On 29/06/2014, 3:07 PM, Michael Lawrence wrote:
> 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?
I don't see why this is needed. What does it gain over documenting that
the symbol "help" is just a copy of the one from utils? As of this
morning, that's easy...
Duncan Murdoch
>
> Michael
>
>
> On Fri, Jun 27, 2014 at 8:32 PM, Yihui Xie <x...@yihui.name
> <mailto: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 <mailto:xieyi...@gmail.com>>
> Web: http://yihui.name
>
>
> On Fri, Jun 20, 2014 at 1:34 AM, Yihui Xie <x...@yihui.name
> <mailto: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 <mailto:xieyi...@gmail.com>>
> > Web: http://yihui.name
> >
> >
> > On Fri, Jun 20, 2014 at 12:19 AM, Winston Chang
> <winstoncha...@gmail.com <mailto:winstoncha...@gmail.com>> wrote:
> >> On Thu, Jun 19, 2014 at 3:15 PM, Martyn Plummer <plumm...@iarc.fr
> <mailto:plumm...@iarc.fr>> wrote:
> >>
> >>> Export filter in the NAMESPACE file *without copying it* in the
> R source
> >>> code.
> >>>
> >>>
> >> Ah, it works! Thank you!
> >>
>
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>
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