add advanced lua errors handler & fix hud script source path in traceback

res/scripts/stdmin.lua

@@ -307,3 +307,10 @@ function __scripts_cleanup()
         end
     end
 end
+
+function __vc__error(msg, frame)
+    if events then
+        events.emit("core:error", msg, debug.get_traceback(1))
+    end
+    return debug.traceback(msg, frame)
+end

src/frontend/screens/LevelScreen.cpp

@@ -83,7 +83,12 @@ void LevelScreen::initializePack(ContentPackRuntime* pack) {
     const ContentPack& info = pack->getInfo();
     fs::path scriptFile = info.folder/fs::path("scripts/hud.lua");
     if (fs::is_regular_file(scriptFile)) {
-        scripting::load_hud_script(pack->getEnvironment(), info.id, scriptFile);
+        scripting::load_hud_script(
+            pack->getEnvironment(),
+            info.id,
+            scriptFile,
+            pack->getId() + ":scripts/hud.lua"
+        );
     }
 }
 

src/logic/scripting/lua/lua_util.cpp

@@ -145,10 +145,14 @@ static int l_error_handler(lua_State* L) {
     if (!isstring(L, 1)) {  // 'message' not a string?
         return 1;           // keep it intact
     }
-    if (get_from(L, "debug", "traceback")) {
+    if (getglobal(L, "__vc__error")) {
         lua_pushvalue(L, 1);    // pass error message
         lua_pushinteger(L, 2);  // skip this function and traceback
         lua_call(L, 2, 1);      // call debug.traceback
+    } if (get_from(L, "debug", "traceback")) {
+        lua_pushvalue(L, 1);
+        lua_pushinteger(L, 2);
+        lua_call(L, 2, 1);
     }
     return 1;
 }
@@ -172,8 +176,13 @@ int lua::call_nothrow(State* L, int argc, int nresults) {
     pushcfunction(L, l_error_handler);
     insert(L, handler_pos);
     if (lua_pcall(L, argc, LUA_MULTRET, handler_pos)) {
-        log_error(tostring(L, -1));
+        auto errorstr = tostring(L, -1);
+        if (errorstr) {
+            log_error(errorstr);
             pop(L);
+        } else {
+            log_error("");
+        }
         remove(L, handler_pos);
         return 0;
     }

src/logic/scripting/scripting_hud.cpp

@@ -76,13 +76,16 @@ void scripting::on_frontend_close() {
 }
 
 void scripting::load_hud_script(
-    const scriptenv& senv, const std::string& packid, const fs::path& file
+    const scriptenv& senv,
+    const std::string& packid,
+    const fs::path& file,
+    const std::string& fileName
 ) {
     int env = *senv;
     std::string src = files::read_string(file);
     logger.info() << "loading script " << file.u8string();
 
-    lua::execute(lua::get_main_state(), env, src, file.u8string());
+    lua::execute(lua::get_main_state(), env, src, fileName);
 
     register_event(env, "init", packid + ":.init");
     register_event(env, "on_hud_open", packid + ":.hudopen");

src/logic/scripting/scripting_hud.hpp

@@ -22,7 +22,11 @@ namespace scripting {
     /// @param env environment id
     /// @param packid content-pack id
     /// @param file script file path
+    /// @param fileName script file path using the engine format
     void load_hud_script(
-        const scriptenv &env, const std::string &packid, const fs::path &file
+        const scriptenv& env,
+        const std::string& packid,
+        const fs::path& file,
+        const std::string& fileName
     );
 }