lab/tailwindcss/flake.nix

{
  inputs = {
    devshell.inputs.nixpkgs.follows = "nixpkgs";
    devshell.url = "github:numtide/devshell";

    flake-parts.url = "github:hercules-ci/flake-parts";

    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
  };

  outputs =
    inputs:
    inputs.flake-parts.lib.mkFlake { inherit inputs; } {
      systems = [ "x86_64-linux" ];

      imports = [ inputs.devshell.flakeModule ];

      perSystem =
        { pkgs, ... }:
        {
          devshells.default = {
            packages = [
              (pkgs.writeShellApplication {
                name = "serve";

                runtimeInputs = with pkgs; [
                  simple-http-server
                  tailwindcss_4
                  watchman
                ];

                text = ''
                  set -o monitor

                  simple-http-server --index --nocache "$@" &
                  PID_SERVER=$!

                  tailwindcss --output tailwind.css --watch &
                  PID_TAILWIND=$!

                  cleanup() {
                    echo "Stopping processes..."

                    kill "$PID_SERVER" "$PID_TAILWIND" 2>/dev/null || true
                    wait "$PID_SERVER" "$PID_TAILWIND" 2>/dev/null || true
                  }
                  trap cleanup EXIT

                  wait
                '';
              })
            ];
          };
        };
    };
}