#+Title: Proposed =post= Header Argument
#+Author: Eric Schulte

* a code block which does the post processing
This code block adds latex width attributes to whatever =data= is
passed to it.
#+name: add-attr
#+begin_src sh :var data="" :results output drawer :var width="\textwidth"
  echo "#+attr_latex: width=$width"
  echo "$data"
#+end_src

* two code blocks which use the post processing
The following two code blocks demonstrate the use of the new =post=
header argument, whcih we could add if it seems generally useful and
not too confusing.

This works by lexically binding the =*this*= variable to the results
of the current code block, and then calling the =add-attr= code block
to post-process these results.

#+begin_src sh :results output wrap :post add-attr(width="5cm",data=(identity *this*))
cat <<EOF
| 1 | 2 |
| 3 | 4 |
EOF
#+end_src

#+RESULTS:
:RESULTS:
#+attr_latex: width=5cm
| 1 | 2 |
| 3 | 4 |
:END:

This code block does the same thing as the previous one, but using
different values and arguments.

#+header: :post add-attr(width="0.5\\textwidth",data=(identity *this*))
#+begin_src sh :results output wrap
cat <<EOF
| 5 | 6 |
| 7 | 8 |
EOF
#+end_src

#+RESULTS:
:RESULTS:
#+attr_latex: width=0.5\textwidth
| 5 | 6 |
| 7 | 8 |
:END:

* another unrelated example
Say we only care about the size of our results, then we could use the
following.
#+name: wc
#+begin_src sh data=""
  echo "$data"|wc
#+end_src

This code block checks the size of some Emacs Lisp data (in this case
my =load-path= variable).
#+begin_src emacs-lisp :post wc(data=(identity *this*))
  load-path
#+end_src

#+RESULTS:
: 160     160    6783