farmwheat

--[[Wheat Farming program by Al Sweigart
Plants and harvests wheat.
Assumes a field is in front and
to the right of the turtle,
with a chest behind it.]]

os.loadAPI('hare')

-- handle command line arguments
local cliArgs = {...}
local length = tonumber(cliArgs[1])
local width = tonumber(cliArgs[2])

-- display "usage" info
if length == nil or width == nil or cliArgs[1] == '?' then
  print('Usage: farmwheat <length> <width>')
  return
end

print('Hold Ctrl-T to stop.')

-- check that chest is there
if not hare.findBlock('minecraft:chest') then
  error('Must start next to a chest.')
end

-- face field
turtle.turnLeft()
turtle.turnLeft()


-- checkWheatCrop() harvests mature wheat
-- and plants seeds
function checkWheatCrop()
  local result, block = turtle.inspectDown()

  if not result then
    turtle.digDown() -- till the soil
    plantWheatSeed()
  elseif block ~= nil and block['name'] == 'minecraft:wheat' and block['metadata'] == 7 then
    -- collect wheat and replant
    turtle.digDown()
    print('Collected wheat.')
    plantWheatSeed()
  end
end


-- plantWheatSeed() attempts to plant
-- a wheat seed below the turtle
function plantWheatSeed()
  if not hare.selectItem('minecraft:wheat_seeds') then
    print('Warning: Low on seeds.')
  else
    turtle.placeDown() -- plant a seed
    print('Planted seed.')
  end
end


-- storeWheat() puts all wheat into an
-- adjacent chest
function storeWheat()
  -- face the chest
  if not hare.findBlock('minecraft:chest') then
    error('Could not find chest.')
  end

  -- store wheat in chest
  while hare.selectItem('minecraft:wheat') do
    print('Dropping off ' .. turtle.getItemCount() .. ' wheat...')
    if not turtle.drop() then
      error('Wheat chest is full!')
    end
  end

  -- face field again
  turtle.turnLeft()
  turtle.turnLeft()
end


-- begin farming
while true do
    -- check fuel
  if turtle.getFuelLevel() < (length * width + length + width) then
    error('Turtle needs more fuel!')
  end

  -- farm wheat
  print('Sweeping field...')
  hare.sweepField(length, width, checkWheatCrop)
  storeWheat()

  print('Sleeping for 10 minutes...')
  os.sleep(600)
end