terminal-emulator/terminal/__main__.py

import keyboard
import time
import os


def put_cursor(line, col):
    return f'\033[{int(line)};{int(col)}f'


class Menu:
    def __init__(self, start_line):
        self.start_line = start_line
        self.options = [
            'test 1',
            'test 2',
            'test 3'
        ]
        self.selected = 0
        self.highlight = '\033[2;30;42m'
        self.regular = '\033[1;32m'

    def next(self):
        self.selected += 1
        if self.selected > len(self.options) - 1:
            self.selected = 0

    def prev(self):
        self.selected -= 1
        if self.selected < 0:
            self.selected = len(self.options) - 1

    def draw(self):
        term_size = os.get_terminal_size()
        current_line = self.start_line

        for i, option in enumerate(self.options):
            print(f'{put_cursor(self.start_line + i, 0)}\033[2;0;0m', end='')
            print(' ' * term_size.columns, end='\r')
            if i == self.selected:
                print(f'{self.highlight}{option}')
            else:
                print(f'{self.regular}{option}')



def main():
    selected_item = 0
    menu = Menu(10)
    menu.draw()
    while True:
        pressed_key = keyboard.read_event()
        if pressed_key.event_type == 'down':
            if pressed_key.name == 'j':
                menu.next()
            elif pressed_key.name == 'k':
                menu.prev()
        menu.draw()


if __name__ == '__main__':
    main()