flake: drop flake-utils dependency

flake.lock

@@ -1,23 +1,5 @@
 {
   "nodes": {
-    "flake-utils": {
-      "inputs": {
-        "systems": "systems"
-      },
-      "locked": {
-        "lastModified": 1731533236,
-        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1740560979,
@@ -36,7 +18,6 @@
     },
     "root": {
       "inputs": {
-        "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs",
         "rust-overlay": "rust-overlay"
       }
@@ -60,21 +41,6 @@
         "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

@@ -3,7 +3,6 @@
 
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
-    flake-utils.url = "github:numtide/flake-utils";
     rust-overlay = {
       url = "github:oxalica/rust-overlay";
       inputs.nixpkgs.follows = "nixpkgs";
@@ -13,29 +12,27 @@
   outputs = {
     self,
     nixpkgs,
-    flake-utils,
     rust-overlay,
     ...
   }: let
+    inherit (nixpkgs) lib;
+    systems = [
+      "x86_64-linux"
+      "aarch64-linux"
+      "x86_64-darwin"
+      "aarch64-darwin"
+    ];
+    eachSystem = lib.genAttrs systems;
+    pkgsFor = eachSystem (system:
+      import nixpkgs {
+        localSystem.system = system;
+        overlays = [(import rust-overlay) self.overlays.helix];
+      });
     gitRev = self.rev or self.dirtyRev or null;
-  in
-    flake-utils.lib.eachDefaultSystem (system: let
-      pkgs = import nixpkgs {
-        inherit system;
-        overlays = [(import rust-overlay)];
-      };
-
-      # Get Helix's MSRV toolchain to build with by default.
-      msrvToolchain = pkgs.pkgsBuildHost.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
-      msrvPlatform = pkgs.makeRustPlatform {
-        cargo = msrvToolchain;
-        rustc = msrvToolchain;
-      };
   in {
-      packages = rec {
+    packages = eachSystem (system: {
-        helix = pkgs.callPackage ./default.nix {inherit gitRev;};
+      inherit (pkgsFor.${system}) helix;
-
+      /*
-        /**
       The default Helix build. Uses the latest stable Rust toolchain, and unstable
       nixpkgs.
 
@@ -47,21 +44,32 @@
 
       packages.${system}.default.overrideAttrs { buildType = "debug"; };
       */
-        default = helix;
+      default = self.packages.${system}.helix;
+    });
+    checks =
+      lib.mapAttrs (system: pkgs: let
+        # Get Helix's MSRV toolchain to build with by default.
+        msrvToolchain = pkgs.pkgsBuildHost.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
+        msrvPlatform = pkgs.makeRustPlatform {
+          cargo = msrvToolchain;
+          rustc = msrvToolchain;
         };
-
+      in {
-      checks.helix = self.outputs.packages.${system}.helix.override {
+        helix = self.packages.${system}.helix.override {
           buildType = "debug";
           rustPlatform = msrvPlatform;
         };
+      })
+      pkgsFor;
 
     # Devshell behavior is preserved.
-      devShells.default = let
+    devShells =
+      lib.mapAttrs (system: pkgs: {
+        default = let
           commonRustFlagsEnv = "-C link-arg=-fuse-ld=lld -C target-cpu=native --cfg tokio_unstable";
-        platformRustFlagsEnv = pkgs.lib.optionalString pkgs.stdenv.isLinux "-Clink-arg=-Wl,--no-rosegment";
+          platformRustFlagsEnv = lib.optionalString pkgs.stdenv.isLinux "-Clink-arg=-Wl,--no-rosegment";
         in
-        pkgs.mkShell
+          pkgs.mkShell {
-        {
             inputsFrom = [self.checks.${system}.helix];
             nativeBuildInputs = with pkgs;
               [
@@ -78,12 +86,16 @@
             '';
           };
       })
-    // {
+      pkgsFor;
-      overlays.default = final: prev: {
+
+    overlays = {
+      helix = final: prev: {
         helix = final.callPackage ./default.nix {inherit gitRev;};
       };
-    };
 
+      default = self.overlays.helix;
+    };
+  };
   nixConfig = {
     extra-substituters = ["https://helix.cachix.org"];
     extra-trusted-public-keys = ["helix.cachix.org-1:ejp9KQpR1FBI2onstMQ34yogDm4OgU2ru6lIwPvuCVs="];