From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Charles C. Berry" <ccberry@ucsd.edu>
Subject: Re: Is it possible to "properly" indent inside latex fragments?
Date: Mon, 23 Jan 2017 08:44:05 -0800
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To: Alain Cochard <Alain.Cochard@unistra.fr>
Cc: emacs-orgmode@gnu.org

On Mon, 23 Jan 2017, Alain.Cochard@unistra.fr wrote:

>
> Hello.
>
> This is what I obtain if I type each line followed by <Enter> and then
> <TAB> in an org file:
>
> * foo
>  \begin{displaymath}
>  \begin{split}
>  a &= b \\
>  &+c
>  \end{split}
>  \end{displaymath}
>
> If I highlight everything and use 'M-x indent-region' or 'M-x
> org-indent-region', it does not change.
>
> Instead, what I would like to get is:
>
> * foo
>  \begin{displaymath}
>    \begin{split}
>      a &= b \\
>      &+c
>    \end{split}
>  \end{displaymath}
>
> (That specific indentation for the latex instructions is what I obtain
> within a .tex file.)
>
> Is it possible?

With export blocks you can get close.

If you type =C-c '= inside the following export block, you will get the 
contents in a latex buffer. Then indentation and other LATEX/P mode 
operations are available. When you exit with another =C-c '= the 
indentation is preserved.

#+BEGIN_EXPORT latex
\begin{displaymath}
   \begin{split}
     a &= b \\
     &+c
   \end{split}
\end{displaymath}
#+END_EXPORT


HTH,

Chuck