Paginate and limit based on number of pages

[Globerada]

Hi.
I have not found this information in the docs.

How can I achieve a paginate based on the numbers of pages that the URL have?
Below is the example that I am using. Instead of a high limit so I can crawl all the pages, how can I put a valid limit base on the real number of pages?

x('http://www.example.com/products', 'div.products_details_container', data)
.paginate('.pagination a:last-Child@href')
.limit(999)
.write('results.json');

[Daniel Lathrop]

The current approach is not to use a limit, but create your selector such that it will stop once you run out... which yours probably should.