Merge branch 'with-ghcjs' into 'master'

Use Haskell on the frontend

See merge request guyonvarch/shared-cost!2

1 files changed, 26 insertions, 0 deletions

diff --git a/common/src/Common/Util/Time.hs b/common/src/Common/Util/Time.hs
new file mode 100644
index 0000000..6240720
--- /dev/null
+++ b/common/src/Common/Util/Time.hs
@@ -0,0 +1,26 @@
+module Common.Util.Time
+  ( timeToDay
+  , parseDay
+  ) where
+
+import           Data.Text           (Text)
+import qualified Data.Text           as T
+import           Data.Time           (UTCTime)
+import qualified Data.Time           as Time
+import           Data.Time.Calendar  (Day)
+import           Data.Time.LocalTime
+import qualified Text.Read           as T
+
+timeToDay :: UTCTime -> IO Day
+timeToDay time = localDay . (flip utcToLocalTime time) <$> getTimeZone time
+
+parseDay :: Text -> Maybe Day
+parseDay str = do
+  (y, m, d) <-
+    case T.splitOn "-" str of
+      [y, m, d] -> Just (y, m, d)
+      _         -> Nothing
+  d' <- T.readMaybe . T.unpack $ d
+  m' <- T.readMaybe . T.unpack $ m
+  y' <- T.readMaybe . T.unpack $ y
+  return $ Time.fromGregorian y' m' d'