ghc-mod/Language/Haskell/GhcMod/CabalConfig.hs

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{-# LANGUAGE CPP #-}
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-- | This module facilitates extracting information from Cabal's on-disk
-- 'LocalBuildInfo' (@dist/setup-config@).
module Language.Haskell.GhcMod.CabalConfig (
CabalConfig
, cabalConfigDependencies
, cabalConfigFlags
) where
import Language.Haskell.GhcMod.Error
import Language.Haskell.GhcMod.GhcPkg
import Language.Haskell.GhcMod.Utils
import Language.Haskell.GhcMod.Read
import Language.Haskell.GhcMod.Types
import qualified Language.Haskell.GhcMod.Cabal16 as C16
import qualified Language.Haskell.GhcMod.Cabal18 as C18
import qualified Language.Haskell.GhcMod.Cabal21 as C21
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#ifndef MIN_VERSION_mtl
#define MIN_VERSION_mtl(x,y,z) 1
#endif
import Control.Applicative ((<$>))
import Control.Monad (mplus)
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#if MIN_VERSION_mtl(2,2,1)
import Control.Monad.Except ()
#else
import Control.Monad.Error ()
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#endif
import Data.Maybe ()
import Data.Set ()
import Data.List (find,tails,isPrefixOf,isInfixOf,nub,stripPrefix)
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import Distribution.Package (InstalledPackageId(..)
, PackageIdentifier(..)
, PackageName(..))
import Distribution.PackageDescription (FlagAssignment)
import Distribution.Simple.BuildPaths (defaultDistPref)
import Distribution.Simple.Configure (localBuildInfoFile)
import Distribution.Simple.LocalBuildInfo (ComponentName)
import MonadUtils (liftIO)
import System.FilePath ((</>))
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----------------------------------------------------------------
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-- | 'Show'ed cabal 'LocalBuildInfo' string
type CabalConfig = String
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-- | Get contents of the file containing 'LocalBuildInfo' data. If it doesn't
-- exist run @cabal configure@ i.e. configure with default options like @cabal
-- build@ would do.
getConfig :: (IOish m, MonadError GhcModError m)
=> Cradle
-> m CabalConfig
getConfig cradle = liftIO (readFile path) `tryFix` \_ ->
configure `modifyError'` GMECabalConfigure
where
prjDir = cradleRootDir cradle
path = prjDir </> configPath
configure :: (IOish m, MonadError GhcModError m) => m ()
configure =
withDirectory_ prjDir $ readProcess' "cabal" ["configure"] >> return ()
-- | Path to 'LocalBuildInfo' file, usually @dist/setup-config@
configPath :: FilePath
configPath = localBuildInfoFile defaultDistPref
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-- | Get list of 'Package's needed by all components of the current package
cabalConfigDependencies :: (IOish m, MonadError GhcModError m)
=> Cradle
-> PackageIdentifier
-> m [Package]
cabalConfigDependencies cradle thisPkg =
configDependencies thisPkg <$> getConfig cradle
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-- | Extract list of depencenies for all components from 'CabalConfig'
configDependencies :: PackageIdentifier -> CabalConfig -> [Package]
configDependencies thisPkg config = map fromInstalledPackageId deps
where
deps :: [InstalledPackageId]
deps = case deps21 `mplus` deps18 `mplus` deps16 of
Right ps -> ps
Left msg -> error msg
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-- True if this dependency is an internal one (depends on the library
-- defined in the same package).
internal pkgid = pkgid == thisPkg
-- Cabal >= 1.21
deps21 :: Either String [InstalledPackageId]
deps21 =
map fst
<$> filterInternal21
<$> (readEither =<< extractField config "componentsConfigs")
filterInternal21
:: [(ComponentName, C21.ComponentLocalBuildInfo, [ComponentName])]
-> [(InstalledPackageId, C21.PackageIdentifier)]
filterInternal21 ccfg = [ (ipkgid, pkgid)
| (_,clbi,_) <- ccfg
, (ipkgid, pkgid) <- C21.componentPackageDeps clbi
, not (internal . packageIdentifierFrom21 $ pkgid) ]
packageIdentifierFrom21 :: C21.PackageIdentifier -> PackageIdentifier
packageIdentifierFrom21 (C21.PackageIdentifier (C21.PackageName myName) myVersion) =
PackageIdentifier (PackageName myName) myVersion
-- Cabal >= 1.18 && < 1.21
deps18 :: Either String [InstalledPackageId]
deps18 =
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map fst
<$> filterInternal
<$> (readEither =<< extractField config "componentsConfigs")
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filterInternal
:: [(ComponentName, C18.ComponentLocalBuildInfo, [ComponentName])]
-> [(InstalledPackageId, PackageIdentifier)]
filterInternal ccfg = [ (ipkgid, pkgid)
| (_,clbi,_) <- ccfg
, (ipkgid, pkgid) <- C18.componentPackageDeps clbi
, not (internal pkgid) ]
-- Cabal 1.16 and below
deps16 :: Either String [InstalledPackageId]
deps16 = map fst <$> filter (not . internal . snd) . nub <$> do
cbi <- concat <$> sequence [ extract "executableConfigs"
, extract "testSuiteConfigs"
, extract "benchmarkConfigs" ]
:: Either String [(String, C16.ComponentLocalBuildInfo)]
return $ maybe [] C16.componentPackageDeps libraryConfig
++ concatMap (C16.componentPackageDeps . snd) cbi
where
libraryConfig :: Maybe C16.ComponentLocalBuildInfo
libraryConfig = do
field <- find ("libraryConfig" `isPrefixOf`) (tails config)
clbi <- stripPrefix " = " field
if "Nothing" `isPrefixOf` clbi
then Nothing
else case readMaybe =<< stripPrefix "Just " clbi of
Just x -> x
Nothing -> error $ "reading libraryConfig failed\n" ++ show (stripPrefix "Just " clbi)
extract :: String -> Either String [(String, C16.ComponentLocalBuildInfo)]
extract field = readConfigs field <$> extractField config field
readConfigs :: String -> String -> [(String, C16.ComponentLocalBuildInfo)]
readConfigs f s = case readEither s of
Right x -> x
Left msg -> error $ "reading config " ++ f ++ " failed ("++msg++")"
-- | Get the flag assignment from the local build info of the given cradle
cabalConfigFlags :: (IOish m, MonadError GhcModError m)
=> Cradle
-> m FlagAssignment
cabalConfigFlags cradle = do
config <- getConfig cradle
case configFlags config of
Right x -> return x
Left msg -> throwError (GMECabalFlags (GMEString msg))
-- | Extract the cabal flags from the 'CabalConfig'
configFlags :: CabalConfig -> Either String FlagAssignment
configFlags config = readEither =<< flip extractField "configConfigurationsFlags" =<< extractField config "configFlags"
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-- | Find @field@ in 'CabalConfig'. Returns 'Left' containing a user readable
-- error message with lots of context on failure.
extractField :: CabalConfig -> String -> Either String String
extractField config field =
case extractParens <$> find (field `isPrefixOf`) (tails config) of
Just f -> Right f
Nothing -> Left $ "extractField: failed extracting "++field++" from input, input contained `"++field++"'? " ++ show (field `isInfixOf` config)