# File lib/pry/commands/hist.rb, line 36
    def process
      @history = find_history

      if opts.present?(:show)
        @history = @history.between(opts[:show])
      end

      if opts.present?(:grep)
        @history = @history.grep(opts[:grep])
      end

      @history = case
        when opts.present?(:head)
          @history.take_lines(1, opts[:head] || 10)
        when opts.present?(:tail)
          @history.take_lines(-(opts[:tail] || 10), opts[:tail] || 10)
        when opts.present?(:show)
          @history.between(opts[:show])
        else
          @history
        end

      if opts.present?('exclude-pry''exclude-pry')
        @history = @history.select do |loc|
                     !command_set.valid_command?(loc.line)
                   end
      end

      if opts.present?(:save)
        process_save
      elsif opts.present?(:clear)
        process_clear
      elsif opts.present?(:replay)
        process_replay
      else
        process_display
      end
    end