76 lines
2.4 KiB
Haskell
76 lines
2.4 KiB
Haskell
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{-# LANGUAGE RecordWildCards, CPP #-}
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module Language.Haskell.GhcMod.World (
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World
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, getCurrentWorld
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, isWorldChanged
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, isSetupConfigValid
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) where
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import Control.Applicative ((<$>))
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import Data.Traversable (traverse)
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import DynFlags (DynFlags(..))
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import Language.Haskell.GhcMod.CabalConfig
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import Language.Haskell.GhcMod.GhcPkg
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import Language.Haskell.GhcMod.Types
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import System.Directory (doesFileExist, getModificationTime)
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import System.FilePath ((</>))
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#if __GLASGOW_HASKELL__ <= 704
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import System.Time (ClockTime)
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#else
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import Data.Time (UTCTime)
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#endif
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#if __GLASGOW_HASKELL__ <= 704
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type ModTime = ClockTime
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#else
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type ModTime = UTCTime
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#endif
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data World = World {
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worldCabalFile :: Maybe FilePath
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, worldCabalFileModificationTime :: Maybe ModTime
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, worldPackageCache :: FilePath
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, worldPackageCacheModificationTime :: ModTime
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, worldSetupConfig :: FilePath
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, worldSetupConfigModificationTime :: Maybe ModTime
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} deriving (Show, Eq)
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getCurrentWorld :: Cradle -> DynFlags -> IO World
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getCurrentWorld crdl dflags = do
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cachePath <- getPackageCachePath crdl dflags
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let mCabalFile = cradleCabalFile crdl
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pkgCache = cachePath </> packageCache
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setupFile = setupConfigFile crdl
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mCabalFileMTime <- getModificationTime `traverse` mCabalFile
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pkgCacheMTime <- getModificationTime pkgCache
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exist <- doesFileExist setupFile
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mSeetupMTime <- if exist then
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Just <$> getModificationTime setupFile
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else
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return Nothing
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return $ World {
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worldCabalFile = mCabalFile
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, worldCabalFileModificationTime = mCabalFileMTime
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, worldPackageCache = pkgCache
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, worldPackageCacheModificationTime = pkgCacheMTime
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, worldSetupConfig = setupFile
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, worldSetupConfigModificationTime = mSeetupMTime
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}
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isWorldChanged :: World -> Cradle -> DynFlags -> IO Bool
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isWorldChanged world crdl dflags = do
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world' <- getCurrentWorld crdl dflags
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return (world /= world')
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isSetupConfigValid :: World -> Bool
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isSetupConfigValid World{ worldSetupConfigModificationTime = Nothing, ..} = False
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isSetupConfigValid World{ worldSetupConfigModificationTime = Just mt, ..} =
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cond1 && cond2
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where
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cond1 = case worldCabalFileModificationTime of
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Nothing -> True
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Just mtime -> mtime <= mt
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cond2 = worldPackageCacheModificationTime <= mt
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