1module GitHub
 2  module Markup
 3    extend self
 4    @@markups = {}
 5
 6    def add_markup(regexp, &block)
 7      @@markups[regexp] = block
 8    end
 9
10    def renderer(filename)
11      @@markups.each do |key, value|
12        if Regexp.compile("#{key}$") =~ filename
13          return value
14        end
15      end
16    end
17
18    def render(filename, content)
19      renderer(filename)[content] || content
20    end
21  end
22end
23
24begin
25  require 'rdiscount'
26  GitHub::Markup.add_markup(/md|mkdn?|markdown/) do |content|
27    Markdown.new(content).to_html
28  end
29rescue LoadError
30  nil
31end
32
33begin
34  require 'redcloth'
35  GitHub::Markup.add_markup(/textile/) do |content|
36    RedCloth.new(content).to_html
37  end
38rescue LoadError
39  nil
40end