[Rd] The Depends: field of a package is now used by library()
Prof Brian Ripley
ripley at stats.ox.ac.uk
Thu Aug 12 17:19:12 CEST 2004
On Thu, 12 Aug 2004, Deepayan Sarkar wrote:
> On Thursday 12 August 2004 07:34, Prof Brian Ripley wrote:
> > In R-devel, the Depends: field in the DESCRIPTION file is now used by
> > library() to load the named packages before the current package, and
> > also to set up the environment to save images and prepare for lazy
> > loading.
> How would this relate to namespaces? For instance, lattice imports grid
> (and a few things from stats and graphics). If I keep grid in the
> depends field, loading lattice does a require(grid), which defeats one
> of the purposes of having namespaces. If I leave it out, nothing bad
> seems to happen as long as grid is installed, but there should be some
> indication in the DESCRIPTION that that grid is a requirement. None of
> the other fields seem appropriate.
It's a grey area. As all copies of R that you are using will have grid,
leave it out of Depends: for lattice.
Perhaps we need to invent another field such as UsesNamespaces?
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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