ghc-mod/Language/Haskell/GhcMod/World.hs
2015-11-26 14:52:25 +01:00

56 lines
1.8 KiB
Haskell

module Language.Haskell.GhcMod.World where
import Language.Haskell.GhcMod.GhcPkg
import Language.Haskell.GhcMod.PathsAndFiles
import Language.Haskell.GhcMod.Types
import Language.Haskell.GhcMod.Monad.Types
import Language.Haskell.GhcMod.Utils
import Control.Applicative
import Data.Maybe
import Data.Traversable hiding (mapM)
import System.FilePath ((</>))
import GHC.Paths (libdir)
import Prelude
data World = World {
worldPackageCaches :: [TimedFile]
, worldCabalFile :: Maybe TimedFile
, worldCabalConfig :: Maybe TimedFile
, worldCabalSandboxConfig :: Maybe TimedFile
, worldSymbolCache :: Maybe TimedFile
} deriving (Eq)
timedPackageCaches :: IOish m => GhcModT m [TimedFile]
timedPackageCaches = do
fs <- mapM (liftIO . mightExist) . map (</> packageCache)
=<< getPackageCachePaths libdir
(liftIO . timeFile) `mapM` catMaybes fs
getCurrentWorld :: IOish m => GhcModT m World
getCurrentWorld = do
crdl <- cradle
pkgCaches <- timedPackageCaches
mCabalFile <- liftIO $ timeFile `traverse` cradleCabalFile crdl
mCabalConfig <- liftIO $ timeMaybe (setupConfigFile crdl)
mCabalSandboxConfig <- liftIO $ timeMaybe (sandboxConfigFile crdl)
mSymbolCache <- liftIO $ timeMaybe (symbolCache crdl)
return World {
worldPackageCaches = pkgCaches
, worldCabalFile = mCabalFile
, worldCabalConfig = mCabalConfig
, worldCabalSandboxConfig = mCabalSandboxConfig
, worldSymbolCache = mSymbolCache
}
didWorldChange :: IOish m => World -> GhcModT m Bool
didWorldChange world = do
(world /=) <$> getCurrentWorld
isYoungerThanSetupConfig :: FilePath -> World -> IO Bool
isYoungerThanSetupConfig file World {..} = do
tfile <- timeFile file
return $ worldCabalConfig < Just tfile