impove core readability and hadnling of dock positions

DockPhobia/MouseTracker.swift

@@ -87,19 +87,18 @@ class MouseTracker {
 		}
 		self.currentDockSide = .bottom
 		moveDock(.bottom)
-		start()
 	}
 	
 	func checkMouse(_ event: NSEvent) {
 		var location = event.locationInWindow
 		location.y = screen.height - location.y
-		#if DEBUG
+#if DEBUG
 		print(location)
-		#endif
+#endif
 		
 		switch currentDockSide {
 		case .left:
-			if location.x < 100 {
+			guard location.x < 100 else { return }
 			if location.y < screen.height/2 {
 				moveDock(.bottom)
 				return
@@ -107,9 +106,8 @@ class MouseTracker {
 				moveDock(.right)
 				return
 			}
-			}
 		case .bottom:
-			if location.y > 1000 {
+			guard location.y > 1000 else { return }
 			if location.x < screen.width/2 {
 				moveDock(.right)
 				return
@@ -117,9 +115,8 @@ class MouseTracker {
 				moveDock(.left)
 				return
 			}
-			}
 		case .right:
-			if location.x > 1600 {
+			guard location.x > 1600 else { return }
 			if location.y < screen.height/2 {
 				moveDock(.bottom)
 				return
@@ -129,7 +126,6 @@ class MouseTracker {
 			}
 		}
 	}
-	}
 	
 	func start() {
 		self.monitor = NSEvent.addGlobalMonitorForEvents(matching: .mouseMoved, handler: checkMouse)