3x5 Turtle Miner ComputerCraft 1.8 Gravel Proof

--Version 1.8
dArgs = {...}
distance = 0
close = false
home = false
--Improved movements for less gravel issues
function turtleForward()
  if not turtle.forward() then
    repeat
      turtle.dig()
      sleep(.5)
    until turtle.forward()
  end
end
function turtleUp()
  if not turtle.up() then
    repeat
      turtle.digUp()
    until turtle.up()
  end
end
function turtleDown()
  if not turtle.down() then
    turtle.digDown()
  end
end
function turtleDig()
  if turtle.detect() then
    repeat
      turtle.dig()
      sleep(.5)
    until not turtle.detect()
  end
end
--Technical Functions
function closeProgram()
  close = true
  return
end
function distanceForward()
  turtleForward()
  distance = distance + 1
end
function goHome()
  turtle.turnLeft()--/Turning back
  turtle.turnLeft()
  for i=1,distance do
    turtleForward()
  end
  depositInv()
  turtle.turnRight()--/Facing origin
  turtle.turnRight()
  home = true
end
function depositInv()
  for i=1,16 do
    turtle.select(i)
    turtle.drop()
  end
  turtle.select(1)
end
function checkFuel()
  if turtle.getFuelLevel() - 15 <= distance then
    if not home then
      goHome()
    end
    if distance == tonumber(dArgs[1]) then
      term.setTextColor(colors.green)
      print("Done!")
    end
    if turtle.getFuelLevel() == 0 then
      term.setTextColor(colors.red)
      print("Out of fuel. Program Canceled.")
      closeProgram()
    else
      term.setTextColor(colors.red)
      print("Fuel too low. Program Canceled.")
      print("Current fuel level: "..turtle.getFuelLevel())
      closeProgram()
    end
  end
end
function checkInv()
  if turtle.getItemCount(16) >= 1 then
    print("Inventory full! Dumping items where I started.")
    goHome()
    checkFuel()
    if distance == tonumber(dArgs[1]) then --Fixes error where if inventory detected full at dArgs it will travel to and back
      term.setTextColor(colors.green)
      print("Done!")
      closeProgram()
    end
    if not close then
      for i=1,distance do
        turtleForward()
      end
      home = false
    end
  end
end
function returnHome()
  if home then
    return
  end
  goHome()
  sleep(.6)
  term.setTextColor(colors.green)
  print("Done!")
end
--Input and Returns
if turtle.getFuelLevel() <= 15 then
  print("Need at least 16 fuel.")
  print("Current fuel level: "..turtle.getFuelLevel())
  return
end
if tonumber(dArgs[1]) == nil then
  print("miner <distance>")
  return
elseif tonumber(dArgs[1]) == 0 then
  print("Distance must be greater than 0")
  return
elseif tonumber(dArgs[1]) == 1 then
  print("Mining "..dArgs[1].." block out")
else
  print("Mining "..dArgs[1].." blocks out")
end
--Mining Function
repeat
    distanceForward()
    turtle.turnLeft()
    turtleForward()
    turtleUp()
    turtleUp()
    turtleDig()
    turtleDown()
    turtleDig()
    turtleDown()
    turtleDig()
    turtle.turnRight()
    turtle.turnRight()
    turtleForward()
    turtleForward()
    turtleUp()
    turtleUp()
    turtleDig()
    turtle.turnLeft()
    turtle.turnLeft()
    turtleDig()
    turtleDown()
    turtleDig()
    turtle.turnRight()
    turtle.turnRight()
    turtleDig()
    turtleDown()
    turtleDig()
    turtle.turnLeft()
    turtle.turnLeft()
    turtleForward()
    turtle.turnRight()
    checkFuel()
    checkInv()
    if close then
      break
    end
until distance == tonumber(dArgs[1])
returnHome()
--Code by MrDubbyWubby