How does the stuff in library/ work

[Jonny007-MKD]

Hi,
I am using your openwrt role to manage my router. Now I'd like to implement the argv functionality of the command command, and I looked at the shell scripts in library/. It seems like there is some wrapper code from python which loads the corresponding shell script, passes the argument variables, executes main() and extracts the result variables. Can you point me to where this happens? Is it an official ansible functionality or implemented by you?

Thanks,
Jonathan