46 lines
1.3 KiB
Haskell
46 lines
1.3 KiB
Haskell
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 ((<$>))
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import Control.Exception (throwIO)
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import Control.Exception.IOChoice
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import Data.List (find)
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import System.Directory
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import System.FilePath (splitPath,joinPath,(</>))
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import Text.Regex.Posix ((=~))
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import Types
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modifyOptions :: Options -> IO Options
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modifyOptions opts = found ||> notFound
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where
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found = addPath opts <$> findCabalDev
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notFound = return opts
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findCabalDev :: IO String
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findCabalDev = 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 FilePath
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searchIt [] = throwIO $ userError "Not found"
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searchIt path = do
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a <- doesDirectoryExist (mpath path)
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if a then
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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 FilePath
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findConf path = do
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Just f <- find (=~ "packages.*\\.conf") <$> getDirectoryContents path
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return $ path </> f
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