Tagging Posts with the Ox-Publish :makeindex Function

I have been wanting to have a way to tag different blog posts with different topics. This is a personal blog so the topics can ramble from fun one offs, to technical thoughts, to code snippets I want to remember. I did not see an easy way to do this until I stumbled across the :makeindex option for orgmode.

Essentiall you use the #+Index: some-topic-here keyword and then when you publish your org-project, assuming you set the :makeindex to non-nil you will get an theindex.org file that inputs theindex.inc. If you do that you will see a decent index, but the way the links are created you will see the same keyword multiple times with no individuation. I found that the function to make the index lives in ox-publish.el and I fiddled with the formatting in the org-publish-index-generate-theindex function. The following snippet contains more for context, but all I changed was the format line to make the keyword appear in bold and the link to the blog post file follow.

(dotimes (n len)
                (insert
                 (concat
                  (make-string (* (+ rank n) 2) ?\s) "  - "
                  (if (not (= (1- len) n)) (nth (+ rank n) entry)
                    ;; Last term: Link it to TARGET, if possible.
                    (let ((target (nth 2 idx)))
                      (format
                       "*%s* [[%s]]"
                       (car (last entry))
                       ;; Destination.
                       (pcase (car target)
                         (`nil (format "file:%s" file))
                         (`id (format "id:%s" (cdr target)))
                         (`custom-id (format "file:%s::#%s" file (cdr target)))
                         (_ (format "file:%s::*%s" file (cdr target))))
                       ;; Description.
                       )))
                  "\n"))))

I hope this helps someone else (and me when I next update org and it goes away). Soon I will ask on the mailing list how an option like this might be best incorporated.