def main():
args = get_args()
history = History(calc_ops)
if args.history_file_path:
with open(args.history_file_path) as history_file:
history.from_json(history_file.read())
command = "noop"
while command:
log_command(command)
command_fn = app_commands.get(command, command_unknown)
command_fn(history)
command = get_command()
