7cae6c746c
This sped up git annex find --not --in web from 6.64s to 5.69s. The optimised parser is probably more like 50% faster than the general one it replaced.
39 lines
940 B
Haskell
39 lines
940 B
Haskell
{- log timestamp parsing
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-
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- Copyright 2015-2016 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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{-# LANGUAGE CPP #-}
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module Logs.TimeStamp where
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import Utility.PartialPrelude
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import Utility.Misc
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import Data.Time.Clock.POSIX
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import Data.Time
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import Data.Ratio
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#if ! MIN_VERSION_time(1,5,0)
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import System.Locale
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#endif
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{- Parses how POSIXTime shows itself: "1431286201.113452s"
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- Also handles the format with no fractional seconds. -}
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parsePOSIXTime :: String -> Maybe POSIXTime
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parsePOSIXTime s = do
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let (sn, sd) = separate (== '.') s
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n <- readi sn
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if null sd
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then return (fromIntegral n)
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else do
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d <- readi sd
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let r = d % (10 ^ (length sd - 1))
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return (fromIntegral n + fromRational r)
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where
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readi :: String -> Maybe Integer
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readi = readish
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formatPOSIXTime :: String -> POSIXTime -> String
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formatPOSIXTime fmt t = formatTime defaultTimeLocale fmt (posixSecondsToUTCTime t)
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