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