CC Modem Utility

local mArgs = {...}
local help = "modem <open/close/status/help>"

function autoOpen()
 for _, v in pairs(rs.getSides()) do
  if peripheral.isPresent(v) and peripheral.getType(v) == "modem" then
   if not rednet.isOpen(v) then
    rednet.open(v)
    print("Modem opened on "..v.." side")
   else
    printError("Modem on "..v.." side already open")
   end
  end
 end
end

function autoClose()
 for _, v in pairs(rs.getSides()) do
  if peripheral.isPresent(v) and peripheral.getType(v) == "modem" then
   if rednet.isOpen(v) then
    rednet.close(v)
    print("Modem closed on "..v.." side")
   else
    printError("Modem on "..v.." side already closed")
   end
  end
 end
end

function list()
 for _, v in pairs(rs.getSides()) do
  if peripheral.isPresent(v) and peripheral.getType(v) == "modem" then
   print("Modem detected on "..v.." side")
   if rednet.isOpen(v) then
    print("Modem is open")
   elseif not rednet.isOpen(v) then
    print("Modem is closed")
   end
  end
 end
end

if #mArgs < 1 then
 print(help)
else
 if mArgs[1] == "open" then
  autoOpen()
 elseif mArgs[1] == "close" then
  autoClose()
 elseif mArgs[1] == "status" then
  list()
 elseif mArgs[1] == "help" then
  print(help)
 end
end