wiki_words.rb

# Turn [[WikiLinks]] into internal links.
# add the `wikiwords` filter to your list of filters, then you can write
# links to other pages in your webby app like this [[OtherPage]] and it will 
# automatically link that to "/OtherPage.html"
module WikiLinkHelper

  def linkify_bracketed_phrases(string)
    string.gsub(/\[\[([^\]]+)\]\]/) do
      begin
        link_to_page($1)
      rescue ::Webby::Error => e
        "<a class=\"missing internal\">#{$1}</a>"
      end
    end
  end

end

Webby::Helpers.register(WikiLinkHelper)

Webby::Filters.register :wikiwords do |input, cursor|
  cursor.renderer.linkify_bracketed_phrases(input)
end