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

  outputs = { self, nixpkgs, utils, naersk }:
    utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; };
        naersk-lib = pkgs.callPackage naersk { };
      in
      {
        packages.default = naersk-lib.buildPackage {
          src = pkgs.lib.sourceFilesBySuffices ./. [ ".rs" ".toml" ".lock" ];
          nativeBuildInputs = with pkgs; [ installShellFiles ];
          meta.mainProgram = "timers";
          postInstall = ''
            installShellCompletion --cmd timers \
              --bash <($out/bin/timers completions bash) \
              --fish <($out/bin/timers completions fish) \
              --zsh <($out/bin/timers completions zsh) \
          '';
        };
        devShells.default = with pkgs; mkShell {
          buildInputs = [ cargo rustc rustfmt pre-commit rustPackages.clippy rust-analyzer ];
          RUST_SRC_PATH = rustPlatform.rustLibSrc;
        };
      });
}