Rubbbber

--IPJ Industries Inc. - Pragmatic Programming by IPJ
direction="left"
home=true

function sweep()
  for i = 1, 7 do
  turtle.dig()
  turtle.up()
  end
  turtle.dig()

for i = 1, 8 do
  turtle.down()
  end
end

function rotate()
  turtle.turnRight()
  turtle.forward()
  turtle.turnLeft()
  turtle.forward()
  turtle.turnLeft()
end

function harvest()
    for i = 1, 4 do
        sweep()
        rotate()
    end
end

function dumpItems()
    for i = 1, 16 do
        turtle.select(i)
        turtle.drop()
    end
end

function toggleDirection()
    if direction=="left" then
        print("Direction set to right")
        direction="right"
    else
        print("Direction set to left")
        direction="left"
    end
end

function turn()
    if direction=="left" then
        print("turn left")
        turtle.turnLeft()
    else
        print("turn right")
        turtle.turnRight()
    end
end

function turnBack()
    if direction == "left" then
        print("turnBack right")
        turtle.turnRight()
    else
        print("turnBack left")
        turtle.turnLeft()
    end
end

function goHome()
    turn()
    turn()
    while turtle.forward() do
    end
    if direction=="left" then
        turtle.turnLeft()
        while turtle.forward() do
        end
        turtle.turnRight()
    end
    turtle.turnRight()
    turtle.forward()
    turtle.turnLeft()
    turtle.forward()
    turtle.turnLeft()
    dumpItems()
    turtle.turnLeft()
    print("Sleeping for 15min to recharge")
    sleep(900)
end

function goEdge()
    print("Going to edge of wall")
    while turtle.forward() do
    end
end

function goDown()
    print("Going down")
    while turtle.down() do
    end
end

function resume()
    goDown()
    if turtle.detect() then
        turtle.turnRight()
    end
    goEdge()
    turtle.turnRight()
    goEdge()
    while not checkStartCorner() do
        goNextCorner()
    end
    turtle.turnRight()
    turtle.forward()
    turtle.turnLeft()
    turtle.forward()
    turtle.turnLeft()
    dumpItems()
    turtle.turnLeft()
    print("Sleeping for 15min to recharge")
    sleep(900)
end

function checkStartCorner()
    print("Checking for start corner")
    turtle.up()
    if turtle.detect() then
        turtle.down()
        return true
    end
    turtle.down()
    return false
end

function goNextCorner()
    print("Going to next corner")
    turtle.turnRight()
    goEdge()
end

function nextTree()
    print("Finding next tree")
    if home then
        print("Home now")
        turtle.forward()
        home=false
        return true
    else
        turn()
        turtle.forward()
        if not turtle.forward() then
            print("Reached end of row, finding new row")
            turnBack()
            turtle.forward()
            turtle.forward()
            if turtle.detect()then
                print("Reached last row, going home")
                goHome()
                direction="left"
                home=true
                return false
            end
            turtle.down()
            turnBack()
            turtle.forward()
            turn()
            toggleDirection()
        else
            turnBack()
        end
        return true
    end
end

if not turtle.detectUp() then
    resume()
end
while true do
    print("Starting Tapping Route...")
    while nextTree() do
        harvest()
    end
end