Add savable Config class

Scripts/Configuration/Config.cs

@@ -0,0 +1,77 @@
+using System.Windows.Markup;
+using System.Xml.Linq;
+using Godot;
+
+namespace WacK.Configuration
+{
+	/// <summary>
+	/// A configurable variable that saves to user://settings.cfg.
+	/// </summary>
+	public class Config<[MustBeVariant] T>
+	{
+		// --- STATICALLY-TRACKED CONFIG FILE ---
+		private static ConfigFile cfgFile = new();
+		public static readonly string cfgPath = "user://settings.cfg";
+
+		// Metadata
+		string section, name;
+
+		// Callback
+		public delegate void OnValueSet();
+		private OnValueSet callback;
+
+		// Stored values
+		public T _default { get; private set; }
+		private T _value;
+		public T Value
+		{
+			get => _value;
+			set
+			{
+				_value = value;
+				Save();
+				if (callback != null) callback();
+			}
+		}
+
+		static Config()
+		{
+			var err = cfgFile.Load("user://settings.cfg");
+			if (err != Error.Ok)
+			{
+				GD.Print("Creating new settings file...");
+				cfgFile.Save("user://settings.cfg");
+			}
+		}
+
+		/// <summary>
+		/// 
+		/// </summary>
+		/// <param name="section">CANNOT have spaces.</param>
+		/// <param name="name">CANNOT contain spaces.</param>
+		/// <param name="defaultValue">The value to set if not found in the settings file.</param>
+		public Config(string section, string name, T defaultValue, OnValueSet callback = null)
+		{
+			this.section = section;
+			this.name = name;
+			_default = defaultValue;
+			this.callback = callback;
+			Fetch();
+		}
+		
+		private void Fetch()
+		{
+			if (!cfgFile.HasSectionKey(section, name))
+			{
+				cfgFile.SetValue(section, name, Variant.From(_default));
+				Save();
+			}
+			Value = cfgFile.GetValue(section, name).As<T>();
+		}
+
+		private void Save()
+		{
+			cfgFile.Save(cfgPath);
+		}
+	}
+}