A simple yet effective command-line application that implements the 20-20-20 rule for reducing eye strain while working on computers. The rule suggests that every 20 minutes, you should look at something 20 feet away for 20 seconds.

eye_care.py

import time
import datetime
import os
import platform

def clear_screen():
    os.system('cls' if platform.system() == 'Windows' else 'clear')

def play_sound(repeat=10):
    for _ in range(repeat):
        time.sleep(0.250)

        if platform.system() == 'Windows':
            import winsound
            winsound.Beep(1000, 1000)  # Frequency: 1000Hz, Duration: 1000ms
        else:
            os.system('echo -e "\a"')  # Print ASCII bell character

def get_next_reminder_time():
    now = datetime.datetime.now()
    minutes = now.minute
    next_20_min = (minutes // 20 + 1) * 20
    if next_20_min == 60:
        next_reminder = now.replace(hour=now.hour+1, minute=0, second=0, microsecond=0)
    else:
        next_reminder = now.replace(minute=next_20_min, second=0, microsecond=0)
    return next_reminder

def main():
    print("Eye Care Reminder CLI")
    print("Press Ctrl+C to exit")

    while True:
        next_reminder = get_next_reminder_time()

        while datetime.datetime.now() < next_reminder:
            clear_screen()
            time_left = next_reminder - datetime.datetime.now()
            print(f"Next eye break at: {next_reminder.strftime('%H:%M:%S')}")
            print(f"Time until next break: {time_left.seconds // 60:02d}:{time_left.seconds % 60:02d}")
            time.sleep(1)

        clear_screen()
        print("Time for an eye break!")
        print("Look at something 20 feet away for 20 seconds.")
        play_sound()

        for i in range(20, 0, -1):
            print(f"Break time remaining: {i} seconds", end='\r')
            time.sleep(1)

        print("\nBreak finished. Keep up the good work!")
        time.sleep(3)

if __name__ == "__main__":
    try:
        main()
    except KeyboardInterrupt:
        print("\nEye Care Reminder CLI closed. Take care of your eyes!")