Computercraft logging script

-- Logging program
-- Not finished

function check()
    local success, data = turtle.inspect()
    return data.name
end
function checkUp()
    local success, data = turtle.inspectUp()
    return data.name
end
function checkDown()
    local success, data = turtle.inspectDown()
    return data.name
end


if check() == "log" then
    turtle.dig()
    turtle.forward()
    while checkUp() == "log" do
        turtle.digup()
        if check() == "log" then
            turtle.dig()
        end
        turtle.up()
    end
    turtle.turnRight()
    if check() == "log" then                -- check if its a 2x2 tree on the right
        turtle.dig()
        turtle.forward()
        turtle.turnLeft()
        while checkDown() == "log" do
            turtle.digDown()
            if check() == "log" then
                turtle.dig()
            end
            turtle.down()
        end
        if check() == "log" then
            turtle.dig()
        end
    end
    turtle.turnLeft()
    turtle.turnLeft()
    if check() == "log" then                -- check if its a 2x2 tree on the left
        turtle.dig()
        turtle.forward()
        turtle.turnRight()
        while checkDown() == "log" do
            turtle.digDown()
            if check() == "log" then
                turtle.dig()
            end
            turtle.down()
        end
        if check() == "log" then
            turtle.dig()
        end
    else
        turtle.turnLeft()
        while turtle.down()
            -- nothing
        end
    end
    turtle.back()
else
    print("no tree found?")
    print("Place me against a tree please.")
end