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[emacs.git] / lisp / dos-win32.el
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1 ;;; dos-win32.el --- Functions shared among MS-DOS and Win32 (NT/95) platforms
3 ;; Copyright (C) 1996 Free Software Foundation, Inc.
5 ;; Maintainer: Geoff Voelker (voelker@cs.washington.edu)
6 ;; Keywords: internal
8 ;; This file is part of GNU Emacs.
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.
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.
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.
25 ;;; Commentary:
27 ;; Parts of this code are duplicated functions taken from dos-fns.el
28 ;; and winnt.el.
30 ;;; Code:
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))))
37 ;; Use ";" instead of ":" as a path separator (from files.el).
38 (setq path-separator ";")
40 ;; Set the null device (for compile.el).
41 (setq grep-null-device "NUL")
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)))
47 ;; For distinguishing file types based upon suffixes.
48 (defvar file-name-buffer-file-type-alist
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
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.")
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))))
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)))
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)))
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)
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)
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 during file I/O.
112 Each element in the list is a string naming the directory prefix
113 corresponding to the filesystem.")
115 (defun untranslated-canonical-name (filename)
116 "Return FILENAME in a canonicalized form.
117 This is for use with the functions dealing with untranslated filesystems."
118 (if (memq system-type '(ms-dos windows-nt))
119 ;; The canonical form for DOS/NT/Win95 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))
135 (defun untranslated-file-p (filename)
136 "Test whether CR/LF translation should be disabled for FILENAME.
137 Return t if FILENAME is on a filesystem that does not require
138 CR/LF translation, and nil otherwise."
139 (let ((fs (untranslated-canonical-name filename))
140 (ufs-list untranslated-filesystem-list)
141 (found nil))
142 (while (and (not found) ufs-list)
143 (if (string-match (concat "^" (regexp-quote (car ufs-list))) fs)
144 (setq found t)
145 (setq ufs-list (cdr ufs-list))))
146 found))
148 (defun add-untranslated-filesystem (filesystem)
149 "Record that FILESYSTEM does not require CR/LF translation.
150 FILESYSTEM is a string containing the directory prefix corresponding to
151 the filesystem. For example, for a Unix filesystem mounted on drive Z:,
152 FILESYSTEM could be \"Z:\"."
153 (let ((fs (untranslated-canonical-name filesystem)))
154 (if (member fs untranslated-filesystem-list)
155 untranslated-filesystem-list
156 (setq untranslated-filesystem-list
157 (cons fs untranslated-filesystem-list)))))
159 (defun remove-untranslated-filesystem (filesystem)
160 "Record that FILESYSTEM requires CR/LF translation.
161 FILESYSTEM is a string containing the directory prefix corresponding to
162 the filesystem. For example, for a Unix filesystem mounted on drive Z:,
163 FILESYSTEM could be \"Z:\"."
164 (setq untranslated-filesystem-list
165 (delete (untranslated-canonical-name filesystem)
166 untranslated-filesystem-list)))
168 (provide 'dos-win32)
170 ;;; dos-win32.el ends here