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{
  description = "development environment for scanloop";

  inputs.nixpkgs.url = "github:NixOS/nixpkgs";

  outputs =
    { self, nixpkgs }:
    let
      system = "x86_64-linux";
      pkgs = import nixpkgs {
        inherit system;
        config.allowUnfree = true; # for CUDA
      };
      pytorchWithCuda = pkgs.python313Packages.pytorchWithCuda;
      pythonEnv = pkgs.python313.withPackages (
        ps: with ps; [
          pytorchWithCuda
          opencv4
          layoutparser
          detectron2
          torchvision
          pytesseract
        ]
      );
    in
    {
      devShells.${system}.default = pkgs.mkShell {
        buildInputs = with pkgs; [
          # for Go programs using gocv
          pkg-config
          opencv
          pythonEnv
          self.packages.${system}.img2txt
        ];
      };

      packages.${system}.img2txt = pkgs.writeShellApplication {
        name = "scanloop-img2txt";
        runtimeInputs = [ pythonEnv ];
        text = ''
          exec ${pythonEnv.interpreter} ${self}/_layoutparser/img2txt.py "$@"
        '';
      };

      apps.${system}.img2txt = {
        type = "app";
        program = "${self.packages.${system}.img2txt}/bin/scanloop-img2txt";
      };
    };
}