fix cmd reader blocking main thread

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();
 }