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8a64792ba7
New data reader modules need to provide just reader :: Reader, which is the format name, a detector predicate, and a parser.
130 lines
4.4 KiB
Haskell
130 lines
4.4 KiB
Haskell
{-# LANGUAGE CPP #-}
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{-|
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Read hledger data from various data formats, and related utilities.
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-}
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module Hledger.Read (
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tests_Hledger_Read,
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readJournalFile,
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readJournal,
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myLedgerPath,
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myTimelogPath,
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myJournal,
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myTimelog,
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)
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where
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import Hledger.Data.Types (Journal(..))
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import Hledger.Data.Utils
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import Hledger.Read.Common
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import Hledger.Read.Journal as Journal
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import Hledger.Read.Timelog as Timelog
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import Control.Monad.Error
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import Data.Either (partitionEithers)
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import Safe (headDef)
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import System.Directory (getHomeDirectory)
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import System.Environment (getEnv)
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import System.FilePath ((</>))
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import System.Exit
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import System.IO (stderr)
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#if __GLASGOW_HASKELL__ <= 610
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import Prelude hiding (readFile, putStr, putStrLn, print, getContents)
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import System.IO.UTF8
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#else
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import System.IO (hPutStrLn)
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#endif
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ledgerenvvar = "LEDGER"
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timelogenvvar = "TIMELOG"
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ledgerdefaultfilename = ".ledger"
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timelogdefaultfilename = ".timelog"
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-- Here are the available readers. The first is the default, used for unknown data formats.
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readers :: [Reader]
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readers = [
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Journal.reader
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,Timelog.reader
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]
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formats = map rFormat readers
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readerForFormat :: String -> Maybe Reader
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readerForFormat s | null rs = Nothing
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| otherwise = Just $ head rs
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where
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rs = filter ((s==).rFormat) readers :: [Reader]
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-- | Read a Journal from this string (and file path), auto-detecting the
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-- data format, or give an error. Tries to parse each known data format in
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-- turn. If none succeed, gives the error message specific to the intended
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-- data format, which if not specified is guessed from the file suffix and
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-- possibly the data.
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journalFromPathAndString :: Maybe String -> FilePath -> String -> IO Journal
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journalFromPathAndString format fp s = do
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let readers' = case format of Just f -> case readerForFormat f of Just r -> [r]
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Nothing -> []
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Nothing -> readers
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(errors, journals) <- partitionEithers `fmap` mapM try readers'
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case journals of j:_ -> return j
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_ -> hPutStrLn stderr (errMsg errors) >> exitWith (ExitFailure 1)
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where
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try r = (runErrorT . (rParser r) fp) s
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errMsg [] = unknownFormatMsg
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errMsg es = printf "could not parse %s data in %s\n%s" (rFormat r) fp e
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where (r,e) = headDef (head readers, head es) $ filter detects $ zip readers es
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detects (r,_) = (rDetector r) fp s
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unknownFormatMsg = printf "could not parse %sdata in %s" (fmt formats) fp
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where fmt [] = ""
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fmt [f] = f ++ " "
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fmt fs = intercalate ", " (init fs) ++ " or " ++ last fs ++ " "
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-- | Read a journal from this file, using the specified data format or
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-- trying all known formats, or give an error.
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readJournalFile :: Maybe String -> FilePath -> IO Journal
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readJournalFile format "-" = getContents >>= journalFromPathAndString format "(stdin)"
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readJournalFile format f = readFile f >>= journalFromPathAndString format f
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-- | Read a Journal from this string, using the specified data format or
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-- trying all known formats, or give an error.
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readJournal :: Maybe String -> String -> IO Journal
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readJournal format s = journalFromPathAndString format "(string)" s
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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`
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(\_ -> do
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home <- getHomeDirectory `catch` (\_ -> return "")
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return $ home </> ledgerdefaultfilename)
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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`
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(\_ -> do
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home <- getHomeDirectory
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return $ home </> timelogdefaultfilename)
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-- | Read the user's default journal file, or give an error.
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myJournal :: IO Journal
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myJournal = myLedgerPath >>= readJournalFile Nothing
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-- | Read the user's default timelog file, or give an error.
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myTimelog :: IO Journal
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myTimelog = myTimelogPath >>= readJournalFile Nothing
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tests_Hledger_Read = TestList
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[
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"ledgerFile" ~: do
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assertBool "ledgerFile should parse an empty file" (isRight $ parseWithCtx emptyCtx Journal.ledgerFile "")
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r <- readJournal Nothing "" -- don't know how to get it from ledgerFile
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assertBool "ledgerFile parsing an empty file should give an empty ledger" $ null $ jtxns r
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,Journal.tests_Journal
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,Timelog.tests_Timelog
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]
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