Surface root module init errors on didOpen

[radeksimko]

I am marking this as draft for now, because I the format of errors it would produce is ... suboptimal due to the fact that error output from terraform providers schema -json is just not designed to be displayed anywhere else outside of the terminal (even after stripping ANSI colour codes).

[aeschright]

Oh yeah, that's a lot to read in a popup window. Are you thinking we could do some cleanup on the language server side of this?

[radeksimko]

Yes, I talked to @kmoe about this too and she mentioned she's tackling similar problem in https://github.com/hashicorp/terraform-exec by essentially regexp-ing known error messages and re-interpreting them as custom error types which have more "consumable" String().

I think that might be good enough solution in the short run, until Terraform exposes this in a more friendly (JSON) format.

[radeksimko]

Closing this in favour of #218

[ghost]

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