Turtle Tunnel

local function placeTorch()
    for slot = 1, 16 do
        local itemDetail = turtle.getItemDetail(slot)
        if itemDetail and itemDetail.name == "minecraft:torch" then
            turtle.select(slot)
            if turtle.placeDown() then
                return true
            end
        end
    end
    return false
end

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

local function mineTunnel(length)
    -- Check if length is valid
    if length < 1 then
        print("Length must be greater than zero.")
        return
    end

    local torchCounter = 0

    -- Mine the tunnel
    for i = 1, length do
        checkAndDig()
        turtle.forward()
        turtle.digUp()
        turtle.digDown()

        -- Increment torch counter
        torchCounter = torchCounter + 1

        -- Place torch every 10 blocks
        if torchCounter == 10 then
            if not placeTorch() then
                print("No torches left to place!")
            end
            torchCounter = 0
        end

        -- Mine the left side of the tunnel
        turtle.turnLeft()
        checkAndDig()
        turtle.forward()
        turtle.digUp()
        turtle.digDown()
        turtle.turnRight()

        -- Move to the right side of the tunnel
        turtle.turnRight()
        turtle.forward()
        checkAndDig()
        turtle.forward()
        turtle.digUp()
        turtle.digDown()
        turtle.turnLeft()

        -- Return to original orientation
        turtle.turnLeft()
        turtle.forward()
        turtle.turnRight()

        -- Move to the next row
        if i < length then
            turtle.forward()
        end
    end
end

-- Main program
local args = {...}
local length = tonumber(args[1])

if not length then
    print("Usage: tunnel <length>")
    return
end

mineTunnel(length)