API Installer

-- BrainStone's APIs autoupdater installer
-- Version 1.12
--
-- This script will install BrainStone's APIs autoupdater
--
-- Execute " pastebin run V2uDhBFU " to install or update if already installed
-- Execute " pastebin run V2uDhBFU update " to force update

function getLastLine(file)
  if not fs.exists(file) then
    return nil
  end

  local handle = fs.open(file, "r")

  local line, lastline

  repeat
    lastline = line
    line = handle.readLine()
  until line == nil

  return lastline
end

local targs = {...}
local mode = targs[1] or "install"
local useColor = term.isColor ~= nil and term.isColor()

if fs.exists("startup") then
  if mode ~= "update" and getLastLine("startup") == "-- 4024a1f38967b6f8d01e32a34688b43a" then
    mode = "update"
  end

  if mode == "install" then
    if fs.exists("startup.custom") then
      if useColor then
        term.setTextColor(colors.red)
      end

      print("Warning! \"startup\" and \"startup.custom\" already exsist!")
      print("If you install now \"startup.custom\" will be deleted!")

      if useColor then
        term.setTextColor(colors.white)
      end

      local text

      repeat
        write("Would you rather like to update instead? (y/n) ")

        text = read():sub(1, 1)
      until text == "y" or text == "n"

      if text == "n" then
        fs.delete("startup.custom")
        fs.move("startup", "startup.custom")
      else
        mode = "update"
      end
    else
      fs.move("startup", "startup.custom")
    end
  end

  fs.delete("startup")
end

if useColor then
  term.setTextColor(colors.lime)
end

if mode == "install" then
  write("Installing")
elseif mode == "update" then
  write("Updating")
end

if useColor then
  term.setTextColor(colors.white)
end

print(" BrainStone's APIs autoupdater")

shell.run("pastebin get mEYD0JM5 startup")
shell.run("startup")