diff options
Diffstat (limited to 'Utility/HumanTime.hs')
| -rw-r--r-- | Utility/HumanTime.hs | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/Utility/HumanTime.hs b/Utility/HumanTime.hs index 51338b3..5178531 100644 --- a/Utility/HumanTime.hs +++ b/Utility/HumanTime.hs @@ -44,8 +44,10 @@ daysToDuration :: Integer -> Duration daysToDuration i = Duration $ i * dsecs {- Parses a human-input time duration, of the form "5h", "1m", "5h1m", etc -} -parseDuration :: MonadFail m => String -> m Duration -parseDuration = maybe parsefail (return . Duration) . go 0 +parseDuration :: String -> Either String Duration +parseDuration d + | null d = parsefail + | otherwise = maybe parsefail (Right . Duration) $ go 0 d where go n [] = return n go n s = do @@ -55,7 +57,7 @@ parseDuration = maybe parsefail (return . Duration) . go 0 u <- M.lookup c unitmap go (n + num * u) rest _ -> return $ n + num - parsefail = fail "duration parse error; expected eg \"5m\" or \"1h5m\"" + parsefail = Left $ "failed to parse duration \"" ++ d ++ "\" (expected eg \"5m\" or \"1h5m\")" fromDuration :: Duration -> String fromDuration Duration { durationSeconds = d } @@ -101,4 +103,4 @@ instance Arbitrary Duration where arbitrary = Duration <$> nonNegative arbitrary prop_duration_roundtrips :: Duration -> Bool -prop_duration_roundtrips d = parseDuration (fromDuration d) == Just d +prop_duration_roundtrips d = parseDuration (fromDuration d) == Right d |