Let the user choose a raw dataset. Return the absolute path.

def choose_raw_dataset(currently=""):
    """Let the user choose a raw dataset. Return the absolute path."""
    folder = os.path.join(get_project_root(), "raw-datasets")
    files = [os.path.join(folder, name) for name in os.listdir(folder)
             if name.endswith(".pickle")]
    default = -1
    for i, filename in enumerate(files):
        if os.path.basename(currently) == os.path.basename(filename):
            default = i
        if i != default:
            print("[%i]\t%s" % (i, os.path.basename(filename)))
        else:
            print("\033[1m[%i]\033[0m\t%s" % (i, os.path.basename(filename)))
    i = input_int_default("Choose a dataset by number: ", default)
    return files[i]