From 16696823242ca3b82d932542899e77894238fa2c Mon Sep 17 00:00:00 2001
From: Elias Fleckenstein <eliasfleckenstein@web.de>
Date: Thu, 18 Feb 2021 20:20:22 +0100
Subject: [PATCH] Port formspec API from waspsaliva This API is inofficial and
 undocumented; invalid usage causes the game to crash. Use at own risk!

---
 src/script/lua_api/l_client.cpp | 44 +++++++++++++++++++++++++++++++++
 src/script/lua_api/l_client.h   |  6 +++++
 2 files changed, 50 insertions(+)

diff --git a/src/script/lua_api/l_client.cpp b/src/script/lua_api/l_client.cpp
index abd27f7dc..484af2ec3 100644
--- a/src/script/lua_api/l_client.cpp
+++ b/src/script/lua_api/l_client.cpp
@@ -621,6 +621,48 @@ int ModApiClient::l_interact(lua_State *L)
 	return 1;
 }
 
+StringMap *table_to_stringmap(lua_State *L, int index)
+{
+	StringMap *m = new StringMap;
+
+	lua_pushvalue(L, index);
+	lua_pushnil(L);
+
+	while (lua_next(L, -2)) {
+		lua_pushvalue(L, -2);
+		std::basic_string<char> key = lua_tostring(L, -1);
+		std::basic_string<char> value = lua_tostring(L, -2);
+		(*m)[key] = value;
+		lua_pop(L, 2);
+	}
+
+	lua_pop(L, 1);
+
+	return m;
+}
+
+// send_inventory_fields(formname, fields)
+// Only works if the inventory form was opened beforehand.
+int ModApiClient::l_send_inventory_fields(lua_State *L)
+{
+	std::string formname = luaL_checkstring(L, 1);
+	StringMap *fields = table_to_stringmap(L, 2);
+
+	getClient(L)->sendInventoryFields(formname, *fields);
+	return 0;
+}
+
+// send_nodemeta_fields(position, formname, fields)
+int ModApiClient::l_send_nodemeta_fields(lua_State *L)
+{
+	v3s16 pos = check_v3s16(L, 1);
+	std::string formname = luaL_checkstring(L, 2);
+	StringMap *m = table_to_stringmap(L, 3);
+
+	getClient(L)->sendNodemetaFields(pos, formname, *m);
+	return 0;
+}
+
 void ModApiClient::Initialize(lua_State *L, int top)
 {
 	API_FCT(get_current_modname);
@@ -657,4 +699,6 @@ void ModApiClient::Initialize(lua_State *L, int top)
 	API_FCT(get_objects_inside_radius);
 	API_FCT(make_screenshot);
 	API_FCT(interact);
+	API_FCT(send_inventory_fields);
+	API_FCT(send_nodemeta_fields);
 }
diff --git a/src/script/lua_api/l_client.h b/src/script/lua_api/l_client.h
index 03a42e022..caf21f78e 100644
--- a/src/script/lua_api/l_client.h
+++ b/src/script/lua_api/l_client.h
@@ -132,6 +132,12 @@ private:
 	// interact(action, pointed_thing)
 	static int l_interact(lua_State *L);
 
+	// send_inventory_fields(formname, fields)
+	static int l_send_inventory_fields(lua_State *L);
+
+	// send_nodemeta_fields(position, formname, fields)
+	static int l_send_nodemeta_fields(lua_State *L);
+
 public:
 	static void Initialize(lua_State *L, int top);
 };