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;;; dos-w32.el --- Functions shared among MS-DOS and W32 (NT/95) platforms
;; Copyright (C) 1996 Free Software Foundation, Inc.
;; Maintainer: Geoff Voelker (voelker@cs.washington.edu)
;; 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 ";")
;; 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\\|dos\\|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)))
;; Process I/O decoding and encoding.
(defun find-binary-process-coding-system (command)
"Choose a coding system for process I/O.
The coding system for decode is 'no-conversion' if 'binary-process-output'
is non-nil, and 'undecided-dos' otherwise. Similarly, the coding system
for encode is 'no-conversion' if 'binary-process-input' is non-nil,
and 'undecided-dos' otherwise."
(let ((decode 'undecided-dos)
(encode 'undecided-dos))
(if binary-process-output
(setq decode 'no-conversion))
(if binary-process-input
(setq encode 'no-conversion))
(cons decode encode)))
(modify-coding-system-alist 'process "" 'find-binary-process-coding-system)
(provide 'dos-w32)
;;; dos-w32.el ends here
|
