在rails中打印东西(字面意思是打印机)

I'm wondering if there was any library or gem available in Rails for printing the contents of a web page, as in literally on to paper via a printer. I was also wondering if there was any way you can specify that only a specific part of the page (e.g. a div or something) would be printed? Any pointers, advice, or links to tutorials would be appreciated! I'm wondering if there was any library or gem a