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: shell.rb
    path of file: ./repos/honeybadger-ruby/vendor/cli/thor
    
    the code of the file until where you have to start completion: require "rbconfi
    
      def shell
        @shell ||= if ENV["THOR_SHELL"] && ENV["THOR_SHELL"].size > 0
          Thor::Shell.const_get(ENV["THOR_SHELL"])
        elsif RbConfig::CONFIG["host_os"] =~ /mswin|mingw/ && !ENV["ANSICON"]
          Thor::Shell::Basic
        else
          Thor::Shell::Color
        end