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124 lines
5.5 KiB
Haskell
124 lines
5.5 KiB
Haskell
{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE ViewPatterns #-}
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{-# LANGUAGE CPP #-}
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{-|
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A 'TransactionModifier' is a rule that modifies certain 'Transaction's,
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typically adding automated postings to them.
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-}
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module Hledger.Data.TransactionModifier (
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transactionModifierToFunction
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)
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where
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import Data.Maybe
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#if !(MIN_VERSION_base(4,11,0))
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import Data.Monoid ((<>))
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#endif
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import qualified Data.Text as T
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import Data.Time.Calendar
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import Hledger.Data.Types
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import Hledger.Data.Dates
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import Hledger.Data.Amount
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import Hledger.Data.Transaction
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import Hledger.Query
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import Hledger.Utils.UTF8IOCompat (error')
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import Hledger.Utils.Debug
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-- $setup
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-- >>> :set -XOverloadedStrings
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-- >>> import Hledger.Data.Posting
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-- >>> import Hledger.Data.Transaction
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-- >>> import Hledger.Data.Journal
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-- | Converts a 'TransactionModifier' to a 'Transaction'-transforming function,
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-- which applies the modification(s) specified by the TransactionModifier.
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-- Currently this means adding automated postings when certain other postings are present.
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-- The postings of the transformed transaction will reference it in the usual
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-- way (ie, 'txnTieKnot' is called).
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--
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-- >>> putStr $ showTransaction $ transactionModifierToFunction (TransactionModifier "" ["pong" `post` usd 2]) nulltransaction{tpostings=["ping" `post` usd 1]}
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-- 0000/01/01
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-- ping $1.00
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-- pong $2.00
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-- <BLANKLINE>
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-- >>> putStr $ showTransaction $ transactionModifierToFunction (TransactionModifier "miss" ["pong" `post` usd 2]) nulltransaction{tpostings=["ping" `post` usd 1]}
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-- 0000/01/01
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-- ping $1.00
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-- <BLANKLINE>
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-- >>> putStr $ showTransaction $ transactionModifierToFunction (TransactionModifier "ping" ["pong" `post` amount{aismultiplier=True, aquantity=3}]) nulltransaction{tpostings=["ping" `post` usd 2]}
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-- 0000/01/01
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-- ping $2.00
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-- pong $6.00
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-- <BLANKLINE>
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--
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transactionModifierToFunction :: TransactionModifier -> (Transaction -> Transaction)
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transactionModifierToFunction mt =
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\t@(tpostings -> ps) -> txnTieKnot t{ tpostings=generatePostings ps } -- TODO add modifier txn comment/tags ?
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where
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q = simplifyQuery $ tmParseQuery mt (error' "a transaction modifier's query cannot depend on current date")
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mods = map tmPostingRuleToFunction $ tmpostingrules mt
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generatePostings ps = [p' | p <- ps
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, p' <- if q `matchesPosting` p then p:[ m p | m <- mods] else [p]]
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-- | Parse the 'Query' from a 'TransactionModifier's 'tmquerytxt',
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-- and return it as a function requiring the current date.
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--
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-- >>> tmParseQuery (TransactionModifier "" []) undefined
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-- Any
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-- >>> tmParseQuery (TransactionModifier "ping" []) undefined
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-- Acct "ping"
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-- >>> tmParseQuery (TransactionModifier "date:2016" []) undefined
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-- Date (DateSpan 2016)
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-- >>> tmParseQuery (TransactionModifier "date:today" []) (read "2017-01-01")
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-- Date (DateSpan 2017/01/01)
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tmParseQuery :: TransactionModifier -> (Day -> Query)
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tmParseQuery mt = fst . flip parseQuery (tmquerytxt mt)
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-- | Converts a 'TransactionModifier''s posting rule to a 'Posting'-generating function,
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-- which will be used to make a new posting based on the old one (an "automated posting").
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-- The new posting's amount can optionally be the old posting's amount multiplied by a constant.
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-- If the old posting had a total-priced amount, the new posting's multiplied amount will be unit-priced.
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tmPostingRuleToFunction :: TMPostingRule -> (Posting -> Posting)
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tmPostingRuleToFunction pr =
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\p -> renderPostingCommentDates $ pr
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{ pdate = pdate p
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, pdate2 = pdate2 p
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, pamount = amount' p
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}
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where
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amount' = case postingRuleMultiplier pr of
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Nothing -> const $ pamount pr
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Just n -> \p ->
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-- Multiply the old posting's amount by the posting rule's multiplier.
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let
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pramount = dbg6 "pramount" $ head $ amounts $ pamount pr
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matchedamount = dbg6 "matchedamount" $ pamount p
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-- Handle a matched amount with a total price carefully so as to keep the transaction balanced (#928).
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-- Approach 1: convert to a unit price and increase the display precision slightly
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-- Mixed as = dbg6 "multipliedamount" $ n `multiplyMixedAmount` mixedAmountTotalPriceToUnitPrice matchedamount
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-- Approach 2: multiply the total price (keeping it positive) as well as the quantity
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Mixed as = dbg6 "multipliedamount" $ n `multiplyMixedAmountAndPrice` matchedamount
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in
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case acommodity pramount of
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"" -> Mixed as
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-- TODO multipliers with commodity symbols are not yet a documented feature.
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-- For now: in addition to multiplying the quantity, it also replaces the
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-- matched amount's commodity, display style, and price with those of the posting rule.
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c -> Mixed [a{acommodity = c, astyle = astyle pramount, aprice = aprice pramount} | a <- as]
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postingRuleMultiplier :: TMPostingRule -> Maybe Quantity
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postingRuleMultiplier p =
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case amounts $ pamount p of
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[a] | aismultiplier a -> Just $ aquantity a
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_ -> Nothing
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renderPostingCommentDates :: Posting -> Posting
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renderPostingCommentDates p = p { pcomment = comment' }
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where
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datesComment = T.concat $ catMaybes [T.pack . showDate <$> pdate p, ("=" <>) . T.pack . showDate <$> pdate2 p]
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comment'
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| T.null datesComment = pcomment p
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| otherwise = T.intercalate "\n" $ filter (not . T.null) [T.strip $ pcomment p, "[" <> datesComment <> "]"]
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