lisp/vms-patch.el

   1 ;;; vms-patch.el --- override parts of files.el for VMS.
   2
   3 ;; Copyright (C) 1986, 1992 Free Software Foundation, Inc.
   4
   5 ;; Maintainer: FSF
   6 ;; Keywords: vms
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  22 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24 ;;; Code:
  25
  26 ;;; Functions that need redefinition
  27
  28 ;;; VMS file names are upper case, but buffer names are more
  29 ;;; convenient in lower case.
  30
  31 (defun create-file-buffer (filename)
  32   "Create a suitably named buffer for visiting FILENAME, and return it.
  33 FILENAME (sans directory) is used unchanged if that name is free;
  34 otherwise a string <2> or <3> or ... is appended to get an unused name."
  35   (generate-new-buffer (downcase (file-name-nondirectory filename))))
  36
  37 ;;; Given a string FN, return a similar name which is a legal VMS filename.
  38 ;;; This is used to avoid invalid auto save file names.
  39 (defun make-legal-file-name (fn)
  40   (setq fn (copy-sequence fn))
  41   (let ((dot nil) (indx 0) (len (length fn)) chr)
  42     (while (< indx len)
  43       (setq chr (aref fn indx))
  44       (cond
  45        ((eq chr ?.) (if dot (aset fn indx ?_) (setq dot t)))
  46        ((not (or (and (>= chr ?a) (<= chr ?z)) (and (>= chr ?A) (<= chr ?Z))
  47                  (and (>= chr ?0) (<= chr ?9))
  48                  (eq chr ?$) (eq chr ?_) (and (eq chr ?-) (> indx 0))))
  49         (aset fn indx ?_)))
  50       (setq indx (1+ indx))))
  51   fn)
  52
  53 ;;; Auto save filesnames start with _$ and end with $.
  54
  55 (defun make-auto-save-file-name ()
  56   "Return file name to use for auto-saves of current buffer.
  57 Does not consider auto-save-visited-file-name; that is checked
  58 before calling this function.
  59 This is a separate function so your .emacs file or site-init.el can redefine it.
  60 See also auto-save-file-name-p."
  61   (if buffer-file-name
  62       (concat (file-name-directory buffer-file-name)
  63               "_$"
  64               (file-name-nondirectory buffer-file-name)
  65               "$")
  66     (expand-file-name (concat "_$_" (make-legal-file-name (buffer-name)) "$"))))
  67
  68 (defun auto-save-file-name-p (filename)
  69   "Return t if FILENAME can be yielded by make-auto-save-file-name.
  70 FILENAME should lack slashes.
  71 This is a separate function so your .emacs file or site-init.el can redefine it."
  72   (string-match "^_\\$.*\\$" filename))
  73
  74 ;;;
  75 ;;; This goes along with kepteditor.com which defines these logicals
  76 ;;; If EMACS_COMMAND_ARGS is defined, it supersedes EMACS_FILE_NAME,
  77 ;;;   which is probably set up incorrectly anyway.
  78 ;;; The function command-line-again is a kludge, but it does the job.
  79 ;;;
  80 (defun vms-suspend-resume-hook ()
  81   "When resuming suspended Emacs, check for file to be found.
  82 If the logical name `EMACS_FILE_NAME' is defined, `find-file' that file."
  83   (let ((file (vms-system-info "LOGICAL" "EMACS_FILE_NAME"))
  84         (args (vms-system-info "LOGICAL" "EMACS_COMMAND_ARGS"))
  85         (line (vms-system-info "LOGICAL" "EMACS_FILE_LINE")))
  86     (if (not args)
  87         (if file
  88             (progn (find-file file)
  89                    (if line (goto-line (string-to-int line)))))
  90       (cd (file-name-directory file))
  91       (vms-command-line-again))))
  92
  93 (setq suspend-resume-hook 'vms-suspend-resume-hook)
  94
  95 (defun vms-suspend-hook ()
  96   "Don't allow suspending if logical name `DONT_SUSPEND_EMACS' is defined."
  97   (if (vms-system-info "LOGICAL" "DONT_SUSPEND_EMACS")
  98       (error "Can't suspend this emacs"))
  99   nil)
 100
 101 (setq suspend-hook 'vms-suspend-hook)
 102
 103 ;;;
 104 ;;; A kludge that allows reprocessing of the command line.  This is mostly
 105 ;;;   to allow a spawned VMS mail process to do something reasonable when
 106 ;;;   used in conjunction with the modifications to sysdep.c that allow
 107 ;;;   Emacs to attach to a "foster" parent.
 108 ;;;
 109 (defun vms-command-line-again ()
 110   "Reprocess command line arguments.  VMS specific.
 111 Command line arguments are initialized from the logical EMACS_COMMAND_ARGS
 112 which is defined by kepteditor.com.  On VMS this allows attaching to a
 113 spawned Emacs and doing things like \"emacs -l myfile.el -f doit\""
 114   (let* ((args (downcase (vms-system-info "LOGICAL" "EMACS_COMMAND_ARGS")))
 115          (command-line-args (list "emacs"))
 116          (beg 0)
 117          (end 0)
 118          (len (length args))
 119          this-char)
 120     (if args
 121         (progn
 122 ;;; replace non-printable stuff with spaces
 123           (while (< beg (length args))
 124             (if (or (> 33 (setq this-char (aref args beg)))
 125                     (< 127 this-char))
 126                 (aset args beg 32))
 127             (setq beg (1+ beg)))
 128           (setq beg (1- (length args)))
 129           (while (= 32 (aref args beg)) (setq beg (1- beg)))
 130           (setq args (substring args 0 (1+ beg)))
 131           (setq beg 0)
 132 ;;; now start parsing args
 133           (while (< beg (length args))
 134             (while (and (< beg (length args))
 135                         (or (> 33 (setq this-char (aref args beg)))
 136                             (< 127 this-char))
 137                         (setq beg (1+ beg))))
 138             (setq end (1+ beg))
 139             (while (and (< end (length args))
 140                         (< 32 (setq this-char (aref args end)))
 141                         (> 127 this-char))
 142               (setq end (1+ end)))
 143             (setq command-line-args (append
 144                                      command-line-args
 145                                      (list (substring args beg end))))
 146             (setq beg (1+ end)))
 147           (command-line)))))
 148
 149 (defun vms-read-directory (dirname switches buffer)
 150   (save-excursion
 151     (set-buffer buffer)
 152     (subprocess-command-to-buffer
 153      (concat "DIRECTORY " switches " " dirname)
 154      buffer)
 155     (goto-char (point-min))
 156     ;; Remove all the trailing blanks.
 157     (while (search-forward " \n")
 158       (forward-char -1)
 159       (delete-horizontal-space))
 160     (goto-char (point-min))))
 161
 162 (setq dired-listing-switches
 163       "/SIZE/DATE/OWNER/WIDTH=(FILENAME=32,SIZE=5)")
 164
 165 (setq print-region-function
 166       '(lambda (start end command ign1 ign2 ign3 &rest switches)
 167          (write-region start end "sys$login:delete-me.txt")
 168          (send-command-to-subprocess
 169           1
 170           (concat command
 171                   " sys$login:delete-me.txt/name=\"GNUprintbuffer\" "
 172                   (mapconcat 'identity switches " "))
 173           nil nil nil)))
 174
 175 ;;;
 176 ;;; Fuctions for using Emacs as a VMS Mail editor
 177 ;;;
 178 (autoload 'vms-pmail-setup "vms-pmail"
 179   "Set up file assuming use by VMS Mail utility.
 180 The buffer is put into text-mode, auto-save is turned off and the
 181 following bindings are established.
 182
 183 \\[vms-pmail-save-and-exit]     vms-pmail-save-and-exit
 184 \\[vms-pmail-abort]     vms-pmail-abort
 185
 186 All other Emacs commands are still available."
 187   t)
 188
 189 ;;; vms-patch.el ends here