add '--stdin-cmd' command line flag

src/devtools/stdin_reader.cpp

@@ -13,6 +13,8 @@ static std::thread reader_thread;
 
 void start_stdin_reader(cmd::CommandsInterpreter& interpreter) {
     reader_thread = std::thread([&interpreter]() {
+        logger.info() << "reader thread started";
+        
         std::string line;
         while (std::getline(std::cin, line)) {
             if (line.empty()) {

src/engine/CoreParameters.hpp

@@ -6,6 +6,7 @@
 struct CoreParameters {
     bool headless = false;
     bool testMode = false;
+    bool stdinCommands = false;
     std::filesystem::path resFolder = "res";
     std::filesystem::path userFolder = ".";
     std::filesystem::path scriptFile;

src/engine/Engine.cpp

@@ -192,8 +192,9 @@ void Engine::initialize(CoreParameters coreParameters) {
     if (!params.headless) {
         project->loadProjectClientScript();
     }
-
+    if (params.stdinCommands) {
-    start_stdin_reader(*cmd);
+        start_stdin_reader(*cmd);
+    }
 }
 
 void Engine::loadSettings() {

src/util/command_line.cpp

@@ -62,6 +62,10 @@ static bool perform_keyword(
             params.headless = true;
             return true;
         }, "", "run in headless mode."),
+        ArgC("--stdin-cmd", [&params]() -> bool {
+            params.stdinCommands = true;
+            return true;
+        }, "", "run commands from stdin."),
         ArgC("--tps", [&params, &reader]() -> bool {
             params.tps = reader.nextInt();
             return true;