fix cmd reader blocking main thread

src/devtools/stdin_cmd_reader.cpp

@@ -4,6 +4,7 @@
 #include "logic/CommandsInterpreter.hpp"
 #include "coders/json.hpp"
 #include "debug/Logger.hpp"
+#include "util/platform.hpp"
 
 #include <thread>
 #include <iostream>
@@ -18,7 +19,12 @@ void cmd::start_stdin_cmd_reader(Engine& engine) {
         logger.info() << "reader thread started";
         
         std::string line;
-        while (std::getline(std::cin, line)) {
+        while (true) {
+            if (!platform::stdin_has_data()) {
+                platform::sleep(10);
+                continue;
+            }
+            std::getline(std::cin, line);
             if (line.empty()) {
                 continue;
             }

src/util/platform.cpp

@@ -14,8 +14,10 @@
 
 #ifdef _WIN32
 #include <Windows.h>
+#include <conio.h>
 #pragma comment(lib, "winmm.lib")
 #else
+#include <sys/poll.h>
 #include <unistd.h>
 #endif
 
@@ -290,3 +292,14 @@ void platform::new_engine_instance(const std::vector<std::string>& args) {
     }
 #endif
 }
+
+bool platform::stdin_has_data() {
+#ifdef _WIN32
+    return _kbhit();
+#else
+    struct pollfd fds;
+    fds.fd = STDIN_FILENO;
+    fds.events = POLLIN;
+    return poll(&fds, 1, 0) == 1;
+#endif
+}

src/util/platform.hpp

@@ -21,4 +21,6 @@ namespace platform {
     void new_engine_instance(const std::vector<std::string>& args);
     /// @brief Open URL in web browser 
     bool open_url(const std::string& url);
+    /// @brief Check if stdin has input
+    bool stdin_has_data();
 }