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|
{- git-annex command line parsing and dispatch
-
- Copyright 2010 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module CmdLine (
dispatch,
usage,
shutdown
) where
import System.IO
import System.IO.Error (try)
import System.Console.GetOpt
import Control.Monad.State (liftIO)
import Control.Monad (when, unless)
import qualified Annex
import qualified GitRepo as Git
import qualified GitQueue
import Types
import Command
import BackendList
import Upgrade
import Options
import Messages
import UUID
{- Runs the passed command line. -}
dispatch :: Git.Repo -> [String] -> [Command] -> [Option] -> String -> IO ()
dispatch gitrepo args cmds options header = do
forceUtf8
state <- Annex.new gitrepo allBackends
(actions, state') <- Annex.run state $ parseCmd args header cmds options
tryRun state' $ [startup, upgrade] ++ actions ++ [shutdown]
{- Parses command line, stores configure flags, and returns a
- list of actions to be run in the Annex monad. -}
parseCmd :: [String] -> String -> [Command] -> [Option] -> Annex [Annex Bool]
parseCmd argv header cmds options = do
(flags, params) <- liftIO $ getopt
when (null params) $ error $ "missing command" ++ usagemsg
case lookupCmd (head params) of
[] -> error $ "unknown command" ++ usagemsg
[command] -> do
_ <- sequence flags
prepCmd command (drop 1 params)
_ -> error "internal error: multiple matching commands"
where
getopt = case getOpt Permute options argv of
(flags, params, []) ->
return (flags, params)
(_, _, errs) ->
ioError (userError (concat errs ++ usagemsg))
lookupCmd cmd = filter (\c -> cmd == cmdname c) cmds
usagemsg = "\n\n" ++ usage header cmds options
{- Usage message with lists of commands and options. -}
usage :: String -> [Command] -> [Option] -> String
usage header cmds options =
usageInfo (header ++ "\n\nOptions:") options ++
"\nCommands:\n" ++ cmddescs
where
cmddescs = unlines $ map (indent . showcmd) cmds
showcmd c =
cmdname c ++
pad (longest cmdname + 1) (cmdname c) ++
cmdparams c ++
pad (longest cmdparams + 2) (cmdparams c) ++
cmddesc c
pad n s = replicate (n - length s) ' '
longest f = foldl max 0 $ map (length . f) cmds
{- Runs a list of Annex actions. Catches IO errors and continues
- (but explicitly thrown errors terminate the whole command).
-}
tryRun :: Annex.AnnexState -> [Annex Bool] -> IO ()
tryRun state actions = tryRun' state 0 actions
tryRun' :: Annex.AnnexState -> Integer -> [Annex Bool] -> IO ()
tryRun' state errnum (a:as) = do
result <- try $ Annex.run state a
case result of
Left err -> do
Annex.eval state $ showErr err
tryRun' state (errnum + 1) as
Right (True,state') -> tryRun' state' errnum as
Right (False,state') -> tryRun' state' (errnum + 1) as
tryRun' _ errnum [] = do
when (errnum > 0) $ error $ show errnum ++ " failed"
{- Actions to perform each time ran. -}
startup :: Annex Bool
startup = do
prepUUID
return True
{- Cleanup actions. -}
shutdown :: Annex Bool
shutdown = do
q <- Annex.getState Annex.repoqueue
unless (q == GitQueue.empty) $ do
showSideAction "Recording state in git..."
Annex.queueRun
liftIO $ Git.reap
return True
|
