actually now its usable

heh/Utils/ProperPersistent.cs

@@ -0,0 +1,84 @@
+using System.ComponentModel;
+using System.IO;
+using System.Text;
+using System.Xml;
+using System.Xml.Serialization;
+using NLog;
+using Torch;
+namespace heh.Utils;
+
+/// <summary>
+/// Simple class that manages saving <see cref="Persistent{T}.Data"/> to disk using XML serialization.
+/// Will automatically save on changes in the data class.
+/// </summary>
+/// <typeparam name="TViewModel">Data class type</typeparam>
+public sealed class ProperPersistent<TViewModel> : IDisposable where TViewModel : class, INotifyPropertyChanged, new()
+{
+    private static readonly XmlSerializer Serializer = new(typeof(TViewModel));
+    private static readonly ILogger Log = LogManager.GetLogger($"ProperPersistent_{typeof(TViewModel)}");
+
+    private readonly ChangeListener _listener;
+    private Timer? _saveConfigTimer;
+    
+    public TViewModel Data { get; }
+    public string Path { get; set; }
+    
+    public ProperPersistent(string path, TViewModel? defaultViewModel = default)
+    {
+        Path = path;
+        if (File.Exists(path))
+        {
+            try
+            {
+                using var stream = File.OpenRead(path);
+                Data = (TViewModel) Serializer.Deserialize(stream);
+            }
+            catch (Exception e)
+            {
+                Log.Error(e);
+                Data = defaultViewModel ?? new TViewModel();
+            }
+        }
+        else
+        {
+            Data = defaultViewModel ?? new TViewModel();
+            Save();
+        }
+
+        _listener = ChangeListener.Create(Data)!;
+        _listener.PropertyChanged += ListenerOnPropertyChanged;
+    }
+    private void ListenerOnPropertyChanged(object sender, PropertyChangedEventArgs e)
+    {
+        SaveAsync();
+    }
+
+    private void SaveAsync()
+    {
+        _saveConfigTimer ??= new(_ => Save());
+        _saveConfigTimer.Change(1000, -1);
+    }
+    public void Dispose()
+    {
+        _listener.Dispose();
+        _saveConfigTimer?.Dispose();
+        _saveConfigTimer = null;
+    }
+#region Backwards compatibility
+    public void Save(string? newPath = null)
+    {
+        if (newPath is not null)
+            Path = newPath;
+        
+        using var stream = File.Create(Path);
+        using var writer = new XmlTextWriter(stream, Encoding.UTF8)
+        {
+            Formatting = Formatting.Indented
+        };
+        
+        Serializer.Serialize(writer, Data);
+    }
+
+    public static ProperPersistent<TViewModel> Load(string path, bool saveIfNew = true) => new(path);
+#endregion
+}