0.1-beta

.gitignore

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+/.idea/
+
+### Godot ###
+
+# Godot-specific ignores
+.import/
+export.cfg
+export_presets.cfg
+
+# Imported translations (automatically generated from CSV files)
+*.translation
+
+# Mono-specific ignores
+.mono/
+data_*/
+
+### Csharp ###
+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+##
+## Get latest from https://github.com/github/gitignore/blob/master/VisualStudio.gitignore
+
+# User-specific files
+*.rsuser
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+*.userprefs
+
+# Mono auto generated files
+mono_crash.*
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+[Ww][Ii][Nn]32/
+[Aa][Rr][Mm]/
+[Aa][Rr][Mm]64/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+[Ll]ogs/
+

Decembrist Plugin.csproj

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+<Project Sdk="Godot.NET.Sdk/3.2.3">
+  <PropertyGroup>
+    <LangVersion>8</LangVersion>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <RootNamespace>Decembrist</RootNamespace>
+  </PropertyGroup>
+</Project>

Decembrist Plugin.csproj.DotSettings

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+<wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
+	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=addons/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=addons_005Cdecembrist_005Fplugin/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=addons_005Cspring_005Fframework/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>

Decembrist Plugin.sln

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+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 2012
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Decembrist Plugin", "Decembrist Plugin.csproj", "{009F4AE3-B7A3-406D-8521-76DE42F276CC}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+	Debug|Any CPU = Debug|Any CPU
+	ExportDebug|Any CPU = ExportDebug|Any CPU
+	ExportRelease|Any CPU = ExportRelease|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{009F4AE3-B7A3-406D-8521-76DE42F276CC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{009F4AE3-B7A3-406D-8521-76DE42F276CC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{009F4AE3-B7A3-406D-8521-76DE42F276CC}.ExportDebug|Any CPU.ActiveCfg = ExportDebug|Any CPU
+		{009F4AE3-B7A3-406D-8521-76DE42F276CC}.ExportDebug|Any CPU.Build.0 = ExportDebug|Any CPU
+		{009F4AE3-B7A3-406D-8521-76DE42F276CC}.ExportRelease|Any CPU.ActiveCfg = ExportRelease|Any CPU
+		{009F4AE3-B7A3-406D-8521-76DE42F276CC}.ExportRelease|Any CPU.Build.0 = ExportRelease|Any CPU
+	EndGlobalSection
+EndGlobal

Example/DecembristConfiguration.cs

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+using Decembrist.Di;
+using Decembrist.Example.Service;
+
+namespace Decembrist.Example
+{
+    public class DecembristConfiguration: IDecembristConfiguration
+    {
+        public ContainerBuilder ConfigDi(ContainerBuilder builder)
+        {
+            builder.Register<SomeService2, IService>();
+            builder.Register<SomeService1>();
+            return builder;
+        }
+    }
+}

Example/Service/IService.cs

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+namespace Decembrist.Example.Service
+{
+    public interface IService
+    {
+        public void Run();
+    }
+}

Example/Service/SomeService1.cs

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+using Godot;
+
+namespace Decembrist.Example.Service
+{
+    public class SomeService1
+    {
+        public void SayHello() => GD.Print("Hello");
+    }
+}

Example/Service/SomeService2.cs

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+namespace Decembrist.Example.Service
+{
+    public class SomeService2: IService
+    {
+        private readonly SomeService1 _service1;
+
+        public SomeService2(SomeService1 service1)
+        {
+            _service1 = service1;
+        }
+
+        public void Run() => _service1.SayHello();
+    }
+}

Example/TestScene.cs

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+using Godot;
+using Decembrist.Di;
+using Decembrist.Example.Service;
+using Decembrist.Utils;
+
+namespace Decembrist.Example
+{
+    public class TestScene : Node2D
+    {
+        [Inject]
+        private IService service;
+
+        public override void _Ready()
+        {
+            this.InjectAll();
+            service.Run();
+        }
+
+    }
+}

Example/TestScene.tscn

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+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://Example/TestScene.cs" type="Script" id=1]
+
+[node name="Node2D" type="Node2D"]
+script = ExtResource( 1 )

addons/decembrist_plugin/Autoload/DiService.cs

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+#nullable enable
+using System;
+using System.Reflection;
+using Godot;
+using Decembrist.Di;
+using Decembrist.Service;
+using DiContainer = Decembrist.Di.Container;
+
+namespace Decembrist.Autoload
+{
+    public class DiService : Node2D
+    {
+        public DiContainer Container;
+
+        public override void _Ready()
+        {
+        }
+
+        public DiService()
+        {
+            var builder = new ContainerBuilder();
+            builder.RegisterInstance(new ConfigService());
+            builder = InstantiateConfig()?.ConfigDi(builder) ?? builder;
+            Container = builder.Build();
+        }
+
+        public T? ResolveOrNull<T>() where T : class
+        {
+            return Container.ResolveOrNull(typeof(T)) as T;
+        }
+
+        public void InjectAll(object instance)
+        {
+            var type = instance.GetType();
+            var fields = type.GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
+            foreach (var field in fields)
+            {
+                if (field.GetCustomAttribute(typeof(Inject)) != null)
+                {
+                    var serviceType = field.FieldType;
+                    var service = Container.ResolveOrNull(serviceType);
+                    if (service != null)
+                    {
+                        field.SetValue(instance, service);
+                    }
+                    else
+                    {
+                        GD.PrintErr($"No such type registered in container: {serviceType} for class {type}");
+                    }
+                }
+            }
+        }
+
+        private IDecembristConfiguration? InstantiateConfig()
+        {
+            if (!(ProjectSettings.GetSetting("decembrist/config_class") is string configClass))
+            {
+                return null;
+            }
+            var configType = Type.GetType(configClass);
+            if (configType == null)
+            {
+                return null;
+            }
+
+            var noArgConstructor = configType?.GetConstructor(new Type[0]);
+            var config = noArgConstructor?.Invoke(null) ??
+                         throw new Exception($"Decembrist config {configType} has no default constructor");
+            if (config is IDecembristConfiguration decembristConfiguration)
+            {
+                return decembristConfiguration;
+            }
+
+            return null;
+        }
+    }
+}

addons/decembrist_plugin/DecembristPlugin.cs

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+#if TOOLS
+using Godot;
+
+[Tool]
+public class DecembristPlugin : EditorPlugin
+{
+    public override void EnablePlugin()
+    {
+        AddAutoloadSingleton("DI", "res://addons/decembrist_plugin/Autoload/DiService.cs");
+        CheckSetting("decembrist/config_class", "DecembristConfiguration");
+    }
+
+    public override void DisablePlugin()
+    {
+        RemoveAutoloadSingleton("DI");
+    }
+
+    private void CheckSetting(string name, object @default)
+    {
+        var setting = ProjectSettings.GetSetting(name);
+        if (setting == null)
+        {
+            ProjectSettings.SetSetting(name, @default);
+        }
+    }
+}
+
+#endif

addons/decembrist_plugin/Di/Container.cs

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+#nullable enable
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using Decembrist.Service;
+
+namespace Decembrist.Di
+{
+    public class Container
+    {
+        private readonly Dictionary<Type, object> _instanceMap;
+
+        public Container(Dictionary<Type, object> instanceMap, Dictionary<Type, Type> typeMap)
+        {
+            _instanceMap = instanceMap;
+            InstantiateTypes(typeMap);
+        }
+
+        public object? ResolveOrNull(Type type)
+        {
+            return _instanceMap.ContainsKey(type) ? _instanceMap[type] : null;
+        }
+
+        private void InstantiateTypes(Dictionary<Type, Type> typeMap)
+        {
+            var iteration = typeMap.Count;
+            while (typeMap.Count > 0 && iteration == typeMap.Count)
+            {
+                var toRemove = new List<Type>();
+                foreach (var (type, asType) in typeMap)
+                {
+                    // Instantiate through no arg constructor  
+                    var instance = type.GetConstructor(new Type[0])?.Invoke(null);
+                    if (instance == null)
+                    {
+                        var ctr = type.GetConstructors().First();
+                        instance = InstantiateTypes(ctr);
+                    }
+
+                    if (instance != null)
+                    {
+                        _instanceMap[asType] = instance;
+                        toRemove.Add(type);
+                    }
+                }
+                foreach (var type in toRemove)
+                {
+                    typeMap.Remove(type);
+                }
+
+                iteration--;
+            }
+
+            if (typeMap.Count != 0)
+            {
+                var typesArr = typeMap.Values.Select(type => type.ToString()).ToArray();
+                throw new Exception($"Unsatisfied dependencies {string.Join("", typesArr)}");
+            }
+        }
+
+        private object? InstantiateTypes(ConstructorInfo ctr)
+        {
+            var parameters = ctr.GetParameters();
+            var paramArgs = new List<object>(parameters.Length);
+            foreach (var parameter in parameters)
+            {
+                var paramType = parameter.ParameterType;
+                if (_instanceMap.ContainsKey(paramType))
+                {
+                    paramArgs.Add(_instanceMap[paramType]);
+                }
+                else
+                {
+                    break;
+                }
+
+            }
+
+            object? result = null;
+            if (parameters.Length == paramArgs.Count)
+            {
+                result = ctr.Invoke(paramArgs.ToArray());
+            }
+
+            return result;
+        }
+    }
+
+    public class ContainerBuilder
+    {
+        private readonly Dictionary<Type, object> _instanceMap = new Dictionary<Type, object>();
+        private readonly Dictionary<Type, Type> _typeMap = new Dictionary<Type, Type>();
+
+        public ContainerBuilder RegisterInstance<T>(T instance)
+        {
+            if (instance == null) throw new Exception("Null instance registration");
+
+            _instanceMap[typeof(T)] = instance;
+            return this;
+        }
+
+        public void Register<T>()
+        {
+            _typeMap[typeof(T)] = typeof(T);
+        }
+
+        public void Register<TYpe, TYpeAs>()
+        {
+            _typeMap[typeof(TYpe)] = typeof(TYpeAs);
+        }
+
+        public Container Build() => new Container(_instanceMap, _typeMap);
+    }
+}