flake.nix

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

  outputs = {self, nixpkgs, utils}:
  let out = system:
  let pkgs = nixpkgs.legacyPackages."${system}";
  in {
    devShell = pkgs.mkShell {
      buildInputs = with pkgs; [
        self.defaultPackage."${system}"
      ];
    };

    defaultPackage = pkgs.python3Packages.buildPythonApplication rec {
      pname = "beets-dynamicrange";
      version = "unstable-2022-08-15";

      src = ./.;

      nativeBuildInputs = [ pkgs.beets ];
      propagatedBuildInputs = [ pkgs.dr14_tmeter ];

      postPatch = ''
        substituteInPlace beetsplug/dynamicrange.py \
          --replace dr14_tmeter ${pkgs.dr14_tmeter}/bin/dr14_tmeter
      '';

      doCheck = false;

      meta = with pkgs.lib; {
        homepage = "https://github.com/auchter/beets-dynamicrange";
        description = "Calculate and store dynamic range of music for beets";
        license = licenses.mit;
        maintainers = with maintainers; [ auchter ];
        platforms = platforms.linux;
      };
    };

    defaultApp = utils.lib.mkApp {
      drv = self.defaultPackage."${system}";
    };
  }; in with utils.lib; eachSystem defaultSystems out;
}