feat: adeded timer_screen and custom_timer, timer_screen connected in the main.py

kawai_focus/utils.py

@@ -0,0 +1,36 @@
+import time
+import re
+from typing import Generator
+import logging
+
+from kivy.logger import Logger
+
+
+Logger.setLevel(logging.DEBUG)
+
+
+def custom_timer(timer_str: str) -> Generator[str, None, None]:
+    """Функция отсчитывает время, установленное для таймера в формате 'XhYmZs'."""
+    
+    try:
+        match = re.match(r'(?:(\d+)h)?(?:(\d+)m)?(?:(\d+)s)?', timer_str)
+        if not match:
+            raise ValueError('Неверный формат времени, используйте "XhYmZs"!')
+
+        hours, minutes, seconds = match.groups()
+        total_seconds = (int(hours or 0) * 3600) + (int(minutes or 0) * 60) + (int(seconds or 0))
+        
+        if total_seconds == 0:
+            raise ValueError('Не указано время таймера!')
+
+        for remaining in range(total_seconds, -1, -1):
+            yield f"{remaining // 3600:02d}:{(remaining % 3600) // 60:02d}:{remaining % 60:02d}"
+    except ValueError as err:
+        Logger.error(f'{err.__class__.__name__}: {err}')
+
+
+if __name__ == '__main__':
+    # Пример использования
+    
+    for time_now in custom_timer('0h1m3s'):
+        print(time_now)