def is_interested_source_code_file(afile):
    """
    If a file is the source code file that we are interested.
    """
    tokens = afile.split(".")
    if len(tokens) > 1 and tokens[-1] in ("c", "cpp", "pl", "tmpl", "py", "s", "S"):
        # we care about C/C++/perl/template/python/assembly source code files
        return True
    return False