Compose D&D location tracking modules

internal/modules/dnd/register/merge.go

@@ -152,6 +152,48 @@ func appendSceneDescriptionLists(values []dnd.SceneDescriptionList) (dnd.SceneDe
 	return combined, nil
 }
 
+func appendLocationLists(values []dnd.LocationList) (dnd.LocationList, error) {
+	count := 0
+	present := false
+	for _, value := range values {
+		if value.Locations != nil {
+			present = true
+		}
+		count += len(value.Locations)
+	}
+	if !present {
+		return dnd.LocationList{}, nil
+	}
+	combined := dnd.LocationList{Locations: make([]dnd.Location, 0, count)}
+	for _, value := range values {
+		for _, location := range value.Locations {
+			combined.Locations = append(combined.Locations, cloneLocation(location))
+		}
+	}
+	return combined, nil
+}
+
+func appendLocationOccurrenceLists(values []dnd.LocationOccurrenceList) (dnd.LocationOccurrenceList, error) {
+	count := 0
+	present := false
+	for _, value := range values {
+		if value.Occurrences != nil {
+			present = true
+		}
+		count += len(value.Occurrences)
+	}
+	if !present {
+		return dnd.LocationOccurrenceList{}, nil
+	}
+	combined := dnd.LocationOccurrenceList{Occurrences: make([]dnd.LocationOccurrence, 0, count)}
+	for _, value := range values {
+		for _, occurrence := range value.Occurrences {
+			combined.Occurrences = append(combined.Occurrences, cloneLocationOccurrence(occurrence))
+		}
+	}
+	return combined, nil
+}
+
 func cloneCombatTurn(value dnd.CombatTurn) dnd.CombatTurn {
 	clone := value
 	clone.SourceRefs = cloneSourceRefs(value.SourceRefs)
@@ -192,6 +234,18 @@ func cloneNPCInteraction(value dnd.NPCInteraction) dnd.NPCInteraction {
 	return clone
 }
 
+func cloneLocation(value dnd.Location) dnd.Location {
+	clone := value
+	clone.SourceRefs = cloneSourceRefs(value.SourceRefs)
+	return clone
+}
+
+func cloneLocationOccurrence(value dnd.LocationOccurrence) dnd.LocationOccurrence {
+	clone := value
+	clone.SourceRefs = cloneSourceRefs(value.SourceRefs)
+	return clone
+}
+
 func cloneSourceRefs(refs []source.SourceRef) []source.SourceRef {
 	return slices.Clone(refs)
 }