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Move common dependency resolver types into shared module
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----------------------------------------------------------------------------- | ||
-- | | ||
-- Module : Hackage.Dependency.Types | ||
-- Copyright : (c) Duncan Coutts 2008 | ||
-- License : BSD-like | ||
-- | ||
-- Maintainer : cabal-devel@haskell.org | ||
-- Stability : provisional | ||
-- Portability : portable | ||
-- | ||
-- Common types for dependency resolution. | ||
----------------------------------------------------------------------------- | ||
module Hackage.Dependency.Types ( | ||
DependencyResolver, | ||
) where | ||
|
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import Hackage.Types | ||
( UnresolvedDependency(..), AvailablePackage(..) ) | ||
import qualified Hackage.InstallPlan as InstallPlan | ||
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import Distribution.Package | ||
( Dependency ) | ||
import Distribution.InstalledPackageInfo | ||
( InstalledPackageInfo ) | ||
import Distribution.Simple.PackageIndex | ||
( PackageIndex ) | ||
import Distribution.Compiler | ||
( CompilerId ) | ||
import Distribution.System | ||
( OS, Arch ) | ||
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import Prelude hiding (fail) | ||
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-- | A dependency resolver is a function that works out an installation plan | ||
-- given the set of installed and available packages and a set of deps to | ||
-- solve for. | ||
-- | ||
-- The reason for this interface is because there are dozens of approaches to | ||
-- solving the package dependency problem and we want to make it easy to swap | ||
-- in alternatives. | ||
-- | ||
type DependencyResolver a = OS | ||
-> Arch | ||
-> CompilerId | ||
-> PackageIndex InstalledPackageInfo | ||
-> PackageIndex AvailablePackage | ||
-> [UnresolvedDependency] | ||
-> Either [Dependency] [InstallPlan.PlanPackage a] |
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