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Make settings.lang_packages append instead of replace

Browse source 
Downstream modules assign settings.lang_packages.<lang> plainly, which
out-priorities mkOptionDefault and silently dropped the built-in
defaults (e.g. lintr, breaking R linting in downstream wrappers like the
project-template ed flake).

Move the built-in defaults into a separate settings.langPackageDefaults
option and compose defaults ++ lang_packages at the consumption sites
(catPkgs r/python/julia, quarto extraRPackages, neovide R host). A new
append-semantics check fails if defaults migrate back into lang_packages.

Also fix pre-existing inverted assertions in downstream-overrides check:
the override module sets cats.r = true, so assert presence, not absence.
This commit is contained in:
Daniel Winkler 2026-08-25 11:25:05 +10:00
commit 9a6e20110e
6 changed files with 206 additions and 113 deletions
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8
README.md
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@ -198,7 +198,8 @@ projectSettings = {
### Language packages (module defaults)
Add Python/R/Julia libraries that get appended to the module defaults. The built-in defaults are:
Add Python/R/Julia libraries. These are appended to the built-in defaults, which
always apply (see `settings.langPackageDefaults` in `modules/module/settings/lang-packages.nix`):
- Python: `duckdb`, `polars`
- R: `arrow`, `broom`, `data_table`, `janitor`, `styler`
@ -214,7 +215,8 @@ projectSettings = {
};
```
Use `lib.mkForce` to replace rather than append:
Use `lib.mkForce` to replace other `lang_packages` assignments; the built-in defaults still apply.
To exclude defaults, override `catPkgs.<cat>` instead:
```nix
projectSettings = {
@ -337,5 +339,5 @@ cats.nix ───────────────► config.cats │
- **Overlays** (`overlays/`) inject dependency package sets into nixpkgs (`rpkgs`, `baseRPackages`, `basePythonPackages`, plugins). Top-level `rWrapper` and `quarto` are compatibility conveniences, but `pkgs.rpkgs` is the canonical R surface for downstream configuration.
- **cat-packages.nix** is the single source of truth for per-category packages. Each list is gated by its cat toggle.
- **deps.nix** wires `catPkgs` into the wrapper's runtime PATH.
- **settings.lang_packages** holds the shared defaults used by local outputs and downstream module consumers.
- **settings.lang_packages** holds project-specific language libraries appended to the built-in `settings.langPackageDefaults`, used by local outputs and downstream module consumers.
- **flake.nix** exports `lib.eval`, `lib.mkWrapper`, `lib.devShellPackages`, and `lib.shellHook` as the canonical downstream helpers, and builds `packages.default` and `devShells.default` from the same module config.