Initial revision

lisp/vms-patch.el

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+;; Override parts of files.el for VMS.
+;; Copyright (C) 1986 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 1, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to
+;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+
+;;; 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)
+
+(defun vms-read-directory (dirname switches buffer)
+  (save-excursion
+    (set-buffer buffer)
+    (subprocess-command-to-buffer
+     (concat "DIRECTORY " switches " " dirname)
+     buffer)
+    (goto-char (point-min))
+    ;; Remove all the trailing blanks.
+    (while (search-forward " \n")
+      (forward-char -1)
+      (delete-horizontal-space))
+    (goto-char (point-min))))
+
+(setq dired-listing-switches
+      "/SIZE/DATE/OWNER/WIDTH=(FILENAME=32,SIZE=5)")