+static void script_log_add_source(lua_State *L, std::string &message, int stack_depth)
+{
+ lua_Debug ar;
+
+ if (lua_getstack(L, stack_depth, &ar)) {
+ FATAL_ERROR_IF(!lua_getinfo(L, "Sl", &ar), "lua_getinfo() failed");
+ message.append(" (at " + std::string(ar.short_src) + ":"
+ + std::to_string(ar.currentline) + ")");
+ } else {
+ message.append(" (at ?:?)");
+ }
+}
+
+bool script_log_unique(lua_State *L, std::string message, std::ostream &log_to,
+ int stack_depth)
+{
+ thread_local std::vector<u64> logged_messages;
+
+ script_log_add_source(L, message, stack_depth);
+ u64 hash = murmur_hash_64_ua(message.data(), message.length(), 0xBADBABE);
+
+ if (std::find(logged_messages.begin(), logged_messages.end(), hash)
+ == logged_messages.end()) {
+
+ logged_messages.emplace_back(hash);
+ log_to << message << std::endl;
+ return true;
+ }
+ return false;
+}
+
+DeprecatedHandlingMode get_deprecated_handling_mode()
+{
+ static thread_local bool configured = false;
+ static thread_local DeprecatedHandlingMode ret = DeprecatedHandlingMode::Ignore;
+
+ // Only read settings on first call
+ if (!configured) {
+ std::string value = g_settings->get("deprecated_lua_api_handling");
+ if (value == "log") {
+ ret = DeprecatedHandlingMode::Log;
+ } else if (value == "error") {
+ ret = DeprecatedHandlingMode::Error;
+ }
+ configured = true;
+ }
+
+ return ret;
+}
+
+void log_deprecated(lua_State *L, std::string message, int stack_depth)
+{
+ DeprecatedHandlingMode mode = get_deprecated_handling_mode();
+ if (mode == DeprecatedHandlingMode::Ignore)
+ return;
+
+ script_log_add_source(L, message, stack_depth);
+ warningstream << message << std::endl;
+
+ if (mode == DeprecatedHandlingMode::Error)
+ script_error(L, LUA_ERRRUN, NULL, NULL);
+ else
+ infostream << script_get_backtrace(L) << std::endl;
+}