ghcid on WSL doesn't get file change notification on drvfs

[TerrorJack]

When launching ghcid in WSL for a project located on /mnt/c/ somewhere, file change notification doesn't work at all. This is confirmed even with ghcid-0.6.8 and Windows insider build 15063.

WSL claims to have inotify support (see here) for drvfs. I'm not sure whether this should be a WSL issue, fsnotify issue or ghcid issue, so I'm opening an issue here for now, feel free to close it if not relevant.

Is it possible to add a polling mode instead of notification? stack supports rebuilding on change, and has notification/polling mode. This shall be a viable workaround for this issue.

[ndmitchell]

Probably an issue for fsnotify. Ghcid does have a polling mode but it’s not exposed - a command line flag would be easy to add.

[ndmitchell]

I added a flag --poll which switches back to polling.

[TerrorJack]

This now works out of the box on Windows 10 17751, so if anyone else is looking at this issue and want to set up a ghcid-based workflow with WSL, try switching to latest insider build (or wait for next Windows 10 release). Still thanks for adding --poll!