New formula: docbook.

DocBook is XML. A lot of XML.
Unfortunately, to some people, it is still used by a lot of projects,
like git, to generate their documentation, and not all of these, like
everything except git, provide pre-built documentation for download.

This formula installs all currently released docbook-xml and the most
recent docbook-xsl package and stuffs them all in the Cellar. In
addition, a script is provided that registers all of these packages in
the global XML catalog, as noted in the caveats.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/docbook.rb

@@ -0,0 +1,84 @@
+require 'formula'
+
+class Docbook <Formula
+  url 'http://gist.github.com/raw/462528/098ccc609b039cf5b6d11fcd9c8ef333c3861b65/docbook-register'
+  md5 '0fbc35a136190050de3598354655fd82'
+  version '5.0'
+  homepage 'http://docbook.sourceforge.net/'
+
+  def caveats
+    <<-EOS.undent
+      To use the DocBook package in your XML toolchain, you need to
+      register it with the global XML catalog with this command:
+      
+        sudo docbook-register
+    EOS
+  end
+
+  def packages; [
+    Docbookxml412,
+    Docbookxml42,
+    Docbookxml43,
+    Docbookxml44,
+    Docbookxml45,
+    Docbookxml50,
+    Docbookxsl,
+  ]; end
+
+  def install
+    bin.install 'docbook-register'
+    packages.each do |pkg|
+      pkg.new.brew { |formula| formula.install }
+    end
+  end
+end
+
+class Docbookxml <Formula
+  def install
+    rm_rf 'docs'
+    docbook = Formula.factory 'docbook'
+    (docbook.prefix+'docbook/xml'+version).install Dir['*']
+  end
+end
+class Docbookxml412 <Docbookxml
+  url 'http://www.docbook.org/xml/4.1.2/docbkx412.zip'
+  md5 '900d7609fb7e6d78901b357e4acfbc17'
+  version '4.1.2'
+  homepage 'http://www.docbook.org/'
+end
+class Docbookxml42 <Docbookxml
+  url 'http://www.docbook.org/xml/4.2/docbook-xml-4.2.zip'
+  md5 '73fe50dfe74ca631c1602f558ed8961f'
+  homepage 'http://www.docbook.org/'
+end
+class Docbookxml43 <Docbookxml
+  url 'http://www.docbook.org/xml/4.3/docbook-xml-4.3.zip'
+  md5 'ab200202b9e136a144db1e0864c45074'
+  homepage 'http://www.docbook.org/'
+end
+class Docbookxml44 <Docbookxml
+  url 'http://www.docbook.org/xml/4.4/docbook-xml-4.4.zip'
+  md5 'cbb04e9a700955d88c50962ef22c1634'
+  homepage 'http://www.docbook.org/'
+end
+class Docbookxml45 <Docbookxml
+  url 'http://www.docbook.org/xml/4.5/docbook-xml-4.5.zip'
+  md5 '03083e288e87a7e829e437358da7ef9e'
+  homepage 'http://www.docbook.org/'
+end
+class Docbookxml50 <Docbookxml
+  url 'http://www.docbook.org/xml/5.0/docbook-5.0.zip'
+  md5 '2411c19ed4fb141f3fa3d389fae40736'
+  homepage 'http://www.docbook.org/'
+end
+class Docbookxsl <Formula
+  url 'http://downloads.sourceforge.net/project/docbook/docbook-xsl/1.75.2/docbook-xsl-1.75.2.tar.bz2'
+  md5 '0c76a58a8e6cb5ab49f819e79917308f'
+  homepage 'http://docbook.sourceforge.net/'
+  def install
+    doc_files = %w[AUTHORS BUGS README RELEASE-NOTES.txt TODO VERSION NEWS COPYING]
+    xsl_files = %w[catalog.xml common eclipse extensions fo highlighting html htmlhelp images javahelp lib manpages params profiling roundtrip slides template tools website xhtml xhtml-1_1]
+    docbook = Formula.factory 'docbook'
+    (docbook.prefix+'docbook/xsl'+version).install xsl_files + doc_files
+  end
+end