Tunnel Draft Three

local tArgs = { ... }
if #tArgs ~= 1 then
    print( "Usage: tunnel <width>" )
    return
end
local width = tonumber( tArgs[1] )
if width < 1 then
    print( "Tunnel Width must be positive" )
    return
end

local move = 0

print("Tunnelling...")
loop = 1
while loop == 1 do
    move = width

    --Start
    if turtle.detect() then
        turtle.dig()
        turtle.forward()
    else
        turtle.forward()
    end
    turtle.turnLeft

    --Side Movement
    while move > 0 do
        if turtle.detectDown() then
            turtle.digDown()
        end
        if turtle.detect() then
            turtle.dig()
            turtle.forward()
            move = move - 1
        else
            turtle.forward()
            move = move - 1
        end
    end
end