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[emacs.git] / lisp / vmsproc.el
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1 ;;; vmsproc.el --- run asynchronous VMS subprocesses under Emacs
3 ;; Copyright (C) 1986 Free Software Foundation, Inc.
5 ;; Author: Mukesh Prasad
6 ;; Maintainer: FSF
7 ;; Keywords: vms
9 ;; This file is part of GNU Emacs.
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
13 ;; the Free Software Foundation; either version 2, or (at your option)
14 ;; any later version.
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.
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 the
23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 ;; Boston, MA 02111-1307, USA.
26 ;;; Code:
28 (defvar display-subprocess-window nil
29 "If non-nil, the subprocess window is displayed whenever input is received.")
31 (defvar command-prefix-string "$ "
32 "String to insert to distinguish commands entered by user.")
34 (defvar subprocess-running nil)
35 (defvar command-mode-map nil)
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))
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)))
54 (defun subprocess-exit (name)
55 "Called by Emacs upon subprocess exit."
56 (setq subprocess-running nil))
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")))
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$OUTPUT" nil)
99 ; (insert-file output-filename)
100 ; (delete-file output-filename))))
102 (defun subprocess-command ()
103 "Starts asynchronous subprocess if not running and switches to its window."
104 (interactive)
105 (if (not subprocess-running)
106 (start-subprocess))
107 (and subprocess-running
108 (progn (pop-to-buffer subprocess-buf) (goto-char (point-max)))))
110 (defun command-send-input ()
111 "If at last line of buffer, sends the current line to
112 the spawned subprocess. Otherwise brings back current
113 line to the last line for resubmission."
114 (interactive)
115 (beginning-of-line)
116 (let ((current-line (buffer-substring (point)
117 (progn (end-of-line) (point)))))
118 (if (eobp)
119 (progn
120 (if (not subprocess-running)
121 (start-subprocess))
122 (if subprocess-running
123 (progn
124 (beginning-of-line)
125 (send-command-to-subprocess 1 current-line)
126 (if command-prefix-string
127 (progn (beginning-of-line) (insert command-prefix-string)))
128 (next-line 1))))
129 ;; else -- if not at last line in buffer
130 (end-of-buffer)
131 (backward-char)
132 (next-line 1)
133 (if (string-equal command-prefix-string
134 (substring current-line 0 (length command-prefix-string)))
135 (insert (substring current-line (length command-prefix-string)))
136 (insert current-line)))))
138 (defun command-kill-line()
139 "Kills the current line. Used in command mode."
140 (interactive)
141 (beginning-of-line)
142 (kill-line))
144 (define-key esc-map "$" 'subprocess-command)
146 ;;; vmsproc.el ends here