lisp/vms-patch.el

   1 ;;; vms-patch.el --- override parts of files.el for VMS.
   2
   3 ;; Copyright (C) 1986 Free Software Foundation, Inc.
   4
   5 ;; This file is part of GNU Emacs.
   6
   7 ;; GNU Emacs is free software; you can redistribute it and/or modify
   8 ;; it under the terms of the GNU General Public License as published by
   9 ;; the Free Software Foundation; either version 1, or (at your option)
  10 ;; any later version.
  11
  12 ;; GNU Emacs is distributed in the hope that it will be useful,
  13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ;; GNU General Public License for more details.
  16
  17 ;; You should have received a copy of the GNU General Public License
  18 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  19 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  20
  21
  22 ;;; Functions that need redefinition
  23
  24 ;;; VMS file names are upper case, but buffer names are more
  25 ;;; convenient in lower case.
  26
  27 (defun create-file-buffer (filename)
  28   "Create a suitably named buffer for visiting FILENAME, and return it.
  29 FILENAME (sans directory) is used unchanged if that name is free;
  30 otherwise a string <2> or <3> or ... is appended to get an unused name."
  31   (generate-new-buffer (downcase (file-name-nondirectory filename))))
  32
  33 ;;; Given a string FN, return a similar name which is a legal VMS filename.
  34 ;;; This is used to avoid invalid auto save file names.
  35 (defun make-legal-file-name (fn)
  36   (setq fn (copy-sequence fn))
  37   (let ((dot nil) (indx 0) (len (length fn)) chr)
  38     (while (< indx len)
  39       (setq chr (aref fn indx))
  40       (cond
  41        ((eq chr ?.) (if dot (aset fn indx ?_) (setq dot t)))
  42        ((not (or (and (>= chr ?a) (<= chr ?z)) (and (>= chr ?A) (<= chr ?Z))
  43                  (and (>= chr ?0) (<= chr ?9))
  44                  (eq chr ?$) (eq chr ?_) (and (eq chr ?-) (> indx 0))))
  45         (aset fn indx ?_)))
  46       (setq indx (1+ indx))))
  47   fn)
  48
  49 ;;; Auto save filesnames start with _$ and end with $.
  50
  51 (defun make-auto-save-file-name ()
  52   "Return file name to use for auto-saves of current buffer.
  53 Does not consider auto-save-visited-file-name; that is checked
  54 before calling this function.
  55 This is a separate function so your .emacs file or site-init.el can redefine it.
  56 See also auto-save-file-name-p."
  57   (if buffer-file-name
  58       (concat (file-name-directory buffer-file-name)
  59               "_$"
  60               (file-name-nondirectory buffer-file-name)
  61               "$")
  62     (expand-file-name (concat "_$_" (make-legal-file-name (buffer-name)) "$"))))
  63
  64 (defun auto-save-file-name-p (filename)
  65   "Return t if FILENAME can be yielded by make-auto-save-file-name.
  66 FILENAME should lack slashes.
  67 This is a separate function so your .emacs file or site-init.el can redefine it."
  68   (string-match "^_\\$.*\\$" filename))
  69
  70 (defun vms-suspend-resume-hook ()
  71   "When resuming suspended Emacs, check for file to be found.
  72 If the logical name `EMACS_FILE_NAME' is defined, `find-file' that file."
  73   (let ((file (vms-system-info "LOGICAL" "EMACS_FILE_NAME")))
  74     (if file (find-file file))))
  75
  76 (setq suspend-resume-hook 'vms-suspend-resume-hook)
  77
  78 (defun vms-suspend-hook ()
  79   "Don't allow suspending if logical name `DONT_SUSPEND_EMACS' is defined."
  80   (if (vms-system-info "LOGICAL" "DONT_SUSPEND_EMACS")
  81       (error "Can't suspend this emacs"))
  82   nil)
  83
  84 (setq suspend-hook 'vms-suspend-hook)
  85
  86 (defun vms-read-directory (dirname switches buffer)
  87   (save-excursion
  88     (set-buffer buffer)
  89     (subprocess-command-to-buffer
  90      (concat "DIRECTORY " switches " " dirname)
  91      buffer)
  92     (goto-char (point-min))
  93     ;; Remove all the trailing blanks.
  94     (while (search-forward " \n")
  95       (forward-char -1)
  96       (delete-horizontal-space))
  97     (goto-char (point-min))))
  98
  99 (setq dired-listing-switches
 100       "/SIZE/DATE/OWNER/WIDTH=(FILENAME=32,SIZE=5)")
 101
 102 (setq print-region-function
 103       '(lambda (start end command ign1 ign2 ign3 &rest switches)
 104          (write-region start end "sys$login:delete-me.txt")
 105          (send-command-to-subprocess
 106           1
 107           (concat command
 108                   " sys$login:delete-me.txt/name=""GNUprintbuffer"" "
 109                   (mapconcat 'identity switches " "))
 110           nil nil nil)))
 111
 112 ;;; vms-patch.el ends here