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import shutil

def log(s, end = "\n"):

    print(s, end = end, flush = True)

def require_tools(names):

    assert(type(names) == list or type(names) == tuple)

    for name in names:

        assert(type(name) == str)

    not_found = []

    for name in names:

        if shutil.which(name) is None:

            not_found.append(name)

    if len(not_found) != 0:

        log("Sorry, I can't find some tools:")

        for name in not_found:

            print(f"- {name}")

        exit(1)