While the change to the symbol lookup is generally useful (e.g., for
finding S4 methods that become available whenever a package is loaded), it
seems that we ultimately want a mechanism by which a package namespace can
formally declare that it is re-exporting a symbol from some package. Then,
for example, the check mechanism can be made smart enough to avoid throwing
such warnings.
I've developed a proof-of-concept exportFrom() namespace directive. This is
the syntax:
exportFrom(utils, help)
Then:
> getNamespaceInfo("ReexportingPackage", "exports")$help
[1] "help"
attr(,"origin")
[1] "utils"
Comments?
Michael
On Fri, Jun 27, 2014 at 8:32 PM, Yihui Xie <x...@yihui.name> wrote:
> Hi Duncan,
>
> Again, thanks a lot for making this change (help requests are tried
> over all loaded instead of attached packages):
> https://github.com/wch/r-source/commit/21d2f7430b4 This makes what I
> proposed last time possible now: if pkg B imports FUN from A and
> re-exports it, ?FUN will work after B is attached because A will also
> be at least attached.
>
> Then it will be perfect if `R CMD check` can stop warning against the
> missing documentation, which is not really missing.
>
> Regards,
> Yihui
> --
> Yihui Xie <xieyi...@gmail.com>
> Web: http://yihui.name
>
>
> On Fri, Jun 20, 2014 at 1:34 AM, Yihui Xie <x...@yihui.name> wrote:
> > but note that you will have to document it even if it is a function
> > imported from another package... Perhaps help() should be intelligent
> > enough to link the documentation of `FUN` from package A for package B
> > when B imports `FUN` from A, and exports it in B's NAMESPACE. The
> > package name of A may be obtained from
> > environmentName(environment(FUN)). At the moment, since R CMD check
> > will warn against the missing documentation of `FUN` in B, I have to
> > copy FUN.Rd from A to B in this case, which seems to be inefficient
> > and not a best way to maintain. Did I miss anything in the R-exts
> > manual?
> >
> > Regards,
> > Yihui
> > --
> > Yihui Xie <xieyi...@gmail.com>
> > Web: http://yihui.name
> >
> >
> > On Fri, Jun 20, 2014 at 12:19 AM, Winston Chang <winstoncha...@gmail.com>
> wrote:
> >> On Thu, Jun 19, 2014 at 3:15 PM, Martyn Plummer <plumm...@iarc.fr>
> wrote:
> >>
> >>> Export filter in the NAMESPACE file *without copying it* in the R
> source
> >>> code.
> >>>
> >>>
> >> Ah, it works! Thank you!
> >>
>
> ______________________________________________
> R-devel@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
[[alternative HTML version deleted]]
______________________________________________
R-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
