{- git-annex command-line options
 -
 - Copyright 2010-2011 Joey Hess <joey@kitenet.net>
 -
 - Licensed under the GNU GPL version 3 or higher.
 -}

module Option (
	common,
	matcher,
	flag,
	field,
	name,
	ArgDescr(..),
	OptDescr(..),
) where

import System.Console.GetOpt
import System.Log.Logger

import Common.Annex
import qualified Annex
import Types.Messages
import Limit
import Usage

common :: [Option]
common =
	[ Option [] ["force"] (NoArg (setforce True))
		"allow actions that may lose annexed data"
	, Option ['F'] ["fast"] (NoArg (setfast True))
		"avoid slow operations"
	, Option ['a'] ["auto"] (NoArg (setauto True))
		"automatic mode"
	, Option ['q'] ["quiet"] (NoArg (Annex.setOutput QuietOutput))
		"avoid verbose output"
	, Option ['v'] ["verbose"] (NoArg (Annex.setOutput NormalOutput))
		"allow verbose output (default)"
	, Option ['j'] ["json"] (NoArg (Annex.setOutput JSONOutput))
		"enable JSON output"
	, Option ['d'] ["debug"] (NoArg setdebug)
		"show debug messages"
	, Option ['b'] ["backend"] (ReqArg setforcebackend paramName)
		"specify key-value backend to use"
	]
	where
		setforce v = Annex.changeState $ \s -> s { Annex.force = v }
		setfast v = Annex.changeState $ \s -> s { Annex.fast = v }
		setauto v = Annex.changeState $ \s -> s { Annex.auto = v }
		setforcebackend v = Annex.changeState $ \s -> s { Annex.forcebackend = Just v }
		setdebug = liftIO $ updateGlobalLogger rootLoggerName $
			setLevel DEBUG

matcher :: [Option]
matcher =
	[ longopt "not" "negate next option"
	, longopt "and" "both previous and next option must match"
	, longopt "or" "either previous or next option must match"
	, shortopt "(" "open group of options"
	, shortopt ")" "close group of options"
	]
	where
		longopt o = Option [] [o] $ NoArg $ addToken o
		shortopt o = Option o [] $ NoArg $ addToken o

{- An option that sets a flag. -}
flag :: String -> String -> String -> Option
flag short opt description = 
	Option short [opt] (NoArg (Annex.setFlag opt)) description

{- An option that sets a field. -}
field :: String -> String -> String -> String -> Option
field short opt paramdesc description = 
	Option short [opt] (ReqArg (Annex.setField opt) paramdesc) description

{- The flag or field name used for an option. -}
name :: Option -> String
name (Option _ o _ _) = Prelude.head o