elepower/elepower_farming/nodes/tree_extractor.lua

local CAPACITY = 8000

local fluid_table = {
	["default:tree"]        = { fpc = 100, fluid = "elepower_farming:tree_sap_source" },
	["default:jungletree"]  = { fpc = 50,  fluid = "elepower_farming:resin_source" },
	["default:pine_tree"]   = { fpc = 100, fluid = "elepower_farming:resin_source" },
	["default:acacia_tree"] = { fpc = 50,  fluid = "elepower_farming:resin_source" },
	["default:aspen_tree"]  = { fpc = 50,  fluid = "elepower_farming:resin_source" },
}

minetest.register_node("elepower_farming:tree_extractor", {
	description = "Tree Fluid Extractor",
	groups = {fluid_container = 1, oddly_breakable_by_hand = 1, cracky = 1},
	tiles = {
		"elefarming_machine_base.png", "elefarming_machine_base.png", "elefarming_machine_side.png",
		"elefarming_machine_side.png", "elefarming_machine_side.png^elepower_power_port.png", 
		"elefarming_machine_tree_extractor.png",
	},
	fluid_buffers = {
		tree = {
			capacity = CAPACITY
		}
	},
	paramtype2 = "facedir"
})

minetest.register_abm({
	nodenames = {"elepower_farming:tree_extractor"},
	label = "elefluidSapAccumulator",
	interval   = 8,
	chance     = 1/6,
	action = function(pos, node, active_object_count, active_object_count_wider)
		local meta    = minetest.get_meta(pos)
		local fluid_c = meta:get_int("tree_fluid_storage")
		if fluid_c == CAPACITY then return end

		local fpos  = ele.helpers.face_front(pos, node.param2)
		local fluid = 0
		local ftype = meta:get_string("tree_fluid")
		local fname = "Tree Sap"
		local fnode = minetest.get_node_or_nil(fpos)
		if fnode and ele.helpers.get_item_group(fnode.name, "tree") then
			local fdata = fluid_table[fnode.name]
			if fdata and (ftype == "" or ftype == fdata.fluid) then
				fluid = fdata.fpc
				ftype = fdata.fluid
				fname = minetest.registered_nodes[ftype].description:gsub(" Source", "")
			end
		end

		if fluid == 0 then
			meta:set_string("infotext", "Place me in front of a tree!")
			return
		end

		local give = 0
		if fluid_c + fluid > CAPACITY then
			give = CAPACITY - fluid_c
		else
			give = fluid
		end

		fluid_c = fluid_c + give

		meta:set_int("tree_fluid_storage", fluid_c)
		meta:set_string("tree_fluid", ftype)
		meta:set_string("infotext", ("%s: %d/%d %s"):format(fname, fluid_c, CAPACITY, elefluid.unit))
	end
})