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{-# LANGUAGE CPP #-}
import Distribution.PackageDescription (package, packageDescription)
#if __GLASGOW_HASKELL__ < 904
import Distribution.PackageDescription.Parsec (readGenericPackageDescription)
#else
import Distribution.Simple.PackageDescription (readGenericPackageDescription)
#endif
import Distribution.Pretty (prettyShow)
import Distribution.Types.PackageId (PackageIdentifier, pkgVersion)
import Distribution.Verbosity (silent)
import System.Environment (getArgs)
getPackageId :: IO PackageIdentifier
getPackageId = do
args <- getArgs
gpd <- readGenericPackageDescription silent (head args)
return $ package $ packageDescription gpd
packageVersion :: PackageIdentifier -> String
packageVersion =
prettyShow . pkgVersion
main :: IO ()
main = do
pkgid <- getPackageId
putStrLn $ packageVersion pkgid
return ()
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