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partial design

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Joey Hess 2009-05-19 13:36:12 -04:00
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doc/todo/matching_different_kinds_of_links.mdwn
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@ -7,3 +7,31 @@ And in general, it would be quite useful to be able to distinguish different kin
It could distinguish the links by the `rel=` attribute. ([[Tags already receive a special rel-class|todo/rel_attribute_for_links]].) This means there is a general need for a syntax to specify user-defined rel-classes on wikilink (then bug deps would simply use their special rel-class, either directly, or through a special directive like `\[[!depends ]]`), and to refer to them in pagespecs (in forward and backward direction).
Besides pagespecs, the `rel=` attribute could be used for styles. --Ivan Z.
> FWIW, the `add_link` function introduced in a recent
> release adds an abstraction that could be used to get
> part of the way there to storing data about different types of
> links. That function could easily be extended to take an optional
> third parameter specifying the link type.
>
> Then there's the question of how to store and access the data. `%links`
> does not offer a good way to add additional information about links.
> Now, we could toss `%links` entirely and switch to an accessor function,
> but let's think about not doing that..
>
> The data that seems to be needed is basically a deep hash, so
> one could check `$linktype{$page}{tag}{$link}` to see if
> the page contains a link of the given type. (Note that pages could
> contain links that were duplicates except for their types.)
>
> There would be some data duplication, unfortuantly, but if `%linktype`
> is not populated for regular wikilinks, it would at least be limited to
> tags and other unusual link types, so not too bad.
>
> `%linktype` could be stored in `%pagestate`.. if so
> the actual use might look like `$pagestate{$page}{linktype}{tag}{$link}`.
> That could be implemented by the tag plugin right now
> with no core changes. (BTW, then I originally wrote tag, pagestate
> was not available, which is why I didn't make it differentiate from
> normal links.) Might be better to go ahead and add the variable to
> core though. --[[Joey]]