Emacs：变量的符号值为void [英] Emacs: Symbol's value as variable is void

问题描述

这是我的〜/ .emacs 文件：

(setq-default c-basic-offset 4 c-default-style "linux")
(setq-default tab-width 4 indent-tabs-mode t)
(define-key c-mode-base-map (kbd "RET") 'newline-and-indent)

我正在收到警告当我打开emacs时：

I'm getting a warning when I open up emacs:

警告（初始化）：加载
时发生错误c： /home/.emacs ：

符号作为变量的值为void： c-mode-base-map

Symbol's value as variable is void: c-mode-base-map

为确保正常运行，您应调查并删除
导致的初始化文件中的错误。启动Emacs与
- debug-init 选项查看完整的错误回溯。

To ensure normal operations, you should investigate and remove the cause of the error in your initialization file. Start Emacs with the --debug-init option to view a complete error backtrace.

我运行 - debug-init ，这是它返回的。我不知道我的意思：

I ran --debug-init and this is what it returned. I don't know what I means:

调试器输入 - Lisp错误：（void-variable c-模式基地图）

(define-key c-mode-base-map (kbd "RET") (quote newline-and-indent)) 

eval-buffer(#<buffer *load*> nil "c:/home/.emacs" nil t)

; Reading at buffer position 311
load-with-code-conversion("c:/home/.emacs" "c:/home/.emacs" t t)

load("~/.emacs" t t)

推荐答案

p>这意味着，在您调用 define-key 的位置， c-mode-base-map 还没有被任何东西定义。

What this means is that, at the point at which you invoke define-key, c-mode-base-map is not yet defined by anything.

通常的修复是找出这个定义的位置，并要求该模块。在这种情况下：

The usual fix is to find out where this is defined and require that module. In this case:

(require 'cc-mode)

但是还有其他可能的修复，例如在模式挂钩中设置键绑定，或使用 eval-after-load 。你使用哪一个取决于你我倾向于做KISS方法，因为我一般不关心启动时间;但如果你这样做，你可能想要一些更懒惰的东西。

However there are other possible fixes as well, for example setting the key-binding in a mode hook, or using eval-after-load. Which one you use is up to you; I tend to do the KISS approach since I don't generally care about startup time; but if you do you may want something lazier.

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