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|
{- git repository command queue
-
- Copyright 2010 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module GitQueue (
Queue,
empty,
add,
run
) where
import qualified Data.Map as M
import System.IO
import System.Cmd.Utils
import Data.String.Utils
import Control.Monad (unless)
import qualified GitRepo as Git
{- An action to perform in a git repository. The file to act on
- is not included, and must be able to be appended after the params. -}
data Action = Action {
getSubcommand :: String,
getParams :: [String]
} deriving (Show, Eq, Ord)
{- A queue of actions to perform (in any order) on a git repository,
- with lists of files to perform them on. This allows coalescing
- similar git commands. -}
type Queue = M.Map Action [FilePath]
{- Constructor for empty queue. -}
empty :: Queue
empty = M.empty
{- Adds an action to a queue. -}
add :: Queue -> String -> [String] -> FilePath -> Queue
add queue subcommand params file = M.insertWith (++) action [file] queue
where
action = Action subcommand params
{- Runs a queue on a git repository. -}
run :: Git.Repo -> Queue -> IO ()
run repo queue = do
_ <- mapM (\(k, v) -> runAction repo k v) $ M.toList queue
return ()
{- Runs an Action on a list of files in a git repository.
-
- Complicated by commandline length limits. -}
runAction :: Git.Repo -> Action -> [FilePath] -> IO ()
runAction repo action files = do
unless (null files) runxargs
where
runxargs = pOpen WriteToPipe "xargs" ("-0":gitcmd) feedxargs
gitcmd = ["git"] ++ Git.gitCommandLine repo
(getSubcommand action:getParams action)
feedxargs h = hPutStr h $ join "\0" files
|
