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