def toc_structure_from_headers(headers, toc = [])
  if headers.empty?
    return []
  end

  depth = headers[0][:depth]

  while header = headers[0]
    if header[:depth] == depth
      toc << { id: header[:id], text: header[:text], children: [] }
      headers.shift
    elsif header[:depth] < depth
      break;
    else
      toc_structure_from_headers(headers, toc[-1][:children])
    end
  end

  toc
end