On 28/11/2011 2:48 PM, Hadley Wickham wrote:
It'd be cool if R CMD was user extensible through packages, so that (e.g.)
R CMD mypackage::mycommand
would do something like:
path<- system.file("cmd", paste(command, ".r"), package = package)
if (!file.exists(path)) {
stop("Command ", command, " in ", package, " does not exist")
} else {
source(path)
}
And maybe `R CMD mypackage` would look in mypackcage/cmd/default.r.
That does seem to mix up namespaces quite a bit. But what does it get
you that "Rscript -e" doesn't already give you? You can set up your
package so that
R CMD mypackage::mycommand
executes a function, using delayedAssign or some of the more exotic
features (like external pointers and finalizers).
Duncan Murdoch
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