{-# LANGUAGE CPP #-} -- | Module for "pure" things in the base, and things I think should -- have been in base, or could plausibly be added. module General.Base(module General.Base, module X) where import Control.Arrow as X import Control.Monad as X import Data.Char as X import Data.Data as X (Data,Typeable) import Data.Either as X import Data.Function as X import Data.List as X import Data.Maybe as X import Data.Monoid as X import Data.Ord as X import Data.String as X import Data.Int as X import Data.Word as X import Debug.Trace as X (trace) import Numeric as X (readHex,showHex) import System.FilePath as X hiding (combine) import qualified Data.ByteString.Char8 as BS import qualified Data.ByteString.Lazy.Char8 as LBS import System.IO type LBString = LBS.ByteString type BString = BS.ByteString lbsUnpack = LBS.unpack bsUnpack = BS.unpack -- | A URL, or internet address. These addresses will usually start with either -- @http:\/\/@ or @file:\/\/@. type URL = String fst3 (a,b,c) = a snd3 (a,b,c) = b thd3 (a,b,c) = c swap (a,b) = (b,a) fromLeft (Left x) = x fromRight (Right x) = x isLeft Left{} = True; isLeft _ = False isRight Right{} = True; isRight _ = False concatMapM f = liftM concat . mapM f unzipEithers :: [Either a b] -> ([a],[b]) unzipEithers [] = ([],[]) unzipEithers (Left x:xs) = (x:a,b) where (a,b) = unzipEithers xs unzipEithers (Right x:xs) = (a,x:b) where (a,b) = unzipEithers xs initLast :: [a] -> ([a], a) initLast [] = error "initLast, empty list []" initLast [x] = ([], x) initLast (x:xs) = (x:a, b) where (a,b) = initLast xs lower = map toLower upper = map toUpper readFile' x = do src <- readFile x length src `seq` return src readFileUtf8' :: FilePath -> IO String readFileUtf8' x = do src <- readFileUtf8 x length src `seq` return src readFileUtf8 :: FilePath -> IO String #if __GLASGOW_HASKELL__ < 612 readFileUtf8 x = readFile x #else readFileUtf8 x = do h <- openFile x ReadMode hSetEncoding h utf8 hGetContents h #endif writeFileUtf8 :: FilePath -> String -> IO () #if __GLASGOW_HASKELL__ < 612 writeFileUtf8 x y = writeFile x y #else writeFileUtf8 x y = withFile x WriteMode $ \h -> do hSetEncoding h utf8 hPutStr h y #endif writeFileBinary :: FilePath -> String -> IO () writeFileBinary x y = withBinaryFile x WriteMode $ \h -> hPutStr h y ltrim = dropWhile isSpace rtrim = reverse . ltrim . reverse trim = ltrim . rtrim chop :: ([a] -> (b, [a])) -> [a] -> [b] chop _ [] = [] chop f as = b : chop f as' where (b, as') = f as fromList :: a -> [a] -> a fromList x [] = x fromList x (y:ys) = y