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Within LTS Haskell 24.66 (ghc-9.10.3)
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localComponentId :: LocalBuildInfo -> ComponentIdCabal Distribution.Simple.LocalBuildInfo Extract the ComponentId from the public library component of a LocalBuildInfo if it exists, or make a fake component ID based on the package ID.
localUnitId :: LocalBuildInfo -> UnitIdCabal Distribution.Simple.LocalBuildInfo Extract the UnitId from the library component of a LocalBuildInfo if it exists, or make a fake unit ID based on the package ID.
allPackagesBySourcePackageId :: HasUnitId a => PackageIndex a -> [(PackageId, [a])]Cabal Distribution.Simple.PackageIndex Get all the packages from the index. They are grouped by source package id (package name and version). (Doesn't include private libraries)
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Cabal Distribution.Simple.PackageIndex Get all the packages from the index. They are grouped by source package id and library name. This DOES include internal libraries.
deleteSourcePackageId :: PackageId -> InstalledPackageIndex -> InstalledPackageIndexCabal Distribution.Simple.PackageIndex Removes all packages with this source PackageId from the index.
deleteUnitId :: UnitId -> InstalledPackageIndex -> InstalledPackageIndexCabal Distribution.Simple.PackageIndex Removes a single installed package from the index.
lookupComponentId :: PackageIndex a -> ComponentId -> Maybe aCabal Distribution.Simple.PackageIndex Does a lookup by component identifier. In the absence of Backpack, this is just a lookupUnitId.
lookupPackageId :: PackageIndex a -> PackageId -> Maybe aCabal Distribution.Simple.PackageIndex Convenient alias of lookupSourcePackageId, but assuming only one package per package ID.
lookupSourcePackageId :: PackageIndex a -> PackageId -> [a]Cabal Distribution.Simple.PackageIndex Does a lookup by source package id (name & version). There can be multiple installed packages with the same source PackageId but different UnitId. They are returned in order of preference, with the most preferred first.
lookupUnitId :: PackageIndex a -> UnitId -> Maybe aCabal Distribution.Simple.PackageIndex Does a lookup by unit identifier. Since multiple package DBs mask each other by UnitId, then we get back at most one package.