157 lines
6.5 KiB
EmacsLisp
157 lines
6.5 KiB
EmacsLisp
;;; kermit.el --- additions to shell mode for use with kermit -*- lexical-binding: t -*-
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;; Copyright (C) 1988, 2001-2024 Free Software Foundation, Inc.
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;; Author: Jeff Norden <jeff@colgate.csnet>
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;; Maintainer: emacs-devel@gnu.org
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;; Created: 15 Feb 1988
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;; Keywords: comm
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; I'm not sure, but I think somebody asked about running kermit under shell
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;; mode a while ago. Anyway, here is some code that I find useful. The result
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;; is that I can log onto machines with primitive operating systems (VMS and
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;; ATT system V :-), and still have the features of shell-mode available for
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;; command history, etc. It's also handy to be able to run a file transfer in
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;; an Emacs window. The transfer is in the "background", but you can also
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;; monitor or stop it easily.
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;; The ^\ key is bound to a function for sending escape sequences to kermit,
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;; and ^C^Q can be used to send any control characters needed thru to the
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;; system you connect to. A more serious problem is that some brain-dead
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;; systems will not recognize a ^J as an end-of-line character. So LFD is
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;; bound to a new function which acts just like CR usually does in shell-mode,
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;; but a ^M is sent as an end-of-line. Functions are also provided to swap the
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;; bindings of CR and LFD. I've also included a filter which will clean out
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;; any ^M's or ^@'s that get typed at you, but I don't really recommend it.
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;; There doesn't seem to be an acceptably fast way to do this via emacs-lisp.
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;; Invoking kermit by the command " kermit | tr -d '\015' " seems to work
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;; better (on my system anyway).
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;; Here's how I've been using this setup. We have several machines connected
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;; thru a fairly stupid terminal switch. If I want to connect to unix system,
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;; then I use the LFD key to talk to the switch, and ignore any ^M's in the
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;; buffer, and do a " stty -echo nl " after I log in. Then the only real
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;; difference from being in local shell-mode is that you need to type
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;; ^C^Q^C to send an interrupt, and ^C^Q^Z for a stop signal, etc. (since ^C^C
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;; just generates a local stop signal, which kermit ignores).
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;; To connect to a VMS system, I use a shell script to invoke kermit thru the
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;; tr filter, do "M-X kermit-send-cr", and then tell VMS that I'm on a
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;; half-duplex terminal.
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;; Some caveats:
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;; 1) Kermit under shell mode is a real pain if you don't have pty's. I
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;; recently discovered this on our 3b2/400. When kermit can't find a tty, it
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;; assumes it is supposed to be in remote mode. So the simple command "kermit"
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;; won't work in shell mode on such a system. You can get around this by using
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;; the -c (connect) command line option, which means you also have to specify a
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;; line and baud on the command line, as in "kermit -l /dev/tty53 -b 9600 -c".
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;; However, this will cause kermit to exit when the connection is closed. So
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;; in order to do a file transfer, you have to think ahead and add -r
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;; (receive) to the command line. This means that you can't use the server
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;; feature. The only fix I can see is to muck around with the source code for
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;; kermit, although this probably wouldn't be too hard. What is needed is an
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;; option to force kermit to be local, to use stdin and stdout for interactive
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;; speech, and to forget about cbreak mode.
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;; Please let me know if any bugs turn up.
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;; Feb 1988, Jeff Norden - jeff@colgate.csnet
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;;; Code:
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(require 'shell)
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(defgroup kermit nil
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"Kermit support."
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:group 'comm)
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(defcustom kermit-esc-char "\C-\\"
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"Kermit's escape char."
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:type 'string)
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(defun kermit-esc ()
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"For sending escape sequences to a kermit running in shell mode."
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(interactive)
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(process-send-string
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(get-buffer-process (current-buffer))
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(concat kermit-esc-char (char-to-string (read-char)))))
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(defun kermit-send-char ()
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"Send an arbitrary character to a program in shell mode."
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(interactive)
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(process-send-string
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(get-buffer-process (current-buffer))
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(char-to-string (read-char))))
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(define-key shell-mode-map "\C-\\" 'kermit-esc)
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(define-key shell-mode-map "\C-c\C-q" 'kermit-send-char)
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;; extra bindings for folks suffering form ^S/^Q braindamage:
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(define-key shell-mode-map "\C-c\\" 'kermit-esc)
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(defun kermit-send-input-cr ()
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"Like \\[comint-send-input] but end the line with carriage-return."
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(interactive)
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(comint-send-input)
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(comint-send-string (get-buffer-process (current-buffer)) "\r"))
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;; This is backwards of what makes sense, but ...
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(define-key shell-mode-map "\n" 'kermit-send-input-cr)
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(defun kermit-default-cr ()
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"Make RETURN end the line with carriage-return and LFD end it with a newline.
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This is useful for talking to other systems on which carriage-return
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is the normal way to end a line."
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(interactive)
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(define-key shell-mode-map "\r" 'kermit-send-input-cr)
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(define-key shell-mode-map "\n" 'comint-send-input))
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(defun kermit-default-nl ()
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"Make RETURN end the line with a newline char. This is the default state.
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In this state, use LFD to send a line and end it with a carriage-return."
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(interactive)
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(define-key shell-mode-map "\n" 'kermit-send-input-cr)
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(define-key shell-mode-map "\r" 'comint-send-input))
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(defun kermit-clean-filter (proc str)
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"Strip ^M and ^@ characters from process output."
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(save-excursion
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(let ((beg (process-mark proc)))
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(set-buffer (process-buffer proc))
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(goto-char beg)
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(insert-before-markers str)
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(while (re-search-backward "[\r\C-a]+" beg t)
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(replace-match "")))))
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(defun kermit-clean-on ()
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"Delete all null characters and ^M's from the kermit output.
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Note that another (perhaps better) way to do this is to use the
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command `kermit | tr -d \\='\\015\\=''."
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(interactive)
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(set-process-filter (get-buffer-process (current-buffer))
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'kermit-clean-filter))
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(defun kermit-clean-off ()
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"Cancel a previous `kermit-clean-on' command."
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(interactive)
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(set-process-filter (get-buffer-process (current-buffer)) nil))
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(provide 'kermit)
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;;; kermit.el ends here
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