The prechacthis repository patched:

• unnecessary dirs and files removed
• src/index.php updated
• src/info.php updated
• src/pl/siteswap_preprocessing.pl updated
• src/python added (calculate animation link)
• src/pl/siteswap_info.pl modified (display animation link).

Runs at https://neoprechac.org with swi-prolog 9.2.7 on ubuntu.

Animation link:

• passist when gcd(pattern length, number of jugglers) = 1
• jugglinglab otherwise:
  • async when pattern length % number of jugglers = 0
  • sync in the remaining cases:
    • under construction
    • all the cases with four jugglers should be more or less okay
    • the case with six jugglers and period three is there but may bug
    • no link displayed in other cases.

Thanks to Miika Toukola for help!