50 lines
1.3 KiB
Haskell
50 lines
1.3 KiB
Haskell
{-# LANGUAGE DoAndIfThenElse #-}
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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 Control.Applicative ((<$>))
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import Data.List (find)
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import System.FilePath (splitPath,joinPath,(</>))
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import System.Directory
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import Text.Regex.Posix ((=~))
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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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getCurrentDirectory >>= 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_ghcopt = ghcOpts orig_opts
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orig_opts { ghcOpts = orig_ghcopt ++ ["-package-conf", 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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if a then do
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findConf (mpath path)
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else
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searchIt $ init path
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where
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mpath a = joinPath a </> "cabal-dev/"
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findConf :: FilePath -> IO (Maybe FilePath)
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findConf path = do
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f <- find (=~ "packages.*\\.conf") <$> getDirectoryContents path
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return $ ((path </>) <$> f)
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