Re: [Orgmode] [babel] Painless integration of source blocks with language

[Eric Schulte]

Seth Burleigh <address@hidden> writes:

>>As for how to trace back through noweb links, the best option seem to be
>>using the existing jump function to navigate from raw source to the
>>embedded block, keeping track of the point's offset form the beginning
>>of the block, then using `org-babel-expand-src-block' to expand the body
>>of the embedded code block marking noweb references with text properties
>>as they are inserted into the expanding body, and then using the point
>>offset to place the point into the appropriate noweb reference.  This
>>process could then recurse on the embedded noweb code block until it
>>ends up in a non-noweb portion of an expanded code block body.
>
> If you dont have any comment anchors in the text, how would you know which
>  noweb block you are in? If your org file and raw files are synched, then
> you could, but if they become unsynched, which is the way it should be
> (change raw code until done, then detangle to org), i dont exactly see how
> you can do it.
>

Yea, I think you're right.  I can't come up with any way of marking or
remembering the boundaries of noweb reference sections without inserting
comment wrappers around such sections.

I've just pushed up a new header argument combination ":comments noweb"
which will wrap all embedded noweb sections in link comments, as
demonstrated in the following example.  Hopefully this should be
sufficient for a complete mapping from a pure code file back to the
original org-mode file.

#+source: wrappable
#+begin_src emacs-lisp
  (setq x (+ 4 x))
#+end_src

#+begin_src emacs-lisp :comments noweb :noweb yes :tangle yes
  (let ((x 1))
    (message "x=%s" x)
    <<wrappable>>
    (message "x=%s" x))
#+end_src

which tangles out the following emacs-lisp
#+begin_src emacs-lisp
  ;; 
[[file:~/src/babel-dev/scraps.org::*wrap%20noweb%20references%20in%20comments][wrap-noweb-references-in-comments:2]]
  (let ((x 1))
    (message "x=%s" x)
    ;; 
[[file:~/src/babel-dev/scraps.org::*wrap%20noweb%20references%20in%20comments][wrappable]]
    (setq x (+ 4 x))
    ;; wrappable ends here
    (message "x=%s" x))
  ;; wrap-noweb-references-in-comments:2 ends here
#+end_src

Cheers -- Eric