lisp/vms-patch.el

   1 ;; Override parts of files.el for VMS.
   2 ;; Copyright (C) 1986 Free Software Foundation, Inc.
   3
   4 ;; This file is part of GNU Emacs.
   5
   6 ;; GNU Emacs is free software; you can redistribute it and/or modify
   7 ;; it under the terms of the GNU General Public License as published by
   8 ;; the Free Software Foundation; either version 1, or (at your option)
   9 ;; any later version.
  10
  11 ;; GNU Emacs is distributed in the hope that it will be useful,
  12 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 ;; GNU General Public License for more details.
  15
  16 ;; You should have received a copy of the GNU General Public License
  17 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  18 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  19
  20
  21 ;;; Functions that need redefinition
  22
  23 ;;; VMS file names are upper case, but buffer names are more
  24 ;;; convenient in lower case.
  25
  26 (defun create-file-buffer (filename)
  27   "Create a suitably named buffer for visiting FILENAME, and return it.
  28 FILENAME (sans directory) is used unchanged if that name is free;
  29 otherwise a string <2> or <3> or ... is appended to get an unused name."
  30   (generate-new-buffer (downcase (file-name-nondirectory filename))))
  31
  32 ;;; Given a string FN, return a similar name which is a legal VMS filename.
  33 ;;; This is used to avoid invalid auto save file names.
  34 (defun make-legal-file-name (fn)
  35   (setq fn (copy-sequence fn))
  36   (let ((dot nil) (indx 0) (len (length fn)) chr)
  37     (while (< indx len)
  38       (setq chr (aref fn indx))
  39       (cond
  40        ((eq chr ?.) (if dot (aset fn indx ?_) (setq dot t)))
  41        ((not (or (and (>= chr ?a) (<= chr ?z)) (and (>= chr ?A) (<= chr ?Z))
  42                  (and (>= chr ?0) (<= chr ?9))
  43                  (eq chr ?$) (eq chr ?_) (and (eq chr ?-) (> indx 0))))
  44         (aset fn indx ?_)))
  45       (setq indx (1+ indx))))
  46   fn)
  47
  48 ;;; Auto save filesnames start with _$ and end with $.
  49
  50 (defun make-auto-save-file-name ()
  51   "Return file name to use for auto-saves of current buffer.
  52 Does not consider auto-save-visited-file-name; that is checked
  53 before calling this function.
  54 This is a separate function so your .emacs file or site-init.el can redefine it.
  55 See also auto-save-file-name-p."
  56   (if buffer-file-name
  57       (concat (file-name-directory buffer-file-name)
  58               "_$"
  59               (file-name-nondirectory buffer-file-name)
  60               "$")
  61     (expand-file-name (concat "_$_" (make-legal-file-name (buffer-name)) "$"))))
  62
  63 (defun auto-save-file-name-p (filename)
  64   "Return t if FILENAME can be yielded by make-auto-save-file-name.
  65 FILENAME should lack slashes.
  66 This is a separate function so your .emacs file or site-init.el can redefine it."
  67   (string-match "^_\\$.*\\$" filename))
  68
  69 (defun vms-suspend-resume-hook ()
  70   "When resuming suspended Emacs, check for file to be found.
  71 If the logical name `EMACS_FILE_NAME' is defined, `find-file' that file."
  72   (let ((file (vms-system-info "LOGICAL" "EMACS_FILE_NAME")))
  73     (if file (find-file file))))
  74
  75 (setq suspend-resume-hook 'vms-suspend-resume-hook)
  76
  77 (defun vms-suspend-hook ()
  78   "Don't allow suspending if logical name `DONT_SUSPEND_EMACS' is defined."
  79   (if (vms-system-info "LOGICAL" "DONT_SUSPEND_EMACS")
  80       (error "Can't suspend this emacs"))
  81   nil)
  82
  83 (setq suspend-hook 'vms-suspend-hook)
  84
  85 (defun vms-read-directory (dirname switches buffer)
  86   (save-excursion
  87     (set-buffer buffer)
  88     (subprocess-command-to-buffer
  89      (concat "DIRECTORY " switches " " dirname)
  90      buffer)
  91     (goto-char (point-min))
  92     ;; Remove all the trailing blanks.
  93     (while (search-forward " \n")
  94       (forward-char -1)
  95       (delete-horizontal-space))
  96     (goto-char (point-min))))
  97
  98 (setq dired-listing-switches
  99       "/SIZE/DATE/OWNER/WIDTH=(FILENAME=32,SIZE=5)")
 100
 101 (setq print-region-function
 102       '(lambda (start end command ign1 ign2 ign3 &rest switches)
 103          (write-region start end "sys$login:delete-me.txt")
 104          (send-command-to-subprocess
 105           1
 106           (concat command
 107                   " sys$login:delete-me.txt/name=""GNUprintbuffer"" "
 108                   (mapconcat 'identity switches " "))
 109           nil nil nil)))