From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Charles C. Berry" <ccberry@ucsd.edu>
Subject: Re: Tabs in export of code
Date: Sun, 11 Jan 2015 18:05:36 -0800
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To: Giuseppe Lipari <giulipari@gmail.com>
Cc: emacs-orgmode@gnu.org

On Sun, 11 Jan 2015, Giuseppe Lipari wrote:

> Dear all,
>
> I am preparing a set of slides with examples of java code. I am using the
> beamer exporter, configured for using minted with the following options:
>

[snip]
>
>
> Ok, now the problem.I want to export a slide with this snippet:
>
>
> #+BEGIN_SRC java
>  class PrimeThread extends Thread {
>      long minPrime;
>      PrimeThread(long minPrime) {
>          this.minPrime = minPrime;
>      }
>
>      public void run() {
>          // compute primes larger than minPrime
>          ...
>      }
>  }
>  ...
>  PrimeThread p = new PrimeThread(143);
>  p.start();
> #+END_SRC
>
> There is not tab in this snipper (I never use tabs in code, only spaces).
> Unfortunately, when opening the tex file, I see that a tab has been
> introduced whenever 8 consecutive spaces are found, in particular at line 4.
>

This happens deep down (in org-indent-line-to, I guess) and AFAICS you do 
not have an option to set to change this.

But you can use a filter function to change the TABs to spaces. This 
seems to handle your case:

#+BEGIN_SRC emacs-lisp
   (add-to-list 'org-export-filter-final-output-functions
                (lambda (x y z)
                  (replace-regexp-in-string "\t" "        " x nil t)))
#+END_SRC

If you want to only do this for src blocks, then use 
`org-export-filter-src-block-functions' instead.


See

 	(info "(org) Advanced configuration")

under `Filters' for details.

HTH,

Chuck