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dfbcdf5f5b
Use emacs-mule-dos for text file names; use undecided-dos for the last resort (instead of emacs-mule-dos).
234 lines
8.4 KiB
EmacsLisp
234 lines
8.4 KiB
EmacsLisp
;;; dos-w32.el --- Functions shared among MS-DOS and W32 (NT/95) platforms
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;; Copyright (C) 1996 Free Software Foundation, Inc.
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;; Maintainer: Geoff Voelker (voelker@cs.washington.edu)
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;; Keywords: internal
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; Parts of this code are duplicated functions taken from dos-fns.el
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;; and winnt.el.
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;;; Code:
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;;; Add %t: into the mode line format just after the open-paren.
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(let ((tail (member " %[(" mode-line-format)))
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(setcdr tail (cons (purecopy "%t:")
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(cdr tail))))
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;; Use ";" instead of ":" as a path separator (from files.el).
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(setq path-separator ";")
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;; Set the null device (for compile.el).
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(setq grep-null-device "NUL")
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;; Set the grep regexp to match entries with drive letters.
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(setq grep-regexp-alist
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'(("^\\(\\([a-zA-Z]:\\)?[^:( \t\n]+\\)[:( \t]+\\([0-9]+\\)[:) \t]" 1 3)))
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;; For distinguishing file types based upon suffixes.
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(defvar file-name-buffer-file-type-alist
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'(
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("[:/].*config.sys$" . nil) ; config.sys text
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("\\.elc$" . t) ; emacs stuff
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("\\.\\(obj\\|exe\\|com\\|lib\\|sys\\|chk\\|out\\|bin\\|ico\\|pif\\)$" . t)
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; MS-Dos stuff
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("\\.\\(arc\\|zip\\|pak\\|lzh\\|zoo\\)$" . t)
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; Packers
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("\\.\\(a\\|o\\|tar\\|z\\|gz\\|taz\\)$" . t)
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; Unix stuff
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("\\.tp[ulpw]$" . t)
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; Borland Pascal stuff
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("[:/]tags$" . t)
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; Emacs TAGS file
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)
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"*Alist for distinguishing text files from binary files.
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Each element has the form (REGEXP . TYPE), where REGEXP is matched
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against the file name, and TYPE is nil for text, t for binary.")
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;; Return the pair matching filename on file-name-buffer-file-type-alist,
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;; or nil otherwise.
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(defun find-buffer-file-type-match (filename)
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(let ((alist file-name-buffer-file-type-alist)
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(found nil))
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(let ((case-fold-search t))
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(setq filename (file-name-sans-versions filename))
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(while (and (not found) alist)
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(if (string-match (car (car alist)) filename)
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(setq found (car alist)))
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(setq alist (cdr alist)))
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found)))
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(defun find-buffer-file-type (filename)
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;; First check if file is on an untranslated filesystem, then on the alist.
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(if (untranslated-file-p filename)
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t ; for binary
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(let ((match (find-buffer-file-type-match filename))
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(code))
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(if (not match)
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default-buffer-file-type
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(setq code (cdr match))
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(cond ((memq code '(nil t)) code)
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((and (symbolp code) (fboundp code))
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(funcall code filename)))))))
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(defun find-buffer-file-type-coding-system (command args)
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"Choose a coding system for a file operation.
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If COMMAND is 'insert-file-contents', the coding system is chosen based
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upon the filename, the contents of 'untranslated-filesystem-list' and
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'file-name-buffer-file-type-alist', and whether the file exists:
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If it matches in 'untranslated-filesystem-list': 'no-conversion'
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If it matches in 'file-name-buffer-file-type-alist':
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If the match is t (for binary): 'no-conversion'
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If the match is nil (for text): 'emacs-mule-dos'
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Otherwise:
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If the file exists: 'undecided'
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If the file does not exist: 'undecided-dos'
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If COMMAND is 'write-region', the coding system is chosen based
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upon the value of 'buffer-file-type': If t, the coding system is
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'no-conversion', otherwise it is 'emacs-mule-dos'."
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(let ((op (nth 0 command))
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(target)
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(binary nil) (text nil)
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(undecided nil))
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(cond ((eq op 'insert-file-contents)
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(setq target (nth 1 command))
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(setq binary (find-buffer-file-type target))
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(unless binary
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(if (find-buffer-file-type-match target)
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(setq text t)
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(setq undecided (file-exists-p target)))))
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((eq op 'write-region)
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(setq binary buffer-file-type)))
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(cond (binary '(no-conversion . no-conversion))
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(text '(emacs-mule-dos . emacs-mule-dos))
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(undecided '(undecided . undecided))
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(t '(undecided-dos . undecided-dos)))))
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(modify-coding-system-alist 'file "" 'find-buffer-file-type-coding-system)
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(defun find-file-binary (filename)
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"Visit file FILENAME and treat it as binary."
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(interactive "FFind file binary: ")
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(let ((file-name-buffer-file-type-alist '(("" . t))))
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(find-file filename)))
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(defun find-file-text (filename)
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"Visit file FILENAME and treat it as a text file."
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(interactive "FFind file text: ")
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(let ((file-name-buffer-file-type-alist '(("" . nil))))
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(find-file filename)))
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(defun find-file-not-found-set-buffer-file-type ()
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(save-excursion
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(set-buffer (current-buffer))
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(setq buffer-file-type (find-buffer-file-type (buffer-file-name))))
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nil)
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;;; To set the default file type on new files.
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(add-hook 'find-file-not-found-hooks 'find-file-not-found-set-buffer-file-type)
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;;; To accomodate filesystems that do not require CR/LF translation.
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(defvar untranslated-filesystem-list nil
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"List of filesystems that require no CR/LF translation when reading
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and writing files. Each filesystem in the list is a string naming
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the directory prefix corresponding to the filesystem.")
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(defun untranslated-canonical-name (filename)
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"Return FILENAME in a canonicalized form for use with the functions
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dealing with untranslated filesystems."
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(if (memq system-type '(ms-dos windows-nt))
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;; The canonical form for DOS/W32 is with A-Z downcased and all
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;; directory separators changed to directory-sep-char.
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(let ((name nil))
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(setq name (mapconcat
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'(lambda (char)
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(if (and (<= ?A char) (<= char ?Z))
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(char-to-string (+ (- char ?A) ?a))
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(char-to-string char)))
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filename nil))
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;; Use expand-file-name to canonicalize directory separators, except
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;; with bare drive letters (which would have the cwd appended).
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(if (string-match "^.:$" name)
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name
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(expand-file-name name)))
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filename))
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(defun untranslated-file-p (filename)
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"Return t if FILENAME is on a filesystem that does not require
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CR/LF translation, and nil otherwise."
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(let ((fs (untranslated-canonical-name filename))
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(ufs-list untranslated-filesystem-list)
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(found nil))
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(while (and (not found) ufs-list)
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(if (string-match (concat "^" (car ufs-list)) fs)
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(setq found t)
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(setq ufs-list (cdr ufs-list))))
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found))
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(defun add-untranslated-filesystem (filesystem)
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"Add FILESYSTEM to the list of filesystems that do not require
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CR/LF translation. FILESYSTEM is a string containing the directory
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prefix corresponding to the filesystem. For example, for a Unix
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filesystem mounted on drive Z:, FILESYSTEM could be \"Z:\"."
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(interactive "fUntranslated file system: ")
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(let ((fs (untranslated-canonical-name filesystem)))
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(if (member fs untranslated-filesystem-list)
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untranslated-filesystem-list
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(setq untranslated-filesystem-list
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(cons fs untranslated-filesystem-list)))))
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(defun remove-untranslated-filesystem (filesystem)
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"Remove FILESYSTEM from the list of filesystems that do not require
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CR/LF translation. FILESYSTEM is a string containing the directory
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prefix corresponding to the filesystem. For example, for a Unix
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filesystem mounted on drive Z:, FILESYSTEM could be \"Z:\"."
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(interactive "fUntranslated file system: ")
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(setq untranslated-filesystem-list
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(delete (untranslated-canonical-name filesystem)
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untranslated-filesystem-list)))
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;; Process I/O decoding and encoding.
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(defun find-binary-process-coding-system (op args)
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"Choose a coding system for process I/O.
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The coding system for decode is 'no-conversion' if 'binary-process-output'
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is non-nil, and 'emacs-mule-dos' otherwise. Similarly, the coding system
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for encode is 'no-conversion' if 'binary-process-input' is non-nil,
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and 'emacs-mule-dos' otherwise."
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(let ((decode 'emacs-mule-dos)
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(encode 'emacs-mule-dos))
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(if binary-process-output
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(setq decode 'no-conversion))
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(if binary-process-input
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(setq encode 'no-conversion))
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(cons decode encode)))
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(modify-coding-system-alist 'process "" 'find-binary-process-coding-system)
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(provide 'dos-w32)
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;;; dos-w32.el ends here
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