Improve error reporting localisation with HLS

[guibou]

The error reporting of this library is awesome, thank you!

However, it does not integrate well with HLS. Any error span the complete quasi quote AND the customerror message localization with custom caret is integrated in the error message, leading to a lot of clutter.

See for example:

In comand line we get:

[1 of 2] Compiling Main             ( Main.hs, Main.o, Main.dyn_o )

Main.hs:40:19: error:
    • 3:9:
  |
3 |     fom "user"
  |         ^
unexpected '"'
expecting end of input or white space

    • In the quasi-quotation:
        [maybeStatement|
    select name :: text, email :: text, phone :: text?
    fom "user"
    where id = $1 :: int4
    |]
   |
40 |   [maybeStatement|
   |       

However, it is possible to give precise localization position in quasi quote using a small trick. See my implementation in PyF here:

https://hackage.haskell.org/package/PyF-0.11.2.1/docs/src/PyF.Internal.QQ.html#reportErrorAt

[nikita-volkov]

Thanks for the suggestion. PR is welcome. Unfortunately I won't have the time to implement this myself.