On Sun, 2009-02-08 at 14:29 +0100, Peter Robinson wrote:
2. How should that command look like? Something like: # cabal install --world
Yes, if anyone else has a suggestion on this pitch in. In gentoo we say:
$ emerge --upgrade world
ie world acts rather like a meta-package of all the things the user deliberately installed.
Mhm, I agree with that but I'm unsure how to relate meta-packages to normal packages: In my understanding a meta-package doesn't have a version, so it doesn't have a 'PackageIdentifier' (and can't be an instance of class Package).
Thanks very much Peter for having a go at this one. I promise I'll properly review your patch soon.
You might as well wait until I've figured out the meta-package stuff as that might require some changes.
Right, we just have to make up a version number, but if it's the only version available and there is no installed version then that's not a problem. See for example planLocalPackage in Distribution/Client/Install.hs. It makes up an AvailablePackage based on the local package and adds it to the index of available packages. Another alternative is to not treat it like a meta-package and instead of adding the world meta-package to the list of packages to resolve for, we add all the world entries to the list instead. So it would be equivalent to: $ cabal install $(cat ./world.list) Duncan