Nothing
###########################################################################/**
# @RdocDefault systemR
# @alias systemR
#
# @title "Launches another R process from within R"
#
# @synopsis
#
# \description{
# @get "title" via @see "base::system" by automatically locating the
# R executable, cf [1].
# }
#
# \arguments{
# \item{command}{A @character string be appended to the @see "base::system"
# call. If a @vector, then the strings are concatenated separated
# with a space.}
# \item{...}{Additional arguments passed to @see "base::system".}
# \item{Rcommand}{A @character string specifying the basename of
# the R executable.}
# \item{verbose}{A @logical or a @see "Verbose" object.}
# }
#
# \value{
# Returns what @see "base::system" returns.
# }
#
# @examples "../incl/systemR.Rex"
#
# @author
#
# \references{
# [1] R-devel thread 'Best way to locate R executable from within R?',
# May 22, 2012.
# }
#
# \seealso{
# The R executable is located using @see "base::R.home", which
# is then launched using @see "base::system".
# }
#
# @keyword programming
# @keyword IO
#*/###########################################################################
setMethodS3("systemR", "default", function(command="", ..., Rcommand="R", verbose=FALSE) {
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Validate arguments
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Argument 'command':
command <- Arguments$getCharacters(command)
# Locate the R executable, cf. help("R.home") and [1].
# NB: R.home() is guaranteed to return a path without spaces.
Rpath <- R.home("bin")
Rpath <- Arguments$getReadablePath(Rpath, mustExist=TRUE)
# Argument 'Rcommand':
Rcommand <- Arguments$getCharacter(Rcommand)
verbose <- Arguments$getVerbose(verbose)
if (verbose) {
pushState(verbose)
on.exit(popState(verbose), add=TRUE)
}
# Setup the full system command
Rbin <- file.path(Rpath, Rcommand)
command <- paste(command, collapse=" ")
command <- paste(command, sep=" ")
cmd <- sprintf('%s %s', shQuote(Rbin), command)
verbose && cat(verbose, "System command: ", cmd)
system(cmd, ...)
})
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