dream2nix/src/fetchers/npm/default.nix

{
  fetchurl,
  lib,
  python3,

  utils,
  ...
}:

let
  b = builtins;
in

rec {
  inputs = [ "pname" "version" ];

  versionField = "version";

  # becuase some node packages contain submodules like `@hhhtj/draw.io`
  # the amount of arguments can vary and a custom parser is needed
  parseParams = params:
    if b.length params == b.length inputs then
      lib.listToAttrs
        (lib.forEach
          (lib.range 0 ((lib.length inputs) - 1))
          (idx:
            lib.nameValuePair
              (lib.elemAt inputs idx)
              (lib.elemAt params idx)
          ))
      else if b.length params == (b.length inputs) + 1 then
        parseParams [
          "${b.elemAt params 0}/${b.elemAt params 1}"
          (b.elemAt params 2)
        ]
      else
        throw ''
          Wrong number of arguments provided in shortcut for fetcher 'npm'
          Should be npm:${lib.concatStringsSep "/" inputs}
        '';


  # defaultUpdater = "";

  outputs = { pname, version, }@inp:
    let
      b = builtins;

      submodule = lib.last (lib.splitString "/" pname);
      url = "https://registry.npmjs.org/${pname}/-/${submodule}-${version}.tgz";
    in
    {

      calcHash = algo: utils.hashPath algo (
        b.fetchurl { inherit url; }
      );

      fetched = hash:
        let
          source =
            (fetchurl {
              inherit url;
              sha256 = hash;
            }).overrideAttrs (old: {
              outputHashMode = "recursive";
            });
        in
          utils.extractSource {
            inherit source;
          };

    };
}