Vanisher

// =====================================================================
//  Vanisher  ·  step 2 of 2
//  skimi3d script library · https://grid.skimi3d.com/scripts/vanisher
//
//  Goes inside whatever the Temporary Rezzer puts out. It waits for the
//  word to go, and then goes.
//
//  This half exists because of a rule with no way round it: nothing can
//  delete an object from outside. A rezzer can put something out, but it
//  cannot take it back. Only the object itself can leave, so the object
//  has to be carrying something that is willing to do it.
//
//  Plain LSL. Nine lines of it do the work.
// =====================================================================


// ---------------------------------------------------------------------
//  Settings
// ---------------------------------------------------------------------

// Both halves of the kit have to agree on this number and this word.
// Change them together or not at all. Change them at all only if you
// are running two rezzers near each other that should not answer to
// the same call.
integer CHANNEL = -70714;
string  GO_AWAY = "vanish";

// Minutes after which it leaves anyway, even if nobody calls it. 0.0
// waits for the word for ever.
//
// It is worth setting. A rezzer that is deleted, or a region that
// restarts at the wrong moment, leaves its object standing with nobody
// left to call it home.
float GIVE_UP_AFTER = 60.0;

// Only obey the person who owns me. On by default: without it, anybody
// running a copy of this kit could clear away your build by saying the
// word within earshot.
integer OWNER_ONLY = TRUE;


// ---------------------------------------------------------------------
//  Everything below here is the machinery
// ---------------------------------------------------------------------

default
{
    state_entry()
    {
        // Listening only to objects owned by the same person. The empty
        // name and empty key mean "anybody", and the owner test in the
        // event narrows it back down.
        llListen(CHANNEL, "", NULL_KEY, GO_AWAY);

        if (GIVE_UP_AFTER > 0.0) llSetTimerEvent(GIVE_UP_AFTER * 60.0);
    }

    listen(integer channel, string name, key who, string message)
    {
        if (OWNER_ONLY)
        {
            // `who` is the object that spoke. Whose object it is, is the
            // question that matters, and it is asked of the speaker
            // rather than trusted from the message.
            if (llGetOwnerKey(who) != llGetOwner()) return;
        }

        llDie();
    }

    timer()
    {
        llDie();
    }

    on_rez(integer start)
    {
        // The clock has to start again for each copy that is put out,
        // not once for the one sitting in the rezzer's Contents.
        llResetScript();
    }
}