miner

local length = 100

local fuelNeeded = (((length*3)*2)*3)+27)


local function fillUp()
    while (turtle.getFuelLevel() < fuelNeeded) do
        turtle.select(1)
        if (turtle.getItemCount(1) == 0) then
            print("Please supply fuel in slot 1!")
            return false
        end
        turtle.refuel(1)
    end
    return true
end


local function torchCheck()
    if (((length / 3) * 2) > turtle.getItemCount(2)) then
        print("Please feed me torches in slot 2!")
        return false
    end
    return true
end


local function makeLight()
    turtle.select(2)
    turtle.turnLeft()
    turtle.place()
    turtle.turnRight()
end


local function dig()
    while (turtle.detect()) do
        turtle.dig()
        sleep(0.5)
    end
end


local function makeTunnel()
    local lengthComp = 0
    local torchplace = 0

    while (i < length) do
        dig()
        turtle.up()
        dig()
        turtle.forward()
        turtle.down()

        if lengthComp % 10 == 0 then
            makeLight()
        end

        lengthComp = lengthComp + 1
    end
end


local function overARow()
    local newRow = 0

    turtle.turnLeft()

    while (newRow < 3) do
        dig()
        turtle.down()
        dig()
        turtle.forward()
        turtle.up()
        newRow = newRow + 1
    end

    turtle.turnRight()
end


local function backToStart()
    local comeBack = 0

    turtle.turnRight()
    turtle.turnRight()

    while (comeBack < length) do
        turtle.forward()
        comeBack = comeBack + 1
    end

    turtle.turnRight()
    turtle.turnRight()
end


local function checkInventory()
    local inventory = 0
    local slotsFull = 0

    while (inventory < 16) do
        inventory = inventory + 1
        slotStatus = turtle.getItemCount(inventory)
        if (slotStatus > 0) then
            slotsFull = slotsFull + 1
        end
    end

    if (slotsFull == 16) then
        return false
    end

    return true
end


local function returnHome()
    local i = 0

    turtle.turnLeft()

    while (i < 3) do
        turtle.forward()
        i = i + 1
    end
end

if fillUp() and torchCheck() then
    local rowsFromStart = 0

    while checkInventory()
        makeTunnel()
        backToStart()
        overARow()
        rowsFromStart = rowsFromStart + 1
    end

    if (rowsFromStart > 1) then
        while (returnToHome < rowsFromStart) do
            returnHome()
  end
 end
end