module CabalBounds.Main
( cabalBounds
) where
import Distribution.PackageDescription (GenericPackageDescription)
import Distribution.PackageDescription.Parse (parsePackageDescription, ParseResult(..))
import Distribution.PackageDescription.PrettyPrint (showGenericPackageDescription)
import Distribution.Simple.Configure (ConfigStateFileErrorType(..), tryGetConfigStateFile)
import Distribution.Simple.LocalBuildInfo (LocalBuildInfo)
import qualified CabalBounds.Args as A
import qualified CabalBounds.Bound as B
import qualified CabalBounds.Targets as T
import qualified CabalBounds.Dependencies as DP
import qualified CabalBounds.Drop as D
import qualified CabalBounds.Update as U
import qualified System.IO.Strict as SIO
import Control.Applicative ((<$>))
type Error = String
cabalBounds :: A.Args -> IO (Maybe Error)
cabalBounds args@A.Drop {} = do
pkgDescrp <- packageDescription $ A.cabalFile args
case pkgDescrp of
Left error -> return . Just $ error
Right pkgDescrp_ -> do
let pkgDescrp' = D.drop (B.bound args) (T.targets args) (DP.dependencies args) pkgDescrp_
writeFile (A.outputFile args) (showGenericPackageDescription pkgDescrp')
return Nothing
cabalBounds args@A.Update {} = do
pkgDescrp <- packageDescription $ A.cabalFile args
buildInfo <- localBuildInfo $ A.setupConfigFile args
case (pkgDescrp, buildInfo) of
(Left error, _) -> return . Just $ error
(_, Left error) -> return . Just $ error
(Right pkgDescrp_, Right buildInfo_) -> do
let pkgDescrp' = U.update (B.bound args) (T.targets args) (DP.dependencies args) pkgDescrp_ buildInfo_
writeFile (A.outputFile args) (showGenericPackageDescription pkgDescrp')
return Nothing
packageDescription :: FilePath -> IO (Either Error GenericPackageDescription)
packageDescription file = do
contents <- SIO.readFile file
case parsePackageDescription contents of
ParseFailed error -> return . Left $ show error
ParseOk _ pkgDescrp -> return . Right $ pkgDescrp
localBuildInfo :: FilePath -> IO (Either Error LocalBuildInfo)
localBuildInfo file =
either (Left . show) Right <$> tryGetConfigStateFile file
deriving instance Show ConfigStateFileErrorType