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;; vmsproc.el --- 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")))
(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))
; (save-excursion
; (set-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$OUTPUT" nil)
; (insert-file output-filename)
; (delete-file output-filename))))
(defun subprocess-command ()
"Starts asynchronous subprocess if not running and switches to its window."
(interactive)
(if (not subprocess-running)
(start-subprocess))
(and subprocess-running
(progn (pop-to-buffer subprocess-buf) (goto-char (point-max)))))
(defun command-send-input ()
"If at last line of buffer, sends the current line to
the spawned subprocess. Otherwise brings back current
line to the last line for resubmission."
(interactive)
(beginning-of-line)
(let ((current-line (buffer-substring (point)
(progn (end-of-line) (point)))))
(if (eobp)
(progn
(if (not subprocess-running)
(start-subprocess))
(if subprocess-running
(progn
(beginning-of-line)
(send-command-to-subprocess 1 current-line)
(if command-prefix-string
(progn (beginning-of-line) (insert command-prefix-string)))
(next-line 1))))
;; else -- if not at last line in buffer
(end-of-buffer)
(backward-char)
(next-line 1)
(if (string-equal command-prefix-string
(substring current-line 0 (length command-prefix-string)))
(insert (substring current-line (length command-prefix-string)))
(insert current-line)))))
(defun command-kill-line()
"Kills the current line. Used in command mode."
(interactive)
(beginning-of-line)
(kill-line))
(define-key esc-map "$" 'subprocess-command)
;;; vmsproc.el ends here
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