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1 | ;;; vmsx.el --- run asynchronous VMS subprocesses under Emacs |
2 | ||
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3 | ;; Copyright (C) 1986 Free Software Foundation, Inc. |
4 | ||
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5 | ;; Author: Mukesh Prasad |
6 | ;; Maintainer: FSF | |
6251ee24 | 7 | ;; Keywords: vms |
e5167999 | 8 | |
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9 | ;; This file is part of GNU Emacs. |
10 | ||
11 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
12 | ;; it under the terms of the GNU General Public License as published by | |
e5167999 | 13 | ;; the Free Software Foundation; either version 2, or (at your option) |
0d20f9a0 JB |
14 | ;; any later version. |
15 | ||
16 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
22 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
23 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
24 | ||
e5167999 | 25 | ;;; Code: |
0d20f9a0 JB |
26 | |
27 | (defvar display-subprocess-window nil | |
28 | "If non-nil, the suprocess window is displayed whenever input is received.") | |
29 | ||
30 | (defvar command-prefix-string "$ " | |
31 | "String to insert to distinguish commands entered by user.") | |
32 | ||
33 | (defvar subprocess-running nil) | |
34 | (defvar command-mode-map nil) | |
35 | ||
36 | (if command-mode-map | |
37 | nil | |
38 | (setq command-mode-map (make-sparse-keymap)) | |
39 | (define-key command-mode-map "\C-m" 'command-send-input) | |
40 | (define-key command-mode-map "\C-u" 'command-kill-line)) | |
41 | ||
42 | (defun subprocess-input (name str) | |
43 | "Handles input from a subprocess. Called by Emacs." | |
44 | (if display-subprocess-window | |
45 | (display-buffer subprocess-buf)) | |
46 | (let ((old-buffer (current-buffer))) | |
47 | (set-buffer subprocess-buf) | |
48 | (goto-char (point-max)) | |
49 | (insert str) | |
50 | (insert ?\n) | |
51 | (set-buffer old-buffer))) | |
52 | ||
53 | (defun subprocess-exit (name) | |
54 | "Called by Emacs upon subprocess exit." | |
55 | (setq subprocess-running nil)) | |
56 | ||
57 | (defun start-subprocess () | |
58 | "Spawns an asynchronous subprocess with output redirected to | |
59 | the buffer *COMMAND*. Within this buffer, use C-m to send | |
60 | the last line to the subprocess or to bring another line to | |
61 | the end." | |
62 | (if subprocess-running | |
63 | (return t)) | |
64 | (setq subprocess-buf (get-buffer-create "*COMMAND*")) | |
65 | (save-excursion | |
66 | (set-buffer subprocess-buf) | |
67 | (use-local-map command-mode-map)) | |
68 | (setq subprocess-running (spawn-subprocess 1 'subprocess-input | |
69 | 'subprocess-exit)) | |
70 | ;; Initialize subprocess so it doesn't panic and die upon | |
71 | ;; encountering the first error. | |
72 | (and subprocess-running | |
73 | (send-command-to-subprocess 1 "ON SEVERE_ERROR THEN CONTINUE"))) | |
74 | ||
75 | (defvar subprocess-command-to-buffer-tmpdir "SYS$SCRATCH:" | |
76 | "*Put temporary files from subprocess-command-to-buffer here.") | |
77 | ||
78 | (defun subprocess-command-to-buffer (command buffer) | |
79 | "Execute command and redirect output into buffer. | |
80 | ||
81 | BUGS: only the output up to the end of the first image activation is trapped." | |
82 | (if (not subprocess-running) | |
83 | (start-subprocess)) | |
84 | (save-excursion | |
85 | (set-buffer buffer) | |
86 | (let ((output-filename | |
87 | (concat subprocess-command-to-buffer-tmpdir | |
88 | "OUTPUT-FOR-" (getenv "USER") ".LISTING"))) | |
89 | (while (file-attributes output-filename) | |
90 | (delete-file output-filename)) | |
91 | (send-command-to-subprocess 1 (concat "DEFINE/USER SYS$OUTPUT " | |
92 | output-filename "-NEW")) | |
93 | (send-command-to-subprocess 1 command) | |
94 | (send-command-to-subprocess 1 (concat "RENAME " output-filename | |
95 | "-NEW " output-filename)) | |
96 | (while (not (file-attributes output-filename)) | |
97 | (sleep-for 2)) | |
98 | (insert-file output-filename)))) | |
99 | ||
100 | (defun subprocess-command () | |
101 | "Starts asynchronous subprocess if not running and switches to its window." | |
102 | (interactive) | |
103 | (if (not subprocess-running) | |
104 | (start-subprocess)) | |
105 | (and subprocess-running | |
106 | (progn (pop-to-buffer subprocess-buf) (goto-char (point-max))))) | |
107 | ||
108 | (defun command-send-input () | |
109 | "If at last line of buffer, sends the current line to | |
110 | the spawned subprocess. Otherwise brings back current | |
111 | line to the last line for resubmission." | |
112 | (interactive) | |
113 | (beginning-of-line) | |
114 | (let ((current-line (buffer-substring (point) | |
115 | (progn (end-of-line) (point))))) | |
116 | (if (eobp) | |
117 | (progn | |
118 | (if (not subprocess-running) | |
119 | (start-subprocess)) | |
120 | (if subprocess-running | |
121 | (progn | |
122 | (beginning-of-line) | |
123 | (send-command-to-subprocess 1 current-line) | |
124 | (if command-prefix-string | |
125 | (progn (beginning-of-line) (insert command-prefix-string))) | |
126 | (next-line 1)))) | |
127 | ;; else -- if not at last line in buffer | |
128 | (end-of-buffer) | |
129 | (backward-char) | |
130 | (next-line 1) | |
131 | (if (string-equal command-prefix-string | |
132 | (substring current-line 0 (length command-prefix-string))) | |
133 | (insert (substring current-line (length command-prefix-string))) | |
134 | (insert current-line))))) | |
135 | ||
136 | (defun command-kill-line() | |
137 | "Kills the current line. Used in command mode." | |
138 | (interactive) | |
139 | (beginning-of-line) | |
140 | (kill-line)) | |
141 | ||
142 | (define-key esc-map "$" 'subprocess-command) | |
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143 | |
144 | ;;; vmsx.el ends here |