ghc-mod-4.0.2: src/GHCModi.hs
{-# LANGUAGE CPP #-}
{-# LANGUAGE DeriveDataTypeable #-}
-- Commands:
-- check <file>
-- find <symbol>
-- lint [hlint options] <file>
-- the format of hlint options is [String] because they may contain
-- spaces and aslo <file> may contain spaces.
--
-- Session separators:
-- OK -- success
-- NG -- failure
module Main where
#ifndef MIN_VERSION_containers
#define MIN_VERSION_containers(x,y,z) 1
#endif
import Control.Applicative ((<$>))
import Control.Concurrent (forkIO, MVar, newEmptyMVar, putMVar, readMVar)
import Control.Exception (SomeException(..))
import qualified Control.Exception as E
import Control.Monad (when, void)
import CoreMonad (liftIO)
import Data.Function (on)
import Data.List (intercalate, groupBy, sort, find)
#if MIN_VERSION_containers(0,5,0)
import Data.Map.Strict (Map)
import qualified Data.Map.Strict as M
#else
import Data.Map (Map)
import qualified Data.Map as M
#endif
import Data.Maybe (fromMaybe)
import Data.Set (Set)
import qualified Data.Set as S
import Data.Typeable
import Data.Version (showVersion)
import qualified Exception as GE
import GHC (Ghc, LoadHowMuch(LoadAllTargets), TargetId(TargetFile))
import qualified GHC as G
import HscTypes (SourceError)
import Language.Haskell.GhcMod
import Language.Haskell.GhcMod.Internal
import Paths_ghc_mod
import System.Console.GetOpt
import System.Directory (setCurrentDirectory)
import System.Environment (getArgs)
import System.IO (hFlush,stdout)
----------------------------------------------------------------
type DB = Map String [String]
type Logger = IO [String]
----------------------------------------------------------------
argspec :: [OptDescr (Options -> Options)]
argspec = [ Option "b" ["boundary"]
(ReqArg (\s opts -> opts { lineSeparator = LineSeparator s }) "sep")
"specify line separator (default is Nul string)"
]
usage :: String
usage = "ghc-modi version " ++ showVersion version ++ "\n"
++ "Usage:\n"
++ "\t ghc-modi [-b sep]\n"
++ "\t ghc-modi help\n"
parseArgs :: [OptDescr (Options -> Options)] -> [String] -> (Options, [String])
parseArgs spec argv
= case getOpt Permute spec argv of
(o,n,[] ) -> (foldr id defaultOptions o, n)
(_,_,errs) -> GE.throw (CmdArg errs)
----------------------------------------------------------------
data GHCModiError = CmdArg [String]
deriving (Show, Typeable)
instance GE.Exception GHCModiError
----------------------------------------------------------------
-- Running two GHC monad threads disables the handling of
-- C-c since installSignalHandlers is called twice, sigh.
main :: IO ()
main = handle [GE.Handler cmdHandler, GE.Handler someHandler] $
go =<< parseArgs argspec <$> getArgs
where
handle = flip GE.catches
LineSeparator lsc = lineSeparator defaultOptions
cmdHandler (CmdArg e) = do
putStr "ghc-modi:0:0:"
let x = intercalate lsc e
putStrLn x
putStr $ usageInfo usage argspec
putStrLn "NG"
someHandler (SomeException e) = do
putStr "ghc-modi:0:0:"
let x = intercalate lsc $ lines $ show e
putStrLn x
putStrLn "NG"
go (_,"help":_) = do
putStr $ usageInfo usage argspec
putStrLn "NG"
go (opt,_) = do
cradle0 <- findCradle
let rootdir = cradleRootDir cradle0
cradle = cradle0 { cradleCurrentDir = rootdir }
ls = lineSeparator opt
setCurrentDirectory rootdir
mvar <- liftIO newEmptyMVar
mlibdir <- getSystemLibDir
void $ forkIO $ setupDB cradle mlibdir opt mvar
run cradle mlibdir opt $ loop S.empty ls mvar
----------------------------------------------------------------
run :: Cradle -> Maybe FilePath -> Options -> (Logger -> Ghc a) -> IO a
run cradle mlibdir opt body = G.runGhc mlibdir $ do
(readLog,_) <- initializeFlagsWithCradle opt cradle ["-Wall"] True
dflags <- G.getSessionDynFlags
G.defaultCleanupHandler dflags $ body readLog
----------------------------------------------------------------
setupDB :: Cradle -> Maybe FilePath -> Options -> MVar DB -> IO ()
setupDB cradle mlibdir opt mvar = E.handle handler $ do
sm <- run cradle mlibdir opt $ \_ -> G.getSessionDynFlags >>= browseAll
let sms = map tieup $ groupBy ((==) `on` fst) $ sort sm
m = M.fromList sms
putMVar mvar m
where
tieup x = (head (map fst x), map snd x)
handler (SomeException _) = return ()
----------------------------------------------------------------
loop :: Set FilePath -> LineSeparator -> MVar DB -> Logger -> Ghc ()
loop set ls mvar readLog = do
cmdArg <- liftIO getLine
let (cmd,arg') = break (== ' ') cmdArg
arg = dropWhile (== ' ') arg'
(msgs,ok,set') <- case cmd of
"check" -> checkStx set ls readLog arg
"find" -> findSym set mvar arg
"lint" -> lintStx set ls arg
_ -> return ([], False, set)
mapM_ (liftIO . putStrLn) msgs
liftIO $ putStrLn $ if ok then "OK" else "NG"
liftIO $ hFlush stdout
when ok $ loop set' ls mvar readLog
----------------------------------------------------------------
checkStx :: Set FilePath
-> LineSeparator
-> Logger
-> FilePath
-> Ghc ([String], Bool, Set FilePath)
checkStx set ls readLog file = do
let add = not $ S.member file set
GE.ghandle handler $ do
mdel <- removeMainTarget
when add $ addTargetFiles [file]
void $ G.load LoadAllTargets
msgs <- liftIO readLog
let set1 = if add then S.insert file set else set
set2 = case mdel of
Nothing -> set1
Just delfl -> S.delete delfl set1
return (msgs, True, set2)
where
handler :: SourceError -> Ghc ([String], Bool, Set FilePath)
handler err = do
errmsgs <- handleErrMsg ls err
return (errmsgs, False, set)
removeMainTarget = do
mx <- find isMain <$> G.getModuleGraph
case mx of
Nothing -> return Nothing
Just x -> do
let mmainfile = G.ml_hs_file (G.ms_location x)
-- G.ms_hspp_file x is a temporary file with CPP.
-- this is a just fake.
mainfile = fromMaybe (G.ms_hspp_file x) mmainfile
if mainfile == file then
return Nothing
else do
let target = TargetFile mainfile Nothing
G.removeTarget target
return $ Just mainfile
isMain m = G.moduleNameString (G.moduleName (G.ms_mod m)) == "Main"
findSym :: Set FilePath -> MVar DB -> String
-> Ghc ([String], Bool, Set FilePath)
findSym set mvar sym = do
db <- liftIO $ readMVar mvar
let ret = fromMaybe [] (M.lookup sym db)
return (ret, True, set)
lintStx :: Set FilePath -> LineSeparator -> FilePath
-> Ghc ([String], Bool, Set FilePath)
lintStx set (LineSeparator lsep) optFile = liftIO $ E.handle handler $ do
msgs <- map (intercalate lsep . lines) <$> lint hopts file
return (msgs, True, set)
where
(opt,file) = parseLintOptions optFile
hopts = if opt == "" then [] else read opt
-- let's continue the session
handler (SomeException e) = do
print e
return ([], True, set)
-- |
-- >>> parseLintOptions "[\"--ignore=Use camelCase\", \"--ignore=Eta reduce\"] file name"
-- (["--ignore=Use camelCase", "--ignore=Eta reduce"], "file name")
-- >>> parseLintOptions "file name"
-- ([], "file name")
parseLintOptions :: String -> (String, String)
parseLintOptions optFile = case brk (== ']') (dropWhile (/= '[') optFile) of
("","") -> ([], optFile)
(opt',file') -> (opt', dropWhile (== ' ') file')
where
brk _ [] = ([],[])
brk p (x:xs')
| p x = ([x],xs')
| otherwise = let (ys,zs) = brk p xs' in (x:ys,zs)