minetest-mod-sparktech/sparkcore/lua/inventory.lua

--[[local formspec = --template for sparkinventory
	"size[11.4,4]"..
	"list[current_player;main;0,0;8,3;8]" ..
	"list[current_player;main;0,3.2;8,1;]"..
	"list[current_player;craft;8.5,0;3,3]" ..
	"list[current_player;craftpreview;8.5,3.2;1,1]" ..
	"listcolors[#fc059db0;#fc059dd0]"
]]--
minetest.register_on_joinplayer(
	function(player)
		minetest.after(0.01,function()
		player:set_formspec_prepend("")
		player:set_inventory_formspec(sparktech.add_inventory(0, 0, ""))
	end)
end)

local spark_quick_put_machines = minetest.settings:get_bool("spark_quick_put_machines")
local spark_quick_put_storage = minetest.settings:get_bool("spark_quick_put_storage")
local spark_quick_put_default = minetest.settings:get_bool("spark_quick_put_default")
local spark_quick_put_overide = minetest.settings:get("spark_quick_put_overide")

local whitelist 
if spark_quick_put_overide then
	--overide here
	whitelist = { "product" }
else
	if spark_quick_put_machines then
		whitelist = { "fuel", "product", "source" }
	end

	if spark_quick_put_storage then
		if whitelist then
			table.insert(whitelist, "main")
		else
			whitelist = { "main" }
		end
	end

	if spark_quick_put_default then
		if whitelist then
			table.insert(whitelist, "src")
			table.insert(whitelist, "dst")
		end
	end
end

local function quick_refuel(position, node, puncher, pointed)
	local nodemeta = minetest.get_meta(position)
	local noderef = minetest.registered_nodes[node.name]
	if not noderef then return false end
	local putfunc = noderef.allow_metadata_inventory_put
	local itemstack = puncher:get_wielded_item()
	local inventory = nodemeta:get_inventory()
	if not inventory or not putfunc then return false end -- putfunc so grass doesnt crash the game
	for list in pairs(whitelist) do
		local transstack = putfunc(position, whitelist[list], nil, itemstack, puncher)
		if transstack ~= 0 then
			local leftover = inventory:add_item(whitelist[list], itemstack)
			puncher:set_wielded_item(leftover)
			return
		end
	end
end


if whitelist then
	minetest.register_on_punchnode(quick_refuel)
end