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Show instance for Time #220

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8 changes: 6 additions & 2 deletions io-classes/si-timers/src/Control/Monad/Class/MonadTime/SI.hs
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Expand Up @@ -26,23 +26,27 @@ import Control.Monad.Class.MonadTime qualified as MonadTime

import NoThunks.Class (NoThunks (..))

import Data.Fixed (Pico, showFixed)
import Data.Time.Clock (DiffTime)
import Data.Time.Clock qualified as Time
import Data.Word (Word64)
import GHC.Generics (Generic (..))


-- | A point in time in a monotonic clock.
-- | A point in time in a monotonic clock counted in seconds.
--
-- The epoch for this clock is arbitrary and does not correspond to any wall
-- clock or calendar, and is /not guaranteed/ to be the same epoch across
-- program runs. It is represented as the 'DiffTime' from this arbitrary epoch.
--
newtype Time = Time DiffTime
deriving stock (Eq, Ord, Show, Generic)
deriving stock (Eq, Ord, Generic)
deriving newtype NFData
deriving anyclass NoThunks

instance Show Time where
show (Time t) = "Time " ++ showFixed True (realToFrac t :: Pico)

-- | The time duration between two points in time (positive or negative).
diffTime :: Time -> Time -> DiffTime
diffTime (Time t) (Time t') = t - t'
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