I'm a ruleset reviewer for https://github.com/EFForg/https-everywhere , which is a browser add-on that rewrites some HTTP URLs to HTTPS while the user is browsing. Part of creating rules for HTTPS Everywhere is finding subdomains for a particular root domain. Sublist3r looks like a good tool for this, for example see the discussion in EFForg/https-everywhere#6912 , but we have a particular sort order we like subdomains to have in our ruleset files.

This pull request changes the sort order of the displayed subdomains to match our preferred sort order. You can test it by running the below script in the main Sublist3r directory.

If you want to allow this change but want to hide it behind an optional flag instead of changing the default behavior, or you want tests or style changes, please let me know. Thanks.

import functools
import random
random.seed(0)

from sublist3r import subdomain_cmp


correct_output = [
    'example.com',
    'www.example.com',
    'a.example.com',
    'www.a.example.com',
    'b.a.example.com',
    'b.example.com',
    'example.net',
    'www.example.net',
    'a.example.net',
]

if __name__ == '__main__':
    scrambled_input = correct_output[:]
    random.shuffle(scrambled_input)

    computed_output = sorted(
        scrambled_input,
        key=functools.cmp_to_key(subdomain_cmp),
    )

    print("%s\n" % '\n'.join(['Input:'] + scrambled_input))
    print("%s\n" % '\n'.join(['Output:'] + computed_output))
    print("Output is correct: %s" % (correct_output == computed_output))