Add Jenkins Pipeline compatibility

[EmteZogaf]

These changes allow the usage of R plugin in pipeline scripts.

Re-submit of #1 because of accidental merge before review.

[kinow]

Looks nice @EmteZogaf

Will give it a try tonight, and if I can run an R script as before, and also within a pipeline, will merge and release :D

Thanks!

[kinow]

Actually, had to kill some time, so could test it right now 🎉

Used following script:

a <- c(1,2,3,4)
plot(a)

Success with normal freestyle job.

Success with pipeline job too, using:

node {
   rscript '''
   a <- c(1,2,3,4)
   plot(a)
   '''
}

@EmteZogaf how do you feel about changing from rscript to r, the function name?

[EmteZogaf]

OK, single-char commands look a bit strange to me. That's why I chose rscript. But like this is called r-plugin and not rscript-plugin it should be r.

[kinow]

Indeed @EmteZogaf , but since the language, plug-in, and file extension are "r", that was the first thing I tried (though I could have used the helper screens to pre-populate scripts or found in the code what was the func name).

Are you going to update the pull request, or should I merge and update it?

[EmteZogaf]

Updated

[kinow]

Thanks @EmteZogaf ! Preparing a release now.

[kinow]

Done. Announced in the biouno mailing list. Was also going to update a Wiki page, that I saw some time ago... I am quite sure there was a Wiki page with the list of plug-ins with pipeline compatibility, but alas I could not locate it.

Thanks again @EmteZogaf

[EmteZogaf]

Thanks for accepting the changes.
I found this list https://github.com/jenkinsci/pipeline-plugin/blob/master/COMPATIBILITY.md

[kinow]

That's the one that I had seen before. PR sent jenkinsci/pipeline-plugin#427

Thanks!

[jglick]

FWIW I do not think this kind of step is a good idea. Better left to libraries or macros.

But, see JENKINS-37011 & JENKINS-26055.