Here's a replacement routine for Hugo 2.1 that allows for random NPC movement
via character scripting. To use it, you will simply make the call to CharMove
with the object parameter set to 0, e.g.:

setscript[Script (Bozo, 3)] = &CharMove, 0, &CharMove, 0, &LoopScript, 0

Well, ok, it's actually not quite that simple. You also have to provide an
"npc_move" property for all your locations, listing the direction objects
corresponding to valid moves for your NPC:

room lobby "Lobby"
{
  npc_move e_obj, w_obj, n_obj, s_obj
}

That's it. Just make sure you declare the new npc_move property at the
beginning or your source before you try to use it.

Note:
This supercedes my previous effort, which didn't require the extra property
but suffered from some other serious defects because of it. All in all, the
benefit is worth the added work, I think. Of course, none of this is
required if you don't plan on moving your NPC's around randomly.

!---------------------------------------------------------------------------
! CharMove
! Script usage:  &CharMove, <direction object>

property npc_move       ! put this before first room object, not here

array pdir[11]

replace CharMove(char, dir)
{
        local newroom, a
        
#ifclear NO_OBJLIB

	general = 1                     ! for signalling a character move
					! to, for example, door.door_to
	
        if dir = 0                      ! if random move
        {
          while a < parent(char).#npc_move
          { if parent(char).npc_move#(a+1)
              pdir[a]=parent(char).npc_move#(a+1)
            a=a+1
          }
          a=a-1
          if pdir[0] = 0
            return true                 ! if no available move, just skip
          dir = pdir[random(a)]
          while a >= 0
          { pdir[a] = 0 : a=a-1 }       ! flush array
        }

        newroom = parent(char).(dir.dir_to)

        if char in location and general = 1             ! door.door_to sets
							! general = 2 if it
							! prints a message
	{
		print "\n"; CThe(char);
		print " head"; MatchSubject(char); " ";
		if dir = u_obj or dir = d_obj
			print dir.name; "ward."
		else
		{
			print "off to the ";
			print dir.name; "."
		}
		event_flag = true
	}
	elseif char in location
		event_flag = true
	
	move char to newroom
	
#ifset DEBUG        
	if _sc_flag
	{
		print "["; CThe(char); IsorAre(char, true); " now in:  ";
		print capital parent(char).name; ".]"
	}
#endif

	if char in location and general = 1
	{
		print "\n"; CThe(char);
		print " arrive"; MatchSubject(char); " from ";
		if dir ~= u_obj and dir ~= d_obj
			print "the "; (dir.dir_from).name; "."
		elseif dir = u_obj
			print "below."
		else
			print "above."
		event_flag = true
	}
	elseif char in location
		event_flag = true

	general = 0                     ! always reset it

#endif  ! ifclear NO_OBJLIB

	run parent(char).after
	
	return true
}

!---------------------------------------------------------------------------
Enjoy!

This document is provided as-is, with no warranty whatsoever express or
implied, by Cardinal Teulbachs, Archbishop of Frith.