user_supplied_options

# File railties/lib/rails/commands/server/server_command.rb, line 175
        def user_supplied_options
          @user_supplied_options ||= begin
            # Convert incoming options array to a hash of flags
            #   ["-p3001", "-C", "--binding", "127.0.0.1"] # => {"-p"=>true, "-C"=>true, "--binding"=>true}
            user_flag = {}
            @original_options.each do |command|
              if command.to_s.start_with?("--")
                option = command.split("=")[0]
                user_flag[option] = true
              elsif command =~ /\A(-.)/
                user_flag[Regexp.last_match[0]] = true
              end
            end

            # Collect all options that the user has explicitly defined so we can
            # differentiate them from defaults
            user_supplied_options = []
            self.class.class_options.select do |key, option|
              if option.aliases.any? { |name| user_flag[name] } || user_flag["--#{option.name}"]
                name = option.name.to_sym
                case name
                when :port
                  name = :Port
                when :binding
                  name = :Host
                when :dev_caching
                  name = :caching
                when :daemonize
                  name = :daemon
                end
                user_supplied_options << name
              end
            end
            user_supplied_options << :Host if ENV["HOST"] || ENV["BINDING"]
            user_supplied_options << :Port if ENV["PORT"]
            user_supplied_options.uniq
          end
        end