[R] Dependency-aware scripting tools for R

[Sean Davis]

There are numerous tools like scons, make, ruffus, ant, rake, etc.
that can be used to build complex pipelines based on task
dependencies.  These tools are written in a variety of languages, but
I have not seen such a thing for R.  Is anyone aware of a package
available?  The goal is to be able to develop robust bioinformatic
pipelines driven by scripts written in R.

Thanks,
Sean