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+;;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.
+
+;; 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 kermit-send-input-cr ()
+  "Like \\[comint-send-input] but end the line with carriage-return."
+  (interactive)
+  (comint-send-input "\r"))
+
+;; This is backwards of what makes sense, but ...
+(define-key shell-mode-map "\n" 'kermit-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-return
+is the normal way to end a line."
+  (interactive)
+  (define-key shell-mode-map "\r" 'kermit-send-input-cr)
+  (define-key shell-mode-map "\n" 'comint-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" 'kermit-send-input-cr)
+  (define-key shell-mode-map "\r" 'comint-send-input))
+
+(defun kermit-clean-filter (proc str)
+  "Strip ^M and ^@ characters from process output."
+  (save-excursion
+    (let ((beg (process-mark proc)))
+      (set-buffer (process-buffer proc))
+      (goto-char beg)
+      (insert-before-markers str)
+      (while (re-search-backware "[\r\C-a]+" beg t)
+	(replace-match "")))))
+
+(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 the
+command `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))
+
+