lisp/vmsx.el

   1 ;;; vmsx.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 GNU Emacs.
  10
  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.
  15
  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.
  20
  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
  23 ;; the Free 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 (defvar subprocess-command-to-buffer-tmpdir "SYS$SCRATCH:"
  76   "*Put temporary files from subprocess-command-to-buffer here.")
  77
  78 (defun subprocess-command-to-buffer (command buffer)
  79   "Execute command and redirect output into buffer.
  80
  81 BUGS: only the output up to the end of the first image activation is trapped."
  82   (if (not subprocess-running)
  83           (start-subprocess))
  84   (save-excursion
  85         (set-buffer buffer)
  86         (let ((output-filename
  87                (concat subprocess-command-to-buffer-tmpdir
  88                        "OUTPUT-FOR-" (getenv "USER") ".LISTING")))
  89           (while (file-attributes output-filename)
  90             (delete-file output-filename))
  91           (send-command-to-subprocess 1 (concat "DEFINE/USER SYS$OUTPUT "
  92                                                 output-filename "-NEW"))
  93           (send-command-to-subprocess 1 command)
  94           (send-command-to-subprocess 1 (concat "RENAME " output-filename
  95                                                 "-NEW " output-filename))
  96           (while (not (file-attributes output-filename))
  97             (sleep-for 2))
  98           (insert-file output-filename))))
  99
 100 (defun subprocess-command ()
 101   "Starts asynchronous subprocess if not running and switches to its window."
 102   (interactive)
 103   (if (not subprocess-running)
 104       (start-subprocess))
 105   (and subprocess-running
 106       (progn (pop-to-buffer subprocess-buf) (goto-char (point-max)))))
 107
 108 (defun command-send-input ()
 109   "If at last line of buffer, sends the current line to
 110 the spawned subprocess.  Otherwise brings back current
 111 line to the last line for resubmission."
 112   (interactive)
 113   (beginning-of-line)
 114   (let ((current-line (buffer-substring (point)
 115                                         (progn (end-of-line) (point)))))
 116     (if (eobp)
 117       (progn
 118         (if (not subprocess-running)
 119             (start-subprocess))
 120         (if subprocess-running
 121           (progn
 122             (beginning-of-line)
 123             (send-command-to-subprocess 1 current-line)
 124             (if command-prefix-string
 125               (progn (beginning-of-line) (insert command-prefix-string)))
 126             (next-line 1))))
 127       ;; else -- if not at last line in buffer
 128       (end-of-buffer)
 129       (backward-char)
 130       (next-line 1)
 131       (if (string-equal command-prefix-string
 132                 (substring current-line 0 (length command-prefix-string)))
 133           (insert (substring current-line (length command-prefix-string)))
 134           (insert current-line)))))
 135
 136 (defun command-kill-line()
 137   "Kills the current line.  Used in command mode."
 138   (interactive)
 139   (beginning-of-line)
 140   (kill-line))
 141
 142 (define-key esc-map "$" 'subprocess-command)
 143
 144 ;;; vmsx.el ends here