Fix pipenv nesting issue

init.el

;; ~/.spacemacs.d/init.el
;; ...
;; IMPORTANT: Make sure python-pipenv-activate is nil, or modify the below code.

(defun dotspacemacs/user-config ()
  ;; ...
  ;; fix nested pipenv module problem
  (advice-add 'pipenv--command :around #'mikemacs/my-setup-pipenv-default-directory)
  ;; ...
  )

(defun mikemacs/my-setup-pipenv-default-directory (orig-fun &rest args)
  "Workaround to set default directory before calling pipenv functions.

Needed because pipenv can't handle deeply nested modules."
  (let ((default-directory (or (pipenv-project?) default-directory)))
    (message "Advising pipenv to use directory %S" default-directory)
    (apply orig-fun args)))