Feature request: a reference topic holding all exported objects

[mmuurr]

While developing one's own package, or inheriting someone else's (which is somewhat common in my work environment), it would be helpful to be able to generate a reference page with simply all exported objects (and for functions, including their signatures).

This can already be done a few ways by adding tags to each such object and/or using the {pkgdown} selectors, like starts_with().
But in the desire to simultaneously add documentation while also using & improving such packages, it would be very helpful to generate a reference page/section that simply lists all exported objects (say, as determined by the NAMESPACE file).

I've come up with a few ways to try to do this in an automated fashion (e.g. by reading NAMESPACE and dynamically editing the _pkdown.yml file) but they all feel very much like hacks, and I'm surprised something simple doesn't already exist with {pkgdown} and {roxygen2}, as many other languages/ecosystems have some mechanism in place to simply provide a web-based digest of 'public' (and sometimes 'private') objects.

The ideal solution would require only the most minimal {roxygen2} namespace-management tags (specifically, @export), not any specific documentation tag -- as in the inheriting-someone-else's-code case this means reading the code in order to generate a tool that helps one ... read the code 😆.