python/flake.nix


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{
  description = ""; # TODO: fill this out

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";

    mach-nix.url = "github:davhau/mach-nix";
  };

  outputs = {
    self,
    nixpkgs,
    mach-nix,
    flake-utils,
    ...
  }: let
    pythonVersion = "python39"; # TODO: update if necessary
  in
    flake-utils.lib.eachDefaultSystem (
      system: let
        pkgs = nixpkgs.legacyPackages.${system};
        mach = mach-nix.lib.${system};

        pythonApp = mach.buildPythonApplication ./.;
        pythonAppEnv = mach.mkPython {
          python = pythonVersion;
          requirements = builtins.readFile ./requirements.txt;
        };
        pythonAppImage = pkgs.dockerTools.buildLayeredImage {
          name = pythonApp.pname;
          contents = [pythonApp];
          config.Cmd = ["${pythonApp}/bin/main"];
        };
      in {
        packages = {
          image = pythonAppImage;
          pythonPkg = pythonApp;

          default = self.packages.pythonPkg;
        };

        apps.default = {
          type = "app";
          program = "${self.packages.pythonPkg}/bin/main";
        };

        devShells.default = pkgs.mkShell {
          packages = with pkgs; [
            pythonAppEnv
            black
            ruff
            python310Packages.python-lsp-server
            gnat
          ];

          env = {
            LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath [
              pkgs.stdenv.cc.cc
            ];

            PYTHONPATH = "${pythonAppEnv}/bin/python";
          };
        };
      }
    );
}