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 (defun find-buffer-file-type (filename)
  68   ;; First check if file is on an untranslated filesystem, then on the alist.
  69   (if (untranslated-file-p filename)
  70       t ; for binary
  71     (let ((alist file-name-buffer-file-type-alist)
  72           (found nil)
  73           (code nil))
  74       (let ((case-fold-search t))
  75         (setq filename (file-name-sans-versions filename))
  76         (while (and (not found) alist)
  77           (if (string-match (car (car alist)) filename)
  78               (setq code (cdr (car alist))
  79                     found t))
  80           (setq alist (cdr alist))))
  81       (if found
  82           (cond ((memq code '(nil t)) code)
  83                 ((and (symbolp code) (fboundp code))
  84                  (funcall code filename)))
  85         default-buffer-file-type))))
  86
  87 (defun find-file-binary (filename)
  88   "Visit file FILENAME and treat it as binary."
  89   (interactive "FFind file binary: ")
  90   (let ((file-name-buffer-file-type-alist '(("" . t))))
  91     (find-file filename)))
  92
  93 (defun find-file-text (filename)
  94   "Visit file FILENAME and treat it as a text file."
  95   (interactive "FFind file text: ")
  96   (let ((file-name-buffer-file-type-alist '(("" . nil))))
  97     (find-file filename)))
  98
  99 (defun find-file-not-found-set-buffer-file-type ()
 100   (save-excursion
 101     (set-buffer (current-buffer))
 102     (setq buffer-file-type (find-buffer-file-type (buffer-file-name))))
 103   nil)
 104
 105 ;;; To set the default file type on new files.
 106 (add-hook 'find-file-not-found-hooks 'find-file-not-found-set-buffer-file-type)
 107
 108
 109 ;;; To accomodate filesystems that do not require CR/LF translation.
 110 (defvar untranslated-filesystem-list nil
 111   "List of filesystems that require no CR/LF translation when reading
 112 and writing files.  Each filesystem in the list is a string naming
 113 the directory prefix corresponding to the filesystem.")
 114
 115 (defun untranslated-canonical-name (filename)
 116   "Return FILENAME in a canonicalized form for use with the functions
 117 dealing with untranslated filesystems."
 118   (if (memq system-type '(ms-dos windows-nt))
 119       ;; The canonical form for DOS/W32 is with A-Z downcased and all
 120       ;; directory separators changed to directory-sep-char.
 121       (let ((name nil))
 122         (setq name (mapconcat
 123                     '(lambda (char)
 124                        (if (and (<= ?A char) (<= char ?Z))
 125                            (char-to-string (+ (- char ?A) ?a))
 126                          (char-to-string char)))
 127                     filename nil))
 128         ;; Use expand-file-name to canonicalize directory separators, except
 129         ;; with bare drive letters (which would have the cwd appended).
 130         (if (string-match "^.:$" name)
 131             name
 132           (expand-file-name name)))
 133     filename))
 134
 135 (defun untranslated-file-p (filename)
 136   "Return t if FILENAME is on a filesystem that does not require
 137 CR/LF translation, and nil otherwise."
 138   (let ((fs (untranslated-canonical-name filename))
 139         (ufs-list untranslated-filesystem-list)
 140         (found nil))
 141     (while (and (not found) ufs-list)
 142       (if (string-match (concat "^" (car ufs-list)) fs)
 143           (setq found t)
 144         (setq ufs-list (cdr ufs-list))))
 145     found))
 146
 147 (defun add-untranslated-filesystem (filesystem)
 148   "Add FILESYSTEM to the list of filesystems that do not require
 149 CR/LF translation.  FILESYSTEM is a string containing the directory
 150 prefix corresponding to the filesystem.  For example, for a Unix
 151 filesystem mounted on drive Z:, FILESYSTEM could be \"Z:\"."
 152   (let ((fs (untranslated-canonical-name filesystem)))
 153     (if (member fs untranslated-filesystem-list)
 154         untranslated-filesystem-list
 155       (setq untranslated-filesystem-list
 156             (cons fs untranslated-filesystem-list)))))
 157
 158 (defun remove-untranslated-filesystem (filesystem)
 159   "Remove FILESYSTEM from the list of filesystems that do not require
 160 CR/LF translation.  FILESYSTEM is a string containing the directory
 161 prefix corresponding to the filesystem.  For example, for a Unix
 162 filesystem mounted on drive Z:, FILESYSTEM could be \"Z:\"."
 163   (setq untranslated-filesystem-list
 164         (delete (untranslated-canonical-name filesystem)
 165                 untranslated-filesystem-list)))
 166
 167 (provide 'dos-w32)
 168
 169 ;;; dos-w32.el ends here