Ineentho's Cutter v2

trees = 12
reqFuel = trees * 150 + 100

local main

function clearInventory()
        slot = 1
        while slot < 16 do
                slot = slot + 1
                turtle.select(slot)
                turtle.drop()
        end
end

function plantSaplings()
        turtle.select(1)
        turtle.forward()
        turtle.place()
        turtle.turnRight()
        turtle.forward()
        turtle.turnLeft()
        turtle.place()
        turtle.turnLeft()
        turtle.forward()
        turtle.turnLeft()
        turtle.turnLeft()
        turtle.place()
        turtle.turnRight()
        turtle.forward()
        turtle.turnRight()
        turtle.turnRight()
        turtle.place()
end

function dropAndLoot()
        print("Drop and loot")
        --Saplings should be in the first slot
        --and logs in the rest (but always in the last)

        --Drop all logs and take back one stack
        turtle.turnLeft()
        clearInventory()
        turtle.select(16)
        turtle.suck()

        --rotate to the other chest
        turtle.turnLeft()
        turtle.turnLeft()

        --Loot one stack saplings..
        turtle.select(1)
        turtle.suck()

        --and drop the rest..
        turtle.select(2)
        turtle.drop()

        --Rotate to its orginal position
        turtle.turnLeft()
end

function checkFuel()
    print("Checking fuel..")
        while turtle.getFuelLevel() < reqFuel do
                turtle.select(16)
                if turtle.refuel(1) then
                        if turtle.getFuelLevel() < reqFuel then
                                print("Fuel level (waiting for " .. reqFuel .. "): " .. turtle.getFuelLevel())
                        end
                else
                        --Fuel level too low and no logs left.
                        dropAndLoot()
                end
        end
end

function cutTree()

        --Get inside of the tree
        turtle.dig()
        turtle.forward()

        treeHeight = 0

        --Climb the tree up
        while turtle.dig() do
                turtle.digUp()
                turtle.up()
                treeHeight = treeHeight + 1
        end

        --At the top, get to the second half of the tree
        turtle.turnRight()
        turtle.dig()
        turtle.forward()
        turtle.turnLeft()
        turtle.digDown()
        turtle.down()
        turtle.dig()
        --Get down again

        level = treeHeight - 1

        while level > 0 do
                level = level - 1
                turtle.digDown()
                turtle.down()
                turtle.dig()
        end

        --Get back to the starting position
        turtle.turnLeft()
        turtle.forward()
        turtle.turnLeft()
        turtle.forward()
        turtle.turnLeft()
        turtle.turnLeft()

        print("Tree cut.")
        print("Replanting saplings")
        plantSaplings()
        print("Planted saplings.")

end

function goForward(steps)
        for step = 1, steps, 1 do
                turtle.forward()
        end
end

function waitForNext()
    --for i = 3, 1, -1 do
     --           print("Waiting " .. i .. " minutes..")
      --          sleep(60)
       -- end
end

function nextTree()
        tree = tree + 1
        if tree > trees then
                print("Returning to base..")
                turtle.turnRight()
                goForward(4 * (trees - 1) + 3)
                turtle.turnLeft()
                turtle.forward()
                turtle.turnRight()
                turtle.forward()
                turtle.turnLeft()
                turtle.turnLeft()
                turtle.down()
                waitForNext()
        else
                --Go to next tree
                turtle.turnLeft()
                goForward(4)
                turtle.turnRight()
                checkTree()
        end
end

function checkTree()
        turtle.select(1)
        if turtle.compare() then
                --It's still a sapling, go to next tree.
                print("Still saplings")
                nextTree()
        else
                print("Tree is fully grown. Cutting.")
                cutTree()
                nextTree()
        end
end

function goToFirstTree()
        --Move from the starting position to the cutting position of the first tree.
        turtle.up()
        turtle.forward()
        turtle.forward()
        turtle.turnLeft()
        turtle.forward()
        turtle.turnRight()
        turtle.forward()
        turtle.forward()
        turtle.turnRight()

        tree = 1

        checkTree()
end

function main()
        dropAndLoot()
        checkFuel()
        goToFirstTree()
end

while true do
        --Main is run once for each "round"
        main()
        print("Done")
end