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{
  description = "web frontend for git";

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

  outputs =
    { self, nixpkgs }:
    let
      supportedSystems = [
        "x86_64-linux"
        "x86_64-darwin"
        "aarch64-linux"
        "aarch64-darwin"
      ];
      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
      nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; });
    in
    {
      packages = forAllSystems (
        system:
        let
          pkgs = nixpkgsFor.${system};
          legit = self.packages.${system}.legit;
          files = pkgs.lib.fileset.toSource {
            root = ./.;
            fileset = pkgs.lib.fileset.unions [
              ./config.yaml
              ./static
              ./templates
            ];
          };
        in
        {
          legit = pkgs.buildGoModule {
            name = "legit";
            rev = "master";
            src = ./.;

            vendorHash = "sha256-GR+ddG6058s9NDGwbk2z86vcOIa11DUQqP6tS0ruUdo=";
          };
          docker = pkgs.dockerTools.buildLayeredImage {
            name = "sini:5000/legit";
            tag = "latest";
            contents = [
              files
              legit
              pkgs.git
            ];
            config = {
              Entrypoint = [ "${legit}/bin/legit" ];
              ExposedPorts = {
                "5555/tcp" = { };
              };
            };
          };
        }
      );

      formatter = forAllSystems (
        system:
        let
          pkgs = nixpkgsFor.${system};
        in
        pkgs.buildFHSEnv {
          name = "fhs-dprint";
          targetPkgs =
            pkgs: with pkgs; [
              # Formatter frontend.
              # https://dprint.dev/
              dprint

              # > Official formatter for Nix code
              # https://github.com/NixOS/nixfmt
              nixfmt

              # For "gofmt" command.
              go
            ];
          runScript = "dprint fmt";
        }
      );

      defaultPackage = forAllSystems (system: self.packages.${system}.legit);
      devShells = forAllSystems (
        system:
        let
          pkgs = nixpkgsFor.${system};
        in
        {
          default = pkgs.mkShell {
            nativeBuildInputs = with pkgs; [
              go
              gopls
            ];
          };
        }
      );
    };
}