Creates an empty Unity project. Loads very quickly!

create_empty_unity_package.cpp

#include <iostream>
#include <filesystem>
#include <fstream>

static void WriteToFile(const std::filesystem::path& path, const std::string& contents)
{
	std::ofstream ofs(path.string());
	if (ofs.is_open())
	{
		ofs << contents;
	}
}

int main(int argc, char* argv[])
{
	try
	{
		if (argc > 1)
		{
			std::filesystem::path project_directory_path(argv[1]);
			std::filesystem::path assets_directory(project_directory_path / "Assets");
			std::filesystem::path packages_directory(project_directory_path / "Packages");
			std::filesystem::path project_settings_directory(project_directory_path / "ProjectSettings");
			if (std::filesystem::create_directories(assets_directory) &&
				std::filesystem::create_directories(packages_directory) &&
				std::filesystem::create_directories(project_settings_directory))
			{
				std::string editor_version((argc > 2) ? argv[2] : "2020.1.4f1");
				std::filesystem::path manifest_json_path(packages_directory / "manifest.json");
				std::filesystem::path project_version_txt_path(project_settings_directory / "ProjectVersion.txt");
				WriteToFile(manifest_json_path, "{\"dependencies\": {}}\n");
				WriteToFile(project_version_txt_path, "m_EditorVersion: " + editor_version);
			}
		}
	}
	catch (const std::exception& e)
	{
		std::cerr << e.what() << std::endl;
	}
	catch (...)
	{
		std::cerr << "An unknown error has occured :(" << std::endl;
	}
	return 0;
}