Use crane to build the nix package

crane (https://github.com/ipetkov/crane) builds the dependencies separately and
stores them in the nix store, so they get reused on subsequent builds.

flake.lock

@@ -1,5 +1,32 @@
 {
   "nodes": {
+    "crane": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "rust-overlay": [
+          "rust-overlay"
+        ]
+      },
+      "locked": {
+        "lastModified": 1673056065,
+        "narHash": "sha256-a68tMDTDqdAauxq377ALl4Uwm6oh9MeoY2WbTYRWZoo=",
+        "owner": "ipetkov",
+        "repo": "crane",
+        "rev": "0144134311767fcee80213321f079a8ffa0b9cc1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "ipetkov",
+        "repo": "crane",
+        "type": "github"
+      }
+    },
     "flake-compat": {
       "flake": false,
       "locked": {
@@ -16,6 +43,22 @@
         "type": "github"
       }
     },
+    "flake-compat_2": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1668681692,
+        "narHash": "sha256-Ht91NGdewz8IQLtWZ9LCeNXMSXHUss+9COoqu6JLmXU=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "009399224d5e398d03b22badca40a37ac85412a1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
     "flake-utils": {
       "locked": {
         "lastModified": 1667395993,
@@ -52,27 +95,6 @@
         "type": "github"
       }
     },
-    "naersk": {
-      "inputs": {
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1662220400,
-        "narHash": "sha256-9o2OGQqu4xyLZP9K6kNe1pTHnyPz0Wr3raGYnr9AIgY=",
-        "owner": "nmattia",
-        "repo": "naersk",
-        "rev": "6944160c19cb591eb85bbf9b2f2768a935623ed3",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nmattia",
-        "ref": "master",
-        "repo": "naersk",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1669542132,
@@ -123,7 +145,7 @@
     },
     "pre-commit-hooks": {
       "inputs": {
-        "flake-compat": "flake-compat",
+        "flake-compat": "flake-compat_2",
         "flake-utils": [
           "flake-utils"
         ],
@@ -147,8 +169,8 @@
     },
     "root": {
       "inputs": {
+        "crane": "crane",
         "flake-utils": "flake-utils",
-        "naersk": "naersk",
         "nixpkgs": "nixpkgs",
         "pre-commit-hooks": "pre-commit-hooks",
         "rust-overlay": "rust-overlay"

flake.nix

@@ -3,10 +3,7 @@
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
     flake-utils.url = "github:numtide/flake-utils";
-    naersk = {
+
-      url = "github:nmattia/naersk/master";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
     rust-overlay = {
       url = "github:oxalica/rust-overlay";
       inputs.nixpkgs.follows = "nixpkgs";
@@ -16,48 +13,46 @@
       url = "github:cachix/pre-commit-hooks.nix";
       inputs.flake-utils.follows = "flake-utils";
     };
+
+    crane = {
+      url = "github:ipetkov/crane";
+      inputs.nixpkgs.follows = "nixpkgs";
+      inputs.flake-utils.follows = "flake-utils";
+      inputs.rust-overlay.follows = "rust-overlay";
+    };
   };
 
-  outputs = { self, nixpkgs, flake-utils, naersk, rust-overlay, pre-commit-hooks }:
+  outputs = { self, nixpkgs, flake-utils, rust-overlay, pre-commit-hooks, crane }:
     flake-utils.lib.eachDefaultSystem (system:
       let
         overlays = [ (import rust-overlay) ];
         pkgs = import nixpkgs { inherit system overlays; };
-        naersk-lib = pkgs.callPackage naersk { };
         rustToolchain =
           pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
 
+        crane-lib = (crane.mkLib pkgs).overrideToolchain rustToolchain;
+        src = crane-lib.cleanCargoSource ./.;
+        buildInputs = with pkgs; [
+          openssl
+        ] ++ lib.optionals pkgs.stdenv.isDarwin [ pkgs.libiconv ];
+        nativeBuildInputs = with pkgs; [
+          pkgconf
+        ];
+
+        cargoArtifacts = crane-lib.buildDepsOnly {
+          inherit src buildInputs nativeBuildInputs;
+        };
+
+        ha-now-playing = crane-lib.buildPackage {
+          inherit cargoArtifacts src buildInputs nativeBuildInputs;
+        };
+
       in
       {
         formatter = pkgs.nixpkgs-fmt;
 
         packages = {
-          ha-now-playing = (naersk-lib.override {
+          inherit ha-now-playing;
-            cargo = rustToolchain;
-            rustc = rustToolchain;
-          }).buildPackage
-            {
-              pname = "ha-now-playing";
-              root = ./.;
-
-              buildInputs = with pkgs; [
-                rustToolchain
-                openssl
-              ];
-              nativeBuildInputs = with pkgs; [
-                pkgconf
-                cargo-edit
-                cargo-expand
-                cargo-diet
-                cargo-feature
-                cargo-outdated
-                rust-analyzer
-                pre-commit
-                jq
-                gitflow
-                yaml-language-server
-              ];
-            };
         };
         packages.default = self.packages.${system}.ha-now-playing;
 
@@ -71,6 +66,17 @@
         };
 
         checks = {
+          inherit ha-now-playing;
+
+          ha-now-playing-clippy = crane-lib.cargoClippy {
+            inherit cargoArtifacts src buildInputs nativeBuildInputs;
+            cargoClippyExtraArgs = "--all-targets -- --deny warnings";
+          };
+
+          ha-now-playing-fmt = crane-lib.cargoFmt {
+            inherit src;
+          };
+
           pre-commit-check = pre-commit-hooks.lib.${system}.run {
             src = ./.;
             hooks = {
@@ -97,6 +103,7 @@
 
           name = "ha-now-playing";
           inputsFrom = [ self.packages.${system}.ha-now-playing ];
+          nativeBuildInputs = [ rustToolchain ];
         };
 
       });