Exposing id of `om_terrain`/`overmap_special` to LUA

[ZhilkinSerg]

Does someone know how to expose id/name of om_terrain/overmap_special to LUA?

There are following attributes in overmap table:

Cataclysm-DDA/lua/class_definitions.lua

Lines 1860 to 1872 in 59fdf32

	overmap = {
	attributes = {
	},
	functions = {
	{ name = "add_note", rval = nil, args = { "int", "int", "int", "string" } },
	{ name = "clear_mon_groups", rval = nil, args = { } },
	{ name = "delete_note", rval = nil, args = { "int", "int", "int" } },
	{ name = "find_random_omt", rval = "tripoint", args = { "string" } },
	{ name = "has_note", rval = "bool", args = { "int", "int", "int" } },
	{ name = "is_explored", rval = "bool", args = { "int", "int", "int" } },
	{ name = "note", rval = "string", args = { "int", "int", "int" } },
	}
	},

Which attribute and/or function should be added to class_definitions.lua?

Edit by @Leland: moved code to embed

[ZhilkinSerg]

Looking through the source code of catalua.cpp, I've found that terrain type and current turn are already being exposed to global variables tertype and turn, so one can use them like this:

print ("degrading:".._G.tertype.." in turn:"..tostring(_G.turn))
game.add_msg ("degrading:".._G.tertype.." in turn:"..tostring(_G.turn))

It will be also possible to get a rotation of the building as tertype variable contains not only id of the overmap terrain, but also direction suffix (_north, _south, _east or _west).