Re: [O] [babel] adding a language - problems

[Thorsten]

Eric Schulte <address@hidden> writes:

> Thorsten <address@hidden> writes:
>
>> Thorsten <address@hidden> writes:
>>
>>> Hi list, 
>>> I'm on my way to add a new (intrpreted) lisp dialect to org-babel, but
>>> encounter a few difficulties. Here is my little testprogramm:
>>>
>>> ---------------------
>>> #+tblname: tbl1
>>> | 1 | 2 | 3 |
>>> |---+---+---|
>>> | 4 | 5 | 6 |
>>> | 7 | 8 | 9 |
>>>
>>>
>>> # external evaluation (no session)
>>> #+srcname: pico-calc
>>> #+begin_src picolisp :var tab=tbl1 :results value :hlines no 
>>>   (+ (caar tab) (caar (cdr tab)))
>>> #+end_src
>>>
>>> # org-babel-error output:
>>> [/tmp/babel-22634XBd/picolisp-script-22634K-K:1] !? (display (prog (let
>>> (tab '((1 2 3) (4 5 6) (7 8 9))) (+ (caar tab) (caar (cdr tab))))))
>>> display -- Undefined
>>>
>>>
>>> #  with session
>>> #+srcname: pico-calc
>>> #+begin_src picolisp :var tab=tbl1 :results value :hlines no :session "p1"
>>>   (+ (caar tab) (caar (cdr tab)))
>>> #+end_src
>>>
>>> #+results: pico-calc
>>> [finishes with no output]
>>>
>>> # session buffer:
>>> (prog (let (tab '((1 2 3) (4 5 6) (7 8 9))) 
>>> (+ (caar tab) (caar (cdr tab)))) )
>>> "org-babel-picolisp-eoe"
>>> -> 5
>>> : -> "org-babel-picolisp-eoe"
>>>
>>> ---------------
>>>
>>> I do not know where undefined 'display' comes from in the error message
>>> - seems to be a org-babel internal thing. What can I do about that,
>>> where do I have to look?
>>>
>>> The session evaluation works already, but there is a problem with the
>>> eoe string. If I don't use it, Emacs hangs forever - waiting for the
>>> session to return? If I use it, the right value is calculated, but not
>>> returned - because the eoe string is evaluated after the source-body?
>>>
>
> I assume you're using `org-babel-comint-with-output' to collect results?
> If you're still having issues I'd suggest looking at some of the other
> uses of this function in other ob-*.el files for example of ways that
> it's use can be customized through code in the BODY section.

yes, I use org-babel-comint-with-output more or less in the way it is
used in ob-scheme.el. 

>
>>>
>>> Thanks for any tips Thorsten
>>
>>
>> Sorry, I encountered the undefined 'display' in source code I copied
>> from ob-scheme, I deleted it, and then external evaluation succeeded -
>> but again without output. 
>
> Hopefully ":results output" is already working and it is just ":results
> value" which requires more work.

No, it isn't working - same thing as with :results value - no error
messages, but nothing is returned either and no output. I have to take a
deeper look at whats happening behind the scenes.

>  "results value" external evaluation
> generally works by wrapping the body of the code block in a form which
> will collect the result of the code block and print them to STDOUT.
> Writing this wrapped body to a temporary file, evaluating this temporary
> file, and then collecting the results from STDOUT.  I'd suggest
> confirming that each of the above steps are working independently.
>
>> 
>> So I seem to be quite close, evaluation work and the right value is
>> calculated - but not returned yet.
>>
>
> I hope the above helps.  Let me know if you run into any more issues.
>
> Cheers -- Eric

Thanks so far, I'll try to understand the workings of ob.el & friends
better and then hope to get things to work.  

cheers
Thorsten