From: Charles Berry <ccberry@ucsd.edu>
To: emacs-orgmode@gnu.org
Subject: Re: org babel before excute hook
Date: Sat, 12 Oct 2013 02:28:20 +0000 (UTC) [thread overview]
Message-ID: <loom.20131012T040759-761@post.gmane.org> (raw)
In-Reply-To: CAJ51ETpqTsHmeLatSx4bp_vW3+cT+a2QcJgQWbHew1fxcMOwiA@mail.gmail.com
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
[rest deleted]
next prev parent reply other threads:[~2013-10-12 2:28 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-11 13:56 org babel before excute hook Henning Redestig
2013-10-11 20:31 ` John Kitchin
2013-10-12 2:28 ` Charles Berry [this message]
2013-10-12 13:11 ` Henning Redestig
2013-10-13 21:22 ` Henning Redestig
2013-10-13 21:35 ` Samuel Wales
2013-10-14 6:45 ` Henning Redestig
2013-10-14 8:11 ` [babel] Feature request - WAS: " Rainer M Krug
2013-10-14 13:24 ` Eric Schulte
2013-10-26 22:05 ` Samuel Wales
2013-10-14 13:29 ` Eric Schulte
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