{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-parts = {
      url = "github:hercules-ci/flake-parts";
      inputs.nixpkgs-lib.follows = "nixpkgs";
    };
    systems.url = "github:nix-systems/default";
  };

  outputs = {flake-parts, ...} @ inputs:
    flake-parts.lib.mkFlake {inherit inputs;} {
      systems = import inputs.systems;

      perSystem = {
        pkgs,
        system,
        ...
      }: rec {
        devShells.default = pkgs.mkShell {
          packages = packages.notebooks.buildInputs;
        };

        packages.notebooks = pkgs.stdenvNoCC.mkDerivation {
          name = "notebooks";

          src = ./.;
          dontUnpack = true;
          buildInputs = [
            (pkgs.julia.withPackages [
              "Pluto"
              "Plots"
              "PlutoUI"
              "LinearAlgebra"
              "SparseArrays"
              "LaTeXStrings"
            ])
          ];

          buildPhase = ''
            # copy the notebooks, Pluto needs write permission
            cp $src/TP1/notebook.jl index.jl
            cp $src/TD/notebook.jl exos.jl
            chmod +w index.jl exos.jl

            # julia needs permission to create .julia directory
            export HOME=$TMPDIR

            # run and export the notebooks
            julia $src/export_html.jl exos.jl index.jl
          '';

          installPhase = ''
            mkdir -p $out
            cp index.html $out
            cp exos.html $out
          '';
        };
      };
    };
}