1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
;;; kermit.el --- additions to shell mode for use with kermit -*- lexical-binding: t -*-
;; Copyright (C) 1988, 2001-2023 Free Software Foundation, Inc.
;; Author: Jeff Norden <jeff@colgate.csnet>
;; Maintainer: emacs-devel@gnu.org
;; Created: 15 Feb 1988
;; Keywords: comm
;; 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 3 of the License, 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. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; 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. Functions are also provided 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
;; difference from being in local shell-mode is that you need 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 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 probably 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
;;; Code:
(require 'shell)
(defgroup kermit nil
"Kermit support."
:group 'comm)
(defcustom kermit-esc-char "\C-\\"
"Kermit's escape char."
:type 'string)
(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)
(comint-send-string (get-buffer-process (current-buffer)) "\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-backward "[\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-on' command."
(interactive)
(set-process-filter (get-buffer-process (current-buffer)) nil))
(provide 'kermit)
;;; kermit.el ends here
|
