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95 lines
3.3 KiB
Haskell
95 lines
3.3 KiB
Haskell
{-|
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Utilities for doing I/O with ledger files.
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-}
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module Ledger.IO
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where
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import Control.Monad.Error
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import Data.Time.Clock
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import Data.Time.LocalTime (LocalTime)
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import Ledger.Ledger (cacheLedger)
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import Ledger.Parse (parseLedger)
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import Ledger.RawLedger (canonicaliseAmounts,filterRawLedger)
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import Ledger.Types (DateSpan(..),RawLedger,Ledger(..))
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import Ledger.Utils (getCurrentLocalTime)
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import System.Directory (getHomeDirectory)
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import System.Environment (getEnv)
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import System.IO
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import Text.ParserCombinators.Parsec
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import qualified Data.Map as Map (lookup)
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ledgerdefaultpath = "~/.ledger"
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timelogdefaultpath = "~/.timelog"
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ledgerenvvar = "LEDGER"
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timelogenvvar = "TIMELOG"
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-- | A set of arguments specifying how to filter a ledger file.
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type IOArgs = (DateSpan -- ^ only in this date span
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,Maybe Bool -- ^ only cleared/uncleared/don't care
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,Bool -- ^ only real/don't care
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,Bool -- ^ convert amounts to cost basis
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,[String] -- ^ account patterns
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,[String] -- ^ description patterns
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)
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noioargs = (DateSpan Nothing Nothing, Nothing, False, False, [], [])
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-- | Get the user's default ledger file path.
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myLedgerPath :: IO String
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myLedgerPath =
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getEnv ledgerenvvar `catch` \_ -> return ledgerdefaultpath
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-- | Get the user's default timelog file path.
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myTimelogPath :: IO String
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myTimelogPath =
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getEnv timelogenvvar `catch` \_ -> return timelogdefaultpath
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-- | Read the user's default ledger file, or give an error.
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myLedger :: IO Ledger
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myLedger = myLedgerPath >>= readLedger
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-- | Read the user's default timelog file, or give an error.
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myTimelog :: IO Ledger
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myTimelog = myTimelogPath >>= readLedger
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-- | Read a ledger from this file, with no filtering, or give an error.
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readLedger :: FilePath -> IO Ledger
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readLedger f = tildeExpand f >>= readLedgerWithIOArgs noioargs
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-- | Read a ledger from this file, filtering according to the io args,
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-- | or give an error.
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readLedgerWithIOArgs :: IOArgs -> FilePath -> IO Ledger
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readLedgerWithIOArgs ioargs f = do
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t <- getCurrentLocalTime
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s <- readFile f
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rl <- rawLedgerFromString s
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return $ filterAndCacheLedger ioargs s rl
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-- | Read a RawLedger from the given string, using the current time as
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-- reference time, or give a parse error.
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rawLedgerFromString :: String -> IO RawLedger
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rawLedgerFromString s = do
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t <- getCurrentLocalTime
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liftM (either error id) $ runErrorT $ parseLedger t "(string)" s
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-- | Convert a RawLedger to a canonicalised, cached and filtered Ledger.
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filterAndCacheLedger :: IOArgs -> String -> RawLedger -> Ledger
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filterAndCacheLedger (span,cleared,real,costbasis,apats,dpats) rawtext rl =
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(cacheLedger apats
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$ filterRawLedger span dpats cleared real
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$ canonicaliseAmounts costbasis rl
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){rawledgertext=rawtext}
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-- | Expand ~ in a file path (does not handle ~name).
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tildeExpand :: FilePath -> IO FilePath
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tildeExpand ('~':[]) = getHomeDirectory
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tildeExpand ('~':'/':xs) = getHomeDirectory >>= return . (++ ('/':xs))
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--handle ~name, requires -fvia-C or ghc 6.8:
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--import System.Posix.User
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-- tildeExpand ('~':xs) = do let (user, path) = span (/= '/') xs
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-- pw <- getUserEntryForName user
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-- return (homeDirectory pw ++ path)
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tildeExpand xs = return xs
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