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|
{-# OPTIONS -cpp #-}
----------------------------------------------------------------------
-- |
-- Module : UseIO
-- Maintainer : AR
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/08/08 09:01:25 $
-- > CVS $Author: peb $
-- > CVS $Revision: 1.17 $
--
-- (Description of the module)
-----------------------------------------------------------------------------
module GF.Infra.UseIO(module GF.Infra.UseIO,MonadIO(..),liftErr) where
import Prelude hiding (catch)
import GF.Data.Operations
import GF.Infra.Option
import GF.System.Catch
import Paths_gf(getDataDir)
import System.Directory
import System.FilePath
import System.IO
import System.IO.Error(isUserError,ioeGetErrorString)
import System.Environment
import System.Exit
import System.CPUTime
--import System.Cmd
import Text.Printf
import Control.Monad
import Control.Monad.Trans(MonadIO(..))
import Control.Exception(evaluate)
--putShow' :: Show a => (c -> a) -> c -> IO ()
--putShow' f = putStrLn . show . length . show . f
putIfVerb :: MonadIO io => Options -> String -> io ()
putIfVerb opts msg =
when (verbAtLeast opts Verbose) $ liftIO $ putStrLn msg
putIfVerbW :: MonadIO io => Options -> String -> io ()
putIfVerbW opts msg =
when (verbAtLeast opts Verbose) $ liftIO $ putStr (' ' : msg)
{-
errOptIO :: Options -> a -> Err a -> IO a
errOptIO os e m = case m of
Ok x -> return x
Bad k -> do
putIfVerb os k
return e
-}
type FileName = String
type InitPath = String
type FullPath = String
gfLibraryPath = "GF_LIB_PATH"
gfGrammarPathVar = "GF_GRAMMAR_PATH"
getLibraryDirectory :: MonadIO io => Options -> io FilePath
getLibraryDirectory opts =
case flag optGFLibPath opts of
Just path -> return path
Nothing -> liftIO $ catch (getEnv gfLibraryPath)
(\ex -> fmap (</> "lib") getDataDir)
getGrammarPath :: FilePath -> IO [FilePath]
getGrammarPath lib_dir = do
catch (fmap splitSearchPath $ getEnv gfGrammarPathVar)
(\_ -> return [lib_dir </> "alltenses",lib_dir </> "prelude"]) -- e.g. GF_GRAMMAR_PATH
-- | extends the search path with the
-- 'gfLibraryPath' and 'gfGrammarPathVar'
-- environment variables. Returns only existing paths.
extendPathEnv :: MonadIO io => Options -> io [FilePath]
extendPathEnv opts = liftIO $ do
let opt_path = flag optLibraryPath opts -- e.g. paths given as options
lib_dir <- getLibraryDirectory opts -- e.g. GF_LIB_PATH
grm_path <- getGrammarPath lib_dir -- e.g. GF_GRAMMAR_PATH
let paths = opt_path ++ [lib_dir] ++ grm_path
ps <- liftM concat $ mapM allSubdirs paths
mapM canonicalizePath ps
where
allSubdirs :: FilePath -> IO [FilePath]
allSubdirs [] = return [[]]
allSubdirs p = case last p of
'*' -> do let path = init p
fs <- getSubdirs path
return [path </> f | f <- fs]
_ -> do exists <- doesDirectoryExist p
if exists
then return [p]
else return []
getSubdirs :: FilePath -> IO [FilePath]
getSubdirs dir = do
fs <- catch (getDirectoryContents dir) (const $ return [])
foldM (\fs f -> do let fpath = dir </> f
p <- getPermissions fpath
if searchable p && not (take 1 f==".")
then return (fpath:fs)
else return fs ) [] fs
justModuleName :: FilePath -> String
justModuleName = dropExtension . takeFileName
splitInModuleSearchPath :: String -> [FilePath]
splitInModuleSearchPath s = case break isPathSep s of
(f,_:cs) -> f : splitInModuleSearchPath cs
(f,_) -> [f]
where
isPathSep :: Char -> Bool
isPathSep c = c == ':' || c == ';'
--
-- * IO monad with error; adapted from state monad
newtype IOE a = IOE { appIOE :: IO (Err a) }
ioe :: IO (Err a) -> IOE a
ioe = IOE
instance MonadIO IOE where liftIO io = ioe (io >>= return . return)
instance ErrorMonad IOE where
raise = ioe . return . Bad
handle m h = ioe $ err (appIOE . h) (return . Ok) =<< appIOE m
instance Functor IOE where fmap = liftM
instance Monad IOE where
return a = ioe (return (return a))
IOE c >>= f = IOE $ do
x <- c -- Err a
appIOE $ err raise f x -- f :: a -> IOE a
fail = raise
maybeIO io = either (const Nothing) Just `fmap` liftIO (try io)
useIOE :: a -> IOE a -> IO a
useIOE a ioe = appIOE ioe >>= err (\s -> putStrLn s >> return a) return
--foldIOE :: (a -> b -> IOE a) -> a -> [b] -> IOE (a, Maybe String)
foldIOE f s xs = case xs of
[] -> return (s,Nothing)
x:xx -> do
ev <- liftIO $ appIOE (f s x)
case ev of
Ok v -> foldIOE f v xx
Bad m -> return $ (s, Just m)
die :: String -> IO a
die s = do hPutStrLn stderr s
exitFailure
ePutStr, ePutStrLn, putStrE, putStrLnE :: MonadIO m => String -> m ()
ePutStr s = liftIO $ hPutStr stderr s
ePutStrLn s = liftIO $ hPutStrLn stderr s
putStrLnE s = liftIO $ putStrLn s >> hFlush stdout
putStrE s = liftIO $ putStr s >> hFlush stdout
putPointE :: MonadIO m => Verbosity -> Options -> String -> m a -> m a
putPointE v opts msg act = do
when (verbAtLeast opts v) $ putStrE msg
t1 <- liftIO $ getCPUTime
a <- act >>= liftIO . evaluate
t2 <- liftIO $ getCPUTime
if flag optShowCPUTime opts
then do let msec = (t2 - t1) `div` 1000000000
putStrLnE (printf " %5d msec" msec)
else when (verbAtLeast opts v) $ putStrLnE ""
return a
-- * File IO
writeUTF8File :: FilePath -> String -> IO ()
writeUTF8File fpath content =
withFile fpath WriteMode $ \ h -> do hSetEncoding h utf8
hPutStr h content
readBinaryFile path = hGetContents =<< openBinaryFile path ReadMode
writeBinaryFile path s = withBinaryFile path WriteMode (flip hPutStr s)
-- | Because GHC adds the confusing text "user error" for failures caused by
-- calls to fail.
ioErrorText e = if isUserError e
then ioeGetErrorString e
else show e
|
