ghc-mod/CabalApi.hs
2013-02-12 14:21:48 +09:00

56 lines
1.9 KiB
Haskell

module CabalApi (
cabalParseFile,
cabalBuildInfo,
cabalDependPackages
) where
import Control.Applicative
import Data.Maybe (fromJust, maybeToList)
import Data.Set (fromList, toList)
import Distribution.Verbosity (silent)
import Distribution.Package (Dependency(Dependency), PackageName(PackageName))
import Distribution.PackageDescription
(GenericPackageDescription,
condLibrary, condExecutables, condTestSuites, condBenchmarks,
BuildInfo, libBuildInfo, buildInfo,
CondTree, condTreeConstraints, condTreeData)
import Distribution.PackageDescription.Parse (readPackageDescription)
----------------------------------------------------------------
cabalParseFile :: FilePath -> IO GenericPackageDescription
cabalParseFile = readPackageDescription silent
-- Causes error, catched in the upper function.
cabalBuildInfo :: GenericPackageDescription -> IO BuildInfo
cabalBuildInfo pd =
return . fromJust $ fromLibrary pd <|> fromExecutable pd
where
fromLibrary c = libBuildInfo . condTreeData <$> condLibrary c
fromExecutable c = buildInfo . condTreeData . snd <$> toMaybe (condExecutables c)
toMaybe [] = Nothing
toMaybe (x:_) = Just x
getDepsOfPairs :: [(a1, CondTree v [b] a)] -> [b]
getDepsOfPairs = concatMap (condTreeConstraints . snd)
allDependsOfDescription :: GenericPackageDescription -> [Dependency]
allDependsOfDescription pd =
concat [depLib, depExe, depTests, depBench]
where
depLib = concatMap condTreeConstraints (maybeToList . condLibrary $ pd)
depExe = getDepsOfPairs . condExecutables $ pd
depTests = getDepsOfPairs . condTestSuites $ pd
depBench = getDepsOfPairs . condBenchmarks $ pd
getDependencyPackageName :: Dependency -> String
getDependencyPackageName (Dependency (PackageName n) _) = n
cabalDependPackages :: GenericPackageDescription -> IO [String]
cabalDependPackages =
return . toList . fromList
. map getDependencyPackageName
. allDependsOfDescription