CC Turtle: Feller v0.3.1

local args = { ... }
local posX = 0
local posZ = 0
local posY = 0
local replant = false
local replant_delay = 60
local maxloops = 1

if #args < 1 then
    print("Usage: progname <diam. (1|2)> [loop count] [delay (s)]")
    return false
end

local diam = tonumber( args[1] )

if #args >= 2 then
    maxloops = tonumber( args[2] )
    replant = true
end

if #args >= 3 then
    replant_delay = tonumber( args[3] )
end

if maxloops > 1 then
    if turtle.getItemCount(15) == 0 or turtle.getItemCount(16) == 0 then
        print("Error: need saplings and bonemeal in slots 15 (s) and 16 (bm)")
        return false
    end
end


function digOneUp()
    turtle.digUp()
    if turtle.up() == false then
        print("Error: Could not move up")
        return false
    end
    posY = posY + 1

    if diam > 1 then
        turtle.dig()
    end

    return true
end


function digOneDown()
    turtle.digDown()
    if turtle.down() == false then
        print("Error: Could not move down")
        return false
    end
    posY = posY - 1

    if diam > 1 then
        turtle.dig()
    end

    return true
end


function dumpInventory()
    if turtle.detect() then
        -- Now we should be where we started
        for i=1,14 do
            local items = 0
            items = turtle.getItemCount(i)
            turtle.select(i)

            -- Chest is full
            if turtle.drop() == false and items > 0 then
                return false
            end
        end
    end

    return true
end

function feller()
    turtle.select(1)

    if turtle.detect() == false then
        print("Error: No block in front!")
        return false
    end

    -- Dig the first block ...
    if turtle.dig() == false then
        print("Error: Could not dig the first block!")
        return false
    end

    -- ... and move to position "inside" the tree area
    if turtle.forward() == true then
        posX = posX + 1
    else
        print("Error: Could not move to position!")
        return false
    end

    if diam >= 2 then
        turtle.dig()
    end

    -- Dig the first colum (1 or 2 blocks long)
    while turtle.detectUp() == true do
        if digOneUp() == false then
            print("Error while digging and moving up")
            return false
        end
    end

    -- If we are digging a 2x2 tree, move the the other column:
    if diam == 2 then
        turtle.turnRight()
        turtle.dig() -- Dig just to be sure there are no leaves blocking our way
        turtle.forward()
        posZ = posZ + 1
        turtle.turnLeft()
        turtle.dig()

        -- Dig down until we are at the same level that we started
        while posY > 0 do
            if digOneDown() == false then
                print("Error while digging and moving down")
                return false
            end
        end

        -- Move back to the same position that we started in
        -- First, move in the "Z"-direction
        turtle.turnRight()
        while posZ > 0 do
            turtle.back()
            posZ = posZ - 1
        end

        turtle.turnRight()
    elseif diam == 1 then
        while posY > 0 do
            if turtle.down() == false then
                print("Error while moving down")
                return false
            end
            posY = posY - 1
        end
        turtle.turnRight()
        turtle.turnRight()
    end

    -- Move back in the "X"-direction
    if turtle.forward() == false then
        print("Error while trying to move to the starting spot")
        return false
    end
    posX = posX - 1

    dumpInventory()

    -- And finally, reorient
    turtle.turnRight()
    turtle.turnRight()
end

function replantTree(bonemeal)
    if bonemeal == nil then
        bonemeal = false
    end

    if diam == 1 then
        turtle.select(15)
        turtle.place()

        -- Use bonemeal to grow the tree?
        if bonemeal == true then
            turtle.select(16)
            turtle.place()
        end
    elseif diam == 2 then
        turtle.select(15)
        turtle.forward()
        turtle.forward()
        turtle.turnRight()
        turtle.place()
        turtle.turnLeft()
        turtle.back()
        turtle.place()
        turtle.turnRight()
        turtle.place()
        turtle.turnLeft()
        turtle.back()
        turtle.place()

        -- Use bonemeal to grow the tree?
        if bonemeal == true then
            turtle.select(16)
            turtle.place()
        end
    end
end


function suckSaplings()
    local down = false
    turtle.select(15)
    turtle.suckDown()

    -- If there is no block below, go down and suck the saplings
    -- that the water currents have brought us.
    if turtle.detectDown() == false then
        down = true
        turtle.down()
    end

    turtle.turnRight()
    turtle.suck()
    turtle.turnLeft()
    turtle.turnLeft()
    turtle.suck()

    if down == true then
        turtle.turnLeft()
        turtle.suck()
        turtle.turnRight()
        turtle.up()
    end

    turtle.turnRight()
end


for i = 1,maxloops do
    feller()
    if replant == true then
        os.sleep(replant_delay)

        -- Suck the sapling that are on the ground
        suckSaplings()

        -- Dump the inventory again
--      turtle.turnRight()
--      turtle.turnRight()
--      dumpInventory()
--      turtle.turnRight()
--      turtle.turnRight()

        -- Replant the tree
        if i < maxloops then
            replantTree(true)
        else
            replantTree(false)
        end
    end
end