| 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 |
| 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 | (defun subprocess-command-to-buffer (command buffer) |
| 76 | "Execute COMMAND and redirect output into BUFFER." |
| 77 | (let (cmd args) |
| 78 | (setq cmd (substring command 0 (string-match " " command))) |
| 79 | (setq args (substring command (string-match " " command))) |
| 80 | (call-process cmd nil buffer nil "*dcl*" args))) |
| 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 (concat "SYS$SCRATCH:OUTPUT-FOR-" |
| 87 | ; (getenv "USER") ".LISTING"))) |
| 88 | ; (while (file-exists-p output-filename) |
| 89 | ; (delete-file output-filename)) |
| 90 | ; (define-logical-name "SYS$OUTPUT" (concat output-filename "-NEW")) |
| 91 | ; (send-command-to-subprocess 1 command) |
| 92 | ; (send-command-to-subprocess 1 (concat |
| 93 | ; "RENAME " output-filename |
| 94 | ; "-NEW " output-filename)) |
| 95 | ; (while (not (file-exists-p output-filename)) |
| 96 | ; (sleep-for 1)) |
| 97 | ; (define-logical-name "SYS$OUTPUT" nil) |
| 98 | ; (insert-file output-filename) |
| 99 | ; (delete-file output-filename)))) |
| 100 | |
| 101 | (defun subprocess-command () |
| 102 | "Starts asynchronous subprocess if not running and switches to its window." |
| 103 | (interactive) |
| 104 | (if (not subprocess-running) |
| 105 | (start-subprocess)) |
| 106 | (and subprocess-running |
| 107 | (progn (pop-to-buffer subprocess-buf) (goto-char (point-max))))) |
| 108 | |
| 109 | (defun command-send-input () |
| 110 | "If at last line of buffer, sends the current line to |
| 111 | the spawned subprocess. Otherwise brings back current |
| 112 | line to the last line for resubmission." |
| 113 | (interactive) |
| 114 | (beginning-of-line) |
| 115 | (let ((current-line (buffer-substring (point) |
| 116 | (progn (end-of-line) (point))))) |
| 117 | (if (eobp) |
| 118 | (progn |
| 119 | (if (not subprocess-running) |
| 120 | (start-subprocess)) |
| 121 | (if subprocess-running |
| 122 | (progn |
| 123 | (beginning-of-line) |
| 124 | (send-command-to-subprocess 1 current-line) |
| 125 | (if command-prefix-string |
| 126 | (progn (beginning-of-line) (insert command-prefix-string))) |
| 127 | (next-line 1)))) |
| 128 | ;; else -- if not at last line in buffer |
| 129 | (end-of-buffer) |
| 130 | (backward-char) |
| 131 | (next-line 1) |
| 132 | (if (string-equal command-prefix-string |
| 133 | (substring current-line 0 (length command-prefix-string))) |
| 134 | (insert (substring current-line (length command-prefix-string))) |
| 135 | (insert current-line))))) |
| 136 | |
| 137 | (defun command-kill-line() |
| 138 | "Kills the current line. Used in command mode." |
| 139 | (interactive) |
| 140 | (beginning-of-line) |
| 141 | (kill-line)) |
| 142 | |
| 143 | (define-key esc-map "$" 'subprocess-command) |
| 144 | |
| 145 | ;;; vmsproc.el ends here |