Add FUSE external mapping support, BG3/Oblivion Remastered fixes, fomod-plus and NaK integration

FUSE VFS now deploys non-data-dir mod mappings (Paks, OBSE, UE4SS, etc.)
via real symlinks and injects file-level data-dir mappings (plugins.txt,
loadorder.txt) into the VFS tree. Fixes game launches for Oblivion
Remastered (Root Builder path resolution, script extender support) and
BG3 (Wine prefix documents directory, file mapper symlinks on Linux).

Vendors mo2-fomod-plus plugin and NaK crate for FOMOD installer and
game finder/runtime support.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/libs/installer_fomod_plus/installer/lib/ConditionTester.h b/libs/installer_fomod_plus/installer/lib/ConditionTester.h
new file mode 100644
index 0000000..09aa26e
--- /dev/null
+++ b/libs/installer_fomod_plus/installer/lib/ConditionTester.h
@@ -0,0 +1,42 @@
+#pragma once
+
+#include <imoinfo.h>
+
+#include "FlagMap.h"
+#include "Logger.h"
+#include "xml/ModuleConfiguration.h"
+
+class CompositeDependency;
+class StepViewModel;
+
+class ConditionTester {
+public:
+    explicit ConditionTester(MOBase::IOrganizer* organizer) : mOrganizer(organizer) {}
+
+    bool isStepVisible(const std::shared_ptr<FlagMap>& flags, const CompositeDependency& compositeDependency,
+        int stepIndex,
+        const std::vector<std::shared_ptr<StepViewModel>>& steps) const;
+
+    bool testCompositeDependency(const std::shared_ptr<FlagMap>& flags,
+        const CompositeDependency& compositeDependency) const;
+
+    static bool testFlagDependency(const std::shared_ptr<FlagMap>& flags, const FlagDependency& flagDependency);
+
+    [[nodiscard]] bool testFileDependency(const FileDependency& fileDependency) const;
+
+    bool testGameDependency(const GameDependency& gameDependency) const;
+
+private:
+    Logger& log = Logger::getInstance();
+    MOBase::IOrganizer* mOrganizer;
+
+    friend class FomodViewModel;
+
+    [[nodiscard]] FileDependencyTypeEnum getFileDependencyStateForPlugin(const std::string& pluginName) const;
+
+    PluginTypeEnum getPluginTypeDescriptorState(const std::shared_ptr<Plugin>& plugin,
+        const std::shared_ptr<FlagMap>& flags) const;
+
+    mutable std::unordered_map<std::string, FileDependencyTypeEnum> pluginStateCache;
+
+};