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Exact lookup

1. lookupByRecordName :: Name -> DatatypeInfo -> ConstructorInfo

   th-abstraction	Language.Haskell.TH.Datatype

   Given a DatatypeInfo, find the ConstructorInfo corresponding to the Name of one of its constructors.

2. lookupComponent :: PackageDescription -> ComponentName -> Maybe Component

   Cabal	Distribution.Simple.LocalBuildInfo

   No documentation available.

3. lookupComponentId :: PackageIndex a -> ComponentId -> Maybe a

   Cabal	Distribution.Simple.PackageIndex

   Does a lookup by component identifier. In the absence of Backpack, this is just a lookupUnitId.

4. lookupDependency :: InstalledPackageIndex -> PackageName -> VersionRange -> [(Version, [InstalledPackageInfo])]

   Cabal	Distribution.Simple.PackageIndex

   Does a lookup by source package name and a range of versions. We get back any number of versions of the specified package name, all satisfying the version range constraint. This does NOT work for internal dependencies, DO NOT use this function on those; use lookupInternalDependency instead. INVARIANT: List of eligible InstalledPackageInfo is non-empty.

5. lookupInternalDependency :: InstalledPackageIndex -> PackageName -> VersionRange -> LibraryName -> [(Version, [InstalledPackageInfo])]

   Cabal	Distribution.Simple.PackageIndex

   Does a lookup by source package name and a range of versions. We get back any number of versions of the specified package name, all satisfying the version range constraint. INVARIANT: List of eligible InstalledPackageInfo is non-empty.

6. lookupPackageId :: PackageIndex a -> PackageId -> Maybe a

   Cabal	Distribution.Simple.PackageIndex

   Convenient alias of lookupSourcePackageId, but assuming only one package per package ID.

7. lookupPackageName :: PackageIndex a -> PackageName -> [(Version, [a])]

   Cabal	Distribution.Simple.PackageIndex

   Does a lookup by source package name.

8. 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.

9. lookupUnitId :: PackageIndex a -> UnitId -> Maybe a

   Cabal	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.

10. lookupKnownProgram :: String -> ProgramDb -> Maybe Program

    Cabal	Distribution.Simple.Program

    No documentation available.

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