code: def to_rtf(indent=0)
           prefix = indent > 0 ? ' ' * indent : ''
           text   = StringIO.new
           text << "#{prefix}{\\fonttbl"
           @fonts.each_index do |index|
              text << "\n#{prefix}{\\f#{index}#{@fonts[index].to_rtf}}"
           end
           text << "\n#{prefix}}"
           text.string
        end
docs: This method generates the RTF text for a FontTable object.
  
   ==== Parameters
   indent::  The number of spaces to prefix to the lines generated by the
             method. Defaults to zero.