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lib: fix ghc 8-related date issues (#352)

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Our null date is now 0000/01/01 instead of 0000/00/00.
This commit is contained in:
Simon Michael 2016-05-27 08:06:53 -07:00
parent f3bf98bfae
commit ad3c5dfb4d
1 changed files with 17 additions and 5 deletions
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22
hledger-lib/Hledger/Data/Dates.hs
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@ -550,13 +550,25 @@ parsedateM s = firstJust [
--
-- >>> parsedate "2008/02/03"
-- 2008-02-03
-- >>> parsedate "2008/02/03/"
-- *** Exception: could not parse date "2008/02/03/"
-- >>> parsedate "2008/02/30" -- invalid dates may get silently adjusted
-- 2008-02-29
parsedate :: String -> Day
parsedate s = fromMaybe (error' $ "could not parse date \"" ++ s ++ "\"")
(parsedateM s)
-- doctests I haven't been able to make compatible with both GHC 7 and 8
-- -- >>> parsedate "2008/02/03/"
-- -- *** Exception: could not parse date "2008/02/03/"
-- #if MIN_VERSION_base(4,9,0)
-- -- ...
-- #endif
-- #if MIN_VERSION_time(1,6,0)
-- -- >>> parsedate "2008/02/30" -- with time >= 1.6, invalid dates are rejected
-- -- *** Exception: could not parse date "2008/02/30"
-- #if MIN_VERSION_base(4,9,0)
-- -- ...
-- #endif
-- #else
-- -- >>> parsedate "2008/02/30" -- with time < 1.6, they are silently adjusted
-- -- 2008-02-29
-- #endif
-- | Parse a time string to a time type using the provided pattern, or
-- return the default.
@ -855,4 +867,4 @@ nulldatespan :: DateSpan
nulldatespan = DateSpan Nothing Nothing
nulldate :: Day
nulldate = parsedate "0000/00/00"
nulldate = fromGregorian 0 1 1