1. --[[Wheat Farming program by Al Sweigart
 2. Plants and harvests wheat.
 3. Assumes a field is in front and
 4. to the right of the turtle,
 5. with a chest behind it.]]
 6.
 7. os.loadAPI('hare')
 8.
 9. -- handle command line arguments
10. local cliArgs = {...}
11. local length = tonumber(cliArgs[1])
12. local width = tonumber(cliArgs[2])
13.
14. -- display "usage" info
15. if length == nil or width == nil or cliArgs[1] == '?' then
16.   print('Usage: farmwheat <length> <width>')
17.   return
18. end
19.
20. print('Hold Ctrl-T to stop.')
21.
22. -- check that chest is there
23. if not hare.findBlock('minecraft:chest') then
24.   error('Must start next to a chest.')
25. end
26.
27. -- face field
28. turtle.turnLeft()
29. turtle.turnLeft()
30.
31.
32. -- checkWheatCrop() harvests mature wheat
33. -- and plants seeds
34. function checkWheatCrop()
35.   local result, block = turtle.inspectDown()
36.
37.   if not result then
38.     turtle.digDown()  -- till the soil
39.     plantWheatSeed()
40.   elseif block ~= nil and block['name'] == 'minecraft:wheat' and
          block['metadata'] == 7 then
41.     -- collect wheat and replant
42.     turtle.digDown()
43.     print('Collected wheat.')
44.     plantWheatSeed()
45.   end
46. end
47.
48.
49. -- plantWheatSeed() attempts to plant
50. -- a wheat seed below the turtle
51. function plantWheatSeed()
52.   if not hare.selectItem('minecraft:wheat_seeds') then
53.     print('Warning: Low on seeds.')
54.   else
55.     turtle.placeDown()  -- plant a seed
56.     print('Planted seed.')
57.   end
58. end
59.
60.
61. -- storeWheat() puts all wheat into an
62. -- adjacent chest
63. function storeWheat()
64.   -- face the chest
65.   if not hare.findBlock('minecraft:chest') then
66.     error('Could not find chest.')
67.   end
68.
69.   -- store wheat in chest
70.   while hare.selectItem('minecraft:wheat') do
71.     print('Dropping off ' .. turtle.getItemCount() .. ' wheat...')
72.     if not turtle.drop() then
73.       error('Wheat chest is full!')
74.     end
75.   end
76.
77.   -- face field again
78.   turtle.turnLeft()
79.   turtle.turnLeft()
80. end
81.
82.
83. -- begin farming
84. while true do
85.     -- check fuel
86.   if turtle.getFuelLevel() < (length * width + length + width) then
87.     error('Turtle needs more fuel!')
88.   end
89.
90.   -- farm wheat
91.   print('Sweeping field...')
92.   hare.sweepField(length, width, checkWheatCrop)
93.   storeWheat()
94.
95.   print('Sleeping for 10 minutes...')
96.   os.sleep(600)
97. end