code.delx.au - gnu-emacs/blob - lisp/vmsproc.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 (defun subprocess-command-to-buffer (command buffer)
  72   "Execute COMMAND and redirect output into BUFFER."
  73   (let (cmd args)
  74     (setq cmd (substring command 0 (string-match " " command)))
  75     (setq args (substring command (string-match " " command)))
  76     (call-process cmd nil buffer nil "*dcl*" args)))
  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 (concat "SYS$SCRATCH:OUTPUT-FOR-"
  83 ;                                  (getenv "USER") ".LISTING")))
  84 ;      (while (file-exists-p output-filename)
  85 ;       (delete-file output-filename))
  86 ;      (define-logical-name "SYS$OUTPUT" (concat output-filename "-NEW"))
  87 ;      (send-command-to-subprocess 1 command)
  88 ;      (send-command-to-subprocess 1 (concat
  89 ;                                    "RENAME " output-filename
  90 ;                                    "-NEW " output-filename))
  91 ;      (while (not (file-exists-p output-filename))
  92 ;       (sleep-for 1))
  93 ;      (define-logical-name "SYS$OUTPUT" nil)
  94 ;      (insert-file output-filename)
  95 ;      (delete-file output-filename))))
  96
  97 (defun subprocess-command ()
  98   "Starts asynchronous subprocess if not running and switches to its window."
  99   (interactive)
 100   (if (not subprocess-running)
 101       (start-subprocess))
 102   (and subprocess-running
 103        (progn (pop-to-buffer subprocess-buf) (goto-char (point-max)))))
 104
 105 (defun command-send-input ()
 106   "If at last line of buffer, sends the current line to
 107 the spawned subprocess.  Otherwise brings back current
 108 line to the last line for resubmission."
 109   (interactive)
 110   (beginning-of-line)
 111   (let ((current-line (buffer-substring (point)
 112                                         (progn (end-of-line) (point)))))
 113     (if (eobp)
 114         (progn
 115           (if (not subprocess-running)
 116               (start-subprocess))
 117           (if subprocess-running
 118               (progn
 119                 (beginning-of-line)
 120                 (send-command-to-subprocess 1 current-line)
 121                 (if command-prefix-string
 122                     (progn (beginning-of-line) (insert command-prefix-string)))
 123                 (next-line 1))))
 124       ;; else -- if not at last line in buffer
 125       (end-of-buffer)
 126       (backward-char)
 127       (next-line 1)
 128       (if (string-equal command-prefix-string
 129                         (substring current-line 0 (length command-prefix-string)))
 130           (insert (substring current-line (length command-prefix-string)))
 131         (insert current-line)))))
 132
 133 (defun command-kill-line()
 134   "Kills the current line.  Used in command mode."
 135   (interactive)
 136   (beginning-of-line)
 137   (kill-line))
 138
 139 (define-key esc-map "$" 'subprocess-command)