Hi Sean,

Sean Whitton <spwhitton@spwhitton.name> writes:

> Hello,
>
> It would be great to stabilise this interface.  We would like to add
> package system metadata to the Emacs packages in Debian to track all the
> built-in packages.  We could do various useful things with that.
>
> Thanks to Xiyue for working on this, both here and over in the Debian
> BTS.  The sample interface looks good to me.
>

Thanks for pre-approving!  I have attached a draft patch for adding
those functions.  A slight change is to query `package--builtins' for
builtin package names as it contains a larger list of builtin packages
that may not have a version defined in `package--builtin-versions'.  I
also dropped "get" from the function names as it seems not to have been
used in the current code base.

Also, for completeness, I actually find there is a `package-built-in-p'
function for checking built-in packages.  But there is no way to get a
complete list of builtin packages, so package-builtin-packages is still
needed.  I also don't check whether a package is builtin in the added
`package-builtin-package-version' function and return nil for both
non-builtin packages and builtin packages without a version, as we can
use `package-built-in-p' to check the former.

> [...]

-- 
Regards,
Xiyue Deng