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104 lines
3.7 KiB
Haskell
104 lines
3.7 KiB
Haskell
module Options (parseOptions, parsePatternArgs, wildcard, Flag(..), usage, ledgerFilePath, parseLedgerAndDo)
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where
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import System.Console.GetOpt
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import System.Directory
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import System.Environment (getEnv)
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import Data.Maybe (fromMaybe)
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import Ledger.Utils
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import Ledger.Types
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import Ledger.Parse (parseLedgerFile, parseError)
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import Ledger.Ledger (cacheLedger)
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usagehdr = "Usage: hledger [OPTIONS] "++commands++" [ACCTPATTERNS] [-- DESCPATTERNS]\nOptions:"
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commands = "register|balance|print"
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defaultcmd = "register"
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options :: [OptDescr Flag]
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options = [
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Option ['f'] ["file"] (ReqArg File "FILE") "ledger file; - means use standard input",
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Option ['s'] ["showsubs"] (NoArg ShowSubs) "balance report: show subaccounts", -- register: show subtotals
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Option ['h'] ["help"] (NoArg Help) "show this help"
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--Option ['V'] ["version"] (NoArg Version) "show version"
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]
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data Flag =
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File String |
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ShowSubs |
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Help |
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Version
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deriving (Show,Eq)
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parseOptions :: [String] -> IO ([Flag], [String])
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parseOptions argv =
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case getOpt RequireOrder options argv of
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(opts,[],[]) -> return (opts, [defaultcmd])
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(opts,args,[]) -> return (opts, args)
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(_,_,errs) -> ioError (userError (concat errs ++ usage))
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-- testoptions RequireOrder ["foo","-v"]
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-- testoptions Permute ["foo","-v"]
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-- testoptions (ReturnInOrder Arg) ["foo","-v"]
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-- testoptions Permute ["foo","--","-v"]
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-- testoptions Permute ["-?o","--name","bar","--na=baz"]
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-- testoptions Permute ["--ver","foo"]
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testoptions order cmdline = putStr $
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case getOpt order options cmdline of
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(o,n,[] ) -> "options=" ++ show o ++ " args=" ++ show n
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(_,_,errs) -> concat errs ++ usage
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usage = usageInfo usagehdr options
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ledgerFilePath :: [Flag] -> IO String
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ledgerFilePath = findFileFromOpts "~/ledger.dat" "LEDGER"
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-- | find a file path from options, an env var or a default value
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findFileFromOpts :: FilePath -> String -> [Flag] -> IO String
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findFileFromOpts defaultpath envvar opts = do
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envordefault <- getEnv envvar `catch` \_ -> return defaultpath
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paths <- mapM tildeExpand $ [envordefault] ++ (concatMap getfile opts)
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return $ last paths
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where
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getfile (File s) = [s]
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getfile _ = []
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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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-- -- ~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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-- -- courtesy of allberry_b
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-- | ledger pattern arguments are: 0 or more account patterns
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-- optionally followed by -- and 0 or more description patterns.
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-- No arguments implies match all. We convert the arguments to
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-- a pair of regexps.
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parsePatternArgs :: [String] -> (Regex,Regex)
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parsePatternArgs args = (regexFor as, regexFor ds')
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where (as, ds) = break (=="--") args
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ds' = dropWhile (=="--") ds
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-- | convert a list of strings to a regular expression matching any of them,
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-- or a wildcard if there are none.
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regexFor :: [String] -> Regex
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regexFor [] = wildcard
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regexFor ss = mkRegex $ "(" ++ (unwords $ intersperse "|" ss) ++ ")"
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wildcard :: Regex
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wildcard = mkRegex ".*"
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-- | parse the user's specified ledger file and do some action with it
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-- (or report a parse error)
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parseLedgerAndDo :: [Flag] -> (Regex,Regex) -> (Ledger -> IO ()) -> IO ()
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parseLedgerAndDo opts pats cmd = do
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path <- ledgerFilePath opts
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parsed <- parseLedgerFile path
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case parsed of Left err -> parseError err
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Right l -> cmd $ cacheLedger l pats
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