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Re: [AUCTeX-devel] Don't fold braces and brackets in math mode

From: Tassilo Horn
Subject: Re: [AUCTeX-devel] Don't fold braces and brackets in math mode
Date: Mon, 09 Mar 2015 09:31:56 +0100
User-agent: Gnus/5.130012 (Ma Gnus v0.12) Emacs/25.0.50 (gnu/linux)

Mosè Giordano <address@hidden> writes:

> consider the following math environment:
> \begin{equation}
>   \alpha[b]{c}
> \end{equation}
> It's folded to
> \begin{equation}
>   α
> \end{equation}
> because the square brackets and braces are interpreted by AUCTeX as
> arguments to the `\alpha' macro, but most of the commands to be folded
> in math modes (e.g. greek letters) don't take arguments and square
> brackets are often used as they are.

There are also some exceptions to this rule, e.g., \sqrt[3]{x} which is
the third root of x.

> The attached patch fixes this issue by ignoring square brackets and
> curly braces in math mode.  Comments welcome.

I don't have a strong opinion here as I don't use folding (or only
folding in the sense of `outline-minor-mode').  But it looks like hard
to get right in every situation, i.e., with your patch your example
above would work whereas \sqrt[3]{x} which now folds correctly to [sqrt]
would fold to [sqrt][3]{x}, that is, its arguments wouldn't be folded

Maybe you could treat whitespace as macro end in math mode?  E.g.,
"\alpha [b] {c}" is treated as three separate items as you expect
whereas "\alpha[b]{c}" is just one item.


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