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 ;;; Code:
  26
  27 ;;; Functions that need redefinition
  28
  29 ;;; VMS file names are upper case, but buffer names are more
  30 ;;; convenient in lower case.
  31
  32 (defun create-file-buffer (filename)
  33   "Create a suitably named buffer for visiting FILENAME, and return it.
  34 FILENAME (sans directory) is used unchanged if that name is free;
  35 otherwise a string <2> or <3> or ... is appended to get an unused name."
  36   (generate-new-buffer (downcase (file-name-nondirectory filename))))
  37
  38 ;;; Given a string FN, return a similar name which is a legal VMS filename.
  39 ;;; This is used to avoid invalid auto save file names.
  40 (defun make-legal-file-name (fn)
  41   (setq fn (copy-sequence fn))
  42   (let ((dot nil) (indx 0) (len (length fn)) chr)
  43     (while (< indx len)
  44       (setq chr (aref fn indx))
  45       (cond
  46        ((eq chr ?.) (if dot (aset fn indx ?_) (setq dot t)))
  47        ((not (or (and (>= chr ?a) (<= chr ?z)) (and (>= chr ?A) (<= chr ?Z))
  48                  (and (>= chr ?0) (<= chr ?9))
  49                  (eq chr ?$) (eq chr ?_) (and (eq chr ?-) (> indx 0))))
  50         (aset fn indx ?_)))
  51       (setq indx (1+ indx))))
  52   fn)
  53
  54 ;;; Auto save filesnames start with _$ and end with $.
  55
  56 (defun make-auto-save-file-name ()
  57   "Return file name to use for auto-saves of current buffer.
  58 This function does not consider `auto-save-visited-file-name';
  59 the caller should check that before calling this function.
  60 This is a separate function so that your `.emacs' file or the site's
  61 `site-init.el' can redefine it.
  62 See also `auto-save-file-name-p'."
  63   (if buffer-file-name
  64       (concat (file-name-directory buffer-file-name)
  65               "_$"
  66               (file-name-nondirectory buffer-file-name)
  67               "$")
  68     (expand-file-name (concat "_$_" (make-legal-file-name (buffer-name)) "$"))))
  69
  70 (defun auto-save-file-name-p (filename)
  71   "Return t if FILENAME can be yielded by `make-auto-save-file-name'.
  72 FILENAME should lack slashes.
  73 This is a separate function so that your `.emacs' file or the site's
  74 `site-init.el' can redefine it."
  75   (string-match "^_\\$.*\\$" filename))
  76
  77 ;;;
  78 ;;; This goes along with kepteditor.com which defines these logicals
  79 ;;; If EMACS_COMMAND_ARGS is defined, it supersedes EMACS_FILE_NAME,
  80 ;;;   which is probably set up incorrectly anyway.
  81 ;;; The function command-line-again is a kludge, but it does the job.
  82 ;;;
  83 (defun vms-suspend-resume-hook ()
  84   "When resuming suspended Emacs, check for file to be found.
  85 If the logical name `EMACS_FILE_NAME' is defined, `find-file' that file."
  86   (let ((file (vms-system-info "LOGICAL" "EMACS_FILE_NAME"))
  87         (args (vms-system-info "LOGICAL" "EMACS_COMMAND_ARGS"))
  88         (line (vms-system-info "LOGICAL" "EMACS_FILE_LINE")))
  89     (if (not args)
  90         (if file
  91             (progn (find-file file)
  92                    (if line (goto-line (string-to-int line)))))
  93       (cd (file-name-directory file))
  94       (vms-command-line-again))))
  95
  96 (setq suspend-resume-hook 'vms-suspend-resume-hook)
  97
  98 (defun vms-suspend-hook ()
  99   "Don't allow suspending if logical name `DONT_SUSPEND_EMACS' is defined."
 100   (if (vms-system-info "LOGICAL" "DONT_SUSPEND_EMACS")
 101       (error "Can't suspend this emacs"))
 102   nil)
 103
 104 (setq suspend-hook 'vms-suspend-hook)
 105
 106 ;;;
 107 ;;; A kludge that allows reprocessing of the command line.  This is mostly
 108 ;;;   to allow a spawned VMS mail process to do something reasonable when
 109 ;;;   used in conjunction with the modifications to sysdep.c that allow
 110 ;;;   Emacs to attach to a "foster" parent.
 111 ;;;
 112 (defun vms-command-line-again ()
 113   "Reprocess command line arguments.  VMS specific.
 114 Command line arguments are initialized from the logical EMACS_COMMAND_ARGS
 115 which is defined by kepteditor.com.  On VMS this allows attaching to a
 116 spawned Emacs and doing things like \"emacs -l myfile.el -f doit\""
 117   (let* ((args (downcase (vms-system-info "LOGICAL" "EMACS_COMMAND_ARGS")))
 118          (command-line-args (list "emacs"))
 119          (beg 0)
 120          (end 0)
 121          (len (length args))
 122          this-char)
 123     (if args
 124         (progn
 125 ;;; replace non-printable stuff with spaces
 126           (while (< beg (length args))
 127             (if (or (> 33 (setq this-char (aref args beg)))
 128                     (< 127 this-char))
 129                 (aset args beg 32))
 130             (setq beg (1+ beg)))
 131           (setq beg (1- (length args)))
 132           (while (= 32 (aref args beg)) (setq beg (1- beg)))
 133           (setq args (substring args 0 (1+ beg)))
 134           (setq beg 0)
 135 ;;; now start parsing args
 136           (while (< beg (length args))
 137             (while (and (< beg (length args))
 138                         (or (> 33 (setq this-char (aref args beg)))
 139                             (< 127 this-char))
 140                         (setq beg (1+ beg))))
 141             (setq end (1+ beg))
 142             (while (and (< end (length args))
 143                         (< 32 (setq this-char (aref args end)))
 144                         (> 127 this-char))
 145               (setq end (1+ end)))
 146             (setq command-line-args (append
 147                                      command-line-args
 148                                      (list (substring args beg end))))
 149             (setq beg (1+ end)))
 150           (command-line)))))
 151
 152 (defun vms-read-directory (dirname switches buffer)
 153   (save-excursion
 154     (set-buffer buffer)
 155     (subprocess-command-to-buffer
 156      (concat "DIRECTORY " switches " " dirname)
 157      buffer)
 158     (goto-char (point-min))
 159     ;; Remove all the trailing blanks.
 160     (while (search-forward " \n")
 161       (forward-char -1)
 162       (delete-horizontal-space))
 163     (goto-char (point-min))))
 164
 165 (setq dired-listing-switches
 166       "/SIZE/DATE/OWNER/WIDTH=(FILENAME=32,SIZE=5)")
 167
 168 (setq print-region-function
 169       '(lambda (start end command ign1 ign2 ign3 &rest switches)
 170          (write-region start end "sys$login:delete-me.txt")
 171          (send-command-to-subprocess
 172           1
 173           (concat command
 174                   " sys$login:delete-me.txt/name=\"GNUprintbuffer\" "
 175                   (mapconcat 'identity switches " "))
 176           nil nil nil)))
 177
 178 ;;;
 179 ;;; Fuctions for using Emacs as a VMS Mail editor
 180 ;;;
 181 (autoload 'vms-pmail-setup "vms-pmail"
 182   "Set up file assuming use by VMS Mail utility.
 183 The buffer is put into text-mode, auto-save is turned off and the
 184 following bindings are established.
 185
 186 \\[vms-pmail-save-and-exit]     vms-pmail-save-and-exit
 187 \\[vms-pmail-abort]     vms-pmail-abort
 188
 189 All other Emacs commands are still available."
 190   t)
 191
 192 ;;; vms-patch.el ends here