From 1971f1b4eb945f04a50670bc03d1e953c2e5280e Mon Sep 17 00:00:00 2001
From: m <mjkzyalt@gmail.com>
Date: Thu, 22 Dec 2022 11:07:51 -0600
Subject: [PATCH] use fs_game w/ mod support

---
 src/client/component/command.cpp      |  6 +--
 src/client/component/mods.cpp         | 58 ++++++++++++++++++++++-----
 src/client/component/mods.hpp         |  2 +-
 src/client/component/ui_scripting.cpp |  3 +-
 4 files changed, 54 insertions(+), 15 deletions(-)

diff --git a/src/client/component/command.cpp b/src/client/component/command.cpp
index 7a8588d5..58c0918d 100644
--- a/src/client/component/command.cpp
+++ b/src/client/component/command.cpp
@@ -28,7 +28,7 @@ namespace command
 		std::unordered_map<std::string, std::function<void(params&)>> handlers;
 		std::unordered_map<std::string, std::function<void(int, params_sv&)>> handlers_sv;
 
-		std::string saved_fs_game;
+		std::optional<std::string> saved_fs_game;
 
 		void main_handler()
 		{
@@ -563,10 +563,10 @@ namespace command
 		const auto new_mod_path = fs_game->current.string;
 
 		// check if the last saved fs_game value isn't empty and if it doesn't equal the new fs_game
-		if (!saved_fs_game.empty() && saved_fs_game != new_mod_path)
+		if (saved_fs_game.has_value() && saved_fs_game != new_mod_path)
 		{
 			// unregister path to be used as a fs directory
-			filesystem::unregister_path(saved_fs_game);
+			filesystem::unregister_path(saved_fs_game.value());
 		}
 
 		if (new_mod_path && !new_mod_path[0])
diff --git a/src/client/component/mods.cpp b/src/client/component/mods.cpp
index 2d8d898b..fb124d2a 100644
--- a/src/client/component/mods.cpp
+++ b/src/client/component/mods.cpp
@@ -17,7 +17,7 @@
 
 namespace mods
 {
-	std::string mod_path{};
+	std::optional<std::string> mod_path;
 
 	namespace
 	{
@@ -51,6 +51,13 @@ namespace mods
 
 		void full_restart(const std::string& arg)
 		{
+			if (game::environment::is_mp())
+			{
+				// vid_restart works on multiplayer, but not on singleplayer
+				command::execute("vid_restart");
+				return;
+			}
+
 			auto mode = game::environment::is_mp() ? " -multiplayer "s : " -singleplayer "s;
 
 			utils::nt::relaunch_self(mode.append(arg), true);
@@ -63,6 +70,38 @@ namespace mods
 		return utils::io::file_exists(path + "/mod.ff") || utils::io::file_exists(path + "/zone/mod.ff");
 	}
 
+	void set_filesystem_data(const std::string& path)
+	{
+		if (mod_path.has_value())
+		{
+			filesystem::unregister_path(mod_path.value());
+		}
+
+		if (!game::environment::is_sp())
+		{
+			// modify fs_game on mp/dedi because its not set when we obviously vid_restart (sp does a full relaunch with command line arguments)
+			game::Dvar_SetFromStringByNameFromSource("fs_game", path.data(),
+				game::DVAR_SOURCE_INTERNAL);
+		}
+	}
+
+	void set_mod(const std::string& path)
+	{
+		set_filesystem_data(path);
+		mod_path = path;
+	}
+
+	void clear_mod()
+	{
+		set_filesystem_data("");
+		mod_path.reset();
+	}
+
+	std::optional<std::string> get_mod()
+	{
+		return mod_path;
+	}
+
 	class component final : public component_interface
 	{
 	public:
@@ -98,24 +137,23 @@ namespace mods
 				}
 
 				console::info("Loading mod %s\n", path);
+				set_mod(path);
 
-				if (mod_requires_restart(mod_path) || mod_requires_restart(path))
+				if ((mod_path.has_value() && mod_requires_restart(mod_path.value())) ||
+					mod_requires_restart(path))
 				{
 					console::info("Restarting...\n");
 					full_restart("+set fs_game \""s + path + "\"");
 				}
 				else
 				{
-					filesystem::unregister_path(mod_path);
-					filesystem::register_path(path);
-					mod_path = path;
 					restart();
 				}
 			});
 
 			command::add("unloadmod", [](const command::params& params)
 			{
-				if (mod_path.empty())
+				if (!mod_path.has_value())
 				{
 					console::info("No mod loaded\n");
 					return;
@@ -128,17 +166,17 @@ namespace mods
 					return;
 				}
 
-				console::info("Unloading mod %s\n", mod_path.data());
+				console::info("Unloading mod %s\n", mod_path.value().data());
 
-				if (mod_requires_restart(mod_path))
+				if (mod_requires_restart(mod_path.value()))
 				{
 					console::info("Restarting...\n");
+					clear_mod();
 					full_restart("");
 				}
 				else
 				{
-					filesystem::unregister_path(mod_path);
-					mod_path.clear();
+					clear_mod();
 					restart();
 				}
 			});
diff --git a/src/client/component/mods.hpp b/src/client/component/mods.hpp
index 364a2f11..f7b47293 100644
--- a/src/client/component/mods.hpp
+++ b/src/client/component/mods.hpp
@@ -2,5 +2,5 @@
 
 namespace mods
 {
-	extern std::string mod_path;
+	std::optional<std::string> get_mod();
 }
\ No newline at end of file
diff --git a/src/client/component/ui_scripting.cpp b/src/client/component/ui_scripting.cpp
index 7e2e0d5e..1fcfb1d1 100644
--- a/src/client/component/ui_scripting.cpp
+++ b/src/client/component/ui_scripting.cpp
@@ -268,7 +268,8 @@ namespace ui_scripting
 
 			game_type["getloadedmod"] = [](const game&)
 			{
-				return mods::mod_path;
+				const auto& path = mods::get_mod();
+				return path.value_or("");
 			};
 
 			if (::game::environment::is_sp())