How about ":comments link" header arg? https://org-babel.readthedocs.io/en/latest/header-args/#comments
-k. On 2016-05-03 at 17:33, Ethan Ligon <li...@berkeley.edu> wrote: > When one exports from org to, say, latex the resulting *.tex file > includes a comment at the top indicating the time of creation. This is > useful in part because it lets the user know that the *.tex file isn't > the original source. > > The same isn't true of tangled code from a source block, and I've been > repeatedly bitten by editing a file of python code that was tangled from a > source org file. > > I'd like to deal with this by making tangle emit a comment with > information about the org-source file. The :prologue header argument is > well suited to this; e.g., > > #+begin_src python :tangle /tmp/test.py :prologue (format "# Tangled from > %s on %s" (buffer-file-name) (current-time-string)) > print "Hello, world!" > #+end_src > > produces what one would want. > > I'd like to make this header argument be applied automatically. The > variable org-babel-default-header-args looks like just the ticket, but my > lame efforts to write the necessary emacs-lisp aren't working: > > #+BEGIN_SRC emacs-lisp > (add-to-list 'org-babel-default-header-args:python > '((:prologue . (format "# Tangled from %s on %s" (buffer- > file-name) (current-time-string))))) > #+END_SRC > > What am I doing wrong? > > Thanks for any help, > -Ethan
