From efa460599d37b40a8b9d707096943a543be6db78 Mon Sep 17 00:00:00 2001
From: Eugene Sandulenko
Date: Thu, 6 Jun 2019 00:58:13 +0200
Subject: HDB: Added quick & dirty Lua tracing

---
 engines/hdb/lua-script.cpp | 48 +++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 45 insertions(+), 3 deletions(-)

diff --git a/engines/hdb/lua-script.cpp b/engines/hdb/lua-script.cpp
index 184ff474dd..dd6c8b0f17 100644
--- a/engines/hdb/lua-script.cpp
+++ b/engines/hdb/lua-script.cpp
@@ -696,17 +696,59 @@ bool LuaScript::executeFile(const Common::String &filename) {
 }
 #endif
 
+namespace {
+int panicCB(lua_State *L) {
+        error("Lua panic. Error message: %s", lua_isnil(L, -1) ? "" : lua_tostring(L, -1));
+        return 0;
+}
+
+void debugHook(lua_State *L, lua_Debug *ar) {
+        if (!lua_getinfo(L, "Sn", ar))
+                return;
+
+        debug("LUA: %s %s: %s %d", ar->namewhat, ar->name, ar->short_src, ar->currentline);
+}
+}
+
 bool LuaScript::executeChunk(const char *chunk, uint chunkSize, const Common::String &chunkName) const {
-	
+
 	if (!_systemInit) {
 		return false;
 	}
-	
+
+	lua_atpanic(_state, panicCB);
+
+	const char errorHandlerCode[] =
+		"local function ErrorHandler(message) "
+		"   return message .. '\\n' .. debug.traceback('', 2) "
+		"end "
+		"return ErrorHandler";
+
+	if (luaL_loadbuffer(_state, errorHandlerCode, strlen(errorHandlerCode), "PCALL ERRORHANDLER") != 0) {
+                // An error occurred, so dislay the reason and exit
+                error("Couldn't compile luaL_pcall errorhandler:\n%s", lua_tostring(_state, -1));
+                lua_pop(_state, 1);
+
+                return false;
+        }
+
+
+		// Running the code, the error handler function sets the top of the stack
+	        if (lua_pcall(_state, 0, 1, 0) != 0) {
+	                // An error occurred, so dislay the reason and exit
+	                error("Couldn't prepare luaL_pcall errorhandler:\n%s", lua_tostring(_state, -1));
+	                lua_pop(_state, 1);
+
+	                return false;
+	        }
+
+	lua_sethook(_state, debugHook, LUA_MASKCALL | LUA_MASKLINE, 0);
+
 	// Compile Chunk
 	if (luaL_loadbuffer(_state, chunk, chunkSize, chunkName.c_str())) {
 		error("Couldn't compile \"%s\": %s", chunkName.c_str(), lua_tostring(_state, -1));
 		lua_pop(_state, -1);
-		
+
 		return false;
 	}
 
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