blog/flake.nix

{
  description = "Kristian's Website";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    nostyleplease = {
      url = "github:Masellum/hugo-theme-nostyleplease";
      flake = false;
    };
  };

  outputs = {
    self,
    nixpkgs,
    nostyleplease,
  }: let
    supportedSystems = ["x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin"];
    forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
    pkgs = forAllSystems (system: nixpkgs.legacyPackages.${system});
  in {
    formatter = forAllSystems (system: pkgs.${system}.alejandra);

    packages = forAllSystems (system: {
      default = pkgs.${system}.stdenv.mkDerivation {
        name = "blog";

        # Exclude themes and public folder from build sources
        src = builtins.filterSource (path: type: !(type == "directory" && (baseNameOf path == "themes" || baseNameOf path == "public"))) ./.;

        nativeBuildInputs = with pkgs.${system}; [
          hugo
        ];

        # Link theme to themes folder and build
        buildPhase = ''
          mkdir -p themes
          ln -s ${nostyleplease} themes/nostyleplease
          hugo --gc --minify
        '';

        installPhase = ''
          cp -r public/. $out
        '';
      };
    });

    devShells = forAllSystems (system: {
      default = pkgs.${system}.mkShellNoCC {
        packages = with pkgs.${system}; [
          hugo
        ];

        # Link theme to themes folder
        shellHook = ''
          if [ ! -d ./themes ]; then
            mkdir ./themes
          fi

          if [ ! -d ./themes/nostyleplease ]; then
            ln -s ${nostyleplease} ./themes/nostyleplease
          fi

          alias new='hugo new content'
          alias serve='hugo serve --buildDrafts'

          greeter_text="
            * Create new content with:
              new posts/name-of-post.md

            * Render drafts with:
              serve
          "

          echo "$greeter_text"
        '';
      };
    });
  };
}