Add project files.

Hoi3Launcher.sln

@@ -0,0 +1,27 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Hoi3Launcher", "src\Hoi3Launcher\Hoi3Launcher.csproj", "{9F24DCCA-7D85-4A9F-9EE9-8E9172C15A9C}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{544CA754-645F-43BF-9B8C-CE769E4CB20C}"
+	ProjectSection(SolutionItems) = preProject
+		README.md = README.md
+	EndProjectSection
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{9F24DCCA-7D85-4A9F-9EE9-8E9172C15A9C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{9F24DCCA-7D85-4A9F-9EE9-8E9172C15A9C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{9F24DCCA-7D85-4A9F-9EE9-8E9172C15A9C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{9F24DCCA-7D85-4A9F-9EE9-8E9172C15A9C}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

src/Hoi3Launcher/App.axaml

@@ -0,0 +1,13 @@
+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="Hoi3Launcher.App"
+             xmlns:sty="using:FluentAvalonia.Styling"
+             RequestedThemeVariant="Default">
+             <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
+
+    <Application.Styles>
+        <ClassicTheme />
+        <!--<SimpleTheme />-->
+        <!--<sty:FluentAvaloniaTheme />-->
+    </Application.Styles>
+</Application>

src/Hoi3Launcher/App.axaml.cs

@@ -0,0 +1,48 @@
+using System.Linq;
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Data.Core;
+using Avalonia.Data.Core.Plugins;
+using Avalonia.Markup.Xaml;
+using Hoi3Launcher.ViewModels;
+using Hoi3Launcher.Views;
+
+namespace Hoi3Launcher
+{
+    public partial class App : Application
+    {
+        public override void Initialize()
+        {
+            AvaloniaXamlLoader.Load(this);
+        }
+
+        public override void OnFrameworkInitializationCompleted()
+        {
+            if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+            {
+                // Avoid duplicate validations from both Avalonia and the CommunityToolkit. 
+                // More info: https://docs.avaloniaui.net/docs/guides/development-guides/data-validation#manage-validationplugins
+                DisableAvaloniaDataAnnotationValidation();
+                desktop.MainWindow = new MainWindow
+                {
+                    DataContext = new MainWindowViewModel(),
+                };
+            }
+
+            base.OnFrameworkInitializationCompleted();
+        }
+
+        private void DisableAvaloniaDataAnnotationValidation()
+        {
+            // Get an array of plugins to remove
+            var dataValidationPluginsToRemove =
+                BindingPlugins.DataValidators.OfType<DataAnnotationsValidationPlugin>().ToArray();
+
+            // remove each entry found
+            foreach (var plugin in dataValidationPluginsToRemove)
+            {
+                BindingPlugins.DataValidators.Remove(plugin);
+            }
+        }
+    }
+}

src/Hoi3Launcher/Hoi3Launcher.csproj

@@ -0,0 +1,31 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
+    <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+    <PublishAot>true</PublishAot>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <AvaloniaResource Include="Assets\**" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Avalonia" Version="11.2.1" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.2.1" />
+    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.2.1" />
+    <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
+    <PackageReference Include="Avalonia.Diagnostics" Version="11.2.1">
+      <IncludeAssets Condition="'$(Configuration)' != 'Debug'">None</IncludeAssets>
+      <PrivateAssets Condition="'$(Configuration)' != 'Debug'">All</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="CommunityToolkit.Mvvm" Version="8.2.1" />
+    <PackageReference Include="Classic.Avalonia.Theme" Version="11.2.0.6" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Folder Include="Services\" />
+  </ItemGroup>
+</Project>

src/Hoi3Launcher/Models/Dlc.cs

@@ -0,0 +1,10 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Hoi3Launcher.Models
+{
+    public record Dlc(string Name, string ExecutableName, IEnumerable<Mod> Mods);
+}

src/Hoi3Launcher/Models/Mod.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Hoi3Launcher.Models
+{
+    public record Mod(string Name, string Path)
+    {
+        public bool IsEnabled { get; set; }
+    }
+}

src/Hoi3Launcher/Program.cs

@@ -0,0 +1,22 @@
+using System;
+using Avalonia;
+
+namespace Hoi3Launcher
+{
+    internal sealed class Program
+    {
+        // Initialization code. Don't use any Avalonia, third-party APIs or any
+        // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
+        // yet and stuff might break.
+        [STAThread]
+        public static void Main(string[] args) => BuildAvaloniaApp()
+            .StartWithClassicDesktopLifetime(args);
+
+        // Avalonia configuration, don't remove; also used by visual designer.
+        public static AppBuilder BuildAvaloniaApp()
+            => AppBuilder.Configure<App>()
+                .UsePlatformDetect()
+                .WithInterFont()
+                .LogToTrace();
+    }
+}

src/Hoi3Launcher/Properties/launchSettings.json

@@ -0,0 +1,8 @@
+{
+  "profiles": {
+    "Hoi3Launcher": {
+      "commandName": "Project",
+      "workingDirectory": "E:\\Games\\Hearts of Iron III"
+    }
+  }
+}

src/Hoi3Launcher/Services/LastModsService.cs

@@ -0,0 +1,62 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text.Json.Nodes;
+using System.Threading.Tasks;
+using Hoi3Launcher.Models;
+
+namespace Hoi3Launcher.Services;
+
+public class LastModsService
+{
+	public void Load(IEnumerable<Dlc> dlcs)
+	{
+		string path = GetPath();
+		if (!File.Exists(path))
+			return;
+
+		JsonNode? json = JsonNode.Parse(File.ReadAllText(path));
+		if (json is null)
+			return;
+
+		foreach (Dlc dlc in dlcs)
+		{
+			JsonNode? modsNode = json[dlc.Name];
+			if (modsNode is null)
+				continue;
+
+			HashSet<string> mods = modsNode.AsArray()
+				.Select(m => m!.AsValue().GetValue<string>())
+				.ToHashSet();
+
+			foreach (Mod mod in dlc.Mods)
+			{
+				if (mods.Contains(mod.Name))
+					mod.IsEnabled = true;
+			}
+		}
+	}
+
+	private static string GetPath()
+	{
+		return Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "Hoi3Launcher/mods.json");
+	}
+
+	public Task Save(IEnumerable<Dlc> dlcs)
+	{
+		JsonNode node = new JsonObject();
+		foreach (Dlc dlc in dlcs)
+		{
+			JsonValue[] jsonMods = (from m in dlc.Mods
+				where m.IsEnabled
+				select JsonValue.Create(m.Name)).ToArray();
+			string name = dlc.Name;
+			JsonNode[] items = jsonMods;
+			node[name] = new JsonArray(items);
+		}
+		string path = GetPath();
+		Directory.CreateDirectory(Path.GetDirectoryName(path));
+		return File.WriteAllTextAsync(path, node.ToJsonString());
+	}
+}

src/Hoi3Launcher/Services/Launcher.cs

@@ -0,0 +1,24 @@
+using System.Diagnostics;
+using System.Linq;
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Hoi3Launcher.Models;
+
+namespace Hoi3Launcher.Services;
+
+public class Launcher
+{
+	public void LaunchGame(Dlc dlc)
+	{
+		Process.Start(dlc.ExecutableName, dlc.Mods.Select(m => $"-mod={m.Path}"));
+	}
+
+	public void CloseApplication()
+	{
+        Application application = Application.Current!;
+        if (application.ApplicationLifetime is ClassicDesktopStyleApplicationLifetime lifetime)
+		{
+			lifetime.Shutdown(0);
+		}
+	}
+}

src/Hoi3Launcher/Services/ModScanner.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using Hoi3Launcher.Models;
+using Hoi3Launcher.Utils;
+
+namespace Hoi3Launcher.Services;
+
+public class ModScanner
+{
+	public IEnumerable<Mod> LoadMods(string path)
+	{
+		if (!Directory.Exists(path))
+			return [];
+
+		var mods = new List<Mod>();
+        var folder = new DirectoryInfo(path);
+        foreach (FileInfo file in folder.EnumerateFiles())
+		{
+			if (!(file.Extension != ".mod"))
+			{
+				string name = ScriptUtils.ParseValue(File.ReadAllText(file.FullName), "name");
+				mods.Add(new Mod(name, "mod/" + file.Name));
+			}
+		}
+		return mods;
+	}
+}

src/Hoi3Launcher/Utils/ScriptUtils.cs

@@ -0,0 +1,13 @@
+namespace Hoi3Launcher.Utils
+{
+    public static class ScriptUtils
+    {
+        public static string ParseValue(string text, string key)
+        {
+            var startPosition = text.IndexOf(key);
+            var startQuote = text.IndexOf('"', startPosition) + 1;
+            var endQuote = text.IndexOf('"', startQuote);
+            return text[startQuote..endQuote];
+        }
+    }
+}

src/Hoi3Launcher/ViewModels/MainWindowViewModel.cs

@@ -0,0 +1,44 @@
+using System;
+using System.CodeDom.Compiler;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Diagnostics.CodeAnalysis;
+using System.Linq;
+using System.Threading.Tasks;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using Hoi3Launcher.Models;
+using Hoi3Launcher.Services;
+
+namespace Hoi3Launcher.ViewModels;
+
+public partial class MainWindowViewModel : ViewModelBase
+{
+	[ObservableProperty]
+	private Dlc? _selectedDlc;
+
+	private readonly ModScanner _modScanner = new();
+    private readonly LastModsService _lastModsService = new();
+    private readonly Launcher _launcher = new();
+
+	public ObservableCollection<Dlc> Dlcs { get; } = new ObservableCollection<Dlc>();
+
+	public void Load()
+	{
+		Dlcs.Add(new Dlc("Their Finest Hour", "hoi3_tfh.exe", _modScanner.LoadMods("tfh/mod/")));
+		Dlcs.Add(new Dlc("For the Motherland", "hoi3game.exe", _modScanner.LoadMods("mod/")));
+		_lastModsService.Load(Dlcs);
+		SelectedDlc = Dlcs.First();
+	}
+
+	[RelayCommand]
+	public async Task Launch()
+	{
+		if (SelectedDlc is null)
+			return;
+
+		await _lastModsService.Save(Dlcs);
+		_launcher.LaunchGame(SelectedDlc);
+		_launcher.CloseApplication();
+	}
+}

src/Hoi3Launcher/ViewModels/ViewModelBase.cs

@@ -0,0 +1,7 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace Hoi3Launcher.ViewModels;
+
+public class ViewModelBase : ObservableObject
+{
+}