mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-24 10:38:38 +00:00
294 lines
11 KiB
EmacsLisp
294 lines
11 KiB
EmacsLisp
;;; jka-cmpr-hook.el --- preloaded code to enable jka-compr.el
|
||
|
||
;; Copyright (C) 1993, 1994, 1995, 1997, 1999, 2000, 2003, 2004, 2005 Free Software Foundation, Inc.
|
||
|
||
;; Author: jka@ece.cmu.edu (Jay K. Adams)
|
||
;; Maintainer: FSF
|
||
;; Keywords: data
|
||
|
||
;; 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 file contains the code to enable and disable Auto-Compression mode.
|
||
;; It is preloaded. The guts of this mode are in jka-compr.el, which
|
||
;; is loaded only when you really try to uncompress something.
|
||
|
||
;;; Code:
|
||
|
||
(defgroup compression nil
|
||
"Data compression utilities"
|
||
:group 'data)
|
||
|
||
(defgroup jka-compr nil
|
||
"jka-compr customization"
|
||
:group 'compression)
|
||
|
||
;;; I have this defined so that .Z files are assumed to be in unix
|
||
;;; compress format; and .gz files, in gzip format, and .bz2 files in bzip fmt.
|
||
(defcustom jka-compr-compression-info-list
|
||
;;[regexp
|
||
;; compr-message compr-prog compr-args
|
||
;; uncomp-message uncomp-prog uncomp-args
|
||
;; can-append auto-mode-flag strip-extension-flag file-magic-bytes]
|
||
'(["\\.Z\\(~\\|\\.~[0-9]+~\\)?\\'"
|
||
"compressing" "compress" ("-c")
|
||
"uncompressing" "uncompress" ("-c")
|
||
nil t "\037\235"]
|
||
;; Formerly, these had an additional arg "-c", but that fails with
|
||
;; "Version 0.1pl2, 29-Aug-97." (RedHat 5.1 GNU/Linux) and
|
||
;; "Version 0.9.0b, 9-Sept-98".
|
||
["\\.bz2\\'"
|
||
"bzip2ing" "bzip2" nil
|
||
"bunzip2ing" "bzip2" ("-d")
|
||
nil t "BZh"]
|
||
["\\.tbz\\'"
|
||
"bzip2ing" "bzip2" nil
|
||
"bunzip2ing" "bzip2" ("-d")
|
||
nil nil "BZh"]
|
||
["\\.tgz\\'"
|
||
"compressing" "gzip" ("-c" "-q")
|
||
"uncompressing" "gzip" ("-c" "-q" "-d")
|
||
t nil "\037\213"]
|
||
["\\.g?z\\(~\\|\\.~[0-9]+~\\)?\\'"
|
||
"compressing" "gzip" ("-c" "-q")
|
||
"uncompressing" "gzip" ("-c" "-q" "-d")
|
||
t t "\037\213"]
|
||
;; dzip is gzip with random access. Its compression program can't
|
||
;; read/write stdin/out, so .dz files can only be viewed without
|
||
;; saving, having their contents decompressed with gzip.
|
||
["\\.dz\\'"
|
||
nil nil nil
|
||
"uncompressing" "gzip" ("-c" "-q" "-d")
|
||
nil t "\037\213"])
|
||
|
||
"List of vectors that describe available compression techniques.
|
||
Each element, which describes a compression technique, is a vector of
|
||
the form [REGEXP COMPRESS-MSG COMPRESS-PROGRAM COMPRESS-ARGS
|
||
UNCOMPRESS-MSG UNCOMPRESS-PROGRAM UNCOMPRESS-ARGS
|
||
APPEND-FLAG STRIP-EXTENSION-FLAG FILE-MAGIC-CHARS], where:
|
||
|
||
regexp is a regexp that matches filenames that are
|
||
compressed with this format
|
||
|
||
compress-msg is the message to issue to the user when doing this
|
||
type of compression (nil means no message)
|
||
|
||
compress-program is a program that performs this compression
|
||
(nil means visit file in read-only mode)
|
||
|
||
compress-args is a list of args to pass to the compress program
|
||
|
||
uncompress-msg is the message to issue to the user when doing this
|
||
type of uncompression (nil means no message)
|
||
|
||
uncompress-program is a program that performs this compression
|
||
|
||
uncompress-args is a list of args to pass to the uncompress program
|
||
|
||
append-flag is non-nil if this compression technique can be
|
||
appended
|
||
|
||
strip-extension-flag non-nil means strip the regexp from file names
|
||
before attempting to set the mode.
|
||
|
||
file-magic-chars is a string of characters that you would find
|
||
at the beginning of a file compressed in this way.
|
||
|
||
Because of the way `call-process' is defined, discarding the stderr output of
|
||
a program adds the overhead of starting a shell each time the program is
|
||
invoked."
|
||
:type '(repeat (vector regexp
|
||
(choice :tag "Compress Message"
|
||
(string :format "%v")
|
||
(const :tag "No Message" nil))
|
||
(choice :tag "Compress Program"
|
||
(string)
|
||
(const :tag "None" nil))
|
||
(repeat :tag "Compress Arguments" string)
|
||
(choice :tag "Uncompress Message"
|
||
(string :format "%v")
|
||
(const :tag "No Message" nil))
|
||
(choice :tag "Uncompress Program"
|
||
(string)
|
||
(const :tag "None" nil))
|
||
(repeat :tag "Uncompress Arguments" string)
|
||
(boolean :tag "Append")
|
||
(boolean :tag "Strip Extension")
|
||
(string :tag "Magic Bytes")))
|
||
:group 'jka-compr)
|
||
|
||
(defcustom jka-compr-mode-alist-additions
|
||
(list (cons "\\.tgz\\'" 'tar-mode) (cons "\\.tbz\\'" 'tar-mode))
|
||
"A list of pairs to add to `auto-mode-alist' when jka-compr is installed."
|
||
:type '(repeat (cons string symbol))
|
||
:group 'jka-compr)
|
||
|
||
(defcustom jka-compr-load-suffixes '(".gz")
|
||
"List of suffixes to try when loading files."
|
||
:type '(repeat string)
|
||
:group 'jka-compr)
|
||
|
||
;; List of all the elements we actually added to file-coding-system-alist.
|
||
(defvar jka-compr-added-to-file-coding-system-alist nil)
|
||
|
||
(defvar jka-compr-file-name-handler-entry
|
||
nil
|
||
"The entry in `file-name-handler-alist' used by the jka-compr I/O functions.")
|
||
|
||
(defun jka-compr-build-file-regexp ()
|
||
(mapconcat
|
||
'jka-compr-info-regexp
|
||
jka-compr-compression-info-list
|
||
"\\|"))
|
||
|
||
;;; Functions for accessing the return value of jka-compr-get-compression-info
|
||
(defun jka-compr-info-regexp (info) (aref info 0))
|
||
(defun jka-compr-info-compress-message (info) (aref info 1))
|
||
(defun jka-compr-info-compress-program (info) (aref info 2))
|
||
(defun jka-compr-info-compress-args (info) (aref info 3))
|
||
(defun jka-compr-info-uncompress-message (info) (aref info 4))
|
||
(defun jka-compr-info-uncompress-program (info) (aref info 5))
|
||
(defun jka-compr-info-uncompress-args (info) (aref info 6))
|
||
(defun jka-compr-info-can-append (info) (aref info 7))
|
||
(defun jka-compr-info-strip-extension (info) (aref info 8))
|
||
(defun jka-compr-info-file-magic-bytes (info) (aref info 9))
|
||
|
||
|
||
(defun jka-compr-get-compression-info (filename)
|
||
"Return information about the compression scheme of FILENAME.
|
||
The determination as to which compression scheme, if any, to use is
|
||
based on the filename itself and `jka-compr-compression-info-list'."
|
||
(catch 'compression-info
|
||
(let ((case-fold-search nil))
|
||
(mapcar
|
||
(function (lambda (x)
|
||
(and (string-match (jka-compr-info-regexp x) filename)
|
||
(throw 'compression-info x))))
|
||
jka-compr-compression-info-list)
|
||
nil)))
|
||
|
||
(defun jka-compr-install ()
|
||
"Install jka-compr.
|
||
This adds entries to `file-name-handler-alist' and `auto-mode-alist'
|
||
and `inhibit-first-line-modes-suffixes'."
|
||
|
||
(setq jka-compr-file-name-handler-entry
|
||
(cons (jka-compr-build-file-regexp) 'jka-compr-handler))
|
||
|
||
(setq file-name-handler-alist (cons jka-compr-file-name-handler-entry
|
||
file-name-handler-alist))
|
||
|
||
(setq jka-compr-added-to-file-coding-system-alist nil)
|
||
|
||
(mapcar
|
||
(function (lambda (x)
|
||
;; Don't do multibyte encoding on the compressed files.
|
||
(let ((elt (cons (jka-compr-info-regexp x)
|
||
'(no-conversion . no-conversion))))
|
||
(setq file-coding-system-alist
|
||
(cons elt file-coding-system-alist))
|
||
(setq jka-compr-added-to-file-coding-system-alist
|
||
(cons elt jka-compr-added-to-file-coding-system-alist)))
|
||
|
||
(and (jka-compr-info-strip-extension x)
|
||
;; Make entries in auto-mode-alist so that modes
|
||
;; are chosen right according to the file names
|
||
;; sans `.gz'.
|
||
(setq auto-mode-alist
|
||
(cons (list (jka-compr-info-regexp x)
|
||
nil 'jka-compr)
|
||
auto-mode-alist))
|
||
;; Also add these regexps to
|
||
;; inhibit-first-line-modes-suffixes, so that a
|
||
;; -*- line in the first file of a compressed tar
|
||
;; file doesn't override tar-mode.
|
||
(setq inhibit-first-line-modes-suffixes
|
||
(cons (jka-compr-info-regexp x)
|
||
inhibit-first-line-modes-suffixes)))))
|
||
jka-compr-compression-info-list)
|
||
(setq auto-mode-alist
|
||
(append auto-mode-alist jka-compr-mode-alist-additions))
|
||
|
||
;; Make sure that (load "foo") will find /bla/foo.el.gz.
|
||
(setq load-suffixes
|
||
(apply 'append
|
||
(mapcar (lambda (suffix)
|
||
(cons suffix
|
||
(mapcar (lambda (ext) (concat suffix ext))
|
||
jka-compr-load-suffixes)))
|
||
load-suffixes))))
|
||
|
||
|
||
(defun jka-compr-installed-p ()
|
||
"Return non-nil if jka-compr is installed.
|
||
The return value is the entry in `file-name-handler-alist' for jka-compr."
|
||
|
||
(let ((fnha file-name-handler-alist)
|
||
(installed nil))
|
||
|
||
(while (and fnha (not installed))
|
||
(and (eq (cdr (car fnha)) 'jka-compr-handler)
|
||
(setq installed (car fnha)))
|
||
(setq fnha (cdr fnha)))
|
||
|
||
installed))
|
||
|
||
(define-minor-mode auto-compression-mode
|
||
"Toggle automatic file compression and uncompression.
|
||
With prefix argument ARG, turn auto compression on if positive, else off.
|
||
Returns the new status of auto compression (non-nil means on)."
|
||
:global t :group 'jka-compr
|
||
(let* ((installed (jka-compr-installed-p))
|
||
(flag auto-compression-mode))
|
||
(cond
|
||
((and flag installed) t) ; already installed
|
||
((and (not flag) (not installed)) nil) ; already not installed
|
||
(flag (jka-compr-install))
|
||
(t (jka-compr-uninstall)))))
|
||
|
||
(defmacro with-auto-compression-mode (&rest body)
|
||
"Evalute BODY with automatic file compression and uncompression enabled."
|
||
(let ((already-installed (make-symbol "already-installed")))
|
||
`(let ((,already-installed (jka-compr-installed-p)))
|
||
(unwind-protect
|
||
(progn
|
||
(unless ,already-installed
|
||
(jka-compr-install))
|
||
,@body)
|
||
(unless ,already-installed
|
||
(jka-compr-uninstall))))))
|
||
(put 'with-auto-compression-mode 'lisp-indent-function 0)
|
||
|
||
|
||
;;; This is what we need to know about jka-compr-handler
|
||
;;; in order to decide when to call it.
|
||
|
||
(put 'jka-compr-handler 'safe-magic t)
|
||
(put 'jka-compr-handler 'operations '(jka-compr-byte-compiler-base-file-name
|
||
write-region insert-file-contents
|
||
file-local-copy load))
|
||
|
||
;;; Turn on the mode.
|
||
(auto-compression-mode 1)
|
||
|
||
(provide 'jka-cmpr-hook)
|
||
|
||
;; arch-tag: 4bd73429-f400-45fe-a065-270a113e31a8
|
||
;;; jka-cmpr-hook.el ends here
|