def METHOD_NAME(args):
    """Controller function for adding q-values"""
    nuc_data, build_dir = args.nuc_data, args.build_dir
    if os.path.exists(nuc_data):
        with tb.open_file(nuc_data, "r") as f:
            if "/decay/q_values" in f:
                print("skipping q_value table creation; already exists.")
                return
    # Grab the q_values
    print("Grabbing q_values...")
    q_value_files = [
        "q_val_actinides.csv",
        "q_val_fissionproducts.csv",
        "q_val_light.csv",
    ]
    all_q_values = []
    for fname in q_value_files:
        all_q_values += grab_q_values(fname)
    # Make the q_value table and write to file
    print("Making q_value table...")
    make_q_value_table(all_q_values, nuc_data, build_dir)