{-# LANGUAGE CPP #-}
module Foreign.Hoppy.Generator.Main (
Action (..),
defaultMain,
defaultMain',
run,
) where
#if !MIN_VERSION_base(4,8,0)
import Control.Applicative ((<$>))
#endif
import Control.Arrow ((&&&))
import Control.Concurrent.MVar (MVar, modifyMVar, modifyMVar_, newMVar, readMVar)
import Control.Monad ((<=<), forM, unless, when)
import Data.Foldable (forM_)
import Data.List (intercalate)
import qualified Data.Map as M
import Data.Map (Map)
import Data.Maybe (fromMaybe)
import Foreign.Hoppy.Generator.Common (writeFileIfDifferent)
import qualified Foreign.Hoppy.Generator.Language.Cpp.Internal as Cpp
import qualified Foreign.Hoppy.Generator.Language.Haskell.Internal as Haskell
import Foreign.Hoppy.Generator.Spec
import System.Directory (createDirectoryIfMissing, doesDirectoryExist)
import System.Environment (getArgs)
import System.Exit (exitFailure, exitSuccess)
import System.FilePath ((</>), takeDirectory)
import System.IO (hPutStrLn, stderr)
data Action =
SelectInterface String
| ListInterfaces
| ListCppFiles
| ListHsFiles
| GenCpp FilePath
| GenHaskell FilePath
data AppState = AppState
{ appInterfaces :: Map String Interface
, appCurrentInterface :: Interface
, appCaches :: Caches
}
initialAppState :: [Interface] -> AppState
initialAppState ifaces = AppState
{ appInterfaces = M.fromList $ map (interfaceName &&& id) ifaces
, appCurrentInterface = head ifaces
, appCaches = M.empty
}
type Caches = Map String InterfaceCache
data InterfaceCache = InterfaceCache
{ cacheInterface :: Interface
, generatedCpp :: Maybe Cpp.Generation
, generatedHaskell :: Maybe Haskell.Generation
}
emptyCache :: Interface -> InterfaceCache
emptyCache iface = InterfaceCache iface Nothing Nothing
getGeneratedCpp :: InterfaceCache -> IO (InterfaceCache, Either String Cpp.Generation)
getGeneratedCpp cache = case generatedCpp cache of
Just gen -> return (cache, Right gen)
_ -> case Cpp.generate $ cacheInterface cache of
l@(Left _) -> return (cache, l)
r@(Right gen) -> return (cache { generatedCpp = Just gen }, r)
getGeneratedHaskell :: InterfaceCache -> IO (InterfaceCache, Either String Haskell.Generation)
getGeneratedHaskell cache = case generatedHaskell cache of
Just gen -> return (cache, Right gen)
_ -> case Haskell.generate $ cacheInterface cache of
l@(Left _) -> return (cache, l)
r@(Right gen) -> return (cache { generatedHaskell = Just gen }, r)
defaultMain :: Either String Interface -> IO ()
defaultMain interfaceResult = defaultMain' [interfaceResult]
defaultMain' :: [Either String Interface] -> IO ()
defaultMain' interfaceResults = do
interfaces <- forM interfaceResults $ \interfaceResult -> case interfaceResult of
Left errorMsg -> do
hPutStrLn stderr $ "Error initializing interface: " ++ errorMsg
exitFailure
Right iface -> return iface
args <- getArgs
_ <- run interfaces args
return ()
run :: [Interface] -> [String] -> IO [Action]
run interfaces args = do
stateVar <- newMVar $ initialAppState interfaces
when (null args) $ do
putStrLn "This is a Hoppy interface generator. Use --help for options."
putStrLn ""
putStrLn $ "Interfaces: " ++ unwords (map interfaceName interfaces)
exitSuccess
when ("--help" `elem` args) $ usage stateVar >> exitSuccess
processArgs stateVar args
usage :: MVar AppState -> IO ()
usage stateVar = do
interfaceNames <- map interfaceName <$> getInterfaces stateVar
mapM_ putStrLn
[ "Hoppy binding generator"
, ""
, "Interfaces: " ++ intercalate ", " interfaceNames
, ""
, "Supported options:"
, " --help Displays this menu."
, " --interface <iface> Sets the interface used for subsequent options."
, " --list-interfaces Lists the interfaces compiled into this binary."
, " --list-cpp-files Lists generated file paths in C++ bindings."
, " --list-hs-files Lists generated file paths in Haskell bindings."
, " --gen-cpp <outdir> Generate C++ bindings in a directory."
, " --gen-hs <outdir> Generate Haskell bindings under the given"
, " top-level source directory."
]
processArgs :: MVar AppState -> [String] -> IO [Action]
processArgs stateVar args =
case args of
[] -> return []
"--interface":name:rest -> do
modifyMVar_ stateVar $ \state ->
case M.lookup name $ appInterfaces state of
Nothing -> do
hPutStrLn stderr $
"--interface: Interface '" ++ name ++ "' doesn't exist in this generator."
_ <- exitFailure
return state
Just iface -> return state { appCurrentInterface = iface }
(SelectInterface name:) <$> processArgs stateVar rest
"--list-interfaces":rest -> do
listInterfaces stateVar
(ListInterfaces:) <$> processArgs stateVar rest
"--list-cpp-files":rest -> do
genResult <- withCurrentCache stateVar getGeneratedCpp
case genResult of
Left errorMsg -> do
hPutStrLn stderr $ "--list-cpp-files: Failed to generate: " ++ errorMsg
exitFailure
Right gen -> do
mapM_ putStrLn $ M.keys $ Cpp.generatedFiles gen
(ListCppFiles:) <$> processArgs stateVar rest
"--list-hs-files":rest -> do
genResult <- withCurrentCache stateVar getGeneratedHaskell
case genResult of
Left errorMsg -> do
hPutStrLn stderr $ "--list-hs-files: Failed to generate: " ++ errorMsg
exitFailure
Right gen -> do
mapM_ putStrLn $ M.keys $ Haskell.generatedFiles gen
(ListHsFiles:) <$> processArgs stateVar rest
"--gen-cpp":baseDir:rest -> do
baseDirExists <- doesDirectoryExist baseDir
unless baseDirExists $ do
hPutStrLn stderr $
"--gen-cpp: Please create this directory so that I can generate files in it: " ++
baseDir
exitFailure
genResult <- withCurrentCache stateVar getGeneratedCpp
case genResult of
Left errorMsg -> do
hPutStrLn stderr $ "--gen-cpp: Failed to generate: " ++ errorMsg
exitFailure
Right gen -> do
forM_ (M.toList $ Cpp.generatedFiles gen) $
uncurry $ writeGeneratedFile baseDir
(GenCpp baseDir:) <$> processArgs stateVar rest
"--gen-hs":baseDir:rest -> do
baseDirExists <- doesDirectoryExist baseDir
unless baseDirExists $ do
hPutStrLn stderr $
"--gen-hs: Please create this directory so that I can generate files in it: " ++
baseDir
exitFailure
genResult <- withCurrentCache stateVar getGeneratedHaskell
case genResult of
Left errorMsg -> do
hPutStrLn stderr $ "--gen-hs: Failed to generate: " ++ errorMsg
exitFailure
Right gen -> do
forM_ (M.toList $ Haskell.generatedFiles gen) $
uncurry $ writeGeneratedFile baseDir
(GenHaskell baseDir:) <$> processArgs stateVar rest
arg:_ -> do
hPutStrLn stderr $ "Invalid option or missing argument for '" ++ arg ++ "'."
exitFailure
writeGeneratedFile :: FilePath -> FilePath -> String -> IO ()
writeGeneratedFile baseDir subpath contents = do
let path = baseDir </> subpath
createDirectoryIfMissing True $ takeDirectory path
writeFileIfDifferent path contents
withCurrentCache :: MVar AppState -> (InterfaceCache -> IO (InterfaceCache, a)) -> IO a
withCurrentCache stateVar fn = modifyMVar stateVar $ \state -> do
let currentInterface = appCurrentInterface state
name = interfaceName currentInterface
(cache, result) <- fn $
fromMaybe (emptyCache currentInterface) $
M.lookup name $
appCaches state
return (state { appCaches = M.insert name cache $ appCaches state }, result)
listInterfaces :: MVar AppState -> IO ()
listInterfaces = mapM_ (putStrLn . interfaceName) <=< getInterfaces
getInterfaces :: MVar AppState -> IO [Interface]
getInterfaces = fmap (M.elems . appInterfaces) . readMVar