mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-23 07:19:15 +00:00
115 lines
4.2 KiB
EmacsLisp
115 lines
4.2 KiB
EmacsLisp
;;; uncompress.el --- auto-decompression hook for visiting .Z files
|
|
|
|
;; Copyright (C) 1992, 1994 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, Inc., 59 Temple Place - Suite 330,
|
|
;; Boston, MA 02111-1307, USA.
|
|
|
|
;;; Commentary:
|
|
|
|
;; This package can be used to arrange for automatic uncompress of
|
|
;; compressed files when they are visited.
|
|
;; All that's necessary is to load it. This can conveniently be done from
|
|
;; your .emacs file.
|
|
|
|
;; M-x auto-compression-mode is a more modern replacement for this package.
|
|
|
|
;;; 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.
|
|
|
|
(defvar uncompress-program "gunzip"
|
|
"Program to use for uncompression.")
|
|
|
|
(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-program 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)))
|
|
(or (assoc "\\.gz$" auto-mode-alist)
|
|
(setq auto-mode-alist
|
|
(cons '("\\.gz$" . uncompress-while-visiting) auto-mode-alist)))
|
|
(or (assoc "\\.tgz$" auto-mode-alist)
|
|
(setq auto-mode-alist
|
|
(cons '("\\.tgz$" . uncompress-while-visiting) auto-mode-alist)))
|
|
|
|
(defun uncompress-while-visiting ()
|
|
"Temporary \"major mode\" used for .Z and .gz files, to uncompress them.
|
|
It then selects a major mode from the uncompressed file name and contents."
|
|
(if (and (not (null buffer-file-name))
|
|
(string-match "\\.Z$" buffer-file-name))
|
|
(set-visited-file-name
|
|
(substring buffer-file-name 0 (match-beginning 0)))
|
|
(if (and (not (null buffer-file-name))
|
|
(string-match "\\.gz$" buffer-file-name))
|
|
(set-visited-file-name
|
|
(substring buffer-file-name 0 (match-beginning 0)))
|
|
(if (and (not (null buffer-file-name))
|
|
(string-match "\\.tgz$" buffer-file-name))
|
|
(set-visited-file-name
|
|
(concat (substring buffer-file-name 0 (match-beginning 0)) ".tar")))))
|
|
(message "Uncompressing...")
|
|
(let ((buffer-read-only nil)
|
|
(coding-system-for-write 'no-conversion)
|
|
(coding-system-for-read
|
|
(car (find-operation-coding-system
|
|
'insert-file-contents
|
|
buffer-file-name t))))
|
|
(shell-command-on-region (point-min) (point-max) uncompress-program t))
|
|
(goto-char (point-min))
|
|
(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.
|
|
(let (name)
|
|
(if (file-exists-p (setq name (concat buffer-file-name ".Z")))
|
|
(setq buffer-file-name name)
|
|
(if (file-exists-p (setq name (concat buffer-file-name ".gz")))
|
|
(setq buffer-file-name name)))
|
|
(if (eq name buffer-file-name)
|
|
(progn
|
|
(insert-file-contents buffer-file-name t)
|
|
(goto-char (point-min))
|
|
;; No need for this, because error won't be set to t
|
|
;; if this function returns t.
|
|
;; (setq error nil)
|
|
t))))
|
|
|
|
(provide 'uncompress)
|
|
|
|
;;; uncompress.el ends here
|