path: root/_plugins/add-anchor-to-header-from-header-id.rb

Jekyll::Hooks.register :documents, :post_render do |doc|
  if doc.output_ext == ".html"
    doc.output =
      doc.output.gsub(
        /<h([1-6])(.*?)id="([\w-]+)"(.*?)>(.*?)<\/h[1-6]>/,
        '<a class="header-anchor" id="\3-header-anchor" href="#\3"><h\1\2id="\3"\4>\5<img class="simple-icon" src="/images/link.svg" aria-hidden="true" /></h\1></a>'
      )
  end
end