lisp/vmsx.el

   1 ;;; vmsx.el --- run asynchronous VMS subprocesses under Emacs
   2
   3 ;; Copyright (C) 1986 Free Software Foundation, Inc.
   4
   5 ;; This file is part of GNU Emacs.
   6
   7 ;; GNU Emacs is free software; you can redistribute it and/or modify
   8 ;; it under the terms of the GNU General Public License as published by
   9 ;; the Free Software Foundation; either version 1, or (at your option)
  10 ;; any later version.
  11
  12 ;; GNU Emacs is distributed in the hope that it will be useful,
  13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ;; GNU General Public License for more details.
  16
  17 ;; You should have received a copy of the GNU General Public License
  18 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  19 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  20
  21 ;; Written by Mukesh Prasad.
  22
  23 (defvar display-subprocess-window nil
  24   "If non-nil, the suprocess window is displayed whenever input is received.")
  25
  26 (defvar command-prefix-string "$ "
  27   "String to insert to distinguish commands entered by user.")
  28
  29 (defvar subprocess-running nil)
  30 (defvar command-mode-map nil)
  31
  32 (if command-mode-map
  33     nil
  34   (setq command-mode-map (make-sparse-keymap))
  35   (define-key command-mode-map "\C-m" 'command-send-input)
  36   (define-key command-mode-map "\C-u" 'command-kill-line))
  37
  38 (defun subprocess-input (name str)
  39    "Handles input from a subprocess.  Called by Emacs."
  40    (if display-subprocess-window
  41       (display-buffer subprocess-buf))
  42    (let ((old-buffer (current-buffer)))
  43       (set-buffer subprocess-buf)
  44       (goto-char (point-max))
  45       (insert str)
  46       (insert ?\n)
  47       (set-buffer old-buffer)))
  48
  49 (defun subprocess-exit (name)
  50    "Called by Emacs upon subprocess exit."
  51    (setq subprocess-running nil))
  52
  53 (defun start-subprocess ()
  54    "Spawns an asynchronous subprocess with output redirected to
  55 the buffer *COMMAND*.  Within this buffer, use C-m to send
  56 the last line to the subprocess or to bring another line to
  57 the end."
  58    (if subprocess-running
  59        (return t))
  60    (setq subprocess-buf (get-buffer-create "*COMMAND*"))
  61    (save-excursion
  62         (set-buffer subprocess-buf)
  63         (use-local-map command-mode-map))
  64    (setq subprocess-running (spawn-subprocess 1 'subprocess-input
  65                                                'subprocess-exit))
  66    ;; Initialize subprocess so it doesn't panic and die upon
  67    ;; encountering the first error.
  68    (and subprocess-running
  69         (send-command-to-subprocess 1 "ON SEVERE_ERROR THEN CONTINUE")))
  70
  71 (defvar subprocess-command-to-buffer-tmpdir "SYS$SCRATCH:"
  72   "*Put temporary files from subprocess-command-to-buffer here.")
  73
  74 (defun subprocess-command-to-buffer (command buffer)
  75   "Execute command and redirect output into buffer.
  76
  77 BUGS: only the output up to the end of the first image activation is trapped."
  78   (if (not subprocess-running)
  79           (start-subprocess))
  80   (save-excursion
  81         (set-buffer buffer)
  82         (let ((output-filename
  83                (concat subprocess-command-to-buffer-tmpdir
  84                        "OUTPUT-FOR-" (getenv "USER") ".LISTING")))
  85           (while (file-attributes output-filename)
  86             (delete-file output-filename))
  87           (send-command-to-subprocess 1 (concat "DEFINE/USER SYS$OUTPUT "
  88                                                 output-filename "-NEW"))
  89           (send-command-to-subprocess 1 command)
  90           (send-command-to-subprocess 1 (concat "RENAME " output-filename
  91                                                 "-NEW " output-filename))
  92           (while (not (file-attributes output-filename))
  93             (sleep-for 2))
  94           (insert-file output-filename))))
  95
  96 (defun subprocess-command ()
  97   "Starts asynchronous subprocess if not running and switches to its window."
  98   (interactive)
  99   (if (not subprocess-running)
 100       (start-subprocess))
 101   (and subprocess-running
 102       (progn (pop-to-buffer subprocess-buf) (goto-char (point-max)))))
 103
 104 (defun command-send-input ()
 105   "If at last line of buffer, sends the current line to
 106 the spawned subprocess.  Otherwise brings back current
 107 line to the last line for resubmission."
 108   (interactive)
 109   (beginning-of-line)
 110   (let ((current-line (buffer-substring (point)
 111                                         (progn (end-of-line) (point)))))
 112     (if (eobp)
 113       (progn
 114         (if (not subprocess-running)
 115             (start-subprocess))
 116         (if subprocess-running
 117           (progn
 118             (beginning-of-line)
 119             (send-command-to-subprocess 1 current-line)
 120             (if command-prefix-string
 121               (progn (beginning-of-line) (insert command-prefix-string)))
 122             (next-line 1))))
 123       ;; else -- if not at last line in buffer
 124       (end-of-buffer)
 125       (backward-char)
 126       (next-line 1)
 127       (if (string-equal command-prefix-string
 128                 (substring current-line 0 (length command-prefix-string)))
 129           (insert (substring current-line (length command-prefix-string)))
 130           (insert current-line)))))
 131
 132 (defun command-kill-line()
 133   "Kills the current line.  Used in command mode."
 134   (interactive)
 135   (beginning-of-line)
 136   (kill-line))
 137
 138 (define-key esc-map "$" 'subprocess-command)
 139
 140 ;;; vmsx.el ends here