lisp/vmsproc.el

   1 ;;; vmsproc.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 the
  23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  24 ;; Boston, MA 02111-1307, USA.
  25
  26 ;;; Commentary:
  27
  28 ;;; Code:
  29
  30 (defvar display-subprocess-window nil
  31   "If non-nil, the subprocess window is displayed whenever input is received.")
  32
  33 (defvar command-prefix-string "$ "
  34   "String to insert to distinguish commands entered by user.")
  35
  36 (defvar subprocess-running nil)
  37 (defvar command-mode-map nil)
  38
  39 (if command-mode-map
  40     nil
  41   (setq command-mode-map (make-sparse-keymap))
  42   (define-key command-mode-map "\C-m" 'command-send-input)
  43   (define-key command-mode-map "\C-u" 'command-kill-line))
  44
  45 (defun subprocess-input (name str)
  46   "Handles input from a subprocess.  Called by Emacs."
  47   (if display-subprocess-window
  48       (display-buffer subprocess-buf))
  49   (let ((old-buffer (current-buffer)))
  50     (set-buffer subprocess-buf)
  51     (goto-char (point-max))
  52     (insert str)
  53     (insert ?\n)
  54     (set-buffer old-buffer)))
  55
  56 (defun subprocess-exit (name)
  57   "Called by Emacs upon subprocess exit."
  58   (setq subprocess-running nil))
  59
  60 (defun start-subprocess ()
  61   "Spawns an asynchronous subprocess with output redirected to
  62 the buffer *COMMAND*.  Within this buffer, use C-m to send
  63 the last line to the subprocess or to bring another line to
  64 the end."
  65   (if subprocess-running
  66       (return t))
  67   (setq subprocess-buf (get-buffer-create "*COMMAND*"))
  68   (save-excursion
  69     (set-buffer subprocess-buf)
  70     (use-local-map command-mode-map))
  71   (setq subprocess-running (spawn-subprocess 1 'subprocess-input
  72                                              'subprocess-exit))
  73   ;; Initialize subprocess so it doesn't panic and die upon
  74   ;; encountering the first error.
  75   (and subprocess-running
  76        (send-command-to-subprocess 1 "ON SEVERE_ERROR THEN CONTINUE")))
  77
  78 (defun subprocess-command-to-buffer (command buffer)
  79   "Execute COMMAND and redirect output into BUFFER."
  80   (let (cmd args)
  81     (setq cmd (substring command 0 (string-match " " command)))
  82     (setq args (substring command (string-match " " command)))
  83     (call-process cmd nil buffer nil "*dcl*" args)))
  84 ;BUGS: only the output up to the end of the first image activation is trapped.
  85 ;  (if (not subprocess-running)
  86 ;      (start-subprocess))
  87 ;  (save-excursion
  88 ;    (set-buffer buffer)
  89 ;    (let ((output-filename (concat "SYS$SCRATCH:OUTPUT-FOR-"
  90 ;                                  (getenv "USER") ".LISTING")))
  91 ;      (while (file-exists-p output-filename)
  92 ;       (delete-file output-filename))
  93 ;      (define-logical-name "SYS$OUTPUT" (concat output-filename "-NEW"))
  94 ;      (send-command-to-subprocess 1 command)
  95 ;      (send-command-to-subprocess 1 (concat
  96 ;                                    "RENAME " output-filename
  97 ;                                    "-NEW " output-filename))
  98 ;      (while (not (file-exists-p output-filename))
  99 ;       (sleep-for 1))
 100 ;      (define-logical-name "SYS$OUTPUT" nil)
 101 ;      (insert-file output-filename)
 102 ;      (delete-file output-filename))))
 103
 104 (defun subprocess-command ()
 105   "Starts asynchronous subprocess if not running and switches to its window."
 106   (interactive)
 107   (if (not subprocess-running)
 108       (start-subprocess))
 109   (and subprocess-running
 110        (progn (pop-to-buffer subprocess-buf) (goto-char (point-max)))))
 111
 112 (defun command-send-input ()
 113   "If at last line of buffer, sends the current line to
 114 the spawned subprocess.  Otherwise brings back current
 115 line to the last line for resubmission."
 116   (interactive)
 117   (beginning-of-line)
 118   (let ((current-line (buffer-substring (point)
 119                                         (progn (end-of-line) (point)))))
 120     (if (eobp)
 121         (progn
 122           (if (not subprocess-running)
 123               (start-subprocess))
 124           (if subprocess-running
 125               (progn
 126                 (beginning-of-line)
 127                 (send-command-to-subprocess 1 current-line)
 128                 (if command-prefix-string
 129                     (progn (beginning-of-line) (insert command-prefix-string)))
 130                 (next-line 1))))
 131       ;; else -- if not at last line in buffer
 132       (end-of-buffer)
 133       (backward-char)
 134       (next-line 1)
 135       (if (string-equal command-prefix-string
 136                         (substring current-line 0 (length command-prefix-string)))
 137           (insert (substring current-line (length command-prefix-string)))
 138         (insert current-line)))))
 139
 140 (defun command-kill-line()
 141   "Kills the current line.  Used in command mode."
 142   (interactive)
 143   (beginning-of-line)
 144   (kill-line))
 145
 146 (define-key esc-map "$" 'subprocess-command)
 147
 148 ;;; vmsproc.el ends here