{- git-annex command queue
 -
 - Copyright 2011 Joey Hess <joey@kitenet.net>
 -
 - Licensed under the GNU GPL version 3 or higher.
 -}

module Annex.Queue (
	add,
	flush,
	flushWhenFull
) where

import Common.Annex
import Annex hiding (new)
import qualified Git.Queue
import qualified Git.Config

{- Adds a git command to the queue. -}
add :: String -> [CommandParam] -> [FilePath] -> Annex ()
add command params files = do
	q <- get
	store $ Git.Queue.add q command params files

{- Runs the queue if it is full. Should be called periodically. -}
flushWhenFull :: Annex ()
flushWhenFull = do
	q <- get
	when (Git.Queue.full q) $ flush False

{- Runs (and empties) the queue. -}
flush :: Bool -> Annex ()
flush silent = do
	q <- get
	unless (0 == Git.Queue.size q) $ do
		unless silent $
			showSideAction "Recording state in git"
		q' <- inRepo $ Git.Queue.flush q
		store q'

get :: Annex Git.Queue.Queue
get = maybe new return =<< getState repoqueue

new :: Annex Git.Queue.Queue
new = do
	q <- Git.Queue.new <$> fromRepo queuesize
	store q
	return q
	where
		queuesize r = readish =<< Git.Config.getMaybe "annex.queuesize" r

store :: Git.Queue.Queue -> Annex ()
store q = changeState $ \s -> s { repoqueue = Just q }