Add Nix flake: crane + fenix build, treefmt-nix formatting

Uses flake-parts to organize outputs, with nix/rust.nix defining a single craneLib/toolchain/commonArgs environment shared by the package build (nix/rust.nix) and the dev shell (nix/devshell.nix), so both stay close to identical. Deps are cached separately from the crate itself via crane's buildDepsOnly, giving incremental rebuilds. Checks cover clippy, rustfmt, cargo-doc, cargo-audit, and nextest; treefmt-nix wires up `nix fmt` for Rust/Nix/TOML files. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018ALEXkc7pTro7tF1WcUuKb
2026-08-10 23:58:00 +08:00
parent 979e77571f
commit 840cea1f10
6 changed files with 393 additions and 0 deletions
@@ -0,0 +1,80 @@
+{
+  description = "rust_template — Rust project built with crane + fenix, formatted with treefmt";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    flake-parts.url = "github:hercules-ci/flake-parts";
+
+    crane.url = "github:ipetkov/crane";
+
+    fenix = {
+      url = "github:nix-community/fenix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    treefmt-nix = {
+      url = "github:numtide/treefmt-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    advisory-db = {
+      url = "github:rustsec/advisory-db";
+      flake = false;
+    };
+  };
+
+  nixConfig = {
+    extra-substituters = [ "https://nix-community.cachix.org" ];
+    extra-trusted-public-keys = [
+      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+    ];
+  };
+
+  outputs =
+    inputs@{ flake-parts, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      systems = [
+        "x86_64-linux"
+        "aarch64-linux"
+        "x86_64-darwin"
+        "aarch64-darwin"
+      ];
+
+      imports = [
+        inputs.treefmt-nix.flakeModule
+        ./nix/treefmt.nix
+      ];
+
+      perSystem =
+        {
+          pkgs,
+          system,
+          lib,
+          ...
+        }:
+        let
+          rust = import ./nix/rust.nix {
+            inherit
+              inputs
+              pkgs
+              system
+              lib
+              ;
+          };
+        in
+        {
+          packages.default = rust.package;
+
+          checks = rust.checks // {
+            rust_template = rust.package;
+          };
+
+          apps.default = {
+            type = "app";
+            program = "${rust.package}/bin/rust_template";
+          };
+
+          devShells.default = import ./nix/devshell.nix { inherit pkgs lib rust; };
+        };
+    };
+}