treecutter

-- VARIABLE(s)

n1 = 0

-- FUNCTION(s)

function refuel(gas)
    if turtle.getFuelLevel() < gas then
        for r = 1, 16 do
            if turtle.getItemCount(r) > 0 then
                turtle.select(r)
                repeat
                    if not turtle.refuel(1) then
                        return
                    end
                until turtle.getFuelLevel() > gas or turtle.getItemCount == 0
            end
        end
    end
end


-- CODE

if not turtle.dig() then
    return print("error. tree not detected")
end

refuel(1)
turtle.forward()

if not turtle.detect() then
    tree = 1
end

if tree ~= 1 then
    turtle.turnLeft()
    if turtle.detect() then
        tree = "left"
    end
    turtle.turnRight()
    if tree ~= "left" then
        turtle.turnRight()
        if turtle.detect() then
            tree = "right"
        end
        turtle.turnLeft()
    end
end

while turtle.digUp() do
    if tree ~= 1 then
        turtle.dig()
    end
    refuel(10)
    turtle.up()
    n1 = n1+1
end

if tree == "left" then
    turtle.turnLeft()
    turtle.dig()
    turtle.forward()
    turtle.turnRight()
elseif tree == "right" then
    turtle.turnRight()
    turtle.dig()
    turtle.forward()
    turtle.turnLeft()
else
    refuel(n1)
    for i = n1,1,-1 do
        turtle.down()
    end
    return print("DONE!")
end

for i = n1,1,-1 do
    turtle.digDown()
    turtle.dig()
    refuel(10)
    turtle.down()
    turtle.dig()
end
print("DONE")