Jekyll::Hooks.register [:documents, :pages], :post_render do |doc|
  if doc.output_ext == ".html" && doc.type != :slides
    lang = doc.data["lang"]
    alt = doc.site.site_payload["site"]["t"]["alt"]["link_icon"][lang]
    doc.output =
      doc.output.gsub(
        /<h([1-6])(.*?)id="([\w-]+)"(.*?)>(.*?)<\/h[1-6]>/,
        '<div class="header-anchor"><h\1\2id="\3"\4>\5</h\1><a href="#\3"><img class="simple-icon" src="/static/link.svg" aria-hidden="true" alt="' + alt + '" /></a></div>'
      )
  end
end