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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.Error (try)
import System.Console.GetOpt
import Common.Annex
import qualified Annex
import qualified Annex.Queue
import qualified Git
import Annex.Content
import Command
type Params = [String]
type Flags = [Annex ()]
{- Runs the passed command line. -}
dispatch :: Params -> [Command] -> [Option] -> String -> Git.Repo -> IO ()
dispatch args cmds options header gitrepo = do
setupConsole
state <- Annex.new gitrepo
(actions, state') <- Annex.run state $ do
sequence_ flags
prepCommand cmd params
tryRun state' cmd $ [startup] ++ actions ++ [shutdown]
where
(flags, cmd, params) = parseCmd args cmds options header
{- Parses command line, and returns actions to run to configure flags,
- the Command being run, and the remaining parameters for the command. -}
parseCmd :: Params -> [Command] -> [Option] -> String -> (Flags, Command, Params)
parseCmd argv cmds options header = check $ getOpt Permute options argv
where
check (_, [], []) = err "missing command"
check (flags, name:rest, [])
| null matches = err $ "unknown command " ++ name
| otherwise = (flags, head matches, rest)
where
matches = filter (\c -> name == cmdname c) cmds
check (_, _, errs) = err $ concat errs
err msg = error $ msg ++ "\n\n" ++ usage header cmds options
{- Usage message with lists of commands and options. -}
usage :: String -> [Command] -> [Option] -> String
usage header cmds options = usageInfo top options ++ commands
where
top = header ++ "\n\nOptions:"
commands = "\nCommands:\n" ++ cmddescs
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 -> Command -> [CommandCleanup] -> IO ()
tryRun = tryRun' 0
tryRun' :: Integer -> Annex.AnnexState -> Command -> [CommandCleanup] -> IO ()
tryRun' errnum _ cmd []
| errnum > 0 = error $ cmdname cmd ++ ": " ++ show errnum ++ " failed"
| otherwise = return ()
tryRun' errnum state cmd (a:as) = run >>= handle
where
run = try $ Annex.run state $ do
Annex.Queue.flushWhenFull
a
handle (Left err) = showerr err >> cont False state
handle (Right (success, state')) = cont success state'
cont success s = tryRun' (if success then errnum else errnum + 1) s cmd as
showerr err = Annex.eval state $ do
showErr err
showEndFail
{- Actions to perform each time ran. -}
startup :: Annex Bool
startup = return True
{- Cleanup actions. -}
shutdown :: Annex Bool
shutdown = do
saveState
liftIO Git.reap -- zombies from long-running git processes
return True
|
