add Duel.GrabSelectedCard (#199)

for Group.SelectSubGroup in utility.lua

interpreter.cpp

@@ -509,6 +509,7 @@ static const struct luaL_Reg duellib[] = {
 	{ "ReleaseRitualMaterial", scriptlib::duel_release_ritual_material },
 	{ "GetFusionMaterial", scriptlib::duel_get_fusion_material },
 	{ "SetSelectedCard", scriptlib::duel_set_must_select_cards },
+	{ "GrabSelectedCard", scriptlib::duel_grab_must_select_cards },
 	{ "SetTargetCard", scriptlib::duel_set_target_card },
 	{ "ClearTargetCard", scriptlib::duel_clear_target_card },
 	{ "SetTargetPlayer", scriptlib::duel_set_target_player },

libduel.cpp

@@ -2798,6 +2798,15 @@ int32 scriptlib::duel_set_must_select_cards(lua_State *L) {
 		luaL_error(L, "Parameter %d should be \"Card\" or \"Group\".", 1);
 	return 0;
 }
+int32 scriptlib::duel_grab_must_select_cards(lua_State *L) {
+	duel* pduel = interpreter::get_duel_info(L);
+	group* pgroup = pduel->new_group();
+	if(pduel->game_field->core.must_select_cards.size())
+		pgroup->container.insert(pduel->game_field->core.must_select_cards.begin(), pduel->game_field->core.must_select_cards.end());
+	pduel->game_field->core.must_select_cards.clear();
+	interpreter::group2value(L, pgroup);
+	return 1;
+}
 int32 scriptlib::duel_set_target_card(lua_State *L) {
 	check_action_permission(L);
 	check_param_count(L, 1);

scriptlib.h

@@ -503,6 +503,7 @@ public:
 	static int32 duel_release_ritual_material(lua_State *L);
 	static int32 duel_get_fusion_material(lua_State *L);
 	static int32 duel_set_must_select_cards(lua_State *L);
+	static int32 duel_grab_must_select_cards(lua_State *L);
 	static int32 duel_set_target_card(lua_State *L);
 	static int32 duel_clear_target_card(lua_State *L);
 	static int32 duel_set_target_player(lua_State *L);