{
  description = "purr - a web application for generating and sharing secrets ";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};

        haskellPackages = pkgs.haskellPackages;

        jailbreakUnbreak = pkg:
          pkgs.haskell.lib.doJailbreak (pkg.overrideAttrs (_: { meta = { }; }));

        packageName = "purr";
      in {
        packages.${packageName} =
          haskellPackages.callCabal2nix packageName self rec {
            crypto-simple = 
              pkgs.haskell.lib.dontCheck haskellPackages.crypto-simple;
          };

        packages.default = self.packages.${system}.${packageName};
        defaultPackage = self.packages.${system}.default;

        devShells.default = pkgs.mkShell {
          buildInputs = with pkgs; [
            ghcid
            cabal-install
          ];
          inputsFrom = map (__getAttr "env") (__attrValues self.packages.${system});
        };
        devShell = self.devShells.${system}.default;
        packages.purrImage = pkgs.dockerTools.buildImage {
          name = "purr";
          copyToRoot = pkgs.buildEnv {
            name = "image-root";
            paths = [ self.packages.${system}.default ];
            pathsToLink = [ "/bin" ];
          };
          tag = "latest";
          config = {
            Cmd = [
              "/bin/Purr-musl"
            ];
            ExposedPorts = {
              "3000/tcp" = {};
            };
            extraCommands = ''
            '';
          };
        };
      });
}