b22ed77fc4
Rather similar to crontab, although with a different format. But with less emphasis on per-minute scheduling. Also, supports weekly events, which cron makes too hard. Also, has a duration field.
138 lines
4 KiB
Haskell
138 lines
4 KiB
Haskell
{- misc utility functions
|
|
-
|
|
- Copyright 2010-2011 Joey Hess <joey@kitenet.net>
|
|
-
|
|
- Licensed under the GNU GPL version 3 or higher.
|
|
-}
|
|
|
|
{-# LANGUAGE CPP #-}
|
|
|
|
module Utility.Misc where
|
|
|
|
import System.IO
|
|
import Control.Monad
|
|
import Foreign
|
|
import Data.Char
|
|
import Data.List
|
|
import Control.Applicative
|
|
#ifndef mingw32_HOST_OS
|
|
import System.Posix.Process (getAnyProcessStatus)
|
|
import Utility.Exception
|
|
#endif
|
|
|
|
{- 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 item 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.)
|
|
- Segments may be empty. -}
|
|
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
|
|
|
|
prop_segment_regressionTest :: Bool
|
|
prop_segment_regressionTest = all id
|
|
-- Even an empty list is a segment.
|
|
[ segment (== "--") [] == [[]]
|
|
-- There are two segements in this list, even though the first is empty.
|
|
, segment (== "--") ["--", "foo", "bar"] == [[],["foo","bar"]]
|
|
]
|
|
|
|
{- Includes the delimiters as segments of their own. -}
|
|
segmentDelim :: (a -> Bool) -> [a] -> [[a]]
|
|
segmentDelim p l = map reverse $ go [] [] l
|
|
where
|
|
go c r [] = reverse $ c:r
|
|
go c r (i:is)
|
|
| p i = go [] ([i]:c:r) is
|
|
| otherwise = go (i:c) r is
|
|
|
|
{- Replaces multiple values in a string.
|
|
-
|
|
- Takes care to skip over just-replaced values, so that they are not
|
|
- mangled. For example, massReplace [("foo", "new foo")] does not
|
|
- replace the "new foo" with "new new foo".
|
|
-}
|
|
massReplace :: [(String, String)] -> String -> String
|
|
massReplace vs = go [] vs
|
|
where
|
|
|
|
go acc _ [] = concat $ reverse acc
|
|
go acc [] (c:cs) = go ([c]:acc) vs cs
|
|
go acc ((val, replacement):rest) s
|
|
| val `isPrefixOf` s =
|
|
go (replacement:acc) vs (drop (length val) s)
|
|
| otherwise = go acc rest s
|
|
|
|
{- Given two orderings, returns the second if the first is EQ and returns
|
|
- the first otherwise.
|
|
-
|
|
- Example use:
|
|
-
|
|
- compare lname1 lname2 `thenOrd` compare fname1 fname2
|
|
-}
|
|
thenOrd :: Ordering -> Ordering -> Ordering
|
|
thenOrd EQ x = x
|
|
thenOrd x _ = x
|
|
{-# INLINE thenOrd #-}
|
|
|
|
{- Wrapper around hGetBufSome that returns a String.
|
|
-
|
|
- The null string is returned on eof, otherwise returns whatever
|
|
- data is currently available to read from the handle, or waits for
|
|
- data to be written to it if none is currently available.
|
|
-
|
|
- Note on encodings: The normal encoding of the Handle is ignored;
|
|
- each byte is converted to a Char. Not unicode clean!
|
|
-}
|
|
hGetSomeString :: Handle -> Int -> IO String
|
|
hGetSomeString h sz = do
|
|
fp <- mallocForeignPtrBytes sz
|
|
len <- withForeignPtr fp $ \buf -> hGetBufSome h buf sz
|
|
map (chr . fromIntegral) <$> withForeignPtr fp (peekbytes len)
|
|
where
|
|
peekbytes :: Int -> Ptr Word8 -> IO [Word8]
|
|
peekbytes len buf = mapM (peekElemOff buf) [0..pred len]
|
|
|
|
{- Reaps any zombie git processes.
|
|
-
|
|
- Warning: Not thread safe. Anything that was expecting to wait
|
|
- on a process and get back an exit status is going to be confused
|
|
- if this reap gets there first. -}
|
|
reapZombies :: IO ()
|
|
#ifndef mingw32_HOST_OS
|
|
reapZombies = do
|
|
-- throws an exception when there are no child processes
|
|
catchDefaultIO Nothing (getAnyProcessStatus False True)
|
|
>>= maybe (return ()) (const reapZombies)
|
|
|
|
#else
|
|
reapZombies = return ()
|
|
#endif
|