I agree with Not exactly. In this post
http://kitchingroup.cheme.cmu.edu/blog/2014/09/22/Showing-what-data-went-into-a-code-block-on-export/
I did something where I wanted to get information about the variables
passed into a block and show that on export. You might get some
inspiration from that. The result is at
http://kitchingroup.cheme.cmu.edu/media/2014-09-22-Showing-what-data-went-into-a-code-block-on-export/custom-src-table-export-3.html
Charles Berry writes:
Robert Klein roklein at roklein.de writes:
Hi,
is there a way, to read header arguments to source blocks in the
exporters org-exporter-src-block funktions?
Not directly. org-babel-exp-code has no provision for headers.
They get dropped.
E.g. is there a way to access :firstline in the example below?
Not exactly, but ...
If you precede the code block with
#+attr_firstline: 23
then with point in the src block
(org-element-property :attr_firstline (org-element-context))
will return (23). And org-*-src-block functions can use it.
If you really want to use the :firstline idiom, you can add a hook in
`org-export-before-processing-hook' to find :firstline headers and
insert #+attr_firstline lines in the buffer copy that the exporter is using.
#+begin_src c++ -n :firstline 23
static struct
{
char*entity;
unsigned char equiv;
} entities[] =
{
{ lt, '' } ,
{ gt, '' } ,
{ amp, '' } ,
{ quot, '' } ,
{ trade,153 } , /* trade mark */
#+end_src
I didn't find it in the `element' structure.
However, if I use
#+begin_src c++ firstline=23
// random C++
#+end_src
I could access :parameters from `element' and parse the string.
However I'm not sure if I'd break some babel stuff or not.
C-c C-v C-i on that src block shows that 'firstline=23' is treated as
a switch by babel. So if there is any language that tries to use that
as a switch (or has a regexp that matches it), there could be trouble.
But in C it looks innocuous.
If I'm trying to implement a firstline feature -- source blocks with
new line numbering (-n) beginning at a given line number -- I'd prefer
to use :firstline, but I didn't find anything to suggest `:XXX ZZ'
header arguments to source blocks are available to the exporters.
HTH,
Chuck
--
Professor John Kitchin
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803
@johnkitchin
http://kitchingroup.cheme.cmu.edu
