startup

mon = peripheral.wrap("left")
local monx, mony = mon.getSize()

term.clear()
mon.clear()
mon.setCursorPos(5,1)

mon.setTextColor(colors.blue)
mon.write("To Do List")

mon.setTextColor(colors.orange)
mon.setCursorPos(1,2)
mon.write("Green Means Completed, Red Means Not")

mon.setCursorPos(1,4)


while true do

  monx, mony = mon.getSize()
  temp = mony
  mony = 4

  repeat
    numberx, numbery = mon.getCursorPos()
    mon.setCursorPos(monx - 6, mony)
    mon.setTextColor(colors.cyan)
    mon.write("Line " .. mony)
    numbery = numbery + 2
    mony = mony + 2
  until mony >= temp



  term.setTextColor(colors.blue)
  term.setCursorPos(11,1)
  term.write("Welcome to the To Do List")
  term.setTextColor(colors.red)

  term.setCursorPos(1,2)
  term.write("Note: All list items are limited to 7 characters")
  term.setCursorPos(1,3)
  term.write("before the end of the monitor.")
  term.setCursorPos(1,4)
  term.write("Add more monitors to increase length of items.")
  term.setCursorPos(1,5)
  term.write("Minimum Monitor Width is 4 Blocks Wide")

  term.setTextColor(colors.orange)
  term.setCursorPos(1,7)
  term.write("Follow the Below Prompts to Edit To Do List")
  term.setTextColor(colors.white)
  term.setCursorPos(1,8)

  mon.setTextColor(colors.red)
  mon.write("> ")
  mon.setTextColor(colors.white)

  term.write("Enter Line to Edit: ")

  line = read()
  line = tonumber(line)

  if line ~= nil then

  if (line % 2 ~= 0) or (line < 4) then
    term.write("Line Invalid")
    sleep(1)
  else

  term.write("Enter List Item or Type C for Completed,")
  term.setCursorPos(1,10)
  term.write("NC for Not Completed or DEL to Delete: ")
  term.setCursorPos(1,11)

  newline = read()
  mon.setCursorPos(1,line)

  if (newline == "C") or (newline == "c") then
    mon.setTextColor(colors.green)
    mon.write("> ")
  elseif (newline == "NC") or (newline == "nc") or (newline == "Nc") or (newline == "nC") then
    mon.setTextColor(colors.red)
    mon.write("> ")
  elseif (newline == "DEL") or (newline == "Del") or (newline == "DEl") or (newline == "DeL") or (newline == "dEl") or (newline == "dEL") or (newline == "deL") or (newline == "del") then
    mon.setTextColor(colors.red)
    mon.clearLine()
  else
    mon.clearLine()
    mon.setTextColor(colors.red)
    mon.write("> ")
    mon.setTextColor(colors.white)
    mon.write(newline)
  end
  end
  else
  term.setTextColor(colors.red)
    term.write("Invalid Line")
    sleep(1)
  end

  if line ~=nil then

  if (line % 2 == 0) and (line >= 4) then
    term.write("Todo List Updated")
    sleep(1)
    term.clear()
  else
    term.clear()
  end
  else
  term.clear()
  end
end