From 0680c47d6c7d3e98e2b96b823f8cc9ca76d5e7f8 Mon Sep 17 00:00:00 2001
From: rubenwardy <rubenwardy@gmail.com>
Date: Sun, 5 Feb 2017 18:15:46 +0000
Subject: [PATCH] Fix incompatibility of ItemStack.to_table() introduced by
 stack meta

---
 src/script/common/c_content.cpp | 15 +++++++++++++++
 src/script/lua_api/l_item.cpp   | 28 +++++++++++++---------------
 2 files changed, 28 insertions(+), 15 deletions(-)

diff --git a/src/script/common/c_content.cpp b/src/script/common/c_content.cpp
index 8925b51f..399aa88d 100644
--- a/src/script/common/c_content.cpp
+++ b/src/script/common/c_content.cpp
@@ -848,6 +848,21 @@ ItemStack read_item(lua_State* L, int index,Server* srv)
 			istack.metadata.setString("", value);
 		}
 
+		lua_getfield(L, index, "meta");
+		fieldstable = lua_gettop(L);
+		if (lua_istable(L, fieldstable)) {
+			lua_pushnil(L);
+			while (lua_next(L, fieldstable) != 0) {
+				// key at index -2 and value at index -1
+				std::string key = lua_tostring(L, -2);
+				size_t value_len;
+				const char *value_cs = lua_tolstring(L, -1, &value_len);
+				std::string value(value_cs, value_len);
+				istack.metadata.setString(name, value);
+				lua_pop(L, 1); // removes value, keeps key for next iteration
+			}
+		}
+
 		return istack;
 	} else {
 		throw LuaError("Expecting itemstack, itemstring, table or nil");
diff --git a/src/script/lua_api/l_item.cpp b/src/script/lua_api/l_item.cpp
index f0293bed..9638740e 100644
--- a/src/script/lua_api/l_item.cpp
+++ b/src/script/lua_api/l_item.cpp
@@ -225,23 +225,21 @@ int LuaItemStack::l_to_table(lua_State *L)
 		lua_pushinteger(L, item.wear);
 		lua_setfield(L, -2, "wear");
 
-		if (item.metadata.size() == 1 && item.metadata.contains("")) {
-			const std::string &value = item.metadata.getString("");
+		const std::string &metadata_str = item.metadata.getString("");
+		lua_pushlstring(L, metadata_str.c_str(), metadata_str.size());
+		lua_setfield(L, -2, "metadata");
+
+		lua_newtable(L);
+		const StringMap &fields = item.metadata.getStrings();
+		for (StringMap::const_iterator it = fields.begin();
+				it != fields.end(); ++it) {
+			const std::string &name = it->first;
+			const std::string &value = it->second;
+			lua_pushlstring(L, name.c_str(), name.size());
 			lua_pushlstring(L, value.c_str(), value.size());
-			lua_setfield(L, -2, "metadata");
-		} else {
-			lua_newtable(L);
-			const StringMap &fields = item.metadata.getStrings();
-			for (StringMap::const_iterator it = fields.begin();
-					it != fields.end(); ++it) {
-				const std::string &name = it->first;
-				const std::string &value = it->second;
-				lua_pushlstring(L, name.c_str(), name.size());
-				lua_pushlstring(L, value.c_str(), value.size());
-				lua_settable(L, -3);
-			}
-			lua_setfield(L, -2, "metadata");
+			lua_settable(L, -3);
 		}
+		lua_setfield(L, -2, "meta");
 	}
 	return 1;
 }