{
  inputs = { nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable"; };

  outputs = { self, nixpkgs }:
    let
      pkgs = nixpkgs.legacyPackages.x86_64-linux;
      inherit (pkgs) lib;
      system = "x86_64-linux";
    in rec {
      formatter."${system}" = pkgs.nixfmt-rfc-style;
      devShells."${system}".default =
        pkgs.mkShell { packages = [ pkgs.mkvtoolnix-cli ]; };

      overlays.default = final: prev: {
        subtitle-merge = final.rustPlatform.buildRustPackage {
          name = "subtitle-merge";
          version = "0.1";
          src = ./.;
          cargoLock.lockFile = ./Cargo.lock;
          buildInputs = builtins.attrValues {
            inherit (final) installShellFiles mkvtoolnix-cli;
          };

          postInstall = ''
            installShellCompletion --cmd subtitle-merge \
              --bash ./target/release-tmp/build/*/out/subtitle-merge.bash \
              --fish ./target/release-tmp/build/*/out/subtitle-merge.fish \
              --zsh ./target/release-tmp/build/*/out/_subtitle-merge
          '';
        };
      };

      packages."${system}" = rec {
        inherit (overlays.default pkgs pkgs) subtitle-merge;
        default = subtitle-merge;
      };
    };
}