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1 | ;;; vmsproc.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 |
76d7458e | 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) |
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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 | |
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22 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
23 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
24 | ;; Boston, MA 02111-1307, USA. | |
0d20f9a0 | 25 | |
e5167999 | 26 | ;;; Code: |
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27 | |
28 | (defvar display-subprocess-window nil | |
40198478 | 29 | "If non-nil, the subprocess window is displayed whenever input is received.") |
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30 | |
31 | (defvar command-prefix-string "$ " | |
32 | "String to insert to distinguish commands entered by user.") | |
33 | ||
34 | (defvar subprocess-running nil) | |
35 | (defvar command-mode-map nil) | |
36 | ||
37 | (if command-mode-map | |
38 | nil | |
39 | (setq command-mode-map (make-sparse-keymap)) | |
40 | (define-key command-mode-map "\C-m" 'command-send-input) | |
41 | (define-key command-mode-map "\C-u" 'command-kill-line)) | |
42 | ||
43 | (defun subprocess-input (name str) | |
44 | "Handles input from a subprocess. Called by Emacs." | |
45 | (if display-subprocess-window | |
46 | (display-buffer subprocess-buf)) | |
47 | (let ((old-buffer (current-buffer))) | |
48 | (set-buffer subprocess-buf) | |
49 | (goto-char (point-max)) | |
50 | (insert str) | |
51 | (insert ?\n) | |
52 | (set-buffer old-buffer))) | |
53 | ||
54 | (defun subprocess-exit (name) | |
55 | "Called by Emacs upon subprocess exit." | |
56 | (setq subprocess-running nil)) | |
57 | ||
58 | (defun start-subprocess () | |
59 | "Spawns an asynchronous subprocess with output redirected to | |
60 | the buffer *COMMAND*. Within this buffer, use C-m to send | |
61 | the last line to the subprocess or to bring another line to | |
62 | the end." | |
63 | (if subprocess-running | |
64 | (return t)) | |
65 | (setq subprocess-buf (get-buffer-create "*COMMAND*")) | |
66 | (save-excursion | |
67 | (set-buffer subprocess-buf) | |
68 | (use-local-map command-mode-map)) | |
69 | (setq subprocess-running (spawn-subprocess 1 'subprocess-input | |
70 | 'subprocess-exit)) | |
71 | ;; Initialize subprocess so it doesn't panic and die upon | |
72 | ;; encountering the first error. | |
73 | (and subprocess-running | |
74 | (send-command-to-subprocess 1 "ON SEVERE_ERROR THEN CONTINUE"))) | |
75 | ||
76 | (defun subprocess-command-to-buffer (command buffer) | |
77 | "Execute COMMAND and redirect output into BUFFER." | |
78 | (let (cmd args) | |
79 | (setq cmd (substring command 0 (string-match " " command))) | |
80 | (setq args (substring command (string-match " " command))) | |
81 | (call-process cmd nil buffer nil "*dcl*" args))) | |
82 | ;BUGS: only the output up to the end of the first image activation is trapped. | |
83 | ; (if (not subprocess-running) | |
84 | ; (start-subprocess)) | |
85 | ; (save-excursion | |
86 | ; (set-buffer buffer) | |
87 | ; (let ((output-filename (concat "SYS$SCRATCH:OUTPUT-FOR-" | |
88 | ; (getenv "USER") ".LISTING"))) | |
89 | ; (while (file-exists-p output-filename) | |
90 | ; (delete-file output-filename)) | |
91 | ; (define-logical-name "SYS$OUTPUT" (concat output-filename "-NEW")) | |
92 | ; (send-command-to-subprocess 1 command) | |
93 | ; (send-command-to-subprocess 1 (concat | |
94 | ; "RENAME " output-filename | |
95 | ; "-NEW " output-filename)) | |
96 | ; (while (not (file-exists-p output-filename)) | |
97 | ; (sleep-for 1)) | |
98 | ; (define-logical-name "SYS$OUTPUT" nil) | |
99 | ; (insert-file output-filename) | |
100 | ; (delete-file output-filename)))) | |
101 | ||
102 | (defun subprocess-command () | |
103 | "Starts asynchronous subprocess if not running and switches to its window." | |
104 | (interactive) | |
105 | (if (not subprocess-running) | |
106 | (start-subprocess)) | |
107 | (and subprocess-running | |
108 | (progn (pop-to-buffer subprocess-buf) (goto-char (point-max))))) | |
109 | ||
110 | (defun command-send-input () | |
111 | "If at last line of buffer, sends the current line to | |
112 | the spawned subprocess. Otherwise brings back current | |
113 | line to the last line for resubmission." | |
114 | (interactive) | |
115 | (beginning-of-line) | |
116 | (let ((current-line (buffer-substring (point) | |
117 | (progn (end-of-line) (point))))) | |
118 | (if (eobp) | |
119 | (progn | |
120 | (if (not subprocess-running) | |
121 | (start-subprocess)) | |
122 | (if subprocess-running | |
123 | (progn | |
124 | (beginning-of-line) | |
125 | (send-command-to-subprocess 1 current-line) | |
126 | (if command-prefix-string | |
127 | (progn (beginning-of-line) (insert command-prefix-string))) | |
128 | (next-line 1)))) | |
129 | ;; else -- if not at last line in buffer | |
130 | (end-of-buffer) | |
131 | (backward-char) | |
132 | (next-line 1) | |
133 | (if (string-equal command-prefix-string | |
134 | (substring current-line 0 (length command-prefix-string))) | |
135 | (insert (substring current-line (length command-prefix-string))) | |
136 | (insert current-line))))) | |
137 | ||
138 | (defun command-kill-line() | |
139 | "Kills the current line. Used in command mode." | |
140 | (interactive) | |
141 | (beginning-of-line) | |
142 | (kill-line)) | |
143 | ||
144 | (define-key esc-map "$" 'subprocess-command) | |
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145 | |
146 | ;;; vmsproc.el ends here |