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

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-- ghc-mod: Making Haskell development *more* fun
-- Copyright (C) 2015 Daniel Gröber <dxld ÄT darkboxed DOT org>
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU Affero General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU Affero General Public License for more details.
--
-- You should have received a copy of the GNU Affero General Public License
-- along with this program. If not, see <http://www.gnu.org/licenses/>.
module Language.Haskell.GhcMod.CabalHelper (
CabalHelper(..)
, getComponents
, getGhcOptions
, getGhcPkgOptions
, cabalHelper
) where
import Control.Applicative
import Control.Arrow
import Control.Monad
import Data.Monoid
import Data.List
import Language.Haskell.GhcMod.Types
import Language.Haskell.GhcMod.Monad.Types
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import Language.Haskell.GhcMod.Error as E
import Language.Haskell.GhcMod.Utils
import Language.Haskell.GhcMod.World
import Language.Haskell.GhcMod.PathsAndFiles
import System.FilePath
-- | Only package related GHC options, sufficient for things that don't need to
-- access home modules
getGhcPkgOptions :: (MonadIO m, GmEnv m) => m [(GmComponentName, [GHCOption])]
getGhcPkgOptions = chGhcPkgOptions `liftM` cabalHelper
getGhcOptions :: (MonadIO m, GmEnv m) => m [(GmComponentName, [GHCOption])]
getGhcOptions = chGhcOptions `liftM` cabalHelper
-- | Primary interface to cabal-helper and intended single entrypoint to
-- constructing 'GmComponent's
--
-- The Component\'s 'gmcHomeModuleGraph' will be empty and has to be resolved by
-- 'resolveGmComponents'.
getComponents :: (MonadIO m, GmEnv m)
=> m [GmComponent (Either FilePath [ModuleName])]
getComponents = cabalHelper >>= \CabalHelper {..} -> return $ let
([(scn, sep)], eps) = partition ((GmSetupHsName ==) . fst) chEntrypoints
sc = GmComponent scn [] [] sep sep ["."] mempty
cs = flip map (zip4 eps chGhcOptions chGhcSrcOptions chSourceDirs) $
\((cn, ep), (_, opts), (_, srcOpts), (_, srcDirs)) ->
GmComponent cn opts srcOpts ep ep srcDirs mempty
in sc:cs
withCabal :: (MonadIO m, GmEnv m) => m a -> m a
withCabal action = do
crdl <- cradle
Options { cabalProgram } <- options
liftIO $ whenM (isSetupConfigOutOfDate <$> getCurrentWorld crdl) $
withDirectory_ (cradleRootDir crdl) $
void $ readProcess cabalProgram ["configure"] ""
action
data CabalHelper = CabalHelper {
chEntrypoints :: [(GmComponentName, Either FilePath [ModuleName])],
chSourceDirs :: [(GmComponentName, [String])],
chGhcOptions :: [(GmComponentName, [String])],
chGhcSrcOptions :: [(GmComponentName, [String])],
chGhcPkgOptions :: [(GmComponentName, [String])]
} deriving (Show)
cabalHelper :: (MonadIO m, GmEnv m) => m CabalHelper
cabalHelper = withCabal $ do
let cmds = [ "entrypoints"
, "source-dirs"
, "ghc-options"
, "ghc-src-options"
, "ghc-pkg-options" ]
Cradle {..} <- cradle
exe <- liftIO $ findLibexecExe "cabal-helper-wrapper"
let distdir = cradleRootDir </> "dist"
res <- liftIO $ cached cradleRootDir (cabalHelperCache cmds) $ do
out <- readProcess exe (distdir:cmds) ""
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evaluate (read out) `E.catch`
\(SomeException _) -> error "cabalHelper: read failed"
let [ Just (GmCabalHelperEntrypoints eps),
Just (GmCabalHelperStrings srcDirs),
Just (GmCabalHelperStrings ghcOpts),
Just (GmCabalHelperStrings ghcSrcOpts),
Just (GmCabalHelperStrings ghcPkgOpts) ] = res
eps' = map (second $ fmap $ map md) eps
return $ CabalHelper eps' srcDirs ghcOpts ghcSrcOpts ghcPkgOpts
where
md (GmModuleName mn) = mkModuleName mn