* Babel: Why does noweb work differently depending on 'call depth'?
@ 2018-06-23 13:08 Jherek
2018-06-23 13:46 ` Nicolas Goaziou
0 siblings, 1 reply; 3+ messages in thread
From: Jherek @ 2018-06-23 13:08 UTC (permalink / raw)
To: gnu.org, emacs-orgmode
Hi list,
have spent hours with trying to de-mystify this issue, but no chance to get it.
Any hints or doc references are welcome.
Given a src block with a simple if clause depending on parameter p1:
#+NAME: decider
#+BEGIN_SRC emacs-lisp :var p1="tbd" :results output
(cond ((equal p1 "valA")(print "VALUE A"))
((equal p1 "valB")(print "B VALUE"))
(t (print (concat "ERROR: p1=>|" p1 "|< not handled" ))) )
#+END_SRC
Why does the following noweb call result in the t condition (and not in valB as expected)
although the p1 value seems to be received by the decider block:
#+BEGIN_SRC shell :var x="valB" :noweb yes :results output raw
echo -n <<decider(p1="$x")>>
#+END_SRC
== ERROR: p1=>|valB|< not handled
while hard coded param value will work (valA chosen to differentiate from x):
#+BEGIN_SRC shell :var x="valB" :noweb yes :results output raw
echo -n <<decider(p1="valA")>>
#+END_SRC
#+RESULTS:
VALUE A
Hard coded "valB" will work as well.
Different Linux Emacsen with org-mode 9+ show same results.
Thank you very much in advance,
Jherek
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Babel: Why does noweb work differently depending on 'call depth'?
2018-06-23 13:08 Babel: Why does noweb work differently depending on 'call depth'? Jherek
@ 2018-06-23 13:46 ` Nicolas Goaziou
2018-06-24 11:33 ` Jherek
0 siblings, 1 reply; 3+ messages in thread
From: Nicolas Goaziou @ 2018-06-23 13:46 UTC (permalink / raw)
To: Jherek@t-online.de; +Cc: gnu.org, emacs-orgmode
Hello,
"Jherek@t-online.de" <Jherek@t-online.de> writes:
> Hi list,
>
> have spent hours with trying to de-mystify this issue, but no chance to get it.
> Any hints or doc references are welcome.
>
>
> Given a src block with a simple if clause depending on parameter p1:
>
> #+NAME: decider
> #+BEGIN_SRC emacs-lisp :var p1="tbd" :results output
>
> (cond ((equal p1 "valA")(print "VALUE A"))
> ((equal p1 "valB")(print "B VALUE"))
> (t (print (concat "ERROR: p1=>|" p1 "|< not handled" ))) )
> #+END_SRC
>
>
> Why does the following noweb call result in the t condition (and not in valB as expected)
> although the p1 value seems to be received by the decider block:
>
> #+BEGIN_SRC shell :var x="valB" :noweb yes :results output raw
> echo -n <<decider(p1="$x")>>
> #+END_SRC
>
> == ERROR: p1=>|valB|< not handled
>
>
> while hard coded param value will work (valA chosen to differentiate from x):
>
> #+BEGIN_SRC shell :var x="valB" :noweb yes :results output raw
> echo -n <<decider(p1="valA")>>
> #+END_SRC
>
> #+RESULTS:
> VALUE A
>
> Hard coded "valB" will work as well.
Noweb expansion is done before references in the current source block
are resolved. You are sending p1="$x" instead of p1="valB".
Regards,
--
Nicolas Goaziou
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Babel: Why does noweb work differently depending on 'call depth'?
2018-06-23 13:46 ` Nicolas Goaziou
@ 2018-06-24 11:33 ` Jherek
0 siblings, 0 replies; 3+ messages in thread
From: Jherek @ 2018-06-24 11:33 UTC (permalink / raw)
To: Nicolas Goaziou; +Cc: gnu.org, emacs-orgmode
Thank you for this hint.
I still do not really get the reason, why the difference shows up only in the compare part of the cond
and works as expected in the t body, so I will go deeper into evaluation order and var replacement code.
Greetings
>> Noweb expansion is done before references in the current source block
>> are resolved. You are sending p1="$x" instead of p1="valB".
>> Regards,
>> Nicolas Goaziou
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2018-06-24 11:34 UTC | newest]
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2018-06-23 13:08 Babel: Why does noweb work differently depending on 'call depth'? Jherek
2018-06-23 13:46 ` Nicolas Goaziou
2018-06-24 11:33 ` Jherek
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