2 files changed, 70 insertions, 0 deletions
diff --git a/internal/validate/checks.go b/internal/validate/checks.go
index 6aa0a81..197b8d3 100644
--- a/internal/validate/checks.go
+++ b/internal/validate/checks.go
@@ -521,6 +521,74 @@ func validateCourses(s Source) []Issue {
 	return issues
 }
 
+func validateRoomTriggers(s Source) []Issue {
+	var issues []Issue
+	roomIndex := s.World.RoomIndex()
+	itemIDs := s.Items.IDSet()
+	mobIDs := s.Mobs.AllDefIDs()
+
+	for id := range roomIndex {
+		room, err := s.World.LoadRoom(id)
+		if err != nil || len(room.Triggers) == 0 {
+			continue
+		}
+		for ti, trigger := range room.Triggers {
+			prefix := fmt.Sprintf("Room %d: trigger[%d]", id, ti)
+			for si, step := range trigger.Steps {
+				stepPrefix := fmt.Sprintf("%s: step[%d]", prefix, si)
+				if step.SpawnMob != nil && step.SpawnMob.ID != "" {
+					if _, ok := mobIDs[step.SpawnMob.ID]; !ok {
+						issues = append(issues, Issue{
+							Level: "ERROR",
+							Type:  "reference",
+							Message: fmt.Sprintf("%s: spawn_mob %q does not exist",
+								stepPrefix, step.SpawnMob.ID),
+						})
+					}
+					for _, wr := range step.SpawnMob.DespawnRooms {
+						if _, ok := roomIndex[wr]; !ok {
+							issues = append(issues, Issue{
+								Level: "ERROR",
+								Type:  "reference",
+								Message: fmt.Sprintf("%s: spawn_mob despawn_rooms references nonexistent room %d",
+									stepPrefix, wr),
+							})
+						}
+					}
+				}
+				if step.GiveItem != "" && !itemIDs[step.GiveItem] {
+					issues = append(issues, Issue{
+						Level: "ERROR",
+						Type:  "reference",
+						Message: fmt.Sprintf("%s: give_item %q does not exist",
+							stepPrefix, step.GiveItem),
+					})
+				}
+				if step.TakeItem != "" && !itemIDs[step.TakeItem] {
+					issues = append(issues, Issue{
+						Level: "ERROR",
+						Type:  "reference",
+						Message: fmt.Sprintf("%s: take_item %q does not exist",
+							stepPrefix, step.TakeItem),
+					})
+				}
+				if step.Teleport > 0 {
+					if _, ok := roomIndex[step.Teleport]; !ok {
+						issues = append(issues, Issue{
+							Level: "ERROR",
+							Type:  "reference",
+							Message: fmt.Sprintf("%s: teleport to nonexistent room %d",
+								stepPrefix, step.Teleport),
+						})
+					}
+				}
+			}
+		}
+	}
+
+	return issues
+}
+
 func validateRoomWiring(s Source) []Issue {
 	var issues []Issue
 	roomIndex := s.World.RoomIndex()
diff --git a/internal/validate/validate.go b/internal/validate/validate.go
index 5557f72..3918c95 100644
--- a/internal/validate/validate.go
+++ b/internal/validate/validate.go
@@ -63,6 +63,7 @@ func Run(s Source) []Issue {
 		{"items", "item"}, {"rooms", "room"}, {"mobs", "mob"},
 		{"objects", "object"}, {"drops", "drop table"}, {"courses", "course"},
 		{"modules", "module"}, {"techs", "tech"}, {"help", "help topic"},
+		{"triggers", "trigger"},
 	} {
 		issues = append(issues, validateIDs(s.DataDir, dir.sub, dir.label)...)
 	}
@@ -75,6 +76,7 @@ func Run(s Source) []Issue {
 	issues = append(issues, validateCraftBlocks(s)...)
 	issues = append(issues, validateDropTables(s)...)
 	issues = append(issues, validateCourses(s)...)
+	issues = append(issues, validateRoomTriggers(s)...)
 	issues = append(issues, validateTechs(s)...)
 	issues = append(issues, validateRoomWiring(s)...)