🐛 Do not watch files that do not exist (#123)

phpmon-common/Core/Logger.swift

@@ -27,13 +27,13 @@ class Log {
     
     static func err(_ item: Any) {
         if Verbosity.error.isApplicable() {
-            print(item)
+            print("[ERR] \(item)")
         }
     }
     
     static func warn(_ item: Any) {
         if Verbosity.warning.isApplicable() {
-            print(item)
+            print("[WRN] \(item)")
         }
     }
     

phpmon/Domain/Watcher/PhpConfigWatcher.swift

@@ -47,6 +47,11 @@ class PhpConfigWatcher {
     }
     
     func addWatcher(for url: URL, eventMask: DispatchSource.FileSystemEvent, behaviour: FSWatcherBehaviour = .reloadsMenu) {
+        if !Filesystem.fileExists(url.path) {
+            Log.warn("No watcher was created for \(url.path) because the requested file does not exist.")
+            return
+        }
+        
         let watcher = FSWatcher(for: url, eventMask: eventMask, parent: self, behaviour: behaviour)
         self.watchers.append(watcher)
     }