# File lib/termtter/client.rb, line 356
      def confirm(message, default_yes = true, &block)
        pause # TODO: TaskManager から呼ばれるならこれいらないなぁ

        result = # Boolean in duck typing
          if default_yes
            prompt = "\"#{message}".strip + "\" [Y/n] "
            /^y?$/i =~ Readline.readline(prompt, false)
          else
            prompt = "\"#{message}".strip + "\" [N/y] "
            /^n?$/i =~ Readline.readline(prompt, false)
          end

        if result && block
          block.call
        end

        result
      ensure
        resume # TODO: TaskManager から呼ばれるならこれいらないなぁ
      end