changed flake.nix in template for nightly rust projects

home/Projects/optimized-pre-config-rust/flake.nix

@@ -1,50 +1,157 @@
 {
-  description = "A devShell for Rust Development";
+  description = "Flake for my-crate";
 
   inputs = {
-    nixpkgs.url      = "github:NixOS/nixpkgs/nixos-unstable";
-    rust-overlay.url = "github:oxalica/rust-overlay";
-    flake-utils.url  = "github:numtide/flake-utils";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+
+    crane = {
+      url = "github:ipetkov/crane";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    flake-utils.url = "github:numtide/flake-utils";
+
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs = {
+        nixpkgs.follows = "nixpkgs";
+        flake-utils.follows = "flake-utils";
+      };
+    };
+
+    advisory-db = {
+      url = "github:rustsec/advisory-db";
+      flake = false;
+    };
   };
 
-  outputs = { nixpkgs, rust-overlay, flake-utils, ... }:
+  outputs = { self, nixpkgs, crane, flake-utils, rust-overlay, advisory-db, ... }:
     flake-utils.lib.eachDefaultSystem (system:
       let
-        overlays = [ (import rust-overlay) ];
         pkgs = import nixpkgs {
-          inherit system overlays;
+          inherit system;
+          overlays = [ (import rust-overlay) ];
         };
-      in
-      with pkgs;
-      {
-        devShells.default = mkShell {
+
+        inherit (pkgs) lib;
+
+        rustCustomToolchain = pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
+
+        craneLib = (crane.mkLib pkgs).overrideToolchain rustCustomToolchain;
+        src = craneLib.cleanCargoSource (craneLib.path ./.);
+
+        # Common arguments can be set here to avoid repeating them later
+        commonArgs = {
+          inherit src;
+          strictDeps = true;
+
+          nativeBuildInputs = [
+            pkgs.pkg-config
+          ];
+
           buildInputs = [
-            just
-            (rust-bin.fromRustupToolchainFile ./rust-toolchain.toml)
-            mold
-            cargo-deny
+            # Add additional build inputs here
+            pkgs.openssl
+            pkgs.taplo
+          ] ++ 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";
+        };
+
+        # Build *just* the cargo dependencies, so we can reuse
+        # all of that work (e.g. via cachix) when running in CI
+        cargoArtifacts = craneLib.buildDepsOnly commonArgs;
+
+        # Build the actual crate itself, reusing the dependency
+        # artifacts from above.
+        my-crate = craneLib.buildPackage (commonArgs // {
+          inherit cargoArtifacts;
+        });
+      in
+      {
+        checks = {
+          # Build the crate as part of `nix flake check` for convenience
+          inherit my-crate;
+
+          # Run clippy (and deny all warnings) on the crate source,
+          # again, resuing the dependency artifacts from above.
+          #
+          # Note that this is done as a separate derivation so that
+          # we can block the CI if there are issues here, but not
+          # prevent downstream consumers from building our crate by itself.
+          my-crate-clippy = craneLib.cargoClippy (commonArgs // {
+            inherit cargoArtifacts;
+            cargoClippyExtraArgs = "--all-targets -- --deny warnings";
+          });
+
+          my-crate-doc = craneLib.cargoDoc (commonArgs // {
+            inherit cargoArtifacts;
+          });
+
+          # Check formatting
+          my-crate-fmt = craneLib.cargoFmt {
+            inherit src;
+          };
+
+          # Audit dependencies
+          my-crate-audit = craneLib.cargoAudit {
+            inherit src advisory-db;
+          };
+
+          # Audit licenses
+          my-crate-deny = craneLib.cargoDeny {
+            inherit src;
+          };
+
+          # Run tests with cargo-nextest
+          # Consider setting `doCheck = false` on `my-crate` if you do not want
+          # the tests to run twice
+          my-crate-nextest = craneLib.cargoNextest (commonArgs // {
+            inherit cargoArtifacts;
+            partitions = 1;
+            partitionType = "count";
+          });
+        };
+
+        packages = {
+          default = my-crate;
+        };
+
+        apps.default = flake-utils.lib.mkApp {
+          drv = my-crate;
+        };
+
+        devShells.default = craneLib.devShell {
+          # Inherit inputs from checks.
+          checks = self.checks.${system};
+
+          # Additional dev-shell environment variables can be set directly
+          # MY_CUSTOM_DEVELOPMENT_VAR = "something else";
+
+          # Extra inputs can be added here; cargo and rustc are provided by default.
+          packages = with pkgs; [
             cargo-watch
+            cargo-deny
             cargo-audit
             cargo-update
             cargo-edit
             cargo-outdated
             cargo-license
             cargo-tarpaulin
-            cargo-cross
             cargo-zigbuild
             cargo-nextest
             cargo-spellcheck
             cargo-modules
             cargo-bloat
             cargo-unused-features
-            taplo
             bacon
             helix
-            pkg-config
-            openssl
-            sqlite
+            just
           ];
         };
-      }
-    );
+      });
 }