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;;; uncompress.el --- auto-decompression hook for visiting .Z files
;; Copyright (C) 1992 Free Software Foundation, Inc.
;; Maintainer: FSF
;; 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, 675 Mass Ave, Cambridge, MA 02139, USA.
;;; Commentary:
;; This package can be used to arrange for automatic uncompress of
;; files packed with the UNIX compress(1) utility when they are visited.
;; All that's necessary is to load it. This can conveniently be done from
;; your .emacs file.
;;; Code:
;; When we are about to make a backup file,
;; uncompress the file we visited
;; so that making the backup can work properly.
;; This is used as a write-file-hook.
(defun uncompress-backup-file ()
(and buffer-file-name make-backup-files (not buffer-backed-up)
(not (file-exists-p buffer-file-name))
(call-process "uncompress" nil nil nil buffer-file-name))
nil)
(or (assoc "\\.Z$" auto-mode-alist)
(setq auto-mode-alist
(cons '("\\.Z$" . uncompress-while-visiting) auto-mode-alist)))
(defun uncompress-while-visiting ()
"Temporary \"major mode\" used for .Z files, to uncompress the contents.
It then selects a major mode from the uncompressed file name and contents."
(if (and (not (null buffer-file-name))
(string-match "\\.Z$" buffer-file-name))
(set-visited-file-name
(substring buffer-file-name 0 (match-beginning 0))))
(message "Uncompressing...")
(let ((buffer-read-only nil))
(shell-command-on-region (point-min) (point-max) "uncompress" t))
(message "Uncompressing...done")
(set-buffer-modified-p nil)
(make-local-variable 'write-file-hooks)
(or (memq 'uncompress-backup-file write-file-hooks)
(setq write-file-hooks (cons 'uncompress-backup-file write-file-hooks)))
(normal-mode))
(or (memq 'find-compressed-version find-file-not-found-hooks)
(setq find-file-not-found-hooks
(cons 'find-compressed-version find-file-not-found-hooks)))
(defun find-compressed-version ()
"Hook to read and uncompress the compressed version of a file."
;; Just pretend we had visited the compressed file,
;; and uncompress-while-visiting will do the rest.
(if (file-exists-p (concat buffer-file-name ".Z"))
(progn
(setq buffer-file-name (concat buffer-file-name ".Z"))
(insert-file-contents buffer-file-name t)
(goto-char (point-min))
(setq error nil)
t)))
(provide 'uncompress)
;;; uncompress.el ends here
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