Re: [O][Babel] tangle - kind of macro expansion inside src blocks?

[Olaf.Hamann]

Hi Eric,

thank you very much, it works as announced.

I have probs with replacing/overlaying the built-in org-mode in my Emacs 
(w32-binary),
but that's not issue here.

After an eval-buffer of ob-tangle.el I can reproduce the expected result.

Exporting the buffer first is necessary, but that could be done by the 
pre-tangle-hook I hope.

Thank you very much for that quick feature patch.


Regards,

Olaf







Am 14.03.2011 16:35, schrieb Eric Schulte:
> Hello Olaf,
>
> I've just added a new hook through which you will be able to expand
> regular Org-mode style macros in code block bodies during export.  The
> following org-mode snippet demonstrates its use.
>
> First, add macro expansion to the new `org-babel-tangle-body-hook'.
>
> #+begin_src emacs-lisp :results silent
>    (add-hook 'org-babel-tangle-body-hook
>              (lambda () (org-export-preprocess-apply-macros)))
> #+end_src
>
> Then define the macro.  Note: you may need to export the buffer before
> tangling so that the macro definition is noticed and processed by
> Org-mode.
>
> #+MACRO: CONFIG_PARAM01 45
>
> Then on both export and tangling the macro in the following code block
> will be replaced.
>
> #+begin_src sh :tangle yes
>    echo org-mode set CONFIG_PARAMETER to: {{{CONFIG_PARAM01}}}
> #+end_src
>
> Cheers -- Eric
>
> "Olaf.Hamann"<address@hidden>  writes:
>
> > Hello all,
> >
> > is there a way to do so or are there plans to integrate
> > a macro expansion mechanism into org-babel-tangle
> > like that one org-mode already provides?
> >
> > #+MACRO: name replacement
> > {{{name}}}
> >
> >
> > I would like to replace config parameter in begin_src...end_src blocks.
> > Change at one place in org-file shall change values in tangled code-files.
> >
> > I helped myself with an ugly hack in org-babel-tangle,
> > so that following lines work for me at the moment.
> >
> > #+MACRO CONFIG_PARAM01 45
> >
> > #+begin_src sh :tangle file1.sh
> >       echo org-mode set CONFIG_PARAMETER to: {{{CONFIG_PARAM01}}}
> > #+end_src
> > #+begin_src sh :tangle file2.sh
> >       echo org-mode set CONFIG_PARAMETER to: {{{CONFIG_PARAM01}}}
> > #+end_src
> >
> > (this is an example only - the language which I tangle to is not good at
> > local vars support,
> > so using $CONFIG_PARAMETER inside tangled code is no solution to me)
> >
> > But this is no solution, so I ask whether there is already some
> > functionality to do like this,
> > which will nicely fit into the aspects of different languages to be used
> > in src blocks.
> > Work of org-babel-detangle will be harder when using such a macro
> > functionality
> > (supported languages need inline comments, what to do with other? ).
> >
> > Regards,
> > Olaf