Emacs Lisp : How to add a folder and all its first level sub-folders to the load-path

Question

如果我有一个这样设置的文件夹结构:

~/Projects
    emacs
        package1
            package1-helpers
        package2
            package2-helpers
            package2-more-helpers
        package3
            package3-helpers

如何添加这些文件夹:

~/项目/emacs

~/Projects/emacs/package1

~/Projects/emacs/package2

~/Projects/emacs/package3

...到 load-path从我的 .emacs 文件？

我基本上需要此代码的简短自动版本:

(add-to-list 'load-path "~/Projects/emacs")
(add-to-list 'load-path "~/Projects/emacs/package1")
(add-to-list 'load-path "~/Projects/emacs/package2")
(add-to-list 'load-path "~/Projects/emacs/package3")

Answer 1

(let ((base "~/Projects/emacs"))
  (add-to-list 'load-path base)
  (dolist (f (directory-files base))
    (let ((name (concat base "/" f)))
      (when (and (file-directory-p name) 
                 (not (equal f ".."))
                 (not (equal f ".")))
        (add-to-list 'load-path name)))))