[babel] Conditional tangling possible

[babel] Conditional tangling possible

[Rainer M Krug]

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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
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Re: [babel] Conditional tangling possible

[Eric Schulte]

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

#+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

Re: [babel] Conditional tangling possible

[Rainer M Krug]

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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
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Re: [babel] Conditional tangling possible

[Eric Schulte]

Hi Rainer,

Rainer M Krug <r.m.krug@gmail.com> writes:

> 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?
>

My fault, I misread your original message, something like the following
should work.  You can use the uppermost elisp code block to change the
value of the tangle-tag to whichever tag you wish to be tangled.

--8<---------------cut here---------------start------------->8---
** conditional tangling
#+begin_src emacs-lisp :results silent
  (setq tangle-tag "right")
#+end_src

*** first subheading                                                   :left:
#+begin_src R :tangle (and (equal (car (org-get-tags-at (point))) tangle-tag) "yes")
  "first"
#+end_src

*** second subheading                                                 :right:
#+begin_src R :tangle (and (equal (car (org-get-tags-at (point))) tangle-tag) "yes")
  "second"
#+end_src
--8<---------------cut here---------------end--------------->8---

Cheers -- Eric