GameList: Add function to query whether database exists

src/core/game_list.cpp

@@ -689,6 +689,11 @@ void GameList::SetSearchDirectoriesFromSettings(SettingsInterface& si)
     m_search_directories.push_back({std::move(dir), true});
 }
 
+bool GameList::IsDatabasePresent() const
+{
+  return FileSystem::FileExists(m_database_filename.c_str());
+}
+
 void GameList::Refresh(bool invalidate_cache, bool invalidate_database)
 {
   if (invalidate_cache)

src/core/game_list.h

@@ -65,8 +65,10 @@ public:
 
   void SetCacheFilename(std::string filename) { m_cache_filename = std::move(filename); }
   void SetDatabaseFilename(std::string filename) { m_database_filename = std::move(filename); }
-
   void SetSearchDirectoriesFromSettings(SettingsInterface& si);
+
+  bool IsDatabasePresent() const;
+
   void AddDirectory(std::string path, bool recursive);
   void Refresh(bool invalidate_cache, bool invalidate_database);