let
  lock = builtins.fromJSON (builtins.readFile ./flake.lock);
  fetchTree = import ./nix/fetchTree.nix;
  flakeSources = builtins.mapAttrs (_: node: fetchTree node.locked) lock.nodes;
in
{
  pkgs ? import sources.nixpkgs {
    inherit system;
    config = { };
    overlays = [ ];
  },
  system ? builtins.currentSystem,
  sources ? flakeSources,
  formatter ? pkgs.nixfmt-rfc-style,
}:
pkgs.mkShellNoCC {
  packages = [
    pkgs.zola

    # linters + formatters
    formatter
    pkgs.actionlint
    pkgs.nodePackages.alex
    pkgs.nodePackages.prettier
  ];
}