{ pkgs, ... }:

{

projectRootFile = "flake.nix";

# Haskell (fourmolu) is deliberately NOT wired into `nix fmt`. fourmolu's

# --haddock-style is global (single-line | multi-line | multi-line-compact)

# with no per-comment or by-length mode, so any choice rewrites the

# hand-authored Haddock — single-line line-prefixes long block comments

# (annoying to copy), while multi-line bloats short ones. The source keeps a

# deliberate mix (short `-- |`, long `{- | … -}`), so Haskell stays a manual

# `fourmolu -i lib/ exe/ test/` step the author runs when they choose.

programs.cabal-fmt.enable = true;

programs.nixfmt.enable = true;

programs.yamlfmt.enable = true;

programs.dhall.enable = true; # test/ps/{packages,spago}.dhall

# Generated goldens are committed; never reformat them. (test/ps/.spago is

# gitignored, so treefmt's git-aware walk already skips it.)

settings.global.excludes = [

"test/ps/output/**"

"dist-newstyle/**"

"result"

# yamlfmt strips the trailing template comments from .hlint.yaml; keep it

# hand-maintained.

".hlint.yaml"

];

}