From 5a5bd5cb2ee2606d99aa904b34105c62d2f56091 Mon Sep 17 00:00:00 2001
From: MihailRis <mexaruc@gmail.com>
Date: Fri, 3 Oct 2025 22:02:56 +0300
Subject: [PATCH] add platform::new_engine_instance

---
 src/util/platform.cpp | 67 +++++++++++++++++++++++++++++++++++++++++++
 src/util/platform.hpp |  3 ++
 2 files changed, 70 insertions(+)

diff --git a/src/util/platform.cpp b/src/util/platform.cpp
index 7bb7f7f4..b36d5eb7 100644
--- a/src/util/platform.cpp
+++ b/src/util/platform.cpp
@@ -115,6 +115,73 @@ int platform::get_process_id() {
     return getpid();
 }
 
+void platform::new_engine_instance(const std::vector<std::string>& args) {
+    auto executable = get_executable_path();
+
+#ifdef _WIN32
+    std::stringstream ss;
+    for (int i = 0; i < args.size(); i++) {
+        ss << " " << util::quote(args[i]);
+    }
+
+    auto toWString = [](const std::string& src)  {
+        if (src.empty()) 
+            return L"";
+        int size = MultiByteToWideChar(CP_UTF8, 0, src.c_str(), -1, nullptr, 0);
+        if (size == 0) {
+            throw std::runtime_error(
+                "MultiByteToWideChar failed with code: " +
+                std::to_string(GetLastError())
+            )
+        }
+        std::vector<wchar_t> buffer(size);
+        MultiByteToWideChar(CP_UTF8, 0, src.c_str(), -1, buffer.data(), size);
+        return std::wstring(buffer.data());
+    };
+
+    auto executableString = toWString(executable.u8string());
+    auto argsString = toWString(ss.str());
+
+    STARTUPINFOW si = { sizeof(si) };
+    PROCESS_INFORMATION pi = { 0 };
+    DWORD flags = CREATE_NEW_PROCESS_GROUP | DETACHED_PROCESS;
+    // | CREATE_NO_WINDOW;
+    BOOL success = CreateProcessW(
+        executable.u8string().c_str(),
+        argsString.c_str(),
+        nullptr,
+        nullptr,
+        FALSE,
+        flags,
+        nullptr,
+        "",
+        &si,
+        &pi
+    );
+    if (!success) {
+        throw std::runtime_error(
+            "starting an engine instance failed with code: " +
+            std::to_string(GetLastError())
+        );
+    }
+#else
+    std::stringstream ss;
+    ss << executable;
+    for (int i = 0; i < args.size(); i++) {
+        ss << " " << util::quote(args[i]);
+    }
+    ss << " >/dev/null &";
+    
+    auto command = ss.str();
+    if (int res = system(command.c_str())) {
+        throw std::runtime_error(
+            "starting an engine instance failed with code: " +
+            std::to_string(res)
+        );
+    }
+#endif
+}
+
 bool platform::open_url(const std::string& url) {
     if (url.empty()) return false;
 
diff --git a/src/util/platform.hpp b/src/util/platform.hpp
index c4b45650..148c64c4 100644
--- a/src/util/platform.hpp
+++ b/src/util/platform.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <string>
+#include <vector>
 #include <filesystem>
 
 namespace platform {
@@ -16,6 +17,8 @@ namespace platform {
     int get_process_id();
     /// @brief Get current process running executable path  
     std::filesystem::path get_executable_path();
+    /// @brief Run a separate engine instance with specified arguments
+    void new_engine_instance(const std::vector<std::string>& args);
     /// @brief Open URL in web browser 
     bool open_url(const std::string& url);
 }