WIP: build(nix): Fix nix builds and add CI

.github/workflows/ci.yml

@@ -287,6 +287,28 @@ jobs:
         if: always()
         run: Remove-Item -Path "${{ env.CARGO_HOME }}/config.toml"  -Force
 
+  nix:
+    timeout-minutes: 120
+    strategy:
+      matrix:
+        system:
+          - os: macOS
+            runner: self-hosted
+            sandbox: false
+          - os: Linux
+            runner: buildjet-16vcpu-ubuntu-2204
+            sandbox: true
+    if: github.repository_owner == 'zed-industries'
+    runs-on: ${{ matrix.system.runner }}
+    name: (${{ matrix.system.os }}) Build Nix package
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+      - name: Setup nix
+        uses: samueldr/lix-gha-installer-action@54a4026004084aa2cf8d18335cc01b06a2e53b74 # v2025-01-21.prerelease
+      - name: Build Zed
+        run: nix build .#zed-editor.debug --option sandbox ${{ matrix.system.sandbox }}
+
   bundle-mac:
     timeout-minutes: 120
     name: Create a macOS bundle

flake.nix

@@ -3,65 +3,29 @@
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs?ref=nixos-unstable";
+    flake-parts = {
+      url = "github:hercules-ci/flake-parts";
+      inputs.nixpkgs-lib.follows = "nixpkgs";
+    };
+    systems.url = "github:nix-systems/default";
     rust-overlay = {
       url = "github:oxalica/rust-overlay";
       inputs.nixpkgs.follows = "nixpkgs";
     };
-    crane.url = "github:ipetkov/crane";
-    flake-compat.url = "github:edolstra/flake-compat";
+    treefmt-nix = {
+      url = "github:numtide/treefmt-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
-
   outputs =
-    {
-      nixpkgs,
-      rust-overlay,
-      crane,
-      ...
-    }:
-    let
-      systems = [
-        "x86_64-linux"
-        "x86_64-darwin"
-        "aarch64-linux"
-        "aarch64-darwin"
+    { flake-parts, ... }@inputs:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      systems = import inputs.systems;
+      imports = [
+        ./nix/overlays.nix
+        ./nix/package.nix
+        ./nix/shell.nix
+        ./nix/treefmt.nix
       ];
-
-      overlays = {
-        rust-overlay = rust-overlay.overlays.default;
-        rust-toolchain = final: prev: {
-          rustToolchain = final.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
-        };
-        zed-editor = final: prev: {
-          zed-editor = final.callPackage ./nix/build.nix {
-            crane = crane.mkLib final;
-            rustToolchain = final.rustToolchain;
-          };
-        };
-      };
-
-      mkPkgs =
-        system:
-        import nixpkgs {
-          inherit system;
-          overlays = builtins.attrValues overlays;
-        };
-
-      forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f (mkPkgs system));
-    in
-    {
-      packages = forAllSystems (pkgs: {
-        zed-editor = pkgs.zed-editor;
-        default = pkgs.zed-editor;
-      });
-
-      devShells = forAllSystems (pkgs: {
-        default = import ./nix/shell.nix { inherit pkgs; };
-      });
-
-      formatter = forAllSystems (pkgs: pkgs.nixfmt-rfc-style);
-
-      overlays = overlays // {
-        default = nixpkgs.lib.composeManyExtensions (builtins.attrValues overlays);
-      };
     };
 }