ops = {
    "forward",
    "t-right",
    "forward",
    "forward",
    "forward",
    "up",
    "t-left",
    "t-left",
    "forward",
    "forward",
    "forward",
    "down",
    "t-right",
}


function checkFuel()
    local fuelAmount = turtle.getFuelLevel()
    if (fuelAmount < 20) then
        write("Attempting to refuel")
        local refuelSuccess = turtle.refuel(1)
        if (refuelSuccess) then
            write("Refuel success")
        else
            write("Refuel failed")
        end
    end
    return fuelAmount > 0
end

function executeOp(op)
    local fuelOk = checkFuel()
    if not(fuelOk) then
        write("Turtle out of fuel")
        return false
    end
    write("Executing "..op.."\n")

    if op == "forward" then
        turtle.dig()
        if not(turtle.forward()) then
            return false
        end
    elseif op == "up" then
        turtle.digUp()
        if not(turtle.up()) then
            return false
        end
    elseif op == "down" then
        turtle.digDown()
        if not(turtle.down()) then
            return false
        end
    elseif op == "t-right" then
        if not(turtle.turnRight()) then
            return false
        end
    elseif op == "t-left" then
        if not(turtle.turnLeft()) then
            return false
        end
    end
    return true
end


function executeSequence(sequence)
    for key, op in pairs(sequence) do
        if not(executeOp) then
            write("Problem occurred, stopping sequence")
            return false
        end
    end
    return true
end

local result = executeSequence(ops)
write("Exited with status: "..tostring(result))