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Annotation of 43BSDReno/contrib/emacs-18.55/lisp/vms-patch.el, revision 1.1.1.1

1.1       root        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 distributed in the hope that it will be useful,
                      7: ;; but WITHOUT ANY WARRANTY.  No author or distributor
                      8: ;; accepts responsibility to anyone for the consequences of using it
                      9: ;; or for whether it serves any particular purpose or works at all,
                     10: ;; unless he says so in writing.  Refer to the GNU Emacs General Public
                     11: ;; License for full details.
                     12: 
                     13: ;; Everyone is granted permission to copy, modify and redistribute
                     14: ;; GNU Emacs, but only under the conditions described in the
                     15: ;; GNU Emacs General Public License.   A copy of this license is
                     16: ;; supposed to have been given to you along with GNU Emacs so you
                     17: ;; can know your rights and responsibilities.  It should be in a
                     18: ;; file named COPYING.  Among other things, the copyright notice
                     19: ;; and this notice must be preserved on all copies.
                     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)

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