my-pkgs/pkgs/default.nix

{ pkgs }:
let
  self = {
    example-a = pkgs.callPackage ./example-a { };
    example-b = pkgs.callPackage ./example-b { };
    pyzotero = pkgs.callPackage ./pyzotero { };
    pyzotero-cli = pkgs.callPackage ./pyzotero-cli {
      pyzotero = self.pyzotero;
    };
    khal-export = pkgs.callPackage ./khal-export { };
    org-zotero-export = pkgs.callPackage ./org-zotero-export { };
  };
in
self // { default = self.example-a; }