Emacs:符号作为变量的值是无效的 [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)

当我打开 emacs 时收到警告:

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:

Warning (initialization): An error occurred while loading c:/home/.emacs:

Symbol 作为变量的值是无效的:c-mode-base-map

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

为确保正常运行，您应该调查并删除初始化文件中错误的原因.使用以下命令启动 Emacs--debug-init 选项以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.

我运行了 --debug-init，这就是它返回的内容.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:

调试器进入--Lisp错误:(void-variable c-mode-base-map)

Debugger entered--Lisp error: (void-variable c-mode-base-map)

(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

这意味着，在您调用 define-key 时，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.

通常的解决方法是找出它的定义位置并需要该模块.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)

然而，还有其他可能的修复方法，例如在模式挂钩中设置键绑定，或使用 eval-after-load.您使用哪一种取决于您；我倾向于采用 KISS 方法，因为我通常不关心启动时间；但如果你这样做，你可能想要更懒惰的东西.

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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