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module CabalDev (modifyOptions) where
{-
If the directory 'cabal-dev/packages-X.X.X.conf' exists, add it to the
options ghc-mod uses to check the source. Otherwise just pass it on.
-}
import Control.Applicative ((<$>))
import Control.Exception (throwIO)
import Control.Exception.IOChoice
import Data.List (find)
import System.Directory
import System.FilePath (splitPath,joinPath,(</>))
import Text.Regex.Posix ((=~))
import Types
modifyOptions :: Options -> IO Options
modifyOptions opts = found ||> notFound
where
found = addPath opts <$> findCabalDev (sandbox opts)
notFound = return opts
findCabalDev :: Maybe String -> IO FilePath
findCabalDev (Just path) = do
exist <- doesDirectoryExist path
if exist then
findConf path
else
findCabalDev Nothing
findCabalDev Nothing = getCurrentDirectory >>= searchIt . splitPath
addPath :: Options -> String -> Options
addPath orig_opts path = do
let orig_ghcopt = ghcOpts orig_opts
orig_opts { ghcOpts = orig_ghcopt ++ ["-package-conf", path, "-no-user-package-conf"] }
searchIt :: [FilePath] -> IO FilePath
searchIt [] = throwIO $ userError "Not found"
searchIt path = do
a <- doesDirectoryExist (mpath path)
if a then
findConf (mpath path)
else
searchIt $ init path
where
mpath a = joinPath a </> "cabal-dev/"
findConf :: FilePath -> IO FilePath
findConf path = do
Just f <- find (=~ "packages.*\\.conf") <$> getDirectoryContents path
return $ path </> f
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