On Wed, 21 Sep 2016, Philip Hudson wrote:

AFAICT :tangle takes only "yes", "no", or a literal pathname.


Stuff like

   :tangle (my-lisp-function arg1 arg2)

will work.

How
might I dynamically generate a pathname for :tangle? I suppose what I
want is some kind of escape syntax for eval'ing a Lisp form, like
maybe:

   :tangle %(my-dynamic-filename-generator)

Try this:

#+BEGIN_SRC R :tangle (concat "my-" "file" ".R")
abs <- def
#+END_SRC

just as an example.

BTW, org-babel-view-src-block-info (C-c C-v C-i) will show you what header args evaluate as without the need to eval or tangle them.

HTH,

Chuck

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