citations

Hi,

I am creating a site, and trying to implement a referencing/citation system.

I'd like to render something like
"Lorem ipsum dolor sit amet[[ref:foo2012]], consectetur adipisicing elit, sed do eiusmod tempor incididunt[[ref:bar2011]] ut labore et dolore magna aliqua."
stored in a TextField,
"Lorem ipsum dolor sit amet[1], consectetur adipisicing elit, sed do eiusmod tempor incididunt[2] ut labore et dolore magna aliqua."

"[1] foo, 'something something' (2012)
[2] bar, 'something something' (2011)
"
where "foo2012" is the slug of a reference object, that has a title, author, data etc.

I have made a filter that can scan though a string, pick out the [[]] tags and look up the reference. I can use this in  a template like {{ site.description|refs }}. However i need somewhere to store mapping of numbers to references for that page, so that i can filter multiple blocks on the same page without resetting the numbering. I would then use a tag at the end of the page, that rendered the collected list.

The docs on custom tags and filters talks about render_context, but does not show how to use them with filters (only with tags).

Am i going about this the wrong way? should filters be stateless? i realise that parsing relationships out of a text field is not good database style, but i can't think of another way to allow editors to put citations into text. i would also like to use a similar tag for cross links in the text (eg [[site:foo]] -> "/sites/view/foo").

thanks,
sam

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