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  1. -- get arguments
  2.  
  3. local tArgs = { ... }
  4. if #tArgs ~= 1 then
  5.     print( "Usage: basicTunne; <Tunnel Length>" )
  6.     return
  7. end
  8.  
  9. local tunnelLength = tonumber( tArgs[1] )
  10. if tunnelLength < 1 then
  11.     print( "Tunnel Length must be positive!" )
  12.     return
  13. end
  14.  
  15. -- function to tunnel 1x3 directly in front
  16.  
  17. local function digInFront ()
  18.  
  19.     if turtle.detectUp() then
  20.         if turtle.digUp() then
  21.             turtle.suckDown()
  22.         end
  23.     end
  24.    
  25.     if turtle.detect() then
  26.         if turtle.dig() then
  27.             turtle.suckDown()
  28.         end
  29.     end
  30.    
  31.     if turtle.detectDown() then
  32.         if turtle.digDown() then
  33.             turtle.suckDown()
  34.         end
  35.     end
  36. end
  37.  
  38. -- function to move x blocks in given direction (left / right) maintaining orientation
  39. local function move(numToMove, orientation)
  40.     local cleanNumToMove = tonumber( numToMove )
  41.  
  42.     if orientation == "left" then
  43.         if turtle.turnLeft() then
  44.             for i = 0, cleanNumToMove, 1 do
  45.                 turtle.forward()
  46.             end
  47.             turtle.turnRight()
  48.         end
  49.     end
  50.    
  51.     if orientation == "right" then
  52.         if turtle.turnRight() then
  53.             for i = 0, cleanNumToMove, 1 do
  54.                 turtle.forward()
  55.             end
  56.             turtle.turnLeft()
  57.         end
  58.     end
  59.        
  60. end
  61.    
  62. -- program start
  63.  
  64. local done = false
  65.  
  66. while not done do
  67.     for n = 0, tunnelLength/2 do
  68.    
  69.         digInFront()
  70.         move(1, "right")
  71.         digInFront()
  72.         move(1, "right")
  73.         digInFront()
  74.        
  75.         turtle.forward()
  76.        
  77.         digInFront()
  78.         move(1, "left")
  79.         digInFront()
  80.         move(1, "left")
  81.         digInFront()
  82.     end
  83.     done = true
  84. end
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