You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: display_file_command.rb
    path of file: ./repos/yard/lib/yard/server/commands
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
module YARD
  module Server
    module Commands
      # Displays a README or extra file.
      #
      # @todo Implement better support for detecting binary (image) filetypes
      class DisplayFileCommand < LibraryCommand
        attr_accessor :index

        def run
      
    
        def run
          filename = File.cleanpath(File.join(library.source_path, path))
          raise NotFoundError unless File.file?(filename)
          if filename =~ /\.(jpe?g|gif|png|bmp|svg)$/i
            headers['Content-Type'] = StaticFileCommand::DefaultMimeTypes[$1.downcase] || 'text/html'
            render File.read_binary(filename)
          else
            file = CodeObjects::ExtraFileObject.new(filename)
            options.update :object => Registry.root,
                           :type => :layout,
                           :file => file,
                           :index => index ? true : false
            render
          end