Alternative to https://github.com/olivierlacan/keep-a-changelog/blob/gh-pages/generate.thor

## Rakefile
require 'redcarpet'

desc "generate index.html from README.md"
file "index.html" => "README.md" do |task|
  puts "Processing README.md to generate a new index.html..."

  # `r` means we're using the "read" mode with the file
  # we need a String for Redcarpet, it doesn't accept File objects.
  string = File.open(task.prerequisites.first, 'r') { |file| file.read }
  markdown = ::Redcarpet::Markdown.new(Redcarpet::Render::HTML, extensions = {})

  rendered_markdown = markdown.render(string)

  html_output = template { rendered_markdown }

  File.open(task.name, 'w') { |file| file.write(html_output) }

  puts "All done!"
end

def template(&block)
  <<-HTML.gsub /^\s+/, ""
    <html>
      <head>
        <title>Keep a Changelog</title>
        <link rel="stylesheet" href="assets/stylesheets/normalize.css" media="screen" charset="utf-8">
        <link rel="stylesheet" href="assets/stylesheets/style.css" media="screen" charset="utf-8">
        <script type="text/javascript" src="//use.typekit.net/tng8liq.js"></script>
        <script type="text/javascript">try{Typekit.load();}catch(e){}</script>
      </head>
      <body>
        <article>
          #{yield}
          <footer class="clearfix">
            <p class="license">This project is <a href="http://choosealicense.com/licenses/mit/">MIT Licensed</a>.</p>
            <p class="about"><a href="https://github.com/olivierlacan/keep-a-changelog/">Typed</a> with trepidation by <a href="http://olivierlacan.com">Olivier Lacan</a> from <a href="http://codeschool.com">Code School</a>.</p>
          </footer>
        </article>
        <script type="text/javascript">
          var _gauges = _gauges || [];
          (function() {
            var t   = document.createElement('script');
            t.type  = 'text/javascript';
            t.async = true;
            t.id    = 'gauges-tracker';
            t.setAttribute('data-site-id', '5389808eeddd5b055a00440d');
            t.src = '//secure.gaug.es/track.js';
            var s = document.getElementsByTagName('script')[0];
            s.parentNode.insertBefore(t, s);
          })();
        </script>
      </body>
    </html>
  HTML
end