follow floor miner

local sel=1
turtle.select(sel)
local curcount=turtle.getItemCount(sel)
local prvcount=curcount
local temp
local toggle=true
print("Follow floor miner by Niseg(for Nixaro)")
print("turns right first; follow identical blocks")
print("pre-refuel at least 1 per block not more")
print("identify liquid,climbs mountains(careful!)")
print("hold CTRL-T to stop")
while true do
    if(turtle.digDown()) then
        temp=turtle.getItemCount(sel+1)
        curcount=turtle.getItemCount(sel)
        if temp~=0 then
            if turtle.compareTo(sel+1) then
                sel=sel+1
                turtle.select(sel)
                while not turtle.forward() do turtle.up() end
            else
                turtle.select(sel+1)
                turtle.drop()
                turtle.select(sel)
                turtle.back()
                if toggle then turtle.turnRight() else turtle.turnLeft() end
                while not turtle.forward() do turtle.up() end
                if toggle then turtle.turnRight() else turtle.turnLeft() end
                toggle=not toggle

            end
        else
            if prvcount==curcount then
                turtle.back()
                if toggle then turtle.turnRight() else turtle.turnLeft() end
                while not turtle.forward() do turtle.up() end
                if toggle then turtle.turnRight() else turtle.turnLeft() end
                toggle=not toggle
            else
                while not turtle.forward() do turtle.up() end
            end

        end
        prvcount=curcount
    else
    turtle.down()
    end
end