feat: add NuGet and Godot distribution

Godot~/ShrinkGodotModLoader.cs

@@ -0,0 +1,66 @@
+#nullable enable
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using System.Runtime.Loader;
+
+namespace ShrinkModFramework.Godot;
+
+public sealed class ShrinkGodotModLoader : IDisposable
+{
+    private sealed record LoadedMod(AssemblyLoadContext LoadContext, WeakReference UnloadReference,
+        ShrinkModContext Context, IReadOnlyList<IShrinkMod> Instances);
+    private readonly Dictionary<string, LoadedMod> _loaded = new(StringComparer.OrdinalIgnoreCase);
+
+    public IReadOnlyCollection<string> LoadedAssemblyPaths => _loaded.Keys;
+
+    public IReadOnlyList<IShrinkMod> Load(string assemblyPath)
+    {
+        assemblyPath = Path.GetFullPath(assemblyPath);
+        if (_loaded.ContainsKey(assemblyPath)) throw new InvalidOperationException($"Mod assembly is already loaded: {assemblyPath}");
+        var loadContext = new AssemblyLoadContext($"ShrinkMod:{Path.GetFileNameWithoutExtension(assemblyPath)}", true);
+        loadContext.Resolving += (_, name) => ResolveDependency(loadContext, Path.GetDirectoryName(assemblyPath)!, name);
+        try
+        {
+            var assembly = loadContext.LoadFromAssemblyPath(assemblyPath);
+            var entries = assembly.GetTypes().Where(type => !type.IsAbstract && typeof(IShrinkMod).IsAssignableFrom(type) &&
+                type.GetCustomAttribute<ShrinkModAttribute>() != null).OrderBy(type => type.GetCustomAttribute<ShrinkModAttribute>()!.LoadOrder).ToArray();
+            var context = new ShrinkModContext(Path.GetDirectoryName(assemblyPath)!);
+            var instances = entries.Select(type => (IShrinkMod)(Activator.CreateInstance(type) ??
+                throw new InvalidOperationException($"Failed to create mod entry: {type.FullName}"))).ToArray();
+            foreach (var mod in instances) mod.OnConstruct(context);
+            foreach (var mod in instances) mod.OnRegisterContent(context);
+            foreach (var mod in instances) mod.OnInitialize(context);
+            foreach (var mod in instances) mod.OnReady(context);
+            _loaded[assemblyPath] = new LoadedMod(loadContext, new WeakReference(loadContext), context, instances);
+            return instances;
+        }
+        catch { loadContext.Unload(); throw; }
+    }
+
+    public bool Unload(string assemblyPath)
+    {
+        assemblyPath = Path.GetFullPath(assemblyPath);
+        if (!_loaded.Remove(assemblyPath, out var loaded)) return false;
+        for (var index = loaded.Instances.Count - 1; index >= 0; index--)
+            if (loaded.Instances[index] is IShrinkModUnload unload) unload.OnUnload(loaded.Context);
+        loaded.LoadContext.Unload();
+        return true;
+    }
+
+    public void Dispose()
+    {
+        foreach (var path in _loaded.Keys.ToArray()) Unload(path);
+    }
+
+    private static Assembly? ResolveDependency(AssemblyLoadContext context, string directory, AssemblyName name)
+    {
+        var shared = AssemblyLoadContext.Default.Assemblies.FirstOrDefault(assembly => assembly.GetName().Name == name.Name);
+        if (shared != null) return shared;
+        var path = Path.Combine(directory, name.Name + ".dll");
+        return File.Exists(path) ? context.LoadFromAssemblyPath(path) : null;
+    }
+}

Godot~/ShrinkSDK.ModFramework.Godot.csproj

@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <AssemblyName>ShrinkModFramework.Godot</AssemblyName>
+    <RootNamespace>ShrinkModFramework.Godot</RootNamespace>
+    <PackageId>ShrinkSDK.ModFramework.Godot</PackageId>
+    <Version>0.1.0</Version>
+    <Description>Collectible AssemblyLoadContext host for ShrinkSDK mods in Godot.</Description>
+    <ShrinkCodeGenEnabled>false</ShrinkCodeGenEnabled>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\DotNet~\ShrinkSDK.ModFramework.csproj" />
+    <PackageReference Include="ShrinkSDK.Godot" Version="0.1.0" />
+  </ItemGroup>
+</Project>