173 lines
5.4 KiB
Haskell
173 lines
5.4 KiB
Haskell
{-# LANGUAGE BangPatterns, TupleSections #-}
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module Language.Haskell.GhcMod.PathsAndFiles where
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import Config (cProjectVersion, cTargetPlatformString)
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import Control.Applicative
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import Control.Monad
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import Data.List
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import Data.List.Split (splitOn)
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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 Language.Haskell.GhcMod.Types
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import System.Directory
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import System.FilePath
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import Language.Haskell.GhcMod.Error
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import qualified Language.Haskell.GhcMod.Utils as U
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import Distribution.Simple.BuildPaths (defaultDistPref)
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import Distribution.Simple.Configure (localBuildInfoFile)
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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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-- | @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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dcs <- findFileInParentsP isCabalFile dir
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-- Extract first non-empty list, which represents a directory with cabal
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-- files.
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case find (not . null) $ uncurry appendDir `map` dcs of
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Just [] -> throw $ GMENoCabalFile
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Just cfs@(_:_:_) -> throw $ GMETooManyCabalFiles cfs
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a -> return $ head <$> a
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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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appendDir :: DirPath -> [FileName] -> [FilePath]
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appendDir d fs = (d </>) `map` fs
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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 = localBuildInfoFile defaultDistPref
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ghcSandboxPkgDbDir :: String
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ghcSandboxPkgDbDir =
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targetPlatform ++ "-ghc-" ++ cProjectVersion ++ "-packages.conf.d"
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where
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targetPlatform = display buildPlatform
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packageCache :: String
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packageCache = "package.cache"
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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-0.symbol-cache"
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