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: graph.rb
    path of file: ./repos/ruby-packer/ruby/lib/bundler
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require "set"
module Bundler
  class Graph
    GRAPH_NAME = :Gemfile

    def initialize(env, output_file, show_version = false
    
      def g
        @g ||= ::GraphViz.digraph(@graph_name, :concentrate => true, :normalize => true, :nodesep => 0.55) do |g|
          g.edge[:weight]   = 2
          g.edge[:fontname] = g.node[:fontname] = "Arial, Helvetica, SansSerif"
          g.edge[:fontsize] = 12
        end
      end