ghc-mod-5.1.0.1: src/GHCMod.hs
{-# LANGUAGE DeriveDataTypeable #-}
module Main where
import Config (cProjectVersion)
import Control.Applicative ((<$>))
import Control.Exception (Exception, Handler(..), ErrorCall(..))
import CoreMonad (liftIO)
import qualified Control.Exception as E
import Data.Typeable (Typeable)
import Data.Version (showVersion)
import Language.Haskell.GhcMod
import Paths_ghc_mod
import System.Console.GetOpt (OptDescr(..), ArgDescr(..), ArgOrder(..))
import qualified System.Console.GetOpt as O
import System.Directory (doesFileExist)
import System.Environment (getArgs)
import System.Exit (exitFailure)
import System.IO (hPutStr, hPutStrLn, stdout, stderr, hSetEncoding, utf8)
----------------------------------------------------------------
progVersion :: String
progVersion = "ghc-mod version " ++ showVersion version ++ " compiled by GHC " ++ cProjectVersion ++ "\n"
ghcOptHelp :: String
ghcOptHelp = " [-g GHC_opt1 -g GHC_opt2 ...] "
usage :: String
usage = progVersion
++ "Usage:\n"
++ "\t ghc-mod list " ++ ghcOptHelp ++ "[-l] [-d]\n"
++ "\t ghc-mod lang [-l]\n"
++ "\t ghc-mod flag [-l]\n"
++ "\t ghc-mod browse " ++ ghcOptHelp ++ "[-l] [-o] [-d] [-q] [<package>:]<module> [[<package>:]<module> ...]\n"
++ "\t ghc-mod check " ++ ghcOptHelp ++ "<HaskellFiles...>\n"
++ "\t ghc-mod expand " ++ ghcOptHelp ++ "<HaskellFiles...>\n"
++ "\t ghc-mod debug " ++ ghcOptHelp ++ "\n"
++ "\t ghc-mod info " ++ ghcOptHelp ++ "<HaskellFile> <module> <expression>\n"
++ "\t ghc-mod type " ++ ghcOptHelp ++ "<HaskellFile> <module> <line-no> <column-no>\n"
++ "\t ghc-mod split " ++ ghcOptHelp ++ "<HaskellFile> <module> <line-no> <column-no>\n"
++ "\t ghc-mod sig " ++ ghcOptHelp ++ "<HaskellFile> <module> <line-no> <column-no>\n"
++ "\t ghc-mod refine " ++ ghcOptHelp ++ "<HaskellFile> <module> <line-no> <column-no> <expression>\n"
++ "\t ghc-mod auto " ++ ghcOptHelp ++ "<HaskellFile> <module> <line-no> <column-no>\n"
++ "\t ghc-mod find <symbol>\n"
++ "\t ghc-mod lint [-h opt] <HaskellFile>\n"
++ "\t ghc-mod root\n"
++ "\t ghc-mod doc <module>\n"
++ "\t ghc-mod boot\n"
++ "\t ghc-mod version\n"
++ "\t ghc-mod help\n"
++ "\n"
++ "<module> for \"info\" and \"type\" is not used, anything is OK.\n"
++ "It is necessary to maintain backward compatibility.\n"
----------------------------------------------------------------
argspec :: [OptDescr (Options -> Options)]
argspec =
let option s l udsc dsc = Option s l dsc udsc
reqArg udsc dsc = ReqArg dsc udsc
in
[ option "l" ["tolisp"] "print as a list of Lisp" $
NoArg $ \o -> o { outputStyle = LispStyle }
, option "h" ["hlintOpt"] "hlint options" $
reqArg "hlintOpt" $ \h o -> o { hlintOpts = h : hlintOpts o }
, option "g" ["ghcOpt"] "GHC options" $
reqArg "ghcOpt" $ \g o ->
o { ghcUserOptions = g : ghcUserOptions o }
, option "v" ["verbose"] "verbose" $
NoArg $ \o -> o { ghcUserOptions = "-v" : ghcUserOptions o }
, option "o" ["operators"] "print operators, too" $
NoArg $ \o -> o { operators = True }
, option "d" ["detailed"] "print detailed info" $
NoArg $ \o -> o { detailed = True }
, option "q" ["qualified"] "show qualified names" $
NoArg $ \o -> o { qualified = True }
, option "b" ["boundary"] "specify line separator (default is Nul string)"$
reqArg "sep" $ \s o -> o { lineSeparator = LineSeparator s }
]
parseArgs :: [OptDescr (Options -> Options)] -> [String] -> (Options, [String])
parseArgs spec argv
= case O.getOpt Permute spec argv of
(o,n,[] ) -> (foldr id defaultOptions o, n)
(_,_,errs) -> E.throw (CmdArg errs)
----------------------------------------------------------------
data GHCModError = SafeList
| ArgumentsMismatch String
| NoSuchCommand String
| CmdArg [String]
| FileNotExist String deriving (Show, Typeable)
instance Exception GHCModError
----------------------------------------------------------------
main :: IO ()
main = flip E.catches handlers $ do
hSetEncoding stdout utf8
args <- getArgs
let (opt,cmdArg) = parseArgs argspec args
let cmdArg0 = cmdArg !. 0
cmdArg1 = cmdArg !. 1
cmdArg3 = cmdArg !. 3
cmdArg4 = cmdArg !. 4
cmdArg5 = cmdArg !. 5
remainingArgs = tail cmdArg
nArgs :: Int -> a -> a
nArgs n f = if length remainingArgs == n
then f
else E.throw (ArgumentsMismatch cmdArg0)
(res, _) <- runGhcModT opt $ case cmdArg0 of
"list" -> modules
"lang" -> languages
"flag" -> flags
"browse" -> concat <$> mapM browse remainingArgs
"check" -> checkSyntax remainingArgs
"expand" -> expandTemplate remainingArgs
"debug" -> debugInfo
"info" -> nArgs 3 info cmdArg1 cmdArg3
"type" -> nArgs 4 $ types cmdArg1 (read cmdArg3) (read cmdArg4)
"split" -> nArgs 4 $ splits cmdArg1 (read cmdArg3) (read cmdArg4)
"sig" -> nArgs 4 $ sig cmdArg1 (read cmdArg3) (read cmdArg4)
"refine" -> nArgs 5 $ refine cmdArg1 (read cmdArg3) (read cmdArg4) cmdArg5
"auto" -> nArgs 4 $ auto cmdArg1 (read cmdArg3) (read cmdArg4)
"find" -> nArgs 1 $ findSymbol cmdArg1
"lint" -> nArgs 1 $ withFile lint cmdArg1
"root" -> rootInfo
"doc" -> nArgs 1 $ pkgDoc cmdArg1
"dumpsym" -> dumpSymbol
"boot" -> boot
"version" -> return progVersion
"help" -> return $ O.usageInfo usage argspec
cmd -> E.throw (NoSuchCommand cmd)
case res of
Right s -> putStr s
Left (GMENoMsg) ->
hPutStrLn stderr "Unknown error"
Left (GMEString msg) ->
hPutStrLn stderr msg
Left (GMECabalConfigure msg) ->
hPutStrLn stderr $ "cabal configure failed: " ++ show msg
Left (GMECabalFlags msg) ->
hPutStrLn stderr $ "retrieval of the cabal configuration flags failed: " ++ show msg
Left (GMEProcess cmd msg) ->
hPutStrLn stderr $
"launching operating system process `"++c++"` failed: " ++ show msg
where c = unwords cmd
where
handlers = [Handler (handleThenExit handler1), Handler (handleThenExit handler2)]
handleThenExit handler e = handler e >> exitFailure
handler1 :: ErrorCall -> IO ()
handler1 = print -- for debug
handler2 :: GHCModError -> IO ()
handler2 SafeList = printUsage
handler2 (ArgumentsMismatch cmd) = do
hPutStrLn stderr $ "\"" ++ cmd ++ "\": Arguments did not match"
printUsage
handler2 (NoSuchCommand cmd) = do
hPutStrLn stderr $ "\"" ++ cmd ++ "\" not supported"
printUsage
handler2 (CmdArg errs) = do
mapM_ (hPutStr stderr) errs
printUsage
handler2 (FileNotExist file) = do
hPutStrLn stderr $ "\"" ++ file ++ "\" not found"
printUsage
printUsage = hPutStrLn stderr $ '\n' : O.usageInfo usage argspec
withFile :: IOish m => (FilePath -> GhcModT m a) -> FilePath -> GhcModT m a
withFile cmd file = do
exist <- liftIO $ doesFileExist file
if exist
then cmd file
else E.throw (FileNotExist file)
xs !. idx
| length xs <= idx = E.throw SafeList
| otherwise = xs !! idx