Miscellany

brb {
  if (%brbaway == true) echo You are already away!
  else {
    set %brbaway true | set %brbreason $1- | set %brbtime $ctime | set %brbnick $nick | amsg I'm now away. (Because: %brbreason $+ ) Left at: $time $+ . 
    nick %brbnick $+ Yournick  }
}
/back {
  if (%brbaway != true) echo You weren't away!
  else {
    amsg  I'm now back. (Reason: %brbreason $+ ) I was gone for $duration($calc($ctime - %brbtime)) $+ .
    nick %brbnick Yournick | unset %brb*
  }
}