summaryrefslogtreecommitdiff
path: root/lisp/vmsproc.el
blob: e36400476f4be8324396ff406d4ee9c269b80165 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
;;; vmsproc.el --- run asynchronous VMS subprocesses under Emacs

;; Copyright (C) 1986, 2001, 2002, 2003, 2004, 2005,
;;   2006, 2007 Free Software Foundation, Inc.

;; Author: Mukesh Prasad
;; Maintainer: FSF
;; Keywords: vms

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3, or (at your option)
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Commentary:

;;; Code:

(defvar display-subprocess-window nil
  "If non-nil, the subprocess window is displayed whenever input is received.")

(defvar command-prefix-string "$ "
  "String to insert to distinguish commands entered by user.")

(defvar subprocess-running nil)
(defvar subprocess-buf nil)

(defvar command-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map "\C-m" 'command-send-input)
    (define-key map "\C-u" 'command-kill-line)
    map))

(defun subprocess-input (name str)
  "Handle input from a subprocess.  Called by Emacs."
  (if display-subprocess-window
      (display-buffer subprocess-buf))
  (with-current-buffer subprocess-buf
    (goto-char (point-max))
    (insert str ?\n)))

(defun subprocess-exit (name)
  "Called by Emacs upon subprocess exit."
  (setq subprocess-running nil))

(defun start-subprocess ()
  "Spawn an asynchronous subprocess with output redirected to
the buffer *COMMAND*.  Within this buffer, use C-m to send
the last line to the subprocess or to bring another line to
the end."
  (if subprocess-running
      (return t))
  (setq subprocess-buf (get-buffer-create "*COMMAND*"))
  (with-current-buffer subprocess-buf
    (use-local-map command-mode-map))
  (setq subprocess-running (spawn-subprocess 1 'subprocess-input
					     'subprocess-exit))
  ;; Initialize subprocess so it doesn't panic and die upon
  ;; encountering the first error.
  (and subprocess-running
       (send-command-to-subprocess 1 "ON SEVERE_ERROR THEN CONTINUE")))

(defun subprocess-command-to-buffer (command buffer)
  "Execute COMMAND and redirect output into BUFFER."
  (let (cmd args)
    (setq cmd (substring command 0 (string-match " " command)))
    (setq args (substring command (string-match " " command)))
    (call-process cmd nil buffer nil "*dcl*" args)))
  ;; BUGS: only the output up to the end of the first image activation is trapped.
  ;; (if (not subprocess-running)
  ;;     (start-subprocess))
  ;; (with-current-buffer buffer
  ;;   (let ((output-filename (concat "SYS$SCRATCH:OUTPUT-FOR-"
  ;;       			   (getenv "USER") ".LISTING")))
  ;;     (while (file-exists-p output-filename)
  ;;       (delete-file output-filename))
  ;;     (define-logical-name "SYS$OUTPUT" (concat output-filename "-NEW"))
  ;;     (send-command-to-subprocess 1 command)
  ;;     (send-command-to-subprocess 1 (concat
  ;;       			     "RENAME " output-filename
  ;;       			     "-NEW " output-filename))
  ;;     (while (not (file-exists-p output-filename))
  ;;       (sleep-for 1))
  ;;     (define-logical-name "SYS$OUTPUT" nil)
  ;;     (insert-file output-filename)
  ;;     (delete-file output-filename))))

(defun subprocess-command ()
  "Start asynchronous subprocess if not running and switch to its window."
  (interactive)
  (if (not subprocess-running)
      (start-subprocess))
  (and subprocess-running
       (progn (pop-to-buffer subprocess-buf) (goto-char (point-max)))))

(defun command-send-input ()
  "If at last line of buffer, send the current line to
the spawned subprocess.  Otherwise bring back current
line to the last line for resubmission."
  (interactive)
  (beginning-of-line)
  (let ((current-line (buffer-substring (point) (line-end-position))))
    (if (eobp)
	(progn
	  (if (not subprocess-running)
	      (start-subprocess))
	  (if subprocess-running
	      (progn
		(beginning-of-line)
		(send-command-to-subprocess 1 current-line)
		(if command-prefix-string
		    (progn (beginning-of-line) (insert command-prefix-string)))
		(next-line 1))))
      ;; else -- if not at last line in buffer
      (goto-char (point-max))
      (backward-char)
      (next-line 1)
      (insert
       (if (compare-strings command-prefix-string nil nil
                            current-line 0 (length command-prefix-string))
           (substring current-line (length command-prefix-string))
         current-line)))))

(defun command-kill-line ()
  "Kill the current line.  Used in command mode."
  (interactive)
  (beginning-of-line)
  (kill-line))

(define-key esc-map "$" 'subprocess-command)

;; arch-tag: 600b2512-f903-4887-bcd2-e76b306f5b66
;;; vmsproc.el ends here