hledger/hledger-lib/Hledger/Data/Transaction.hs
Simon Michael 8d75635505 print: limit display precision of generated prices (#262)
When a transaction posts to two commodities without specifying the
conversion price, we generate a price which makes it balance
(cf http://hledger.org/manual.html#prices).

Until now, these generated prices were always shown with full precision
(all available decimal digits) so that a manual calculation with the
displayed numbers would agree.

If there's just one posting in the commodity being priced, we can use an
exact total price and the precision is no problem.

But if there are multiple postings in the commodity being priced, we
must show the averaged unit price. This can be an irrational number,
which with our current Decimal-based implementation would display an
excessive 255 decimal digits. So in this case we now set the price's
display precision to the sum of the (max) display precisions of the
commodities involved. An example:

hledgerdev -f- print
<<<
1/1
    c    C 10.00
    c    C 11.00
    d  D -320.00
>>>
2015/01/01
    c  C 10.00 @ D 15.2381
    c  C 11.00 @ D 15.2381
    d     D -320.00

>>>=0

There might still be cases where this will show more price decimal
places than necessary. For now, YAGNI.
2015-05-27 14:21:19 -07:00

567 lines
26 KiB
Haskell

{-|
A 'Transaction' represents a movement of some commodity(ies) between two
or more accounts. It consists of multiple account 'Posting's which balance
to zero, a date, and optional extras like description, cleared status, and
tags.
-}
module Hledger.Data.Transaction (
-- * Transaction
nullsourcepos,
nulltransaction,
txnTieKnot,
-- settxn,
-- * operations
showAccountName,
hasRealPostings,
realPostings,
virtualPostings,
balancedVirtualPostings,
transactionsPostings,
isTransactionBalanced,
-- nonzerobalanceerror,
-- * date operations
transactionDate2,
-- * arithmetic
transactionPostingBalances,
balanceTransaction,
-- * rendering
showTransaction,
showTransactionUnelided,
-- * misc.
tests_Hledger_Data_Transaction
)
where
import Data.List
import Data.Maybe
import Data.Time.Calendar
import Test.HUnit
import Text.Printf
import qualified Data.Map as Map
import Text.Parsec.Pos
import Hledger.Utils
import Hledger.Data.Types
import Hledger.Data.Dates
import Hledger.Data.Posting
import Hledger.Data.Amount
instance Show Transaction where show = showTransactionUnelided
instance Show ModifierTransaction where
show t = "= " ++ mtvalueexpr t ++ "\n" ++ unlines (map show (mtpostings t))
instance Show PeriodicTransaction where
show t = "~ " ++ ptperiodicexpr t ++ "\n" ++ unlines (map show (ptpostings t))
nullsourcepos :: SourcePos
nullsourcepos = initialPos ""
nulltransaction :: Transaction
nulltransaction = Transaction {
tsourcepos=nullsourcepos,
tdate=nulldate,
tdate2=Nothing,
tstatus=Uncleared,
tcode="",
tdescription="",
tcomment="",
ttags=[],
tpostings=[],
tpreceding_comment_lines=""
}
{-|
Show a journal transaction, formatted for the print command. ledger 2.x's
standard format looks like this:
@
yyyy/mm/dd[ *][ CODE] description......... [ ; comment...............]
account name 1..................... ...$amount1[ ; comment...............]
account name 2..................... ..$-amount1[ ; comment...............]
pcodewidth = no limit -- 10 -- mimicking ledger layout.
pdescwidth = no limit -- 20 -- I don't remember what these mean,
pacctwidth = 35 minimum, no maximum -- they were important at the time.
pamtwidth = 11
pcommentwidth = no limit -- 22
@
-}
showTransaction :: Transaction -> String
showTransaction = showTransaction' True
showTransactionUnelided :: Transaction -> String
showTransactionUnelided = showTransaction' False
tests_showTransactionUnelided = [
"showTransactionUnelided" ~: do
let t `gives` s = assertEqual "" s (showTransactionUnelided t)
nulltransaction `gives` "0000/01/01\n\n"
nulltransaction{
tdate=parsedate "2012/05/14",
tdate2=Just $ parsedate "2012/05/15",
tstatus=Uncleared,
tcode="code",
tdescription="desc",
tcomment="tcomment1\ntcomment2\n",
ttags=[("ttag1","val1")],
tpostings=[
nullposting{
pstatus=Cleared,
paccount="a",
pamount=Mixed [usd 1, hrs 2],
pcomment="\npcomment2\n",
ptype=RegularPosting,
ptags=[("ptag1","val1"),("ptag2","val2")]
}
]
}
`gives` unlines [
"2012/05/14=2012/05/15 (code) desc ; tcomment1",
" ; tcomment2",
" $1.00",
" * a 2.00h",
" ; pcomment2",
""
]
]
-- cf showPosting
showTransaction' :: Bool -> Transaction -> String
showTransaction' elide t =
unlines $ [descriptionline]
++ newlinecomments
++ (postingsAsLines elide t (tpostings t))
++ [""]
where
descriptionline = rstrip $ concat [date, status, code, desc, samelinecomment]
date = showdate (tdate t) ++ maybe "" showedate (tdate2 t)
showdate = printf "%-10s" . showDate
showedate = printf "=%s" . showdate
status | tstatus t == Cleared = " *"
| tstatus t == Pending = " !"
| otherwise = ""
code = if length (tcode t) > 0 then printf " (%s)" $ tcode t else ""
desc = if null d then "" else " " ++ d where d = tdescription t
(samelinecomment, newlinecomments) =
case renderCommentLines (tcomment t) of [] -> ("",[])
c:cs -> (c,cs)
-- Render a transaction or posting's comment as indented, semicolon-prefixed comment lines.
renderCommentLines :: String -> [String]
renderCommentLines s = case lines s of ("":ls) -> "":map commentprefix ls
ls -> map commentprefix ls
where
commentprefix = indent . ("; "++)
-- -- Render a transaction or posting's comment as semicolon-prefixed comment lines -
-- -- an inline (same-line) comment if it's a single line, otherwise multiple indented lines.
-- commentLines' :: String -> (String, [String])
-- commentLines' s
-- | null s = ("", [])
-- | length ls == 1 = (prefix $ head ls, [])
-- | otherwise = ("", (prefix $ head ls):(map prefix $ tail ls))
-- where
-- ls = lines s
-- prefix = indent . (";"++)
postingsAsLines :: Bool -> Transaction -> [Posting] -> [String]
postingsAsLines elide t ps
| elide && length ps > 1 && isTransactionBalanced Nothing t -- imprecise balanced check
= (concatMap (postingAsLines False ps) $ init ps) ++ postingAsLines True ps (last ps)
| otherwise = concatMap (postingAsLines False ps) ps
postingAsLines :: Bool -> [Posting] -> Posting -> [String]
postingAsLines elideamount ps p =
postinglines
++ newlinecomments
where
postinglines = map rstrip $ lines $ concatTopPadded [showacct p, " ", amount, samelinecomment]
amount = if elideamount then "" else showamt (pamount p)
(samelinecomment, newlinecomments) =
case renderCommentLines (pcomment p) of [] -> ("",[])
c:cs -> (c,cs)
showacct p =
indent $ showstatus p ++ printf (printf "%%-%ds" w) (showAccountName Nothing (ptype p) (paccount p))
where
showstatus p = if pstatus p == Cleared then "* " else ""
w = maximum $ map (length . paccount) ps
showamt =
padleft 12 . showMixedAmount
tests_postingAsLines = [
"postingAsLines" ~: do
let p `gives` ls = assertEqual "" ls (postingAsLines False [p] p)
posting `gives` [" 0"]
posting{
pstatus=Cleared,
paccount="a",
pamount=Mixed [usd 1, hrs 2],
pcomment="pcomment1\npcomment2\n tag3: val3 \n",
ptype=RegularPosting,
ptags=[("ptag1","val1"),("ptag2","val2")]
}
`gives` [
" $1.00",
" * a 2.00h ; pcomment1",
" ; pcomment2",
" ; tag3: val3 "
]
]
indent :: String -> String
indent = (" "++)
-- | Show an account name, clipped to the given width if any, and
-- appropriately bracketed/parenthesised for the given posting type.
showAccountName :: Maybe Int -> PostingType -> AccountName -> String
showAccountName w = fmt
where
fmt RegularPosting = take w'
fmt VirtualPosting = parenthesise . reverse . take (w'-2) . reverse
fmt BalancedVirtualPosting = bracket . reverse . take (w'-2) . reverse
w' = fromMaybe 999999 w
parenthesise s = "("++s++")"
bracket s = "["++s++"]"
hasRealPostings :: Transaction -> Bool
hasRealPostings = not . null . realPostings
realPostings :: Transaction -> [Posting]
realPostings = filter isReal . tpostings
virtualPostings :: Transaction -> [Posting]
virtualPostings = filter isVirtual . tpostings
balancedVirtualPostings :: Transaction -> [Posting]
balancedVirtualPostings = filter isBalancedVirtual . tpostings
transactionsPostings :: [Transaction] -> [Posting]
transactionsPostings = concat . map tpostings
-- | Get the sums of a transaction's real, virtual, and balanced virtual postings.
transactionPostingBalances :: Transaction -> (MixedAmount,MixedAmount,MixedAmount)
transactionPostingBalances t = (sumPostings $ realPostings t
,sumPostings $ virtualPostings t
,sumPostings $ balancedVirtualPostings t)
-- | Is this transaction balanced ? A balanced transaction's real
-- (non-virtual) postings sum to 0, and any balanced virtual postings
-- also sum to 0.
isTransactionBalanced :: Maybe (Map.Map Commodity AmountStyle) -> Transaction -> Bool
isTransactionBalanced styles t =
-- isReallyZeroMixedAmountCost rsum && isReallyZeroMixedAmountCost bvsum
isZeroMixedAmount rsum' && isZeroMixedAmount bvsum'
where
(rsum, _, bvsum) = transactionPostingBalances t
rsum' = canonicalise $ costOfMixedAmount rsum
bvsum' = canonicalise $ costOfMixedAmount bvsum
canonicalise = maybe id canonicaliseMixedAmount styles
-- XXX refactor
-- | Ensure this transaction is balanced, possibly inferring a missing
-- amount or conversion price, or return an error message.
--
-- Balancing is affected by commodity display precisions, so those may
-- be provided.
--
-- We can infer a missing real amount when there are multiple real
-- postings and exactly one of them is amountless (likewise for
-- balanced virtual postings). Inferred amounts are converted to cost
-- basis when possible.
--
-- We can infer a conversion price when all real amounts are specified
-- and the sum of real postings' amounts is exactly two
-- non-explicitly-priced amounts in different commodities (likewise
-- for balanced virtual postings).
balanceTransaction :: Maybe (Map.Map Commodity AmountStyle) -> Transaction -> Either String Transaction
balanceTransaction styles t@Transaction{tpostings=ps}
| length rwithoutamounts > 1 || length bvwithoutamounts > 1
= Left $ printerr "could not balance this transaction (can't have more than one missing amount; remember to put 2 or more spaces before amounts)"
| not $ isTransactionBalanced styles t''' = Left $ printerr $ nonzerobalanceerror t'''
| otherwise = Right t''''
where
-- maybe infer missing amounts
(rwithamounts, rwithoutamounts) = partition hasAmount $ realPostings t
(bvwithamounts, bvwithoutamounts) = partition hasAmount $ balancedVirtualPostings t
ramounts = map pamount rwithamounts
bvamounts = map pamount bvwithamounts
t' = t{tpostings=map inferamount ps}
where
inferamount p | not (hasAmount p) && isReal p = p{pamount = costOfMixedAmount (- sum ramounts)}
| not (hasAmount p) && isBalancedVirtual p = p{pamount = costOfMixedAmount (- sum bvamounts)}
| otherwise = p
-- maybe infer conversion prices, for real postings
rmixedamountsinorder = map pamount $ realPostings t'
ramountsinorder = concatMap amounts rmixedamountsinorder
rcommoditiesinorder = map acommodity ramountsinorder
rsumamounts = amounts $ sum rmixedamountsinorder
-- as it says above, we can infer a conversion price when
t'' = if t'==t -- all real amounts were explicit (we didn't have to infer any)
&& length rsumamounts == 2 -- and the sum of real amounts has exactly two commodities (assumption: summing mixed amounts normalises to one simple amount per commodity)
&& all ((==NoPrice).aprice) rsumamounts -- and none of the amounts had explicit prices
then t'{tpostings=map inferprice ps}
else t'
where
inferprice p@Posting{pamount=Mixed [a@Amount{acommodity=c,aprice=NoPrice}], ptype=RegularPosting} -- assumption: a posting's mixed amount contains one simple amount
= p{pamount=Mixed [a{aprice=conversionprice c}]}
where
conversionprice c | c == unpricedcommodity
-- calculate a price that makes the postings balance, and give it "just enough"
-- display precision that a manual calculation with the displayed numbers
-- shows the transaction balancing.
= if length ramountsinunpricedcommodity == 1
-- when there is only one posting in the target commodity,
-- show a total price (@@) for more exact output. In this
-- case show all available decimal digits, it shouldn't be too many.
then TotalPrice $ abs targetcommodityamount `withPrecision` maxprecision
-- otherwise, calculate the average unit conversion price across all postings.
-- Set the precision to the sum of the precisions of the commodities involved,
-- which should be enough to make calculation look right while also preventing
-- irrational numbers from printing excessive digits.
else UnitPrice $ abs unitprice `withPrecision` sumofprecisions
| otherwise = NoPrice
where
unpricedcommodity = head $ filter (`elem` (map acommodity rsumamounts)) rcommoditiesinorder
unpricedamount = head $ filter ((==unpricedcommodity).acommodity) rsumamounts
targetcommodityamount = head $ filter ((/=unpricedcommodity).acommodity) rsumamounts
ramountsinunpricedcommodity = filter ((==unpricedcommodity).acommodity) ramountsinorder
unitprice = targetcommodityamount `divideAmount` (aquantity unpricedamount)
sumofprecisions = (asprecision $ astyle $ targetcommodityamount) + (asprecision $ astyle $ unpricedamount)
inferprice p = p
-- maybe infer prices for balanced virtual postings. Duplicates the above. XXX
bvmixedamountsinorder = map pamount $ balancedVirtualPostings t''
bvamountsinorder = concatMap amounts bvmixedamountsinorder
bvcommoditiesinorder = map acommodity bvamountsinorder
bvsumamounts = amounts $ sum bvmixedamountsinorder
t''' = if length bvsumamounts == 2 && all ((==NoPrice).aprice) bvsumamounts && t'==t -- XXX could check specifically for bv amount inferring
then t''{tpostings=map inferprice ps}
else t''
where
inferprice p@Posting{pamount=Mixed [a@Amount{acommodity=c,aprice=NoPrice}], ptype=BalancedVirtualPosting}
= p{pamount=Mixed [a{aprice=conversionprice c}]}
where
conversionprice c | c == unpricedcommodity
= if length bvamountsinunpricedcommodity == 1
then TotalPrice $ abs targetcommodityamount `withPrecision` maxprecision
else UnitPrice $ abs unitprice `withPrecision` sumofprecisions
| otherwise = NoPrice
where
unpricedcommodity = head $ filter (`elem` (map acommodity bvsumamounts)) bvcommoditiesinorder
unpricedamount = head $ filter ((==unpricedcommodity).acommodity) bvsumamounts
targetcommodityamount = head $ filter ((/=unpricedcommodity).acommodity) bvsumamounts
bvamountsinunpricedcommodity = filter ((==unpricedcommodity).acommodity) bvamountsinorder
unitprice = targetcommodityamount `divideAmount` (aquantity unpricedamount)
sumofprecisions = (asprecision $ astyle $ targetcommodityamount) + (asprecision $ astyle $ unpricedamount)
inferprice p = p
-- tie the knot so eg relatedPostings works right
t'''' = txnTieKnot t'''
printerr s = intercalate "\n" [s, showTransactionUnelided t]
nonzerobalanceerror :: Transaction -> String
nonzerobalanceerror t = printf "could not balance this transaction (%s%s%s)" rmsg sep bvmsg
where
(rsum, _, bvsum) = transactionPostingBalances t
rmsg | isReallyZeroMixedAmountCost rsum = ""
| otherwise = "real postings are off by " ++ showMixedAmount (costOfMixedAmount rsum)
bvmsg | isReallyZeroMixedAmountCost bvsum = ""
| otherwise = "balanced virtual postings are off by " ++ showMixedAmount (costOfMixedAmount bvsum)
sep = if not (null rmsg) && not (null bvmsg) then "; " else "" :: String
-- Get a transaction's secondary date, defaulting to the primary date.
transactionDate2 :: Transaction -> Day
transactionDate2 t = fromMaybe (tdate t) $ tdate2 t
-- | Ensure a transaction's postings refer back to it.
txnTieKnot :: Transaction -> Transaction
txnTieKnot t@Transaction{tpostings=ps} = t{tpostings=map (settxn t) ps}
-- | Set a posting's parent transaction.
settxn :: Transaction -> Posting -> Posting
settxn t p = p{ptransaction=Just t}
tests_Hledger_Data_Transaction = TestList $ concat [
tests_postingAsLines,
tests_showTransactionUnelided,
[
"showTransaction" ~: do
assertEqual "show a balanced transaction, eliding last amount"
(unlines
["2007/01/28 coopportunity"
," expenses:food:groceries $47.18"
," assets:checking"
,""
])
(let t = Transaction nullsourcepos (parsedate "2007/01/28") Nothing Uncleared "" "coopportunity" "" []
[posting{paccount="expenses:food:groceries", pamount=Mixed [usd 47.18], ptransaction=Just t}
,posting{paccount="assets:checking", pamount=Mixed [usd (-47.18)], ptransaction=Just t}
] ""
in showTransaction t)
,"showTransaction" ~: do
assertEqual "show a balanced transaction, no eliding"
(unlines
["2007/01/28 coopportunity"
," expenses:food:groceries $47.18"
," assets:checking $-47.18"
,""
])
(let t = Transaction nullsourcepos (parsedate "2007/01/28") Nothing Uncleared "" "coopportunity" "" []
[posting{paccount="expenses:food:groceries", pamount=Mixed [usd 47.18], ptransaction=Just t}
,posting{paccount="assets:checking", pamount=Mixed [usd (-47.18)], ptransaction=Just t}
] ""
in showTransactionUnelided t)
-- document some cases that arise in debug/testing:
,"showTransaction" ~: do
assertEqual "show an unbalanced transaction, should not elide"
(unlines
["2007/01/28 coopportunity"
," expenses:food:groceries $47.18"
," assets:checking $-47.19"
,""
])
(showTransaction
(txnTieKnot $ Transaction nullsourcepos (parsedate "2007/01/28") Nothing Uncleared "" "coopportunity" "" []
[posting{paccount="expenses:food:groceries", pamount=Mixed [usd 47.18]}
,posting{paccount="assets:checking", pamount=Mixed [usd (-47.19)]}
] ""))
,"showTransaction" ~: do
assertEqual "show an unbalanced transaction with one posting, should not elide"
(unlines
["2007/01/28 coopportunity"
," expenses:food:groceries $47.18"
,""
])
(showTransaction
(txnTieKnot $ Transaction nullsourcepos (parsedate "2007/01/28") Nothing Uncleared "" "coopportunity" "" []
[posting{paccount="expenses:food:groceries", pamount=Mixed [usd 47.18]}
] ""))
,"showTransaction" ~: do
assertEqual "show a transaction with one posting and a missing amount"
(unlines
["2007/01/28 coopportunity"
," expenses:food:groceries"
,""
])
(showTransaction
(txnTieKnot $ Transaction nullsourcepos (parsedate "2007/01/28") Nothing Uncleared "" "coopportunity" "" []
[posting{paccount="expenses:food:groceries", pamount=missingmixedamt}
] ""))
,"showTransaction" ~: do
assertEqual "show a transaction with a priced commodityless amount"
(unlines
["2010/01/01 x"
," a 1 @ $2"
," b"
,""
])
(showTransaction
(txnTieKnot $ Transaction nullsourcepos (parsedate "2010/01/01") Nothing Uncleared "" "x" "" []
[posting{paccount="a", pamount=Mixed [num 1 `at` (usd 2 `withPrecision` 0)]}
,posting{paccount="b", pamount= missingmixedamt}
] ""))
,"balanceTransaction" ~: do
assertBool "detect unbalanced entry, sign error"
(isLeft $ balanceTransaction Nothing
(Transaction nullsourcepos (parsedate "2007/01/28") Nothing Uncleared "" "test" "" []
[posting{paccount="a", pamount=Mixed [usd 1]}
,posting{paccount="b", pamount=Mixed [usd 1]}
] ""))
assertBool "detect unbalanced entry, multiple missing amounts"
(isLeft $ balanceTransaction Nothing
(Transaction nullsourcepos (parsedate "2007/01/28") Nothing Uncleared "" "test" "" []
[posting{paccount="a", pamount=missingmixedamt}
,posting{paccount="b", pamount=missingmixedamt}
] ""))
let e = balanceTransaction Nothing (Transaction nullsourcepos (parsedate "2007/01/28") Nothing Uncleared "" "" "" []
[posting{paccount="a", pamount=Mixed [usd 1]}
,posting{paccount="b", pamount=missingmixedamt}
] "")
assertBool "balanceTransaction allows one missing amount" (isRight e)
assertEqual "balancing amount is inferred"
(Mixed [usd (-1)])
(case e of
Right e' -> (pamount $ last $ tpostings e')
Left _ -> error' "should not happen")
let e = balanceTransaction Nothing (Transaction nullsourcepos (parsedate "2011/01/01") Nothing Uncleared "" "" "" []
[posting{paccount="a", pamount=Mixed [usd 1.35]}
,posting{paccount="b", pamount=Mixed [eur (-1)]}
] "")
assertBool "balanceTransaction can infer conversion price" (isRight e)
assertEqual "balancing conversion price is inferred"
(Mixed [usd 1.35 @@ (eur 1 `withPrecision` maxprecision)])
(case e of
Right e' -> (pamount $ head $ tpostings e')
Left _ -> error' "should not happen")
assertBool "balanceTransaction balances based on cost if there are unit prices" (isRight $
balanceTransaction Nothing (Transaction nullsourcepos (parsedate "2011/01/01") Nothing Uncleared "" "" "" []
[posting{paccount="a", pamount=Mixed [usd 1 `at` eur 2]}
,posting{paccount="a", pamount=Mixed [usd (-2) `at` eur 1]}
] ""))
assertBool "balanceTransaction balances based on cost if there are total prices" (isRight $
balanceTransaction Nothing (Transaction nullsourcepos (parsedate "2011/01/01") Nothing Uncleared "" "" "" []
[posting{paccount="a", pamount=Mixed [usd 1 @@ eur 1]}
,posting{paccount="a", pamount=Mixed [usd (-2) @@ eur 1]}
] ""))
,"isTransactionBalanced" ~: do
let t = Transaction nullsourcepos (parsedate "2009/01/01") Nothing Uncleared "" "a" "" []
[posting{paccount="b", pamount=Mixed [usd 1.00], ptransaction=Just t}
,posting{paccount="c", pamount=Mixed [usd (-1.00)], ptransaction=Just t}
] ""
assertBool "detect balanced" (isTransactionBalanced Nothing t)
let t = Transaction nullsourcepos (parsedate "2009/01/01") Nothing Uncleared "" "a" "" []
[posting{paccount="b", pamount=Mixed [usd 1.00], ptransaction=Just t}
,posting{paccount="c", pamount=Mixed [usd (-1.01)], ptransaction=Just t}
] ""
assertBool "detect unbalanced" (not $ isTransactionBalanced Nothing t)
let t = Transaction nullsourcepos (parsedate "2009/01/01") Nothing Uncleared "" "a" "" []
[posting{paccount="b", pamount=Mixed [usd 1.00], ptransaction=Just t}
] ""
assertBool "detect unbalanced, one posting" (not $ isTransactionBalanced Nothing t)
let t = Transaction nullsourcepos (parsedate "2009/01/01") Nothing Uncleared "" "a" "" []
[posting{paccount="b", pamount=Mixed [usd 0], ptransaction=Just t}
] ""
assertBool "one zero posting is considered balanced for now" (isTransactionBalanced Nothing t)
let t = Transaction nullsourcepos (parsedate "2009/01/01") Nothing Uncleared "" "a" "" []
[posting{paccount="b", pamount=Mixed [usd 1.00], ptransaction=Just t}
,posting{paccount="c", pamount=Mixed [usd (-1.00)], ptransaction=Just t}
,posting{paccount="d", pamount=Mixed [usd 100], ptype=VirtualPosting, ptransaction=Just t}
] ""
assertBool "virtual postings don't need to balance" (isTransactionBalanced Nothing t)
let t = Transaction nullsourcepos (parsedate "2009/01/01") Nothing Uncleared "" "a" "" []
[posting{paccount="b", pamount=Mixed [usd 1.00], ptransaction=Just t}
,posting{paccount="c", pamount=Mixed [usd (-1.00)], ptransaction=Just t}
,posting{paccount="d", pamount=Mixed [usd 100], ptype=BalancedVirtualPosting, ptransaction=Just t}
] ""
assertBool "balanced virtual postings need to balance among themselves" (not $ isTransactionBalanced Nothing t)
let t = Transaction nullsourcepos (parsedate "2009/01/01") Nothing Uncleared "" "a" "" []
[posting{paccount="b", pamount=Mixed [usd 1.00], ptransaction=Just t}
,posting{paccount="c", pamount=Mixed [usd (-1.00)], ptransaction=Just t}
,posting{paccount="d", pamount=Mixed [usd 100], ptype=BalancedVirtualPosting, ptransaction=Just t}
,posting{paccount="3", pamount=Mixed [usd (-100)], ptype=BalancedVirtualPosting, ptransaction=Just t}
] ""
assertBool "balanced virtual postings need to balance among themselves (2)" (isTransactionBalanced Nothing t)
]]