pubgrub-cabal-0.1.0.0: src/PubGrub/Cabal/PreInstalled.hs

-- | The solver's view of a unit that is already in the environment.
module PubGrub.Cabal.PreInstalled where

import           Distribution.Types.UnitId (UnitId)
import           PubGrub.Cabal.Version     (Version)

-- | A package already present in the environment: a unit ID, a version, and
-- dependencies on other pre-installed units. The 'UnitId' distinguishes
-- different builds of the same package — even two builds of the same version
-- are distinct instances, since they may depend on different units.
data PreInstalledPackage
    = PreInstalledPackage
    { pipUnitId       :: UnitId
    , pipVersion      :: Version
    , pipDependencies :: [UnitId]
    }
    deriving (Eq, Ord, Show)