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<H2><A NAME="s6">6. 使用 bzip2 来结合 emacs</A></H2>

<H2><A NAME="ss6.1">6.1 为每个人改变 emacs:</A>
</H2>

<P>我写了下面的给 jka-compr.el 用的修补，它会加入 bzip2 成为自动压缩模式。
<P><B>除外条款:</B> 我只在 emacs-20.2上试过这个，但是我也找不到有
啥麽理由来相信同样的方法却不能在其他版本上使用的。
<P>使用它，
<OL>
<LI>到 emacs-20.2/lisp 原始程式码目录□ (看你在哪儿 untarred 它的)</LI>
<LI>把下面的修补做成叫 jka-compr.el.diff 的档案(全放在这档案□
)。</LI>
<LI>然後执行
<BLOCKQUOTE><CODE>
<PRE>
 patch &lt; jka-compr.el.diff
</PRE>
</CODE></BLOCKQUOTE>
</LI>
<LI>启动 emacs，再执行
<BLOCKQUOTE><CODE>
<PRE>
 M-x byte-compile-file jka-compr.el
</PRE>
</CODE></BLOCKQUOTE>
</LI>
<LI>离开 emacs。</LI>
<LI>把它原来的 jka-compr.elc 放到安全的地方以防有臭虫时备用。</LI>
<LI>用新的 jka-compr.elc来代替它。</LI>
<LI>好好玩吧!</LI>
</OL>

<PRE>
--- jka-compr.el        Sat Jul 26 17:02:39 1997
+++ jka-compr.el.new    Thu Feb  5 17:44:35 1998
@@ -44,7 +44,7 @@
 ;; The variable, jka-compr-compression-info-list can be used to
 ;; customize jka-compr to work with other compression programs.
 ;; The default value of this variable allows jka-compr to work with
-;; Unix compress and gzip.
+;; Unix compress and gzip.  David Fetter added bzip2 support :)
 ;;
 ;; If you are concerned about the stderr output of gzip and other
 ;; compression/decompression programs showing up in your buffers, you
@@ -121,7 +121,9 @@


 ;;; I have this defined so that .Z files are assumed to be in unix
-;;; compress format; and .gz files, in gzip format.
+;;; compress format; and .gz files, in gzip format, and .bz2 files,
+;;; in the snappy new bzip2 format from http://www.muraroa.demon.co.uk.
+;;; Keep up the good work, people!
 (defcustom jka-compr-compression-info-list
   ;;[regexp
   ;; compr-message  compr-prog  compr-args
@@ -131,6 +133,10 @@
      "compressing"    "compress"     ("-c")
      "uncompressing"  "uncompress"   ("-c")
      nil t]
+    ["\\.bz2\\'"
+     "bzip2ing"        "bzip2"         ("")
+     "bunzip2ing"      "bzip2"         ("-d")
+     nil t]
     ["\\.tgz\\'"
      "zipping"        "gzip"         ("-c" "-q")
      "unzipping"      "gzip"         ("-c" "-q" "-d")
</PRE>
<P>
<H2><A NAME="ss6.2">6.2 为某人改变 emacs:</A>
</H2>

<P>这次要谢谢 Ulrik Dickow, 
<A HREF="mailto:ukdATkampsax.dk">ukd@kampsax.dk</A>，他是Kampsax Technology的系统程式设计师 :
<P>为了让非 sysadmin 的朋友可以自动地使用 bzip2，只需在你的
.emacs 档案□加上下列东东。
<P>
<PRE>
;; Automatic (un)compression on loading/saving files (gzip(1) and similar)
;; We start it in the off state, so that bzip2(1) support can be added.
;; Code thrown together by Ulrik Dickow for ~/.emacs with Emacs 19.34.
;; Should work with many older and newer Emacsen too.  No warranty though.
;;
(if (fboundp 'auto-compression-mode) ; Emacs 19.30+
    (auto-compression-mode 0)
  (require 'jka-compr)
  (toggle-auto-compression 0))
;; Now add bzip2 support and turn auto compression back on.
(add-to-list 'jka-compr-compression-info-list
             ["\\.bz2\\(~\\|\\.~[0-9]+~\\)?\\'"
              "zipping"        "bzip2"         ()
              "unzipping"      "bzip2"         ("-d")
              nil t])
(toggle-auto-compression 1 t)
</PRE>
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