Can I tell if an R script is running under littler? -

Can I tell if an R script is running under littler? -

python has handy construct:

def do_stuff(): whatever if __name__ == "__main__": do_stuff(()

so if file run command line python foo.py or ./foo.py , appropriate shebang line, __name__ variable set __main__ , file runs script. can from foo import do_stuff interactive shell or other python code , run do_stuff there. same script file acting module instead of script.

can similar in littler scripts? foo.r being:

#!/bin/env r do_stuff = function(){ whatever } if(?run r command_line?){ do_stuff() }

then can source("foo.r") , define do_stuff (in default global environment, we'll gloss on bit).

one possible key presence of _ in environment when running under littler (set script name) little stronger might nice.

something should work:

#!/usr/local/bin/r --vanilla dostuff <- function(print_me) { print(print_me) } if (!interactive()) { if (exists("argv")) { if (!is.null(argv) && length(argv)>0) { dostuff(argv[1]) } } }

r