homepage/flake.nix

{
  description = "Angestöpselt Homepage";

  inputs.nixpkgs.url = "nixpkgs/nixos-unstable";

  outputs = { self, nixpkgs }: let
    system = "x86_64-linux";

    pkgs = import nixpkgs { inherit system; };

    nodejs = pkgs.nodejs-16_x;

    nodePackages = import ./_nix/default.nix { inherit pkgs system nodejs; };
    nodeDependencies = nodePackages.nodeDependencies.override {
      nativeBuildInputs = with pkgs; [ pkg-config ];
      buildInputs = with pkgs; [ vips ];
      dontNpmInstall = true;
    };
  in {
    # This package isn't actually the fully-built site, but rather a derivation
    # that contains the relevant programs (with correctly set up environment)
    # to develop and build the site. It can either be used with `nix develop` –
    # see the repository's readme for details – or compiled with `nix build`.
    # The latter will output a folder which contains node and npm binaries that
    # can be used in an IDE.
    packages.${system}.angestoepselt-site-dev = pkgs.runCommand "angestoepselt-site-dev" {
      buildInputs = [ nodejs pkgs.makeWrapper ];

      shellHook = ''
        export NODE_PATH=${nodeDependencies}/lib/node_modules
        export PATH="${nodeDependencies}/bin:$PATH"

        echo ""
        echo "  To start editing content, run:"
        echo ""
        echo "npm run build:styles"
        echo "npm run dev:site"
        echo ""
        echo "  The site will be available under http://localhost:8080/ for"
        echo "  local development and rebuilds automatically when content"
        echo "  changes."
        echo ""
      '';
    } ''
      mkdir -p "$out"

      wrap() {
        makeWrapper "${nodejs}/bin/$1" "$out/bin/$1" \
          --prefix PATH : "${nodejs}/bin" \
          --prefix PATH : "${nodeDependencies}/bin" \
          --set-default NODE_PATH "${nodeDependencies}/lib/node_modules"
      }

      wrap node
      wrap npm
      wrap npx

      unset -f wrap
    '';

    defaultPackage.${system} = self.packages.${system}.angestoepselt-site;
  };
}