Basic Turtle Movements (save as move)

-- tries to refuel till possible
local function refuelProcess()
    local cnt = 0
    local bFueld = false
    local slot = turtle.getSelectedSlot()
    while not bFueld do
        for i = 1, 16, 1 do
            turtle.select(i)
            local item = turtle.getItemDetail()
            if item then
                if not (item.name == "minecraft:chest") then
                    local ok, err = turtle.refuel()
                end
            end
        end
        if turtle.getFuelLevel() > 0 then
            print("New fuel level:   " .. tostring(turtle.getFuelLevel()))
            turtle.select(slot)
            return true
        end
        if cnt == 0 then
            print("Pls enter fuel to continue")
        end
        cnt = 1
    end
    turtle.select(slot)
    return true
end

-- Checks if fuel is available or starts refuel process
local function fuelCheck()
    if turtle.getFuelLevel() > 0 then
        return
    else
        refuelProcess()
    end
end

-- Digs in given direction till turtle can move
local function Forward()
    fuelCheck()

    local b = false
    while not b do
        b = turtle.forward()
        if not b then
            turtle.dig()
        end
    end
end
local function Up()
    fuelCheck()

    local b = false
    while not b do
        b = turtle.up()
        if not b then
            turtle.digUp()
        end
    end
end
local function Down()
    fuelCheck()

    local b = false
    while not b do
        b = turtle.down()
        if not b then
            turtle.digDown()
        end
    end
end

-- Turn turtle 180°
local function turnBack()
    turtle.turnLeft()
    turtle.turnLeft()
end

return { Forward = Forward, Up = Up, Down = Down, turnBack = turnBack }