add engine pause mode

src/devtools/DebuggingServer.cpp

@@ -168,6 +168,15 @@ bool DebuggingServer::performCommand(
 void DebuggingServer::onHitBreakpoint(dv::value&& stackTrace) {
     logger.info() << "hit breakpoint:\n"
                   << json::stringify(stackTrace, true, "    ");
+    if (connection == nullptr) {
+        return;
+    }
+    connection->send(dv::object({
+        {"type", std::string("hit-breakpoint")},
+        {"stack", std::move(stackTrace)}
+    }));
+
+    engine.startPauseLoop();
 }
 
 void DebuggingServer::setClient(u64id_t client) {

src/engine/Engine.cpp

@@ -309,6 +309,30 @@ void Engine::nextFrame() {
     input->pollEvents();
 }
 
+void Engine::startPauseLoop() {
+    bool initialCursorLocked = false;
+    if (!isHeadless()) {
+        initialCursorLocked = input->isCursorLocked();
+        if (initialCursorLocked) {
+            input->toggleCursor();
+        }
+    }
+    while (!isQuitSignal()) {
+        if (!debuggingServer->update()) {
+            debuggingServer.reset();
+            break;
+        }
+        if (isHeadless()) {
+            platform::sleep(1.0 / params.tps * 1000);
+        } else {
+            nextFrame();
+        }
+    }
+    if (initialCursorLocked) {
+        input->toggleCursor();
+    }
+}
+
 void Engine::renderFrame() {
     screen->draw(time.getDelta());
 

src/engine/Engine.hpp

@@ -108,6 +108,7 @@ public:
     void updateFrontend();
     void renderFrame();
     void nextFrame();
+    void startPauseLoop();
     
     /// @brief Set screen (scene).
     /// nullptr may be used to delete previous screen before creating new one,

src/logic/scripting/lua/lua_extensions.cpp

@@ -164,30 +164,7 @@ static int l_math_normal_random(lua::State* L) {
 
 constexpr inline int MAX_SHORT_STRING_LEN = 50;
 
-static dv::value create_stack_trace(lua_State* L, int initFrame = 2) {
+static dv::value collect_locals(lua::State* L, lua_Debug& frame) {
-    auto entriesList = dv::list();
-
-    lua_Debug frame;
-    int level = initFrame;
-    
-    while (lua_getstack(L, level, &frame)) {
-        auto entry = dv::object();
-        if (lua_getinfo(L, "nSlf", &frame) == 0) {
-            level++;
-            entriesList.add(std::move(entry));
-            continue;
-        }
-        if (frame.name) {
-            entry["function"] = frame.name;
-        }
-        if (frame.source) {
-            const char* src =
-                (frame.source[0] == '@') ? frame.source + 1 : frame.source;
-            entry["source"] = src;
-            entry["line"] = frame.currentline;
-        }
-        entry["what"] = frame.what;
-
     auto locals = dv::object();
 
     int localIndex = 1;
@@ -262,7 +239,33 @@ static dv::value create_stack_trace(lua_State* L, int initFrame = 2) {
         locals[name] = std::move(local);
         lua::pop(L);
     }
-        entry["locals"] = std::move(locals);
+    return locals;
+}
+
+static dv::value create_stack_trace(lua::State* L, int initFrame = 2) {
+    auto entriesList = dv::list();
+
+    lua_Debug frame;
+    int level = initFrame;
+    
+    while (lua_getstack(L, level, &frame)) {
+        auto entry = dv::object();
+        if (lua_getinfo(L, "nSlf", &frame) == 0) {
+            level++;
+            entriesList.add(std::move(entry));
+            continue;
+        }
+        if (frame.name) {
+            entry["function"] = frame.name;
+        }
+        if (frame.source) {
+            const char* src =
+                (frame.source[0] == '@') ? frame.source + 1 : frame.source;
+            entry["source"] = src;
+            entry["line"] = frame.currentline;
+        }
+        entry["what"] = frame.what;
+        entry["locals"] = collect_locals(L, frame);
         entriesList.add(std::move(entry));
         level++;
     }