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1 ;;; kermit.el --- additions to shell mode for use with kermit, etc.
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2
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3 ;; Copyright (C) 1988 Free Software Foundation, Inc.
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4
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5 ;; Author: Jeff Norden <jeff@colgate.csnet>
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6 ;; Created: 15 Feb 1988
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7 ;; Keywords: comm
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8
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9 ;; This file is part of XEmacs.
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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23 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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24
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25 ;;; Synched up with: FSF 19.30.
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26
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27 ;;; Commentary:
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28
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29 ;; I'm not sure, but I think somebody asked about running kermit under shell
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30 ;; mode a while ago. Anyway, here is some code that I find useful. The result
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31 ;; is that I can log onto machines with primitive operating systems (VMS and
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32 ;; ATT system V :-), and still have the features of shell-mode available for
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33 ;; command history, etc. It's also handy to be able to run a file transfer in
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34 ;; an emacs window. The transfer is in the "background", but you can also
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35 ;; monitor or stop it easily.
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36
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37 ;; The ^\ key is bound to a function for sending escape sequences to kermit,
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38 ;; and ^C^Q can be used to send any control characters needed thru to the
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39 ;; system you connect to. A more serious problem is that some brain-dead
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40 ;; systems will not recognize a ^J as an end-of-line character. So LFD is
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41 ;; bound to a new function which acts just like CR usually does in shell-mode,
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42 ;; but a ^M is sent as an end-of-line. Functions are also provided to swap the
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43 ;; bindings of CR and LFD. I've also included a filter which will clean out
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44 ;; any ^M's or ^@'s that get typed at you, but I don't really recommend it.
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45 ;; There doesn't seem to be an acceptably fast way to do this via emacs-lisp.
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46 ;; Invoking kermit by the command " kermit | tr -d '\015' " seems to work
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47 ;; better (on my system anyway).
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48
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49 ;; Here's how I've been using this setup. We have several machines connected
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50 ;; thru a fairly stupid terminal switch. If I want to connect to unix system,
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51 ;; then I use the LFD key to talk to the switch, and ignore any ^M's in the
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52 ;; buffer, and do a " stty -echo nl " after I log in. Then the only real
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53 ;; difference from being in local shell-mode is that you need to type
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54 ;; ^C^Q^C to send an interrupt, and ^C^Q^Z for a stop signal, etc. (since ^C^C
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55 ;; just generates a local stop signal, which kermit ignores).
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56 ;; To connect to a VMS system, I use a shell script to invoke kermit thru the
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57 ;; tr filter, do "M-X kermit-send-cr", and then tell VMS that I'm on a
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58 ;; half-duplex terminal.
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59
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60 ;; Some caveats:
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61 ;; 1) Kermit under shell mode is a real pain if you don't have pty's. I
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62 ;; recently discovered this on our 3b2/400. When kermit can't find a tty, it
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63 ;; assumes it is supposed to be in remote mode. So the simple command "kermit"
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64 ;; won't work in shell mode on such a system. You can get around this by using
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65 ;; the -c (connect) command line option, which means you also have to specify a
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66 ;; line and baud on the command line, as in "kermit -l /dev/tty53 -b 9600 -c".
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67 ;; However, this will cause kermit to exit when the connection is closed. So
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68 ;; in order to do a file transfer, you have to think ahead and and add -r
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69 ;; (receive) to the command line. This means that you can't use the server
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70 ;; feature. The only fix I can see is to muck around with the source code for
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71 ;; kermit, although this probably wouldn't be too hard. What is needed is an
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72 ;; option to force kermit to be local, to use stdin and stdout for interactive
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73 ;; speech, and to forget about cbreak mode.
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74
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75 ;; Please let me know if any bugs turn up.
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76 ;; Feb 1988, Jeff Norden - jeff@colgate.csnet
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77
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78 ;;; Code:
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79
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80 (require 'shell)
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81
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82 (defvar kermit-esc-char "\C-\\" "*Kermit's escape char")
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83
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84 (defun kermit-esc ()
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85 "For sending escape sequences to a kermit running in shell mode."
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86 (interactive)
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87 (process-send-string
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88 (get-buffer-process (current-buffer))
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89 (concat kermit-esc-char (char-to-string (read-char)))))
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90
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91 (defun kermit-send-char ()
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92 "Send an arbitrary character to a program in shell mode."
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93 (interactive)
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94 (process-send-string
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95 (get-buffer-process (current-buffer))
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96 (char-to-string (read-char))))
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97
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98 (define-key shell-mode-map "\C-\\" 'kermit-esc)
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99 (define-key shell-mode-map "\C-c\C-q" 'kermit-send-char)
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100 ;; extra bindings for folks suffering form ^S/^Q braindamage:
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101 (define-key shell-mode-map "\C-c\\" 'kermit-esc)
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102
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103 (defun kermit-send-input-cr ()
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104 "Like \\[comint-send-input] but end the line with carriage-return."
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105 (interactive)
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106 (comint-send-input)
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107 (comint-send-string (get-buffer-process (current-buffer)) "\r"))
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108
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109 ;; This is backwards of what makes sense, but ...
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110 (define-key shell-mode-map "\n" 'kermit-send-input-cr)
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111
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112 (defun kermit-default-cr ()
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113 "Make RETURN end the line with carriage-return and LFD end it with a newline.
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114 This is useful for talking to other systems on which carriage-return
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115 is the normal way to end a line."
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116 (interactive)
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117 (define-key shell-mode-map "\r" 'kermit-send-input-cr)
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118 (define-key shell-mode-map "\n" 'comint-send-input))
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119
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120 (defun kermit-default-nl ()
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121 "Make RETURN end the line with a newline char. This is the default state.
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122 In this state, use LFD to send a line and end it with a carriage-return."
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123 (interactive)
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124 (define-key shell-mode-map "\n" 'kermit-send-input-cr)
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125 (define-key shell-mode-map "\r" 'comint-send-input))
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126
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127 (defun kermit-clean-filter (proc str)
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128 "Strip ^M and ^@ characters from process output."
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129 (save-excursion
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130 (let ((beg (process-mark proc)))
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131 (set-buffer (process-buffer proc))
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132 (goto-char beg)
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133 (insert-before-markers str)
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134 (while (re-search-backward "[\r\C-a]+" beg t)
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135 (replace-match "")))))
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136
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137 (defun kermit-clean-on ()
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138 "Delete all null characters and ^M's from the kermit output.
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139 Note that another (perhaps better) way to do this is to use the
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140 command `kermit | tr -d '\\015''."
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141 (interactive)
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142 (set-process-filter (get-buffer-process (current-buffer))
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143 'kermit-clean-filter))
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144
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145 (defun kermit-clean-off ()
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146 "Cancel a previous kermit-clean-shell-on command."
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147 (interactive)
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148 (set-process-filter (get-buffer-process (current-buffer)) nil))
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149
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150 ;;; kermit.el ends here
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