[Rd] Generate .Rout.save files for vignettes

[Benjamin Hofner]

I am looking for a way to generate .Rout.save files for vignettes.
The manual "Writing R Extensions" states here [1] in item number 20:

"If there is a target output file .Rout.save in the vignette source 
directory, the output from running the code in that vignette is compared 
with the target output file."

Yet, there is no pointer on how to get the correct .Rout.save files for 
vignettes. (For the files in directory "test" there is a footnote on how 
to get the .Rout.save files. [2])

As a temporary solution, we currently use a script that calls 
tools:::.run_one_vignette() on each vignette and dumps the output:

echo 'tools:::.run_one_vignette("vignette.Rnw", docDir = ".");' | R 
--vanilla > vignette.Rout.save

However, this doesn't result in the same code as produced by R CMD 
check. E.g., we get the R startup header and furthermore get the output 
in German where localization is available (thus having differences when 
running R CMD check).

Does anyone have any hints on how to automatically get the correct 
results (i.e., without the header)? And is it possible to include these 
hints in the "Writing R extensions" manual for other users?

Any help is highly appreciated.
Best,
    Benjamin

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[1] http://cran.r-project.org/doc/manuals/R-exts.html#Checking-packages
[2] http://cran.r-project.org/doc/manuals/R-exts.html#fn-15