elepower/elepower_farming/machines/tree_extractor.lua

-- see elepower_papi >> external_nodes_items.lua for explanation
-- shorten table ref
local epi = ele.external.ing

local CAPACITY = 8000

local fluid_table = {
	[epi.tree]        = { fpc = 100, fluid = "elepower_farming:tree_sap_source" },
	[epi.jungle_tree]  = { fpc = 50,  fluid = "elepower_farming:resin_source" },
	[epi.pine_tree]   = { fpc = 100, fluid = "elepower_farming:resin_source" },
	[epi.acacia_tree] = { fpc = 50,  fluid = "elepower_farming:resin_source" },
	[epi.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 buffer = fluid_lib.get_buffer_data(pos, "tree")
		if not buffer or buffer.amount == buffer.capacity then return end

		local fpos   = ele.helpers.face_front(pos, node.param2)
		local amount = 0
		local ftype  = buffer.fluid
		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
				amount = fdata.fpc
				ftype = fdata.fluid
			end
		end

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

		local give = 0
		if buffer.amount + amount > buffer.capacity then
			give = buffer.capacity - buffer.amount
		else
			give = amount
		end

		buffer.amount = buffer.amount + give
		buffer.fluid  = ftype

		meta:set_int("tree_fluid_storage", buffer.amount)
		meta:set_string("tree_fluid", buffer.fluid)
		meta:set_string("infotext", fluid_lib.buffer_to_string(buffer))
	end
})

fluid_lib.register_node("elepower_farming:tree_extractor")