move the event loop to a main() function

buttond.py

@@ -28,6 +28,16 @@ from gpiozero import Button, GPIODeviceError
 logging.basicConfig(level=logging.INFO)
 log = logging.getLogger(__name__)
 
+
+def main():
+    """Entry point for direct execution."""
+    ## run the event loop
+    try:
+        pause()
+    except KeyboardInterrupt:
+        print()
+
+
 def activate(macro):
     """Sanitize user configured macros."""
     if macro is None:
@@ -79,10 +89,7 @@ except NameError as e:
 
 # when run directly, sleep until button signal or KeyboardInterrupt
 if __name__ == '__main__':
-    try:
-        pause()
-    except KeyboardInterrupt:
-        print()
+    main()
 else:
     # indicate prefered method of sleeping when laoded as a module
     log.debug('call signal.pause() instead of time.sleep()')