Re: [org-babel] Dynamic Tangle?

From: "Eric Schulte" <schulte.eric@gmail.com>
To: Nathan Neff <nathan.neff@gmail.com>
Cc: emacs-orgmode <emacs-orgmode@gnu.org>
Subject: Re: [org-babel] Dynamic Tangle?
Date: Mon, 13 Dec 2010 13:58:39 -0700	[thread overview]
Message-ID: <871v5lgzk0.fsf@gmail.com> (raw)
In-Reply-To: <AANLkTin_QDLQwPJi9xhY8+U7nz56Og7wCiVhtF+5gtpw@mail.gmail.com> (Nathan Neff's message of "Mon, 6 Dec 2010 22:57:58 -0600")

Hi Nathan,

The easiest way I can think of to accomplish templates would be through
some abuse of code block evaluation.  Maybe something like the following
would work...

** tangle templates
#+source: template-heading
#+begin_src emacs-lisp
  some stuff here
#+end_src

#+source: template-footing
#+begin_src emacs-lisp
  some other stuff here
#+end_src

#+source: template
#+begin_src sh :results output :noweb yes :var body="body stuff"
heading=$(cat<<EOF
<<template-heading>>
EOF
)
footing=$(cat<<EOF
<<template-footing>>
EOF
)
echo $heading
echo "$body"
echo $footing
#+end_src

#+call: template[:noweb yes](body="something new")

#+results: template[:noweb yes](body="something new")
: some stuff here
: something new
: some other stuff here

I hope this makes sense, and isn't too gross looking, for a really clean
implementation the template function could be located in a different org
file using the library of babel.

Note, that this relies upon an improvement to variable escaping that I
just pushed up to the latest version in git.

Best -- Eric

Nathan Neff <nathan.neff@gmail.com> writes:

> I'm preparing a presentation and I'm getting using tangle to show code /and/
> produce working code examples -- this is really cool.
>
> It is possible to define a "template" and pass code blocks to it?
> For example: (Using pseudo-org-babel-code for brevity)
>
> #+template
> header code
> <<code_that_is_passed_to_me>>
> footer code
>
> #+example1 :render #+template with 1111111
> 1111111111
>
> #+example2 :render #+template with 222222
> 222222222
>
> The tangled output would be:
>
> header code
> 11111111111
> footer code
>
> header code
> 2222222222
> footer code
>
> I'm already able to use org-babel like below, but I have to
> put a <<footer>> and a <<header>> in each code block.
>
> Here's my existing setup:
> #+header
> header code
>
> #+footer
> footer code
>
> #+example1
> <<header>>    <-- I have to specify these <<header>> and <<footer>> in
> each code block
> 11111111111
> <<footer>>
>
> #+example2
> <<header>>
> 2222222222
> <<footer>>
>
> Thanks again for org-babel -- I'll post my presentation when I get it done.
>
> --Nate
>
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