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{- git-annex batch commands
-
- Copyright 2015 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module CmdLine.Batch where
import Common.Annex
import Command
data BatchMode = Batch | NoBatch
batchOption :: Parser BatchMode
batchOption = flag NoBatch Batch
( long "batch"
<> help "enable batch mode"
)
type Batchable t = BatchMode -> t -> CommandStart
-- A Batchable command can run in batch mode, or not.
-- In batch mode, one line at a time is read, parsed, and a reply output to
-- stdout. In non batch mode, the command's parameters are parsed and
-- a reply output for each.
batchable :: (opts -> String -> Annex Bool) -> Parser opts -> CmdParamsDesc -> CommandParser
batchable handler parser paramdesc = batchseeker <$> batchparser
where
batchparser = (,,)
<$> parser
<*> batchOption
<*> cmdParams paramdesc
batchseeker (opts, NoBatch, params) = mapM_ (go NoBatch opts) params
batchseeker (opts, Batch, _) = batchloop opts
batchloop opts = do
mp <- liftIO $ catchMaybeIO getLine
case mp of
Nothing -> return ()
Just p -> do
go Batch opts p
batchloop opts
go batchmode opts p =
unlessM (handler opts p) $
batchBadInput batchmode
-- bad input is indicated by an empty line in batch mode. In non batch
-- mode, exit on bad input.
batchBadInput :: BatchMode -> Annex ()
batchBadInput NoBatch = liftIO exitFailure
batchBadInput Batch = liftIO $ putStrLn ""
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