chore: add timer example

Author: gusye1234

drive_events/dynamic.py

@@ -6,7 +6,9 @@
 )
 
 
-def goto_events(group_markers: list[BaseEvent], any_return: Any) -> _SpecialEventReturn:
+def goto_events(
+    group_markers: list[BaseEvent], any_return: Any = None
+) -> _SpecialEventReturn:
     return _SpecialEventReturn(
         behavior=ReturnBehavior.GOTO, returns=(group_markers, any_return)
     )

examples/4_endless_tick_timer.py

@@ -1 +1,19 @@
-# TODO
+import asyncio
+from datetime import datetime
+from drive_events import default_drive, EventInput
+from drive_events.dynamic import goto_events
+
+
+@default_drive.make_event
+async def tick(event: EventInput, global_ctx):
+    await asyncio.sleep(1)
+    return "tick"
+
+
+@default_drive.listen_groups([tick])
+async def tok(event: EventInput, global_ctx):
+    print(datetime.now(), f"{event.results[tick.id]}, then tok")
+    return goto_events([tick])
+
+
+asyncio.run(default_drive.invoke_event(tick))