ac-check.rsc

# policy=read,write,policy,test

:local ac [:parse [/system script get _ac source]]
:local acPrev [:parse [/system script get _ac_prev source]]

:local acState [$ac]
:local acPrevState [$acPrev]

:if ($acState = 1 && $acPrevState = 0) do={
  /system script run ac-online
} else={
  :if ($acState = 0 && $acPrevState = 1) do={
    /system script run ac-offline
  }
}