deadnix/flake.nix

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    utils.url = "github:numtide/flake-utils";
    naersk = {
      url = "github:nix-community/naersk/master";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, nixpkgs, utils, naersk }:
    let
      inherit (nixpkgs) lib;
      deadnixLambda = pkgs:
        let
          naersk-lib = pkgs.callPackage naersk { };
        in
        naersk-lib.buildPackage {
          pname = "deadnix";
          root = ./.;
          checkInputs = [ pkgs.rustPackages.clippy ];
          doCheck = true;
          cargoTestCommands = x:
            x ++ [
              ''cargo clippy --all --all-features --tests -- \
                -D clippy::pedantic \
                -D warnings \
                -A clippy::module-name-repetitions \
                -A clippy::too-many-lines \
                -A clippy::cast-possible-wrap \
                -A clippy::cast-possible-truncation \
                -A clippy::nonminimal_bool || true''
            ];
          meta.description = "Scan Nix files for dead code";
        };
    in
    utils.lib.eachDefaultSystem
      (system:
        let
          pkgs = nixpkgs.legacyPackages.${system};
        in
        {
          packages = {
            default = self.packages."${system}".deadnix;
            deadnix = deadnixLambda pkgs;
          };

          apps.default = utils.lib.mkApp {
            drv = self.packages."${system}".default;
          };

          devShells.default = with pkgs; mkShell {
            nativeBuildInputs = [ cargo rustc rustfmt rustPackages.clippy rust-analyzer ];
            RUST_SRC_PATH = rustPlatform.rustLibSrc;
          };
        })
    // {
      overlays.default = (_: prev: {
        deadnix = deadnixLambda prev;
      });
    };
}