At: Eli Zaretskii writes: > Is it all needed? If so, can you explain its role here? >> Option A: >> 1. Save files with the specified names and locations >> 2. Open a command line processor (cmd.exe or PowerShell) >> 3. Invoke "runemacs -Q --load c:\Users\juanj\Downloads\test.el" >> >> Option B: >> 1. Save files with the specified names >> 2. Press Windows Key + R (to enter commands) >> 2. Enter "runemacs -Q --load c:\Users\juanj\Downloads\test.el" > > Then I'm afraid I don't understand what the script chain.cmd does and > what it expects from Emacs or the user. Can you please take me though > this recipe one step at a time? Ok, let me please explain the problem: I want to run a process that gets its input from a file, while Emacs collects its output. This is standard working in many programming modes. For instance, it is the way run-python calls python to find out the prompt. I am finding that when I launch Emacs from the windowing environment (e.g. shortcuts, Start menu, Windows key + R, explorer), Emacs does not redirect the input of the subprocess properly. If I launch the Emacs from the command line, the subprocess works as expected. To reproduce this I have created a minimal example: - A bogus input file (foo), that is going to be the redirected input of our program - A script, chain.cmd that copies all input to its output, line by line. This is going to be the subprocess. Unfortunately, Windows does not have a 'cat' command, which is why I did it this way. - An elisp file (test.el) that launches the process with the redirected input and collects the output This example can be ran in three different ways: - Invoking runemacs.exe -Q --load test.el from the command line - Running the same command with Windows key + R - Creating a shortcut that does the same. All ingredients are needed, because we need a reproducible program, an input file and some sophisticated commands that use Emacs' call-process. However, it is *not* complicated at all and everything is pretty standard. One consequence of this problem is that run-python does not work as expected (Emacs fails to find the prompt), but as I try to show, this is not due to Python. Note that this problem is related to the ispell problems I mentioned before, but it is not the same. I already knew about the issues I was experiencing with call-process when using python or other programs, and those problems made me assume the aspell.exe was experiencing them as well. *That* analysis was incorrect, but this case is way simpler and it is reproducible using only Windows tools. Cheers, Juanjo -- Juan José García Ripoll http://juanjose.garciaripoll.com http://quinfog.hbar.es