non-blocking wait

 cast_spell("cast this on that",1) 

# NOTE1 - to make this thing work you will need triggers to set the state of your variables.
#         i used my previously written routines, which captured the state from prompt and are not included here.
#         the easiest way would be to set equilibrium to 0 after the spell is cast in 'cast_now'
#         and set it to 1 when the according trigger fires. this is far from foolproof, but the fastest way to get
#         you started.
#
# NOTE2 - if you have no idea what happens here with the variables and their types, refer to perldoc.
#         i used alot of references and complex data structures just to compress the code and make the whole thing
#         faster and easier
#
# NOTE3 - the whole solution is based on as much flexibility as i could think of at this point. you can use it for healing,
#         herbs, attacks, whatever you want. all you have to do is rewrite 'cast_spell' so it checks the propper requirements,
#         the variables to check and a new @waiting_queue
#
# NOTE4 - a few things can be removed here. the creation of new triggers is back from my idea/attempt to delete them after
#         fireing, which is unnecessary and even time consuming. a better way is to deactivate them as it actually happens,
#         or even keep them up and use them for loss/regain control too. there are many possibilities
#
# NOTE5 - as you see, the readiness triggers are set up as temporary and with moderate sequence number. to make the checks
#         work properly your -real- regain triggers will need lower seq and 'keep evaluating'
#
#

#####
my @waiting_queue = ();  # this line has to be either in global script scope or in some routine that is run at the start of the world
#####

sub cast_now {  # this one just sends the supplied string to the world. you can rename it and use it as the main output sub
  $world->Send(shift);
}  # see NOTE 1


sub cast_spell {   # this is what all your spell aliases should call
  my ($spell,$supersede) = @_;   # we get the full spell string as it will be sent to the world and optional 'supersede' flag
  my $failed = &check_readiness('eq','bal');  # first we check if variables for all required states give us a 'go' - NOTE2 & 3
  if ($failed) {   # nope, some of them was not ready, we have to queue
    @waiting_queue = () if ($supersede == 1);   # we empty the queue if this is a high priority spell
    push @waiting_queue, {$spell => ['eq','bal']};   # we queue the spell with its requirements - NOTE3
    &set_readiness_triggers(@$failed);   # and set the according triggers for those states that failed the test
  } else {   # ah! looks like we can cast!
    @waiting_queue = ();   # empty the queue 'just in case'. it should be emty, but you never know
    &cast_now($spell);   # and we cast the spell
  }
}


sub check_readiness {   # this sub checks the variables and returns those that are not '1'
  my $failed = undef;
  foreach my $name (@_) {
    push @$failed, $name if ($world->GetVariable("$name")) ne '1';  # if the variable is not '1', we add it to the 'failed' array
  }  # see also NOTE 1, 2 & 3
  return $failed;  # return the failed 
}


sub set_readiness_triggers {   # this is used to set the triggers that will be watching for changes - NOTE4
  foreach my $name (@_) {
    if ($world->GetTriggerInfo("waitfor_$name", 1) eq '') { # sets a trigger if its not set already - NOTE5
      $world->AddTriggerEx("waitfor_$name", ($world->GetTriggerInfo($name."_regain", 1)), "%1", 16384+32+8+1, -1, 0, "", "readiness_trigger", 12, 50)
    } else {  # there is a trigger already, lets activate it
      $world->EnableTrigger("waitfor_$name", 1);
    }
  }
}  


sub readiness_trigger {    # this one will be used by our created triggers
  my $name = shift;
  if ($#waiting_queue >= 0) {  # if there is at least 1 item in queue we can go ahead
    my ($spell,$requirements) = each %{$waiting_queue[0]};  # get the first spell and its requirements from the queue - NOTE 2
    my $failed = &check_readiness(@$requirements);  # check if we meet the requirements
    if ($failed) {   # nope, we dont
      &set_readiness_triggers(@$failed)    #set new triggers for what we are missing
    } else {   # yup, we do
      shift @waiting_queue;   # remove the first spell from the queue
      &cast_now($spell);   # and cast it
    }
  } else {   # the queue is empty
    $world->EnableTrigger($name, 0);   # disable the trigger that fired
  }
}