Add interrupt handler and finishing logic

autopon.py

@@ -92,6 +92,7 @@ def main():
     synctime = time.perf_counter() + startup_delay
 
     # Play da notes
+    try:
         while remaining_iterations > 0:
             for i, key in enumerate(sequence):
                 while time.perf_counter() < synctime + lastbeat:
@@ -105,5 +106,10 @@ def main():
                     print(" ", end="", flush=True)
             remaining_iterations -= 1
             print(f"~ ({remaining_iterations} remaining)")
+    except KeyboardInterrupt as e:
+        pass
+
+    print(f"Total iterations: {args.iterations - remaining_iterations}")
+    return 0
 
 main()