如何在Emacs中使用“package-install”(Elpa)安装包？

Question

我已经在Emacs中使用elpa安装了一些包，但是在启动Emacs时如何加载它们呢？

Answer 1

package-install是package.el的一部分，您可以在describe-function中看到这一点。来自package.el文档：

;; At activation time we will set up the load-path and the info path,
;; and we will load the package's autoloads.  If a package's
;; dependencies are not available, we will not activate that package.

所以在每个包中都有一个文件

NAME-autoloads.el

此文件在启动时加载。

整个包都包含在package-user-dir下

(setq package-user-dir "~/.emacs.d/site-lisp/package-install")
(require 'package)

每个包还包含带有包版本和描述的NAME-pkg.el。例如，以下是与tabbar包相关的文件：

​

package-install             # that's my package-user-dir
└── tabbar-2.0.1            # each package dir is in the separate dir
    ├── tabbar-autoloads.el # this file is loaded at start up
    ├── tabbar.el           # the package itself. In this case it is just a single file
    └── tabbar-pkg.el       # information about the package for package managment

引用手册的话：39.1.1 Summary: Sequence of Actions at Startup

Emacs package -enable-at-

1. If是非空的，它调用package-initialize函数来激活任何可选的installed.

过的Emacs Lisp包

然后，package-initialize调用package-activate，后者调用package-activate-1，后者以加载NAME-autoload.el结束

(load (expand-file-name (concat name "-autoloads") pkg-dir) nil t)