code.delx.au - gnu-emacs/blob - lisp/dos-w32.el

   1 ;;; dos-w32.el --- Functions shared among MS-DOS and W32 (NT/95) platforms
   2
   3 ;; Copyright (C) 1996 Free Software Foundation, Inc.
   4
   5 ;; Maintainer: Geoff Voelker (voelker@cs.washington.edu)
   6 ;; Keywords: internal
   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 the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;;; Commentary:
  26
  27 ;; Parts of this code are duplicated functions taken from dos-fns.el
  28 ;; and winnt.el.
  29
  30 ;;; Code:
  31
  32 ;;; Add %t: into the mode line format just after the open-paren.
  33 (let ((tail (member "   %[(" mode-line-format)))
  34   (setcdr tail (cons (purecopy "%t:")
  35                      (cdr tail))))
  36
  37 ;; Use ";" instead of ":" as a path separator (from files.el).
  38 (setq path-separator ";")
  39
  40 ;; Set the null device (for compile.el).
  41 (setq grep-null-device "NUL")
  42
  43 ;; Set the grep regexp to match entries with drive letters.
  44 (setq grep-regexp-alist
  45   '(("^\\(\\([a-zA-Z]:\\)?[^:( \t\n]+\\)[:( \t]+\\([0-9]+\\)[:) \t]" 1 3)))
  46
  47 ;; For distinguishing file types based upon suffixes.
  48 (defvar file-name-buffer-file-type-alist
  49   '(
  50     ("[:/].*config.sys$" . nil)         ; config.sys text
  51     ("\\.elc$" . t)                     ; emacs stuff
  52     ("\\.\\(obj\\|exe\\|com\\|lib\\|sys\\|chk\\|out\\|bin\\|ico\\|pif\\)$" . t)
  53                                         ; MS-Dos stuff
  54     ("\\.\\(arc\\|zip\\|pak\\|lzh\\|zoo\\)$" . t)
  55                                         ; Packers
  56     ("\\.\\(a\\|o\\|tar\\|z\\|gz\\|taz\\)$" . t)
  57                                         ; Unix stuff
  58     ("\\.tp[ulpw]$" . t)
  59                                         ; Borland Pascal stuff
  60     ("[:/]tags$" . t)
  61                                         ; Emacs TAGS file
  62     )
  63   "*Alist for distinguishing text files from binary files.
  64 Each element has the form (REGEXP . TYPE), where REGEXP is matched
  65 against the file name, and TYPE is nil for text, t for binary.")
  66
  67 ;; Return the pair matching filename on file-name-buffer-file-type-alist,
  68 ;; or nil otherwise.
  69 (defun find-buffer-file-type-match (filename)
  70   (let ((alist file-name-buffer-file-type-alist)
  71         (found nil))
  72     (let ((case-fold-search t))
  73       (setq filename (file-name-sans-versions filename))
  74       (while (and (not found) alist)
  75         (if (string-match (car (car alist)) filename)
  76             (setq found (car alist)))
  77         (setq alist (cdr alist)))
  78       found)))
  79
  80 (defun find-buffer-file-type (filename)
  81   ;; First check if file is on an untranslated filesystem, then on the alist.
  82   (if (untranslated-file-p filename)
  83       t ; for binary
  84     (let ((match (find-buffer-file-type-match filename))
  85           (code))
  86       (if (not match)
  87           default-buffer-file-type
  88         (setq code (cdr match))
  89         (cond ((memq code '(nil t)) code)
  90               ((and (symbolp code) (fboundp code))
  91                (funcall code filename)))))))
  92
  93 (defun find-buffer-file-type-coding-system (command args)
  94   "Choose a coding system for a file operation.
  95 If COMMAND is 'insert-file-contents', the coding system is chosen based
  96 upon the filename, the contents of 'untranslated-filesystem-list' and
  97 'file-name-buffer-file-type-alist', and whether the file exists:
  98
  99   If it matches in 'untranslated-filesystem-list':      'no-conversion'
 100   If it matches in 'file-name-buffer-file-type-alist':
 101     If the match is t (for binary):                     'no-conversion'
 102     If the match is nil (for text):                     'emacs-mule-dos'
 103   Otherwise:
 104     If the file exists:                                 'undecided'
 105     If the file does not exist:                         'emacs-mule-dos'
 106
 107 If COMMAND is 'write-region', the coding system is chosen based
 108 upon the value of 'buffer-file-type': If t, the coding system is
 109 'no-conversion', otherwise it is 'emacs-mule-dos'."
 110   (let ((op (nth 0 command))
 111         (target)
 112         (binary)
 113         (undecided nil))
 114     (cond ((eq op 'insert-file-contents)
 115            (setq target (nth 1 command))
 116            (setq binary (find-buffer-file-type target))
 117            (if (not binary)
 118                (setq undecided
 119                      (and (file-exists-p target)
 120                           (not (find-buffer-file-type-match target))))))
 121           ((eq op 'write-region)
 122            (setq binary buffer-file-type)))
 123     (cond (binary '(no-conversion . no-conversion))
 124           (undecided '(undecided . undecided))
 125           (t '(emacs-mule-dos . emacs-mule-dos)))))
 126
 127 (modify-coding-system-alist 'file "" 'find-buffer-file-type-coding-system)
 128
 129 (defun find-file-binary (filename)
 130   "Visit file FILENAME and treat it as binary."
 131   (interactive "FFind file binary: ")
 132   (let ((file-name-buffer-file-type-alist '(("" . t))))
 133     (find-file filename)))
 134
 135 (defun find-file-text (filename)
 136   "Visit file FILENAME and treat it as a text file."
 137   (interactive "FFind file text: ")
 138   (let ((file-name-buffer-file-type-alist '(("" . nil))))
 139     (find-file filename)))
 140
 141 (defun find-file-not-found-set-buffer-file-type ()
 142   (save-excursion
 143     (set-buffer (current-buffer))
 144     (setq buffer-file-type (find-buffer-file-type (buffer-file-name))))
 145   nil)
 146
 147 ;;; To set the default file type on new files.
 148 (add-hook 'find-file-not-found-hooks 'find-file-not-found-set-buffer-file-type)
 149
 150
 151 ;;; To accomodate filesystems that do not require CR/LF translation.
 152 (defvar untranslated-filesystem-list nil
 153   "List of filesystems that require no CR/LF translation when reading
 154 and writing files.  Each filesystem in the list is a string naming
 155 the directory prefix corresponding to the filesystem.")
 156
 157 (defun untranslated-canonical-name (filename)
 158   "Return FILENAME in a canonicalized form for use with the functions
 159 dealing with untranslated filesystems."
 160   (if (memq system-type '(ms-dos windows-nt))
 161       ;; The canonical form for DOS/W32 is with A-Z downcased and all
 162       ;; directory separators changed to directory-sep-char.
 163       (let ((name nil))
 164         (setq name (mapconcat
 165                     '(lambda (char)
 166                        (if (and (<= ?A char) (<= char ?Z))
 167                            (char-to-string (+ (- char ?A) ?a))
 168                          (char-to-string char)))
 169                     filename nil))
 170         ;; Use expand-file-name to canonicalize directory separators, except
 171         ;; with bare drive letters (which would have the cwd appended).
 172         (if (string-match "^.:$" name)
 173             name
 174           (expand-file-name name)))
 175     filename))
 176
 177 (defun untranslated-file-p (filename)
 178   "Return t if FILENAME is on a filesystem that does not require
 179 CR/LF translation, and nil otherwise."
 180   (let ((fs (untranslated-canonical-name filename))
 181         (ufs-list untranslated-filesystem-list)
 182         (found nil))
 183     (while (and (not found) ufs-list)
 184       (if (string-match (concat "^" (car ufs-list)) fs)
 185           (setq found t)
 186         (setq ufs-list (cdr ufs-list))))
 187     found))
 188
 189 (defun add-untranslated-filesystem (filesystem)
 190   "Add FILESYSTEM to the list of filesystems that do not require
 191 CR/LF translation.  FILESYSTEM is a string containing the directory
 192 prefix corresponding to the filesystem.  For example, for a Unix
 193 filesystem mounted on drive Z:, FILESYSTEM could be \"Z:\"."
 194   (interactive "fUntranslated file system: ")
 195   (let ((fs (untranslated-canonical-name filesystem)))
 196     (if (member fs untranslated-filesystem-list)
 197         untranslated-filesystem-list
 198       (setq untranslated-filesystem-list
 199             (cons fs untranslated-filesystem-list)))))
 200
 201 (defun remove-untranslated-filesystem (filesystem)
 202   "Remove FILESYSTEM from the list of filesystems that do not require
 203 CR/LF translation.  FILESYSTEM is a string containing the directory
 204 prefix corresponding to the filesystem.  For example, for a Unix
 205 filesystem mounted on drive Z:, FILESYSTEM could be \"Z:\"."
 206   (interactive "fUntranslated file system: ")
 207   (setq untranslated-filesystem-list
 208         (delete (untranslated-canonical-name filesystem)
 209                 untranslated-filesystem-list)))
 210
 211 ;; Process I/O decoding and encoding.
 212
 213 (defun find-binary-process-coding-system (op args)
 214   "Choose a coding system for process I/O.
 215 The coding system for decode is 'no-conversion' if 'binary-process-output'
 216 is non-nil, and 'emacs-mule-dos' otherwise.  Similarly, the coding system
 217 for encode is 'no-conversion' if 'binary-process-input' is non-nil,
 218 and 'emacs-mule-dos' otherwise."
 219   (let ((decode 'emacs-mule-dos)
 220         (encode 'emacs-mule-dos))
 221     (if binary-process-output
 222         (setq decode 'no-conversion))
 223     (if binary-process-input
 224         (setq encode 'no-conversion))
 225     (cons decode encode)))
 226
 227 (modify-coding-system-alist 'process "" 'find-binary-process-coding-system)
 228
 229
 230 (provide 'dos-w32)
 231
 232 ;;; dos-w32.el ends here