TL;DR often goes at the top of the post, not the bottom 😉

It’s an opportunity to learn more lisp!

I do currently have a shell script using ripgrep & notmuch-tag, but felt it could be an interesting problem to solve within Emacs :)

This is r/emacs !! Looking for an Emacs Lisp solution 😁

I plan on searching hundreds of files (all notes) so… some way that does not open all of them would be preferable.

I ask only for the first step. After I have all the referenced message IDs I will start working on the notmuch side to find and tag!