creative_regions/mod_areas.lua

--[[
function creative_regions:is_areas_mod(area_id)
	assert(type(area_id) == "string")
	local is_areas_id = string.sub(id, 1, 2) == "a"
	local a_id = tonumber( string.sub(id, 2) )
	return is_areas_id, a_id
end
--]]

function creative_regions:get_areas_area_size(areas_area)
	local pos1 = areas_area.pos1
	local pos2 = areas_area.pos2
	local x = math.abs( pos2.x - pos1.x )
	local z = math.abs( pos2.z - pos1.z )
	local y = math.abs( pos2.y - pos1.y )
	return x*z*y
end

if minetest.get_modpath("areas") then

-- remove protector blocks on area removal
	areas:registerOnRemove(function(id)
		local area = areas.areas[id]
		local area_id = "a"..tostring(id)
		creative_regions.set_region_privs(area_id, nil)
		creative_regions.save_regions()
		if creative_regions:get_areas_area_size(area) > 4096000 then
			minetest.log("warning", "[creative_regions] area " .. area_id .. " too big. Can't search for Protector Blocks")
			return
		end
		local protectors_in_area = minetest.find_nodes_in_area(area.pos1, area.pos2, {"creative_regions:protector_nofly", "creative_regions:protector_arena"})
		for _, pos in ipairs(protectors_in_area) do
			local meta = minetest.get_meta(pos)
			local stored_id = meta:get_string("area_id")
			local privstring = meta:get_string("privstring")
			local owner = meta:get_string("owner")

			if stored_id == area_id then
				minetest.remove_node(pos)
				minetest.chat_send_player(owner, "[creative_regions] Protector Blocks removed for removed area " .. area_id)
			end
		end
	end)

-- areas mod hud
	local function areas_hud_handler(pos, areas)
		local current_regions = creative_regions.astore:get_areas_for_pos(pos, false, true)
		for astore_id, astore_area in pairs( current_regions ) do
			if astore_id then
				table.insert(areas, {
					id = "region:"..astore_id,
					name = astore_area.data,
					--owner = "",
				})
			end
		end
	end

	areas:registerHudHandler(areas_hud_handler)

end