Added NVSEInstaller

src/Games/NexusMods.Games.Obsidian/FalloutNewVegas/FalloutNewVegas.cs

@@ -14,6 +14,7 @@
 using NexusMods.Games.FOMOD;
 using NexusMods.Games.Generic.Installers;
 using NexusMods.Games.Obsidian.FalloutNewVegas.Emitters;
+using NexusMods.Games.Obsidian.FalloutNewVegas.Installers;
 using NexusMods.Paths;
 using NexusMods.Paths.Utilities;
 
@@ -80,6 +81,7 @@ public override GamePath GetPrimaryFile(GameStore store)
 
     public override ILibraryItemInstaller[] LibraryItemInstallers =>
     [
+        new NVSEInstaller(_serviceProvider),
         new GenericPatternMatchInstaller(_serviceProvider)
         {
             InstallFolderTargets =

src/Games/NexusMods.Games.Obsidian/FalloutNewVegas/Installers/NVSEInstaller.cs

@@ -0,0 +1,58 @@
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
+using NexusMods.Abstractions.GameLocators;
+using NexusMods.Abstractions.Library.Installers;
+using NexusMods.Abstractions.Library.Models;
+using NexusMods.Abstractions.Loadouts;
+using NexusMods.MnemonicDB.Abstractions;
+using NexusMods.Paths;
+using NexusMods.Paths.Trees;
+using NexusMods.Paths.Trees.Traits;
+
+namespace NexusMods.Games.Obsidian.FalloutNewVegas.Installers;
+
+public class NVSEInstaller(IServiceProvider serviceProvider) : ALibraryArchiveInstaller(serviceProvider, serviceProvider.GetRequiredService<ILogger<NVSEInstaller>>())
+{
+    public override ValueTask<InstallerResult> ExecuteAsync(
+        LibraryArchive.ReadOnly libraryArchive,
+        LoadoutItemGroup.New loadoutGroup,
+        ITransaction transaction,
+        Loadout.ReadOnly loadout,
+        CancellationToken cancellationToken)
+    {
+        var tree = libraryArchive.GetTree();
+        var keys = new[] { "nvse_1_4.dll", "nvse_editor_1_4.dll", "nvse_loader.exe", "nvse_steam_loader.dll" };
+
+
+        List<LoadoutFile.New> results = [];
+        foreach (var fileNode in tree.EnumerateFilesBfs())
+        {
+            var relativePath = new RelativePath(fileNode.Value.Item.Path.Name);
+            if (!keys.Contains(relativePath.Name.ToString()))
+            {
+                continue;
+            };
+
+            var loadoutFile = new LoadoutFile.New(transaction, out var id)
+            {
+                LoadoutItemWithTargetPath = new LoadoutItemWithTargetPath.New(transaction, id)
+                {
+                    TargetPath = (loadout.Id, LocationId.Game, relativePath),
+                    LoadoutItem = new LoadoutItem.New(transaction, id)
+                    {
+                        Name = relativePath.Name,
+                        LoadoutId = loadout.Id,
+                        ParentId = loadoutGroup.Id,
+                    },
+                },
+                Hash = fileNode.Value.Item.LibraryFile.Value.Hash,
+                Size = fileNode.Value.Item.LibraryFile.Value.Size,
+            };
+            results.Add(loadoutFile);
+        }
+
+        return results.Count > 0
+            ? ValueTask.FromResult<InstallerResult>(new Success())
+            : ValueTask.FromResult<InstallerResult>(new NotSupported());
+    }
+}