Add Stack project-level configuration

[mpilgrem]

Thank you for your very interesting blog post.

Footnote 4 referred to an interest in a working Stack build. I can build the package with this configuration file (which uses the most recent Stackage LTS Haskell snapshot, for GHC 9.4.7).

I also had success with using the plugin with Stack, with a simple single-package project, with package.yaml:

name:                hlintPluginTest
version:             0.1.0.0

dependencies:
- base >= 4.7 && < 5
- hlint-plugin

ghc-options:
- -fplugin HLint.Plugin

library:
  source-dirs: src

executables:
  hlintPluginTest:
    main:                Main.hs
    source-dirs:         app
    ghc-options:
    - -threaded
    - -rtsopts
    - -with-rtsopts=-N
    dependencies:
    - hlintPluginTest

and stack.yaml:

resolver: lts-21.13

extra-deps:
- hlint-plugin-1.0.2

flags:
  ghc-lib-parser-ex:
    no-ghc-lib: true
  hlint:
    ghc-lib: false

[mpilgrem]

However. my example does not work if I bump the snapshot to GHC 9.6.3 (nightly-2023-10-01). That appears to be another manifestation of this: https://discourse.haskell.org/t/ghcs-fplugin-any-changes-between-9-4-7-and-9-6-2/7656. That experience seems to be either a bug in GHC 9.6.2/9.6.3, or a bug in Stack or Cabal (the library) only revealed by GHC 9.6.2/9.6.3. I am planning to raise an issue at GHC's repository. EDIT: https://gitlab.haskell.org/ghc/ghc/-/issues/24043

[Gabriella439]

Thank you! This is still great even if the GHC 9.6 build doesn't work

[mpilgrem]

The GHC 9.6.3 issue is a bug in Cabal-3.10.1.0: haskell/cabal#9375.