Add Get/SetAdditionalDataPaths to GameInterface

include/loot/game_interface.h

@@ -39,6 +39,25 @@ public:
    */
   virtual GameType GetType() const = 0;
 
+  /**
+   * @brief   Gets the currently-set additional data paths.
+   * @details Only Fallout 4 installed from the Microsoft Store is configured
+   *          with any additional data paths by default, as its DLC directories
+   *          are installed outside of the Fallout 4 install path.
+   */
+  virtual std::vector<std::filesystem::path> GetAdditionalDataPaths() const = 0;
+
+  /**
+   * @brief   Set additional data paths.
+   * @details The additional data paths are used when interacting with the load
+   *          order, evaluating conditions and scanning for archives (BSA/BA2
+   *          depending on the game). Additional data paths are used in the
+   *          order they are given, and take precedence over the game's main
+   *          data path.
+   */
+  virtual void SetAdditionalDataPaths(
+      const std::vector<std::filesystem::path>& additionalDataPaths) = 0;
+
   /**
    *  @name Metadata Access
    *  @{

src/api/game/game.cpp

@@ -154,7 +154,7 @@ Game::Game(const GameType gameType,
     conditionEvaluator_(
         std::make_shared<ConditionEvaluator>(GetType(), DataPath())),
     database_(ApiDatabase(conditionEvaluator_)),
-    additionalDataPaths_(GetAdditionalDataPaths(GetType(), DataPath())) {
+    additionalDataPaths_(::GetAdditionalDataPaths(GetType(), DataPath())) {
   conditionEvaluator_->SetAdditionalDataPaths(additionalDataPaths_);
 }
 
@@ -182,6 +182,10 @@ const DatabaseInterface& Game::GetDatabase() const { return database_; }
 
 DatabaseInterface& Game::GetDatabase() { return database_; }
 
+std::vector<std::filesystem::path> Game::GetAdditionalDataPaths() const {
+  return additionalDataPaths_;
+}
+
 void Game::SetAdditionalDataPaths(
     const std::vector<std::filesystem::path>& additionalDataPaths) {
   additionalDataPaths_ = additionalDataPaths;

src/api/game/game.h

@@ -52,14 +52,16 @@ public:
   LoadOrderHandler& GetLoadOrderHandler();
   const LoadOrderHandler& GetLoadOrderHandler() const;
 
-  void SetAdditionalDataPaths(
-      const std::vector<std::filesystem::path>& additionalDataPaths);
-
   // Game Interface Methods //
   ////////////////////////////
 
   GameType GetType() const override;
 
+  std::vector<std::filesystem::path> GetAdditionalDataPaths() const;
+
+  void SetAdditionalDataPaths(
+      const std::vector<std::filesystem::path>& additionalDataPaths) override;
+
   DatabaseInterface& GetDatabase() override;
   const DatabaseInterface& GetDatabase() const override;
 

src/tests/api/interface/game_interface_test.h

@@ -70,6 +70,15 @@ INSTANTIATE_TEST_SUITE_P(,
                                            GameType::fo4,
                                            GameType::tes5se));
 
+TEST_P(GameInterfaceTest, setAdditionalDataPathsShouldDoThat) {
+  const auto paths = std::vector<std::filesystem::path>{
+      localPath, localPath.parent_path() / "other"};
+
+  handle_->SetAdditionalDataPaths(paths);
+
+  EXPECT_EQ(paths, handle_->GetAdditionalDataPaths());
+}
+
 TEST_P(GameInterfaceTest, isValidPluginShouldReturnTrueForAValidPlugin) {
   EXPECT_TRUE(handle_->IsValidPlugin(blankEsm));
 }