With this change, if :file <filepath> is specified, ruby and python
blindly output a link to <filepath>. Responsibility for creating the
contents in <filepath> lies with the python/ruby code.
One half of this patch is a revert of c167a4ac32.
These changes are necessary so that :results output works correctly
with #+lob calls. For example the following example did not work:
--------------------------------------------------
3. :results output org -> doesn't work with #+lob:
--------------------------------------------------
\#+srcname: randthree(n,max)
\#+begin_src ruby
number = n
maximum = max
puts "* Random numbers\n" +
"Here are some random numbers: " +
(1..number).collect {|x| (rand * maximum).ceil }.join(", ") +
"."
\#+end_src
\#+lob: randthree(n=3,max=10) :results output org
When evaluating R code in a persistent session, lines of output
typically start with a single prompt character. However, under certain
circumstances, lines start with a concatenation of (primary and
secondary) prompt characters separated by spaces. This seems to be
related to having blank lines in the input. This fix ensures that all
such prompt characters are removed from the output.
If a [:file filename.ext] header arg is provided, then all graphical
output from the source block is captured on disk, and output of the
source block is a link to the resulting file, as with the
graphics-only languages such as gnuplot, ditaa, dot, asymptote. An
attempt is made to find a graphics device corresponding to the file
extension (currently .png, .jpg, .jpeg, .tiff, .bmp, .pdf, .ps,
.postscript are recognised); if that fails, png format output is
created.
Additionally, values for several arguments to the R graphics
device can be passed using header args:
:width :height :bg :units :pointsize
:antialias :quality :compression :res :type
:family :title :fonts :version :paper :encoding
:pagecentre :colormodel :useDingbats :horizontal
Arguments to the R graphics device that are not supported as header
args can be passed as a string in R argument syntax, using the header
arg :R-dev-args
An example block is (although both bg and fg can be passed directly as
header args)
\#+begin_src R :file z.pdf :width 8 :height 8 :R-dev-args bg="olivedrab", fg="hotpink"
plot(matrix(rnorm(100), ncol=2), type="l")
\#+end_src
This includes the required changes to org-babel.el and a
language-specific implementation for emacs-lisp. The emacs-lisp
changes are from a patch by Benny Andresen.
