build_vignette fails quietly if no knitr available

[barryrowlingson]

I have a package with a knitr-built .Rnw vignette, pulled it to a new machine with the latest R and devtools. Build the vignette:

 > build_vignettes("./colloc/")
 NULL

Nothing happens. Hmm. Try command line:

 Error in loadVignetteBuilder(pkgdir, TRUE) : 
   vignette builder 'knitr' not found

Installing knitr fixes the build_vignettes call.

Could build_vignettes produce an informative message as R CMD build does?

[hadley]

I just call tools::buildVignettes() so I'm a bit mystified as to why it doesn't complain.

What do you think about automatically installing the vignette builder package if needed?

[lock]

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