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+;; Run asynchronous VMS subprocesses under Emacs
+;; Copyright (C) 1986 Free Software Foundation, Inc.
+
+;; 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+;; Written by Mukesh Prasad.
+
+(defvar display-subprocess-window nil
+  "If non-nil, the suprocess 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 command-mode-map nil)
+
+(if command-mode-map
+    nil
+  (setq command-mode-map (make-sparse-keymap))
+  (define-key command-mode-map "\C-m" 'command-send-input)
+  (define-key command-mode-map "\C-u" 'command-kill-line))
+
+(defun subprocess-input (name str)
+   "Handles input from a subprocess.  Called by Emacs."
+   (if display-subprocess-window
+      (display-buffer subprocess-buf))
+   (let ((old-buffer (current-buffer)))
+      (set-buffer subprocess-buf)
+      (goto-char (point-max))
+      (insert str)
+      (insert ?\n)
+      (set-buffer old-buffer)))
+
+(defun subprocess-exit (name)
+   "Called by Emacs upon subprocess exit."
+   (setq subprocess-running nil))
+
+(defun start-subprocess ()
+   "Spawns 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*"))
+   (save-excursion
+	(set-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")))
+
+(defvar subprocess-command-to-buffer-tmpdir "SYS$SCRATCH:"
+  "*Put temporary files from subprocess-command-to-buffer here.")
+
+(defun subprocess-command-to-buffer (command buffer)
+  "Execute command and redirect output into buffer.
+
+BUGS: only the output up to the end of the first image activation is trapped."
+  (if (not subprocess-running) 
+	  (start-subprocess))
+  (save-excursion
+	(set-buffer buffer)
+	(let ((output-filename
+	       (concat subprocess-command-to-buffer-tmpdir
+		       "OUTPUT-FOR-" (getenv "USER") ".LISTING")))
+	  (while (file-attributes output-filename)
+	    (delete-file output-filename))
+	  (send-command-to-subprocess 1 (concat "DEFINE/USER SYS$OUTPUT "
+						output-filename "-NEW"))
+	  (send-command-to-subprocess 1 command)
+	  (send-command-to-subprocess 1 (concat "RENAME " output-filename 
+						"-NEW " output-filename))
+	  (while (not (file-attributes output-filename))
+	    (sleep-for 2))
+	  (insert-file output-filename))))
+
+(defun subprocess-command ()
+  "Starts asynchronous subprocess if not running and switches 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, sends the current line to
+the spawned subprocess.  Otherwise brings back current
+line to the last line for resubmission."
+  (interactive)
+  (beginning-of-line)
+  (let ((current-line (buffer-substring (point)
+                                        (progn (end-of-line) (point)))))
+    (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
+      (end-of-buffer)
+      (backward-char)
+      (next-line 1)
+      (if (string-equal command-prefix-string
+                (substring current-line 0 (length command-prefix-string)))
+	  (insert (substring current-line (length command-prefix-string)))
+          (insert current-line)))))
+
+(defun command-kill-line()
+  "Kills the current line.  Used in command mode."
+  (interactive)
+  (beginning-of-line)
+  (kill-line))
+
+(define-key esc-map "$" 'subprocess-command)