Minetest Doors

local boxes = {
	["_b"] = {
			selection_box = {type = "fixed", fixed = {-32/64,-1/2,-4/64,32/64,3/2,4/64}},
			collision_box = {type = "fixed", fixed = {-32/64,-1/2,-4/64,32/64,3/2,4/64}}
		},
	["_a"] = {
			selection_box = {type = "fixed", fixed = {-2/2,-1/2,-32/64,0/64,3/2,-24/64}},
			collision_box = {type = "fixed", fixed = {-2/2,-1/2,-32/64,0/64,3/2,-24/64}}
		}
}

function string:split(sep)
   local sep, fields = sep or ":", {}
   local pattern = string.format("([^%s]+)", sep)
   self:gsub(pattern, function(c) fields[#fields+1] = c end)
   return fields
end

for name, _ in pairs(minetest.registered_nodes) do
	if not name:match(":") then
		return
	end

	if string.sub(name:split(":")[2],1,4) == "door" then
		minetest.debug( "NAME:", name )
		minetest.override_item( name, boxes[string.sub(name,-2)] or {} )
	end
end