farmer.lua

sides = require("sides")
component = require("component")
robot = require("robot")
geo = component.geolyzer
harvesting = true
row = 1
column = 1
robot.up()
while harvesting == true do
  robot.forward()
  if geo.analyze(sides.down)["name"] == "minecraft:wheat" then
    robot.swingDown()
    robot.placeDown()
  elseif geo.analyze(sides.down)["name"] == "minecraft:air" then
    if robot.placeDown() == false then
      robot.down()
      if geo.analyze(sides.down)["name"] == "minecraft:water" then
        robot.up()
      elseif geo.analyze(sides.down)["name"] == "minecraft:stone" then
        robot.up()
        if row % 2 == 1 then
          robot.turnRight()
          robot.forward()
          robot.turnRight()
        else
          robot.turnLeft()
          robot.forward()
          robot.turnLeft()
        end
        row = row + 1
      elseif geo.analyze(sides.down)["name"] == "minecraft:dirt" or geo.analyze(sides.down)["name"] == "minecraft:grass" then
        robot.up()
        robot.useDown()
        robot.placeDown()
      elseif geo.analyze(sides.down)["name"] == "minecraft:wool" then
        harvesting = false
        if row % 2 == 1 then
          robot.turnAround()
          robot.up()
          while column > 0 do
            robot.forward()
            column = column - 1
          end
        end
        robot.turnRight()
        while row > 1 do
          robot.forward()
          row = row -1
        end
        robot.turnRight()
        robot.down()
      end
    end
  end
  if row % 2 == 1 then
    column = column + 1
  else
    column = column - 1
  end
end