rbr4@uhura.cc.rochester.edu (Roland Roberts) (08/16/89)
Below is a copy of the file vms-patch.el. To get VMS dired to work
you will need my corrections to dired.el (already sent out),
vms-patch.el (this file), and vmsproc.el (should arrive about the same
time as this). Put them in the [lisp] directory and byte-compile
them.
roland
--- Cut here ---
;; Override parts of files.el for VMS.
;; Copyright (C) 1986 Free Software Foundation, Inc.
;; This file is part of GNU Emacs.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY. No author or distributor
;; accepts responsibility to anyone for the consequences of using it
;; or for whether it serves any particular purpose or works at all,
;; unless he says so in writing. Refer to the GNU Emacs General Public
;; License for full details.
;; Everyone is granted permission to copy, modify and redistribute
;; GNU Emacs, but only under the conditions described in the
;; GNU Emacs General Public License. A copy of this license is
;; supposed to have been given to you along with GNU Emacs so you
;; can know your rights and responsibilities. It should be in a
;; file named COPYING. Among other things, the copyright notice
;; and this notice must be preserved on all copies.
;;; Functions that need redefinition
;;; VMS file names are upper case, but buffer names are more
;;; convenient in lower case.
(defun create-file-buffer (filename)
"Create a suitably named buffer for visiting FILENAME, and return it.
FILENAME (sans directory) is used unchanged if that name is free;
otherwise a string <2> or <3> or ... is appended to get an unused name."
(generate-new-buffer (downcase (file-name-nondirectory filename))))
;;; Given a string FN, return a similar name which is a legal VMS filename.
;;; This is used to avoid invalid auto save file names.
(defun make-legal-file-name (fn)
(setq fn (copy-sequence fn))
(let ((dot nil) (indx 0) (len (length fn)) chr)
(while (< indx len)
(setq chr (aref fn indx))
(cond
((eq chr ?.) (if dot (aset fn indx ?_) (setq dot t)))
((not (or (and (>= chr ?a) (<= chr ?z)) (and (>= chr ?A) (<= chr ?Z))
(and (>= chr ?0) (<= chr ?9))
(eq chr ?$) (eq chr ?_) (and (eq chr ?-) (> indx 0))))
(aset fn indx ?_)))
(setq indx (1+ indx))))
fn)
;;; Auto save filesnames start with _$ and end with $.
(defun make-auto-save-file-name ()
"Return file name to use for auto-saves of current buffer.
Does not consider auto-save-visited-file-name; that is checked before calling
this function. This is a separate function so your .emacs file or site-init.el
can redefine it. See also auto-save-file-name-p."
(if buffer-file-name
(concat (file-name-directory buffer-file-name)
"_$"
(file-name-nondirectory buffer-file-name)
"$")
(expand-file-name
(concat "_$_" (make-legal-file-name (buffer-name)) "$"))))
(defun auto-save-file-name-p (filename)
"Return t if FILENAME can be yielded by make-auto-save-file-name.
FILENAME should lack slashes. This is a separate function so your .emacs file
or site-init.el can redefine it."
(string-match "^_\\$.*\\$" filename))
(defun vms-suspend-resume-hook ()
"When resuming suspended Emacs, check for file to be found.
If the logical name `EMACS_FILE_NAME' is defined, `find-file' that file."
(let ((file (vms-system-info "LOGICAL" "EMACS_FILE_NAME")))
(if file (find-file file))))
(setq suspend-resume-hook 'vms-suspend-resume-hook)
(defun vms-suspend-hook ()
"Don't allow suspending if logical name `DONT_SUSPEND_EMACS' is defined."
(if (vms-system-info "LOGICAL" "DONT_SUSPEND_EMACS")
(error "Can't suspend this emacs"))
nil)
(setq suspend-hook 'vms-suspend-hook)
--
Roland Roberts BITNET: roberts@uornsrl
Nuclear Structure Research Lab INTERNET: rbr4@uhura.cc.rochester.edu
271 East River Road UUCP: rochester!ur-cc!uhura!rbr4
Rochester, NY 14267 AT&T: (716) 275-8962