emacs23/elisp:如何正确自动加载这个库? [英] emacs23 / elisp: how to properly autoload this library?

问题描述

我正在升级到 emacs23.我发现我的 emacs.el 加载速度要慢得多.

I am upgrading to emacs23. I find that my emacs.el loads much more slowly.

这真的是我自己的错...我里面有很多东西.

It's my own fault really... I have a lot of stuff in there.

所以我也试图自动加载我的 emacs.el 当前需要"的所有可能的东西.

So I am also trying to autoload everything possible that is currently "required" by my emacs.el.

我有一个公开 12 个入口点的模块 - 我可以调用的交互函数.

I have a module that exposes 12 entry points - interactive functions I can call.

对 autoload 进行 12 次调用以确保无论我调用哪个函数都加载模块是正确的方法吗?这种方法有什么问题吗?它会出现性能问题吗?

Is the correct approach to have 12 calls to autoload in order to insure that the module is loaded regardless of which function I call? Are there any problems with this approach? Will it present performance issues?

如果不是那种方法，那又怎样?

If not that approach, then what?

推荐答案

您真正想要的是自动为您生成自动加载，以便您的 .emacs 文件保持原始状态.大多数包中已经包含 ;;;###autoload 行，如果没有，您可以轻松添加它们.

What you really want is to get the autoloads generated for you automatically, so that your .emacs file remains pristine. Most packages have the ;;;###autoload lines in them already, and if not, you can easily add them.

为了管理这个，你可以把所有的包放在一个目录中，比如~/emacs/lisp，在那里有一个名为update-auto-loads.el的文件代码>，其中包含:

To manage this, you can put all the packages in a directory, say ~/emacs/lisp, and in there have a file named update-auto-loads.el which contains:

;; put this path into the load-path automatically
;;;###autoload
(progn
  (setq load-path (cons (file-name-directory load-file-name) load-path)))

;;;###autoload
(defun update-autoloads-in-package-area (&optional file)
  "Update autoloads for files in the diretory containing this file."
  (interactive)
  (let ((base (file-truename
       (file-name-directory
        (symbol-file 'update-autoloads-in-package-area 'defun)))))
(require 'autoload)         ;ironic, i know
(let ((generated-autoload-file (concat base "loaddefs.el")))
  (when (not (file-exists-p generated-autoload-file))
    (with-current-buffer (find-file-noselect generated-autoload-file)
      (insert ";;") ;; create the file with non-zero size to appease autoload
      (save-buffer)))
  (cd base)
  (if file
      (update-file-autoloads file)
    (update-autoloads-from-directories base)))))

;;;###autoload
(defun update-autoloads-for-file-in-package-area (file)
  (interactive "f")
  (update-autoloads-in-package-area file))

如果您将 'update-autoloads-in-package-area 添加到您的 kill-emacs-hook，则 loaddefs.el每次退出 Emacs 时都会自动更新.

If you add 'update-autoloads-in-package-area to your kill-emacs-hook, then the loaddefs.el will automatically be updated every time you exit Emacs.

并且，为了将它们联系在一起，将其添加到您的 .emacs 中:

And, to tie it all together, add this to your .emacs:

(load-file "~/emacs/lisp/loaddefs.el")

现在，当你下载一个新的包时，只需将它保存在 ~/emacs/lisp 目录中，通过 Mx update-autoloads-in-package-area(或退出 emacs)，下次运行 Emacs 时它就可用了.无需再更改 .emacs 以加载内容.

Now, when you download a new package, just save it in the ~/emacs/lisp directory, update the loaddefs via M-x update-autoloads-in-package-area (or exit emacs), and it'll be available the next time you run Emacs. No more changes to your .emacs to load things.

有关加速 Emacs 启动的其他替代方案，请参阅此问题:如何我可以让 Emacs 启动得更快吗?

See this question for other alternatives to speeding up Emacs startup: How can I make Emacs start-up faster?

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