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dev: lib: note changed cost handling in amount arithmetic

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This commit is contained in:
Simon Michael 2022-10-01 18:35:49 -10:00
parent 3a4f23df95
commit a759a6e02e
1 changed files with 6 additions and 1 deletions
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7
hledger-lib/Hledger/Data/Amount.hs
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@ -585,10 +585,12 @@ mixedAmount :: Amount -> MixedAmount
mixedAmount a = Mixed $ M.singleton (amountKey a) a
-- | Add an Amount to a MixedAmount, normalising the result.
-- Amounts with different costs are kept separate.
maAddAmount :: MixedAmount -> Amount -> MixedAmount
maAddAmount (Mixed ma) a = Mixed $ M.insertWith sumSimilarAmountsUsingFirstPrice (amountKey a) a ma
-- | Add a collection of Amounts to a MixedAmount, normalising the result.
-- Amounts with different costs are kept separate.
maAddAmounts :: Foldable t => MixedAmount -> t Amount -> MixedAmount
maAddAmounts = foldl' maAddAmount
@ -596,15 +598,18 @@ maAddAmounts = foldl' maAddAmount
maNegate :: MixedAmount -> MixedAmount
maNegate = transformMixedAmount negate
-- | Sum two MixedAmount.
-- | Sum two MixedAmount, keeping the cost of the first if any.
-- Amounts with different costs are kept separate (since 2021).
maPlus :: MixedAmount -> MixedAmount -> MixedAmount
maPlus (Mixed as) (Mixed bs) = Mixed $ M.unionWith sumSimilarAmountsUsingFirstPrice as bs
-- | Subtract a MixedAmount from another.
-- Amounts with different costs are kept separate.
maMinus :: MixedAmount -> MixedAmount -> MixedAmount
maMinus a = maPlus a . maNegate
-- | Sum a collection of MixedAmounts.
-- Amounts with different costs are kept separate.
maSum :: Foldable t => t MixedAmount -> MixedAmount
maSum = foldl' maPlus nullmixedamt