very ugly and simplistic way to let people create plugins with only some json

engine.py

#!/usr/bin/env python3                                                                                                                                                                                                                  """ mockup language engine for plugins """
                                                                                                                    import json
js = '{"name":"command_name", "prompt": [{"question": "where do you want to ping", "var": "dest"},{"question": "ping from", "var": "src"}], "handler": "some_function", "query": "ping $dest from $src"}'

j = json.loads(js)

def some_function(j):
    print(f"command: {j['name']}")
    answer = {}
    for q in j['prompt']:
        answer[q['var']] = input(f"{q['question']}: ")

    print(f"q before interpret: {j['query']}")

    for key, value in answer.items():
        if f"${key}" in j['query']:
            j['query'] = j['query'].replace(f"${key}", value)
    print(j['query'])

some_function(j)