Ruby script for generating Google sitemaps

I just wrote a small Ruby script to generate a Google sitemap out of file directory. I thought that it might come handy as a quick start for someone, so here is the code (requires the builder gem)

require 'builder'
htmlfiles = Dir.glob("*.html")
x = Builder::XmlMarkup.new(:target => $stdout, :indent => 1)
x.instruct!
x.urlset( "xmlns" => "http://www.sitemaps.org/schemas/sitemap/0.9" ) {
for file in htmlfiles do
x.url{x.loc "http://www.example.com/#{file}"; x.lastmod "2009-09-17"; x.changefreq "monthly"; x.priority "0.8"}
end
}

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