ghc-mod/Language/Haskell/GhcMod/Cradle.hs

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{-# LANGUAGE CPP #-}
module Language.Haskell.GhcMod.Cradle
#ifndef SPEC
(
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findCradle
, findCradle'
, findSpecCradle
, cleanupCradle
)
#endif
where
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import Language.Haskell.GhcMod.PathsAndFiles
import Language.Haskell.GhcMod.Monad.Types
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import Language.Haskell.GhcMod.Types
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import Language.Haskell.GhcMod.Utils
import Control.Applicative
import Control.Monad
import Control.Monad.Trans.Maybe
import Data.Maybe
import System.Directory
import System.FilePath
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import Prelude
----------------------------------------------------------------
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-- | Finding 'Cradle'.
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-- Find a cabal file by tracing ancestor directories.
-- Find a sandbox according to a cabal sandbox config
-- in a cabal directory.
findCradle :: (IOish m, GmOut m) => m Cradle
findCradle = findCradle' =<< liftIO getCurrentDirectory
findCradle' :: (IOish m, GmOut m) => FilePath -> m Cradle
findCradle' dir = run $
msum [ stackCradle dir
, cabalCradle dir
, sandboxCradle dir
, plainCradle dir
]
where run a = fillTempDir =<< (fromJust <$> runMaybeT a)
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findSpecCradle :: (IOish m, GmOut m) => FilePath -> m Cradle
findSpecCradle dir = do
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let cfs = [stackCradleSpec, cabalCradle, sandboxCradle]
cs <- catMaybes <$> mapM (runMaybeT . ($ dir)) cfs
gcs <- filterM isNotGmCradle cs
fillTempDir =<< case gcs of
[] -> fromJust <$> runMaybeT (plainCradle dir)
c:_ -> return c
where
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isNotGmCradle crdl =
liftIO $ not <$> doesFileExist (cradleRootDir crdl </> "ghc-mod.cabal")
cleanupCradle :: Cradle -> IO ()
cleanupCradle crdl = removeDirectoryRecursive $ cradleTempDir crdl
fillTempDir :: IOish m => Cradle -> m Cradle
fillTempDir crdl = do
tmpDir <- liftIO $ newTempDir (cradleRootDir crdl)
return crdl { cradleTempDir = tmpDir }
cabalCradle :: IOish m => FilePath -> MaybeT m Cradle
cabalCradle wdir = do
cabalFile <- MaybeT $ liftIO $ findCabalFile wdir
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let cabalDir = takeDirectory cabalFile
return Cradle {
cradleProject = CabalProject
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, cradleCurrentDir = wdir
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, cradleRootDir = cabalDir
, cradleTempDir = error "tmpDir"
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, cradleCabalFile = Just cabalFile
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, cradleDistDir = "dist"
}
stackCradle :: (IOish m, GmOut m) => FilePath -> MaybeT m Cradle
stackCradle wdir = do
cabalFile <- MaybeT $ liftIO $ findCabalFile wdir
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let cabalDir = takeDirectory cabalFile
_stackConfigFile <- MaybeT $ liftIO $ findStackConfigFile cabalDir
-- If dist/setup-config already exists the user probably wants to use cabal
-- rather than stack, or maybe that's just me ;)
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whenM (liftIO $ doesFileExist $ setupConfigPath "dist") $ mzero
senv <- MaybeT $ getStackEnv cabalDir
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return Cradle {
cradleProject = StackProject senv
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, cradleCurrentDir = wdir
, cradleRootDir = cabalDir
, cradleTempDir = error "tmpDir"
, cradleCabalFile = Just cabalFile
, cradleDistDir = seDistDir senv
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}
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stackCradleSpec :: (IOish m, GmOut m) => FilePath -> MaybeT m Cradle
stackCradleSpec wdir = do
crdl <- stackCradle wdir
case crdl of
Cradle { cradleProject = StackProject StackEnv { seDistDir } } -> do
b <- isGmDistDir seDistDir
when b mzero
return crdl
_ -> error "stackCradleSpec"
where
isGmDistDir dir =
liftIO $ not <$> doesFileExist (dir </> ".." </> "ghc-mod.cabal")
sandboxCradle :: IOish m => FilePath -> MaybeT m Cradle
sandboxCradle wdir = do
sbDir <- MaybeT $ liftIO $ findCabalSandboxDir wdir
return Cradle {
cradleProject = SandboxProject
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, cradleCurrentDir = wdir
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, cradleRootDir = sbDir
, cradleTempDir = error "tmpDir"
, cradleCabalFile = Nothing
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, cradleDistDir = "dist"
}
plainCradle :: IOish m => FilePath -> MaybeT m Cradle
plainCradle wdir = do
return $ Cradle {
cradleProject = PlainProject
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, cradleCurrentDir = wdir
, cradleRootDir = wdir
, cradleTempDir = error "tmpDir"
, cradleCabalFile = Nothing
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, cradleDistDir = "dist"
}