47 lines
1.3 KiB
Haskell
47 lines
1.3 KiB
Haskell
{- misc utility functions
|
|
-
|
|
- Copyright 2010-2011 Joey Hess <joey@kitenet.net>
|
|
-
|
|
- Licensed under the GNU GPL version 3 or higher.
|
|
-}
|
|
|
|
module Utility.Misc where
|
|
|
|
import System.IO
|
|
import Control.Monad
|
|
|
|
{- A version of hgetContents that is not lazy. Ensures file is
|
|
- all read before it gets closed. -}
|
|
hGetContentsStrict :: Handle -> IO String
|
|
hGetContentsStrict = hGetContents >=> \s -> length s `seq` return s
|
|
|
|
{- A version of readFile that is not lazy. -}
|
|
readFileStrict :: FilePath -> IO String
|
|
readFileStrict = readFile >=> \s -> length s `seq` return s
|
|
|
|
{- Like break, but the character matching the condition is not included
|
|
- in the second result list.
|
|
-
|
|
- separate (== ':') "foo:bar" = ("foo", "bar")
|
|
- separate (== ':') "foobar" = ("foobar", "")
|
|
-}
|
|
separate :: (a -> Bool) -> [a] -> ([a], [a])
|
|
separate c l = unbreak $ break c l
|
|
where
|
|
unbreak r@(a, b)
|
|
| null b = r
|
|
| otherwise = (a, tail b)
|
|
|
|
{- Breaks out the first line. -}
|
|
firstLine :: String -> String
|
|
firstLine = takeWhile (/= '\n')
|
|
|
|
{- Splits a list into segments that are delimited by items matching
|
|
- a predicate. (The delimiters are not included in the segments.) -}
|
|
segment :: (a -> Bool) -> [a] -> [[a]]
|
|
segment p l = map reverse $ go [] [] l
|
|
where
|
|
go c r [] = reverse $ c:r
|
|
go c r (i:is)
|
|
| p i = go [] (c:r) is
|
|
| otherwise = go (i:c) r is
|