Subject: bug#60656: 30.0.50; tree-sitter: editing a buffer invalidates visited node instances

From: Mickey Petersen <[email-masked]>
Date: Sun, 08 Jan 2023 11:08:16 +0000

If you parse some text, retrieve a node -- using `treesit-node-at', for example -- and then edit the buffer, then the node you retrieved is marked outdated.

However, tree-sitter is capable of handling that, to a greater or lesser extent:

https://tree-sitter.github.io/tree-sitter/using-parsers#editing

It is therefore possible to refresh node instances that were created _before_ the edit. I suppose it could remain an explicit step that you must enter a special form and then Emacs will track node instances issued inside that form and refresh them when edits take place inside of it.

As it stands, it is very hard to edit and maintain a node registry at the same time. (I'm using markers and overlays as a crude hack to work around it.)

In GNU Emacs 30.0.50 (build 6, x86_64-pc-linux-gnu, GTK+ Version
 3.24.20, cairo version 1.16.0) of 2023-01-02 built on mickey-work
Repository revision: c209802f7b3721a1b95113290934a23fee88f678
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12013000
System Description: Ubuntu 20.04.3 LTS