[Orgmode] Re: return link to :file when using #+call

[Dan Davison]

Myles English <address@hidden> writes:

> Thanks for your answer Eric.  Recent changes as per
> http://thread.gmane.org/gmane.emacs.orgmode/35396
> means that this no longer works.

Thanks for bringing this up Myles.

> To recap: what I would like to do is to #+call an R source
> block, passing a filename, and have it write a plot to that file and
> also insert a link to that file in the org file.  Any ideas?
>
> Here is what I have tried:
>
> #+source: foo()
> #+begin_src R :file bar.png :results graphics
> plot(1,1)
> #+end_src
>
>
> #+call: foo[:file baz.png]()
>
> #+results: foo[:file baz.png]()
> : baz.png
>
> baz.png contains a plot, but no file link is inserted.

Yes you need :results file, so the line should be

#+call: foo[:file baz.png]() :results file

Explanation: In simple single-block usage, :file automatically
sets :results file. But here :file in square brackets is passed to block
foo, so the #+call line needs its own :results file. (And in fact :file
would be wrong; see below).

>
> #+call: foo()
>
> #+results: foo()
> : bar.png
>
> bar.png contains a plot, but no file link is inserted.

Yep. Same as above, except here you haven't overridden the file name.

> #+call: foo[:file biff.png]() :file biff.png
>
> #+results: foo[:file biff.png]()
> [[file:biff.png]]
>
> a file link is inserted but file biff.png contains 'biff.png'

Right, this one's kind of instructive for understanding this
stuff. Here, foo returns its file name as a string, so
"biff.png". The #+call line has been told to send its results to file
with the :file argument, and it takes that literally, writing the string
"biff.png" to its output file. So if what we want is a file containing
graphics, we are not going to want :file on the #+call line. What we
want is to interpret the string as a file name, and that's what :results
file does.

>
> #+call: foo[:file pow.png]() :file pow.png :results graphics
>
> #+results: foo[:file pow.png]()
> [[file:pow.png]]
>
> a file link is inserted but file pow.png contains 'pow.png'

Same as above. #+call receives a string from foo; it can't turn that
string into the desired graphics. In fact, :results graphics currently
only has any effect on an R block (i.e. at an R block, or passed to an R
block inside [ ... ]).

Dan

>
> Thanks,
>
> Myles
>
>
> On Wed, 05 Jan 2011 23:28:00 -0700
> "Eric Schulte" <address@hidden> wrote:
>
>> Hi Myles,
>> 
>> Currently I believe the best option is the solution you posted below,
>> the file name is repeated because both the code block and the call
>> line need to know the file name to create the file and the link
>> respectively.
>> 
>> Cheers -- Eric
>> 
>> Myles English <address@hidden> writes:
>> 
>> > Myles English <mylesenglish <at> gmail.com> writes:
>> >
>> >> #+source: foo()
>> >> #+begin_src R :file bar.png
>> >> plot(1,1)
>> >> #+end_src
>> >
>> > This works but I have to repeat the filename:
>> >
>> > #+call: foo[:file baz.png]() :file baz.png
>> >
>> > #+results: foo[:file baz.png]()
>> > [[file:baz.png]]
>> >
>> >   Myles
>> >
>> >
>> > _______________________________________________
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>
>
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