flake.lock

@@ -1,5 +1,20 @@
 {
   "nodes": {
+    "crane": {
+      "locked": {
+        "lastModified": 1785782307,
+        "narHash": "sha256-MPaRdVkf6zZP5fCPxYCi8Dr4pZzgmXzg8T9nVEbp3Mw=",
+        "owner": "ipetkov",
+        "repo": "crane",
+        "rev": "2c71e194474d13de031d729b729c968ddbe3507f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "ipetkov",
+        "repo": "crane",
+        "type": "github"
+      }
+    },
     "flake-utils": {
       "inputs": {
         "systems": "systems"
@@ -36,6 +51,7 @@
     },
     "root": {
       "inputs": {
+        "crane": "crane",
         "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs"
       }

flake.nix

@@ -2,6 +2,8 @@
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
 
+    crane.url = "github:ipetkov/crane";
+
     flake-utils.url = "github:numtide/flake-utils";
   };
 
@@ -12,6 +14,7 @@
       let
         pkgs = import inputs.nixpkgs { inherit system; };
         lib = pkgs.lib;
+        craneLib = inputs.crane.mkLib pkgs;
 
         cargoToml = fromTOML (builtins.readFile ./Cargo.toml);
         name = cargoToml.package.name;
@@ -44,6 +47,12 @@
           src = ./.;
         };
 
+        # Build *just* the cargo dependencies,
+        # to reuse them for build and test derivations.
+        cargoArtifacts = craneLib.buildDepsOnly commonArgs;
+
+        # Build the actual crate itself,
+        # reusing the dependency artifacts from above.
         crate =
           let
             desktopItem = pkgs.makeDesktopItem {
@@ -53,11 +62,10 @@
               exec = name;
             };
           in
-          pkgs.rustPlatform.buildRustPackage (
+          craneLib.buildPackage (
             commonArgs
             // {
-              inherit name;
+              inherit cargoArtifacts;
-              cargoLock.lockFile = ./Cargo.lock;
 
               nativeBuildInputs = commonArgs.nativeBuildInputs ++ [
                 pkgs.autoPatchelfHook
@@ -81,18 +89,22 @@
       {
         packages.default = crate;
 
-        devShells.default = pkgs.mkShell {
+        checks = {
+          crate-clippy = craneLib.cargoClippy (
+            commonArgs
+            // {
+              inherit cargoArtifacts;
+
+              cargoClippyExtraArgs = "-- --deny warnings";
+            }
+          );
+        };
+
+        devShells.default = craneLib.devShell {
           LD_LIBRARY_PATH = lib.makeLibraryPath dlDeps;
 
           inputsFrom = [ crate ];
-
+          packages = [ pkgs.rust-analyzer ];
-          packages = with pkgs; [
-            rustc
-            cargo
-            clippy
-            rustfmt
-            rust-analyzer
-          ];
         };
       }
     );