refuel

local NUM_SLOTS = 16
local MAX_STACK_SIZE = 64
local args = { ... }

function refuelFromLocalInventory()
    print("Refueling...")

    for i = 1, NUM_SLOTS do
        turtle.select(i)
        turtle.refuel(MAX_STACK_SIZE)
    end

    turtle.select(1)
    fuelLevel = turtle.getFuelLevel()
    print("Refueled to " .. fuelLevel .. "/" .. turtle.getFuelLimit())

    return fuelLevel
end

function refuelFromContainer(suckDirection, dropDirection)
    local sucks = {
        ["front"] = turtle.suck,
        ["up"] = turtle.suckUp,
        ["down"] = turtle.suckDown
    }
    local suck = sucks[suckDirection]

    local drops = {
        ["front"] = turtle.drop,
        ["up"] = turtle.dropUp,
        ["down"] = turtle.dropDown
    }
    local drop = drops[dropDirection]

    for i = 1, NUM_SLOTS do
        drop() -- empty inventory into drop container
    end

    -- refuel from suck container as much as possible
    while suck() do
        if not turtle.refuel(MAX_STACK_SIZE) then
            drop() -- not combustible, so drop it
        end
    end
end

refuelFromLocalInventory("front", "up")