Re: [O] org babel before excute hook

[Henning Redestig]

Is it possible to add a function to org-ctrl-c-ctrl-c-hook without patching ob-core.el? If I just add something like

(add-hook 'org-ctrl-c-ctrl-c-hook 'org-babel-stop-if-file-collision)

in my .emacs I notice that my addition gets overwritten later via the autoloads (I think) that are defined in ob-core.el..

2013/10/12 Charles Berry <address@hidden>

John Kitchin <jkitchin <at> andrew.cmu.edu> writes:

>
>
>
> I have a related kind of problem. When preparing notes
> for a class, I may end up with 70 code blocks in an org file, many of
> which create graphics. I am always worried about accidentally using the
> same filename and overwriting a graphic from an earlier block. A unique,
>  but reproducible filename would be sufficient for my needs.
>

Header arg values can be elisp calls. You can use `make-temp-file'.

So every time this block is executed, a new file is created and the
file link is added to the results.

#+BEGIN_SRC R :results output append :file (make-temp-file "temp")
cat(date(),"\n")
#+END_SRC

#+RESULTS:
[[file:/var/folders/kb/2hchpbyj7lb6z76l0q73w_fh0000gn/T/temp302IjV]]
[[file:/var/folders/kb/2hchpbyj7lb6z76l0q73w_fh0000gn/T/temp3028Lu]]

See `temporary-file-directory', too, if you want to use this, as the
default may not be what you intend.


You might want to use this:

#+BEGIN_SRC emacs-lisp
  (defun local-tfile (file)
    (let ((temporary-file-directory "."))
      (make-temp-file file)))
#+END_SRC

Then the files go in the local directory when this is executed:

#+BEGIN_SRC R :file (local-tfile "tfile") :results output append
cat(date(),"\n")
#+END_SRC

You might not want `append' in this case.


HTH,

Chuck

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