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Within LTS Haskell 24.63 (ghc-9.10.3)

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Exact lookup

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

   Cabal	Distribution.Simple.PackageIndex

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

2. 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.

3. 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.

4. programId :: ConfiguredProgram -> String

   Cabal	Distribution.Simple.Program

   Just the name again

5. programOverrideArgs :: ConfiguredProgram -> [String]

   Cabal	Distribution.Simple.Program

   Override command-line args for this program. These flags will appear last on the command line, so they override all earlier flags.

6. programOverrideEnv :: ConfiguredProgram -> [(String, Maybe String)]

   Cabal	Distribution.Simple.Program

   Override environment variables for this program. These env vars will extend/override the prevailing environment of the current to form the environment for the new process.

7. suppressOverrideArgs :: ConfiguredProgram -> ConfiguredProgram

   Cabal	Distribution.Simple.Program

   Suppress any extra arguments added by the user.

8. ghcOptHiDir :: GhcOptions -> Flag FilePath

   Cabal	Distribution.Simple.Program.GHC

   No documentation available.

9. ghcOptHideAllPackages :: GhcOptions -> Flag Bool

   Cabal	Distribution.Simple.Program.GHC

   Start with a clean package set; the ghc -hide-all-packages flag

10. ghcOptThisComponentId :: GhcOptions -> Flag ComponentId

    Cabal	Distribution.Simple.Program.GHC

    GHC doesn't make any assumptions about the format of definite unit ids, so when we are instantiating a package it needs to be told explicitly what the component being instantiated is. This only gets set when ghcOptInstantiatedWith is non-empty

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