module Middleman::Sitemap::Extensions::Traversal

def children
  return [] unless directory_index?
  base_path = if eponymous_directory?
    eponymous_directory_path
  else
    path.sub(@app.config[:index_file].to_s, '')
  end
  prefix = %r{^#{base_path.sub("/", "\\/")}}
  @store.resources.select do |sub_resource|
    if sub_resource.path == path || sub_resource.path !~ prefix
      false
    else
      inner_path = sub_resource.path.sub(prefix, '')
      parts = inner_path.split('/')
      if parts.length == 1
        true
      elsif parts.length == 2
        parts.last == @app.config[:index_file]
      else
        false
      end
    end
  end
end