Obsidian

local pArgs = { ... }
local i = 0
local size = 0
function error1()
 print("Usage: obsidian <path> <swing>")
 print("path, 0 - endless movement")
 print("swing, left = l or right = r")
end
if #pArgs < 2 then
 error1()
 return
end
local statis = {0,0,0,0}
local coor = {["x"] = 0, ["y"] = 0, ["c"] = 5} --X, Y, Course
local size = tonumber( pArgs[1] )
if pArgs[2] == "l" then
 i = 1
else
 if pArgs[2] == "r" then
  i = 2
 else
  error1()
  return
 end
end
function coordina(xi)
 if coor.c == 5 or coor.c == 9 or coor.c == 1 then
  coor.c = 5
 end
 if xi then
  if coor.c == 6 or coor.c == 4 then
   coor.y = coor.y + 1

  end
  if coor.c == 8 or coor.c == 2 then
   coor.y = coor.y - 1
  end
  if coor.c == 5 or coor.c == 9 or coor.c == 1 then
   coor.x = coor.x + 1
   coor.c = 5
  end
  if coor.c == 7 or coor.c == 3 then
   coor.x = coor.x - 1
  end
 end
end
function turnLeft()
 if turtle.turnLeft() then
  coor.c = coor.c - 1
 end
 coordina()
end
function turnRight()
 if turtle.turnRight() then
  coor.c = coor.c + 1
 end
 coordina()
end
function swing()
 if i == 1 then
  turnLeft()
  fo()
  turnLeft()
  i = i + 1
  statis[3] = statis[3] + 1
 else
  if i == 2 then
   turnRight()
   fo()
   turnRight()
   i = i - 1
   statis[4] = statis[4] + 1
  else
  end
 end
end
function ref()
 while true do
  if turtle.getFuelLevel() > 0 then
   return true
  else
   shell.run('clear')
   monitor()
   print("Add Fuel")
   sleep(1)
   shell.run('refuel')
  end
 end
end
function fo()
 ref()
 if turtle.forward() then
  statis[2] = statis[2] + 1
  coordina(true)
  return true
 else
  return false
 end
end
function last()
if statis[3] + statis[4] > coor.y then
  print( "End of the room: ", (statis[3] + statis[4])," > ", coor.y)
  return true
 end
end
function monitor()
 shell.run('clear')
 print()
 print("Fuel level is ", turtle.getFuelLevel())
 print("Blocks excavated ", statis[1])
 print("Distance travel ", statis[2])
 print("How many turns")
 print("left: ", statis[3], " right: ", statis[4])
 print("X: ", coor.x, " Y: ", coor.y, " Course: ", coor.c)
 print()
end
while true do
 if size ~= 0 then
  if size > statis[2] then
   else break
  end
 end
 if last() then
  break
 end
 if turtle.digDown() then
  statis[1] = statis[1] + 1
 end
 if not fo() then
  swing()
 end
 monitor()
end