From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Charles C. Berry" <ccberry@ucsd.edu>
Subject: Re: remote plot with local output?
Date: Fri, 18 Sep 2015 11:11:33 -0700
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To: Benda Xu <heroxbd@gentoo.org>
Cc: emacs-orgmode@gnu.org

On Fri, 18 Sep 2015, Benda Xu wrote:

> Hi,
>
> Benda Xu <heroxbd@gentoo.org> writes:
>
>> "Charles C. Berry" <ccberry@ucsd.edu> writes:
>>
>>> Untested, but try this :
>>>
>>> #+name: localize
>>> #+BEGIN_SRC emacs-lisp :var file="" srcinfo=(org-babel-get-src-block-info)
>>>    (let* ((dir (cdr (assoc :dir (nth 2 srcinfo))))
>>>           (rfile (concat (file-name-as-directory dir) file))
>>>           (lfile (car (last (split-string rfile ":")))))
>>>      (copy-file rfile lfile 1)
>>>      lfile)
>>> #+END_SRC
>>>
>>> then use
>>>
>>> #+HEADER: :post localize(*this*)
>>>
>>> in your python src block.
>>
>> It successfully extracts the :dir field.  Thanks!
>
> Python works this way.  But babel R has a completely different *this*
> value.  Consider the following example:
>
>  #+BEGIN_SRC R :results output graphics :file line.png :dir /ipmuap02:/tmp
>  plot(c(1,2,3))
>  #+END_SRC
>
>  #+RESULTS:
>  [[file:/scp:ipmuap02:/tmp/line.png]]
>
> *this* equals "[[file:/scp:ipmuap02:/tmp/line.png]]", but in babel
> python *this* equals "line.png".
>
> So I come up with
>
>  #+name: localize
>  #+BEGIN_SRC emacs-lisp :var file="" srcinfo=(org-babel-get-src-block-info)
>    (let ((lang (car srcinfo)))
>      (cond ((string= lang "python")
>             (let* ((dir (cdr (assoc :dir (nth 2 srcinfo))))
>                    (rfile (concat (file-name-as-directory dir) file))
>                    (lfile (car (last (split-string rfile ":")))))
>               (copy-file rfile lfile 1)
>               lfile))
>            ((string= lang "R")
>             (let* ((rfile (substring file 7 -2))
>                    (lfile (car (last (split-string rfile ":")))))
>               (copy-file rfile lfile 1)
>               (concat "[[file:" lfile "]]")))))
>  #+END_SRC
>
> But the result is a string rather than a file link:
>
>  #+HEADER: :post localize(*this*)
>  #+BEGIN_SRC R :results output graphics :file line.png :dir /ipmuap02:/tmp
>  plot(c(1,2,3))
>  #+END_SRC
>
>  #+RESULTS:
>  : [[file:/tmp/line.png]]
>
> Any hints?
>

Forget *this* and use the

 	(cdr (assoc :file (nth 2 srcinfo))

to get the file name.  That should work the same way regardless of 
language.

Chuck