Create Sitemap for a website

I need a sitemap for my website. The code will be called using input query string (crawl or display). The display link will be used by google to be used as sitemap. The crawl option must crawl and collect sitemap. The display option will use the last completed crawl data. Crawling can take time and hence the code must ensure that timeout does not occur (use CLI if required). XML format Sitemap Protocol 0.9 Inputs: Mode=Crawl (to crawl and get the links) and Mode=display (to display the sitemap) base-url= option will provide the base link to start scanning. pagination= will restrict the maximum depth (optional field)