42 lines
1.1 KiB
Haskell
42 lines
1.1 KiB
Haskell
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{- git-annex batch commands
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-
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- Copyright 2015 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module CmdLine.Batch where
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import Common.Annex
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import Command
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batchOption :: Option
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batchOption = flagOption [] "batch" "enable batch mode"
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data BatchMode = Batch | NoBatch
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type Batchable t = BatchMode -> t -> CommandStart
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-- A Batchable command can run in batch mode, or not.
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-- In batch mode, one line at a time is read, parsed, and a reply output to
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-- stdout. In non batch mode, the command's parameters are parsed and
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-- a reply output for each.
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batchable :: ((t -> CommandStart) -> CommandSeek) -> Batchable t -> CommandSeek
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batchable seeker starter params = ifM (getOptionFlag batchOption)
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( batchloop
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, seeker (starter NoBatch) params
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)
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where
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batchloop = do
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mp <- liftIO $ catchMaybeIO getLine
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case mp of
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Nothing -> return ()
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Just p -> do
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seeker (starter Batch) [p]
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batchloop
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-- bad input is indicated by an empty line in batch mode. In non batch
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-- mode, exit on bad input.
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batchBadInput :: BatchMode -> Annex ()
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batchBadInput NoBatch = liftIO exitFailure
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batchBadInput Batch = liftIO $ putStrLn ""
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