Re: [babel] References to variable block names

From: Francesco Pizzolante <fpz-djc/iPCCuDYQheJpep6IedvLeJWuRmrY@public.gmane.org>
To: Eric Schulte <schulte.eric-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: mailing-list-org-mode <emacs-orgmode-mXXj517/zsQ@public.gmane.org>
Subject: Re: [babel] References to variable block names
Date: Thu, 13 Jan 2011 09:33:22 +0100	[thread overview]
Message-ID: <874o9dmcdp.fsf@mundaneum.com> (raw)
In-Reply-To: <87y66qrsko.fsf-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> (Eric Schulte's message of "Wed, 12 Jan 2011 09:32:23 -0700")

Dear Eric,

Thanks for your answer.

> In your example the cv source block only seems to have a single variable
> specified with a :var header argument (namely v-jobtitle), e.g.
>
> #+srcname: cv
> #+begin_src latex :noweb yes :var v-jobtitle="Software Engineer"
> ...
> #+end_src
>
> however your example noweb reference uses 4 variables.  You will need to
> update the cv source block so that each variable is given a header
> argument.
>
> #+srcname: cv
> #+headers: :var v-firstname="Alex" :var v-familyname="Pizzo"
> #+headers: :var v-jobtitle="Project Manager" :var employee="alex"
> #+begin_src latex :noweb yes :var v-jobtitle="Software Engineer"
> ...
> #+end_src

Well, the variable replacement works even if I do not specify the variables in
a header argument. It seems to work like a simple string replace for each
'variable="value"' parameter in the noweb reference.

When I write this:

--8<---------------cut here---------------start------------->8---
<<cv(v-firstname="Albert")>>
--8<---------------cut here---------------end--------------->8---

When I tangle/evaluate the code, it replaces any occurrence of "v-firstname"
in the cv source code by "Albert" even if the variable is not given a header
argument...

Seems like the header argument is "just" used to give a default value for the
replacement.

Is this the expected behavior?

> Then ensure that you can call the cv function using a call line, e.g.
>
> #+call: cv(v-firstname="Alex",v-familyname="Pizzo",v-jobtitle="Project Manager",employee="alex")
>
> Once that is working then the noweb reference should work as well.

I tried what you say, but it seems that a variable in a noweb reference does
not get replaced by its value. From my point of view, it seems that:

- either, the noweb references are replaced before the variables get replaced
  by their values;

- or, the variable replacement does not work in noweb references.

Here's a shorter example where, whatever I try, I keep getting the Profile
section empty:

--8<---------------cut here---------------start------------->8---
* Alex

#+call: cv(employee="alex")

#+srcname: cv-alex
#+begin_src latex :noweb yes :tangle alex.tex
<<cv(employee="alex")>>
#+end_src

** Profile

#+srcname: profile-alex
#+begin_src latex
Software engineering expert.
#+end_src

* Composed CV
#+srcname: cv
#+begin_src latex :noweb yes :var employee="alex"
\documentclass{mycvclass}
\usepackage[utf8x]{inputenc}

\begin{document}

\section{Profile}
<<profile-employee>>

\end{document}
#+end_src
--8<---------------cut here---------------end--------------->8---

Any help is welcome.

Thanks,
Francesco

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