Spreadsheet gem add header to every page

gistfile1.rb

module Spreadsheet
  module Excel
    module Writer
      class Worksheet
        alias_method :write_from_scratch_without_header, :write_from_scratch
        def write_header
          write_op opcode(:header), [@worksheet.header.bytesize, 0].pack("vC"), @worksheet.header
        end
        def write_from_scratch
          write_header
          write_from_scratch_without_header
        end
      end
    end
  end
  class Worksheet
    attr_accessor :header
    def add_header(str)
      @header = str
    end
  end
end