generatetreelist; similar function for retrieving depth

Hello,

Does anybody know of a function like generatetreelist that seperates
the depth from the value. Instead of counting the spacer chars.

I saw an SQL query in the explanation page of MySQL.
It's this page: http://dev.mysql.com/tech-resources/articles/hierarchical-data.html

This is the query:
SELECT node.name, (COUNT(parent.name) - 1) AS depth
FROM nested_category AS node,
nested_category AS parent
WHERE node.lft BETWEEN parent.lft AND parent.rgt
GROUP BY node.name
ORDER BY node.lft;

I don't know how I would use this query with find.
Though I could use the custom-query-function.

The thing is; I would like to seperate depth and the value of my tree
(categories). Then I can filter it with htmlentities (the category
names), without using htmlentities on the spacer.

So if anybody can point me in the right direction I would be very
pleased.

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