Fix _sdl_event_watcher cdef

Type did not match the function def demanded by SDL for event watching and was crashing Add tests to ensure that this function works

Author: HexDecimal

CHANGELOG.md

@@ -6,6 +6,10 @@ This project adheres to [Semantic Versioning](https://semver.org/) since version
 
 ## [Unreleased]
 
+### Fixed
+
+- `tcod.event.add_watch` was crashing due to a cdef type mismatch.
+
 ## [19.6.0] - 2025-10-20
 
 ### Added

build_sdl.py

@@ -311,7 +311,7 @@ def get_emscripten_include_dir() -> Path:
 // SDL to Python log function.
 void _sdl_log_output_function(void *userdata, int category, SDL_LogPriority priority, const char *message);
 // Generic event watcher callback.
-int _sdl_event_watcher(void* userdata, SDL_Event* event);
+bool _sdl_event_watcher(void* userdata, SDL_Event* event);
 }
 """
 

tests/test_tcod.py

@@ -204,3 +204,16 @@ def test_context(uses_window: None) -> None: # noqa: ARG001
  context.pixel_to_subtile(0, 0)
  with pytest.raises(RuntimeError, match=r".*context has been closed"):
  context.present(console)
+
+
+def test_event_watch() -> None:
+ def handle_events(_event: tcod.event.Event) -> None:
+ pass
+
+ tcod.event.add_watch(handle_events)
+ with pytest.warns(RuntimeWarning, match=r"nothing was added"):
+ tcod.event.add_watch(handle_events)
+
+ tcod.event.remove_watch(handle_events)
+ with pytest.warns(RuntimeWarning, match=r"nothing was removed"):
+ tcod.event.remove_watch(handle_events)