feat: ultimate partner SAR detection

orange says hello (plaintext but unlikely to be accidental lmao)
blue receives, now knows orange has sar, sends acknowledgement back, now both players know they have sar
this happens once per partnership, not every load

src/Features/NetMessage.cpp

@@ -22,6 +22,7 @@
 // if orange: whether we've sent the ready packet
 bool g_orangeReady = false;
 bool g_partnerHasSAR = false;
+bool g_session_init = false;
 
 static size_t g_expected_len = 0;
 static std::string g_partial;
@@ -58,9 +59,20 @@ static bool readyToSend() {
 	}
 }
 
+void NetMessage::SessionStarted() {
+	if (engine->IsCoop() && !engine->IsSplitscreen()) {
+		if (!g_session_init && engine->IsOrange()) {
+			g_session_init = true;
+			engine->ExecuteCommand("say \"" SAR_MSG_HELLO "\"");
+		}
+	} else {
+		g_session_init = false;
+		g_partnerHasSAR = false;
+	}
+}
+
 void NetMessage::SessionEnded() {
 	g_orangeReady = false;
-	g_partnerHasSAR = false;
 }
 
 struct QueuedMsg {
@@ -162,8 +174,8 @@ void NetMessage::SendMsg(const char *type, const void *data, size_t size) {
 		return;
 	}
 
-	// If the partner doesn't have SAR, only send sync messages
-	if (!readyToSend() || (!g_partnerHasSAR && !!strcmp(type, "__sync"))) {
+	// If the partner doesn't have SAR, don't send messages
+	if (!readyToSend() || !g_partnerHasSAR) {
 		g_queued.push({
 			std::string(type),
 			std::vector<uint8_t>((const uint8_t *)data, (const uint8_t *)data + size),
@@ -229,6 +241,19 @@ void NetMessage::Update() {
 bool NetMessage::ChatData(std::string str) {
 	if (str.size() < 4) return false;
 
+	if (str == SAR_MSG_HELLO) {
+		if (!engine->IsOrange()) {
+			g_partnerHasSAR = true;
+			engine->ExecuteCommand("say \"" SAR_MSG_HELLO_ACK "\"");
+		}
+		return true;
+	} else if (str == SAR_MSG_HELLO_ACK) {
+		if (engine->IsOrange()) {
+			g_partnerHasSAR = true;
+		}
+		return true;
+	}
+
 	std::string prefix = str.substr(0, 4);
 	bool has_prefix = true;
 	bool cont, orange;

src/Features/NetMessage.hpp

@@ -6,10 +6,14 @@
 extern bool g_orangeReady;
 extern bool g_partnerHasSAR;
 
+#define SAR_MSG_HELLO "Hello! I have \x07SourceAutoRecord\x07, a plugin mainly used for speedrunning."
+#define SAR_MSG_HELLO_ACK "&^@$Yes hello I also have \x07SourceAutoRecord\x07 thank you for checking before spamming chat."
+
 namespace NetMessage {
 	void RegisterHandler(const char *type, void (*handler)(const void *data, size_t size));
 	void SendMsg(const char *type, const void *data, size_t size);
 	bool ChatData(std::string str);
 	void Update();
+	void SessionStarted();
 	void SessionEnded();
 };  // namespace NetMessage

src/Features/Session.cpp

@@ -71,6 +71,8 @@ void Session::Started(bool menu) {
 		return;
 	}
 
+	NetMessage::SessionStarted();
+
 	if (menu) {
 		console->Print("Session started! (menu)\n");
 		this->Rebase(engine->GetTick());

src/Modules/Server.cpp

@@ -1071,7 +1071,10 @@ CON_COMMAND(sar_give_betsrighter, "sar_give_betsrighter [n] - gives the player i
 }
 DETOUR_COMMAND(Server::say) {
 	auto clientidx = UTIL_GetCommandClientIndex();
-	if (args.ArgC() != 2 || Utils::StartsWith(args[1], "&^") || !networkManager.HandleGhostSay(args[1], clientidx)) {
+	if (args.ArgC() != 2 ||
+		Utils::StartsWith(args[1], "&^") ||
+		!strcmp(args[1], "\"" SAR_MSG_HELLO "\"") ||
+		!networkManager.HandleGhostSay(args[1], clientidx)) {
 		g_wasChatType = 0;
 		Server::say_callback(args);
 	}