feat: init

templates/default/nix/packages/rust-workspace.nix

@@ -0,0 +1,83 @@
+/*
+  This exposes all crates in the workspace as a single package attribute.
+  It also enforces various tests.
+
+  Losely following the tutorial at https://crane.dev/examples/quick-start-workspace.html
+*/
+
+{
+  flake,
+  pkgs,
+  system,
+  ...
+}:
+let
+  craneLib = flake.lib.mkCraneLib { inherit pkgs system; };
+  src = craneLib.cleanCargoSource flake;
+  commonArgs = {
+    inherit src;
+    strictDeps = true;
+
+    buildInputs = pkgs.lib.optionals pkgs.stdenv.isDarwin [
+      # Additional darwin specific inputs can be set here
+      pkgs.libiconv
+    ];
+
+    # Additional environment variables can be set directly
+    # MY_CUSTOM_VAR = "some value";
+
+    meta.platforms = pkgs.lib.platforms.linux;
+  };
+
+  # Build *just* the cargo dependencies (of the entire workspace),
+  # so we can reuse all of that work (e.g. via cachix) when running in CI
+  # It is *highly* recommended to use something like cargo-hakari to avoid
+  # cache misses when building individual top-level-crates
+  cargoArtifacts = craneLib.buildDepsOnly commonArgs;
+in
+craneLib.cargoBuild (
+  commonArgs
+  // {
+    inherit cargoArtifacts;
+
+    # NB: we disable tests since we'll run them all via cargo-nextest
+    doCheck = false;
+
+    passthru.tests = {
+      clippy = craneLib.cargoClippy (
+        commonArgs
+        // {
+          inherit cargoArtifacts;
+          cargoClippyExtraArgs = "--all-targets -- --deny warnings";
+        }
+      );
+
+      doc = craneLib.cargoDoc (
+        commonArgs
+        // {
+          inherit cargoArtifacts;
+        }
+      );
+
+      # Audit licenses
+      deny = craneLib.cargoDeny {
+        inherit src;
+      };
+
+      nextest = craneLib.cargoNextest (
+        commonArgs
+        // {
+          inherit cargoArtifacts;
+
+          nativeBuildInputs = [
+            # native test binaries go here
+          ];
+          partitions = 1;
+          partitionType = "count";
+        }
+      );
+
+    };
+
+  }
+)