Item2168: feels to me like there should be a Foswiki::Func::isTagHandlerRegistered

ie

sub isTagHandlerRegistered {
    my ( $tag ) = @_;
    ASSERT($Foswiki::Plugins::SESSION) if DEBUG;

    return exists($Foswiki::functionTags{$tag});
}

though obviously abstracted - in that Func should really call a method in Foswiki.pm, etc, etc, blah.

or to stop me from going mad, we could just have a flag on registerTagHandler which only registers the tag if its not already defined..

(atm i'm thinking of a backport of things like GROUPINFO, but i do wonder about plugins over-registering each other in what is a random order.

-- SvenDowideit - 27 Sep 2009

Rather than a flag to over-register, I'd rather require a "me, me, pick me" flag if you intend to replace. Thus by default it would be an error to re-register a tag. Only if you specify the "me only" flag would your registration over-write another, and once you have registered a "me only" tag, nobody else can register it even if they also give the "me only" flag.

-- CrawfordCurrie - 07 Oct 2009

Changed to Enhancement

-- KennethLavrsen - 09 Jan 2010