rect

function printFuel()
    fuel=turtle.getFuelLevel()
    fuelbar=math.floor(fuel/100)
    if fuelbar>20 then
        fuelbar=20
    end

    term.clear()
    term.setCursorPos(1,1)

    print("------------------------")
    term.write("--")
    for i=1,fuelbar do
        term.write("#")
    end
    for j=fuelbar,19 do
        term.write("=")
    end
    print("--")
    print("------------------------")
    print(fuel.." Steps left")
end

function checkFuel()
    if turtle.getFuelLevel() < 100 then
        turtle.select(16)
        turtle.refuel()
        turtle.select(1)
    end
    printFuel()
end

function df()
    if turtle.detect() then
        turtle.dig()
    end
end

function f()
    while turtle.detect() do
        df()
        sleep(0.5)
    end
    turtle.forward()
    checkFuel()
end

function du()
    if  turtle.detectUp() then
        turtle.digUp()
    end
end

function u()
    while turtle.detectUp() do
        du()
        sleep(0.5)
    end
    turtle.up()
    checkFuel()
end

function r()
    turtle.turnRight()
end

function l()
    turtle.turnLeft()
end

function dd()
    if  turtle.detectDown() then
        turtle.digDown()
    end
end

function d()
    dd()
    turtle.down()
    checkFuel()
end

function main()
    checkFuel()

    term.write("Enter WxH: ")
    WxH=read()

    if string.find(WxH,"x") then
        W=string.sub(WxH,1,string.find(WxH,"x")-1)
        H=string.sub(WxH,string.find(WxH,"x")+1)

        if tonumber(W) and tonumber(H) then
            for i=1,W do
                for j=1,H do
                    f()
                end
                if i%2==1 then
                    r()
                    f()
                    r()
                else
                    l()
                    f()
                    l()
                end
            end
        else
            print("ERR: Not a Number in W or H")
        end
    else
        print("ERR: Wrong Format")
    end
end

main()