ultMiner

print('How far should I go?')
distance = io.read()
print('How wide? [1]')
width = tonumber(io.read())
print('how tall? [0]')
height = tonumber(io.read())

function addHeight()
    for i = 0, height do
        turtle.digUp()
        turtle.up()  -- additional layer
        turtle.dig()
        turtle.turnLeft()
        turtle.dig()
        turtle.turnRight()
        turtle.turnRight()
        turtle.dig()
        turtle.turnLeft()
    end
    for p = 0, height do
        turtle.down()
    end
    turtle.down()
    turtle.down()
end

function mine ()
    t=1
    for i=1, distance do
        turtle.dig() -- layer 1
        turtle.forward()
        turtle.turnLeft()
        turtle.dig()
        turtle.turnRight()
        turtle.turnRight()
        turtle.dig()
        turtle.turnLeft()
        turtle.digUp()

        turtle.up() -- layer 2
        turtle.dig()
        turtle.digUp()
        turtle.turnLeft()
        turtle.dig()
        if t==5 then
            turtle.select(16)
            turtle.place()
        end
        turtle.turnRight()
        turtle.turnRight()
        turtle.dig()
        if t==5 then
            turtle.select(16)
            turtle.place()
            t=1
        end
        turtle.turnLeft()
        turtle.digUp()
        turtle.up()  -- layer 3
        turtle.dig()
        turtle.turnLeft()
        turtle.dig()
        turtle.turnRight()
        turtle.turnRight()
        turtle.dig()
        turtle.turnLeft()
        addHeight()
        t=t+1
        print('T = ' .. t)
        os.sleep(0)
        print('Refueling...')
        for slot = 1,16 do
            item = turtle.getItemDetail(slot)
            if item ~=nil and item['name'] == 'minecraft:coal' then
                turtle.select(slot)
            end
            while turtle.getFuelLevel() <= 800 do
                if turtle.refuel() then
                    print('Fuel level is: ' .. turtle.getFuelLevel())
                else
                    print('Not enough fuel')
                    break
                end
            end
        end
    end
end

if width > 1 then
    marker=1
    mine()
else
    marker=0
    mine()
end
    for i=1, width do -- how many times to turn
        if marker==1 then --turn right
            turtle.turnRight()
            turtle.forward()
            turtle.dig()
            turtle.forward()
            turtle.dig()
            turtle.forward()
            turtle.turnRight()
            mine()
            marker=2
        elseif marker == 2 then -- turn left
            turtle.turnLeft()
            turtle.forward()
            turtle.dig()
            turtle.forward()
            turtle.dig()
            turtle.forward()
            turtle.turnLeft()
            mine()
            marker=1
        end
    end