feat: make alarm music file configurable via env var and CLI arg

wecker.py

@@ -63,8 +63,14 @@ BUTTON_PIN = 17
 LED_PIN = 27
 
 
-def setup():
+DEFAULT_MUSIC_FILE = "Laid Back - Sunshine Reggae.mp3"
+
+
+def setup(music_file: str | None = None):
     """Initialize GPIO and audio hardware. Call once before running."""
+    if music_file is None:
+        music_file = os.environ.get("MUSIC_FILE", DEFAULT_MUSIC_FILE)
+
     GPIO.setmode(GPIO.BCM)
     GPIO.setup(LED_PIN, GPIO.OUT)
     GPIO.setup(BUTTON_PIN, GPIO.IN, pull_up_down=GPIO.PUD_UP)
@@ -74,7 +80,7 @@ def setup():
     pygame.mixer.init()
 
     try:
-        pygame.mixer.music.load("Laid Back - Sunshine Reggae.mp3")
+        pygame.mixer.music.load(music_file)
         pygame.mixer.music.set_volume(1.0)
     except Exception as e:
         logging.error(f"Error loading audio file: {e}")
@@ -200,8 +206,8 @@ class AlarmClock:
         return True  # Keep running
 
 
-def run_alarm(test_mode=False):
-    setup()
+def run_alarm(test_mode=False, music_file: str | None = None):
+    setup(music_file=music_file)
     logging.info("Alarm clock started. Music is playing in an endless loop.")
     if "pygame" in globals() and hasattr(pygame, "mixer") and pygame.mixer.get_init():
         pygame.mixer.music.play(-1)
@@ -231,9 +237,19 @@ def run_alarm(test_mode=False):
 
 
 if __name__ == "__main__":
+    import argparse
+
+    parser = argparse.ArgumentParser(description="Raspberry Pi alarm clock.")
+    parser.add_argument(
+        "--music-file",
+        default=os.environ.get("MUSIC_FILE", DEFAULT_MUSIC_FILE),
+        help="Path to the MP3 file to play (default: $MUSIC_FILE or default track).",
+    )
+    args = parser.parse_args()
+
     ensure_single_instance()
     try:
-        run_alarm()
+        run_alarm(music_file=args.music_file)
     finally:
         pygame.mixer.quit()
         GPIO.cleanup()