From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Charles C. Berry" <ccberry@ucsd.edu>
Subject: Re: How would you export one headline every time that you tangle the
 file?
Date: Wed, 12 Aug 2015 18:34:26 -0700
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To: Grant Rettke <gcr@wisdomandwonder.com>
Cc: "emacs-orgmode@gnu.org" <emacs-orgmode@gnu.org>

On Wed, 12 Aug 2015, Grant Rettke wrote:

> Good afternoon,
>
> I've got an org file. It has a bunch of headlines. There is on
> headline names README.
>
> I want to do something every time I tangle the file. I want to:
>
> - Go to that headline
> - Select set the region to the contents of that headline (org-mark-subtree)
> - Export the contents using the Github Flavored Markup to the file README.md.
>

If this is a one-off, I'd write a babel block like this and put it under 
the headline of that subtree:

#+NAME: tangle-and-export-readme
#+BEGIN_SRC emacs-lisp :tangle no :exports none
(org-babel-tangle)
(require 'ox-gfm)
(org-export-to-file 'gfm "README.md" nil t)
#+END_SRC


Then when you want to tangle,

C-c C-v g tangle-and-export-readme RET C-c C-c y

will do it. (Assuming contrib is on the load path, of course.)

You can use TAB completion with `C-c C-v g'.

HTH,

Chuck