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|
--
-- (c) The University of Glasgow, 2004
--
module PackageConfig (
-- * PackageId
PackageId,
mkPackageId, stringToPackageId, packageIdString, packageConfigId,
packageIdFS, fsToPackageId,
-- * The PackageConfig type: information about a package
PackageConfig,
InstalledPackageInfo(..), showPackageId,
Version(..),
PackageIdentifier(..),
defaultPackageConfig
) where
#include "HsVersions.h"
import Distribution.InstalledPackageInfo
import Distribution.Package
import Distribution.Version
import FastString
-- -----------------------------------------------------------------------------
-- Our PackageConfig type is just InstalledPackageInfo from Cabal. Later we
-- might need to extend it with some GHC-specific stuff, but for now it's fine.
type PackageConfig = InstalledPackageInfo
defaultPackageConfig = emptyInstalledPackageInfo
-- -----------------------------------------------------------------------------
-- PackageId (package names with versions)
-- Mostly the compiler deals in terms of PackageNames, which don't
-- have the version suffix. This is so that we don't need to know the
-- version for the -package-name flag, or know the versions of
-- wired-in packages like base & rts. Versions are confined to the
-- package sub-system.
--
-- This means that in theory you could have multiple base packages installed
-- (for example), and switch between them using -package/-hide-package.
--
-- A PackageId is a string of the form <pkg>-<version>.
newtype PackageId = PId FastString deriving( Eq, Ord ) -- includes the version
-- easier not to use a newtype here, because we need instances of
-- Binary & Outputable, and we're too early to define them
fsToPackageId :: FastString -> PackageId
fsToPackageId = PId
packageIdFS :: PackageId -> FastString
packageIdFS (PId fs) = fs
stringToPackageId :: String -> PackageId
stringToPackageId = fsToPackageId . mkFastString
packageIdString :: PackageId -> String
packageIdString = unpackFS . packageIdFS
mkPackageId :: PackageIdentifier -> PackageId
mkPackageId = stringToPackageId . showPackageId
packageConfigId :: PackageConfig -> PackageId
packageConfigId = mkPackageId . package
|
