From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.help Subject: Re: call-process and incremental display of output Date: Tue, 16 Oct 2018 10:36:48 -0400 Message-ID: References: <87y3ay2fcy.fsf@oldenburg.str.redhat.com> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Trace: blaine.gmane.org 1539700526 29721 195.159.176.226 (16 Oct 2018 14:35:26 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 16 Oct 2018 14:35:26 +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 Oct 16 16:35:22 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 1gCQRO-0007bO-B4 for geh-help-gnu-emacs@m.gmane.org; Tue, 16 Oct 2018 16:35:22 +0200 Original-Received: from localhost ([::1]:58424 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gCQTU-0004s3-Nu for geh-help-gnu-emacs@m.gmane.org; Tue, 16 Oct 2018 10:37:32 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:55447) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gCQSz-0004rq-Vc for help-gnu-emacs@gnu.org; Tue, 16 Oct 2018 10:37:06 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gCQSu-0002Ab-TK for help-gnu-emacs@gnu.org; Tue, 16 Oct 2018 10:37:01 -0400 Original-Received: from [195.159.176.226] (port=44179 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1gCQSu-00029e-LQ for help-gnu-emacs@gnu.org; Tue, 16 Oct 2018 10:36:56 -0400 Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1gCQQl-0006oC-Om for help-gnu-emacs@gnu.org; Tue, 16 Oct 2018 16:34:43 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 31 Original-X-Complaints-To: usenet@blaine.gmane.org Cancel-Lock: sha1:Y0snp9fYxgSSY5w4IjbswOi3BnM= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] 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:118282 Archived-At: > (defun fw/get-new-mail () > (interactive) > (let* ((buffer (get-buffer-create "*mbsync*")) > (status (with-current-buffer buffer > (delete-region (point-min) (point-max)) > (call-process "bash" nil (list buffer t) t > "-c" " > for x in {1..5} ; do > date > sleep 1 > done > ")))) > (unless (= 0 status) > (switch-to-buffer buffer) > (error "mbsync exit with status %d" status)))) > > When I run this using ‘M-x fw/get-new-mail RET’, the buffer is not > displayed, even though I passed t for the display argument. The argument to call-process controls whether redisplay will take place while the process is running, so you indeed need to set it to t in your case, but it doesn't affect which buffer is shown in which window, and you only display the buffer in the switch-to-buffer which is performed after call-process is over. IOW, just move your switch-to-buffer (which you should also change to pop-to-buffer or something like that if you want your code to be robust) to before the call to call-process. Stefan