Force Tree farm -beta-

function checkredstone()
   while true do
   if redstone.getInput("left") then
      print("Sleeping...")
      sleep(10)
   else
   break
end
end
end

function forward()
   if not turtle.forward() then
      turtle.dig()
      turtle.attack()
   end
end

function forwardtest()
   while true do
      if not forward() then
         turtle.back()
         break
      end
   end
end

function forwardturn()
   while true do
      if not turtle.forward() then
         turtle.turnLeft()
         break
      end
   end
end

function drop()
   for d=1,14 do
      turtle.select(d)
      turtle.dropDown()
   end
end

function cut()
   turtle.dig()
   turtle.forward()
   while true do
      if turtle.digUp() then
      turtle.up()
      else if not turtle.down() then
      break
      end
   end
end
end

function tree()
   plant()
   bonemeal()
   cut()
   forward()
   forward()
end

function movetodrop25trees()
   turtle.turnRight()
   for g=1,16 do
      if not turtle.back() then
         turtle.turnLeft()
         turtle.turnLeft()
         turtle.attack()
         turtle.dig()
         turtle.turnRight()
         turtle.turnRight()
      end
   end
end

function check4trees()
  if turtle.getFuelLevel()<175 then
     refuel()
   end
end

function check25trees()
  if turtle.getFuelLevel()<600 then
     refuel()
   end
end

function refuel()
   turtle.select(16)
   turtle.turnRight()
   turtle.turnRight()
   while true do
   if not turtle.suck() then
      print("No fuel. Sleeping.")
   else
   turtle.refuel(64)
   turtle.select(1)
   turtle.turnLeft()
   turtle.turnLeft()
   break
end
end
end

function plant()
   turtle.select(14)
   while true do
   if not turtle.place() then
      turtle.dig()
      turtle.attack()
    else
   turtle.select(1)
   break
   end
   end
end

function getsaplings()
   turtle.select(14)
   turtle.turnRight()
   while true do
   if not turtle.suck() then
      print("No saplings. Sleeping.")
   else
   turtle.select(1)
   turtle.turnLeft()
   break
   end
   end
end

function getbonemeal()
   turtle.select(15)
   turtle.up()
   turtle.turnRight()
   while true do
   if not turtle.suck() then
      print("No bonemeal. Sleeping.")
   else
   turtle.select(1)
   turtle.turnLeft()
   turtle.down()
   break
   end
   end
end

function bonemeal()
   turtle.select(15)
   while true do
      if not turtle.place() then
      turtle.select(1)
      break
      end
   end
end

function firstrow()
   for y=1,4 do
   tree()
   end
   cut()
   forward()
   turtle.turnRight()
   forward()
   forward()
   forward()
   turtle.turnRight()
end

function secondrow()
   for y=1,4 do
   tree()
   end
   cut()
   forward()
   turtle.turnLeft()
   forward()
   forward()
   forward()
   turtle.turnLeft()
end

function thirdrow()
   for y=1,4 do
   tree()
   end
   cut()
   forward()
   turtle.turnRight()
   forward()
   forward()
   forward()
   turtle.turnRight()
end

function fourthrow()
   for y=1,4 do
   tree()
   end
   cut()
   forward()
   turtle.turnLeft()
   forward()
   forward()
   forward()
   turtle.turnLeft()
end

function fifthrow()
   for y=1,4 do
   tree()
   end
   cut()
   turtle.turnLeft()
   for t=1,12 do
      forward()
   end
   movetodrop25trees()
end

while true do
   checkredstone()
   check25trees()
   getsaplings()
   getbonemeal()
   for o=1,3 do
      forward()
   end
   firstrow()
   secondrow()
   thirdrow()
   fourthrow()
   fifthrow()
   drop()
   turtle.select(15)
   turtle.up()
   turtle.turnRight()
   turtle.drop()
   turtle.turnLeft()
   turtle.down()
   sleep(90)
end