farmScript

--Robot modules,functions,variables
---------------------------------------------------------------
local component = require("component")
local robot = require("robot")
local sides = require("sides")

local geolyzer = component.proxy(component.get("935"))

local x = 7 --deep
local y = 10 --wide
local facing = "forward"
local temp = "place holder"

function harvestRows(s)
  for i=1,s-1 do --deep loop
   -- robot.placeDown() --plants crop below robot
  --  robot.forward(1)

    local scan = geolyzer.analyze(sides.down) --scans metadata of block below to see if it's ready for harvest
      for k,v in pairs(scan) do
        if scan.metadata == 3 then
          robot.swingDown() --harvests plant
        end
      end
    robot.placeDown()
    robot.forward()
  end
end

function nextRow(s)
  if s == "forward" then
    robot.turnRight()
    harvestRows(2)
   -- robot.forward(1)
   -- harvestRows(1)
    robot.turnRight()
    temp = "back"
  end
  if s == "back" then
    robot.turnLeft()
    harvestRows(2)
    robot.turnLeft()
    temp = "forward"
  end
  facing = temp
end

function toStart(s)
  if s == "forward" then
    robot.turnLeft()
    for i=1,y do robot.forward(1) end
    robot.turnRight()
  end
  if s == "back" then
   for i=1,x-1 do robot.forward(1) end
    robot.turnRight()
   for i=1,y do robot.forward(1) end
    robot.turnRight()
  end
end
------------------------------------------------------------------------------------------
--Robot program
-----------------------------------------------------------------------------------------
for i=1,y do           --for the width of the farm
  harvestRows(x)        --harvest a row x deep
  nextRow(facing)      --move to the next row and turn around
end

toStart(facing)        --return robot to start