Add roots for haskell in default languages.toml

[0rphee]

Describe your feature request

So, while trying to load a Haskell stack project with helix, I found that the lsp couldn't find imports from external libraries, nevertheless, borrowing a line from the haskell-language-server configuration for kakoune has fixed the problem. I think it would be nice to add this to the default languages.tom for a better out-of-box experience.

Current configuration for haskell

[[language]]
name = "haskell"
scope = "source.haskell"
injection-regex = "haskell"
file-types = ["hs"]
roots = []
comment-token = "--"
language-server = { command = "haskell-language-server-wrapper", args = ["--lsp"] }
indent = { tab-width = 2, unit = "  " }

Improved configuration for haskell

[[language]]
name = "haskell"
scope = "source.haskell"
injection-regex = "haskell"
file-types = ["hs"]
roots = ["Setup.hs", "stack.yaml", "*.cabal"]                                        # <---- added roots
comment-token = "--"
language-server = { command = "haskell-language-server-wrapper", args = ["--lsp"] }
indent = { tab-width = 2, unit = "  " }

[the-mikedavis]

I agree 👍. Would you like to submit a PR?

[0rphee]

Done! #2954