[Rd] tab-complete for non-syntactic names could attempt backtick-wrapping

[Deepayan Sarkar]

On Thu, Mar 2, 2023 at 2:09 PM Ivan Krylov <krylov.r00t using gmail.com> wrote:
>
> There turn out to be a few more things to fix.
>
> One problem is easy to solve: vapply() needs a third argument
> specifying the type of the return value. (Can we have unit tests for
> tab completion?)

There are tests in

src/library/utils/tests/completion.R

which should get run by make check-devel (which runs R CMD check on
all base packages).

> The other problem is harder: `comps` defaults to an empty string, and
> you can't have a symbol consisting of an empty string, because this
> value is internally reserved for missing function arguments. I think
> you can return(paste0(prefix, op)) if length(comps) == 0L, but this is
> still somewhat worrying. R tries to prevent empty names, so I wouldn't
> expect specialOpCompletionsHelper() to return an empty string, but I
> can't prove it right now.
>
> On the other hand, x$'a string' is the same as x$`a string`. Could we
> just drop as.name() and keep the return value being a string literal?
> I'm not sure about this, either.

See my just-posted response on bugzilla for other issues to look out for.

Best,
-Deepayan

> --
> Best regards,
> Ivan
>
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