# File lib/guard/interactors/readline.rb, line 47
    def read_line
      while line = Readline.readline(prompt, true)
        line.gsub!(/^\W*/, '')
        if line =~ /^\s*$/ or Readline::HISTORY.to_a[-2] == line
          Readline::HISTORY.pop
        end

        process_input(line)
      end
    end