haskell-language-server: empty list removes all formatters

# See https://haskell-language-server.readthedocs.io/en/latest/troubleshooting.html#static-binaries for more information.

, dynamic ? true

# which formatters are supported. An empty list means “all”.

, supportedFormatters ? [ ]

# Which formatters are supported. Pass `[]` to remove all formatters.

#

# Maintainers: if a new formatter is added, add it here and down in knownFormatters

, supportedFormatters ? [ "ormolu" "fourmolu" "floskell" "stylish-haskell" ]

}:

# make sure the user only sets GHC versions that actually exist

        '';

      }))

      ((if dynamic then enableCabalFlag else disableCabalFlag) "dynamic")

      (if supportedFormatters != [] then removeUnnecessaryFormatters else lib.id)

      removeUnnecessaryFormatters

    ]

    ++ lib.optionals (!dynamic) [

      justStaticExecutables