From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: "Pascal J. Bourguignon" Newsgroups: gmane.emacs.help Subject: Re: How to make ^M in a buffer go to the beginning of line? Date: Mon, 23 Nov 2015 01:49:08 +0100 Organization: Informatimago Message-ID: <87mvu5wnej.fsf@kuiper.lan.informatimago.com> References: NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Trace: ger.gmane.org 1448239822 13511 80.91.229.3 (23 Nov 2015 00:50:22 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 23 Nov 2015 00:50:22 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Mon Nov 23 01:50:18 2015 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1a0fKi-0001A3-I4 for geh-help-gnu-emacs@m.gmane.org; Mon, 23 Nov 2015 01:50:16 +0100 Original-Received: from localhost ([::1]:58081 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a0fKi-0007P0-Fy for geh-help-gnu-emacs@m.gmane.org; Sun, 22 Nov 2015 19:50:16 -0500 Original-Path: usenet.stanford.edu!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail Original-Newsgroups: gnu.emacs.help Original-Lines: 61 Original-X-Trace: individual.net 7DQU7did6i4DaiDWWJZ4ywR+dqTfl9E5/EPPRzTw2RuvxM7vlT Cancel-Lock: sha1:Yjc0OTY5ZTE2NmU1NDZhNzNiYjRjOGY5YzczOTQ0YjI5OGRiMDM5Yw== sha1:uJvgewd0xnTvGP9CyErNf6WSYEI= Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwAQMAAABtzGvEAAAABlBMVEUAAAD///+l2Z/dAAAA oElEQVR4nK3OsRHCMAwF0O8YQufUNIQRGIAja9CxSA55AxZgFO4coMgYrEDDQZWPIlNAjwq9 033pbOBPtbXuB6PKNBn5gZkhGa86Z4x2wE67O+06WxGD/HCOGR0deY3f9Ijwwt7rNGNf6Oac l/GuZTF1wFGKiYYHKSFAkjIo1b6sCYS1sVmFhhhahKQssRjRT90ITWUk6vvK3RsPGs+M1RuR mV+hO/VvFAAAAABJRU5ErkJggg== X-Accept-Language: fr, es, en User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) Original-Xref: usenet.stanford.edu gnu.emacs.help:215904 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 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-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:108192 Archived-At: Marcin Borkowski writes: > so I have this buffer, which displays the output of a process. This > output contains loads of ^M characters, since - when run from a terminal > - the process displays a one-line, real-time-updated progress > information (like "n/m processed"). I'd like to mimic this behavior > when calling it from Emacs (programmatically, not from M-x term or > anything like that). Assuming you are using comint, you need to add a function to perform this processing in: comint-preoutput-filter-functions or perhaps: comint-output-filter-functions otherwise you will have to modify the process-filter. Notice that the processing you will have to do is not trivial: the text you receive in the preoutput-filter may contain several lines. Each line may contain several CR. You must take into account the existing text in the current line: if it's longer than the new text, the tail will have to show after the new text; and the same must happen with all the CR sequences. You must also deal with the trailing CR. Assume the end of buffer is a line: fuck! world! without trailing newline (cr-preoutput-filter "----o\r---l\r--l\r-e\rh\r") will have to replace this last line with: hello world! ^ with the current position at column 0, so that a following (cr-preoutput-filter "good bye,\nold world!\n") diplays: good bye,ld! old world! ^ (Remember that newline is equivalent to CR LF, therefore there's no reason to erase what's beyond the current possition when processing the \n). -- __Pascal Bourguignon__ http://www.informatimago.com/ “The factory of the future will have only two employees, a man and a dog. The man will be there to feed the dog. The dog will be there to keep the man from touching the equipment.” -- Carl Bass CEO Autodesk