;;; dos-w32.el --- Functions shared among MS-DOS and W32 (NT/95) platforms ;; Copyright (C) 1996 Free Software Foundation, Inc. ;; Maintainer: Geoff Voelker ;; Keywords: internal ;; This file is part of GNU Emacs. ;; GNU Emacs is free software; you can redistribute it and/or modify ;; it under the terms of the GNU General Public License as published by ;; the Free Software Foundation; either version 2, or (at your option) ;; any later version. ;; GNU Emacs is distributed in the hope that it will be useful, ;; but WITHOUT ANY WARRANTY; without even the implied warranty of ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;; GNU General Public License for more details. ;; You should have received a copy of the GNU General Public License ;; along with GNU Emacs; see the file COPYING. If not, write to the ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, ;; Boston, MA 02111-1307, USA. ;;; Commentary: ;; Parts of this code are duplicated functions taken from dos-fns.el ;; and winnt.el. ;;; Code: ;; Use ";" instead of ":" as a path separator (from files.el). (setq path-separator ";") (setq minibuffer-history-case-insensitive-variables (cons 'file-name-history minibuffer-history-case-insensitive-variables)) ;; Set the null device (for compile.el). (setq grep-null-device "NUL") ;; Set the grep regexp to match entries with drive letters. (setq grep-regexp-alist '(("^\\(\\([a-zA-Z]:\\)?[^:( \t\n]+\\)[:( \t]+\\([0-9]+\\)[:) \t]" 1 3))) ;; For distinguishing file types based upon suffixes. (defvar file-name-buffer-file-type-alist '( ("[:/].*config.sys$" . nil) ; config.sys text ("\\.elc$" . t) ; emacs stuff ("\\.\\(obj\\|exe\\|com\\|lib\\|sym\\|sys\\|chk\\|out\\|bin\\|ico\\|pif\\|class\\)$" . t) ; MS-Dos stuff ("\\.\\(dll\\|drv\\|cpl\\|scr\\vbx\\|386\\|vxd\\|fon\\|fnt\\|fot\\|ttf\\|grp\\)$" . t) ; Windows stuff ("\\.\\(hlp\\|bmp\\|wav\\|avi\\|mpg\\|jpg\\|tif\\mov\\au\\)" . t) ; known binary data files ("\\.\\(arc\\|zip\\|pak\\|lzh\\|zoo\\)$" . t) ; Packers ("\\.\\(a\\|o\\|tar\\|z\\|gz\\|taz\\|jar\\)$" . t) ; Unix stuff ("\\.tp[ulpw]$" . t) ; Borland Pascal stuff ("[:/]tags$" . t) ; Emacs TAGS file ) "*Alist for distinguishing text files from binary files. Each element has the form (REGEXP . TYPE), where REGEXP is matched against the file name, and TYPE is nil for text, t for binary.") ;; Return the pair matching filename on file-name-buffer-file-type-alist, ;; or nil otherwise. (defun find-buffer-file-type-match (filename) (let ((alist file-name-buffer-file-type-alist) (found nil)) (let ((case-fold-search t)) (setq filename (file-name-sans-versions filename)) (while (and (not found) alist) (if (string-match (car (car alist)) filename) (setq found (car alist))) (setq alist (cdr alist))) found))) ;; Don't check for untranslated file systems here. (defun find-buffer-file-type (filename) (let ((match (find-buffer-file-type-match filename)) (code)) (if (not match) default-buffer-file-type (setq code (cdr match)) (cond ((memq code '(nil t)) code) ((and (symbolp code) (fboundp code)) (funcall code filename)))))) (setq-default buffer-file-coding-system 'undecided-dos) (defun find-buffer-file-type-coding-system (command) "Choose a coding system for a file operation. If COMMAND is `insert-file-contents', the coding system is chosen based upon the filename, the contents of `untranslated-filesystem-list' and `file-name-buffer-file-type-alist', and whether the file exists: If it matches in `untranslated-filesystem-list': If the file exists: `no-conversion' If the file does not exist: `undecided' If it matches in `file-name-buffer-file-type-alist': If the match is t (for binary): `no-conversion' If the match is nil (for dos-text): `undecided-dos' Otherwise: If the file exists: `undecided' If the file does not exist: `undecided-dos' If COMMAND is `write-region', the coding system is chosen based upon the value of `buffer-file-coding-system' and `buffer-file-type'. If `buffer-file-coding-system' is non-nil, its value is used. If it is nil and `buffer-file-type' is t, the coding system is `no-conversion'. Otherwise, it is `undecided-dos'. The two most common situations are when DOS and Unix files are read and written, and their names do not match in `untranslated-filesystem-list' and `file-name-buffer-file-type-alist'. In these cases, the coding system initially will be `undecided'. As the file is read in the DOS case, the coding system will be changed to `undecided-dos' as CR/LFs are detected. As the file is read in the Unix case, the coding system will be changed to `undecided-unix' as LFs are detected. In both cases, `buffer-file-coding-system' will be set to the appropriate coding system, and the value of `buffer-file-coding-system' will be used when writing the file." (let ((op (nth 0 command)) (target) (binary nil) (text nil) (undecided nil) (undecided-unix nil)) (cond ((eq op 'insert-file-contents) (setq target (nth 1 command)) ;; First check for a file name that indicates ;; it is truly binary. (setq binary (find-buffer-file-type target)) (cond (binary) ;; Next check for files that MUST use DOS eol conversion. ((find-buffer-file-type-match target) (setq text t)) ;; For any other existing file, decide based on contents. ((file-exists-p target) (setq undecided t)) ;; Next check for a non-DOS file system. ((untranslated-file-p target) (setq undecided-unix t))) (cond (binary '(no-conversion . no-conversion)) (text '(undecided-dos . undecided-dos)) (undecided-unix '(undecided-unix . undecided-unix)) (undecided '(undecided . undecided)) (t '(undecided-dos . undecided-dos)))) ((eq op 'write-region) (if buffer-file-coding-system (cons buffer-file-coding-system buffer-file-coding-system) ;; Normally this is used only in a non-file-visiting ;; buffer, because normally buffer-file-coding-system is non-nil ;; in a file-visiting buffer. (if buffer-file-type '(no-conversion . no-conversion) '(undecided-dos . undecided-dos))))))) (modify-coding-system-alist 'file "" 'find-buffer-file-type-coding-system) (defun find-file-binary (filename) "Visit file FILENAME and treat it as binary." (interactive "FFind file binary: ") (let ((file-name-buffer-file-type-alist '(("" . t)))) (find-file filename))) (defun find-file-text (filename) "Visit file FILENAME and treat it as a text file." (interactive "FFind file text: ") (let ((file-name-buffer-file-type-alist '(("" . nil)))) (find-file filename))) (defun find-file-not-found-set-buffer-file-coding-system () (save-excursion (set-buffer (current-buffer)) (let* ((dummy-insert-op (list 'insert-file-contents (buffer-file-name))) (coding-system-pair (find-buffer-file-type-coding-system dummy-insert-op))) (setq buffer-file-coding-system (car coding-system-pair)) (setq buffer-file-type (eq buffer-file-coding-system 'no-conversion))))) ;;; To set the default coding system on new files. (add-hook 'find-file-not-found-hooks 'find-file-not-found-set-buffer-file-coding-system) ;;; To accomodate filesystems that do not require CR/LF translation. (defvar untranslated-filesystem-list nil "List of filesystems that require no CR/LF translation when reading and writing files. Each filesystem in the list is a string naming the directory prefix corresponding to the filesystem.") (defun untranslated-canonical-name (filename) "Return FILENAME in a canonicalized form for use with the functions dealing with untranslated filesystems." (if (memq system-type '(ms-dos windows-nt)) ;; The canonical form for DOS/W32 is with A-Z downcased and all ;; directory separators changed to directory-sep-char. (let ((name nil)) (setq name (mapconcat '(lambda (char) (if (and (<= ?A char) (<= char ?Z)) (char-to-string (+ (- char ?A) ?a)) (char-to-string char))) filename nil)) ;; Use expand-file-name to canonicalize directory separators, except ;; with bare drive letters (which would have the cwd appended). (if (string-match "^.:$" name) name (expand-file-name name))) filename)) (defun untranslated-file-p (filename) "Return t if FILENAME is on a filesystem that does not require CR/LF translation, and nil otherwise." (let ((fs (untranslated-canonical-name filename)) (ufs-list untranslated-filesystem-list) (found nil)) (while (and (not found) ufs-list) (if (string-match (concat "^" (car ufs-list)) fs) (setq found t) (setq ufs-list (cdr ufs-list)))) found)) (defun add-untranslated-filesystem (filesystem) "Add FILESYSTEM to the list of filesystems that do not require CR/LF translation. FILESYSTEM is a string containing the directory prefix corresponding to the filesystem. For example, for a Unix filesystem mounted on drive Z:, FILESYSTEM could be \"Z:\"." (interactive "fUntranslated file system: ") (let ((fs (untranslated-canonical-name filesystem))) (if (member fs untranslated-filesystem-list) untranslated-filesystem-list (setq untranslated-filesystem-list (cons fs untranslated-filesystem-list))))) (defun remove-untranslated-filesystem (filesystem) "Remove FILESYSTEM from the list of filesystems that do not require CR/LF translation. FILESYSTEM is a string containing the directory prefix corresponding to the filesystem. For example, for a Unix filesystem mounted on drive Z:, FILESYSTEM could be \"Z:\"." (interactive "fUntranslated file system: ") (setq untranslated-filesystem-list (delete (untranslated-canonical-name filesystem) untranslated-filesystem-list))) (setq-default default-process-coding-system (if (fboundp 'start-process) '(raw-text-dos . raw-text-dos) '(undecided-dos . undecided-dos))) (provide 'dos-w32) ;;; dos-w32.el ends here