What does ! in use-package or package?
reddit / emacs

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wWA5RnA4n2P3w2WvfHq · 2022-04-28 11:35

Please see this peace of code ((from
here)[https://github.com/ThomasFKJorna/org-roam-timestamps/#doom-
emacs]) where a "periode" (`!`) is used after `package!` and `use-
package!`.

```
;;packages.el
(package! org-roam-timestamps)

(use-package! org-roam-timestamps
  :after org-roam
  :config (org-roam-timestamps-mode))
```

I have never seen this before. What is this for?

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whudwl · 2022-04-28 11:43

It's a macro.  Macro name is `use-package!`. `!` can be used in
function /macro names.  see here https://github.com/hlissner/doom-
emacs/blob/6bf725837def83acd140d9431d799c8b09abebf3/core/core-
modules.el#L489

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JohnathanDee · 2022-04-28 15:16

Is a doom macro yah? Are you using Doom Emacs or GNU?

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XCapitan_1 · 2022-04-28 18:31

`!` is just a symbol that you can have in a name. Lisp is less
restrictive about identifier names, for instance `/` is also allowed
and commonly used.

Using `!` is a Doom emacs convention, they have a bunch of macros like
`require!` and `!` at the end is just a reminder that it's a Doom
thing and not Emacs built-in. Or correct me if I'm wrong, I don't
actually use Doom.

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wWA5RnA4n2P3w2WvfHq · 2022-04-29 10:01

I use Emacs from the official Debian repository. I don't know what the
difference is and why there is an Emacs version named after an old but
iconic game. ;)

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JohnathanDee · 2022-04-29 10:05

Gotcha, then that is not Doom Emacs, and you shouldn't use that
snippet as-is.

Doom is a "distro" of Emacs, preconfigured for new users and users
coming from Vim background (uses vim keybindings by default).

I can't be much more help than that... I have never used Doom, though
I do use doom themes which can be separately installed