Uploaded a cut-down version of my diary.org file here:

https://github.com/skx/org-worklog

That shows the tag-cloud and the necessary magic to update it on-save.

Thanks, that's a great example of how Org documents can integrate code that provides interactivity. I shared it on Reddit: https://www.reddit.com/r/emacs/comments/jj2ok0/skxorgworklog...

I cannot get it to work with M-x new-day, is there something other I need to do than have the document open? Thanks for sharing btw.

You need to evaluate the lisp at the bottom of the file, so that `M-x new-day`, `M-x today` and the other stuff gets loaded.

I've got a bit of code in my init-files that does that automatically, that's linked to in the readme. But as a quick alternative you can scroll down to the end, to the line that starts:

    "(defun new-day"

Select that line, and all the way down to the line that reads "(require 'ob-org)", and then run "M-x eval-region". That will evaluate the region and make the two new commands available.

Otherwise copy and paste the lisp from here into your emacs init file, and reload everything:

https://github.com/skx/dotfiles/blob/master/.emacs.d/init.md...

That will cause anything named `skx-startblock` to be evaluated automatically from an org-file on-load, and will also run the contents of `skx-saveblock` before saving any org-file, if present.

I saw now that I have to evaluate two lines of code, how do I set up my dot-files so that this happens? I am kinda lost.

Have you tried to combine that with caldav?

I have a table which contains all the distinct tags which have been used within the document, along with a count of how often they've been used. Clicking on the tag-name shows all the places it is used - via org-tags-view.

I guess I call it a tag-cloud, even if it isn't formatted like one would imagine on a web-page.

No package, just a bit of lisp-magic. I'd be happy to share an example if it were useful.