class Metanorma::Generic::Processor

def extract_options(file)
  head = file.sub(/\n\n.*$/m, "\n")
  ret = %w(htmlstylesheet htmlcoverpage htmlintropage scripts scripts-pdf
           wordstylesheet standardstylesheet header wordcoverpage
           wordintropage datauriimage htmltoclevels doctoclevels
           ulstyle olstyle htmlstylesheet-override sectionsplit
           wordstylesheet-override).each_with_object({}) do |w, acc|
    m = /\n:#{w}: ([^\n]+)\n/.match(head) or next
    acc[w.sub("-", "_").to_sym] = m[1]
  end
  super.merge(ret)
end