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112 lines
4.1 KiB
Haskell
112 lines
4.1 KiB
Haskell
{-|
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A 'Ledger' stores, for efficiency, a 'RawLedger' plus its tree of account
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names, a map from account names to 'Account's, and the display precision.
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Typically it has also has had the uninteresting 'Entry's filtered out.
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-}
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module Ledger.Ledger
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where
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import qualified Data.Map as Map
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import Data.Map ((!))
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import Ledger.Utils
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import Ledger.Types
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import Ledger.Amount
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import Ledger.AccountName
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import Ledger.Transaction
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import Ledger.RawLedger
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import Ledger.Entry
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instance Show Ledger where
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show l = printf "Ledger with %d entries, %d accounts\n%s"
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((length $ entries $ rawledger l) +
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(length $ modifier_entries $ rawledger l) +
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(length $ periodic_entries $ rawledger l))
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(length $ accountnames l)
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(showtree $ accountnametree l)
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-- | Convert a raw ledger to a more efficient cached type, described above.
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cacheLedger :: RawLedger -> Ledger
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cacheLedger l =
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let
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ant = rawLedgerAccountNameTree l
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anames = flatten ant
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ts = rawLedgerTransactions l
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sortedts = sortBy (comparing account) ts
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groupedts = groupBy (\t1 t2 -> account t1 == account t2) sortedts
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txnmap = Map.union
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(Map.fromList [(account $ head g, g) | g <- groupedts])
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(Map.fromList [(a,[]) | a <- anames])
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txnsof = (txnmap !)
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subacctsof a = filter (isAccountNamePrefixOf a) anames
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subtxnsof a = concat [txnsof a | a <- [a] ++ subacctsof a]
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balmap = Map.union
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(Map.fromList [(a, (sumTransactions $ subtxnsof a)) | a <- anames])
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(Map.fromList [(a,nullamt) | a <- anames])
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amap = Map.fromList [(a, Account a (txnmap ! a) (balmap ! a)) | a <- anames]
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in
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Ledger l ant amap
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-- | List a 'Ledger' 's account names.
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accountnames :: Ledger -> [AccountName]
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accountnames l = drop 1 $ flatten $ accountnametree l
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-- | Get the named account from a ledger.
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ledgerAccount :: Ledger -> AccountName -> Account
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ledgerAccount l a = (accountmap l) ! a
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-- | List a ledger's accounts, in tree order
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accounts :: Ledger -> [Account]
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accounts l = drop 1 $ flatten $ ledgerAccountTree 9999 l
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-- | List a ledger's top-level accounts, in tree order
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topAccounts :: Ledger -> [Account]
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topAccounts l = map root $ branches $ ledgerAccountTree 9999 l
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-- | Accounts in ledger whose name matches the pattern, in tree order.
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-- We apply ledger's special rules for balance report account matching
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-- (see 'matchLedgerPatterns').
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accountsMatching :: [String] -> Ledger -> [Account]
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accountsMatching pats l = filter (matchLedgerPatterns True pats . aname) $ accounts l
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-- | List a ledger account's immediate subaccounts
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subAccounts :: Ledger -> Account -> [Account]
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subAccounts l a = map (ledgerAccount l) subacctnames
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where
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allnames = accountnames l
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name = aname a
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subacctnames = filter (name `isAccountNamePrefixOf`) allnames
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-- | List a ledger's transactions.
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--
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-- NB this sets the amount precisions to that of the highest-precision
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-- amount, to help with report output. It should perhaps be done in the
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-- display functions, but those are far removed from the ledger. Keep in
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-- mind if doing more arithmetic with these.
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ledgerTransactions :: Ledger -> [Transaction]
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ledgerTransactions l = rawLedgerTransactions $ rawledger l
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-- | Get a ledger's tree of accounts to the specified depth.
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ledgerAccountTree :: Int -> Ledger -> Tree Account
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ledgerAccountTree depth l =
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addDataToAccountNameTree l depthpruned
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where
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nametree = accountnametree l
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depthpruned = treeprune depth nametree
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-- that's weird.. why can't this be in Account.hs ?
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instance Eq Account where
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(==) (Account n1 t1 b1) (Account n2 t2 b2) = n1 == n2 && t1 == t2 && b1 == b2
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-- | Get a ledger's tree of accounts rooted at the specified account.
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ledgerAccountTreeAt :: Ledger -> Account -> Maybe (Tree Account)
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ledgerAccountTreeAt l acct = subtreeat acct $ ledgerAccountTree 9999 l
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-- | Convert a tree of account names into a tree of accounts, using their
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-- parent ledger.
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addDataToAccountNameTree :: Ledger -> Tree AccountName -> Tree Account
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addDataToAccountNameTree = treemap . ledgerAccount
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