76 lines
2.4 KiB
Haskell
76 lines
2.4 KiB
Haskell
{- 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 Annex.Common
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import Types.Command
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import CmdLine.Action
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import CmdLine.GitAnnex.Options
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import Options.Applicative
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data BatchMode = Batch | NoBatch
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parseBatchOption :: Parser BatchMode
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parseBatchOption = flag NoBatch Batch
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( long "batch"
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<> help "enable batch mode"
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)
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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 :: (opts -> String -> Annex Bool) -> Parser opts -> CmdParamsDesc -> CommandParser
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batchable handler parser paramdesc = batchseeker <$> batchparser
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where
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batchparser = (,,)
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<$> parser
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<*> parseBatchOption
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<*> cmdParams paramdesc
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batchseeker (opts, NoBatch, params) = mapM_ (go NoBatch opts) params
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batchseeker (opts, Batch, _) = batchInput Right (go Batch opts)
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go batchmode opts p =
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unlessM (handler opts p) $
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batchBadInput batchmode
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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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-- Reads lines of batch mode input and passes to the action to handle.
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batchInput :: (String -> Either String a) -> (a -> Annex ()) -> Annex ()
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batchInput parser a = go =<< batchLines
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where
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go [] = return ()
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go (l:rest) = do
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either parseerr a (parser l)
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go rest
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parseerr s = giveup $ "Batch input parse failure: " ++ s
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batchLines :: Annex [String]
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batchLines = liftIO $ lines <$> getContents
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-- Runs a CommandStart in batch mode.
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--
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-- The batch mode user expects to read a line of output, and it's up to the
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-- CommandStart to generate that output as it succeeds or fails to do its
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-- job. However, if it stops without doing anything, it won't generate
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-- any output, so in that case, batchBadInput is used to provide the caller
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-- with an empty line.
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batchCommandAction :: CommandStart -> Annex ()
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batchCommandAction a = maybe (batchBadInput Batch) (const noop)
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=<< callCommandAction' a
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-- Reads lines of batch input and passes the filepaths to a CommandStart
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-- to handle them.
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batchFiles :: (FilePath -> CommandStart) -> Annex ()
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batchFiles a = batchInput Right $ batchCommandAction . a
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