lisp/vms-patch.el

   1 ;;; vms-patch.el --- override parts of files.el for VMS.
   2
   3 ;; Maintainer: FSF
   4 ;; Last-Modified: 06 May 1992
   5
   6 ;; Copyright (C) 1986 Free Software Foundation, Inc.
   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
  22 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24 ;;; Code:
  25
  26 ;;; Functions that need redefinition
  27
  28 ;;; VMS file names are upper case, but buffer names are more
  29 ;;; convenient in lower case.
  30
  31 (defun create-file-buffer (filename)
  32   "Create a suitably named buffer for visiting FILENAME, and return it.
  33 FILENAME (sans directory) is used unchanged if that name is free;
  34 otherwise a string <2> or <3> or ... is appended to get an unused name."
  35   (generate-new-buffer (downcase (file-name-nondirectory filename))))
  36
  37 ;;; Given a string FN, return a similar name which is a legal VMS filename.
  38 ;;; This is used to avoid invalid auto save file names.
  39 (defun make-legal-file-name (fn)
  40   (setq fn (copy-sequence fn))
  41   (let ((dot nil) (indx 0) (len (length fn)) chr)
  42     (while (< indx len)
  43       (setq chr (aref fn indx))
  44       (cond
  45        ((eq chr ?.) (if dot (aset fn indx ?_) (setq dot t)))
  46        ((not (or (and (>= chr ?a) (<= chr ?z)) (and (>= chr ?A) (<= chr ?Z))
  47                  (and (>= chr ?0) (<= chr ?9))
  48                  (eq chr ?$) (eq chr ?_) (and (eq chr ?-) (> indx 0))))
  49         (aset fn indx ?_)))
  50       (setq indx (1+ indx))))
  51   fn)
  52
  53 ;;; Auto save filesnames start with _$ and end with $.
  54
  55 (defun make-auto-save-file-name ()
  56   "Return file name to use for auto-saves of current buffer.
  57 Does not consider auto-save-visited-file-name; that is checked
  58 before calling this function.
  59 This is a separate function so your .emacs file or site-init.el can redefine it.
  60 See also auto-save-file-name-p."
  61   (if buffer-file-name
  62       (concat (file-name-directory buffer-file-name)
  63               "_$"
  64               (file-name-nondirectory buffer-file-name)
  65               "$")
  66     (expand-file-name (concat "_$_" (make-legal-file-name (buffer-name)) "$"))))
  67
  68 (defun auto-save-file-name-p (filename)
  69   "Return t if FILENAME can be yielded by make-auto-save-file-name.
  70 FILENAME should lack slashes.
  71 This is a separate function so your .emacs file or site-init.el can redefine it."
  72   (string-match "^_\\$.*\\$" filename))
  73
  74 (defun vms-suspend-resume-hook ()
  75   "When resuming suspended Emacs, check for file to be found.
  76 If the logical name `EMACS_FILE_NAME' is defined, `find-file' that file."
  77   (let ((file (vms-system-info "LOGICAL" "EMACS_FILE_NAME")))
  78     (if file (find-file file))))
  79
  80 (setq suspend-resume-hook 'vms-suspend-resume-hook)
  81
  82 (defun vms-suspend-hook ()
  83   "Don't allow suspending if logical name `DONT_SUSPEND_EMACS' is defined."
  84   (if (vms-system-info "LOGICAL" "DONT_SUSPEND_EMACS")
  85       (error "Can't suspend this emacs"))
  86   nil)
  87
  88 (setq suspend-hook 'vms-suspend-hook)
  89
  90 (defun vms-read-directory (dirname switches buffer)
  91   (save-excursion
  92     (set-buffer buffer)
  93     (subprocess-command-to-buffer
  94      (concat "DIRECTORY " switches " " dirname)
  95      buffer)
  96     (goto-char (point-min))
  97     ;; Remove all the trailing blanks.
  98     (while (search-forward " \n")
  99       (forward-char -1)
 100       (delete-horizontal-space))
 101     (goto-char (point-min))))
 102
 103 (setq dired-listing-switches
 104       "/SIZE/DATE/OWNER/WIDTH=(FILENAME=32,SIZE=5)")
 105
 106 (setq print-region-function
 107       '(lambda (start end command ign1 ign2 ign3 &rest switches)
 108          (write-region start end "sys$login:delete-me.txt")
 109          (send-command-to-subprocess
 110           1
 111           (concat command
 112                   " sys$login:delete-me.txt/name=""GNUprintbuffer"" "
 113                   (mapconcat 'identity switches " "))
 114           nil nil nil)))
 115
 116 ;;; vms-patch.el ends here