[pmwiki-users] Markup for linking to page with a "unique" identifier

[Frank Graffagnino]

> Date: Sat, 11 Aug 2007 23:27:16 +0200
> From: christian.ridderstrom at gmail.com
> Subject: [pmwiki-users] Markup for linking to page with a "unique"
>         identifier
> To: pmwiki-users at pmichaud.com
> Message-ID: <Pine.LNX.4.64.0708112320420.6276 at ssh-01.md.kth.se>
> Content-Type: text/plain; charset="iso-8859-1"
>
> A user (actually Jose', a LyX developer) asked me about renaming pages and
> automatically having links to the renamed page working. He suggested that
> pages should have some ID (or label) that you could refer to rather than
> linking to the name of the page.
>
> I replied that this is already possible by using (:pagelist ...:). It can
> be done as follows:
>
> * Insert a marker/label/tag on the destination page. It could e.g. be as
>    follows:
>         (:comment tag_some-id :)
>
> * To link to that page, use something like:
>         (:pagelist "tag_some-id" fmt=#... :)
>
> As long as the "tag" stays on the page, the pagelist markup will find it
> even if the page is renamed. In theory this seems nice, but are there some
> drawbacks here?
>
> * Perfomance?  What happens if something like is used extensively?
>
> * Uniqueness of id:s?   Maybe a mechanism is needed to help keep the id:s
>    unique?
>
> * Maybe a simpler/clearer markup would be useful?
>
> Thoughts?
>
> Best regards,
> Chrstian
>
> --
> Christian Ridderstr?m, +46-8-768 39 44               http://www.md.kth.se/~chr
>

I have a couple of suggestions.  One would be to use a unique pagetext
variable to store the unique id.  Then the pagelist would become:

 (:pagelist $:pagetagid="tag_some-id" fmt=#... :)

the ensures that a pagetext variable called "pageid" is defined as well.

For uniqueness, if you were going to automate it... perhaps the ctime
of the page would be sufficient?

FG