249 lines
7.8 KiB
Haskell
249 lines
7.8 KiB
Haskell
-- ghc-mod: Making Haskell development *more* fun
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-- Copyright (C) 2015 Daniel Gröber <dxld ÄT darkboxed DOT org>
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--
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-- This program is free software: you can redistribute it and/or modify
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-- it under the terms of the GNU Affero General Public License as published by
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-- the Free Software Foundation, either version 3 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU Affero General Public License for more details.
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--
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-- You should have received a copy of the GNU Affero General Public License
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-- along with this program. If not, see <http://www.gnu.org/licenses/>.
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module Language.Haskell.GhcMod.PathsAndFiles where
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import Config (cProjectVersion)
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import Control.Applicative
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import Control.Monad
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import Control.Monad.Trans.Maybe
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import Data.List
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import Data.Char
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import Data.Maybe
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import Data.Traversable (traverse)
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import System.Directory
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import System.FilePath
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import System.IO.Unsafe
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import Language.Haskell.GhcMod.Types
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import Language.Haskell.GhcMod.Monad.Types
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import Language.Haskell.GhcMod.Error
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import Language.Haskell.GhcMod.Read
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import Language.Haskell.GhcMod.Utils hiding (dropWhileEnd)
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import qualified Language.Haskell.GhcMod.Utils as U
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-- | Guaranteed to be a path to a directory with no trailing slash.
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type DirPath = FilePath
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-- | Guaranteed to be the name of a file only (no slashes).
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type FileName = String
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data Cached d a = Cached {
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inputFiles :: [FilePath],
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inputData :: d,
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cacheFile :: FilePath
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}
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newtype UnString = UnString { unString :: String }
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instance Show UnString where
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show = unString
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instance Read UnString where
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readsPrec _ = \str -> [(UnString str, "")]
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-- |
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--
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-- >>> any (Just 3 <) [Just 1, Nothing, Just 2]
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-- False
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--
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-- >>> any (Just 0 <) [Just 1, Nothing, Just 2]
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-- True
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--
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-- >>> any (Just 0 <) [Nothing]
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-- False
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--
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-- >>> any (Just 0 <) []
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-- False
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cached :: forall a d. (Read a, Show a, Eq d, Read d, Show d)
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=> DirPath -> Cached d a -> IO a -> IO a
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cached dir Cached {..} ma = do
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ins <- (maybeTimeFile . (dir </>)) `mapM` inputFiles
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c <- maybeTimeFile (dir </> cacheFile)
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if any (c<) ins || isNothing c
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then writeCache
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else maybe ma return =<< readCache
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where
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maybeTimeFile :: FilePath -> IO (Maybe TimedFile)
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maybeTimeFile f = traverse timeFile =<< mightExist f
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writeCache = do
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a <- ma
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writeFile (dir </> cacheFile) $ unlines [show inputData, show a]
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return a
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readCache :: IO (Maybe a)
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readCache = runMaybeT $ do
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hdr:c:_ <- lines <$> liftIO (readFile $ dir </> cacheFile)
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if inputData /= read hdr
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then liftIO $ writeCache
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else MaybeT $ return $ readMaybe c
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-- | @findCabalFiles dir@. Searches for a @.cabal@ files in @dir@'s parent
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-- directories. The first parent directory containing more than one cabal file
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-- is assumed to be the project directory. If only one cabal file exists in this
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-- directory it is returned otherwise @findCabalFiles@ throws 'GMENoCabalFile'
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-- or 'GMETooManyCabalFiles'
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findCabalFile :: FilePath -> IO (Maybe FilePath)
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findCabalFile dir = do
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-- List of directories and all cabal file candidates
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dcs <- findFileInParentsP isCabalFile dir :: IO ([(DirPath, [FileName])])
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let css = uncurry appendDir `map` dcs :: [[FilePath]]
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case find (not . null) css of
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Nothing -> return Nothing
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Just cfs@(_:_:_) -> throw $ GMETooManyCabalFiles cfs
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Just (a:_) -> return (Just a)
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Just [] -> error "findCabalFile"
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where
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appendDir :: DirPath -> [FileName] -> [FilePath]
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appendDir d fs = (d </>) `map` fs
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-- |
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-- >>> isCabalFile "/home/user/.cabal"
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-- False
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isCabalFile :: FilePath -> Bool
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isCabalFile f = takeExtension' f == ".cabal"
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-- |
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-- >>> takeExtension' "/some/dir/bla.cabal"
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-- ".cabal"
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--
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-- >>> takeExtension' "some/reldir/bla.cabal"
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-- ".cabal"
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--
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-- >>> takeExtension' "bla.cabal"
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-- ".cabal"
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--
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-- >>> takeExtension' ".cabal"
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-- ""
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takeExtension' :: FilePath -> String
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takeExtension' p =
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if takeFileName p == takeExtension p
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then "" -- just ".cabal" is not a valid cabal file
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else takeExtension p
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-- | @findFileInParentsP p dir@ Look for files satisfying @p@ in @dir@ and all
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-- it's parent directories.
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findFileInParentsP :: (FilePath -> Bool) -> FilePath
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-> IO [(DirPath, [FileName])]
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findFileInParentsP p dir =
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getFilesP p `zipMapM` parents dir
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-- | @getFilesP p dir@. Find all __files__ satisfying @p@ in @.cabal@ in @dir@.
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getFilesP :: (FilePath -> Bool) -> DirPath -> IO [FileName]
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getFilesP p dir = filterM p' =<< getDirectoryContents dir
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where
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p' fn = do
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(p fn && ) <$> doesFileExist (dir </> fn)
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findCabalSandboxDir :: FilePath -> IO (Maybe FilePath)
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findCabalSandboxDir dir = do
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dss <- findFileInParentsP isSandboxConfig dir
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return $ case find (not . null . snd) $ dss of
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Just (sbDir, _:_) -> Just sbDir
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_ -> Nothing
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where
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isSandboxConfig = (=="cabal.sandbox.config")
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zipMapM :: Monad m => (a -> m c) -> [a] -> m [(a,c)]
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zipMapM f as = mapM (\a -> liftM ((,) a) $ f a) as
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-- | @parents dir@. Returns all parent directories of @dir@ including @dir@.
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--
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-- Examples
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--
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-- >>> parents "foo"
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-- ["foo"]
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--
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-- >>> parents "/foo"
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-- ["/foo","/"]
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--
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-- >>> parents "/foo/bar"
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-- ["/foo/bar","/foo","/"]
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--
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-- >>> parents "foo/bar"
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-- ["foo/bar","foo"]
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parents :: FilePath -> [FilePath]
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parents "" = []
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parents dir' =
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let (drive, dir) = splitDrive $ normalise $ dropTrailingPathSeparator dir'
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in map (joinDrive drive) $ parents' $ filter (/=".") $ splitDirectories dir
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where
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parents' :: [String] -> [FilePath]
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parents' [] | isAbsolute dir' = "":[]
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parents' [] = []
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parents' dir = [joinPath dir] ++ parents' (init dir)
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----------------------------------------------------------------
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-- | Get path to sandbox config file
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getSandboxDb :: FilePath -- ^ Path to the cabal package root directory
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-- (containing the @cabal.sandbox.config@ file)
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-> IO (Maybe GhcPkgDb)
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getSandboxDb d = do
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mConf <- traverse readFile =<< U.mightExist (d </> "cabal.sandbox.config")
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return $ PackageDb . fixPkgDbVer <$> (extractSandboxDbDir =<< mConf)
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where
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fixPkgDbVer dir =
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case takeFileName dir == ghcSandboxPkgDbDir of
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True -> dir
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False -> takeDirectory dir </> ghcSandboxPkgDbDir
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-- | Extract the sandbox package db directory from the cabal.sandbox.config file.
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-- Exception is thrown if the sandbox config file is broken.
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extractSandboxDbDir :: String -> Maybe FilePath
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extractSandboxDbDir conf = extractValue <$> parse conf
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where
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key = "package-db:"
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keyLen = length key
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parse = listToMaybe . filter (key `isPrefixOf`) . lines
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extractValue = U.dropWhileEnd isSpace . dropWhile isSpace . drop keyLen
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setupConfigFile :: Cradle -> FilePath
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setupConfigFile crdl = cradleRootDir crdl </> setupConfigPath
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-- | Path to 'LocalBuildInfo' file, usually @dist/setup-config@
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setupConfigPath :: FilePath
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setupConfigPath = "dist/setup-config" -- localBuildInfoFile defaultDistPref
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ghcSandboxPkgDbDir :: String
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ghcSandboxPkgDbDir =
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cabalBuildPlatform ++ "-ghc-" ++ cProjectVersion ++ "-packages.conf.d"
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cabalBuildPlatform :: String
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cabalBuildPlatform = dropWhileEnd isSpace $ unsafePerformIO $
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readLibExecProcess' "cabal-helper-wrapper" ["print-build-platform"]
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packageCache :: String
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packageCache = "package.cache"
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cabalHelperCache :: [String] -> Cached [String] [Maybe GmCabalHelperResponse]
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cabalHelperCache cmds = Cached {
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inputFiles = [setupConfigPath],
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inputData = cmds,
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cacheFile = setupConfigPath <.> "ghc-mod.cabal-helper"
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}
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-- | Filename of the symbol table cache file.
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symbolCache :: Cradle -> FilePath
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symbolCache crdl = cradleTempDir crdl </> symbolCacheFile
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symbolCacheFile :: String
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symbolCacheFile = "ghc-mod.symbol-cache"
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