I’m just wondering if there is a way to get some kind of notification when specific packages are available in a newer version because a channel has advanced.
E.g. I am interested in the availability of newer versions emacs than the one I have installed so I would like to be notified when a newer version of the emacs package is available in any channel
Maybe it would be useful in general to have a list of package version changes between two states of a channel or two channels in general.
nix-env --upgrade prints some kind of version comparison when running. Is this something which is available with broader applicability that could be used for that?