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|
{- git-annex command-line actions
-
- Copyright 2010-2014 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE BangPatterns #-}
module CmdLine.Action where
import Common.Annex
import qualified Annex
import Types.Command
import qualified Annex.Queue
import Annex.Exception
type CommandActionRunner = CommandStart -> CommandCleanup
{- Runs a command, starting with the check stage, and then
- the seek stage. Finishes by printing the number of commandActions that
- failed. -}
performCommandAction :: Command -> CmdParams -> Annex ()
performCommandAction Command { cmdseek = seek, cmdcheck = c, cmdname = name } params = do
mapM_ runCheck c
Annex.changeState $ \s -> s { Annex.errcounter = 0 }
seek params
showerrcount =<< Annex.getState Annex.errcounter
where
showerrcount 0 = noop
showerrcount cnt = error $ name ++ ": " ++ show cnt ++ " failed"
{- Runs one of the actions needed to perform a command.
- Individual actions can fail without stopping the whole command,
- including by throwing IO errors (but other errors terminate the whole
- command).
-
- This should only be run in the seek stage. -}
commandAction :: CommandActionRunner
commandAction a = handle =<< tryAnnexIO go
where
go = do
Annex.Queue.flushWhenFull
callCommandAction a
handle (Right True) = return True
handle (Right False) = incerr
handle (Left err) = do
showErr err
showEndFail
incerr
incerr = do
Annex.changeState $ \s ->
let ! c = Annex.errcounter s + 1
! s' = s { Annex.errcounter = c }
in s'
return False
{- Runs a single command action through the start, perform and cleanup
- stages, without catching errors. Useful if one command wants to run
- part of another command. -}
callCommandAction :: CommandActionRunner
callCommandAction = start
where
start = stage $ maybe skip perform
perform = stage $ maybe failure cleanup
cleanup = stage $ status
stage = (=<<)
skip = return True
failure = showEndFail >> return False
status r = showEndResult r >> return r
|
