Repetition stopper

on *:input:#:{
  if (%lastmsg == $1-) { echo -at Repeat error! Type something different to $+(",%lastmsg,",.) | halt }
  if (/ == $left($1,1)) {
    $($1-,1)
    halt
  }
  else {
    msg $active $1-
    set %lastmsg $1-
    halt
  }
}