Implementing tags in terms of links is clever, but it would be nice if it was
opaque in both directions: tagging and matching tags. Writing pagespecs to
find out which pages are tagged with a given name means that the pagespec is
tied to whatever the tagbase is.

This patch adds a pagespec function 'tag' which lets you write pagespecs to
match tagged pages independent of whatever the tagbase is set to.

 -- [[users/Jon]] 2009/02/17

> So, this looks good, appreciate the patch.
> 
> The only problem I see is it could be confusing if `tag(foo)` matched
> a page that just linked to the tag via a wikilink, w/o actually tagging it.
>
> One other thing, perhaps it should be called `tagged()`? --[[Joey]] 

[[!tag patch]]

    --- a/plugins/IkiWiki/Plugin/tag.pm	2009-02-16 11:30:11.000000000 +0000
    +++ b/plugins/IkiWiki/Plugin/tag.pm	2009-02-17 15:40:03.000000000 +0000
    @@ -125,4 +125,12 @@
     	}
     }
     
    +package IkiWiki::PageSpec;
    +
    +sub match_tag ($$;@) {
    +	my $page = shift;
    +	my $glob = shift;
    +    return match_link($page, IkiWiki::Plugin::tag::tagpage($glob));
    +}
    +
     1