gistfile1.rb

class ToTextFilter < ::Nanoc3::Filter
  identifier :to_text
  type :binary => :text
  def run(filename, params={})
    File.read(filename)
  end
end

class ToBinaryFilter < ::Nanoc3::Filter
  identifier :to_binary
  type :text => :binary
  def run(content, params={})
    IO.open(output_filename, 'w') { |io| io.write(content) }
  end
end