bunbun/flake.nix

{
  description = "Rust development environment for bunbun using fenix";
  inputs = {
    fenix = { url = "github:nix-community/fenix"; inputs.nixpkgs.follows = "nixpkgs-unstable"; };
    utils.url = "github:numtide/flake-utils";
    nixpkgs-unstable.url = "github:nixos/nixpkgs/nixos-unstable";
  };

  outputs = { self, nixpkgs-unstable, utils, fenix, ... }:
    utils.lib.eachDefaultSystem
    (
      system: let
        pkgs = import nixpkgs-unstable { inherit system; overlays = [fenix.overlays.default]; };
        toolchain = pkgs.fenix.complete;
      in rec
      {
        packages.default =
          (pkgs.makeRustPlatform {
            inherit (toolchain) cargo rustc;
          })
          .buildRustPackage {
            pname = "bunbun";
            version = "1.3.0";
            src = ./.;
            cargoLock.lockFile = ./Cargo.lock;
          };
        apps.default = utils.lib.mkApp {drv = packages.default;};
        devShells.default = pkgs.mkShell rec {
          buildInputs = with pkgs; [
            (with toolchain; [ cargo rustc rust-src clippy rustfmt ])
          ];
          RUST_SRC_PATH = "${toolchain.rust-src}/lib/rustlib/src/rust/library";
        };
      }
    );
}