add trigger event idea.

bus.go

@@ -11,6 +11,14 @@ type Event interface {
 	EventDescription() string
 }
 
+// A TriggerEvent is a catch-all for events that may trigger a command from the event handler.
+type TriggerEvent interface {
+	Event
+
+	TriggerKind() string
+	TriggerValue(key string) (string, bool)
+}
+
 type Command interface {
 	CommandDescription() string
 }

cmd/bustest/main.go

@@ -61,6 +61,17 @@ func main() {
 		SceneID: 7,
 	})
 
+	bus.RunEvent(events.ExternalEvent{
+		Kind: "weather",
+		Values: map[string]string{
+			"city":                "Ørland",
+			"region":              "Trøndelag",
+			"country":             "Norway",
+			"temperature_celsius": "21.00",
+			"precipitation_mm":    "3.21",
+		},
+	})
+
 	time.Sleep(time.Second / 8)
 
 	log.Println("Search \"**:Hexagon {1,5,6}\"")

events/external.go

@@ -0,0 +1,21 @@
+package events
+
+import "fmt"
+
+type ExternalEvent struct {
+	Kind   string
+	Values map[string]string
+}
+
+func (e ExternalEvent) EventDescription() string {
+	return fmt.Sprintf("External(kind:%s, values:%v)", e.Kind, e.Values)
+}
+
+func (e ExternalEvent) TriggerKind() string {
+	return fmt.Sprintf("external.%s", e.Kind)
+}
+
+func (e ExternalEvent) TriggerValue(key string) (string, bool) {
+	v, ok := e.Values[key]
+	return v, ok
+}