class Tilt::PandocTemplate

def pandoc_options
  result = []
  from = "markdown"
  smart_extension = "-smart"
  options.each do |k,v|
    case k
    when :smartypants
      smart_extension = "+smart" if v
    when :escape_html
      from = "markdown-raw_html" if v
    when :commonmark
      from = "commonmark" if v
    when :markdown_strict
      from = "markdown_strict" if v
    else
      case v
      when true
        result << k
      when false
        # do nothing
      else
        result << { k => v }
      end
    end
  end
  result << { :f => from + smart_extension }
  result
end