rust-nix-template/flake.nix

{
  description = "bouncy";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    rust-overlay.url = "github:oxalica/rust-overlay";
    utils.url = "github:numtide/flake-utils";
    naersk.url = "github:nmattia/naersk";
    flake-compat = {
      url = "github:edolstra/flake-compat";
      flake = false;
    };
  };

  outputs = { self, nixpkgs, utils, rust-overlay, naersk, ... }:
    utils.lib.eachDefaultSystem
      (system:
        let 
          pkgs = import nixpkgs {
            inherit system;
            overlays = [ 
              rust-overlay.overlay
              (self: super: {
                # Because rust-overlay bundles multple rust packages into one
                # derivation, specify that mega-bundle here, so that naersk
                # will use them automatically.
                rustc = self.rust-bin.stable.latest.default;
                cargo = self.rust-bin.stable.latest.default;
              })
            ];
          };
          naersk-lib = naersk.lib."${system}";
        in rec {
          # `nix build`
          packages.bouncy = naersk-lib.buildPackage {
            pname = "bouncy";
            root = ./.;
          };
          defaultPackage = packages.bouncy;

          # `nix run`
          apps.bouncy = utils.lib.mkApp {
            drv = packages.bouncy;
          };
          defaultApp = apps.bouncy;

          # `nix develop`
          devShell = pkgs.mkShell {
            nativeBuildInputs = with pkgs; [ rustc cargo ];
            RUST_SRC_PATH = "${pkgs.rust.packages.stable.rustPlatform.rustLibSrc}";
          };
        }
      );
}