Ludovic Courtès (2014-07-22 01:26 +0400) wrote: > Alex Kost <alez...@gmail.com> skribis: > >> Ludovic Courtès (2014-07-21 20:04 +0400) wrote: > > [...] > >>> I think guix.el should be able to distinguish packages internally, so >>> that when I choose, say, a specific “guile-2.0.11”, that’s really the >>> one that gets installed (maybe it already does, I haven’t checked.) >> >> No it doesn't and I don't see how it can be done. > > A trick that may work is to propagate Scheme-side eq?-ness to the elisp > side using ‘object-address’: (object-address some-package) returns a > number that uniquely identifies ‘some-package’ for the duration of the > Guile session. > > [...] > >> I didn't think much about it, but right now this is the only workaround >> I can imagine. What do you think? > > What do you think of the trick above?
Ah, thanks, I didn't know about ‘object-address’, it will be a perfect ID. But I'm going to make a vhash of address/package pairs anyway, as I need ‘get-package-by-id’ and ‘get-packages-by-ids’ functions and I guess it is not possible to get an object by its address (?), so I think “(vhash-assq <address> <packages-vhash>)” will be the best choice to get a particular package. Thanks, Alex.
