def show_rewriter
      group, name = @options[:snippet_name].split('/')
      rewriter = Core::Rewriter.fetch(group, name)
      if rewriter
        rewriter.process_with_sandbox
        puts rewriter.description
        rewriter.sub_snippets.each do |sub_rewriter|
          puts
          puts '=' * 80
          puts "snippet: #{sub_rewriter.name}"
          puts '=' * 80
          puts sub_rewriter.description
        end
      else
        puts "snippet #{@options[:snippet_name]} not found"
      end
    end
def show_rewriter
      group, name = @options[:snippet_name].split('/')
      rewriter = Core::Rewriter.fetch(group, name)
      if rewriter
        rewriter.process_with_sandbox
        puts rewriter.description
        rewriter.sub_snippets.each do |sub_rewriter|
          puts
          puts '=' * 80
          puts "snippet: #{sub_rewriter.name}"
          puts '=' * 80
          puts sub_rewriter.description
        end
      else
        puts "snippet #{@options[:snippet_name]} not found"
      end
    end
Show and print one rewriter.