Hugs does not provide version numbers for installed packages

[briansmith]

After installing WinHugs?, we can inspect the "packages" subdirectory to see what packages are installed. But, there is no way to tell what version of each package is installed. I know that Hugs does not provide a versioning mechanism for packages like GHC does, but it would be very helpful it it at least included a "version" file in each directory that contained the version number from the Cabal file.

[neil]

I'd have thought copying the whole .cabal file over would be best, so all the information is available. Then WinHugs? can give some user interface to load and display all the installed packages.

[ross]

When you install a package with cabal/hugs, the  InstalledPackageInfo is copied into the package directory (though it was putting it in the wrong place); the Hugs install ought to do the same.

On the other hand, InstalledPackageInfo is somewhat GHC-specific, so perhaps it would be better in both cases to just put in the package description, augmented with any buildinfo generated by package configuration.

[edoll]

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[guest]

Replying to ross:

On the other hand, InstalledPackageInfo is somewhat GHC-specific, so perhaps it would be better in both cases to just put in the package description, augmented with any buildinfo generated by package configuration.

Is there anything GHC-specific that would cause problems? Some fields can simply be ignored for hugs. It'd be nice if we could get ghc, nhc and hugs all using a collection of InstalledPackageInfo values for the package database.

In future Cabal will read back the whole InstalledPackageInfo when working with ghc so it can do module chasing. It'd be great if we could include hugs in such a scheme too. Currently Cabal doesn't know anything about the installed packages for hugs.