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1 ;;; vmsproc.el --- run asynchronous VMS subprocesses under Emacs
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2
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3 ;; Copyright (C) 1986 Free Software Foundation, Inc.
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4
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5 ;; Author: Mukesh Prasad
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6 ;; Maintainer: FSF
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7 ;; Keywords: vms
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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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70
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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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0
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24
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25 ;;; Code:
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26
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27 (defvar display-subprocess-window nil
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28 "If non-nil, the suprocess window is displayed whenever input is received.")
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29
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30 (defvar command-prefix-string "$ "
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31 "String to insert to distinguish commands entered by user.")
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32
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33 (defvar subprocess-running nil)
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34 (defvar command-mode-map nil)
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35
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36 (if command-mode-map
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37 nil
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38 (setq command-mode-map (make-sparse-keymap))
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39 (define-key command-mode-map "\C-m" 'command-send-input)
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40 (define-key command-mode-map "\C-u" 'command-kill-line))
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41
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42 (defun subprocess-input (name str)
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43 "Handles input from a subprocess. Called by Emacs."
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44 (if display-subprocess-window
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45 (display-buffer subprocess-buf))
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46 (let ((old-buffer (current-buffer)))
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47 (set-buffer subprocess-buf)
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48 (goto-char (point-max))
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49 (insert str)
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50 (insert ?\n)
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51 (set-buffer old-buffer)))
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52
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53 (defun subprocess-exit (name)
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54 "Called by Emacs upon subprocess exit."
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55 (setq subprocess-running nil))
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56
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57 (defun start-subprocess ()
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58 "Spawns an asynchronous subprocess with output redirected to
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59 the buffer *COMMAND*. Within this buffer, use C-m to send
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60 the last line to the subprocess or to bring another line to
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61 the end."
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62 (if subprocess-running
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63 (return t))
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64 (setq subprocess-buf (get-buffer-create "*COMMAND*"))
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65 (save-excursion
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66 (set-buffer subprocess-buf)
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67 (use-local-map command-mode-map))
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68 (setq subprocess-running (spawn-subprocess 1 'subprocess-input
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69 'subprocess-exit))
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70 ;; Initialize subprocess so it doesn't panic and die upon
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71 ;; encountering the first error.
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72 (and subprocess-running
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73 (send-command-to-subprocess 1 "ON SEVERE_ERROR THEN CONTINUE")))
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74
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75 (defun subprocess-command-to-buffer (command buffer)
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76 "Execute COMMAND and redirect output into BUFFER."
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77 (let (cmd args)
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78 (setq cmd (substring command 0 (string-match " " command)))
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79 (setq args (substring command (string-match " " command)))
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80 (call-process cmd nil buffer nil "*dcl*" args)))
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81 ;BUGS: only the output up to the end of the first image activation is trapped.
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82 ; (if (not subprocess-running)
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83 ; (start-subprocess))
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84 ; (save-excursion
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85 ; (set-buffer buffer)
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86 ; (let ((output-filename (concat "SYS$SCRATCH:OUTPUT-FOR-"
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87 ; (getenv "USER") ".LISTING")))
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88 ; (while (file-exists-p output-filename)
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89 ; (delete-file output-filename))
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90 ; (define-logical-name "SYS$OUTPUT" (concat output-filename "-NEW"))
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91 ; (send-command-to-subprocess 1 command)
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92 ; (send-command-to-subprocess 1 (concat
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93 ; "RENAME " output-filename
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94 ; "-NEW " output-filename))
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95 ; (while (not (file-exists-p output-filename))
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96 ; (sleep-for 1))
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97 ; (define-logical-name "SYS$OUTPUT" nil)
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98 ; (insert-file output-filename)
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99 ; (delete-file output-filename))))
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100
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101 (defun subprocess-command ()
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102 "Starts asynchronous subprocess if not running and switches to its window."
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103 (interactive)
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104 (if (not subprocess-running)
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105 (start-subprocess))
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106 (and subprocess-running
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107 (progn (pop-to-buffer subprocess-buf) (goto-char (point-max)))))
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108
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109 (defun command-send-input ()
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110 "If at last line of buffer, sends the current line to
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111 the spawned subprocess. Otherwise brings back current
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112 line to the last line for resubmission."
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113 (interactive)
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114 (beginning-of-line)
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115 (let ((current-line (buffer-substring (point)
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116 (progn (end-of-line) (point)))))
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117 (if (eobp)
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118 (progn
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119 (if (not subprocess-running)
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120 (start-subprocess))
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121 (if subprocess-running
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122 (progn
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123 (beginning-of-line)
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124 (send-command-to-subprocess 1 current-line)
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125 (if command-prefix-string
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126 (progn (beginning-of-line) (insert command-prefix-string)))
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127 (next-line 1))))
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128 ;; else -- if not at last line in buffer
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129 (end-of-buffer)
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130 (backward-char)
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131 (next-line 1)
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132 (if (string-equal command-prefix-string
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133 (substring current-line 0 (length command-prefix-string)))
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134 (insert (substring current-line (length command-prefix-string)))
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135 (insert current-line)))))
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136
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137 (defun command-kill-line()
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138 "Kills the current line. Used in command mode."
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139 (interactive)
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140 (beginning-of-line)
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141 (kill-line))
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142
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143 (define-key esc-map "$" 'subprocess-command)
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144
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145 ;;; vmsproc.el ends here
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