require 'html/pipeline'

class HelpMarkdownFilter < HTML::Pipeline::MarkdownFilter

  def call
    html = super

    format_callout!(html)
  end

  def format_callout!(html)
    html.gsub!(/(?:<p>)?{{#(tip|warning|error)}}(?:<\/p>)?/,  '<div class="alert \1">')
    html.gsub!(/(?:<p>)?{{\/(tip|warning|error)}}(?:<\/p>)?/, '</div>')
  end
end