From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nicolas Goaziou <mail@nicolasgoaziou.fr>
Subject: Re: Babel: Why does noweb work differently depending on 'call
 depth'?
Date: Sat, 23 Jun 2018 15:46:26 +0200
Message-ID: <87a7rlvcnh.fsf@nicolasgoaziou.fr>
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	(Jherek@t-online.de's message of "Sat, 23 Jun 2018 15:08:42 +0200
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To: "Jherek@t-online.de" <Jherek@t-online.de>
Cc: "gnu.org, emacs-orgmode" <emacs-orgmode@gnu.org>

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