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Re: Allowing closure's in style hooks?

From: Tassilo Horn
Subject: Re: Allowing closure's in style hooks?
Date: Thu, 17 Nov 2022 13:30:13 +0100
User-agent: mu4e 1.9.2; emacs 29.0.50

Arash Esbati <> writes:

Hi Arash,

> I'd like to install this change in `TeX-parse-argument':
> diff --git a/tex.el b/tex.el
> index 7fe8095a..129571ae 100644
> --- a/tex.el
> +++ b/tex.el
> @@ -3554,7 +3554,7 @@ See `TeX-parse-macro' for details."
>               (set-marker TeX-exit-mark (point)))
>             (insert TeX-arg-closing-brace)
>             (setq insert-flag t))
> -          ((symbolp arg)
> +          ((or (symbolp arg) (functionp arg))
>             (funcall arg optional))
>            ((listp arg)
>             (let ((head (car arg))
> With this, we can use things like this:
>   (TeX-add-symbols
>     `("foo" ,(lambda (_) ...)))
> in our styles.  We're already using this in `TeX-read-key-val' et al.,
> so why not also anywhere else?  This could help us getting rid of more
> `TeX-arg-eval' constructs.

Yes, please.

> Any comments welcome.

You can omit the symbolp check or rather replace it with functionp.  If
a symbol has a symbol-function, then (functionp symbol) will return t.
But be sure to have a t-case in the cond which signals an error when no
other clause applies.


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