hyperhive/nix/checks.nix

# Flake checks: formatting, the clippy gate, the workspace test run,
# the nix-options docs eval, the hivectl CLI-reference freshness check,
# and the module-eval property table. Imported per system from flake.nix.
{
  pkgs,
  craneLib,
  rust,
  self,
  system,
  treefmt-eval,
  nixosSystem,
}:
let
  inherit (rust) cleanSrc cargoArtifacts nativeBuildInputs;
in
{
  formatting = treefmt-eval.config.build.check self;

  # The only check here that covers **nix**. Every other one is a Rust
  # derivation, so a `.nix`-only diff moves no hash and the whole set is
  # cache hits — green without evaluating what changed. See the file's
  # header for what belongs in it and what needs something that executes
  # rather than evaluates.
  module-eval = import ./module-eval.nix {
    inherit pkgs self nixosSystem;
    inherit (pkgs) lib;
  };

  # Clippy via crane's first-class `cargoClippy` builder. Reuses the
  # shared `cargoArtifacts` (deps already built) and runs
  # `cargo clippy --workspace --all-targets` directly.
  #
  # `-D warnings` makes every rustc/clippy warning a hard CI gate.
  # Pedantic is gated too, deliberately: the workspace lint table
  # (Cargo.toml) sets `pedantic = deny`, so pedantic lints are errors
  # both locally and here. We want that — a toolchain bump that adds a
  # new pedantic lint reds the build until the code is updated, rather
  # than sliding in unnoticed. (The lint table allows a few noisy
  # pedantic lints explicitly, e.g. `must_use_candidate`; those keep
  # their allow via higher priority.)
  clippy = craneLib.cargoClippy {
    src = cleanSrc;
    inherit cargoArtifacts nativeBuildInputs;
    pname = "hyperhive-workspace";
    version = "0.1.0";
    cargoClippyExtraArgs = "--workspace --all-targets -- -D warnings";
  };

  # `cargo test --workspace` lifted out of the package builds so the
  # `hyperhive-assets` dep (which `hive-agent::prompt::tests`
  # needs via `HIVE_ASSETS_DIR` to assert against the actual
  # production prompt template) is scoped to this one check
  # instead of bleeding into the binary derivations' input
  # hash. Net: editing `hive-agent/prompts/system.md` still
  # rebuilds this test check (correct — the tests assert
  # against its wording), but `packages.default` and the
  # per-container toplevels stay fully cached.
  cargo-test = craneLib.cargoTest {
    src = cleanSrc;
    inherit cargoArtifacts nativeBuildInputs;
    pname = "hyperhive-workspace";
    version = "0.1.0";
    cargoTestExtraArgs = "--workspace";
    HIVE_ASSETS_DIR = "${self.packages.${system}.assets}/share/hyperhive";
  };

  # Rustdoc gate. Builds the workspace's docs and turns rustdoc's own
  # lints into hard failures, so a `[`Foo`]` pointing at a renamed,
  # moved or deleted item reds the PR instead of silently rendering as
  # plain text.
  #
  # Why this needs to exist at all: nothing else reads doc-comments.
  # Clippy doesn't check intra-doc links, `cargo test` doesn't, and no
  # other check builds docs — so a dangling pointer had no discoverer
  # but a human happening to read the comment. That matters more here
  # than in most repos, because the convention is to put a thing's
  # authoritative description in one doc-comment and link to it from
  # everywhere else: the design leans on the pointers being real, and a
  # dangling link is worse than no link, since it names something and
  # so sends the reader looking.
  #
  # `--document-private-items` is load-bearing, not thoroughness for its
  # own sake: most of this workspace's doc-comments live on private
  # items and `//!` module headers. Without it rustdoc checks a small
  # fraction of the links and the gate would sit green while the rot
  # continued.
  #
  # ⚠️ This does NOT reuse the `cargoArtifacts` the way `clippy` and
  # `cargo-test` do — it takes them, but rustdoc needs its own flavour
  # of dependency metadata, which `cargo build` does not produce. So a
  # `--no-deps` docs build still *compiles* dependencies it will never
  # document (matrix-sdk dominates), and this check costs its own build
  # rather than riding the others' cache.
  docs-rustdoc = craneLib.cargoDoc {
    src = cleanSrc;
    inherit cargoArtifacts nativeBuildInputs;
    pname = "hyperhive-workspace";
    version = "0.1.0";
    cargoDocExtraArgs = "--workspace --no-deps --document-private-items";
    # The lints themselves are NOT set here — they live in
    # `[workspace.lints.rustdoc]` in the root Cargo.toml, alongside the
    # clippy table, and every crate inherits them via `[lints] workspace
    # = true`. That way a plain local `cargo doc` fails exactly the way
    # this check does; setting them as `RUSTDOCFLAGS` here would make CI
    # the only place the gate exists.
  };

  # Nix options docs evaluation. Cheap: pulls in `nixosOptionsDoc` +
  # the host module's stub eval, no rust or frontend deps. CI fails
  # fast if a module change breaks option declarations or the doc
  # rendering. Reuses the `packages.<system>.docs` derivation so the
  # per-system eval of nix/docs/default.nix happens once.
  inherit (self.packages.${system}) docs;

  # Frontend build. Builds the `hyperhive-frontend` npm package, whose
  # fixed-output npm-deps derivation pins `npmDepsHash`
  # (nix/packages/frontend.nix). No other check exercises that FOD:
  # `cargo-test` forces `.#assets`, but `assets` carries no frontend
  # dependency, so without this check a stale `npmDepsHash` after a
  # `package-lock.json` bump that forgets to recompute it sails through
  # every PR and only breaks when the host toplevel is built on deploy.
  # Reusing the already-defined `packages.<system>.frontend` derivation
  # makes such a hash mismatch a red PR instead of a red main.
  #
  # `swarm-ui` alongside it for the same FOD-staleness reason (shares
  # the same lockfile / `npmDepsHash`, see nix/packages/swarm-ui.nix) —
  # plus, since it's not in `packages.default`'s dependency closure like
  # `frontend` is, this is also the only thing that actually *builds*
  # it in CI rather than just evaluating it (`nix flake check` doesn't
  # build every `packages.<system>.*` output on its own).
  inherit (self.packages.${system}) frontend swarm-ui;

  # TypeScript type-check for `swarm-ui` (`npm run typecheck`, i.e.
  # `tsc --noEmit`). esbuild only strips types without checking them
  # (see `frontend/packages/swarm-ui/build.mjs`'s own comment), so
  # without this a real type error would still build clean and pass
  # every other check. Argus flagged the gap on this PR's review;
  # wiring it in now per mara's follow-up ask on the same PR, rather
  # than leaving it as a someday-issue.
  #
  # A separate `buildNpmPackage` derivation rather than folding into
  # `swarm-ui` itself: this one's whole job is to *fail loudly* on a
  # type error, and `npm ci` + `tsc` needs `typescript` in
  # `node_modules`, which `swarm-ui.nix`'s actual build doesn't need
  # (esbuild transpiles TS without it) — no reason to make the real
  # build depend on the dev-only type-checker.
  swarm-ui-typecheck = pkgs.buildNpmPackage {
    pname = "hyperhive-swarm-ui-typecheck";
    version = "0.0.0";
    src = ../frontend;

    # Same lockfile as `frontend`/`swarm-ui` above — recompute in
    # lockstep with those two whenever `frontend/package-lock.json`
    # changes (`prefetch-npm-deps frontend/package-lock.json`).
    npmDepsHash = "sha256-LIwW5Nn9cSqJHCm1czPIVxQdP5OqWk7U/4kvkwaj2ts=";

    buildPhase = ''
      runHook preBuild
      npm run typecheck --workspace=packages/swarm-ui
      runHook postBuild
    '';

    dontNpmInstall = true;
    installPhase = ''
      runHook preInstall
      mkdir -p $out
      touch $out/ok
      runHook postInstall
    '';
  };

  # `hivectl` CLI reference freshness check. The committed
  # markdown at `docs/tools/hivectl-cli.md` is the rendered
  # output of the hidden `hivectl markdown-docs` subcommand
  # (clap-markdown walks the binary's own command tree). This
  # check regenerates it from the built binary and fails if the
  # committed copy drifted — so a verb / flag / help-string edit
  # that forgets to refresh the doc is caught in CI. Reuses the
  # already-built `packages.<system>.default` (no extra compile).
  # Regenerate locally with:
  #   nix build .#default
  #   ./result/bin/hivectl markdown-docs > docs/tools/hivectl-cli.md
  hivectl-docs = pkgs.runCommand "hivectl-docs-fresh" { nativeBuildInputs = [ pkgs.diffutils ]; } ''
    ${self.packages.${system}.default}/bin/hivectl markdown-docs > generated.md
    if ! diff -u ${../docs/tools/hivectl-cli.md} generated.md; then
      echo "" >&2
      echo "ERROR: docs/tools/hivectl-cli.md is out of date — regenerate it:" >&2
      echo "  nix build .#default && ./result/bin/hivectl markdown-docs > docs/tools/hivectl-cli.md" >&2
      exit 1
    fi
    touch "$out"
  '';

  # `swarmctl` CLI reference freshness check — same shape as
  # `hivectl-docs` above, `swarmctl markdown-docs` (clap-markdown over
  # its own command tree) instead. Reuses `packages.<system>.swarmctl`
  # (already built as its own package, out of `daemonBins` — see
  # nix/packages/default.nix's comment on it).
  swarmctl-docs = pkgs.runCommand "swarmctl-docs-fresh" { nativeBuildInputs = [ pkgs.diffutils ]; } ''
    ${self.packages.${system}.swarmctl}/bin/swarmctl markdown-docs > generated.md
    if ! diff -u ${../docs/tools/swarmctl-cli.md} generated.md; then
      echo "" >&2
      echo "ERROR: docs/tools/swarmctl-cli.md is out of date — regenerate it:" >&2
      echo "  nix build .#swarmctl && ./result/bin/swarmctl markdown-docs > docs/tools/swarmctl-cli.md" >&2
      exit 1
    fi
    touch "$out"
  '';
}