[O] [babel] would like to to do simple text block expansion with parameters or multiline macro replacement text

[Olaf.Hamann]

Hello all,

I'm very happy with all the new features I discovered in org-babel 
(since 6.8 or so) and played around a lot trying to convert my old 
funnelweb-techniques (kind of LPstuff) into org-babel and now I'm a 
little confused with all that elaborated stuff like header arguments, 
result options :var types and function calls and so on :-)

Is there an easy way to do a simple text block expansion with 
parameters, I mean sth like this:

#+begin_src xsl :tangle outputfile :noweb tangle
{{{gCV(argument1,param2)}}}
<<other_srcblockvalueWhenTangeling()>>
#+end_src

#+MACRO: gCV replacement text...
...spread over different...
...multiple lines  with arguments like $1 ...
...and $2 and so on...
...
#+end_macro

Multiline macros did not work in my tries (Org version 7.8.03 with Emacs 
version 24)

For expanding macros inside srcblocks I got this hint from the list some 
time ago what works really fine:

#+begin_src emacs-lisp :results silent :exports none
  (add-hook 'org-babel-tangle-body-hook
            (lambda () (org-export-preprocess-apply-macros)))
#+end_src


Below I give an executable example in org-code. It's stripped down from 
my work.
It works fine, but I would like to get rid of the lisp-concat and 
string-quoting and wonder if org-mode does not offer another way.


Thank you very much in advance,
Olaf

====

* simple text block expansion with parameters

#+NAME: gCV(PDEF="param_pdef",XPATH="param_value")
#+begin_src emacs-lisp :results value   :exports results :noweb tangle
          (concat
                "    <xsl:when test=\"$pdef-identifier = '" PDEF  "'\">
                              <xsl:value-of select=\"" XPATH "\" />
                      </xsl:when> " )
#+end_src


#+begin_src xsl :tangle mappings.xslt :noweb tangle
      <xsl:variable name="oneOfMany">
         <xsl:choose>
           <<gCV("Condition001","$tree/some/node/@value")>>
           <<gCV("Condition002","$tree/some/other/node/text()")>>
           <xsl:otherwise/>
         </xsl:choose>
      </xsl:variable>
#+end_src

====

Output looks like expected:

<xsl:variable name="oneOfMany">
<xsl:choose>
     <xsl:when test="$pdef-identifier = 'Condition001'">
           <xsl:value-of select="$tree/some/node/@value" />
           </xsl:when>
     <xsl:when test="$pdef-identifier = 'Condition002'">
           <xsl:value-of select="$tree/some/other/node/text()" />
                    </xsl:when>
<xsl:otherwise/>
</xsl:choose>
</variable>