如何在Emacs Lisp中切换命令？

发布于 2025-01-28 16:07:54 字数 392 浏览 3 评论 0原文

我想拥有一个可以切换Emacs中线号的快捷方式。

这就是我到目前为止的：

(defun my-toggle-display-line-numbers-mode-function ()
"Toggles the line numbers"
  (interactive)
  (display-line-numbers-mode)
  )
(global-set-key [(f7)] 'my-toggle-display-line-numbers-mode-function)

但是它只会打开行号。我无法将其关闭，与我使用MX Display-line-numbers-Mode不同，它将打开或关闭毫无问题。

知道如何改进我的脚本以便按预期运行吗？

原文

I would like to have a shortcut that would toggle the showing of line numbers in Emacs.

This is what I have so far:

(defun my-toggle-display-line-numbers-mode-function ()
"Toggles the line numbers"
  (interactive)
  (display-line-numbers-mode)
  )
(global-set-key [(f7)] 'my-toggle-display-line-numbers-mode-function)

But it will only turn on the line numbers. I can't turn it off, unlike when I use M-x display-line-numbers-mode which will turn on or off without any problem.

Any idea how to improve my script so it works as intended?

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猫卆 2025-02-04 16:07:54

描述功能（ch f）在display-line-numbers-mode给出以下内容：

Signature:
(display-line-numbers-mode &optional ARG)

Documentation:
[...]
This is a minor mode.  If called interactively, toggle the
Display-Line-Numbers mode mode. [...]

If called from Lisp, toggle the mode if ARG is toggle.  Enable
the mode if ARG is nil, omitted, or is a positive number.
Disable the mode if ARG is a negative number.

这是由定义少模式宏，对于大多数次要模式，先前的文档将完全相同。

我们从中得到的：

当互动称为命令时，使用例如mx display-line-numbers-mode），这是一个切换。
当从 elisp源代码调用时，您需要指定一个参数。

如果您希望它充当切换，请在代码中使用（display-line-numbers-mode'toggle）。如果您想要比简单切换更先进的东西（例如，检查一些额外的条件），请使用1和-1作为参数分别启用和禁用模式（顺便说一句，尽管文档不清楚，但0算作负面了模式。

Number shere ，so （display-line-numbers-mode 0）禁用知道。

describe-function (C-h f) on display-line-numbers-mode gives the following:

Signature:
(display-line-numbers-mode &optional ARG)

Documentation:
[...]
This is a minor mode.  If called interactively, toggle the
Display-Line-Numbers mode mode. [...]

If called from Lisp, toggle the mode if ARG is toggle.  Enable
the mode if ARG is nil, omitted, or is a positive number.
Disable the mode if ARG is a negative number.

This is the automatic desciption produced by the define-minor-mode macro, and for most minor modes, the previous documentation will be exactly the same.

What we get from this:

When called interactively (i.e. as a command, using for example M-x display-line-numbers-mode) this acts as a toggle.
When called from Elisp source code, you need to specify an argument.

If you want it to act as a toggle, use (display-line-numbers-mode 'toggle) in your code. If you want something slightly more advanced than a simple toggle (for example, checking some extra conditions), use 1 and -1 as arguments to respectively enable and disable the mode (incidentally, and although the documentation is unclear, 0 counts as a negative number here, and so (display-line-numbers-mode 0) disables the mode.

As it is often the case, Emacs built-in documentation shows all there is to know. Try to get familiar with the help system, it's really good compared to a lot of softwares.

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