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Fix genDate generator frequency #83

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Merged
thomashoneyman merged 1 commit into from
Dec 18, 2020
Merged

Fix genDate generator frequency #83

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16 changes: 13 additions & 3 deletions src/Data/Date/Gen.purs
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Expand Up @@ -4,11 +4,21 @@ module Data.Date.Gen
) where

import Prelude
import Control.Monad.Gen (class MonadGen)
import Data.Date (Date, canonicalDate)
import Control.Monad.Gen (class MonadGen, chooseInt)
import Data.Date (Date, adjust, exactDate, isLeapYear)
import Data.Date.Component.Gen (genDay, genMonth, genWeekday, genYear)
import Data.Int (toNumber)
import Data.Maybe (fromJust)
import Data.Time.Duration (Days(..))
import Partial.Unsafe (unsafePartial)

-- | Generates a random `Date` between 1st Jan 1900 and 31st Dec 2100,
-- | inclusive.
genDate :: forall m. MonadGen m => m Date
genDate = canonicalDate <$> genYear <*> genMonth <*> genDay
genDate = do
year <- genYear
let maxDays = if isLeapYear year then 365 else 364
days <- Days <<< toNumber <$> chooseInt 0 maxDays
pure $ unsafePartial $ fromJust do
janFirst <- exactDate year bottom bottom
adjust days janFirst