See the code below:

#+NAME: ansi-escape-filter
#+begin_src emacs-lisp :var data=""
(with-temp-buffer
  (insert data)
  (ansi-color-apply-on-region (point-min) (point-max))
  (buffer-string))
#+end_src

#+RESULTS: ansi-escape-filter

#+begin_src sh :dir /sudo::  :results output :post  ansi-escape-filter(data=*this*)
tree /var/spool/postfix/
#+end_src

`:results output` is needed to avoid parsing the shell output as a
table.
`data=*this*` is needed to pass the output to `ansi-escape-filter`. You
can also check the example in the org info page for the :post header
argument.


Best,
Ihor

stardiviner <numbchild@gmail.com> writes:

> I want to processing the shell ANSI escaping characters correctly or
> just filter them out for display result correctly in Emacs.
>
> Here is my try:
>
> #+NAME: ansi-escape-filter
> #+begin_src emacs-lisp
> (ansi-color-apply-on-region (point-min) (point-max))
> #+end_src
>
> #+begin_src sh :dir /sudo:: :post ansi-escape-filter
> sudo tree /var/spool/postfix/
> #+end_src
>
> #+RESULTS[<2019-01-19 10:58:39> f6d16244322abbd4fbe01bfaa084ac6bdd66a62c]:
> : nil
>
> The second source block's result is supposed to be result of command
> =sudo tree /var/spool/postfix/= instead of =nil=.
>
> Can someone help me how to do this correctly?
>
> -- 
> [ stardiviner ]
>        I try to make every word tell the meaning what I want to express.
>
>        Blog: https://stardiviner.github.io/
>        IRC(freenode): stardiviner, Matrix: stardiviner
>        GPG: F09F650D7D674819892591401B5DF1C95AE89AC3
>       
>