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lib!: Semigroup instance of PeriodicReportRow and PeriodicReport now

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preserves first prrName, rather than the second.

Previously the second name would be taken, ignoring the first.
This commit is contained in:
Stephen Morgan 2021-11-06 11:32:55 +11:00 committed by Simon Michael
parent 1116846881
commit 38e311211d
1 changed files with 13 additions and 6 deletions
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19
hledger-lib/Hledger/Reports/ReportTypes.hs
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@ -29,6 +29,7 @@ module Hledger.Reports.ReportTypes
, prrFullName
, prrDisplayName
, prrDepth
, prrAdd
) where
import Data.Aeson (ToJSON(..))
@ -103,12 +104,18 @@ instance Bifunctor PeriodicReportRow where
second = fmap
instance Semigroup b => Semigroup (PeriodicReportRow a b) where
(PeriodicReportRow _ amts1 t1 a1) <> (PeriodicReportRow n2 amts2 t2 a2) =
PeriodicReportRow n2 (sumPadded amts1 amts2) (t1 <> t2) (a1 <> a2)
where
sumPadded (a:as) (b:bs) = (a <> b) : sumPadded as bs
sumPadded as [] = as
sumPadded [] bs = bs
(<>) = prrAdd
-- | Add two 'PeriodicReportRows', preserving the name of the first.
prrAdd :: Semigroup b => PeriodicReportRow a b -> PeriodicReportRow a b -> PeriodicReportRow a b
prrAdd (PeriodicReportRow n1 amts1 t1 a1) (PeriodicReportRow _ amts2 t2 a2) =
PeriodicReportRow n1 (zipWithPadded (<>) amts1 amts2) (t1 <> t2) (a1 <> a2)
-- | Version of 'zipWith' which will not end on the shortest list, but will copy the rest of the longer list.
zipWithPadded :: (a -> a -> a) -> [a] -> [a] -> [a]
zipWithPadded f (a:as) (b:bs) = f a b : zipWithPadded f as bs
zipWithPadded _ as [] = as
zipWithPadded _ [] bs = bs
-- | Figure out the overall date span of a PeriodicReport
periodicReportSpan :: PeriodicReport a b -> DateSpan