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comparison lisp/vms/vmsproc.el @ 0:376386a54a3c r19-14

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Import from CVS: tag r19-14
author cvs
date Mon, 13 Aug 2007 08:45:50 +0200
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1 ;;; vmsproc.el --- run asynchronous VMS subprocesses under Emacs
2
3 ;; Copyright (C) 1986 Free Software Foundation, Inc.
4
5 ;; Author: Mukesh Prasad
6 ;; Maintainer: FSF
7 ;; Keywords: vms
8
9 ;; This file is part of XEmacs.
10
11 ;; XEmacs is free software; you can redistribute it and/or modify it
12 ;; 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.
15
16 ;; XEmacs is distributed in the hope that it will be useful, but
17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 ;; General Public License for more details.
20
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with XEmacs; see the file COPYING. If not, write to the Free
23 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
24
25 ;;; Code:
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)
144
145 ;;; vmsproc.el ends here