function load(name)
  local file = fs.open(name,"r")
  local data = file.readAll()
  file.close()
  return textutils.unserialize(data)
end

function save(table,name)
  local file = fs.open(name,"w")
  file.write(textutils.serialize(table))
  file.close()
end

function printTable(table)
  if #table ~= 0 then
    for i=1,#table do
      print("Todo List:")
      write(i)
      write(" ")
      print(table[i])
    end
  end
end

function EditList()
    print("Current List:")
    printTable(table)
    print("Enter the task to edit")
    edit = io.read()
    clrc()
    write("Editing ")
    print(edit)
    print(table[edit])
    table[edit] = io.read()
end

function clrc()
  term.clear()
  term.setCursorPos(1,1)
end

function Addtolist()
    while input ~= "q" or "Q"do
     clrc()
     print("Adding to list (Enter q to Quit):\n")
     write(count)
     write(" ")
     input = io.read()
     if input ~= "q" or "Q" then
       table[count] = input
     end
     count = count + 1
    end
end

clrc()

local table = {}
local input = ""
local edit

if fs.exists("list") then
     table = load("list")
     print("Existing List found.")
end

local count = #table + 1
local choice = 0

while choice ~= 4 do
  clrc()
  print("Todo List Program:")
  print("1. Print Todo List")
  print("2. Add to the List")
  print("3. Edit part of List")
  print("4. Quit")
  input = io.read()
  if input == 1 then
    printTable()
  end
 if input == 2 then
    Addtolist()
  end
  if input == 3 then
    EditList()
  end
  if input == 4 then
    choice = 4
  end
end

clrc()
save(table,"list")
print("Todo List:")
printTable(table)
print("Program is not running:")
print("Type todolist to run the program")