A Better way using a couple of Modkeys to load an environment with just those plugins and their masters.

[Michael-wigontherun]

On discord in Dev Forum, "How to construct an environment with only a select few mods enabled and their Masters - Solved" this was discussed.

https://discord.com/channels/759302581448474626/1369726662694142032

This is the way we found to do it

public static void TestTransitiveMasterLocatorToLoadEnviroment()
{

    var locator = new TransitiveMasterLocator(
        new System.IO.Abstractions.FileSystem(),
        new DataDirectoryInjection(@"C:\Steam\steamapps\common\Skyrim Special Edition\Data"),
        new GameReleaseInjection(GameRelease.SkyrimSE));
    ModKey[] NeededPlugins = new ModKey[]
    {
        ModKey.FromFileName("Tem's Houses - Sarethi Farm.esp"),
        ModKey.FromFileName("Lux - Tem's Houses - Sarethi Farm.esp")
    };
    var masters = locator.GetAllMasters(NeededPlugins);
    Console.WriteLine("Masters Found: ");
    foreach (var master in masters)
    {
        Console.WriteLine(master.FileName);
    }

    Console.WriteLine();
    Console.WriteLine();
    HashSet<ModKey> OnlyLoadThese = masters.ToHashSet();
    using var env = GameEnvironment.Typical.Builder<ISkyrimMod, ISkyrimModGetter>(GameRelease.SkyrimSE)
        .TransformLoadOrderListings(x => x.Where(x => OnlyLoadThese.Contains(x.ModKey)))
        .WithTargetDataFolder(@"C:\Steam\steamapps\common\Skyrim Special Edition\Data")
        .Build();
    Console.WriteLine("Plugins Loaded in Environment: ");
    foreach (var plugin in env.LoadOrder.Items)
    {
        Console.WriteLine($"{plugin.ModKey}");
    }
}

But this was a lot of code to accomplish just the basic environment we wanted. Not to mention "TransitiveMasterLocator" was stated to be a primarily back end part of mutagen

[Michael-wigontherun]

Forgot the output picture

[Noggog]

Pushed a branch 612-a-better-way-using-a-couple-of-modkeys-to-load-an-environment-with-just-those-plugins-and-their-masters with some work on this topic

One thing we gotta hammer out is how to handle the ordering of the transitive masters.

We can use the TransitiveMasterLocator to get the mod keys we want active, but it might not be clear what the correct order for those masters is. The tool does no ordering of those modkeys.

In the case where some transitive masters rely on other transitive masters, the order would be important to get right. There's a few places we could get the ordering:

• Plugins.txt. But there's no guarantee the modkeys involved are listed on it. We'd only hope they were
• The mods themselves have their masters ordered. We could come up with a new tool that tries to order the transitive masters based on their own headers. This is an algorithm we could write.. but it would have the potential to throw if there was circular dependencies.

I think we first have to write that ordering algo before we can finish this card correctly