;;Additions to shell mode for use with kermit, etc.;;Feb 1988, Jeff Norden - jeff@colgate.csnet;; Copyright (C) 1988 Free Software Foundation, Inc.;; This file is part of GNU Emacs.;; GNU Emacs is free software; you can redistribute it and/or modify;; it under the terms of the GNU General Public License as published by;; the Free Software Foundation; either version 1, or (at your option);; any later version.;; GNU Emacs is distributed in the hope that it will be useful,;; but WITHOUT ANY WARRANTY; without even the implied warranty of;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the;; GNU General Public License for more details.;; You should have received a copy of the GNU General Public License;; along with GNU Emacs; see the file COPYING.  If not, write to;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.(require 'shell);; I'm not sure, but I think somebody asked about running kermit under shell;; mode a while ago.  Anyway, here is some code that I find useful.  The result;; is that I can log onto machines with primitive operating systems (VMS and;; ATT system V :-), and still have the features of shell-mode available for;; command history, etc.  It's also handy to be able to run a file transfer in;; an emacs window.  The transfer is in the "background", but you can also;; monitor or stop it easily.;; The ^\ key is bound to a function for sending escape sequences to kermit,;; and ^C^Q can be used to send any control characters needed thru to the;; system you connect to.  A more serious problem is that some brain-dead;; systems will not recognize a ^J as an end-of-line character.  So LFD is;; bound to a new function which acts just like CR usually does in shell-mode,;; but a ^M is sent as an end-of-line.  Funcions are also provied to swap the;; bindings of CR and LFD.  I've also included a filter which will clean out;; any ^M's or ^@'s that get typed at you, but I don't really recommend it.;; There doesn't seem to be an acceptably fast way to do this via emacs-lisp.;; Invoking kermit by the command " kermit | tr -d '\015' " seems to work;; better (on my system anyway).;; Here's how I've been using this setup.  We have several machines connected;; thru a fairly stupid terminal switch.  If I want to connect to unix system,;; then I use the LFD key to talk to the switch, and ignore any ^M's in the;; buffer, and do a " stty -echo nl " after I log in.  Then the only real;; differnce from being in local shell-mode is that it is you need to to type;; ^C^Q^C to send an interrupt, and ^C^Q^Z for a stop signal, etc.  (since ^C^C;; just generates a local stop signal, which kermit ignores).;; To connect to a VMS system, I use a shell script to invoke kermit thru the;; tr filter, do "M-X kermit-send-cr", and then tell VMS that I'm on a half-duplex;; terminal.;; Some caveats:;; 1) Kermit under shell mode is a real pain if you don't have pty's.  I;; recently discovered this on our 3b2/400.  When kermit can't find a tty, it;; assumes it is supposed to be in remote mode.  So the simple command "kermit";; won't work in shell mode on such a system.  You can get around this by using;; the -c (connect) command line option, which means you also have to specify a;; line and baud on the command line, as in "kermit -l /dev/tty53 -b 9600 -c".;; However, this will cause kermit to exit when the connection is closed.  So;; in order to do a file transfer, you have to think ahead and and add -r;; (receive) to the command line.  This means that you can't use the server;; feature.  The only fix I can see is to muck around with the source code for;; kermit, although this problably wouldn't be too hard.  What is needed is an;; option to force kermit to be local, to use stdin and stdout for interactive;; speech, and to forget about cbreak mode.;; 2) The "clean-filter" can be a troublesome item.  The main problem arises if;; you are running a program under shell-mode which is doing periodic output,;; and you then try to switch to another buffer.  I came across this while;; running kermit file transfers - kermit prints a dot each time a packet is;; received. Since emacs is interrupted each time a dot is printed, it becomes;; impossible to edit the other buffer.  If you hit a key while the filter code;; is running, that character will wind up in the *shell* buffer instead of the;; current one!  So you need to be careful to turn the filter off before;; leaving the buffer if a program is still running.  In fact, you can't even;; use "M-x clean-shell-off" to do this, because you won't be able to type;; "clean-shell-off" in the minibuffer!!  So you need to have this command;; bound to a keystroke.;; Please let me know if any bugs turn up.;; Feb 1988, Jeff Norden - jeff@colgate.csnet(defvar kermit-esc-char "\C-\\" "*Kermit's escape char")(defun kermit-esc ()  "For sending escape sequences to a kermit running in shell mode."  (interactive)  (process-send-string    (get-buffer-process (current-buffer))   (concat kermit-esc-char (char-to-string (read-char)))))(defun kermit-send-char ()  "Send an arbitrary character to a program in shell mode."  (interactive)  (process-send-string    (get-buffer-process (current-buffer))   (char-to-string (read-char))))(define-key shell-mode-map "\C-\\" 'kermit-esc)(define-key shell-mode-map "\C-c\C-q" 'kermit-send-char);; extra bindings for folks suffering form ^S/^Q braindamage:(define-key shell-mode-map "\C-c\\" 'kermit-esc)(defun shell-send-input-cr ()  "Like \\[shell-send-input] but end the line with carriage-return."  (interactive)  (end-of-line)    (if (eobp)	(progn	  (move-marker last-input-start	       (process-mark (get-buffer-process (current-buffer))))	  (insert ?\n)	  (move-marker last-input-end (point)))    (beginning-of-line)    (re-search-forward shell-prompt-pattern nil t)    (let ((copy (buffer-substring (point)				  (progn (forward-line 1) (point)))))      (goto-char (point-max))      (move-marker last-input-start (point))      (insert copy)      (move-marker last-input-end (point))))    (condition-case ()	(save-excursion	  (goto-char last-input-start)	  (shell-set-directory))      (error (funcall shell-set-directory-error-hook)))  (let ((process (get-buffer-process (current-buffer))))    (process-send-region process last-input-start (- last-input-end 1))    (process-send-string process "\r")    (set-marker (process-mark process) (point))));; This is backwards of what makes sense, but ...(define-key shell-mode-map "\n" 'shell-send-input-cr)(defun kermit-default-cr ()  "Make RETURN end the line with carriage-return and LFD end it with a newline.This is useful for talking to other systems on which carriage-returnis the normal way to end a line."  (interactive)  (define-key shell-mode-map "\r" 'shell-send-input-cr)  (define-key shell-mode-map "\n" 'shell-send-input))(defun kermit-default-nl ()  "Make RETURN end the line with a newline char.  This is the default state.In this state, use LFD to send a line and end it with a carriage-return."  (interactive)  (define-key shell-mode-map "\n" 'shell-send-input-cr)  (define-key shell-mode-map "\r" 'shell-send-input));; This filter works, but I don't especially recommend it.(defun kermit-clean-filter (process string)  "A process filter which deletes all ^M's and ^@'s from the output."  (set-buffer (process-buffer process))  (let       ((firstpos (string-match "[^\C-@\r]+" string))       (buffermark (process-mark process))       (oldpt (point))       (newstring '"")       goback)    (while firstpos      (setq newstring 	    (concat newstring (substring string firstpos (match-end 0))))      (setq firstpos (string-match "[^\C-@\r]+" string (match-end 0))))    (goto-char (marker-position buffermark))    (setq goback (< oldpt (point)))    (insert newstring)    (set-marker buffermark (point))    (if goback (goto-char oldpt))))(defun kermit-clean-on ()  "Delete all null characters and ^M's from the kermit output.Note that another (perhaps better) way to do this is to use thecommand `kermit | tr -d '\\015''."  (interactive)  (set-process-filter (get-buffer-process (current-buffer))		      'kermit-clean-filter))(defun kermit-clean-off ()  "Cancel a previous kermit-clean-shell-on command"  (interactive)  (set-process-filter (get-buffer-process (current-buffer)) nil))