eruby (sorry for the extra E) interprets a RubyLanguage code embedded text file. For example, eruby enables you to embed a Ruby code to a HTML file. 

http://raa.ruby-lang.org/project/eruby/

It's just the usual template system:

  <% if boolean_value %>
    <em><%= ruby_string %></em>
  <% end %>

Wanted: A version of HtmlTidy that skips over these instead of freaking out.

See also MongrelEeRuby.
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CategoryRuby