build: use flake-parts

flake.lock

@@ -108,21 +108,21 @@
         "type": "github"
       }
     },
-    "flake-utils": {
+    "flake-parts_2": {
       "inputs": {
-        "systems": "systems"
+        "nixpkgs-lib": "nixpkgs-lib"
       },
       "locked": {
-        "lastModified": 1731533236,
-        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "lastModified": 1772408722,
+        "narHash": "sha256-rHuJtdcOjK7rAHpHphUb1iCvgkU3GpfvicLMwwnfMT0=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "f20dc5d9b8027381c474144ecabc9034d6a839a3",
         "type": "github"
       },
       "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
         "type": "github"
       }
     },
@@ -231,6 +231,21 @@
         "type": "github"
       }
     },
+    "nixpkgs-lib": {
+      "locked": {
+        "lastModified": 1772328832,
+        "narHash": "sha256-e+/T/pmEkLP6BHhYjx6GmwP5ivonQQn0bJdH9YrRB+Q=",
+        "owner": "nix-community",
+        "repo": "nixpkgs.lib",
+        "rev": "c185c7a5e5dd8f9add5b2f8ebeff00888b070742",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nixpkgs.lib",
+        "type": "github"
+      }
+    },
     "nixpkgs_2": {
       "locked": {
         "lastModified": 1774386573,
@@ -276,7 +291,7 @@
     "root": {
       "inputs": {
         "crate2nix": "crate2nix",
-        "flake-utils": "flake-utils",
+        "flake-parts": "flake-parts_2",
         "nixpkgs": "nixpkgs_2",
         "rust-overlay": "rust-overlay"
       }
@@ -300,21 +315,6 @@
         "repo": "rust-overlay",
         "type": "github"
       }
-    },
-    "systems": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
     }
   },
   "root": "root",

flake.nix

@@ -3,38 +3,34 @@
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-parts.url = "github:hercules-ci/flake-parts";
     rust-overlay = {
       url = "github:oxalica/rust-overlay";
       inputs.nixpkgs.follows = "nixpkgs";
     };
-    flake-utils.url = "github:numtide/flake-utils";
     crate2nix = {
       url = "github:nix-community/crate2nix";
       inputs.nixpkgs.follows = "nixpkgs";
     };
   };
 
-  nixConfig = {
-    extra-trusted-public-keys = "eigenvalue.cachix.org-1:ykerQDDa55PGxU25CETy9wF6uVDpadGGXYrFNJA3TUs=";
-    extra-substituters = "https://eigenvalue.cachix.org";
-    allow-import-from-derivation = true;
-  };
-
-  outputs = {
-    crate2nix,
-    flake-utils,
-    nixpkgs,
+  outputs = inputs @ {
+    flake-parts,
     rust-overlay,
+    crate2nix,
     ...
   }:
-    flake-utils.lib.eachDefaultSystem (
-      system: let
-        # Overlay pkgs with rust-bin
-        overlays = [(import rust-overlay)];
-        pkgs = import nixpkgs {
-          inherit system overlays;
-        };
+    flake-parts.lib.mkFlake {inherit inputs;} (top: {
+      systems = [
+        "x86_64-linux"
+      ];
 
+      perSystem = {
+        self',
+        pkgs,
+        system,
+        ...
+      }: let
         # Use rust-bin to generate the toolchain from rust-toolchain.toml
         rust-toolchain = pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
 
@@ -77,37 +73,41 @@
         cargoNix = import generatedCargoNix {
           inherit pkgs buildRustCrateForPkgs;
         };
-      in rec {
-        apps = rec {
+      in {
+        _module.args.pkgs = import inputs.nixpkgs {
+          inherit system;
+          overlays = [rust-overlay.overlays.default];
+        };
+
+        packages.lispers = cargoNix.workspaceMembers.lispers.build;
+        packages.default = self'.packages.lispers;
+        apps = {
           lisp_demo = {
             type = "app";
-            program = "${packages.default}/bin/lisp_demo";
+            program = "${self'.packages.lispers}/bin/lisp_demo";
           };
           repl = {
             type = "app";
-            program = "${packages.default}/bin/repl";
+            program = "${self'.packages.lispers}/bin/repl";
           };
           rt_demo = {
             type = "app";
-            program = "${packages.default}/bin/rt_demo";
+            program = "${self'.packages.lispers}/bin/rt_demo";
           };
           rt_demo_lisp = {
             type = "app";
-            program = "${packages.default}/bin/rt_lisp_demo";
+            program = "${self'.packages.lispers}/bin/rt_lisp_demo";
           };
           rt_interp = {
             type = "app";
-            program = "${packages.default}/bin/rt_interp";
+            program = "${self'.packages.lispers}/bin/rt_interp";
           };
-          default = rt_demo_lisp;
+          default = self'.apps.rt_demo_lisp;
         };
-        packages = rec {
-          lispers = cargoNix.workspaceMembers.lispers.build;
-          default = lispers;
+
+        devShells.default = pkgs.mkShell {
+          buildInputs = [rust-toolchain];
         };
-        devShell = pkgs.mkShell {
-          buildInputs = [rust-toolchain pkgs.cargo-edit pkgs.pkg-config pkgs.ffmpeg.dev pkgs.ffmpeg];
-        };
-      }
-    );
+      };
+    });
 }