84 lines
2.6 KiB
Haskell
84 lines
2.6 KiB
Haskell
{-# LANGUAGE FlexibleContexts #-}
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module Network.IRC.Util where
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import qualified Data.Text.Lazy as LzT
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import qualified Data.Text.Format as TF
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import ClassyPrelude
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import Control.Arrow (Arrow)
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import Control.Concurrent.Lifted (Chan)
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import Control.Monad.Base (MonadBase)
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import Data.Text (strip)
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import Data.Time (diffUTCTime)
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oneSec :: Int
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oneSec = 1000000
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type Latch = MVar ()
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latchIt :: Latch -> IO ()
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latchIt latch = putMVar latch ()
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awaitLatch :: Latch -> IO ()
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awaitLatch latch = void $ takeMVar latch
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type Channel a = (Chan a, Latch)
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mapKeys :: IsMap map => map -> [ContainerKey map]
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mapKeys = map fst . mapToList
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mapValues :: IsMap map => map -> [MapValue map]
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mapValues = map snd . mapToList
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whenJust :: Monad m => Maybe t -> (t -> m ()) -> m ()
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whenJust m f = maybe (return ()) f m
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clean :: Text -> Text
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clean = toLower . strip
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io :: MonadIO m => IO a -> m a
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io = liftIO
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both :: Arrow cat => cat b d -> cat (b, b) (d, d)
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both f = first f . second f
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atomicModIORef :: MonadBase IO f => IORef t -> (t -> t) -> f ()
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atomicModIORef ref f = void . atomicModifyIORef' ref $ \v -> (f v, v)
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-- | Display a time span as one time relative to another.
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relativeTime :: UTCTime -> UTCTime -> Text
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relativeTime t1 t2 =
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maybe "unknown" (LzT.toStrict . format) $ find (\(s,_,_) -> abs period >= s) ranges
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where
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minute = 60; hour = minute * 60; day = hour * 24;
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week = day * 7; month = day * 30; year = month * 12
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format range =
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(if period > 0 then "in " else "")
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++ case range of
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(_, str, 0) -> pack str
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(_, str, base) -> TF.format (fromString str) $ TF.Only (abs $ round (period / base) :: Integer)
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++ (if period <= 0 then " ago" else "")
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period = t1 `diffUTCTime` t2
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ranges = [(year*2, "{} years", year)
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,(year, "a year", 0)
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,(month*2, "{} months", month)
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,(month, "a month", 0)
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,(week*2, "{} weeks", week)
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,(week, "a week", 0)
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,(day*2, "{} days", day)
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,(day, "a day", 0)
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,(hour*4, "{} hours", hour)
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,(hour*3, "a few hours", 0)
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,(hour*2, "{} hours", hour)
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,(hour, "an hour", 0)
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,(minute*31, "{} minutes", minute)
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,(minute*30, "half an hour", 0)
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,(minute*2, "{} minutes", minute)
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,(minute, "a minute", 0)
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,(0, "{} seconds", 1)
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]
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