homepage/flake.nix

{
  description = "Fizz.buzz homepage";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    natter = {
      url = "git+https://code.fizz.buzz/talexander/natter.git";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    organic_ast_explorer = {
      url = "git+https://code.fizz.buzz/talexander/organic_ast_explorer.git";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs =
    {
      self,
      nixpkgs,
      natter,
      organic_ast_explorer,
    }:
    let
      forAllSystems =
        func:
        builtins.listToAttrs (
          map (system: {
            name = system;
            value = func system;
          }) nixpkgs.lib.systems.flakeExposed
        );
    in
    {
      devShells = forAllSystems (
        system:
        let
          overlays = [
            natter.overlays.default
            organic_ast_explorer.overlays.default
          ];
          pkgs = import nixpkgs {
            inherit system overlays;
          };
        in
        {
          default = pkgs.mkShell {
            nativeBuildInputs = [
            ];
            buildInputs = with pkgs; [
              pkgs.natter.release
            ];
          };
        }
      );
      packages = forAllSystems (
        system:
        let
          overlays = [
            natter.overlays.default
            organic_ast_explorer.overlays.default
          ];
          pkgs = import nixpkgs {
            inherit system overlays;
          };
          appliedOverlay = self.overlays.default pkgs pkgs;
        in
        rec {
          default = release;
          inherit (appliedOverlay.homepage)
            release
            ;
          docker_env = pkgs.buildEnv {
            name = "homepage";
            paths = with pkgs; [
              appliedOverlay.homepage.launch_nginx
              bash
              uutils-coreutils-noprefix
              # toybox # Smaller than uutils-coreutils?
            ];
          };
        }
      );
      overlays.default = final: prev: {
        homepage = final.lib.makeScope final.newScope (
          homepageScope:
          let
            natter' = (natter.overlays.default final final).natter.release;
            organic_ast_explorer' =
              (organic_ast_explorer.overlays.default final final).organic_ast_explorer.release;
            release = homepageScope.callPackage ./nix/package.nix {
              natter = natter';
              organic_ast_explorer = organic_ast_explorer';
            };
            nginx_conf = final.replaceVars "${./docker/server/nginx.conf}" {
              web_root = release;
              mime_types = "${final.nginx}/conf/mime.types";
              headers_include = "${./docker/server/headers.include}";
            };
            launch_nginx = final.writeShellScriptBin "launch_nginx" ''
              ${final.nginx}/bin/nginx -c ${nginx_conf} -e stderr -g "daemon off;"
            '';
          in
          {
            inherit release launch_nginx;
          }
        );
      };
    };
}