Dynamic tangle target?

Dynamic tangle target?

[Philip Hudson]

AFAICT :tangle takes only "yes", "no", or a literal pathname. How
might I dynamically generate a pathname for :tangle? I suppose what I
want is some kind of escape syntax for eval'ing a Lisp form, like
maybe:

    :tangle %(my-dynamic-filename-generator)

Sorry if I'm missing something basic and obvious; I'm new to tangling.
I've been looking for a few days and found nothing so far, and even
though I'm sure the answer is out there, it seemed like at this point
my best bet is just to ask the ML. Might the answer be something to do
with either declaring a variable or using noweb syntax? I'm pretty
much in the dark here.

-- 
Phil Hudson                   http://hudson-it.ddns.net
@UWascalWabbit                 PGP/GnuPG ID: 0x887DCA63

Re: Dynamic tangle target?

[Charles C. Berry]

On Wed, 21 Sep 2016, Philip Hudson wrote:

> AFAICT :tangle takes only "yes", "no", or a literal pathname.

Stuff like

    :tangle (my-lisp-function arg1 arg2)

will work.

> How
> might I dynamically generate a pathname for :tangle? I suppose what I
> want is some kind of escape syntax for eval'ing a Lisp form, like
> maybe:
>
>    :tangle %(my-dynamic-filename-generator)

Try this:

#+BEGIN_SRC R :tangle (concat "my-" "file" ".R")
abs <- def
#+END_SRC

just as an example.

BTW, org-babel-view-src-block-info (C-c C-v C-i) will show you what header 
args evaluate as without the need to eval or tangle them.

HTH,

Chuck

Re: Dynamic tangle target?

[Grant Rettke]

Most things that you can image are also listed here:

https://eschulte.github.io/org-scraps/

Awesome reading for Org-Mode Literate Programmers.
Sincerely,

Grant Rettke


On Wed, Sep 21, 2016 at 8:06 PM, Charles C. Berry <ccberry@ucsd.edu> wrote:
> On Wed, 21 Sep 2016, Philip Hudson wrote:
>
>> AFAICT :tangle takes only "yes", "no", or a literal pathname.
>
>
> Stuff like
>
>    :tangle (my-lisp-function arg1 arg2)
>
> will work.
>
>> How
>> might I dynamically generate a pathname for :tangle? I suppose what I
>> want is some kind of escape syntax for eval'ing a Lisp form, like
>> maybe:
>>
>>    :tangle %(my-dynamic-filename-generator)
>
>
> Try this:
>
> #+BEGIN_SRC R :tangle (concat "my-" "file" ".R")
> abs <- def
> #+END_SRC
>
> just as an example.
>
> BTW, org-babel-view-src-block-info (C-c C-v C-i) will show you what header
> args evaluate as without the need to eval or tangle them.
>
> HTH,
>
> Chuck
>