Track dates of English school holidays

Fixes #168

agenda/holidays.py

@@ -7,6 +7,7 @@ import flask
 
 import agenda.uk_holiday
 import holidays
+from agenda.uk_school_holiday import school_holiday_list
 
 from .event import Event
 from .types import Holiday, Trip
@@ -29,6 +30,23 @@ def get_trip_holidays(trip: Trip) -> list[Holiday]:
     )
 
 
+def get_school_holidays(start_date: date, end_date: date, data_dir: str) -> list[Event]:
+    """Get UK school holidays from cache."""
+    return school_holiday_list(start_date, end_date, data_dir)
+
+
+def get_trip_school_holidays(trip: Trip) -> list[Event]:
+    """Get UK school holidays happening during trip."""
+    if not trip.end:
+        return []
+
+    return get_school_holidays(
+        trip.start,
+        trip.end,
+        flask.current_app.config["DATA_DIR"],
+    )
+
+
 def us_holidays(start_date: date, end_date: date) -> list[Holiday]:
     """Get US holidays."""
     found: list[Holiday] = []