parse_options method in pry/cli.rb

pry-cli-parse-options.rb

      def parse_options(args=ARGV.dup)
        unless options
          raise NoOptionsError, "No command line options defined! Use Pry::CLI.add_options to add command line options."
        end

        self.input_args = args

        opts = Slop.parse!(args, :help => true, :multiple_switches => false, &options)

        # Option processors are optional.
        if option_processors
          option_processors.each { |processor| processor.call(opts) }
        end

        self
      end