使R-package只加载其他软件包并导出所有功能

Question

Is it possible to make an R-package that just exports all functions from other R-packages? Is there another way to have the functions in a package categorized and ordered accordingly in the manual, code files etc.?

Answer 1

Yes, you can have a package that is invoked just for its dependencies. As a prominent example, the now-archived gregmisc package , which began as a huge collection of different functions, was eventually broken down into separate packages. While gregmisc was still available on CRAN it contained no functions, just this startup function:

.onAttach <- function(libname, pkgname)
{
  packageStartupMessage(
          "All functionality of the `gregmisc' package has been moved",
          "into the four 'g' packages: gdata, gtools, gmodels, and gplots. ",
          "This package is retained to make it easy to install and load",
          "the full set. Please consider loading these packages directly."
                        )
}

And then simply had dependencies on the new separated packages described in the DESCRIPTION file:

Package: gregmisc
Title: Greg's Miscellaneous Functions
Description: Description: The former gregmisc bundle is a repository
        for a variety of useful functions.  The gregmisc package has
        been split into a set of more focused packages: gdata, gmodels,
        gplots, gtools.  The purpose of this 'new' gregmisc is to
        provide an easy way to access the original combined
        functionality.  To this end, it simply depends on all of the
        new packages so that these will installed/loaded when this
        package is installed/loaded.
Depends: gdata, gmodels, gplots, gtools
Version: 2.1.5
Author: Gregory R. Warnes.
Maintainer: Gregory R. Warnes <greg@warnes.net>
License: GPL-2
Packaged: 2013-06-28 21:48:38 UTC; warnes
NeedsCompilation: no
Repository: CRAN
Date/Publication: 2013-06-29 00:15:57