From cd8a7fe47298be12620cab62be8cf0816fabb095 Mon Sep 17 00:00:00 2001
From: Jude Melton-Houghton <jwmhjwmh@gmail.com>
Date: Tue, 15 Nov 2022 10:45:12 -0500
Subject: Add MetaDataRef:get_keys (#12841)

---
 src/script/lua_api/l_metadata.cpp | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'src/script/lua_api/l_metadata.cpp')

diff --git a/src/script/lua_api/l_metadata.cpp b/src/script/lua_api/l_metadata.cpp
index 8388bc089..68b79331b 100644
--- a/src/script/lua_api/l_metadata.cpp
+++ b/src/script/lua_api/l_metadata.cpp
@@ -24,6 +24,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "serverenvironment.h"
 #include "map.h"
 #include "server.h"
+#include "util/basic_macros.h"
 
 MetaDataRef *MetaDataRef::checkAnyMetadata(lua_State *L, int narg)
 {
@@ -196,6 +197,31 @@ int MetaDataRef::l_set_float(lua_State *L)
 	return 0;
 }
 
+// get_keys(self)
+int MetaDataRef::l_get_keys(lua_State *L)
+{
+	MAP_LOCK_REQUIRED;
+
+	MetaDataRef *ref = checkAnyMetadata(L, 1);
+
+	IMetadata *meta = ref->getmeta(false);
+	if (meta == NULL) {
+		lua_newtable(L);
+		return 1;
+	}
+
+	std::vector<std::string> keys_;
+	const std::vector<std::string> &keys = meta->getKeys(&keys_);
+
+	int i = 0;
+	lua_createtable(L, keys.size(), 0);
+	for (const std::string &key : keys) {
+		lua_pushlstring(L, key.c_str(), key.size());
+		lua_rawseti(L, -2, ++i);
+	}
+	return 1;
+}
+
 // to_table(self)
 int MetaDataRef::l_to_table(lua_State *L)
 {
-- 
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