git-annex/CmdLine/Batch.hs

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{- git-annex batch commands
-
- Copyright 2015 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU AGPL version 3 or higher.
-}
module CmdLine.Batch where
import Annex.Common
import Types.Command
import CmdLine.Action
import CmdLine.GitAnnex.Options
import Options.Applicative
import Limit
import Types.FileMatcher
data BatchMode = Batch BatchFormat | NoBatch
data BatchFormat = BatchLine | BatchNull
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parseBatchOption :: Parser BatchMode
parseBatchOption = go
<$> switch
( long "batch"
<> help "enable batch mode"
)
<*> switch
( short 'z'
<> help "null delimited batch input"
)
where
go True False = Batch BatchLine
go True True = Batch BatchNull
go False _ = NoBatch
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-- A batchable command can run in batch mode, or not.
-- In batch mode, one line at a time is read, parsed, and a reply output to
-- stdout. In non batch mode, the command's parameters are parsed and
-- a reply output for each.
batchable :: (opts -> String -> Annex Bool) -> Parser opts -> CmdParamsDesc -> CommandParser
batchable handler parser paramdesc = batchseeker <$> batchparser
where
batchparser = (,,)
<$> parser
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<*> parseBatchOption
<*> cmdParams paramdesc
batchseeker (opts, NoBatch, params) =
mapM_ (go NoBatch opts) params
batchseeker (opts, batchmode@(Batch fmt), _) =
batchInput fmt Right (go batchmode 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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-- Reads lines of batch mode input and passes to the action to handle.
batchInput :: BatchFormat -> (String -> Either String a) -> (a -> Annex ()) -> Annex ()
batchInput fmt parser a = go =<< batchLines fmt
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where
go [] = return ()
go (l:rest) = do
either parseerr a (parser l)
go rest
parseerr s = giveup $ "Batch input parse failure: " ++ s
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batchLines :: BatchFormat -> Annex [String]
batchLines fmt = liftIO $ splitter <$> getContents
where
splitter = case fmt of
BatchLine -> lines
BatchNull -> splitc '\0'
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-- Runs a CommandStart in batch mode.
--
-- The batch mode user expects to read a line of output, and it's up to the
-- CommandStart to generate that output as it succeeds or fails to do its
-- job. However, if it stops without doing anything, it won't generate
-- any output, so in that case, batchBadInput is used to provide the caller
-- with an empty line.
batchCommandAction :: CommandStart -> Annex ()
batchCommandAction a = maybe (batchBadInput (Batch BatchLine)) (const noop)
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=<< callCommandAction' a
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-- Reads lines of batch input and passes the filepaths to a CommandStart
-- to handle them.
--
-- File matching options are not checked.
batchStart :: BatchFormat -> (String -> CommandStart) -> Annex ()
batchStart fmt a = batchInput fmt Right $ batchCommandAction . a
-- Like batchStart, but checks the file matching options
-- and skips non-matching files.
batchFilesMatching :: BatchFormat -> (FilePath -> CommandStart) -> Annex ()
batchFilesMatching fmt a = do
matcher <- getMatcher
batchStart fmt $ \f ->
ifM (matcher $ MatchingFile $ FileInfo f f)
( a f
, return Nothing
)