From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Eric Abrahamsen Newsgroups: gmane.emacs.help Subject: Re: reading from standard input in batch mode Date: Tue, 22 May 2018 13:49:15 -0700 Message-ID: <87zi0rxvp0.fsf@ericabrahamsen.net> References: <87efi3zbrb.fsf@ericabrahamsen.net> <874lizzah6.fsf@ericabrahamsen.net> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1527022261 21315 195.159.176.226 (22 May 2018 20:51:01 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 22 May 2018 20:51:01 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Tue May 22 22:50:57 2018 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fLEFC-0005Lr-3i for geh-help-gnu-emacs@m.gmane.org; Tue, 22 May 2018 22:50:54 +0200 Original-Received: from localhost ([::1]:57868 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fLEHJ-0000Ti-88 for geh-help-gnu-emacs@m.gmane.org; Tue, 22 May 2018 16:53:05 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:55050) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fLEGa-0000Sr-3W for help-gnu-emacs@gnu.org; Tue, 22 May 2018 16:52:21 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fLEGX-0000xS-0Q for help-gnu-emacs@gnu.org; Tue, 22 May 2018 16:52:20 -0400 Original-Received: from [195.159.176.226] (port=53673 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1fLEGW-0000wt-PG for help-gnu-emacs@gnu.org; Tue, 22 May 2018 16:52:16 -0400 Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1fLEEN-0004PW-Iq for help-gnu-emacs@gnu.org; Tue, 22 May 2018 22:50:03 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 41 Original-X-Complaints-To: usenet@blaine.gmane.org Cancel-Lock: sha1:qzhBfyTgACiK4VH7UYP/VeBvHLo= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 195.159.176.226 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.21 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" Xref: news.gmane.org gmane.emacs.help:116816 Archived-At: Eric Abrahamsen writes: > Eric Abrahamsen writes: > >> I'm trying to figure out how batch mode works, and I want to do >> something very simple: call a subordinate emacs process, passing it a >> string, and have it write the string to a file. It's not working but I >> don't know how to debug this. >> >> In boomerang.el: >> >> (defun boomerang () >> (let ((msg (read))) >> (append-to-file msg >> nil >> "/home/eric/tmp/results.txt"))) >> >> In my main emacs: >> >> (shell-command >> "emacs -Q --batch -l boomerang.el -f boomerang \"hi there\"") >> >> The subordinate emacs starts and finishes (returning 255, which just >> came up on a thread in emacs.devel, I think), but no file is written. As >> far as I know, `read' should be reading from standard-input in this >> case. What am I doing wrong? > > I figured it out, it should have been (read t). Ignore me! No, dangit, it still doesn't work. I changed the (read) to (read t), and changed the invocation to: (shell-command "emacs -Q --batch -l boomerang.el -f boomerang \"hi there\"" "*output*" "*error*") And *output* contains "Lisp expression:" (ie, it's still trying to read from the minibuffer), and *error* contains "Error reading from stdin", (ie, it couldn't read from the minibuffer). Am I passing the string in incorrectly?