Linguist: finds shared interpreters, filenames, extensions, etc. between any 2 languages.

find-shared.py

#!/usr/bin/env python
import yaml
import sys

with open("lib/linguist/languages.yml", 'r') as stream:
    try:
        languages = yaml.load(stream)
    except yaml.YAMLError as exc:
        print(exc)

for langname1, lang1 in languages.items():
    if sys.argv[1] in lang1:
        for langname2, lang2 in languages.items():
            if langname1 != langname2 and sys.argv[1] in lang2:
                shared = set(lang1[sys.argv[1]]).intersection(lang2[sys.argv[1]])
                if len(shared) > 0:
                    print("%s and %s share %s" % (langname1, langname2, shared))