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115 lines
4.2 KiB
EmacsLisp
115 lines
4.2 KiB
EmacsLisp
;;; uncompress.el --- auto-decompression hook for visiting .Z files
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;; Copyright (C) 1992, 1994 Free Software Foundation, Inc.
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;; Maintainer: FSF
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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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;; This package can be used to arrange for automatic uncompress of
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;; compressed files when they are visited.
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;; All that's necessary is to load it. This can conveniently be done from
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;; your .emacs file.
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;; M-x auto-compression-mode is a more modern replacement for this package.
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;;; Code:
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;; When we are about to make a backup file,
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;; uncompress the file we visited
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;; so that making the backup can work properly.
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;; This is used as a write-file-hook.
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(defvar uncompress-program "gunzip"
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"Program to use for uncompression.")
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(defun uncompress-backup-file ()
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(and buffer-file-name make-backup-files (not buffer-backed-up)
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(not (file-exists-p buffer-file-name))
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(call-process uncompress-program nil nil nil buffer-file-name))
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nil)
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(or (assoc "\\.Z$" auto-mode-alist)
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(setq auto-mode-alist
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(cons '("\\.Z$" . uncompress-while-visiting) auto-mode-alist)))
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(or (assoc "\\.gz$" auto-mode-alist)
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(setq auto-mode-alist
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(cons '("\\.gz$" . uncompress-while-visiting) auto-mode-alist)))
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(or (assoc "\\.tgz$" auto-mode-alist)
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(setq auto-mode-alist
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(cons '("\\.tgz$" . uncompress-while-visiting) auto-mode-alist)))
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(defun uncompress-while-visiting ()
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"Temporary \"major mode\" used for .Z and .gz files, to uncompress them.
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It then selects a major mode from the uncompressed file name and contents."
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(if (and (not (null buffer-file-name))
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(string-match "\\.Z$" buffer-file-name))
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(set-visited-file-name
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(substring buffer-file-name 0 (match-beginning 0)))
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(if (and (not (null buffer-file-name))
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(string-match "\\.gz$" buffer-file-name))
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(set-visited-file-name
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(substring buffer-file-name 0 (match-beginning 0)))
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(if (and (not (null buffer-file-name))
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(string-match "\\.tgz$" buffer-file-name))
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(set-visited-file-name
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(concat (substring buffer-file-name 0 (match-beginning 0)) ".tar")))))
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(message "Uncompressing...")
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(let ((buffer-read-only nil)
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(coding-system-for-write 'no-conversion)
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(coding-system-for-read
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(car (find-operation-coding-system
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'insert-file-contents
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buffer-file-name t))))
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(shell-command-on-region (point-min) (point-max) uncompress-program t))
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(goto-char (point-min))
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(message "Uncompressing...done")
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(set-buffer-modified-p nil)
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(make-local-variable 'write-file-hooks)
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(or (memq 'uncompress-backup-file write-file-hooks)
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(setq write-file-hooks (cons 'uncompress-backup-file write-file-hooks)))
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(normal-mode))
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(or (memq 'find-compressed-version find-file-not-found-hooks)
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(setq find-file-not-found-hooks
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(cons 'find-compressed-version find-file-not-found-hooks)))
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(defun find-compressed-version ()
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"Hook to read and uncompress the compressed version of a file."
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;; Just pretend we had visited the compressed file,
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;; and uncompress-while-visiting will do the rest.
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(let (name)
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(if (file-exists-p (setq name (concat buffer-file-name ".Z")))
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(setq buffer-file-name name)
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(if (file-exists-p (setq name (concat buffer-file-name ".gz")))
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(setq buffer-file-name name)))
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(if (eq name buffer-file-name)
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(progn
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(insert-file-contents buffer-file-name t)
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(goto-char (point-min))
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;; No need for this, because error won't be set to t
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;; if this function returns t.
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;; (setq error nil)
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t))))
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(provide 'uncompress)
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;;; uncompress.el ends here
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