Show Summary Of Changes Since N Revs Back

According to the docs for Formatted Search, $changes(n) will give me changes between the latest version and version n.

However, when I'm searching across many pages, I really can't guess what n should be. I'm more likely to want to see changes between the latest and two back, or three back, than some explicit n.

I would like to have the option of entering a negative number to specify changes between latest verson and n versions back. But that's not available (yet).

I tried using CALC:

%SEARCH{".*"  type="regex" nosearch="on" noheader="on" 
   newline="%BR%" order="modified" limit="20" reverse="on" 
   format="| [[$web.$topic][$topic]] | r $rev | $date -- $wikiname | $changes | $changes($percntCALC{$EVAL($rev - 1)}$percnt) | "}%

But

$changes($percntCALC{$EVAL($rev - 1)}$percnt)

isn't giving me what I want.

I assume there's an "order of evaluation" problem.

Can I do what I want to do? If so, how?

---

We turned this into a task, Tasks.Item9464. Essentially, it seems the $changes token is ... less than useful in its current form

-- PaulHarvey - 13 Feb 2012