def load_data(fn):
    try:
        with open(fn) as f:
            data = f.read().split("\n")
            data = set(data)
            data.discard("") #TODO
    except FileNotFoundError:
        data = set()
    return data

def save_data(data, fn):
    with open(fn, "w") as f:
        data = "\n".join(sorted(data))
        f.write(data)

def mk_db(data, fn):
    with open(fn, "w") as f:
        for name in data:
            entry = f'record(stringin, "$(SYSTEM):{name}") {{}}'
            f.write(entry)
            f.write("\n")