advanced-python-homework-2023/turtle/noblocking_turtle_shell.py

import cmd
import threading

from queue import Queue

from equipment.turtle_device import TurtleDevice


class TurtleDeviceThread(threading.Thread):
    # TODO(Homework 4)
    def __init__(self):
        super().__init__()
        self.device = TurtleDevice()

        self.queue = Queue[tuple]()

        self.device.open()
        self.device.execute("speed", 1)

    def run(self):
        while True:
            action, args, kwargs = self.queue.get()
            if action == "exit":
                self.queue.task_done()
                break
            self.device.execute(action, *args, **kwargs)
            self.queue.task_done()

    def add_task(self, action, *args, **kwargs):
        self.queue.put((action, args, kwargs))


class NoBlockingTurtleShell(cmd.Cmd):
    intro = "Welcome to the turtle shell.   Type help or ? to list commands.\n"
    prompt = "(turtle) "
    file = None

    def __init__(self, turtle_thread: TurtleDeviceThread):
        super().__init__()
        self.turtle_thread = turtle_thread

    @property
    def turtle_device(self):
        return self.turtle_thread.device

    def do_execute(self, arg):
        command_and_args = arg.split()
        if len(command_and_args) == 1:
            self.turtle_thread.add_task(command)
            return
        command = command_and_args[0]
        args = tuple(int(c) if c.isdecimal() else c for c in command_and_args[1:])
        self.turtle_thread.add_task(command, *args)

    def do_fw(self, arg):
        self.do_execute("forward 100")

    def do_le(self, arg):
        self.do_execute("left 1000")

    def do_exit(self, arg):
        self.turtle_thread.add_task("exit")
        return True


if __name__ == "__main__":
    turtle_thread = TurtleDeviceThread()
    # TODO(Homework 4: Correct start thread)
    turtle_thread.daemon = True
    thread_shell = threading.Thread(target=NoBlockingTurtleShell(turtle_thread).cmdloop)
    thread_shell.start()
    turtle_thread.run()
    thread_shell.join()