R argparse: Line breaks in description - r

Question

I'm using the R package argparse to parse command line arguments in an R script.
For readability, I'd like to add line breaks in the "description" of the script and in the help of the arguments. However, I can't do it... Let's see an example. Given this script:
#!/usr/bin/env Rscript
require(argparse)
docstring<- "Description\nDone"
parser<- ArgumentParser(description= docstring)
args<- parser$parse_args()
When executed with -h it should print:
Description
Done
However, I'm getting the error:
Error in rjson::fromJSON(output) : unexpected character 'F'
Calls: <Anonymous> -> <Anonymous> -> <Anonymous>
Execution halted
Variation of docstring like paste("Description", "Done", sep= '\n') are equally unsuccessful.
EDIT: Passing RawTextHelpFormatter: No luck.
parser<- ArgumentParser(description= docstring, RawTextHelpFormatter= TRUE)
Any idea how to put line breaks in argparse?
Many thanks!
Dario
NB: Cross posted on r-help: https://stat.ethz.ch/pipermail/r-help/2014-November/423722.html
sessionInfo()
R version 3.0.1 (2013-05-16)
Platform: x86_64-apple-darwin10.8.0 (64-bit)
locale:
[1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] argparse_1.0.1 proto_0.3-10
loaded via a namespace (and not attached):
[1] findpython_1.0.1 getopt_1.20.0 rjson_0.2.13

Answer 1

After a while playing around and looking at the code, I found the solution to my own answer: Use formatter_class= 'argparse.RawTextHelpFormatter' and properly escape newline characters:
#!/usr/bin/env Rscript
require(argparse)
docstring<- "DESCRIPTION \\n\\
Do stuff \\n\\n\\
Do more stuff"
parser<- ArgumentParser(description= docstring, formatter_class= 'argparse.RawTextHelpFormatter')
args<- parser$parse_args()
Now it correctly gives (startup messages omitted):
./testParse.R -h
usage: ./testParse.R [-h]
DESCRIPTION
Do stuff
Do more stuff
optional arguments:
-h, --help show this help message and exit
#hpaulj your hint was correct it took me a while to figure it out!