jbw@bucsb.UUCP (Joe Wells) (12/11/88)
For those of you who enjoyed uncompress.el, here is an enhanced
version of it. It has the following bug fixes incorporated:
1) It will work on read-only files.
2) If you load it more than once, it will not keep adding its hooks to
auto-mode-alist and write-file-hooks. This version will check to see
if the hooks are already in place.
3) In the original uncompress.el, when you edited a compressed file,
it would only uncompress the buffer, not the file on disk. If you
modified and then saved the buffer, it would save the buffer as an
ordinary file and also leave the original compressed file in place.
This version will uncompress the file on disk and make it the backup
file. This makes it easier to later recompress the changed file.
Since my modifications depend on a buffer local variable, I am also
including a fix that prevents kill-all-local-variables from nuking
special variables every time the major mode of the buffer is changed.
I think this behavior of kill-all-local-variables is *most* annoying.
I have found this package to be incredibly helpful, since I keep most
of my files compressed for lack of disk space.
Have fun!
--
Joe Wells INTERNET: jbw%bucsf.bu.edu@bu-it.bu.edu
IP: [128.197.2.9] UUCP: ...!harvard!bu-cs!bucsf!jbw
-------------------------uncompress.fix.el----------------------------
;; Enhanced uncompression handling.
;; Copyright (C) 1988 Free Software Foundation, Inc.
;; This file is not officially part of GNU Emacs, but is being donated
;; to the Free Software Foundation.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY. No author or distributor
;; accepts responsibility to anyone for the consequences of using it
;; or for whether it serves any particular purpose or works at all,
;; unless he says so in writing. Refer to the GNU Emacs General Public
;; License for full details.
;; Everyone is granted permission to copy, modify and redistribute
;; GNU Emacs, but only under the conditions described in the
;; GNU Emacs General Public License. A copy of this license is
;; supposed to have been given to you along with GNU Emacs so you
;; can know your rights and responsibilities. It should be in a
;; file named COPYING. Among other things, the copyright notice
;; and this notice must be preserved on all copies.
;; Author: Joe Wells
;; jbw%bucsf.bu.edu@bu-it.bu.edu (school year)
;; joew%uswest@boulder.colorado.edu (summer)
;; This is based on original uncopyrighted work by an unknown (to me)
;; author. Since it was uncopyrighted, I felt it was ok to place the
;; FSF copyright on the entire file, my work and the original authors
;; work. If that's not ok, the FSF copyright still applies to my
;; portion of the work.
(require 'kill-fix)
(defvar buffer-compressed-file nil
"Is the storage for this buffer on disk actually a compressed file?")
(make-variable-buffer-local 'buffer-compressed-file)
(put 'buffer-compressed-file 'preserved t)
(defun uncompress-backup-file ()
"If the file that we are editing is a compressed file on disk,
uncompress it and make it the backup file."
(or buffer-file-name
(error "Buffer %s has no file-name" (current-buffer)))
(let ((backup-name (car (find-backup-file-name buffer-file-name))))
(cond ((and buffer-compressed-file
make-backup-files ;what should I do here?
(not buffer-backed-up) ;if claim backed-up, skip
(not (file-exists-p buffer-file-name))
(not (file-exists-p backup-name)))
(call-process "uncompress" nil nil nil buffer-file-name)
(cond ((file-exists-p buffer-file-name)
(condition-case ()
(rename-file buffer-file-name backup-name t)
(file-error
;; If trouble writing the backup, write it in ~.
(setq backup-name (expand-file-name "~/%backup%~"))
(message "Cannot write backup file; backing up in %s"
backup-name)
(sleep-for 1)
(copy-file buffer-file-name backup-name 1 t)))
(kill-local-variable 'buffer-compressed-file)
(setq buffer-backed-up t))))))
nil)
(or (memq 'uncompress-backup-file write-file-hooks)
(setq write-file-hooks (cons 'uncompress-backup-file write-file-hooks)))
(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$" buffer-file-name))
(set-visited-file-name
(substring buffer-file-name 0 (match-beginning 0))))
(message "Uncompressing...")
(let ((buffer-read-only nil))
(shell-command-on-region (point-min) (point-max) "uncompress" t))
(message "Uncompressing...done")
(set-buffer-modified-p nil)
(setq buffer-compressed-file t)
(normal-mode))
(or (equal (assoc "\\.Z$" auto-mode-alist)
'("\\.Z$" . uncompress-while-visiting))
(setq auto-mode-alist
(cons '("\\.Z$" . uncompress-while-visiting) auto-mode-alist)))
(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)))
(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)))
(provide 'uncompress)
---------------------------kill-fix.el--------------------------------
;; Enhancement to kill-all-local-variables
;; Copyright (C) 1988 Free Software Foundation, Inc.
;; This file is not officially part of GNU Emacs, but is being donated
;; to the Free Software Foundation.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY. No author or distributor
;; accepts responsibility to anyone for the consequences of using it
;; or for whether it serves any particular purpose or works at all,
;; unless he says so in writing. Refer to the GNU Emacs General Public
;; License for full details.
;; Everyone is granted permission to copy, modify and redistribute
;; GNU Emacs, but only under the conditions described in the
;; GNU Emacs General Public License. A copy of this license is
;; supposed to have been given to you along with GNU Emacs so you
;; can know your rights and responsibilities. It should be in a
;; file named COPYING. Among other things, the copyright notice
;; and this notice must be preserved on all copies.
;; Author: Joe Wells
;; jbw%bucsf.bu.edu@bu-it.bu.edu (school year)
;; joew%uswest@boulder.colorado.edu (summer)
;; save the original subr function definition of kill-all-local-variables
(or (fboundp 'original-kill-all-local-variables)
(fset 'original-kill-all-local-variables
(symbol-function 'kill-all-local-variables)))
(defun kill-all-local-variables ()
"Eliminate all the buffer-local variable values of the current
buffer. This buffer will then see the default values of all
variables. NOTE: This function has been modified to ignore
buffer-local variables whose preserved property is non-nil."
(let ((oldvars (buffer-local-variables)))
(original-kill-all-local-variables)
(while oldvars
(let ((var (car (car oldvars))))
(cond ((get var 'preserved)
(make-local-variable var)
(set var (cdr (car oldvars))))))
(setq oldvars (cdr oldvars)))))
(provide 'kill-fix)