Mine

on *:START: {
  server fluxirc.sephiroth.org.uk
}
on *:CONNECT: {
  if ($network == SwiftIRC) {
    var %channels 0
    while (%channels < $lines(autojoin.txt)) {
      inc %channels
      join $read(autojoin.txt,%channels)
    }
  }
}

on *:TEXT:?add *:#: {
  if ($nick == A_A) {
    write autojoin.txt $2
    notice A_A channel added
  }
}