lisp/vms-patch.el

   1 ;;; vms-patch.el --- override parts of files.el for VMS
   2
   3 ;; Copyright (C) 1986, 1992 Free Software Foundation, Inc.
   4
   5 ;; Maintainer: FSF
   6 ;; Keywords: vms
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;;; Commentary:
  26
  27 ;;; Code:
  28
  29 (setq auto-mode-alist (cons '(("\\.com\\'" . dcl-mode)) auto-mode-alist))
  30
  31 ;;; Functions that need redefinition
  32
  33 ;;; VMS file names are upper case, but buffer names are more
  34 ;;; convenient in lower case.
  35
  36 (defun create-file-buffer (filename)
  37   "Create a suitably named buffer for visiting FILENAME, and return it.
  38 FILENAME (sans directory) is used unchanged if that name is free;
  39 otherwise a string <2> or <3> or ... is appended to get an unused name."
  40   (generate-new-buffer (downcase (file-name-nondirectory filename))))
  41
  42 ;;; Given a string FN, return a similar name which is a legal VMS filename.
  43 ;;; This is used to avoid invalid auto save file names.
  44 (defun make-legal-file-name (fn)
  45   (setq fn (copy-sequence fn))
  46   (let ((dot nil) (indx 0) (len (length fn)) chr)
  47     (while (< indx len)
  48       (setq chr (aref fn indx))
  49       (cond
  50        ((eq chr ?.) (if dot (aset fn indx ?_) (setq dot t)))
  51        ((not (or (and (>= chr ?a) (<= chr ?z)) (and (>= chr ?A) (<= chr ?Z))
  52                  (and (>= chr ?0) (<= chr ?9))
  53                  (eq chr ?$) (eq chr ?_) (and (eq chr ?-) (> indx 0))))
  54         (aset fn indx ?_)))
  55       (setq indx (1+ indx))))
  56   fn)
  57
  58 ;;; Auto save filesnames start with _$ and end with $.
  59
  60 (defun make-auto-save-file-name ()
  61   "Return file name to use for auto-saves of current buffer.
  62 This function does not consider `auto-save-visited-file-name';
  63 the caller should check that before calling this function.
  64 This is a separate function so that your `.emacs' file or the site's
  65 `site-init.el' can redefine it.
  66 See also `auto-save-file-name-p'."
  67   (if buffer-file-name
  68       (concat (file-name-directory buffer-file-name)
  69               "_$"
  70               (file-name-nondirectory buffer-file-name)
  71               "$")
  72     (expand-file-name (concat "_$_" (make-legal-file-name (buffer-name)) "$"))))
  73
  74 (defun auto-save-file-name-p (filename)
  75   "Return t if FILENAME can be yielded by `make-auto-save-file-name'.
  76 FILENAME should lack slashes.
  77 This is a separate function so that your `.emacs' file or the site's
  78 `site-init.el' can redefine it."
  79   (string-match "^_\\$.*\\$" filename))
  80
  81 ;;;
  82 ;;; This goes along with kepteditor.com which defines these logicals
  83 ;;; If EMACS_COMMAND_ARGS is defined, it supersedes EMACS_FILE_NAME,
  84 ;;;   which is probably set up incorrectly anyway.
  85 ;;; The function command-line-again is a kludge, but it does the job.
  86 ;;;
  87 (defun vms-suspend-resume-hook ()
  88   "When resuming suspended Emacs, check for file to be found.
  89 If the logical name `EMACS_FILE_NAME' is defined, `find-file' that file."
  90   (let ((file (vms-system-info "LOGICAL" "EMACS_FILE_NAME"))
  91         (args (vms-system-info "LOGICAL" "EMACS_COMMAND_ARGS"))
  92         (line (vms-system-info "LOGICAL" "EMACS_FILE_LINE")))
  93     (if (not args)
  94         (if file
  95             (progn (find-file file)
  96                    (if line (goto-line (string-to-int line)))))
  97       (cd (file-name-directory file))
  98       (vms-command-line-again))))
  99
 100 (setq suspend-resume-hook 'vms-suspend-resume-hook)
 101
 102 (defun vms-suspend-hook ()
 103   "Don't allow suspending if logical name `DONT_SUSPEND_EMACS' is defined."
 104   (if (vms-system-info "LOGICAL" "DONT_SUSPEND_EMACS")
 105       (error "Can't suspend this emacs"))
 106   nil)
 107
 108 (setq suspend-hook 'vms-suspend-hook)
 109
 110 ;;;
 111 ;;; A kludge that allows reprocessing of the command line.  This is mostly
 112 ;;;   to allow a spawned VMS mail process to do something reasonable when
 113 ;;;   used in conjunction with the modifications to sysdep.c that allow
 114 ;;;   Emacs to attach to a "foster" parent.
 115 ;;;
 116 (defun vms-command-line-again ()
 117   "Reprocess command line arguments.  VMS specific.
 118 Command line arguments are initialized from the logical EMACS_COMMAND_ARGS
 119 which is defined by kepteditor.com.  On VMS this allows attaching to a
 120 spawned Emacs and doing things like \"emacs -l myfile.el -f doit\""
 121   (let* ((args (downcase (vms-system-info "LOGICAL" "EMACS_COMMAND_ARGS")))
 122          (command-line-args (list "emacs"))
 123          (beg 0)
 124          (end 0)
 125          (len (length args))
 126          this-char)
 127     (if args
 128         (progn
 129 ;;; replace non-printable stuff with spaces
 130           (while (< beg (length args))
 131             (if (or (> 33 (setq this-char (aref args beg)))
 132                     (< 127 this-char))
 133                 (aset args beg 32))
 134             (setq beg (1+ beg)))
 135           (setq beg (1- (length args)))
 136           (while (= 32 (aref args beg)) (setq beg (1- beg)))
 137           (setq args (substring args 0 (1+ beg)))
 138           (setq beg 0)
 139 ;;; now start parsing args
 140           (while (< beg (length args))
 141             (while (and (< beg (length args))
 142                         (or (> 33 (setq this-char (aref args beg)))
 143                             (< 127 this-char))
 144                         (setq beg (1+ beg))))
 145             (setq end (1+ beg))
 146             (while (and (< end (length args))
 147                         (< 32 (setq this-char (aref args end)))
 148                         (> 127 this-char))
 149               (setq end (1+ end)))
 150             (setq command-line-args (append
 151                                      command-line-args
 152                                      (list (substring args beg end))))
 153             (setq beg (1+ end)))
 154           (command-line)))))
 155
 156 (defun vms-read-directory (dirname switches buffer)
 157   (save-excursion
 158     (set-buffer buffer)
 159     (subprocess-command-to-buffer
 160      (concat "DIRECTORY " switches " " dirname)
 161      buffer)
 162     (goto-char (point-min))
 163     ;; Remove all the trailing blanks.
 164     (while (search-forward " \n")
 165       (forward-char -1)
 166       (delete-horizontal-space))
 167     (goto-char (point-min))))
 168
 169 (setq dired-listing-switches
 170       "/SIZE/DATE/OWNER/WIDTH=(FILENAME=32,SIZE=5)")
 171
 172 (setq print-region-function
 173       (lambda (start end command ign1 ign2 ign3 &rest switches)
 174          (write-region start end "sys$login:delete-me.txt")
 175          (send-command-to-subprocess
 176           1
 177           (concat command
 178                   " sys$login:delete-me.txt/name=\"GNUprintbuffer\" "
 179                   (mapconcat 'identity switches " "))
 180           nil nil nil)))
 181
 182 ;;;
 183 ;;; Fuctions for using Emacs as a VMS Mail editor
 184 ;;;
 185 (autoload 'vms-pmail-setup "vms-pmail"
 186   "Set up file assuming use by VMS Mail utility.
 187 The buffer is put into text-mode, auto-save is turned off and the
 188 following bindings are established.
 189
 190 \\[vms-pmail-save-and-exit]     vms-pmail-save-and-exit
 191 \\[vms-pmail-abort]     vms-pmail-abort
 192
 193 All other Emacs commands are still available."
 194   t)
 195
 196 ;;; vms-patch.el ends here