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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 | ||
e5167999 ER |
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) |
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 | (defun subprocess-command-to-buffer (command buffer) | |
76 | "Execute COMMAND and redirect output into BUFFER." | |
77 | (let (cmd args) | |
78 | (setq cmd (substring command 0 (string-match " " command))) | |
79 | (setq args (substring command (string-match " " command))) | |
80 | (call-process cmd nil buffer nil "*dcl*" args))) | |
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 (concat "SYS$SCRATCH:OUTPUT-FOR-" | |
87 | ; (getenv "USER") ".LISTING"))) | |
88 | ; (while (file-exists-p output-filename) | |
89 | ; (delete-file output-filename)) | |
90 | ; (define-logical-name "SYS$OUTPUT" (concat output-filename "-NEW")) | |
91 | ; (send-command-to-subprocess 1 command) | |
92 | ; (send-command-to-subprocess 1 (concat | |
93 | ; "RENAME " output-filename | |
94 | ; "-NEW " output-filename)) | |
95 | ; (while (not (file-exists-p output-filename)) | |
96 | ; (sleep-for 1)) | |
97 | ; (define-logical-name "SYS$OUTPUT" nil) | |
98 | ; (insert-file output-filename) | |
99 | ; (delete-file output-filename)))) | |
100 | ||
101 | (defun subprocess-command () | |
102 | "Starts asynchronous subprocess if not running and switches to its window." | |
103 | (interactive) | |
104 | (if (not subprocess-running) | |
105 | (start-subprocess)) | |
106 | (and subprocess-running | |
107 | (progn (pop-to-buffer subprocess-buf) (goto-char (point-max))))) | |
108 | ||
109 | (defun command-send-input () | |
110 | "If at last line of buffer, sends the current line to | |
111 | the spawned subprocess. Otherwise brings back current | |
112 | line to the last line for resubmission." | |
113 | (interactive) | |
114 | (beginning-of-line) | |
115 | (let ((current-line (buffer-substring (point) | |
116 | (progn (end-of-line) (point))))) | |
117 | (if (eobp) | |
118 | (progn | |
119 | (if (not subprocess-running) | |
120 | (start-subprocess)) | |
121 | (if subprocess-running | |
122 | (progn | |
123 | (beginning-of-line) | |
124 | (send-command-to-subprocess 1 current-line) | |
125 | (if command-prefix-string | |
126 | (progn (beginning-of-line) (insert command-prefix-string))) | |
127 | (next-line 1)))) | |
128 | ;; else -- if not at last line in buffer | |
129 | (end-of-buffer) | |
130 | (backward-char) | |
131 | (next-line 1) | |
132 | (if (string-equal command-prefix-string | |
133 | (substring current-line 0 (length command-prefix-string))) | |
134 | (insert (substring current-line (length command-prefix-string))) | |
135 | (insert current-line))))) | |
136 | ||
137 | (defun command-kill-line() | |
138 | "Kills the current line. Used in command mode." | |
139 | (interactive) | |
140 | (beginning-of-line) | |
141 | (kill-line)) | |
142 | ||
143 | (define-key esc-map "$" 'subprocess-command) | |
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144 | |
145 | ;;; vmsproc.el ends here |