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--watch flag makes neuron crash due to non-exaustive matching by Reactor.hs #679
Description
Little to add to what the subject says. Site generation is fine but the file system watch feature makes neuron crash.
Steps to reproduce the behavior:
neuron -d . genworks fine:
Plugins enabled: dirtree, links, tags, neuronignore
Loading directory tree (2705 .md files) ...
Building graph (2706 notes) ...
Building route data ...
Rendering routes (2707 slugs) ...
🥅 Nothing updated in output directory
neuron -d . gen --watchproduces:
Plugins enabled: dirtree, links, tags, neuronignore
Loading directory tree (2705 .md files) ...
Building graph (2706 notes) ...
Building route data ...
Rendering routes (2707 slugs) ...
🥅 Nothing updated in output directory
neuron: src/Neuron/Reactor.hs:(219,35)-(227,44): Non-exhaustive patterns in \case
HasCallStack backtrace:
bracket, called at lib/System/IO/Utf8.hs:154:24 in with-utf8-1.1.0.0-ErmN3rUvJv42z4OzMNWvfT:System.IO.Utf8
Questioning the LLMs on this matter they suggest me to keep the folder with my .md zettel files clean of everything else than files with that extension.. but I have folders for particular topics and static content (ie. png files) in my zettelkasten. Maybe you find that bit of information useful.
Environment:
- Ubuntu Linux 26.04.01 LTS
- Neuron version 1.9.37.0
I acknowledge that this project is in maintenance mode.
Activity
srid commentedon Sep 28, 2026
Thanks for the report! This was caused by a newer fsnotify version adding file-event types that neuron didn't handle, so it crashed on the first file save. It had nothing to do with non-
.mdfiles or subfolders in your zettelkasten.A fix is in #680. Could you check whether it fixes it for you? You can try it with:
jcborras commentedon Sep 28, 2026
I hereby confirm that the said branch fixes the issue.
Fix --watch crash on new fsnotify events (#680)