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{-# LANGUAGE DeriveFoldable #-}
module Util (module Util, toList) where
import Data.Foldable (toList)
import Data.Maybe (fromMaybe)
import Data.Time (Day, toGregorian)
import Data.Word (Word8)
data Snoc a = SnocNil | Snoc (Snoc a) a
deriving (Show, Foldable)
-- | Time-of-day, in unspecified time zone
data YMDHMS = YMDHMS {-# UNPACK #-} !YMD
{-# UNPACK #-} !HMS
deriving (Show)
-- | Calendar day
data YMD = YMD {-# UNPACK #-} !Int
{-# UNPACK #-} !Word8 -- ^ 1-based
{-# UNPACK #-} !Word8
deriving (Show, Eq, Ord)
-- | Time-of-day in seconds, in unspecified time zone
data HMS = HMS {-# UNPACK #-} !Word8
{-# UNPACK #-} !Word8
{-# UNPACK #-} !Word8
deriving (Show)
pad :: Show a => Char -> Int -> a -> String
pad c w val =
let s = show val
in replicate (w - length s) c ++ s
uncurry3 :: (a -> b -> c -> d) -> (a, b, c) -> d
uncurry3 f (x, y, z) = f x y z
dropWhileEnd :: (a -> Bool) -> [a] -> [a]
dropWhileEnd p = fromMaybe [] . go
where
go [] = Nothing
go (x:xs) =
case go xs of
Nothing | p x -> Nothing
| otherwise -> Just [x]
Just xs' -> Just (x : xs')
ymdToString :: YMD -> String
ymdToString (YMD y m d) = pad '0' 4 y ++ '-' : pad '0' 2 m ++ '-' : pad '0' 2 d
dayToYMD :: Day -> YMD
dayToYMD day =
let (y, m, d) = toGregorian day
in YMD (fromIntegral y) (fromIntegral m) (fromIntegral d)
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