{- git-annex-shell main program
 -
 - Copyright 2010 Joey Hess <joey@kitenet.net>
 -
 - Licensed under the GNU GPL version 3 or higher.
 -}

import System.Environment

import Annex.Common
import qualified Git
import CmdLine
import Command
import Options

import qualified Command.ConfigList
import qualified Command.InAnnex
import qualified Command.DropKey
import qualified Command.RecvKey
import qualified Command.SendKey

cmds :: [Command]
cmds = map adddirparam $ concat
	[ Command.ConfigList.command
	, Command.InAnnex.command
	, Command.DropKey.command
	, Command.RecvKey.command
	, Command.SendKey.command
	]
	where
		adddirparam c = c { cmdparams = "DIRECTORY " ++ cmdparams c }

header :: String
header = "Usage: git-annex-shell [-c] command [parameters ...] [option ..]"

main :: IO ()
main = main' =<< getArgs

main' :: [String] -> IO ()
main' [] = failure
-- skip leading -c options, passed by eg, ssh
main' ("-c":p) = main' p
-- a command can be either a builtin or something to pass to git-shell
main' c@(cmd:dir:params)
	| cmd `elem` builtins = builtin cmd dir params
	| otherwise = external c
main' c@(cmd:_)
	-- Handle the case of being the user's login shell. It will be passed
	-- a single string containing all the real parameters.
	| "git-annex-shell " `isPrefixOf` cmd = main' $ drop 1 $ shellUnEscape cmd
	| cmd `elem` builtins = failure
	| otherwise = external c

builtins :: [String]
builtins = map cmdname cmds

builtin :: String -> String -> [String] -> IO ()
builtin cmd dir params =
	Git.repoAbsPath dir >>= Git.repoFromAbsPath >>=
		dispatch (cmd : filterparams params) cmds commonOptions header

external :: [String] -> IO ()
external params =
	unlessM (boolSystem "git-shell" $ map Param $ "-c":filterparams params) $
		error "git-shell failed"

-- Drop all args after "--".
-- These tend to be passed by rsync and not useful.
filterparams :: [String] -> [String]
filterparams [] = []
filterparams ("--":_) = []
filterparams (a:as) = a:filterparams as

failure :: IO ()
failure = error $ "bad parameters\n\n" ++ usage header cmds commonOptions