Re: [babel] Conditional tangling possible

[Rainer M Krug <r.m.krug@gmail.com>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 31/08/10 02:06, Eric Schulte wrote:
> Hi Rainer,
> 
> The easiest way to do this should be,
> 
> --8<---------------cut here---------------start------------->8---
> ** pulling information from tags                                       :blue:
> 
> #+begin_src R :var color=(car (org-get-tags-at (point))) :tangle example.R
>   color
> #+end_src

OK - that looks good. That solves one problem.

But it is not actually conditional tangling? It is rather the transation
of a tag into a variable - or am I seeing something wrong?

I must admit I have chosen a bad example. The idea is really to have two
completely different definitions of a function, which is then tangled
depending on a tag (or property or whatever else I could use to make
this easy).

so:
- -8<---------------cut here---------------start------------->8---

** Here is the conditional tangle 		:SIM1
#+begin_src R :TANGLE_ONLY_IF__IN_TAGs SIM1 :tangle example.R
	simulate <- function() {
		# do something
		result <- 15
		return(result)
	}
#+end_src

#+begin_src R :TANGLE_ONLY_IF__IN_TAGs SIM2 :tangle example.R
	simulate <- function() {
		# do something else
		result <- -88
		return(result)
	}
#+end_src

- --8<---------------cut here---------------end--------------->8---

So if SIM1 is in the tags, tangle the first block, if SIM2 is in tags
then tangle the second block.

As I said, I do not have to use tags, properties would also work.

Cheers,

Rainer



> 
> #+results:
> : blue
> --8<---------------cut here---------------end--------------->8---
> 
> this will tangle to
> 
> --8<---------------cut here---------------start------------->8---
> color <- "blue"
> color
> --8<---------------cut here---------------end--------------->8---
> 
> Cheers -- Eric
> 
> Rainer M Krug <r.m.krug@gmail.com> writes:
> 
>> Hi
>>
>> I would like to have two different versions (not in the sense of version
>> control) of one program in one org file, and depending on the value if a
>> tag is set or not, tangle either the one or the other. The tangled file
>> has to have the same name.
>>
>> So essentially:
>>
>>
>>
>> ** Test Code              :VERSIONTAG
>> Version 1:
>> #+begin_src R :tangle result.R
>>   version <- 1
>>   x <- 10
>> #+end_src
>>
>> Version 2:
>> #+begin_src R :tangle result.R
>>   version <- 2
>>   x <- 13
>> #+end_src
>>
>> If VERSIONTAG is Version1, result.R should contain the code as in the
>> first code block, and if it is Version2, the code from the second code
>> block.
>>
>>
>> Is this possible?
>>
>> Cheers,
>>
>> Rainer


- -- 
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
Biology, UCT), Dipl. Phys. (Germany)

Centre of Excellence for Invasion Biology
Natural Sciences Building
Office Suite 2039
Stellenbosch University
Main Campus, Merriman Avenue
Stellenbosch
South Africa

Tel:        +33 - (0)9 53 10 27 44
Cell:       +27 - (0)8 39 47 90 42
Fax (SA):   +27 - (0)8 65 16 27 82
Fax (D) :   +49 - (0)3 21 21 25 22 44
Fax (FR):   +33 - (0)9 58 10 27 44
email:      Rainer@krugs.de

Skype:      RMkrug
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.10 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/

iEYEARECAAYFAkx8uvgACgkQoYgNqgF2egrL2QCePKP3mb6CKbjCVUk4l6zHWj0y
rMIAniSj/OO5laX3xETB5s+RKborhwS4
=0pMO
-----END PGP SIGNATURE-----