sbox-public/engine/Sandbox.Engine/Systems/Project/ProjectSettings/ProjectSettings.cs

using Sandbox.Audio;

namespace Sandbox;

public class ProjectSettings
{
	/// <summary>
	/// Get the <see cref="CollisionRules"/> from the active project settings.
	/// </summary>
	public static CollisionRules Collision => Get<CollisionRules>( "Collision.config" );

	/// <summary>
	/// Get the <see cref="Input"/> from the active project settings.
	/// </summary>
	public static InputSettings Input => Get<InputSettings>( "Input.config" );

	/// <summary>
	/// Get the <see cref="NetworkingSettings"/> from the active project settings.
	/// </summary>
	public static NetworkingSettings Networking => Get<NetworkingSettings>( "Networking.config" );

	/// <summary>
	/// Get the <see cref="MixerSettings"/> from the active project settings.
	/// </summary>
	internal static MixerSettings Mixer => Get<MixerSettings>( "Mixer.config" );

	/// <summary>
	/// Get the <see cref="CursorSettings"/> from the active project settings.
	/// </summary>
	internal static CursorSettings Cursor => Get<CursorSettings>( "Cursors.config" );

	/// <summary>
	/// Get the <see cref="PhysicsSettings"/> from the active project settings.
	/// </summary>
	public static PhysicsSettings Physics => Get<PhysicsSettings>( "Physics.config" );

	/// <summary>
	/// Get the <see cref="SystemsConfig"/> from the active project settings.
	/// </summary>
	public static SystemsConfig Systems => Get<SystemsConfig>( "Systems.config" );

	/// <summary>
	/// Reset any stored references to Project Settings.
	/// </summary>
	internal static void ClearCache()
	{
		_cache.Clear();
	}

	static Dictionary<string, ConfigData> _cache = new();

	/// <summary>
	/// Gets or creates a default version of this config data. You can safely call this multiple times
	/// and it will return the same object. The cache is cleared automatically when the project changes, 
	/// or when it's hotloaded.
	/// </summary>
	public static T Get<T>( string filename ) where T : ConfigData, new()
	{
		if ( _cache.TryGetValue( filename, out var result ) && result is T t )
			return t;

		var txt = EngineFileSystem.ProjectSettings?.ReadAllText( BaseFileSystem.NormalizeFilename( filename ) );
		var config = new T();
		_cache[filename] = config;

		if ( !string.IsNullOrEmpty( txt ) )
		{
			config.Deserialize( txt );
		}

		return config;
	}
}