feat: improve logging

Sources/Commands/Run.swift

@@ -31,8 +31,6 @@ extension RunOn {
             let runner = ActionRunner(with: handler)
             let observer = EventObserver(activeSources)
             observer.listener = runner
-            let sourceNames = activeSources.map { source in source.name.cyan }
-            logger.info("observed sources: \(sourceNames.joined(separator: ", "))")
             observer.runLoop()
         }
     }

Sources/Events/EventLogger.swift

@@ -0,0 +1,24 @@
+struct EventLogger {
+	private let logger: Logger
+
+	init(with logger: Logger) {
+		self.logger = logger
+	}
+
+	func eventReceived(_ event: Event) {
+		self.logger.info("received event \(event.source.cyan):\(event.kind.blue) with \(event.target.yellow)")
+	}
+
+	func sourcesSubscribed(_ sources: [EventSource]) {
+		let names = sources
+			.map { source in source.name.cyan }
+			.joined(separator: ", ")
+		self.logger.info("subscribed to: \(names)")
+	}
+
+	func listenerIsNil() {
+		self.logger.error("event skipped, because listener is not set")
+	}
+}
+
+let kEventLogger = EventLogger(with: logger.child(prefix: "Events"))

Sources/Events/EventObserver.swift

@@ -13,17 +13,19 @@ class EventObserver: EventListener, EventProvider {
     }
 
     func handle(_ event: Event) {
+		kEventLogger.eventReceived(event)
         guard let listener else {
+			kEventLogger.listenerIsNil()
             return
         }
         listener.handle(event)
     }
 
     func subscribeSources() {
         for source in sources {
-            logger.debug("subscribing to \(source.name.cyan)")
             source.subscribe()
         }
+		kEventLogger.sourcesSubscribed(sources)
     }
 
     func runLoop() {

Sources/Runner/ActionLogger.swift

@@ -46,10 +46,6 @@ struct ActionRunnerLogger {
 			self.logger.error(String(describing: error))
 		}
 	}
-
-	func eventReceived(_ event: Event) {
-		self.logger.info("received event \(event.source.cyan):\(event.kind.blue) with \(event.target.yellow)")
-	}
 }
 
 let kActionLogger = ActionRunnerLogger(with: logger.child(prefix: "Runner"))

Sources/Runner/ActionRunner.swift

@@ -18,7 +18,6 @@ class ActionRunner: EventListener {
     }
 
     func handle(_ event: Event) {
-		kActionLogger.eventReceived(event)
         guard let action = handler.findAction(
             source: event.source,
             kind: event.kind,