Use t6-gsc-utils as a base.

src/utils/flags.cpp

@@ -0,0 +1,54 @@
+#include <stdinc.hpp>
+
+#include "flags.hpp"
+#include "string.hpp"
+
+#include <shellapi.h>
+
+namespace utils::flags
+{
+	void parse_flags(std::vector<std::string>& flags)
+	{
+		int num_args;
+		auto* const argv = CommandLineToArgvW(GetCommandLineW(), &num_args);
+
+		flags.clear();
+
+		if (argv)
+		{
+			for (auto i = 0; i < num_args; ++i)
+			{
+				std::wstring wide_flag(argv[i]);
+				if (wide_flag[0] == L'-')
+				{
+					wide_flag.erase(wide_flag.begin());
+					flags.emplace_back(string::convert(wide_flag));
+				}
+			}
+
+			LocalFree(argv);
+		}
+	}
+
+	bool has_flag(const std::string& flag)
+	{
+		static auto parsed = false;
+		static std::vector<std::string> enabled_flags;
+
+		if (!parsed)
+		{
+			parse_flags(enabled_flags);
+			parsed = true;
+		}
+
+		for (const auto& entry : enabled_flags)
+		{
+			if (string::to_lower(entry) == string::to_lower(flag))
+			{
+				return true;
+			}
+		}
+
+		return false;
+	}
+}