Re: Unexpected behaviour with gnuplot source blocks

[Achim Gratz <Stromeko@nexgo.de>]

Eric Schulte writes:
>> #+BEGIN_SRC gnuplot :file test.eps
>>   reset
>       ^
>   WRT |, I've also added the *org-babel-gnuplot-prefix* variable, which
> may be set to e.g., "reset" to reset the gnuplot process between code
> blocks.

We have recently introduced similar functionality in ob-perl and it
probably deserves a more general treatment and easier customization.
Doing these things with defcustoms or defvars should be shunned, since
it makes Org files using these options inherently unportable and
non-self-contained.

For the functionality that is implemented here, I'd think two new
general header arguments are appropriate, namely :prolog and :epilog,
which should take the name of a source block (same language), a literal
string in quotes, the result of an inline call of another source block
and inline elisp (the result of execution must be in the appropriate
syntax) as an argument.  We might need some friendlier way than elisp if
we want to use URL (esp. file:…) in the same capacity.  For session
execution there may be a need to distibguish between the session start,
subsequent invocations and perhaps closing of the session (we don't have
that at the moment, I think).


Regards,
Achim.
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