Re: [babel] howto debug #+call lines

[Andreas Leha <andreas.leha@med.uni-goettingen.de>]

Eric Schulte <eric.schulte@gmx.com> writes:

> Andreas Leha <andreas.leha@med.uni-goettingen.de> writes:
>
>> Hi Eric,
>>
>>
>>> Andreas Leha <andreas.leha@med.uni-goettingen.de> writes:
>>>
>>>> Hi Eric,
>>>>
>>>>> Andreas Leha <andreas.leha@med.uni-goettingen.de> writes:
>>>>>
>>>>>> Hi all,
>>>>>>
>>>>>> I am getting different results from the evaluation of a source block and
>>>>>> the evaluation of a #+call line to that block.
>>>>>>
>>>>>> Therefore, my question: Is there an equivalent to
>>>>>> org-babel-expand-src-block (C-c C-v v) for #+call lines?
>>>>>>
>>>>>> Or more general:  How do I debug #+call lines?
>>>>>>
>>>>>> Regards,
>>>>>> Andreas
>>>>>>
>>>>>
>>>>> Can you provide a minimal example?
>>>>>
>>>>> You could write a code block equivalent to the call line.  E.g.,
>>>>>
>>>>>     #+call: foo(bar=1)
>>>>>
>>>>> is equivalent to
>>>>>
>>>>>     #+begin_src emacs-lisp :var results=foo(bar=1)
>>>>>       results
>>>>>     #+end_src
>>>>
>>>> Thanks for following this up.  I found the problem in my case:  The
>>>> header argument ':colnames yes' was missing from the call line, such that
>>>> the passed variables were different.  (I've fallen into that trap
>>>> repeatedly, but do not learn, as it seems...)
>>>>
>>>> It would have been a lot easier to find this, if I had had the possibility
>>>> to do C-c C-v v on the call line to get the chance to step through the
>>>> (R-) code that is evaluated.  Without this, it took me some time to
>>>> figure things out.
>>>>
>>>> So the question still stands: Is there the possibility to see what is
>>>> actually executed with a call line, similar to C-c C-v v on a source
>>>> block?
>>>>
>>>
>>> There is no body to expand in a call line so C-c C-v v would have
>>> nothing to show.  You can however jump to the related code block and
>>> call C-c C-v v there.  This process could be made faster by wrapping the
>>> org-babel-goto-named-src-block and org-babel-expand-src-block functions
>>> into a single function.
>>>
>>>
>>>>
>>>> For a small example consider:
>>>>
>>>> ---
>>>> #+name: foo
>>>> | bar |
>>>> | baz |
>>>> | bam |
>>>>
>>>> #+call: testblock[:var a=foo]() :colnames yes
>>>>
>>>> #+name: testblock
>>>> #+begin_src R :var a=foo :colnames yes
>>>>   a <- a[,1]
>>>>   data.frame(x=a)
>>>> #+end_src
>>>> ---
>>>>
>>>> Regards,
>>>> Andreas
>>>>
>>>>
>>
>> Thanks for the confirmation, that there is no possibility to expand a
>> #+call line.
>>
>> I know, that I can jump to the code block and expand that one (quite
>> fast with C-c C-v g RET C-c C-v v), but that is exactly *not* what I was
>> looking for.  Because then, the header arguments to the source code
>> block will apply instead of the header arguments to the #+call line.
>>
>> I was hoping for a C-c C-v v on #+call lines, which would spare me from
>> modifying the source block's header arguments.  But it is not a pressing
>> issue, just my laziness (and bad coding perhaps).
>>
>
> Patches are always welcome. :)

That's plagiarism.  You should cite Bastien here :)

>
> The call line is evaluated by first expanding itself into a full code
> block, so perhaps you could add functionality to C-c C-v v so that it
> will expand this ephemeral code block.  Additionally it may be easy to
> update C-c C-v I so that it works on call lines, which may provide the
> information you're after.

Thanks for the pointers.  Let's see whether I'll find time.  Should not
be hard even with my elisp "skills".

Regards,
Andreas