[CSM] Add send_chat_message and run_server_chatcommand API functions (#5747)

* [CSM] Add send_chat_message and run_server_chatcommand API functions

* Add client-side chat message rate limiting

* Limit out chat queue size

* [CSM] Add minetest.clear_out_chat_queue API function and .clear_chat_queue chatcommand

* Last fixes/cleanups before merge

2 files changed, 25 insertions, 0 deletions

diff --git a/src/script/lua_api/l_client.cpp b/src/script/lua_api/l_client.cpp
index 09b832ccf..0b7450af2 100644
--- a/src/script/lua_api/l_client.cpp
+++ b/src/script/lua_api/l_client.cpp
@@ -85,6 +85,23 @@ int ModApiClient::l_display_chat_message(lua_State *L)
 	return 1;
 }
 
+// send_chat_message(message)
+int ModApiClient::l_send_chat_message(lua_State *L)
+{
+	if (!lua_isstring(L,1))
+		return 0;
+	std::string message = luaL_checkstring(L, 1);
+	getClient(L)->sendChatMessage(utf8_to_wide(message));
+	return 0;
+}
+
+// clear_out_chat_queue()
+int ModApiClient::l_clear_out_chat_queue(lua_State *L)
+{
+	getClient(L)->clearOutChatQueue();
+	return 0;
+}
+
 // get_player_names()
 int ModApiClient::l_get_player_names(lua_State *L)
 {
@@ -317,6 +334,8 @@ void ModApiClient::Initialize(lua_State *L, int top)
 	API_FCT(get_current_modname);
 	API_FCT(print);
 	API_FCT(display_chat_message);
+	API_FCT(send_chat_message);
+	API_FCT(clear_out_chat_queue);
 	API_FCT(get_player_names);
 	API_FCT(set_last_run_mod);
 	API_FCT(get_last_run_mod);
diff --git a/src/script/lua_api/l_client.h b/src/script/lua_api/l_client.h
index 09b74addd..fe5780fb1 100644
--- a/src/script/lua_api/l_client.h
+++ b/src/script/lua_api/l_client.h
@@ -37,6 +37,12 @@ private:
 	// display_chat_message(message)
 	static int l_display_chat_message(lua_State *L);
 
+	// send_chat_message(message)
+	static int l_send_chat_message(lua_State *L);
+
+	// clear_out_chat_queue()
+	static int l_clear_out_chat_queue(lua_State *L);
+
 	// get_player_names()
 	static int l_get_player_names(lua_State *L);