Updater 1.1

----Variables----
names = {"t", "Menu"}
adresses = {"5yu5bhR3", "fwGLRkYK"}
amount = 2
nameFile = nil
adressFile = nil

function showList()
  if amount == 0 then
    print("No programs installed")
    return
  end
  print("-------------------------")
  print("program list")
  print("-------------------------")
   for _,v in pairs(names) do
     print(v.." - "..adresses[_])
  end
end

function add(name, adress)
  print("Adding "..name.." to list at index "..amount+1)
  names[amount+1] = name
  adresses[amount+1] = adress
  amount = amount+1
  updateList()
end

function clearList()
  names = nil
  adresses = nil
  amount = 0
  fs.delete("names")
  fs.delete("adresses")
  fs.delete("amount")
end
function check(list, entry)
  for _,v in pairs(list) do
    if v == entry then
     -- print("found "..entry.."/"..v.." at ".._)
     -- sleep(3)
      return _
    end
  end
  return -1
end

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

function load(name)
  if not fs.exists(name) then
    print("Error! cant find file!")
    return
  end
  local file = fs.open(name,"r")
  local data = file.readAll()
  file.close()
  return textutils.unserialize(data)
end

function updateList()
  save(names,"names")
  save(adresses, "adresses")
  save(amount, "amount")
end

-----------Formating-----------------

function draw_text_term(x, y, text, text_color, bg_color)
  term.setTextColor(text_color)
  term.setBackgroundColor(bg_color)
  term.setCursorPos(x,y)
  write(text)
end

function draw_line_term(x, y, length, color)
    term.setBackgroundColor(color)
    term.setCursorPos(x,y)
    term.write(string.rep(" ", length))
end

function progress_bar_term(x, y, length, minVal, maxVal, bar_color, bg_color)
  local barSize = math.floor((minVal/maxVal) * length)

  draw_line_term(x, y, length, bg_color) --background bar
  draw_line_term(x, y, barSize, bar_color)  --progress so far
end

function menu_bars()
 -- draw_line_term(1, 1, 55, colors.white)
 -- draw_text_term(14, 1, "ComputerCraft Test Program", colors.black, colors.white)

 -- draw_line_term(1, 19, 55, colors.white)
 -- draw_text_term(20, 19, "", colors.black, colors.black)
end

--------------Installer---------------------

function install(program, pastebin)
  term.clear()
  menu_bars()

  draw_text_term(1, 4, "Installing: "..program.."", colors.white, colors.black)
  term.setCursorPos(1,6)
  term.setTextColor(colors.white)
  sleep(0.5)

  --delete any old backups
  if fs.exists(program.."_old") then
    fs.delete(program.."_old")
    end

  --remove old configs
  if fs.exists("config.txt") then
    fs.delete("config.txt")
    end

  --backup current program
  if fs.exists(program) then
    fs.copy(program, program.."_old")
    fs.delete(program)
    end

  --remove program and fetch new copy
  shell.run("pastebin get "..pastebin.." "..program)

  sleep(0.5)

end

----------Main-------------

args = {...}
print(args[1])
print(args[2])
print(args[3])

--initializing tables
if (fs.exists("names") and fs.exists("adresses") and fs.exists("amount")) then
  names = load("names")
  adresses = load("adresses")
  amount = load("amount")
end

--sleep(1)

if amount > 0 then
  nCheck = check(names, args[1])
  --print("nCheck = "..nCheck)
else
  nCheck = -1
end

if args[1] == "showList" then
  showList()
  return
end

if args[1] == "init" then
  for _,v in pairs(names) do
    install(v, adresses[_])
  end
  updateList()
  error()
end

if args[1] == "clear" then
  clearList()
  error()
end

if args[1] == "showItem" then
  print(names[arg[2]].." - "..adresses[arg[2]])
  error()
end

if args[1] == "addAmount" then
  amount = amount + args[2]
  error()
end

if args[1] == "amount" then
  print("Amounts of programs: "..amount)
  error()
end

if (nCheck > -1 and args[2] == nil) then
  install(args[1], adresses[nCheck])
  error()
end

if (nCheck > -1 and args[2] ~= adresses[nCheck]) then
  adresses[nCheck] = args[2]
  install(args[1], args[2])
  updateList()
  error()
end

if (nCheck == -1 and args[2] == nil) then
  term.setTextColor(colors.red)
  print("Name is not in the list. Adding a new program requires pastebin adress")
  term.setTextColor(colors.white)
  error()
end

if (nCheck == -1 and args[2]) then
  add(args[1], args[2])
  install(args[1], args[2])
  error()
end