update

args = {...}
if not fs.exists("programs.lua") then
  shell.run("pastebin get JNFHN32v programs.lua")
  if args[1] == nil then
    error() -- to exit the program to prevent downloading programs twice
  end
end
os.loadAPI("programs.lua")

function update(prog)
  if fs.exists(prog .. ".lua") then
    fs.delete(prog .. ".lua")
  end
  shell.run("pastebin get " .. programs.mapping[prog] .. " " .. prog .. ".lua")
end

if args[1] == nil then
  update("programs")
elseif args[1] == "all" then
  update("programs")
  for key, value in pairs(programs.mapping) do
    if key ~= "programs" then
      update(key)
    end
  end
else
  update(args[1])
end