[dokuwiki] Re: Purple Numbers

Christopher Smith wrote:


On 10 May 2009, at 15:30, Anika Henke wrote:
Purple Numbers are (in this case) granular hierarchical IDs applied to each <p>, <li>, <pre> and <table>. As all <hx> already have their
I would have thought the variable nature of wiki pages would make a paragraph number linking system problematic. Someone edits a page and the link accuracy could well be destroyed - unless the link is also to a particular revision.
Yes, indeed. Purple Numbers make more sense for static texts that have a "published" state (like books or articles). Therefore it's probably not reasonable to use them in a typical wiki environment, but more in CMS-like environment or a blog. 

There are two different concepts for Purple Numbers: HIDs and NIDs.
* NIDs (= Node IDs) are *permanent* IDs that will never change. That could even be used with text that constantly changes. (I suppose that could be easier to implement in a database-driven wiki engine.) * But the concept used for DokuWiki are HIDs (= Hierarchical IDs). The accuracy of the resulting links with these will at least not be destroyed too often, as adding or removing a paragraph in a lower level of a a well-structured document would only lead to the re-declaration of a few IDs and not all of them. (An example: If you removed the sentence 'Vertical tableheaders are possible, too.' from http://www.dokuwiki.org/syntax#tables, only 8 IDs would be affected - and not all 137 instances.)
I haven't thought of linking to a particular revision. For old revisions this already works automatically. But for a link to an anchor of the current revision, DokuWiki lacks the concept of a permalink to the current revision ...
* Unfortunately I couldn't figure out how the <pre>s from GeSHi can be manipulated.
The GeSHi <pre> is stripped and replaced by a DokuWiki wrapper element, usually <pre> in p_xhtml_cached_geshi (inc/parserutils.php). You could extend that function to take an "id" as well as a wrapper tag and if present add the id to the wrapper element. 

Thanks for the pointer. I will take a look at it.

Anika
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