class Middleman::Extensions::DirectoryIndexes

def manipulate_resource_list(resources)
  index_file = app.index_file
  new_index_path = "/#{index_file}"
  resources.each do |resource|
    # Check if it would be pointless to reroute
    next if resource.destination_path == index_file ||
            resource.destination_path.end_with?(new_index_path) ||
            File.extname(index_file) != resource.ext
    # Check if frontmatter turns directory_index off
    next if resource.raw_data[:directory_index] == false
    # Check if file metadata (options set by "page" in config.rb) turns directory_index off
    next if resource.metadata[:options][:directory_index] == false
    resource.destination_path = resource.destination_path.chomp(File.extname(index_file)) + new_index_path
  end
end