I've also updated Marcelo's code (above) to current ikiwiki, and moved it to a "marceloblogcomment" namespace - it's in the "marcelocomments" branch of my repository (see <http://git.debian.org/?p=users/smcv/ikiwiki.git;a=log;h=refs/heads/marcelocomments>). I had to reconstitute the .tmpl file, which Marcelo didn't post here.
--[[smcv]]
+
+OK, the postcomment branch in my repository contains an implementation. What
+do you think so far? Known issues include:
+
+* The combination of RSS/Atom links and the "post new comment..." button is
+ ugly - I need a way to integrate the "new comment" button into the feed links
+ somehow, like the way inline embeds its own "new blog post..." feature
+ (I don't think the current way really scales, though)
+
+* There are some tweakables (whether to commit comments into the VCS, whether
+ wikilinks are allowed, whether directives are allowed) that are theoretically
+ configurable, but are currently hard-coded
+
+* The wikilink/directive disarming doesn't work unless you have
+ prefixdirectives set (which I just realised)
+
+* \[[!smcvpostcomment]] now displays the comments too, by invoking \[[!inline]]
+ with suitable parameters - but it does so in a very ugly way
+
+* Start-tags in a comment with no corresponding end-tag break page formatting
+ (unless htmltidy is enabled - inline and aggregate have the same problem)
+
+* There is no access control, so anonymous users can always comment, and so
+ can all logged-in users. Perhaps we need to extend canedit() to support
+ different types of edit? Or perhaps I should ignore canedit() and make the
+ access control configurable via a parameter to \[[!smcvpostcomment]]?
+ I'd like to be able to let anonymous (or at least non-admin) users comment
+ on existing pages, but not edit or create pages (but perhaps I'm being too
+ un-wikiish).
+
+--[[smcv]]