lisp/vms-patch.el

   1 ;;; vms-patch.el --- override parts of files.el for VMS
   2
   3 ;; Copyright (C) 1986, 1992, 2002, 2003, 2004,
   4 ;;   2005, 2006 Free Software Foundation, Inc.
   5
   6 ;; Maintainer: FSF
   7 ;; Keywords: vms
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 2, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  24 ;; Boston, MA 02110-1301, USA.
  25
  26 ;;; Commentary:
  27
  28 ;;; Code:
  29
  30 (setq auto-mode-alist (cons '(("\\.com\\'" . dcl-mode)) auto-mode-alist))
  31
  32 ;;; Functions that need redefinition
  33
  34 ;;; VMS file names are upper case, but buffer names are more
  35 ;;; convenient in lower case.
  36
  37 (defun create-file-buffer (filename)
  38   "Create a suitably named buffer for visiting FILENAME, and return it.
  39 FILENAME (sans directory) is used unchanged if that name is free;
  40 otherwise a string <2> or <3> or ... is appended to get an unused name."
  41   (generate-new-buffer (downcase (file-name-nondirectory filename))))
  42
  43 ;;; Given a string FN, return a similar name which is a legal VMS filename.
  44 ;;; This is used to avoid invalid auto save file names.
  45 (defun make-legal-file-name (fn)
  46   (setq fn (copy-sequence fn))
  47   (let ((dot nil) (indx 0) (len (length fn)) chr)
  48     (while (< indx len)
  49       (setq chr (aref fn indx))
  50       (cond
  51        ((eq chr ?.) (if dot (aset fn indx ?_) (setq dot t)))
  52        ((not (or (and (>= chr ?a) (<= chr ?z)) (and (>= chr ?A) (<= chr ?Z))
  53                  (and (>= chr ?0) (<= chr ?9))
  54                  (eq chr ?$) (eq chr ?_) (and (eq chr ?-) (> indx 0))))
  55         (aset fn indx ?_)))
  56       (setq indx (1+ indx))))
  57   fn)
  58
  59 ;;; Auto save filesnames start with _$ and end with $.
  60
  61 (defun make-auto-save-file-name ()
  62   "Return file name to use for auto-saves of current buffer.
  63 This function does not consider `auto-save-visited-file-name';
  64 the caller should check that before calling this function.
  65 This is a separate function so that your `.emacs' file or the site's
  66 `site-init.el' can redefine it.
  67 See also `auto-save-file-name-p'."
  68   (if buffer-file-name
  69       (concat (file-name-directory buffer-file-name)
  70               "_$"
  71               (file-name-nondirectory buffer-file-name)
  72               "$")
  73     (expand-file-name (concat "_$_" (make-legal-file-name (buffer-name)) "$"))))
  74
  75 (defun auto-save-file-name-p (filename)
  76   "Return t if FILENAME can be yielded by `make-auto-save-file-name'.
  77 FILENAME should lack slashes.
  78 This is a separate function so that your `.emacs' file or the site's
  79 `site-init.el' can redefine it."
  80   (string-match "^_\\$.*\\$" filename))
  81
  82 ;;;
  83 ;;; This goes along with kepteditor.com which defines these logicals
  84 ;;; If EMACS_COMMAND_ARGS is defined, it supersedes EMACS_FILE_NAME,
  85 ;;;   which is probably set up incorrectly anyway.
  86 ;;; The function command-line-again is a kludge, but it does the job.
  87 ;;;
  88 (defun vms-suspend-resume-hook ()
  89   "When resuming suspended Emacs, check for file to be found.
  90 If the logical name `EMACS_FILE_NAME' is defined, `find-file' that file."
  91   (let ((file (vms-system-info "LOGICAL" "EMACS_FILE_NAME"))
  92         (args (vms-system-info "LOGICAL" "EMACS_COMMAND_ARGS"))
  93         (line (vms-system-info "LOGICAL" "EMACS_FILE_LINE")))
  94     (if (not args)
  95         (if file
  96             (progn (find-file file)
  97                    (if line (goto-line (string-to-number line)))))
  98       (cd (file-name-directory file))
  99       (vms-command-line-again))))
 100
 101 (setq suspend-resume-hook 'vms-suspend-resume-hook)
 102
 103 (defun vms-suspend-hook ()
 104   "Don't allow suspending if logical name `DONT_SUSPEND_EMACS' is defined."
 105   (if (vms-system-info "LOGICAL" "DONT_SUSPEND_EMACS")
 106       (error "Can't suspend this emacs"))
 107   nil)
 108
 109 (setq suspend-hook 'vms-suspend-hook)
 110
 111 ;;;
 112 ;;; A kludge that allows reprocessing of the command line.  This is mostly
 113 ;;;   to allow a spawned VMS mail process to do something reasonable when
 114 ;;;   used in conjunction with the modifications to sysdep.c that allow
 115 ;;;   Emacs to attach to a "foster" parent.
 116 ;;;
 117 (defun vms-command-line-again ()
 118   "Reprocess command line arguments.  VMS specific.
 119 Command line arguments are initialized from the logical EMACS_COMMAND_ARGS
 120 which is defined by kepteditor.com.  On VMS this allows attaching to a
 121 spawned Emacs and doing things like \"emacs -l myfile.el -f doit\""
 122   (let* ((args (downcase (vms-system-info "LOGICAL" "EMACS_COMMAND_ARGS")))
 123          (command-line-args (list "emacs"))
 124          (beg 0)
 125          (end 0)
 126          (len (length args))
 127          this-char)
 128     (if args
 129         (progn
 130 ;;; replace non-printable stuff with spaces
 131           (while (< beg (length args))
 132             (if (or (> 33 (setq this-char (aref args beg)))
 133                     (< 127 this-char))
 134                 (aset args beg 32))
 135             (setq beg (1+ beg)))
 136           (setq beg (1- (length args)))
 137           (while (= 32 (aref args beg)) (setq beg (1- beg)))
 138           (setq args (substring args 0 (1+ beg)))
 139           (setq beg 0)
 140 ;;; now start parsing args
 141           (while (< beg (length args))
 142             (while (and (< beg (length args))
 143                         (or (> 33 (setq this-char (aref args beg)))
 144                             (< 127 this-char))
 145                         (setq beg (1+ beg))))
 146             (setq end (1+ beg))
 147             (while (and (< end (length args))
 148                         (< 32 (setq this-char (aref args end)))
 149                         (> 127 this-char))
 150               (setq end (1+ end)))
 151             (setq command-line-args (append
 152                                      command-line-args
 153                                      (list (substring args beg end))))
 154             (setq beg (1+ end)))
 155           (command-line)))))
 156
 157 (defun vms-read-directory (dirname switches buffer)
 158   (save-excursion
 159     (set-buffer buffer)
 160     (subprocess-command-to-buffer
 161      (concat "DIRECTORY " switches " " dirname)
 162      buffer)
 163     (goto-char (point-min))
 164     ;; Remove all the trailing blanks.
 165     (while (search-forward " \n")
 166       (forward-char -1)
 167       (delete-horizontal-space))
 168     (goto-char (point-min))))
 169
 170 (setq dired-listing-switches
 171       "/SIZE/DATE/OWNER/WIDTH=(FILENAME=32,SIZE=5)")
 172
 173 (setq print-region-function
 174       (lambda (start end command ign1 ign2 ign3 &rest switches)
 175          (write-region start end "sys$login:delete-me.txt")
 176          (send-command-to-subprocess
 177           1
 178           (concat command
 179                   " sys$login:delete-me.txt/name=\"GNUprintbuffer\" "
 180                   (mapconcat 'identity switches " "))
 181           nil nil nil)))
 182
 183 ;;;
 184 ;;; Fuctions for using Emacs as a VMS Mail editor
 185 ;;;
 186 (autoload 'vms-pmail-setup "vms-pmail"
 187   "Set up file assuming use by VMS Mail utility.
 188 The buffer is put into text-mode, auto-save is turned off and the
 189 following bindings are established.
 190
 191 \\[vms-pmail-save-and-exit]     vms-pmail-save-and-exit
 192 \\[vms-pmail-abort]     vms-pmail-abort
 193
 194 All other Emacs commands are still available."
 195   t)
 196
 197 ;;;
 198 ;;; Filename handling in the minibuffer
 199 ;;;
 200 (defun vms-magic-right-square-brace ()
 201   "\
 202 Insert a right square brace, but do other things first depending on context.
 203 During filename completion, when point is at the end of the line and the
 204 character before is not a right square brace, do one of three things before
 205 inserting the brace:
 206  - If there are already two left square braces preceding, do nothing special.
 207  - If there is a previous right-square-brace, convert it to dot.
 208  - If the character before is dot, delete it.
 209 Additionally, if the preceding chars are right-square-brace followed by
 210 either \"-\" or \"..\", strip one level of directory hierarchy."
 211   (interactive)
 212   (when (and minibuffer-completing-file-name
 213              (= (point) (point-max))
 214              (not (= 93 (char-before))))
 215     (cond
 216      ;; Avoid clobbering: user:[one.path][another.path
 217      ((search-backward "[" (field-beginning) t 2))
 218      ((search-backward "]" (field-beginning) t)
 219       (delete-char 1)
 220       (insert ".")
 221       (goto-char (point-max)))
 222      ((= ?. (char-before))
 223       (delete-char -1)))
 224     (goto-char (point-max))
 225     (let ((specs '(".." "-"))
 226           (pmax (point-max)))
 227       (while specs
 228         (let* ((up (car specs))
 229                (len (length up))
 230                (cut (- (point) len)))
 231           (when (and (< (1+ len) pmax)
 232                      (= ?. (char-before cut))
 233                      (string= up (buffer-substring cut (point))))
 234             (delete-char (- (1+ len)))
 235             (while (not (let ((c (char-before)))
 236                           (or (= ?. c) (= 91 c))))
 237               (delete-char -1))
 238             (when (= ?. (char-before)) (delete-char -1))
 239             (setq specs nil)))
 240         (setq specs (cdr specs)))))
 241   (insert "]"))
 242
 243 (defun vms-magic-colon ()
 244   "\
 245 Insert a colon, but do other things first depending on context.
 246 During filename completion, when point is at the end of the line
 247 and the line contains a right square brace, remove all characters
 248 from the beginning of the line up to and including such brace.
 249 This enables one to type a new filespec without having to delete
 250 the old one."
 251   (interactive)
 252   (when (and minibuffer-completing-file-name
 253              (= (point) (point-max))
 254              (search-backward "]" (field-beginning) t))
 255     (delete-region (field-beginning) (1+ (point)))
 256     (goto-char (point-max)))
 257   (insert ":"))
 258
 259 (let ((m minibuffer-local-completion-map))
 260   (define-key m "]" 'vms-magic-right-square-brace)
 261   (define-key m "/" 'vms-magic-right-square-brace)
 262   (define-key m ":" 'vms-magic-colon))
 263
 264 ;;; arch-tag: c178494e-2c37-4d02-99b7-e47e615656cf
 265 ;;; vms-patch.el ends here