Awstats-update is a project mainly written in Python, it's free.
A simple cronjobs for autogenerate awstats conffiles from nginx sites-enables (like Debian style) files
These scripts can be used as cronjob as folling:
0,10,20,30,40,50 root python /etc/awstats/scripts/auto-generator.py 0,11,21,31,41,51 root /etc/awstats/awstats-update > /dev/null