patch applied (cabal): Add a unuque identifier for installed packages (part 3 of 9)

[Duncan Coutts]

Thu Aug  6 06:18:10 PDT 2009  Simon Marlow <marlowsd at gmail.com>
  * Add a unuque identifier for installed packages (part 3 of 9)
  Ignore-this: 455a736ea5a3241aa6040f4c684ab0b3
  
  This part adds the InstalledPackageIndex type to
  Distribution.Simple.PackageIndex.  Now that packages have a unique
  identifier within a package database, it makes sense to use this as
  the key for looking up installed packages, so InstalledPackageIndex is
  a mapping from InstalledPackageId to InstalledPackageInfo.
  
  Distribution.Simple.PackageIndex still supports other kinds of package
  mappings: PackageIndex is a mapping from PackageName.
  
  All the functions in the section "Special Queries" now work on
  InstalledPackageIndex rather than PackageFixedDeps pkg => PackageIndex
  pkg:
  
    topologicalOrder,
    reverseTopologicalOrder,
    dependencyInconsistencies,
    dependencyCycles,
    brokenPackages,
    dependencyClosure,
    reverseDependencyClosure
    dependencyGraph

    M ./Distribution/Simple/PackageIndex.hs -103 +146

View patch online:
http://darcs.haskell.org/cabal/_darcs/patches/20090806131810-12142-7676550c410480e947ad416aadd9eb70532567be.gz