46 lines
1.2 KiB
Haskell
46 lines
1.2 KiB
Haskell
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module CabalDev (modifyOptions) where
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{-
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If the directory 'cabal-dev/packages-X.X.X.conf' exists, add it to the
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options ghc-mod uses to check the source. Otherwise just pass it on.
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-}
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import Data.Maybe (listToMaybe)
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import System.FilePath.Find
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import System.FilePath.Posix (splitPath,joinPath)
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import System.Posix.Directory (getWorkingDirectory)
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import System.Directory
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import Types
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modifyOptions :: Options -> IO Options
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modifyOptions opts =
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fmap (has_cdev opts) findCabalDev
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where
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has_cdev :: Options -> Maybe String -> Options
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has_cdev op Nothing = op
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has_cdev op (Just path) = addPath op path
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findCabalDev :: IO (Maybe String)
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findCabalDev =
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getWorkingDirectory >>= searchIt . splitPath
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addPath :: Options -> String -> Options
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addPath orig_opts path = do
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let orig_paths = packageConfs orig_opts
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orig_opts {
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packageConfs = orig_paths ++ [path] }
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searchIt :: [FilePath] -> IO (Maybe FilePath)
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searchIt [] = return Nothing
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searchIt path = do
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a <- doesDirectoryExist (mpath path)
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case a of
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False -> return Nothing
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True -> do
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b <- find always (fileName ~~? "packages*.conf") $ mpath path
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maybe (searchIt $ init path) (return . Just) $ listToMaybe b
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where
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mpath a = (joinPath a) ++ "cabal-dev/"
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