Stan should normalize incoming file paths to be relative

[keithfancher]

Related to the HLS issue haskell/haskell-language-server#3174 and its associated PR haskell/haskell-language-server#4023.

Stan's checksMap and createCabalExtensionsMap use relative paths, but Stan will happily take absolute paths for queried HIE files. Paths coming in from HLS, for example, were absolute, causing Map misses and resulting in the above issue. The result of these misses is that Stan didn't detect any enabled language extensions, and, e.g., would spam the user with suggestions to enable StrictData.

I would suggest normalizing incoming files, ensuring they're relative as expected, to avoid issues like this in the future. And/or documenting that Stan expects relative paths.

Thank you!

[tomjaguarpaw]

Thanks for the report. stan and extensions have very little active maintainership currently. I'm happy to oversee and advise a patch to fix this, but I won't have time to do it myself any time in the near future. Perhaps @0rphee is interested?

[tomjaguarpaw]

The first thing to do would be to produce an example that demonstrates the current behaviour, as simply as possible.

[0rphee]

Probably I won't be able to work on this for the foreseeable future, maybe in a few months.. :)