150 lines
4.4 KiB
Haskell
150 lines
4.4 KiB
Haskell
#!/usr/bin/env runhaskell
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{-|
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hledger - a ledger-compatible text-based accounting tool.
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Copyright (c) 2007-2008 Simon Michael <simon@joyful.com>
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Released under GPL version 3 or later.
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This is a minimal haskell clone of John Wiegley's ledger
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<http://newartisans.com/software/ledger.html>. hledger generates
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simple ledger-compatible register & balance reports from a standard
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ledger file, and demonstrates a (naive) purely functional
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implementation of ledger.
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Code overview:
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The early code defined types in each module and so was very strictly
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layered. Since then, all data types have been moved to "Types" at the
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bottom, but the original modules are still used to group related
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functions/methods. Here is the approximate module hierarchy:
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@
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hledger ("Main")
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"Options"
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"Tests"
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"Parse"
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"Models"
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"TimeLog"
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"Ledger"
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"Account"
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"Transaction"
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"LedgerFile"
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"LedgerEntry"
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"LedgerTransaction"
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"AccountName"
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"Amount"
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"Currency"
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"Types"
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"Utils"
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@
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-}
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module Main
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where
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import System
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import Text.ParserCombinators.Parsec (ParseError)
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import qualified Data.Map as Map (lookup)
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import Options
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import Models
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import Parse
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import Tests
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import Utils hiding (test)
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main :: IO ()
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main = do
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(opts, (cmd:args)) <- getArgs >>= parseOptions
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let pats = parsePatternArgs args
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run cmd opts pats
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where run cmd opts pats
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| Help `elem` opts = putStr usage
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| cmd `isPrefixOf` "test" = test opts pats
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| cmd `isPrefixOf` "print" = doWithFilteredLedger opts pats printentries
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| cmd `isPrefixOf` "register" = doWithFilteredLedger opts pats printregister
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| cmd `isPrefixOf` "balance" = balance opts pats
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| otherwise = putStr usage
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doWithFilteredLedger :: [Flag] -> FilterPatterns -> (Ledger -> IO ()) -> IO ()
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doWithFilteredLedger opts pats cmd = do
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ledgerFilePath opts >>= parseLedgerFile >>= doWithParsed pats cmd
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doWithParsed :: FilterPatterns -> (Ledger -> IO ()) -> (Either ParseError LedgerFile) -> IO ()
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doWithParsed pats cmd parsed = do
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case parsed of Left e -> parseError e
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Right l -> cmd $ cacheLedger pats l
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type Command = [Flag] -> FilterPatterns -> IO ()
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test :: Command
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test opts pats = do
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Tests.hunit
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Tests.quickcheck
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return ()
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printentries l = putStr $ showEntries $ setprecisions $ entries $ rawledger l
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where setprecisions = map (entrySetPrecision (lprecision l))
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printregister l = putStr $ showTransactionsWithBalances
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(sortBy (comparing date) $ ledgerTransactions l)
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nullamt{precision=lprecision l}
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balance :: Command
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balance opts pats = do
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doWithFilteredLedger opts pats printbalance
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where
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printbalance l =
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putStr $ showLedgerAccounts l depth
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where
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showsubs = (ShowSubs `elem` opts)
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depth = case (pats, showsubs) of
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((Nothing,_), False) -> 1
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otherwise -> 9999
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-- helpers for interacting in ghci
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-- | return a Ledger parsed from the file your LEDGER environment variable
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-- points to or (WARNING:) an empty one if there was a problem.
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myledger :: IO Ledger
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myledger = do
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parsed <- ledgerFilePath [] >>= parseLedgerFile
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let ledgerfile = either (\_ -> LedgerFile [] [] [] "") id parsed
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return $ cacheLedger (argpats [] []) ledgerfile
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-- | return a Ledger parsed from the given file path
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ledgerfromfile :: String -> IO Ledger
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ledgerfromfile f = do
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parsed <- ledgerFilePath [File f] >>= parseLedgerFile
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let ledgerfile = either (\_ -> LedgerFile [] [] [] "") id parsed
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return $ cacheLedger (argpats [] []) ledgerfile
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accountnamed :: AccountName -> IO Account
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accountnamed a = myledger >>= (return . fromMaybe nullacct . Map.lookup a . accounts)
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--clearedBalanceToDate :: String -> Amount
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{-
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ghci examples:
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$ ghci hledger.hs
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GHCi, version 6.8.2: http://www.haskell.org/ghc/ :? for help
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Loading package base ... linking ... done.
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Ok, modules loaded: Utils, Main, Tests, Parse, Models, Ledger, LedgerFile, LedgerEntry, Amount, Currency, Types, LedgerTransaction, AccountName, Transaction, Account, TimeLog, Options.
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Prelude Main> l <- myledger
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<..snip..>
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Ledger with 628 entries, 128 accounts
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Prelude Main>
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$ ghci hledger.hs
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> l <- myledger
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> putStr $ drawTree $ treemap show $ accountnametree l
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> putStr $ showLedgerAccounts l 1
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> printregister l
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> import Types
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> accounts l
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> accountnamed "assets"
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-}
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