turtle digger with screen

rednet.open("left")
f = fs.open("disk/coords.lua","r")
--excavate--
times = tonumber(read())

  mx = 0
  mz = 0
  my = 0

x = 0
y = 44        --where the refill pad is located--
z = 0

tx = 0
ty = 30        --where you want the turtle to dig--
tz = tonumber(f.readLine())
f.close()

height = 30    --how high up you want the turtle to go to avoid digging through buildings on its way to the mine --
ex = 5
ez = 5        --quarry size--
ey = 25

FuelCoefficent = 15 --oak plank--



function digUp()
  while turtle.detectUp() do
    turtle.digUp()
  end
end
function digDown()
  while turtle.detectDown() do
    turtle.digDown()
  end
end


Orientation = 1   --North = 1, East = 2, South = 3 and West = 4
tempor = 0
round = 1

FuelCoefficent = 15 --oak plank--

function refuel(amount)
  Rotate(2)
  while math.ceil((amount-turtle.getFuelLevel())/FuelCoefficent) >= 64 do
    turtle.suck(64)
    turtle.refuel(64)
  end
  if math.ceil((amount-turtle.getFuelLevel())/FuelCoefficent) > 0 then
    turtle.suck(math.ceil((amount-turtle.getFuelLevel())/FuelCoefficent))
    turtle.refuel(math.ceil((amount-turtle.getFuelLevel())/FuelCoefficent))
  end
  Rotate(1)
end


function GetOri()
  return Orientation
end

function SetOri(rot)
  Orientation = rot
end


function Rotate(rotation)
 if (Orientation  == rotation-2) or (Orientation  == rotation+2) then
   turtle.turnRight()
   turtle.turnRight()
   Orientation = rotation
 elseif(Orientation == 1  and rotation == 4 ) or (Orientation == rotation + 1) then
   turtle.turnLeft()
   Orientation = rotation
 elseif (Orientation == 4  and rotation == 1 ) or (Orientation == rotation - 1) then
   turtle.turnRight()
   Orientation = rotation
  end
end

function GoX(C,T)

  if C > T then
    Rotate(4)
    for i = T+1, C do
while turtle.detect() do
      turtle.dig()
end
turtle.forward()
rednet.broadcast("x"..(T+1))
    end
  elseif T > C then
    Rotate(2)
    for i = C+1, T do
    while turtle.detect() do
      turtle.dig()
end
    turtle.forward()
    rednet.broadcast("x"..(C+1))
    end
  end
end

function GoY(C,T)

  if C > T then
    for i = T+1, C do
      turtle.digDown()
      turtle.down()
    end
  elseif C < T then
      for i = C+1, T do
        digUp()
        turtle.up()
      end
  end
end



function GoZ(C,T)
  if C > T then
    Rotate(1)
    for i = T+1, C do
      while turtle.detect() do
      turtle.dig()
end
      turtle.forward()
      rednet.broadcast("z"..(T+1))
    end
  elseif T > C then
    Rotate(3)
    for i = C+1, T do
      while turtle.detect() do
      turtle.dig()
end
    turtle.forward()
    rednet.broadcast("z"..(C+1))
    end
  end
end
function checkinv()
tempor = GetOri()
  if turtle.getItemCount(16) ~=0 then
    GoX(tx+mx,tx)
    GoZ(tz+mz,tz)
    GoY(ty+my,height)
    GoX(tx,x)
    GoZ(tz,z)
    GoY(height,y)
    Rotate(3)
    for i = 1,16 do
      turtle.select(i)
      turtle.drop(64)
    end
    turtle.select(1)
    Rotate(2)
    print("full inventory, need to drop off and refuel")
    refuel(2*(math.abs(mx)+math.abs(mz)+math.abs(my)+math.abs(tx-x)+math.abs(tz-z)+math.abs(height - y)+math.abs(ty-height)) + turtle.getFuelLevel() + ex+ez+ey)
    Rotate(1)
    GoY(y,height)
    GoX(x,tx)
    GoZ(z,tz)
    GoY(height,ty+my)
    GoX(tx,tx+mx)
    GoZ(tz,tz+mz)
    Rotate(tempor)
  end
end

function dig()
  checkinv()
  while turtle.detect() do
    turtle.dig()
  end
  if GetOri() == 1 then
    mz = mz-1
  elseif GetOri() == 2 then
    mx = mx+1
  elseif GetOri() == 3 then
    mz = mz+1
  elseif GetOri() == 4 then
    mx = mx-1
  end
  turtle.forward()
end



function excavate(x,y,z)
  Rotate(1)
  for p = 1, y do
    for i = 1, z do
        for o = 2, x do
          dig()
        end
        if GetOri() == 1 and i ~= z and round == 1 then
          Rotate(2)
          dig()
          Rotate(3)
        elseif GetOri() == 3 and i ~= z and round == 1 then
          Rotate(2)
          dig()
          Rotate(1)
        elseif GetOri() == 1 and i ~= z and round == 2 then
          Rotate(4)
          dig()
          Rotate(3)
        elseif GetOri() == 3 and i ~= z and round == 2 then
          Rotate(4)
          dig()
          Rotate(1)
        end
      end
      if round == 1 then
        round = 2
        Rotate(3)
      else
        round = 1
        Rotate(1)
      end
      checkinv()
    turtle.digDown()
    if p ~= ey then
    if turtle.down() == true then
      my = my - 1
    end
  end
  end
end
for i = 1, times do
round = 1
mx = 0
mz = 0
my = 0
print("new job, refueling....")
refuel(2*(math.abs(height - y)+math.abs(ty-height)+math.abs(tx-x)+math.abs(tz-z))+(ex*ez*ey)+ex+ez+ey)
GoY(y,height)
GoX(x,tx)
GoZ(z,tz)
GoY(height,ty+my)
GoX(tx,tx+mx)
GoZ(tz,tz+mz)
excavate(ex,ey,ez)
GoX(tx+mx,tx)
GoZ(tz+mz,tz)
GoY(ty+my,height)
GoX(tx,x)
GoZ(tz,z)
GoY(height,y)
Rotate(3)
f = fs.open("disk/coords.lua","w")
f.writeLine(tz-ez)
f.close()
tz = tz - ez
for i = 1,16 do
  turtle.select(i)
  turtle.drop(64)
end
turtle.select(1)
Rotate(1)
print("done")
end