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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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